WO2004105299A1 - Reception quality determining apparatus and receiver apparatus - Google Patents

Abstract

A reception quality determining apparatus for determining a reception quality by use of bit error rate estimation includes, in addition to a first bit error rate estimation part (114) that de-interleaves and decodes a signal detected by a detector part (103), a second bit error rate estimation part (110) that does not perform such de-interleaving and decoding as performed by the first bit error rate estimation part (114) but estimates a bit error rate from a CNR estimation result of, for example, a symbol interval N. When the first bit error rate estimation does not terminate in an interval for determining the reception quality, the result of a bit error estimation of the second bit error rate estimation part (110) that has already terminated is used for the remaining portion of the interval in which the first bit error rate estimation does not terminate. In this way, the reception quality can be estimated without any delay in the line quality determination of a digital mobile communication.

Description

 Description Reception quality measuring device and receiving device Technical field

 The present invention relates to a reception quality measurement device and a reception device suitable for use in a reception device that receives a modulated wave signal obtained by modulating a code subjected to encoding and interleaving. Background art

 FIG. 1 is a block diagram showing a configuration of a conventional reception quality measuring device.

 The reception quality measurement device shown in FIG. 1 includes a detection unit 11, a decoding unit 12, an encoding unit 13, a comparison unit 14, a bit error rate estimation unit 15, and a reception quality calculation unit 16. It is composed of Detection section 11 performs detection processing on the received signal to obtain symbol data. The decoding unit 12 performs decoding processing on the symbol data from the detection unit 11 to obtain error-corrected data. As the decoding unit 12, for example, a Vidabi decoder is used. The encoding unit 13 performs the same encoding on the error-corrected data decoded by the decoding unit 12 as on the transmitting side to obtain re-encoded data after error correction.

 The comparison unit 14 compares the symbol data obtained from the detection unit 11 with the re-encoded data after error correction obtained from the encoding unit 13 and counts the bits that do not match for each bit. The bit error rate estimator 15 estimates the bit error rate from the rate at which the “symbol data” from the detector 11 does not match the “recoded data after error correction”. The reception quality calculator 16 obtains reception quality based on the bit error rate estimated by the bit error rate estimator 15.

The above-mentioned reception quality measuring device can measure only the average bit error rate in the interleaved section when the transmitting side performs the interleaving processing after encoding, and cannot obtain the bit error rate in the section shorter than the interleaved section. Can not. For example, ME AN—B in the Global System for Mobile communications (GSM) system In a reception quality measurement such as EP, the variance of the bit error rate in a section shorter than the interleave section must also be reported as the reception quality measurement result, and the bit error rate before the dinterleaping operation needs to be obtained.

 Therefore, the same interleaving as on the transmitting side is performed on the “re-encoded data after error correction” obtained by the encoder 13 to obtain the bit error rate on the line before the dinter-leap processing. Quality measuring devices have been devised.

 FIG. 2 is a block diagram showing the configuration of this type of reception quality measuring device. As shown in FIG. 2, a din taller 21 is provided between the detector 11 and the decoder 12. An interleaver 22 is provided between the encoder 13 and the comparator 14. The dingleaver 21 subjects the symbol data obtained from the detector 11 to dingaling processing to obtain data before interleaving on the transmission side. Interleaver 22 applies the same interleaving to the “re-encoded data after error correction” obtained in encoding section 13 as on the transmitting side. This makes it possible to determine the bit error rate on the line before the dinterleaving process (before the operation). Note that an interleaver (second interleaver) having the same characteristics as that of the transmitting-side interleaver is provided on the receiving side, that is, the error-corrected data generated by the decoding unit is provided to the second interleaver. A technique for measuring the number of error bits by passing through is also disclosed in Patent Document 2, for example.

However, in the reception quality measurement device that obtains the bit error rate on the line before the dinterleave processing by applying the same interleaving to the “re-encoded data after error correction” to the transmission side, the bit error rate There is a problem that the time to obtain is delayed by a time proportional to the length of encoding and interleaving. For example, in a system such as GSM, the section for measuring the reception quality and the timing of reporting are defined, and the problem that the measurement of the bit error rate does not end by the reporting timing depending on the interleave length is a problem. is there. Disclosure of the invention An object of the present invention is to provide a reception quality measurement device and a reception device capable of measuring reception quality without delay.

