CN1885843B - Apparatus and method for reducing peak-to-average ratio of multi-carrier system based on multiband filter bank - Google Patents

Abstract

The present invention proposes a device and method for reducing the signal peak-to-average ratio in a multi-carrier transmitter and receiver based on a multi-band filter bank. Linear transform, such as Fourier transform (DFT) or inverse Fourier transform (IDFT), etc., makes the signals modulated on each sub-band in the multi-carrier transmission signal have a certain correlation, thereby reducing the multi-band filter based on the multi-band filter bank. Signal peak-to-average ratio in a carrier transmitter.

Description

Device and method for reducing peak-to-average ratio in multi-carrier system based on multi-band filter bank

technical field

The present invention relates to multi-carrier transmission technology, and more particularly, relates to a device and method for reducing peak-to-average ratio in a multi-carrier transmitter based on a multi-band filter bank.

Background technique

In recent years, wireless communication systems have developed rapidly towards broadband; along with this development trend, the bandwidth occupied by a single channel in wireless communication systems is getting higher and higher, the complexity of wireless receivers is also increasing continuously, and the implementation complexity is getting higher and higher. At the same time, according to research in recent years, in order to effectively improve the throughput of the system, the combined multiple access technology of frequency division multiple access technology (FDMA) and time division multiple access technology (TDMA) will become the main multiple access technology of future mobile communication technology . Based on such technical requirements, multi-carrier modulation technology has attracted more and more attention from academia and industry. On the one hand, based on multi-carrier modulation technology, the complexity of the receiver can be greatly simplified; on the other hand, based on multi-carrier technology, The hybrid multiple access technology of FDMA and TDMA can be easily realized, which is very convenient for system capacity optimization and enhancement.

Under the current conditions, there are two main means of realizing multi-carrier modulation technology: one is based on Orthogonal Frequency Division Multiplexing (OFDM) and correspondingly expanded to form a multiple access scheme; the other is based on multi-band filtering Based on MBFB, corresponding expansion is carried out to form a multiple access scheme. The content described in the present invention is mainly aimed at the latter problem of power peak-to-average ratio (PAPR), and proposes a more effective control method.

The multi-carrier modulation technology based on the multi-band filter bank will inevitably encounter the PAPR problem in the application process, especially when the number of sub-bands used by the same terminal is large, the PAPR problem is more serious, which seriously affects the efficiency of the power amplifier. . Especially when the modulation technology of the multi-band filter bank is applied to the mobile terminal transmitter, it will directly lead to the reduction of the effective signal coverage level, the shortening of the power supply life, and the performance index is greatly reduced. For this reason, effective PAPR control must be carried out in order to make this specific multi-carrier modulation technology practical.

In order to reduce the peak-to-average ratio of multi-carrier modulation technology, commonly used solutions include clipping method, coding method and probability method. The clipping method is the simplest, but when the clipping threshold is lower than the peak-to-average value of the original signal, the performance of the system will obviously deteriorate. The coding method reduces the peak value of the transmitted signal by limiting the signal code set available for transmission, that is, only transmitting codewords whose amplitude peak value is smaller than a given threshold. Because the encoding/decoding complexity of this type of method is quite high, it is generally only applicable to multi-carrier systems with a small number of sub-carriers. Probabilistic methods mainly include partial transmission sequence (PTS) and selective mapping (SLM). This type of method is to linearly transform the symbol sequence before multi-carrier modulation, so that the symbol sequence after multi-carrier modulation has a lower peak probability. The disadvantage of this type of method is that the computational complexity is very high.

The present invention is proposed in order to solve the above-mentioned problems existing in the prior art.

Contents of the invention

The present invention proposes a linear transformation, such as Fourier transform (DFT) or inverse Fourier transform (IDFT), so that there is a certain correlation between the modulated signals on each subcarrier in the multi-carrier transmission signal, thereby reducing the Apparatus and method for multi-carrier transmitter peak-to-average ratio of filter bank.

According to a first aspect of the present invention, there is provided a method for reducing the peak-to-average ratio in a multi-carrier transmitting device based on a multi-band filter bank, which includes the following steps: serial-to-parallel conversion of the input serial symbol data sequence is a sequence of parallel symbol data blocks; performing linear transformation on the sequence of parallel symbol data blocks in the order of generation to generate a sequence of linearly transformed symbol data blocks; respectively mapping the element symbols in each of the linearly transformed symbol data blocks to the corresponding sub-channels, where the sub-channels are arranged in the order of their corresponding frequencies.

