TWI379561B - A method to adjust ofdm-symbol window functions and a windowing apparatus to use this method - Google Patents

Description

AFA-P06001 21493 twf.doc/n IX. Description of the Invention: [Technical Field] The present invention relates to a frame technique, and more particularly to a method and apparatus for adjusting a frame function. [Prior Art] In recent years, due to the development of information technology, communication technology has also developed rapidly. In various communication technologies, Orthogonal Frequency is used in particular for parallel transmission using multiple sub-carriers. The -Division Multiplexing (OFDM) technology is most favored, and in the case where orthogonality is maintained for each subcarrier, the spectrum of a plurality of subcarriers is allowed to overlap, and interference between carriers can be avoided. In most applications, a guard interval is inserted in front of each symbol to prevent interference between 〇fdM symbols (Inter-Symbol

Interference, ISI) ’ Also, a cyclic prefix signal is placed in the guard interval (GI), that is, the signal in the original symbol is repeated. In the orthogonal frequency division multiplexing system, the received signal at the receiving end will be distinguished from each 〇fdM symbol by the symbol length L in the time domain to perform signal processing at the rear end and restore the original data. For the OFDM symbol added to a loop preamble, as long as the signal of the extracted signal is between the guard interval plus the symbol length (GI+L), the signal of any symbol length L is regarded as good. Symbol timing (Symb〇itiming). 1379561 AFA-P06001 21493twf.doc/n In a multipath path environment, the signal transmitted by the transmitting end may arrive at the receiving end via a different path, and the receiving end receives at different times due to the different time of reaching the receiving end. More than two identical signals. Taking FIG. 1 as an example (FIG. 1 is a schematic diagram of receiving signals in a channel environment of multiple paths), the received signal at the receiving end is a composite of receiving two identical signals (signal 110 and signal 120) at different times. letter

The number is assumed to be the time Tch at which the signal 110 differs from the signal 120 when it is received. Taking the intermediate OFDM symbol in FIG. 1 as an example, as long as it is within the effective acquisition interval Tav, a segment of the symbol whose length is L is taken as a good symbol timing, that is, effective. Take the signal taken out in the interval, and it will contain any signal in the preceding and succeeding symbols, so there will be no interference between the symbols.

In the current technology, the receiving end often uses a boxing function to retrieve an otDM symbol from the receiving k number. For example, the received signal (the composite signal of No. 1 and No. 120) is multiplied by a frame of 13 〇, and 3 = OFDM symbols between t are taken. The _ _ 2 of the receiving end is used to manipulate the signal, and the bandwidth of the received signal on the frequency can be adjusted and the energy of the received signal on the sideiQbe can be reduced to reduce the received signal. The (4) tender fe_, Cong) received in the channel, and the smaller the slope of =\=1 and falling in the boxing function, will be able to reduce the narrow-band interference received in the channel. ..., and 'in the actual transmission, the impulse response of the channel changes with time 1379561 A^A-POSOOl 2l493twf.doc/n

It is not possible to effectively reduce the narrow band interference of the received signal in the channel.

The channel length Tch also changes with time, so that the effective capture interval Tav (shown in Figure 1) that each symbol can take will become longer or shorter over time. However, since the current receiving end uses a fixed boxing function, and when the channel length is too large, the effective capturing interval Tav (as shown in FIG. 1) becomes too short, the 'fixed framed function may be extracted before and after the inclusion. The signal of the symbol, which causes interference between the symbols. Or, when the effective operation interval Tav (as shown in FIG. 1) is long, the receiving end still uses a fixed boxing function, so the currently used boxing functions are, for example, a ladder boxing function and a Mw boxing function (by The boxing function proposed by Stefan H. Muller-Weinfurtner) and the Hanning windw function, etc., and the above-mentioned boxing function is shown in Fig. 2. The abscissa in Fig. 2 is the sampling time, vertical The seat ^ is the size of the coefficient. It can be observed from Fig. 2 that the above-mentioned framed function has a coefficient of 1 in the sampling time, and both sides have a section of the edge, and the spectrum of the received signal is adjusted, and the edge is symmetric. When the receiving end uses the above-mentioned boxing function, it is necessary to store the above-mentioned boxing function in advance, and the receiving % must store the coefficient size of the boxing function at each sampling time. Since the middle of the framing function is 丨, the receiver only needs to store the coefficients in the rim at each sampling time. However, the number of interleaving intervals corresponding to the edge of the framing function used by the receiving end is usually about (10). Therefore, the receiving end still needs to reproduce the coefficients in about 100 rims. And when =, the more sampling time points corresponding to the rolling edge of the boxing function, the larger the memory is needed at the receiving end to the coefficients in the piping. 1379561 AFA-P06001 21493twf.doc/n is currently published in the US US2004022175, US53575〇2, EU public patent EP1043875 and Institute of Electrical and Electronics Engineers (pressure

The Institute of Electrical and Electronic Engineers' Transactions on Communications (as described in [l] below) has revealed various framed techniques. However, the above patents and papers do not mention effective capture. When the interval Tav changes, how to adjust the framing function to prevent the interference between the symbols and effectively slow down the narrow band interference, and the above-mentioned patents and the proposed framed function in the paper still need to cost a lot at the receiving end. The memory stores the coefficients of the boxing function at each sampling time. [1] DS Muller-Weinfurtner, 'Optimum Nyquist windowing in OFDM receivers, IEEE Trans, on Communications, vol. 49, no. 3, pp. 417-420, 2001 SUMMARY OF THE INVENTION The object of the present invention is to provide an adjustment The method of boxing function is used to adjust the edge of the framed function according to the difference between the channel length and the guard interval to prevent inter-symbol interference and reduce the narrow-band interference. It is still another object of the present invention to provide a framing apparatus that utilizes a complementary lift to create a plurality of shirring coefficients to save memory in the device. The present invention provides a method for adjusting a framed function, including: detecting a channel length, finding a difference between a channel length and a guard interval, and adjusting a edge of the frame function by using a difference value. The present invention further provides a framer device for performing a frame operation on a 13759621 AFA-P06001 21493 twf.doc/n received signal by using a frame function, the framed function having a first side frame factor and a second side The framed coefficient, and the frame factor of the first side and the frame factor of the second side each include a plurality of first half frameization coefficients and a plurality of second half frameization coefficients. The framer includes a frame factor storage unit, a roll amplitude generation unit, and a frame operation unit. The boxing coefficient storage unit 7G stores the first half of the frame factor of the first side frame factor. The edge amplitude generating unit performs a complementary operation by the first half framering coefficient to generate a second half framering coefficient of the frame coding coefficient of the first side and a frame factor of the second side. The framed operation unit frames the received signal by using the second half of the frame factor of the first side frame factor and the frame factor generated by the edge amplitude generating unit. The invention adjusts the edge of the boxing function according to the difference between the channel length and the guard interval. When the length of the channel is so long that the difference is small, the length of the edge is reduced to avoid capturing adjacent symbols. When the length of the channel is short so that the above difference is large, the length of the edge is amplified to effectively reduce the narrow band interference of the received signal. Therefore, the present invention can prevent inter-symbol interference. Further, when the present invention is applied to a multi-carrier system, for example, an orthogonal frequency division multiplexing system, the present invention can more effectively avoid Inter-Carrier Interference (ICI). The above and other objects, features, and advantages of the present invention will become more apparent <RTIgt; </ RTI> <RTIgt; </ RTI> <RTIgt; [Embodiment] In the prior art, the receiving end uses a fixed framed function to frame the received signal, but in actual application, due to the change of the channel length, the fixed framed function may cause inter-symbol Interference, or can not effectively slow down the narrow-band interference in the channel. "And the receiving end needs to store the framed function in advance to frame the received signal. Therefore, when the hardware is implemented, the receiving end must reserve a large amount of b memory to store. Boxing factor. Therefore, the present invention proposes a method and a framer for adjusting a frame function to adjust the frame function in a timely manner and reduce the memory required for the receiving end to store the frame factor. The first embodiment of the present invention will be described below to explain the framed device of the present invention. Before explaining this embodiment, it is assumed that the frame function used in this embodiment is a trapezoidal frame function. FIG. 3 illustrates a block function of an embodiment of the present invention. Referring to Figure 3, the abscissa is labeled as the sampling time n, and its ordinate is labeled as the frame factor. Here, a roll length is defined, which is the sampling time length corresponding to the edge of the boxing function and is expressed as κ, and in the example of Fig. 3, the 'roll length Κ=8. Further, assuming that the symbol length of the received signal to be framed is L, the total length of the framing function is K + L. The edge of the boxing function in Figure 3 is a linear function, and this boxing function has left and right _. The boxing function of Figure 3 is as follows: Heart [«] = (i)