 The purpose of this is to provide a reception quality measuring device for measuring reception quality by bit error rate estimation, in addition to the first bit error rate estimation means for performing ding leave processing and decoding processing on the signal detected by the detection means. A second bit error rate estimating means for estimating a bit error rate from a CNR (carrier-to-noise power ratio) estimation result without performing the deinterleaving processing and decoding processing performed by the first bit error rate estimating means, If the first bit error rate estimation processing is not completed within the period for measuring the reception quality, the second bit that has already been completed for the remaining period in which the first bit error rate estimation processing has not been completed This can be achieved by using the bit error rate estimation result of the error rate estimation processing means. BRIEF DESCRIPTION OF THE FIGURES

 Fig. 1 is a block diagram showing the configuration of a conventional reception quality measurement device.

 FIG. 2 is a block diagram showing the configuration of another conventional reception quality measuring device,

 FIG. 3 is a block diagram showing a configuration of a receiving apparatus according to one embodiment of the present invention, FIG. 4 is a diagram for explaining an operation of the receiving quality measuring apparatus according to one embodiment of the present invention, and

 FIG. 5 is a diagram showing an example of a bit error rate estimation accuracy in the reception quality measuring apparatus according to one embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 3 is a block diagram showing a configuration of the receiving apparatus 100 according to one embodiment of the present invention. According to FIG. 3, the detector 103, the first bit error rate estimator 111, the second bit error rate estimator 110, the timing generator 111, the bit error rate selector 112, and The reception quality calculation unit 113 constitutes the reception quality measurement device 115. In FIG. 3, receiving apparatus 100 according to the present embodiment receives antenna 101 receiving a modulated wave signal obtained by modulating a code subjected to encoding and interleaving, and antenna 101 receiving RF unit 102 that down-converts the received signal from radio frequency to baseband frequency, and detects and symbolizes the received signal that is down-converted from radio frequency to baseband frequency by RF unit 102 The detector 103 for obtaining data, the first bit error rate estimator 114, the second bit error rate estimator 110, and the first bit error rate estimator 114 A timing generator 111 for generating a timing signal for selecting either the estimation result or the estimation result of the second bit error rate estimator 110, and a timing from the timing generator 111 The first bit error rate estimator 1 1 The bit error rate selector 1 12 that selects either the fixed result or the estimation result of the second bit error rate estimator 1 10, and the estimation result selected by the bit error rate selector 1 1 2 And a reception quality calculation unit 113 for calculating the reception quality from the data and outputting the reception quality calculation result.

 The first bit error rate estimator 1 14 is configured to calculate a signal obtained by performing a dinterleaving process on the signal detected by the detection unit 103 and a signal obtained by performing a dinterleaving process by the A decoding unit 105 for decoding, an encoding unit 106 for performing the same encoding as that of the transmitter on the signal decoded by the decoding unit 105, and an encoding unit 106 for encoding An interleaver 107 that performs the same interleaving process on the signal as the transmitter, a comparator 108 that compares the output data of the detector 103 and the interleaver 107 for each symbol, and a comparator 108 It consists of a bit error rate estimator 109 and a power for estimating the error rate of the symbol section N from the result of. The second bit error rate estimator 110 estimates the bit error rate of the symbol section N with a certain degree of accuracy from the result of the detector 103. The reception quality calculation section 113 calculates the reception quality of the measurement section from the bit error rate of the symbol section N output from the bit error rate selection section 112.

Next, FIG. 4 shows the operation of the reception quality measuring apparatus 115 according to the present embodiment. This will be described with reference to the operation state diagram shown.

 In FIG. 4, 201 indicates the reception timing of the received signal, and 202 indicates the bit error rate estimation result in the second bit error rate estimator 110. In addition, reference numeral 203 denotes a bit error rate estimation result in the first bit error rate estimator 114, and reference numeral 204 denotes a bit error rate selection result in the bit error rate selector 112. I have.

 First, a received signal is received at the timing shown in FIG. On the transmitting side, interleaving processing is performed so that the blocks of the code processing unit overlap each other, and transmission is performed in units of N symbol intervals. In this example, the interleave length is 4 frames, the measurement interval is the interval from frame 1 to frame 12, and the reception quality reporting timing indicates frame 14.

 Next, as shown in 202, the second bit error rate estimation result is output one frame after the signal reception timing. Furthermore, as shown in 203, in the first bit error rate estimation, first, a block is generated by performing a dinter-leap process and a decoding process is performed. Interleave processing is sequentially performed, and a frame signal in which an error has been corrected is output. Here, for example, to obtain the corrected frame signal # 1-4, the result of Codec #l and Codec # 2 is necessary, and the received signal of frame signal # 6 including Codec # 2 is received. After that, the processing is started, so it is delayed by two frames compared to the second bit error rate estimation result.