According to a second aspect of the present invention, there is provided a device for reducing the peak-to-average ratio in a multi-carrier transmitter based on a multi-band filter bank, which includes: a serial-to-parallel conversion device for converting the input serial The symbol data sequence is serially converted into a parallel symbol data block sequence; a linear transformation device is used to linearly transform the parallel data block sequence in the order of generation to generate a linearly transformed symbol data block sequence; a multi-band shaping filter bank A device, which includes a plurality of sub-filters, each of which corresponds to a sub-channel, wherein the sub-channels are arranged in order of their corresponding frequencies, wherein each of the sub-filters is used to convert the linearly transformed The corresponding element symbols in the symbol data block are mapped to the corresponding sub-channels.

According to a third aspect of the present invention, there is provided a method for receiving a signal with a reduced peak-to-average ratio in a multi-carrier receiving device based on a multi-band filter bank, which includes the following steps: performing and transmitting on the input symbol signal The corresponding inverse operation of the sub-channel mapping operation at the machine end to separate the multi-channel symbol data sequence; perform the linear inverse transformation corresponding to the linear transformation at the transmitter end on the multi-channel symbol data sequence to generate the symbol data after the linear inverse transformation A block sequence: performing parallel-to-serial conversion on the symbol data block sequence subjected to linear inverse transformation in order of generation, so as to generate a serial symbol data sequence.

According to a fourth aspect of the present invention, there is provided a multi-carrier receiving device based on a multi-band filter bank for receiving a signal with a reduced peak-to-average ratio, which includes: a matched filter bank device for performing An inverse operation corresponding to the sub-channel mapping operation at the transmitter end to separate the multi-channel symbol data sequence; a linear inverse transform device for performing a linear inverse transform corresponding to the linear transformation at the transmitter end on the multi-channel symbol data sequence , to generate a sequence of symbol data blocks subjected to linear inverse transformation; a parallel-to-serial conversion device, configured to perform parallel-to-serial conversion on the sequence of symbol data blocks subjected to linear inverse transformation in order of generation, so as to generate a serial symbol data sequence.

Compared with the prior art, the device and method of the invention can significantly reduce the peak-to-average ratio of the multi-carrier transmitter based on the multi-band filter bank.

Other objectives and effects of the present invention will become clearer and easier to understand through the following description combined with the accompanying drawings and the contents of the claims, and with a more comprehensive understanding of the present invention.

Description of drawings

The present invention will be described in detail below with reference to the accompanying drawings, wherein the same or similar reference numerals represent the same components.

1 is a block diagram of a multi-carrier wireless transmitter based on a multi-band filter bank that can reduce peak-to-average ratio in a mobile communication network according to an embodiment of the present invention;

Fig. 2 is a schematic diagram of two mapping modes between the column vector element symbol and the sub-channel output by FFT transformation;

3 is a flowchart of a method for reducing peak-to-average ratio in a multi-band filter-based multi-carrier wireless transmitter of a mobile communication network according to the present invention;

4 is a block diagram of a multi-carrier wireless receiver based on a multi-band filter for receiving signals transmitted by the wireless transmitter shown in FIG. 1 in a mobile communication network according to an embodiment of the present invention;

5 is a diagram of a method for receiving a transmission signal according to the present invention in which a peak-to-average ratio reduction process is performed at the transmitter end in a multi-carrier wireless receiver based on a multi-band filter bank in a mobile communication network according to a specific embodiment of the present invention flow chart;

FIG. 6 and FIG. 7 are graphs of the peak-to-average ratio complementary cumulative distribution function (CCDF) of the multi-carrier system based on the multi-band filter bank of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with specific embodiments. It should be understood that the invention is not limited to the specific examples.

FIG. 1 is a block diagram of a multi-carrier wireless transmitter with a multi-band filter capable of reducing peak-to-average ratio in a mobile communication network according to an embodiment of the present invention. It includes a channel coding device 11 , a digital modulation device 12 , a serial-to-parallel conversion device 13 , a Fourier (DFT) transform device 14 , a shaping filter bank device 15 , an RF frequency conversion device 16 and a transmitting antenna 17 .

