Wireless orthogonal frequency division multiplexing (OFDM) signal peak-to-average ratio inhibition method based on amplitude distribution variation

Abstract

The invention discloses a wireless orthogonal frequency division multiplexing (OFDM) signal peak-to-average ratio inhibition method based on the amplitude distribution variation, which mainly solves the problem of high peak-to-average ratio of the transmission signal in the prior art. The wireless OFDM signal peak-to-average ratio inhibition method based on the amplitude distribution variation comprises the following implementation steps: (1) carrying out oversampling after a quadrature amplitude modulation signal vector is subjected to serial-to-parallel transform; (2) carrying out inverse fast Fourier transform to the oversampled signal to obtain an original OFDM signal; (3) building a companding function on the basis of an amplitude distribution variation target, carrying out companding variation to the original OFDM signal, and emitting after parallel-to-serial transform; (4) calculating an emission signal peak-to-average ratio; (5) after a received signal is subjected to the serial-to-parallel transform, carrying out de-companding variation and fast Fourier transform; (6) after the fast Fourier transform signal is de-oversampled, obtaining an OFDM demodulation signal; and (7) calculating an error rate after the OFDM demodulation signal is subjected to parallel-to-serial transform and quadrature amplitude demodulation. According to the wireless OFDM signal peak-to-average ratio inhibition method based on the amplitude distribution variation, the peak-to-average ratio characteristics of the OFDM signal are effectively improved, the error rate performance of a system can be obviously improved, and the wireless OFDM signal peak-to-average ratio inhibition method based on the amplitude distribution variation can be widely applied to a new-generation broadband wireless OFDM communication system.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, relates to a peak-to-average ratio (PAPR) suppressing method of orthogonal frequency division multiplexing OFDM modulated wireless transmission signals, and can be widely applied to various new-generation broadband OFDM wireless communication systems. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a typical multi-carrier modulation technology. Its basic principle is to convert high-speed data streams into several orthogonal narrowband sub-channels through serial-to-parallel conversion. Low-speed data streams transferred in parallel. The biggest advantage of OFDM technology is that it can effectively resist frequency selective fading and narrowband interference: in a single-carrier system, a single fading or interference will cause the entire communication link to fail; but in a multi-carrier system, only a small part of subcarriers will fail Und...

AI Technical Summary

Problems solved by technology

Compared with the μ-law companding method, both the exponential companding method and the trapezoidal companding method can obtain better BER performance, but when a certain BER performance requirement is met, the performance of the two companding methods The PAPR performance improvement is very limited; on the other hand, the existing companding method may seriously deteriorate the BER performance of the OFDM system while reducing the PAPR of the OFDM signal

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