In the bit error rate selection section 112, timing adjustment and synthesis of the first bit error rate estimation result and the second bit error rate estimation result are performed. Here, since the first bit error rate estimation result is delayed by two frames, it cannot be used for the latter two frames for the reception quality measurement report timing. Therefore, as shown by the result of the selection of the bit error rate of 204, the previous 10 frames were combined with the first bit error rate estimation result, and the last 2 frames were combined with the second bit error rate estimation result. Become something. In this way, the delay of the result of the first bit error rate By supplementing with the estimation result, the reception quality can be measured without delay.

 As a method of implementing the second bit error rate estimator 110, for example, a method of estimating a bit error rate from a CNR (Carrier to Noise Ratio) estimation result of a symbol section N can be mentioned. In general, such an estimation method has lower accuracy than a method using error correction by decoding such as the first bit error rate estimator 114. However, by combining the first bit error rate estimator 114 with good estimation accuracy at a certain rate, the final reception quality measurement accuracy is improved. The estimation accuracy of 0 need not satisfy the target accuracy.

 FIG. 5 shows an example of the estimation accuracy of the first bit error rate estimator 114 and the second bit error rate estimator 110.

 In FIG. 5, reference numeral 310 denotes the estimation accuracy of the first bit error rate estimator 114, and reference numeral 302 denotes the estimation accuracy of the second bit error rate estimator 110. . Reference numeral 303 denotes a combination of the bit error rate estimation result of the first bit error rate estimator 114 and the bit error rate estimation result of the second bit error rate estimator 110 according to the configuration of the present embodiment. Represents the characteristics that have been obtained. Reference numeral 304 denotes an example of the target measurement accuracy.

 Since the second bit error rate estimator 1110 does not satisfy the target accuracy by itself, it cannot be used as it is for reception quality measurement. However, by using the bit error rate estimation result of the first bit error rate estimator 114 with good measurement accuracy in the section before the report timing, the accuracy of the overall reception quality measurement accuracy is improved. The target accuracy can be satisfied.

As described above, according to the present embodiment, the bit error rate estimation processing by first bit error rate estimating section 114 with respect to the reception quality calculation timing is performed by second bit error rate estimating section 110. If the first bit error rate estimation processing does not end within the section for measuring the reception quality because it is later than the bit error rate estimation processing, the remaining Since the bit error rate estimation result in the section is used as the bit error rate estimation result of the second bit error rate estimator 110, the reception quality can be calculated without delay. It is possible to report reception quality measurement results without delay.

 The receiving apparatus 100 according to the present embodiment is suitable for use in a mobile station or a base station of digital mobile communication.

 As described above, according to the present invention, in a receiving apparatus provided with a receiving quality measuring apparatus that measures reception quality by estimating a bit error rate, the signal detected by the detecting means is subjected to the delta-leaving processing and the decoding processing. In addition to the first bit error rate estimating means, the bit error rate can be calculated from the result of e.g. CNR transport wave-to-noise power ratio without performing the deinterleaving processing and decoding processing performed by the first bit error rate estimating means. The second bit error rate estimating means for estimating the rate is provided, and if the first bit error rate estimating process is not completed within the period for measuring the reception quality, the bit error rate of the second bit error rate estimating means is Since the estimation result is used, the reception quality can be calculated without delay, and as a result, the reception quality measurement result can be reported without delay in the reception quality report timing. It is possible to provide a reception quality measuring apparatus having the effect of.

 The present specification is based on Japanese Patent Application No. 2003-142424, filed on May 20, 2003. This content is included here.

Industrial applicability

 INDUSTRIAL APPLICABILITY The present invention is suitable for use in a reception quality measurement device and a reception device that receive a modulated wave signal obtained by modulating a code subjected to encoding and interleaving and measure reception quality.