It should be noted that the channel coding device, digital modulation device, RF frequency conversion device and transmitting antenna shown in Fig. 1 are not directly related to the object of the present invention, and are only described as a preferred implementation mode here.

Assuming that {a _k , k=0, 1, 2...} is the digital sequence of transmission information input to the wireless transmitter, the wireless transmitter of the present invention will be described in detail below with reference to Fig. 1:

The channel coding device 11 is used to channel code the input data sequence {a _k , k=0, 1, 2....} by using a predetermined channel coding rule, and transform it into an output data sequence {b _k , k=0 , 1, 2....}, wherein the channel coding rules can be, for example, concatenated codes composed of RS codes and convolutional codes, Turbo codes, or LDPC codes, or adaptive coding schemes composed of multiple technologies , such as Adaptive Coding and Modulation Scheme (AMC);

The digital modulation device 12 is used, for example, to map the channel-coded data sequence to the dot matrix of the modulation symbol according to the Gray coding specification, and generate a serial symbol sequence that has been mapped by digital modulation. The selected modulation method is determined by the system design. , can be determined as one of BPSK, QPSK, and QAM modulation methods, or can be multiple dynamic modulation methods adaptively selected according to bit error rate and carrier-to-interference ratio. Through the digital modulation device 12, the input data sequence {b _k , k=0, 1, 2....} is transformed into an output symbol sequence {d _k , k=0, 1, 2....};

The serial/parallel conversion device 13 is used to divide the serial symbol sequence obtained by the digital modulation mapping into a plurality of serial symbol data blocks according to the size of the subsequent FFT transformation matrix, and serialize the multiple serial symbol data blocks. and transformation operations to form a corresponding number of parallel symbol data blocks. After the serial/parallel conversion device 13, the input serial symbol sequence {d _k , k=0, 1, 2....} is transformed into a plurality of parallel symbol data blocks {e _k , k=0, 1, 2 ....}, here, e _k represents a column vector with the same number of elements as the size of the FFT transformation;

A linear transformation device 14, configured to perform linear transformation on each input parallel symbol data block {e _k , k=0, 1, 2....} to generate a linearly transformed parallel symbol data block {f _k , k=0, 1, 2, L}, the linear transformation is preferably an orthogonal linear transformation, such as Fourier (DFT) or inverse Fourier (IDFT) transformation (preferably, it can be realized by an FFT transformation module or an IFFT transformation module). . The size of the linear transformation, that is, the size of the column vector of the transformation matrix, depends on the number of subbands (subchannels) occupied by the transmitted signal.

The multi-band shaping filter bank device 15 is used to divide the entire channel bandwidth into several mutually orthogonal (quasi-orthogonal) sub-channels (or sub-bands), and each sub-filter in the filter bank corresponds to a sub-channel. In this way, each element symbol in the column vector of the parallel symbol data block {f _k , k=0, 1, 2, L} obtained through linear transformation is mapped to the corresponding sub-channel respectively. Generally, the number of sub-filters can be much larger than the number of signal paths input by the filter bank. Preferably, the number of sub-filters of the filter bank is an integer power of 2 (that is, 2, 4, 8, 16...); and, the size of the linear transformation is selected so that the number of sub-filters is FFT transform Integer multiples of the size; at the same time, ensure that each element symbol in the column vector of the parallel symbol data block output by the linear transformation is mapped to the sub-channels of the filter bank at equal intervals according to the sub-channel number. Figure 2 shows two mapping methods between the column vector element symbols output by linear transformation and the sub-filters of the filter bank, where the number of sub-filters is 16, and the linear (for example, FFT) transformation size is 4, as shown in Fig. As shown in 2, as long as the equidistant mapping is guaranteed, the mapping method between the symbol of the column vector element output by the FFT transformation and the sub-filter of the filter bank may not be unique. After being shaped and filtered by the signal shaping filter, the output signals of all the sub-filters are linearly added to form one output signal. Through the signal shaping filter device 15, the input symbol sequence {f _k , k=0, 1, 2, L} is transformed into an output waveform sequence {i _k , k=0, 1, 2, L};

The RF conversion device 16 is used to convert the waveform sequence {i _k , k=0, 1, 2, L}, which is a baseband symbol sequence, through sub-channel filtering and mapping into a radio frequency signal, and transmit it into the wireless channel via the transmitting antenna module 17 go.