C, K&lt;.n&lt;,L RK[K+L-ri\, L + \&lt;n&lt;,L+K~\ 〇&gt; In the above other formula (l), c is a constant and its value For 1, AM is the "T boxing factor at the time of sampling. In order to facilitate (4) the following, in Figure 3, the boxing factor is *3 (H, w = 2 corresponds to the boxing system, and so on.) The boxing factor is marked as the median number in Figure 3. AFA-P06001 21493 twf.doc/n 301~314. In the framed device proposed by the embodiment of the present invention, only the values of the four framed coefficients are stored, and all the values of the framed coefficients 301 to 314 can be obtained. And the signal is framed. However, in the conventional frame technique, it is necessary to store 14 frame coefficients to be able to perform the frame operation. In the following paragraphs, the description will be given. In order to facilitate the description of the embodiments of the present invention, the values of each of the frame factors 301-314 in FIG. 3 are defined in advance, wherein the values of the frame factors 301 307 to 307 on the left side are sequentially The values of the frame factors 308 to 314 on the right side are 0.875, 0.75, 0.625, 0.55, 0.375, 0.25, and 0.125, respectively. In the embodiment of the invention, the boxing coefficients 3〇1 to 307 on the left side are defined as two groups' The frame factors 301 to 303 are defined as the left half frame factor and the frame coefficients 304 to 307 are defined as the right half frame coefficients; likewise, the frame coefficients 3 〇 8 314 to the right are defined as the left half frame. Figure 4 is a block diagram of a framed device according to a first embodiment of the present invention. Please refer to Figure 4 'herein' assuming that the framer 400 is included in a receiving Furthermore, it is assumed that the receiving end is applied to the OFDM system, and the received signal from the channel contains a plurality of OFDM symbols, and includes a guard interval in each symbol and a loop preamble in the guard interval. The original symbol length of the unprotected interval is L, that is, the actual length of the original symbol is L unit sampling time. In addition, the receiving end samples the received signal and generates a sampling signal S[n] to the frame. The device 400 is assembled, and the framed device 1379561 AFA-P06001 21493 twf.doc/n 400 will frame the sampled signal s[n] to extract each 〇1; 1) 1^ symbol.

The framing device 400 of FIG. 4 includes a framing coefficient storage unit 41, a roll amplitude generating unit 420, and a framing operation unit 43A, wherein the rim amplitude generating unit 420 includes a first adding unit 422 and a multiplex unit 425. The frame division unit 430 includes a multiplication unit 432, a second addition unit 434, a buffer unit 436, and a third addition unit 438. The frame factor storage unit 410 stores only four frame coefficients 304 to 3〇7. In the following, it is explained how the framer 400 refers to the frame signal s[n] being framed by the four frame coefficients 304 to 307 stored by the frame factor storage unit 41. First, the edge amplitude generating unit 420 sequentially takes out a specific frame factor ～ ～ by a plurality of framing coefficients 304 to 307. Where, with the boxing function (2) 〇 ice H, χΛη] = &lt; wkW,