Claims

The scope of the claims  1. Detecting means for detecting a signal obtained by receiving a radio signal of a coded and interleaved code, and performing a dinterleaving process and a decoding process on the signal detected by the detecting device. The obtained data is subjected to the same coding and interleaving processing as the coding performed on the transmission side of the radio signal to obtain error-corrected data, and the data before the error-corrected data is subjected to the interleave processing. First bit error rate estimating means for estimating the bit error rate by comparing the data with the data of the first and second bit error rates, and a dint-leaving process performed on the signal detected by the detection means by the first bit error rate estimating means. Second bit error rate estimating means for estimating the bit error rate without performing decoding processing, the first bit error rate estimating means for the reception quality calculation timing, and the second bit error rate Timing determining means for determining the timing for selecting the estimation result of the first bit error rate estimating means and the estimation result of the second bit error rate estimating means based on the processing delay of each rate estimating means; Bit error rate selecting means for selecting the estimation result of the first bit error rate estimating means and the estimation result of the second bit error rate estimating means at the timing determined by the timing determining means; and And a reception quality calculating means for calculating reception quality from the bit error rate estimation result selected by the means. 2. Receiving means for receiving a radio signal of an encoded and interleaved code, a detecting means for detecting a signal received and received by the receiving means, and a signal detected by the detecting means Data obtained by performing the interleaving process and the decoding process is subjected to the same encoding and interleaving process as the encoding performed on the transmission side of the radio signal to obtain error-corrected data, and First bit error rate estimating means for estimating a bit error rate by comparing the error-corrected data with data before performing deinterleaving processing; and a first bit error rate estimating means for estimating the signal detected by the detecting means. A second bit error rate estimating means for estimating the bit error rate without performing the dint-leaving and decoding processes performed by the bit error rate estimating means of The estimation result of the first bit error rate estimation means and the second bit error rate are calculated based on the processing delays of the first bit error rate estimation means and the second bit error rate estimation means with respect to the calculation timing. Timing determining means for determining the timing for selecting the estimation result of the rate estimating means; and the estimation result of the first bit error rate estimating means and the second bit error at the timing determined by the timing determining means. A receiving apparatus comprising: a bit error rate selection unit that selects an estimation result of the rate estimation unit; and a reception quality calculation unit that calculates reception quality from the bit error rate estimation result selected by the bit error rate selection unit.  3. A base station including a receiving device, wherein the receiving device receives a radio signal of a code that has been encoded and interleaved, and the radio signal is received by the receiving device. Detection means for detecting a signal; and data obtained by subjecting the signal detected by the detection means to dent leave processing and decoding processing, similar to the encoding performed on the transmission side of the radio signal. First bit error rate estimating means for obtaining error-corrected data by performing encoding and interleaving processing, and comparing the error-corrected data with data before being subjected to dinterleap processing to estimate a bit error rate. A second bit error rate estimating means for estimating the bit error rate without performing the dinterleaving process and the decoding process performed by the first bit error rate estimating means on the signal detected by the detecting means. And an estimation result of the first bit error rate estimating means based on a processing delay of each of the first bit error rate estimating means and the second bit error rate estimating means with respect to the reception quality calculation timing. Timing determining means for determining a timing for selecting an estimation result of the second bit error rate estimating means; and an estimation result of the first bit error rate estimating means at the timing determined by the timing determining means; Bit error rate selecting means for selecting an estimation result of the second bit error rate estimating means; and reception quality calculating means for calculating reception quality from the bit error rate estimation result selected by the bit error rate selecting means. Have. 4. A mobile station equipped with a receiving device, wherein the receiving device performs coding and interleaving. Receiving means for receiving a radio signal of a code subjected to the signal processing, detecting means for detecting a signal received and received by the receiving means, and dinterleaving and decoding of the signal detected by the detecting means. The data obtained by performing the above processing is subjected to the same coding and interleaving processing as the coding performed on the transmitting side of the radio signal to obtain erroneously corrected data. First bit error rate estimating means for comparing the signal detected by the detection means with the first bit error rate estimating means for estimating the bit error rate by comparing the bit error rate with the data before performing the dinterleaving process. A second bit error rate estimating means for estimating a bit error rate without performing dinterleaving processing and decoding processing performed by the determining means, and the first bit error rate estimating means for reception quality calculation timing. The timing for selecting the estimation result of the first bit error rate estimation means and the estimation result of the second bit error rate estimation means is determined based on the processing delay of each of the second bit error rate estimation means. A bit error rate selecting means for selecting the estimation result of the first bit error rate estimating means and the estimation result of the second bit error rate estimating means at the timing determined by the timing determining means. And a reception quality calculation means for calculating reception quality from the bit error rate estimation result selected by the bit error rate selection means. 5. Receiving and detecting the radio signal of the coded and interleaved code, the data obtained by performing the deinterleaving process and the decoding process on the obtained signal is further transmitted to the transmitting side of the radio signal. Error-corrected data is obtained by performing the same coding and interleaving processing as the coding performed in step 1, and the error-corrected data is compared with the data before deinterleaving processing to determine the first bit error rate. Then, the second bit error rate is estimated without performing dinterleaving and decoding on the signal obtained by the detection, and the first bit error rate estimation value for the reception quality calculation timing is calculated. Timing for selecting the first bit error rate estimation result and the second bit error rate estimation result based on the respective processing delays of the processing to determine and the processing to determine the second bit error rate estimation value At the determined, were determined timing A reception quality measuring method for selecting the first bit error rate estimation result and the second bit error rate estimation result, and calculating reception quality from the selected bit error rate measurement result.