Preferably, the wireless transmitter also includes a control device 17 (not shown in the figure for the sake of brevity) for performing the following functions:

1) Adjusting the bandwidth of the sub-channel according to the channel coherence bandwidth; and adjusting the number of the sub-channel according to the channel bandwidth. ;

2) adjusting the size of the linear transformation according to the signal transmission rate, that is, the number of occupied sub-channels;

3) Adjusting the mapping manner between the element symbols in the linearly transformed symbol data block and the sub-channels according to the channel quality.

Although a multi-band filter bank based multi-carrier wireless transmitter has been described above with reference to FIG. 1, this is done for clarity of description only. It should be understood that what the present invention is intended to protect is a device for reducing the peak-to-average ratio in a multi-carrier transmitter based on a multi-band filter bank, wherein the multi-carrier transmitter may include a wireless transmission device or a wired transmission device . The means for reducing the peak-to-average ratio mainly includes the above-mentioned serial-to-parallel conversion means 13 , linear conversion means 14 and multi-band shaping filter bank means 15 . Preferably, the above-mentioned control device 17 may also be included.

Fig. 3 shows a flowchart of a signal transmission method capable of reducing peak-to-average ratio in a multi-carrier wireless transmitter based on a multi-band filter bank in a mobile communication network according to the present invention.

It should be noted that the channel encoding step, digital modulation step, RF frequency conversion step and the step of transmitting a radio frequency signal via a transmitting antenna shown in FIG. 3 have no direct relationship with the purpose of the present invention, and are only used as a preferred embodiment. are described together here.

In step S101, the input data sequence {a _k , k=0, 1, 2....} is channel-coded using a predetermined channel coding rule, and transformed into a channel-coded data sequence {b _k , k=0, 1, 2....}, where the channel coding rules can be concatenated codes composed of RS codes and convolutional codes, Turbo codes, or LDPC codes, or can be self-contained codes composed of multiple technologies Adapt to a coding scheme, such as an adaptive coding and modulation scheme (AMC), then proceed to step S102;

In step S102, for example, according to the Gray coding specification, the channel-coded data sequence {b _k , k=0, 1, 2...} is mapped to the dot matrix of the modulation symbol to generate a digitally modulated mapped The serial symbol sequence {d _k , k=0, 1, 2...}, the selected modulation method is determined by the system design, it can be determined as one of BPSK, QPSK, QAM modulation methods, or it can be based on Multiple dynamic modulation methods adaptively selected for bit error rate and carrier-to-interference ratio;

In step S103, the serial symbol sequence {d _k , k=0, 1, 2....} obtained by digital modulation mapping is subjected to serial-to-parallel conversion according to the size of the subsequent FFT transformation matrix to generate a corresponding number of parallel symbol data blocks {e _k , k=0, 1, 2....}, where e _k represents a column vector with the same element quantity and FFT transformation size, and then proceeds to step S104;

In step S104, it is used to linearly transform each input parallel symbol data block {e _k , k=0, 1, 2....} to generate a linearly transformed parallel symbol data block {f _k , k=0,1,2,L}, here, f _k also represents a column vector with the same size as the linear transformation, and the linear transformation is preferably an orthogonal linear transformation, such as Fourier (DFT) transform or inverse Fourier ( IDFT) transformation (preferably, can be realized by FFT transformation module or IFFT transformation module). Wherein, the size of the linear transformation, that is, the size of the column vector of the transformation matrix, depends on the number of sub-bands (sub-channels) occupied by the transmitted signal, and then proceed to step S105;

In step S105, each element symbol in the column vector of the parallel symbol data block {f _k , k=0, 1, 2, L} obtained through linear transformation is mapped to a plurality of mutually orthogonal (quasi-normal cross) on the sub-channel. Generally, the number of sub-channels can be much larger than the number of input signal paths. Preferably, the number of sub-channels is an integer power of 2 (that is, 2, 4, 8, 16...); and, the size of the linear transformation is selected so that the number of sub-channels is the size of the linear transformation Integer multiple; at the same time, ensure that each element symbol in the column vector output by the linear transformation is mapped to the sub-channels of the filter bank at equal intervals according to the sub-channel numbers. Figure 2 exemplifies two mapping methods between the element symbols in the column vector of the parallel symbol data block output by the linear transformation and the subchannels when the number of subchannels is 16 and the size of the linear transformation (such as FFT transformation) is 4. As shown in the figure, as long as the equal interval mapping is guaranteed, the mapping method between the column vector element symbols output by the FFT transformation and the subcarriers may not be unique. After sub-channel filtering and mapping, the output signals of all sub-channels are linearly added to form an output signal, thus, the input symbol sequence {f _k , k=0, 1, 2, L} is transformed into an output waveform sequence {i _k , k=0,1,2,L};