One κ 1 τι one —l· 1 〜 2

Next, the first adding unit in the edge amplitude generating unit 420 subtracts ~[«] from a constant C, and outputs a difference heart w = c1. In the present embodiment, the constant 匸 is, for example, the multiplexer 425 is coupled to the first adding unit 422 and the framing coefficient storage unit 410, and receives the framing coefficient storage unit 41. 〜 output (4) and X, [η] output by the addition unit 422, and the multiplex unit 425 selects the output 4[«] or the 依据 according to a selection signal at each sampling time w as the "sampling" The roll amplitude coefficient of time is asked. Here, it is assumed that the framing device 400 first frames the sampling time "1 1 sample 1 1379561 AFA-P06001 21493 twf.doc/n signal S[l]", that is, it is necessary to generate a frame factor of 3 并As described in the above (2), ~[1]=~[7] = 0.125, that is, when W = 1, the 'rolling edge amplitude generating unit 420 reads out the frame factor 3〇7. Further, since the value of the framing coefficient 301 is different from the framing coefficient 3 〇 7 and 丨, the multiplex unit 425 is selected as the rim amplitude, and the value of the rim amplitude z/cW is 0.875. In this embodiment, the selection signal received by the multiplexing unit 425 can be, for example, 0 or 1. When the edge amplitude to be generated is the left half frame factor (301 to 303 and 308 to 310), the selection signal will be 〇. And the multiplex unit 425 outputs the difference ruler from the first addition unit 422 to the frame division operation unit 430, and the roll edge amplitude to be generated is the right half frameization coefficient (304 to 307 and 311 to 314). At this time, the selection signal is 丨' and the multiplex unit 425 directly outputs the specific framed coefficient read by the framing coefficient storage unit 41 to the framing operation unit 430. However, those skilled in the art should be able to infer that the selection signal can be generated by using a counter to count the number of edge amplitudes or sampling times output by the multiplexing unit 425, etc., to determine whether the selection signal is 0 or 1. Next, the frame operation unit 430 receives the sampling signal s[i] of the sampling time „=1, and simultaneously inputs it to the multiplication unit 432 and the second addition unit 434. Then, the multiplication unit 432 compares the sampling signal s(1) with the edge amplitude. After multiplying the edge amplitude zJ1] outputted by the = element 420, the product 々[fxstiHKwssn] is outputted to the second adding unit 434. Next, the second adding unit 434 outputs the sampling signal S[1] and the output of the multiplying unit 432. After the 875S[l] is subtracted, the output difference 〇1258[1] is output and stored to the buffer 12 1379561 AFA-P06001 21493 twf.doc/n punch unit 436. After that, after the same hardware operation, the edge amplitude The generating unit 420 will sequentially read the framed coefficients 305 and 306 stored in the framed coefficient storage unit 41, and sequentially generate the edge amplitude ζ [[2] = 〇·75 and Zj3] = 〇·625 ' After the operation of the framing operation unit 430, the memory 〇.25S[2] and 0.375S[3] are stored in the buffer unit 436. Next, the framing device 400 is required to sample the sampling time n=4. When S[4] performs an operation, the edge amplitude generating unit 420 reads the framed memory unit 4 The frame factor 304 in 10 has a value of 〇 5. Since the frame factor 304 required at this time is the right half frame coefficient, the selection signal at this time is 1, and the multiplex unit 425 directly outputs the The specific frame factor to read from [4] to the frame operation unit 43A is used as the sampling time "edge amplitude ~ [4]. &lt; The frame operation unit 430 receives the sampling signal S[4] ' whose sampling time is "=4". The internal multiplication unit 432 multiplies the sampling signal s(4) by the edge amplitude ～[4] outputted by the rimming unit 420, and outputs •=[4]xS[4H). It is immediately after the second adding unit 434, and then The second adding unit 434 subtracts the sample &lt;5 S[4] from the output 〇.5S[4] of the multiplying unit 432, and outputs 〇.5S[4] and stores it in the buffer unit 436. Then, according to the same hardware operation, the edge amplitude generating unit sample frame coefficient storage unit 410 reads out the frame factor 305~307' and then passes through the framed operation unit gamma internal 0.7· with the coffee [7], and Save to the buffer unit. Next, since the sampling signal S[8], S[9], ..., S[L] corresponds to 13 1379561 AFA-P06001 21493twf.doc/n, the frame factor is 1 ', therefore, the sampling signal S[8 ], S[9:|, , S[L:| will be directly input to the backend processing, and is not input to the framing device 400. Thereafter, since the sampling signals S[L+1] to S[L+7] are to be operated via the framing device 400, the edge amplitude generating unit 420 will continue to read the framing coefficients in the framing coefficient storage unit 410. Here, it is assumed that the framing device 400 first operates on the sampling signal s[L+l], and thus it is necessary to generate the frame factor 308. Since the value of the framing coefficient 308 is the same as the value of the framing coefficient 301, and is the difference between the framing coefficients 307 and 1. Therefore, the specific frame factor xJZ + 1] read by the edge amplitude generating unit 420 is a frame factor of 3〇7, and its value is 0.125. Next, the adding unit 422 calculates the difference between the specific frame factor 々[1 + 1] and 1 and outputs the difference 4 [especially + 1] to the multiplex unit 425, which has a value of 0.875. Since the framed coefficient 308 that needs to be generated by the edge amplitude generating unit 420 is the left half edge amplitude, after the selection signal is 〇^, the multiplex unit 425 will use the difference value x'JL + 1] as the edge amplitude according to the selection signal. ~[[+ 1], and output to the frame operation unit 430. The multiplication unit 432 in the frame operation unit 430 will receive the sampling signal S[L+1] ' and multiply the edge amplitude zJZ + Ι] by the sampling signal S[L+1], and then multiply the product ^[1 + 1] The parent 8[1&gt;1]=0.8758[1^1] is output to the third addition unit 438. Since the 前fdM symbol to be framed by the framing device 400 includes a cyclic preamble signal, it can be inferred that the sampling signals S[l]~S[7] are the same as the sampling signals S[L+1]~S[L+7]. Repeat signal. Therefore, the framing device 4 〇〇 will use the sampling signals S[l]~S[7] and the sampling signals s[L+l]~S[L+7] to be the same 14 ί S &gt; 1379561 AFA-P06001 21493twf. The characteristics of the doc/n signal to restore the original signal. Therefore, after the second adding unit 438 receives 0.875S [L+1] rotated by the multiplying unit 432, the third adding unit 438 will read out the 〇.125S[1] previously stored in the buffer unit 436, and Add 〇8758[]1+1] to 0.125S[1] and output it to the backend processing to let the device at the back end restore the original signal. Then, according to the same hardware operation, the framing device 4 利用 will use the framing coefficients 3 〇 6 and 3 〇 5 stored in the framing coefficient storage unit 410 to sequentially generate the rim amplitude ~ [^ + 2] and 2^[+3], the values are 〇75 and 0.625, respectively, and then 〇.75S[L+2] is added to 〇.25S[2] and 〇.625S[L] previously stored in buffer unit 436. +3] is added to the backend processing after the 〇.375S[3] previously stored in the buffer unit 436. As is apparent from the above operation of the frame operation unit 43, the multiplication unit 432 in the frame division unit 430 outputs the product of the sample signal and the edge amplitude to the second addition unit 434 at the sampling time «17. At the sampling time " = 1 + 1 to Z + 7, the multiplication unit 432 in the frame operation unit 43A outputs the product of the sampling signal and the edge amplitude to the third addition unit 438. Therefore, those skilled in the art should be able to infer that the multiplication unit 432 may further include a multiplexer or switcher or the like to determine the product of the sampling signal and the edge amplitude to be rotated to the second adding unit 434 and the third adding unit 438. one of them. Next, the framing device 400 is to calculate the sampling signal S[L+4], and at this time, it is necessary to generate the framing coefficient 311, and the value of the framing coefficient 311 is the same as the value of the framing coefficient, therefore, the edge amplitude The generating unit 42〇15 1379561 AFA-P06001 21493twf.doc/n will read out the boxing coefficient 304 and as a specific boxing coefficient meaning [I + 4] • The boxing coefficient 307 has a value of 〇.5. Since the required frame factor ^&quot;^ is the right half frame factor, the selection signal is 丨, and the multiplex unit

