Information transmission method capable of reducing PAPR of multicarrier system
A peak-to-average power ratio, multi-carrier system technology, applied in the field of communication, can solve the problems of reducing the PAPR of the OFDM signal and the reduction of the system data transmission rate, and achieve the effect of reducing the PAPR of the OFDM signal and causing the performance loss of the bit error rate
Active Publication Date: 2015-07-22
HUAZHONG UNIV OF SCI & TECH
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[0008] Aiming at the high PAPR of the multi-carrier communication signal, and the partial transmission sequence method causes the system data transmission rate to drop while reducing the PAPR, the present invention proposes an information transmission method for reducing the PAPR of the OFDM signal. While signal PAPR, it will not affect the system data transmission rate
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[0067] Parameter description: The modulation method adopts BPSK. The code rate of the LDPC code is 0.5, and the code length is N=1008. Subcarrier digits N c =1008 OFDM system. For the PTS method, the number of groups W=4, and the value set of the phase rotation factor is {-1,1}. The number of iterative decoding of LDPC code decoder is 500 times.
[0068] Simulation results show that: on the basis of not sending part of the transmission sequence side information, the frame error rate result obtained by the present invention is basically the same as the frame error rate result obtained by the partial transmission sequence method assuming that the receiver receives the side information completely and correctly.
[0069] The transmitting end of the present invention is exactly the same as the traditional system that adopts the PTS method to reduce PAPR, so the effect of reducing the peak-to-average power ratio of OFDM signals can be achieved in the same way. The frame error ra...
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The invention discloses an information transmission method capable of reducing a PAPR (Peak to Average Power Ratio) of a multicarrier signal, which belongs to the field of communication technology of multicarrier signals. According to the method provided by the invention, at the transmitting terminal, after input data flow is subjected to LDPC (Low Density Parity Check) coding, interleaving and QPSK / QAM (Quadrature Phase Shift Keying / Quadrature Amplitude Modulation), a partial transmission sequence method is adopted to reduce the PARP, and a phase position twiddle factor is not required to be sent to a receiving terminal; and at the receiving terminal, the received signals is subjected to de-interleaving and de-modulating after being subjected to Fourier transform, a check matrix is expanded to perform LDPC decoding, the decoding word includes coding bits and phase position revolution information, so that the information bits can be correctly restored after the phase position information is extracted. The method provided by the invention can effectively reduce the PARP of OFDM (Orthogonal Frequency Division Multiplexing) signals without sending band side information, and the frequency spectrum utilization rate of the system is improved.
Description
technical field [0001] The invention belongs to the field of communication technologies, and in particular relates to wireless multi-carrier communication, such as wireless Orthogonal Frequency Division Multiplexing (OFDM) communication, in particular to a combined low-density parity-check code (LDPC) and partial transmission sequence method to reduce multi-carrier communication System peak-to-average power ratio Information transmission method in which sideband information is not transmitted. Background technique [0002] Multi-carrier communication technology, especially Orthogonal Frequency Division Multiplexing (OFDM) communication technology has been widely used in wireless communication. However, a major disadvantage of multi-carrier communication is that multi-carrier communication signals have a high peak-to-average power ratio, or peak-to-average power ratio (PAPR). Higher PAPR requires RF front-ends in communication systems, such as power amplifiers, digital-to-an...
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IPC IPC(8): H04L27/26H04L1/00
Inventor 屈代明李立
Owner HUAZHONG UNIV OF SCI & TECH