In step S106, up-convert the waveform sequence {i _k , k=0, 1, 2, L}, which is the baseband symbol sequence and has been filtered and mapped by the sub-channel, into a radio frequency signal;

Subsequently, in step S107, the radio frequency signal is transmitted into the wireless channel via the transmitting antenna module.

Preferably, the method also includes the following control steps:

1) Adjusting the bandwidth of the sub-channel according to the channel coherence bandwidth; and adjusting the number of the sub-channel according to the channel bandwidth. ;

2) adjusting the size of the linear transformation according to the signal transmission rate, that is, the number of occupied sub-channels;

3) Adjusting the mapping manner between the element symbols in the linearly transformed symbol data block and the sub-channels according to the channel quality.

Although the signal transmission method in the multi-carrier wireless transmitter based on the multi-band filter bank in the mobile communication network has been described above with reference to FIG. 3 , this is only for clarity of description. It should be understood that what the present invention is intended to protect is a method for reducing the peak-to-average ratio in a multi-carrier transmitter based on a multi-band filter bank, wherein the multi-carrier transmitter may include a wireless transmitter or a wired transmitter device. The method for reducing the peak-to-average ratio mainly includes the above steps S103, S104 and S105. Preferably, the above control steps 1)-3) may also be included.

FIG. 4 is a block diagram of a multi-band filter based multi-carrier wireless receiver 2 for receiving signals transmitted by the wireless transmitter shown in FIG. 1 in a mobile communication network according to an embodiment of the present invention.

Wherein, the wireless receiver 2 includes a matched filter bank device 20, one or more channel estimation devices (for the sake of simplicity in Fig. 4, only two channel estimation devices 21 and 23 are shown, corresponding to the matched filter bank device respectively one output), one or more equalization devices (for the sake of simplicity in Fig. 4, only two equalization devices 22 and 24 are shown, which correspond to one output of the matched filter bank device), a linear inverse transformation device 25 , a parallel/serial conversion device 26, a symbol demodulation device 27 and a channel decoding device 28.

Wherein, for the sake of simplicity, the parts of the wireless receiver 2 that are not directly related to the present invention only show the digital demodulation device, the channel decoding device, the channel estimation device and the equalization device. The receiving antenna for receiving wireless signals, the radio frequency conversion device for down-converting wireless signals to baseband, and the synchronization device for synchronizing received signals are not shown in the figure.

Assuming that the receiver is ideally synchronized, the wireless receiver 1 can obtain a baseband signal {y _k , k=0, 1, 2, L} through the receiving antenna and the RF module;

The matched filter bank device 20 completes the inverse operation of matching with the signal shaping filter bank device at the transmitting end, and is used to separate each modulation symbol sequence from the baseband signal {y _k , k=0, 1, 2, L} . Since the processing process of each modulation symbol sequence is the same, in order to simplify the analysis, the following channel estimation device 21 and equalization device 22 only focus on the output modulation symbol sequence {l _k , k=0, 1, 2, L} The processing process of the other channels is described, and the processing process of the modulation symbol sequences output by other channels is the same and parallel processing;

The channel estimation device 21 is used to estimate the sub-channel response in the time domain, so as to obtain the estimated value {w _k , k=0, 1, 2, L L-1} of the sub-channel response, where L is the sub-channel in the time domain The maximum delay of the response;

The _equalization device 22 is used to perform an output symbol sequence {l _k , k=0 , 1, 2, L} for equalization operation. The equalized output data sequence is {p _k , k=0, 1, 2, L}.