425 directly reads ~[1 + 4] as the edge amplitude ~ [1 + 4] 轸 ^ to the frame operation unit 430. S, the frame operation unit 430 receives the sample signal s[L+4], and the multiplication unit το 432 sets the sample signal S[L+4] and the edge amplitude of the φ output of the edge amplitude generation unit 42 [, [L + 4] After multiplication, the product z/f[Z + 4]xS[L+1]= 〇5S[L+4] is output to the third addition unit. After the third addition unit 438 receives 0.5S[L+4] output by the multiplication unit 432, the third addition unit 438 will read out the 〇.5S[4] ' previously stored in the buffer unit 436 and will 〇. 5S[L+4] is added to 〇.5S[4] and output to the back-end processing to let the device at the back end restore the original signal. Then, according to the same hardware operation, the framing device 400 will sequentially generate the rim amplitudes [[Z + 5], 々 [1 +] by using the framing coefficients 305, 306, and 307 stored in the framing coefficient storage unit 410. 6] and 々[Z + 7], the values are 0.375, 0.25 and 0.125, respectively, and then 〇.375S[L+5] is added to 0.625S[5] previously stored in buffer unit 436, 0.25 S[L+6] is added to 0.75S6] previously stored in buffer unit 436 and 0.125S[L+7] is added to 〇.875S[7] previously stored in buffer unit 436, and output to the back end processing. In order to restore the original signal to the device at the back end. From the above description of the operation of the framing device 400 in Fig. 4, a method step can be summarized, as shown in Fig. 5. FIG. 5 is a flow chart showing the steps of the method of framing according to the first embodiment of the present invention. Referring to FIG. 4 and FIG. 5 simultaneously, the first 16 1379561 AFA-P06001 21493 twf.doc/n first 'roll edge amplitude generating unit 420 sequentially reads the framed coefficients in the framing coefficient storage unit 410 (step S510). Thereafter, the edge amplitude generating unit 420 calculates the difference between the read frame factor and i (step S52A). The multiplex unit 425 selects one of the difference values or the read frame factor as a used edge amplitude by a selection signal, and outputs it to the frame operation unit 430 (step S530).

Next, the frame operation unit 430 receives the sampling signal (step S540). The multiplying unit 432 multiplies the sampling signal by the edge amplitude from the multiplex unit 425, and then multiplies a product (step S55). Then, based on the sampling time, the multiplying unit 432 determines the product output to the second adding unit 434.

One of the second addition units 438, that is, the edge amplitude from the roll amplitude generating unit 420 at this time is determined to be the framed coefficient corresponding to the left side, and is the frame factor of the right side (step S56). If the edge amplitude from the edge amplitude generating unit 420 corresponds to the frame factor of the left side, the multiplication unit 432 outputs the product to the second adding unit 434' and subtracts the received product from the sampled signal via the adding unit 434. It is then stored in the buffer unit 436 (step S565). The edge amplitude of the wire from the edge amplitude generating unit 42 is corresponding to the framed Wei on the right side, and the job unit 432 sends it out to the third adding unit 438' to multiply the received one via the adding unit 438. After the corresponding product, the following is the method and device for adjusting the surface of the present invention. The method and apparatus for adjusting the surface of the present invention are shown in Fig. 6 Blocking device block diagram. Referring to FIG. 6, the adjustment frame is set to 1379561 AFA-P06001 21493 twf.doc/n 600 includes a framed coefficient storage unit 610, a roll edge amplitude generating unit 620, and a framed operation unit 630. 630 further includes a multiplication unit 632, a buffer unit 636, and an addition unit 638. Before the present embodiment is described, it is assumed that the present embodiment uses the frame function in Fig. 3. For the convenience of the embodiment of the present invention, the frame factor on the left side is used. The values of 301 to 307 are sequentially defined as 0.125, 0.25, 0.375, 0.5, 0.625, 0.75, and 0.875, and the values of the frame factors 308 to 314 on the right side are sequentially defined as 0.875, 0.75, 0.625, 0.5, 0.375, 0.25. With 0.125. And, assuming boxing The number storage unit 61 储存 stores the frame factor in FIG. 3 as 301 to 307 ′ and the edge amplitude generation unit 620 can adjust the frame of the frame function by using the frame coefficients 301 to 307. Next, it is assumed that the frame is adjusted. The device 600 is included at a receiving end, and the receiving end has a channel estimation module (not shown), and the channel estimation module estimates the channel impulse response by using the received signal from the channel. The channel impulse response calculates the channel length. Furthermore, it is assumed that the reception is applied to the OFDM system, and the received signal from the channel_ contains a plurality of OFDM symbols, and includes a guard interval in each symbol and the guard interval is The preamble signal is looped, and the original unpaid length of the unprotected interval is L, that is, the actual length of the original symbol is the unit sampling time. The relationship between the channel length and the guard interval is as shown in Fig. 1. After the receiving end samples the received signal, the sampling signal S[n] is input to the adjusting frame device 6〇0, and the framed agricultural device 6〇〇 is utilized by the channel estimating module. Calculate the length of the channel, and trim the adjustment frame 18 AFA-P06001 21493twf.doc/n function, and frame the sampled signal S[n] to correctly extract each OFDM symbol, and valid To prevent narrowband interference in the channel. Referring to Figures 3 and 6, the starting edge amplitude generating unit 620 receives a channel length, which is provided, for example, by the channel estimation module in the receiving end. After the channel length, the edge amplitude generating unit 620 will find the difference between the channel length and the guard interval, for example, the length of the guard interval minus the channel length. It can be observed from the above FIG. 1 that when the difference between the guard interval and the channel length becomes larger, the effective capture interval Tav in FIG. 1 will also become longer; otherwise, when the difference between the guard interval and the channel length When it becomes smaller, the effective operation interval Tav in Fig. 1 will also become shorter. Therefore, next, the edge amplitude generating unit 620 determines a down-sampling factor based on the difference between the protected area and the channel length, and indicates that it is a roll to adjust the frame function. For example, when the difference between the guard interval and the channel length is reduced, the edge amplitude generating unit 620 increases the downsampling factor £ to shorten the edge length K of the boxing function and prevent the edge of the boxing function from being rolled. Capture to the adjacent symbol. Here, for convenience of explanation of the present embodiment, it is assumed that the piping amplitude generating unit 620 determines the downsampling factor £&gt;=2. After the roll amplitude generating unit 620 decides to reduce the sampling factor Z), the sampling factor Z) is reduced at each interval, and the corresponding frame factor is excluded. Here, since the downsampling factor £)=2, the edge amplitude generating unit 620 will exclude the frame factor, 303, 305, 307, 308, 310, 312, and 314 in the edge amplitude generating unit ο. The amplitude generating unit 620 uses the remaining framing coefficients 302, 304, 306, 309, 311, and 313' as an adjustment frame function to adjust the edge slope and length, wherein the remaining edge amplitudes are 3〇2, 3〇4 The values of 306 and 306 are respectively 0.25, 0.5 and 0.75. The remaining framed coefficients can form an adjustment frame function, as shown in Fig. 7. Fig. 7 shows an adjustment frame function according to an embodiment of the present invention. Figure 7, the abscissa is the sampling time w, and its ordinate is the boxing coefficient. The values of the boxing coefficients 7〇1' 702 and 703 on the left side in Fig. 7 are the frame factors 302, 304 and The values of the boxing coefficients 704, 705, and 706 on the right side of 306' are the frame factors 309, 311, and 313 in Fig. 3, respectively, and the length of the piping in Fig. 7 is t = 4, and the length of the symbol is L and is in Fig. 3. The symbol length is the same, so the total length of the adjustment box function is K, + L 调整 the adjustment box function in Figure 7 The rolling edge is a linear function, and the adjustment boxing function has the characteristics of left-right symmetry. However, the formula (1) of the boxing function in FIG. 3 can introduce a general formula of the adjustment boxing function in FIG. And expressed as follows: 'RK[Dn], \&lt;,n^K/D-\