The linear inverse transform device 25 is used to perform an inverse operation (linear inverse transform) corresponding to the linear transform of the transmitting end on each equalized symbol data sequence {p _k , k=0, 1, 2, L}, to output the A linearly transformed parallel symbol data block sequence {q _k , k=0, 1, 2, L}, where q _k represents a column vector whose number of elements is the same as that of the linear transformation;

The parallel-to-serial conversion device 26 is used to perform parallel-to-serial conversion on the parallel symbol data block sequence {q _k , k=0, 1, 2, L} after linear inverse transformation to generate a serial symbol data sequence {t _k , k=0,1,2,L};

The digital demodulation device 27 is used to demodulate the serial symbol data sequence {t _k , k=0, 1, 2, L} according to the decoding rule corresponding to the Gray coding rule at the transmitter end, to generate a corresponding A sequence of numbers {u _k , k=0, 1, 2, L}. If the channel decoding algorithm to be executed is based on hard decision input information, the output hard information digital sequence is a random arrangement of {0} and {1}, otherwise, the corresponding soft information digital sequence based on digital bit quantization will be output;

The channel decoding means 28 is used to perform channel decoding on the digital sequence { _uk , k=0, 1, 2, L} according to the decoding rule corresponding to the channel coding rule of the transmitter, so as to generate the channel Decoded digital sequence {v _k , k=0, 1, 2, L}.

Although a filter bank based multi-carrier wireless transmitter 2 in a mobile communication network has been described above with reference to Fig. 4, this is done for clarity of description only. It should be understood that what the present invention is intended to protect is a device for receiving and receiving a transmission signal that performs peak-to-average ratio reduction operations at the transmitter end according to the present invention in a multi-carrier receiver based on a multi-band filter bank, wherein , the multi-carrier transmitter and receiver may include wireless or wired transmitting and receiving devices. The device for receiving the transmission signal with peak-to-average ratio reduction operation at the transmitter mainly includes the above-mentioned matched filter bank device 20 , linear inverse conversion device 25 and parallel-to-serial conversion device 26 .

5 is a diagram of a method for receiving a transmission signal according to the present invention in which a peak-to-average ratio reduction process is performed at the transmitter end in a multi-carrier wireless receiver based on a multi-band filter bank in a mobile communication network according to a specific embodiment of the present invention flow chart.

Wherein, for the sake of simplicity, the parts of the receiving method that are not directly related to the present invention only show the steps of symbol demodulation, channel decoding, channel estimation and equalization. The steps for receiving wireless signals through the antenna, the steps for down-converting wireless signals to baseband and the synchronization steps for synchronizing received signals are not shown in the figure.

Assuming that the receiver 2 is ideally synchronized, the wireless receiver 2 can obtain a baseband signal {y _k , k=0, 1, 2, L} through the receiving antenna and the RF radio frequency module;

In step S201, an inverse operation matching the channel filter mapping of the transmitting terminal is performed on the baseband signal {y _k , k=0, 1, 2, L}, for obtaining from the baseband signal {y _k , k= 0, 1, 2, L} to separate each modulation symbol sequence. Since the processing of each modulation symbol sequence is the same, in order to simplify the analysis, in the following steps S202 and S203, only the processing of one of the modulation symbol sequences { _lk , k=0, 1, 2, L} is carried out Description, the processing process of the modulation symbol sequences output by other channels is the same and parallel processing, and then proceed to step S202;

In step S202, the sub-channel response is estimated in the time domain, so as to obtain the estimated value {w _k , k=0, 1, 2, L L-1} of the sub-channel response, where L is the sub-channel response in the time domain the maximum delay;

In step S203, based on the estimated channel response {w _k , k=0, 1, 2, LL-1} provided in step S202 above, the modulation symbol sequence { _lk , k=0, 1, 2, L} to perform an equalization operation to output an equalized symbol data sequence {p _k , k=0, 1, 2, L}, and then proceed to step S204;

In step S204, the inverse operation (inverse linear transformation) corresponding to the linear transformation at the transmitting end is performed on each equalized symbol data sequence {p _k , k=0, 1, 2, L} to output the linear inverse Transformed parallel symbol data block sequence {q _k , k=0, 1, 2, L}, where q _k represents a column vector with the same size as the number of elements and the linear inverse transformation, and then proceeds to step S205;

In step S205, parallel-to-serial conversion is performed on the parallel symbol data block sequence {q _k , k=0, 1, 2, L} after linear inverse transformation to generate a serial symbol data sequence {t _k , k =0,1,2,L}, proceed to step S206 subsequently;

In step S206, the serial symbol data sequence {t _k , k=0, 1, 2, L} is demodulated according to the decoding rule corresponding to the Gray coding rule at the transmitter to generate the corresponding digital Sequence {u _k , k=0, 1, 2, L}. If the channel decoding algorithm to be executed is based on hard decision input information, the output hard information digital sequence is a random arrangement of {0} and {1}, otherwise, the corresponding soft information digital sequence based on digital bit quantization will be output, and then Proceed to step S207;

In step S207, channel decoding is performed on the digital sequence {u _k , k=0, 1, 2, L} according to the decoding rule corresponding to the channel coding rule at the transmitter to generate a channel-decoded The sequence of numbers {v _k , k=0, 1, 2, L}.

Although the method for receiving the transmission signal of the peak-to-average ratio reduction process at the transmitter end according to the present invention in a multi-carrier wireless receiver based on a multi-band filter bank in a mobile communication network has been described above with reference to FIG. 5 , this is only For clarity of description. It should be understood that what the present invention is intended to protect is a method for receiving a transmission signal that performs peak-to-average ratio reduction operations at the transmitter end according to the present invention in a multi-carrier receiver based on a multi-band filter bank, wherein, The multi-carrier transmitter and receiver may include wireless or wired transmitting and receiving means. The device for receiving the transmission signal on which the peak-to-average ratio reduction operation is performed at the transmitter mainly includes the above steps S201, S204 and S205.

6 and 7 show diagrams of the peak-to-average ratio complementary cumulative distribution function (CCDF) of a multi-carrier system based on a multi-band filter bank using the present invention. As can be seen from Fig. 4, when QPSK modulation is adopted, for the multi-carrier system of direct mapping, the peak-to-average ratio of 1% of the transmission symbols exceeds 8.3dB; The peak-to-average ratio is 5dB, and the peak-to-average ratio is only 2.5dB when using equal interval mapping, which is basically the same as the peak-to-average ratio of the single-carrier system (transmission system using one sub-filter). As can be seen from Fig. 5, when 16QAM modulation is adopted, under the above-mentioned same probability conditions, the peak-to-average ratio of the non-equal interval mapping of the present invention is about 3dB lower than that of the directly mapped multi-carrier system, while the peak-to-average ratio of the equidistant mapping is It is about 1.5dB lower than the non-equally spaced peak-to-average ratio, and only about 1dB higher than the single-carrier system.

Set system simulation parameters:

Filter Bank Base Filter: Root Raised Cosine Filter

Total number of filter bank subbands: 16

FFT size (number of subbands used): 8

Modulation method: QPSK/16QAM

Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the appended claims.

Claims (22)