1, KIO&lt;.n&lt;,L wjc/i&gt;L«]=· L+\^n&lt;,L+M)-\ (3) .〇, in the above other formula (3), ΑπΜ is the first sampling The boxing factor of time. Next, please refer to FIG. 3, FIG. 6 and FIG. 7, at the same time, after the partial framing coefficient is excluded, the 'rolling edge generation unit 620 will generate the edge amplitude ~AD[W] using the remaining frame two coefficients, and output to the frame. The arithmetic unit 630. In the present embodiment, due to the reduction of the sampling factor ιχ, the roll amplitude is expressed as: 1379561 AFA-P06001 21493twf.doc/n. It is assumed here that the framing device 600 first frames the sampling signal S[l] of the sampling time "=1". Therefore, the edge amplitude generating unit 620 reads the remaining framing coefficient 302 from the framing coefficient storage unit 410 as The edge vibration 1)3⁄4 z/:/2[l] is output to the frame operation unit 630, that is, the frame factor 701 in FIG. 7 is output as the edge amplitude to the frame operation unit 630, wherein the edge is rolled. Amplitude\/2[η

The value is 0.25. The framed transport unit 630 will also receive the squirrel s[l] and input it to the multiplying unit 632. 'σ A Then, the multiplication unit 632 multiplies the sampling signal s[l] by the edge amplitude ~&quot;[I] output by the edge amplitude generating unit 620, and outputs the product ~2[l]xS[l]=0.25S [l] 'Save the product 0.25S[1] to the buffer unit 636. Thereafter, according to the same hardware operation, the edge amplitude generating unit 62 sequentially outputs the remaining frame coefficients 304 and 3〇6 as the edge amplitude, and passes through the multiplying unit 632 and the sampling signals $(2) and S[3], respectively. After multiplication, the product 〇58[2] and 〇75S[3] are stored to the buffer 636. Next, since the framed coefficients corresponding to the sampling signals s[4], s[5], ..., S[L] are 1, the sampling signals S(4), s[5], and s[L] will be directly input. To the backend processing, it is not input to the adjustment frame 600. Next, the edge amplitude generating unit 62 读取 reads out the remaining frame factor 306 as the edge amplitude z&JL + i], and outputs it to the frame operation unit 630, where the edge amplitude z 2 2 [£ + 1] The value is 〇. The frame operation 21 1379561 AFA-P06001 21493 twf.doc/n unit 630 will also receive the sampling signal S[L+1] and input it to the multiplication unit 632. Then, the multiplication unit 632 multiplies the sampling signal S[L+1] by the edge amplitude + output by the edge amplitude generating unit 620, and outputs the product ~/2[l+i]xS[l+1]=:〇75S [L+1] to the addition unit (10). Since the OFDM symbol to be framed by the apparatus 800 for adjusting the frame includes the cyclic preamble, it can be inferred that the sampling signal sphsp] is a repetitive signal of the same sampling signal S[L+1, S[L+3]. Therefore, the apparatus for adjusting the frame 600 will restore the original signal by using the sampling signals S[1]~s[3] and the sampling signals s[l+1]~s[l+3] as the characteristics of the same signal. Therefore, after the addition unit 638 receives the 〇.75S[L+l] output by the multiplication unit 632, the addition unit 638 will read out the 0.25S[1] previously stored in the buffer unit 636, and the 〇.75S [L+l] is added to 〇.25S[l] and output to the backend processing to let the device at the back end restore the original signal. According to the same hardware operation as described above, the edge amplitude generating unit 62 作为 takes the remaining frame coefficients 304 and 302 as the edge amplitudes 々/2 [Z + 2] and +, respectively, and sequentially rotates to the frame operation unit. After multiplying the edge amplitude 々/2[£ + 2] and ~/2[1 + 3] by the sampling signal S[2] and S[3] by multiplication 632, the product 〇.5S[L+2 ] and 〇 2 although +3] are output to the addition unit 638. Then, the 〇5S[L+2] is added to the 〇.5S[2] of the buffer unit 636 by the addition unit 638, and then output to the back end processing, and 〇.25S[L+3] is added before Stored in the buffer unit 636 after the 〇 75 'output to the back end processing. Then, when the channel amplitude generating unit 62 receives the channel length provided by the channel estimation module 22 1379561 ΑΡΑ-ΡΟβοοι 21493twf.doc/n, the sampling factor is determined according to the difference between the guard interval and the channel length. To adjust the edge of the boxing function. For example, when the difference between the guard interval and the channel length is small, the edge amplitude generating unit 620 can use the downsampling factor Z)=1, that is, the framed device 600 directly uses the frame function of FIG. To frame the sampling function s[n]. When the difference between the interval and the channel length becomes larger, the edge amplitude generating unit 620 can use the reduced sampling factor £>=2 to reduce the sampling. (d〇Wn_sam) The frame function of FIG. And rotating the remaining framed coefficients' and letting the framed device 600 frame the sampling function S[n] using the boxing function in FIG. According to this mode, timely adjustment of the edge of the framed function will avoid interference between symbols when the signal on the symbol is captured, and can also effectively reduce the narrowband interference of the received signal in the channel. From the operational description of the apparatus 600 for adjusting the frame in Fig. 6, a method step can be summarized, as shown in Fig. 8. FIG. 8 is a flow chart showing the steps of the method for adjusting the frame according to the second embodiment of the present invention. Referring to FIG. 6 and FIG. 8, at the same time, first, the edge amplitude generating unit 620 receives a channel length (step S810). Next, the edge amplitude generating unit 62 finds the difference of the channel length fish protection section (step S815), and determines a downsampling factor (S820). Thereafter, the edge amplitude generating unit 62 reduces the sampling factor D at each interval, excludes the corresponding frame factor (step S825), and generates the edge amplitude by using the remaining frame factor, and sequentially outputs the result to the frame operation unit 630 (step S830) 'To adjust the framed roll. Next, the frame operation unit 630 receives the sampling signal (step 23 1379561 AFA-P06001 21493 twf.doc/n S840). Then, the multiplying unit 632 multiplies the sampling signal by the amplitude of the wave edge from the edge amplitude generating unit 620, and outputs a product (step S850). According to the sampling time, the multiplication unit 632 determines that the product is rotated out to one of the buffer unit 636 and the addition unit 638, that is, whether the edge amplitude from the edge amplitude generating unit 620 corresponds to the frame factor of the left side or the right side. The frame factor (step S86〇p) if the edge amplitude from the edge ringer w generating unit 620 corresponds to the frame factor on the left side, the multiplication unit 632 outputs the product and stores it in the buffer unit 636 (step S870). If the edge amplitude from the edge amplitude generating unit 62A corresponds to the frame factor on the right side, the multiplication unit 632 adds the product to the product corresponding to the buffer unit 636 and then rotates (step S880). A third embodiment of the present invention is provided to illustrate a framed device according to an embodiment of the present invention. The framed device of the present embodiment can simultaneously use the framed coefficient and have an adjustment frame. Figure 9 is a block diagram of a framed device according to a third embodiment of the present invention. Referring to Figure 9, the frame device 900 includes a frame factor storage unit 910, The edge amplitude generating unit 920 and the boxing operation unit 930. The 'rolling edge amplitude generating element 920 includes a first adding unit 922 and an multiplex unit 925. The framed operation unit 930 includes a multiplying unit 932 and a first adding unit 934. The buffer unit 936 and the third adding unit 938. Before explaining the present embodiment, in order to facilitate the description of the embodiment of the present invention, it is assumed that the present embodiment uses the boxing function ~[«] in Fig. 3. Also, assume that in Fig. 3 The values of the frame factors 301 to 307 on the left are 0.875, 〇·75, 0.625, 0.5, 0.375, 0.25, and 0.125. The value of the frame factor 24 1379561 AFA-P06001 21493 twf.doc/n 308~314 on the right side depends on The order is 0 875, 0.75, 0.625, 0.5, 0.375, 0.25, 0.125. In addition, for convenience of description of the present embodiment, the frame factors 301 to 307 on the left side are defined as two groups, wherein the frame factors 301 to 303 are defined. In order to frame the left half frame, the frame coefficients 304 to 307 are defined as right half frame coefficients; similarly, the frame coefficients 308 to 314 on the right side are defined as left half frame coefficients 308 to 310 and right half borders, respectively. The coefficients are 311 to 314. The framed device 900 proposed in this embodiment can reuse the framed coefficients. Therefore, it is assumed that the framed coefficient storage unit 910 of the present embodiment stores only four framed coefficients 304 to 307. Next, the framer device 900 is assumed to be included. At a receiving end, the receiving end has a channel estimation module (not shown), and the channel estimation module estimates the channel impulse response by using the received signal from the channel, and calculates the channel length from the channel impulse response. . In addition, it is assumed that the receiving end is applied to the OFDM system, and the received signal from the channel contains a plurality of OFDM symbols, and a guard interval is included in each symbol, and the loop pre-signal is not included in the guard interval. The original symbol length of the guard interval is L, that is, the actual length of the original symbol is L unit sampling time. The relationship between the channel length and the guard interval is as shown in Fig. 1. In addition, after the receiving end samples the received signal, the sampling signal S[n] is input to the framing device 900', and the framing device 900 can be the same as the adjusting frame device 600' in the second embodiment. The length of the channel calculated by the module is used to adjust the edge of the framed function and frame the sampled signal S[n] to correctly extract each OFDM symbol and effectively prevent narrowing in the channel. Band interference. 25 1379561 AFA-P06001 21493twf.doc/n Please refer to FIG. 3, FIG. 7 and FIG. 9 at the same time. At the beginning, the tear edge amplitude generating unit 920 receives a channel length, and the channel length is, for example, the channel estimation module in the end. Provided. Thereafter, the edge amplitude generating unit 92 will find the difference between the channel length and the guard interval, for example, the length of the guard interval minus the channel length. ° ° Next, the 'roll edge amplitude generating unit 920 will depend on the guard interval and The difference in channel length 'determines a reduced sampling factor, denoted D, to adjust the edge of the boxing function. In the present embodiment, the 'downsampling factor is, for example, the power of 2', that is, the 'downsampling factor D' can be expressed as 2, ·, where 丨 is a positive integer. Here, for convenience of explanation of the present embodiment, it is assumed that the edge amplitude generating unit 920 determines the downsampling factor D = 2. After the roll amplitude generating unit 920 decides to reduce the sampling factor, the sampling factor D is reduced at each interval, and the corresponding frame factor is excluded. Here, since the sampling factor £&gt;==2 is reduced, the edge amplitude generating unit 920 will exclude the frame coefficients 30, 303, 305, 307, 308, 310, 312, and 314 in Fig. 3. And an adjustment boxing function ' is composed of the remaining frame coefficients 302, 304, 306, 309, 311 and 313 as shown in FIG. The values of the remaining 'boxing coefficients 302, 304 and 306 are 0.75, 0.5 and 0.25, respectively. In other words, at this time, the edge amplitude generating unit 920 only uses the framed coefficients 304 and 306 stored in the framed coefficient storage unit 910 to generate the framed coefficients 701 to 706 in FIG. The signal S[n] is framed. After the roll amplitude determines the downsampling factor Z), it will be sequentially extracted from the 26 four frame factors 3G4~3G7 - the specific frame factor ~», where 'the relationship with the box function 々[«] is as follows: xjst /d[w] (4) \y&gt;K[K-Dnl n=:K..,K/D/2 ί w^Dn^ « =(尺/β/2) + 1,._·χ/ £»-ΐ In this embodiment, since the downsampling factor D = 2, = 2 has been determined, the 'special hybrid coefficient = ["], and the above (4) can be converted to χκη\.η\: 1 κ Rt = 1,...,1(5) 4 _K , Κ w =--1-1,..., —1 4 2 ,, the first-addition unit in the edge amplitude generating unit side will be the same as C-fq ^ After subtraction, the output difference is :::: Γ where the constant c is a real number. In the present embodiment, the hang number is, for example, the multiplex unit 925 secret to the first addition list = 922 and the framing coefficient storage unit 41. 〇, receiving the framed coefficient to store the difference between the %/2W outputted by the 7L 910 and the adding unit 422, and the multiplex unit 425 is at each sampling time, according to a selection signal.士]财骑 „ 之 之 之 振幅 振幅 振幅 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 900 is to first frame the sampling time #[1] of the sampling time „=1, that is, it is necessary to generate the frame factor 70 in FIG. 7 and it is known from the above (5) that the edge amplitude generating unit 92 The specific frame factor of 〇 is taken out~/2[1]=~[6], that is, when „=1, the edge amplitude generating unit 620 will read out the frame factor 306. The value of 701 is the difference between the boxing coefficient 3〇6 and j, so ., multi, single, 925 select ^^ as the edge amplitude ~/2[1], and the rolling vibrating 1 ft / 21" The value is 0.75. 1379561 AFA-P0600 1 21493twf.doc/n The selection signal received by the multiplex unit 925 is, for example, the selection signal in FIG. 4, which is changed according to the frame factor to be generated as the left half frame factor or the right half frame factor. status. In the operation of the above-described edge amplitude generating unit 920, 'the frame factor 701 is the remaining frame factor 〇2 because the frame factor to be generated is the frame factor 701, so the frame factor 7〇1 is the left half. The frame factor ', therefore, the selection signal is 〇, and the multiplex unit 925 selects the difference value output by the first adding unit 922 as the edge amplitude ～/2[1] ' and outputs it to the frame operation unit 930. Next, the frame operation unit 930 receives the sampling signal S[1] and inputs it to the multiplication unit 932 and the second addition unit 934. Thereafter, the multiplying unit 932 multiplies the sampling signal S[1] by the edge amplitude ～/2[1] output by the multiplex unit 925 'output product ～/2[l]xS[1]=〇75S(1) to the second addition Unit 934. Next, the second adding unit 934 subtracts the sampling signal s[1] from the product 〇.75S[1] output from the multiplying unit 932, and outputs and stores the difference value 0.25S[1] to the buffer unit 936. Then, in accordance with the same hardware operation as described above, the edge amplitude generating unit 920 sequentially extracts the framed coefficients 304 and 306 stored in the framed coefficient storage unit 91 to generate a roll amplitude of ~/2 [2] = 0.5. With ~/2[3] = ()·25. The difference values 0.5S[2] and 〇.75S[3] are generated and stored in the buffering operation unit 930 to the buffer unit 936. Next, since the framed coefficients corresponding to the sampling signals S[4], S[5], ..., S[L] are 1, the sampling signals S[4], S[5], ..., S[L ] will be directly input to the back-end processing, and will not be input to the framer 9 (^ and in the next step, the sampling signal S[L+1]~s[L+3] will be framed 28 1379561 AFA -P06001 21493 twf.doc/n. In this case, it is assumed that the framing device 400 first operates on the sampling signal S[L+1], so that a framed coefficient 704 needs to be generated, and the value of the framing coefficient 7 〇 4 is The difference between the framed coefficients 306 and 1. Therefore, the edge amplitude generating unit 920 reads the framed coefficient 306 stored by the framed coefficient storage unit 910 as a specific framed coefficient +, and its value is 〇.25. ^ Then, the addition unit 922 will calculate the difference between the specific frame factor ～/2[^ + 1] and 1 and output the difference + to the multiplex unit 925, where the difference heart/2[1 + 1] It is 0.75. Since the frame factor 7〇4 which needs to be generated at this time is the remaining frame factor 309, the frame factor 704 is the left half edge amplitude, and therefore, the selection signal received by the multiplex unit 925 is 〇. Thereafter, the multiplex unit 425 will use the difference + as the edge amplitude Z/^2[L + 1] corresponding to the frame factor 7〇4 according to the selection signal, and output it to the multiplication unit 932 in the frame operation unit 930. The multiplication unit 932 in the arithmetic operation unit 930 receives the sampling signal S[L+1], and multiplies the edge amplitude + η by the multiplication unit 932 by the sampling signal S[L+1], and outputs the product ~/2 [1 + 1] xS[L+1]=〇.75S[L+l] to the third adding unit 938. The mussels contain the cyclic preamble signal in the 0Fdm symbol to be framed by the framing device 900. The sampling signal S(1) can be inferred~ s[3] is the same repetitive signal as the sampling signal S[L+l]~S[L+3]. Therefore, the framer 9〇〇 will use the sampling signals S[l]~S[3] and the sampling signal S [L+1]~S[L+3] are characteristics of the same signal to restore the original signal. After the third addition unit 938 receives the product of the multiplication unit 932 output 0.75S[L+1], the addition Unit 938 will be stored in the buffer before being read out