1. A method for reducing the peak-to-average ratio in a multi-carrier transmitting device based on a multi-band filter bank, comprising the steps of: Serialize the input sequence of serial symbolic data into a sequence of parallel symbolic data blocks; Performing linear transformation on the parallel symbol data block sequence according to the order of generation to generate a linearly transformed symbol data block sequence, so as to make the modulation signals on each subcarrier in the multi-carrier transmission signal have a certain correlation; Using each sub-filter in the multi-band filter bank to map the element symbols in each of the linearly transformed symbol data blocks to corresponding sub-channels, wherein each sub-filter corresponds to a Sub-channels, where the sub-channels are arranged in the order of their corresponding frequencies. 2. The method of claim 1, wherein, The linear transformation is an orthogonal linear transformation. 3. The method of claim 2, wherein, The orthogonal linear transform is discrete Fourier transform or inverse discrete Fourier transform. 4. The method according to any one of claims 1-3, characterized in that, The step of respectively mapping the element symbols in each of the linearly transformed symbol data blocks to the corresponding sub-channels is: mapping the element symbols to the corresponding sub-channels at equal intervals in the order of the sub-channels. 5. The method according to any one of claims 1-3, further comprising the steps of: adjusting the bandwidth of the subchannel according to the channel coherence bandwidth, The number of sub-channels is adjusted according to channel bandwidth. 6. The method according to claim 5, further comprising the steps of: The linear transform is sized according to the signaling rate. 7. The method according to claim 5, further comprising the steps of: Adjusting the mapping manner between the element symbols in the linearly transformed symbol data block and the sub-channels according to the channel quality. 8. An apparatus for reducing peak-to-average ratio in a multi-band filter bank based multi-carrier transmitter, comprising: A serial-to-parallel conversion device for serial-to-parallel conversion of the input serial symbol data sequence to a parallel symbol data block sequence; A linear transformation device, used to linearly transform the parallel data block sequence in the order of generation to generate a linearly transformed symbol data block sequence, so that the modulation signals on each subcarrier in the multi-carrier transmission signal have a certain correlation; A multi-band shaping filter bank device, which includes a plurality of sub-filters, each of which corresponds to a sub-channel, wherein the sub-channels are arranged in sequence according to their corresponding frequencies, Wherein, each sub-filter is used to map corresponding element symbols in the linearly transformed symbol data block to corresponding sub-channels. 9. The device of claim 8, wherein: The linear transformation is an orthogonal linear transformation. 10. The transmitting device according to claim 9, characterized in that, The orthogonal linear transform is discrete Fourier transform or inverse discrete Fourier transform. 11. The device according to any one of claims 8-10, characterized in that, The shaping filter bank device is further configured to map the element symbols to corresponding sub-channels at equal intervals in the order of the sub-channels. 12. The device according to any one of claims 8-10, further comprising a control means for adjusting the bandwidth of the sub-channels according to the channel coherence bandwidth; and adjusting the number of the sub-channels according to the channel bandwidth. 13. The device of claim 12, wherein: The control means is also used to adjust the transform size of the linear transform means according to the signal transmission rate. 14. The apparatus of claim 12, wherein: The control device is further configured to adjust a mapping manner between element symbols in the linearly transformed symbol data block and the sub-channels according to channel quality. 15. A method for receiving a signal with a reduced peak-to-average ratio in a multi-carrier receiving device based on a multi-band filter bank, comprising the steps of: performing an inverse operation corresponding to the sub-channel filtering and mapping operation at the transmitter end on the input symbol signal to separate the multi-channel symbol data sequence; Perform linear inverse transformation corresponding to the linear transformation at the transmitter end on the multi-channel symbol data sequence to generate a linear inverse transformed symbol data block sequence, wherein the linear transformation is used to make each subcarrier in the multi-carrier transmission signal There is a certain correlation between the up-modulated signals; Parallel-to-serial conversion is performed on the sequence of symbol data blocks subjected to linear inverse transformation in order to generate a sequence of serial symbol data. 16. The method according to claim 15, further comprising the steps of: The response of each subchannel is estimated in the time domain to obtain an estimate of the subchannel response. Based on the estimated channel response value of each sub-channel, an equalization operation is performed on a corresponding symbol data sequence to generate an equalized symbol data sequence, which is provided to the linear inverse transform step. 17. The method of claim 15 or 16, wherein The linear transformation is an orthogonal linear transformation. 18. The method of claim 17, wherein, The orthogonal linear transform is discrete Fourier transform or inverse discrete Fourier transform. 19. A multi-carrier receiving device based on a multi-band filter bank for receiving a signal with a reduced peak-to-average ratio, comprising: A matched filter bank device for performing an inverse operation corresponding to the sub-channel filter mapping operation at the transmitter end on the input symbol signal, so as to separate the multi-channel symbol data sequence; A linear inverse transform device, configured to perform a linear inverse transform corresponding to the linear transform at the transmitter end on the multi-channel symbol data sequence, so as to generate a linear inverse transformed symbol data block sequence, wherein the linear transform is used to make There is a certain correlation between the modulated signals on each subcarrier in the multi-carrier transmission signal; A parallel-to-serial conversion device, configured to perform parallel-to-serial conversion on the sequence of symbol data blocks subjected to linear inverse transformation in order of generation, so as to generate a serial symbol data sequence. 20. The apparatus of claim 19, further comprising: A channel estimation device, configured to estimate the response of each sub-channel in the time domain to obtain an estimated value of the sub-channel response; The equalization device is configured to perform an equalization operation on a corresponding symbol data sequence based on the estimated channel response value of each sub-channel to generate an equalized symbol data sequence, which is provided to the linear inverse transform device. 21. Apparatus according to claim 19 or 20, characterized in that, The linear transformation is an orthogonal linear transformation. 22. The device of claim 21, wherein: The orthogonal linear transform is discrete Fourier transform or inverse discrete Fourier transform.

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