29 AFA-P06001 21493twf.doc/n 0.25S[1] of 936, and 〇.75S[L+1] is added to (^^(1) and output to the backend processing to restore the device at the back end. The original signal is output. Then, according to the above-mentioned hardware operation, the edge amplitude generating unit 92 will sequentially generate the frame factor 7〇5 and . /2 [L + 3], and output to the frame operation unit 930. The values of the edge amplitude, /2[1/ + 2], and /2[1 + 3] are 0.5 and 0.25, respectively. The arithmetic unit 930 sequentially adds 〇.5S[L+2] to the 〇5S[2] previously stored in the buffer unit 936, outputs it to the backend processing, and adds 〇.25S[L+3] before After being stored in 0.75S[3] of buffer unit 936, the output is output to the back end processing to allow the device at the back end to restore the original signal. In the subsequent operation, the edge amplitude generating unit 920 will continue to receive the channel estimation. The length of the channel provided by the module, and according to the difference between the protection interval and the length of the channel, the sampling factor D is determined to be adjusted to adjust the edge of the framed function. Therefore, according to the above operation mode, The framed device 9〇〇 can adjust the edge of the framed function in time to avoid the interference between the symbols when the signal on the symbol is captured, and can also effectively reduce the narrow band interference of the received signal in the channel. According to the above description, the invention adjusts the pivoting edge according to the difference between the length of the channel and the protection interval. When the length of the channel is long, the difference is small, the length of the edge is reduced to avoid the adjacent symbol. When the channel length is short 'to make the above difference large, the edge length is enlarged to effectively reduce the narrow band interference of the received signal. Therefore, the present invention can prevent inter-symbol interference. In addition, the present invention Applied to multi-carrier systems, 1379561 AFA-P06001 21493twf.doc/n For example: orthogonal frequency division multiplexing system, the present invention can more effectively avoid Inter-Carrier Interference (ICI). Although the present invention has been better The embodiments are disclosed above, but are not intended to limit the invention, and those skilled in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of protection = the scope of the patent application is subject to the definition of the patent application scope. μ [Simple diagram of the diagram] Figure 1 shows the diagram of the signal received in the channel environment of multi-path. /, Figure 2 3 is a block diagram of the embodiment of the present invention. FIG. 4 is a block diagram of a framed device according to a first embodiment of the present invention. FIG. 6 is a block diagram of an apparatus for adjusting a frame according to a second embodiment of the present invention. FIG. 7 illustrates an adjustment boxing function according to an embodiment of the present invention. FIG. 8 is a flow chart showing the steps of the method for adjusting the frame according to the second embodiment of the present invention. FIG. 9 is a block diagram of a framer according to a third embodiment of the present invention. [Main component symbol description] = channel length

31 1379561 AFA-P06001 2I493twf.doc/a

Tav: effective capture interval GI: guard interval L: symbol length 110, 120: signal 130: boxing function K, K': edge length 301~314, 701~706: boxing coefficient S[n]: sampling Signal 400, 900 framing device 600: framing device 410, 610, 910: framing coefficient storage unit 420, 620, 920: rim amplitude generating unit 422, 922: first adding unit 425, 925: multiplex unit 430, 630, 930: boxing operation units 432, 632, 932: multiplication units 434, 934: second addition units 436, 636, 936: buffer units 438, 938: third addition unit 638: addition units S510 to S570: Each step S810-S880 of the framing method of the first embodiment of the present invention: each step 32 of the framing method of the second embodiment of the present invention

Claims (1)

1379561 May 18, 2011 Correction Replacement Page 10, Patent Application Scope: 1. A method of adjusting the frame, including the following steps: detecting a channel length; finding a difference between the channel length and a guard interval; and defining a plurality of framed coefficients; determining a reduced sampling factor according to the difference; in the boxing coefficient, the reduced sampling is performed every interval, leaving a corresponding framed coefficient to obtain an adjustment frame function; and the adjustment frame is The function is to frame the received signal. The light boxing method described in Item 1 of Zhongding i Hr Township, the Zhongyiyi boxing function, is expressed as follows: Its RAn], C. ρ Γτ K^n&lt;L y^C + Zn], L + l&lt;n^L + K_l η Other piping: length, number two, two is real number ' ” is the sampling time 'especially the coefficient, the corresponding time is: constant, ~w is the first, the sampling time corresponding to the frame edge The sample time 'shooting edge length k is the roll 3. If Shen Qing patent scope cuts down the sampling factor table ^ = adjusts the boxing method' its entire boxing function, such as τ: is "positive integer, definition - adjust wK [n] 33 1379561 Modified the replacement page RADn], C, RK[D(K/D + L^n)h l&lt;n&lt;K/Dl K / D &lt;n&lt; LL + l&lt;n&lt;L + K/Dl The other above ~/J«] is the "adjustment frame factor of the sampling time. 4. A framed device" uses a boxing function to perform a received signal, which is a hybrid function. Having a frame factor of a __ side and a frame factor of a second side, and the frame factor of the first side and the squaring coefficient of the second side each include a plurality of first half frame coefficients a plurality of second half frame coding factors, the frame formation device includes: a frame factor storage unit for storing the first half frameization coefficients of the frame coefficients of the first side; And performing, by the first half frame coding coefficients, a complementary operation, generating the second half frameization coefficients of the first side frame coefficients and the frame coding coefficient of the second side; and The operation unit framing the received signal by using the second half frameization coefficient of the frame coefficients of the first side and the frame factor generated by the edge amplitude generating unit. The framing device of the fourth aspect, wherein a length of the flange is defined as a definition, and a sampling time is defined as “, the above is a natural number, and the length of the edge particularly indicates that there are X unit sampling times, and The boxing coefficient of the πth time is expressed as %[«], and the edge amplitude generating unit comprises: a first adding unit, which is connected to the boxing coefficient storage unit, 34 1379561 In the correction replacement page of May 18, 101, the first half frameization coefficients stored in the frame factor storage unit are represented as /2, and the frame factor storage unit outputs a pending frame factor according to the sampling time. For ΧΚ [^]= wKlnl n = l,...,K/2 ^ΛΚ-nl n = K/2 +1,..., Κ -1 The first addition unit singulates the specific framing coefficient~[ „] subtracts from a constant to obtain eight [n] = C-χ&gt;]', where the constant is expressed as c, c is a real number; the evening unit is coupled to the first adding unit and the boxing coefficient is stored 2 yuan, and at each sampling time „, select the output heart (5) or the coffee is the “sampling time of the rolling edge amplitude coefficient 乂[„], where 6·such as the patent scope 5th boxing function' is expressed as follows: η =Λ"..,ΚΙ2 ”=尤/ 2 +1,···, the framed device described in item 1 〇5, where w rule [η] Rk^&gt;\&lt;n&lt;K /2 €~^ΛΚ~η], K/2 + l&lt;n&lt;Kl C, K&lt;n&lt;LWK[^ + L~n], L + l&lt;n&lt;i + x_i 〇, other above Γ2 ,, is the boxing coefficient of the first, sample time. The framed device of the sixth aspect, wherein the pivot multiplication method has a first input end, a second input end 35 1379561, a modified replacement page and an output end of the first input end of May 18, 101 Receiving a received signal 'represented as *, the second input end is coupled to the multiplex unit for multiplying the received signal by the sampling time w, multiplied by the edge amplitude coefficient 〜[w], and outputting zK[n]-S[n]; a second adding unit having a first input end, a second input end and an output end, the first input end receiving the received signal*, and the second input end thereof Receiving ~ for outputting the received signal * minus kW.sW according to the sampling time w, expressed as (1-々W).%]; • a buffer unit 'for storing the output of the second adding unit (1~~|&gt;]).%]; and a second adding unit having a first input terminal, a second input terminal and an output terminal 'for sampling time "between Z + 1S«幺Z + owed -1, its first input is received, its second input reads 0_ stored in the buffer unit, and its output is output 〜[«].Wind"] and (1 -~h -1)). - The framing device of claim 4, wherein the rolling edge amplitude generating unit is used for Receiving a channel length, and calculating a difference between the channel length and a guard interval, and determining a shrink sampling factor according to the difference. 7 9. The framing device of claim 8, wherein the downsampling factor is expressed as = 2*', and a roll length table is defined, and a sampling time is defined as "," , ", ruler is from 1 number ^ The length of the piping &amp; indicates that there is a unit time, and in the "Time Boxing Coefficient is expressed as %[«], and the edge amplitude generating unit includes: 36 1379561 1〇1 On May 18th, the first addition unit of the replacement page 2 is modified, coupled to the framed coefficient storage unit, and the first half-framed coefficients stored in the second C memory list are stored, and the frame-breaking coefficient is stored according to the sampling. Time? 2 is a specific boxing coefficient, expressed as ΧΚ!〇[η\ wKWn], n = 1,..., A:/D/2 ^K[K~Dn], n = K/D /2 + \y..., K/D~\ The first addition unit takes the specific boxing coefficient ~(9) 盥一^ to obtain, W=cW^t' the table of the table is the real number; And the hexagram unit is coupled to the first adding unit and the framing coefficient storage unit 'and at each sampling time", and the output core (7) Μ or %//) [«] is selected as the first sampling time Amplitude coefficients, wherein, ΖΚ! Square [η ^ x kid ln], n = 1, ..., ^ / 2 ^ / 2 χκι〇 [γι], n = KIDIl + \, .. "KID- \. 10. The framing device of claim 9, wherein the framing function is adjusted after the downsampling factor, and an adjustment boxing function 'is expressed as follows: ^αγΡ«], 1&lt;η&lt; Κ/2 C~RK[K-Dn], K/2 + \&lt;n&lt;K-\ Λ1; KID [n] = &quot;lC, K&lt;n&lt;L wkid[^ID + L~n], L + \&lt;n&lt;L + Kl 0, the other above L is a symbolized length of the symbol length ' representing the "sampling time". U. The framing device according to the first aspect of the patent application, wherein the 37 1379561 The boxed arithmetic unit includes: ιοί年月18 曰Fixed replacement page first multiplication unit• / X nj ^hii / \ ir — »· ».« The first round of the second input end _ to the end Guard unit, f coffee], multiply the received signal by the edge amplitude coefficient between "' is 'W·ah (four) ά ^ a second addition unit, having a first input, - spear input wall And an output terminal, the first input end receives the received signal &lt;s[«], and the first input end thereof receives ^dIX^o], according to the sampling time ", the splicing ^ signal is subtracted from Z" / £&gt;W, after SW output 'represented as. A buffer unit for storing (1-~/〇1^)).] and a third addition unit having a The first input end, the second input end and an output end are used when the sampling time is "between z + 厶 + especially / Z" - 1, and the first input receives 2 &amp; / £) [&quot;]. ^1"], its Having a first input end, indicating that the second input end reads the buffer unit (1_zw Bu Yi Qiu_Caf-1), and its output terminal outputs 々/士]·*^] and (1~2 please | &gt; - L]). - L] Wf/jD〇-1] · - [] sum. 38