Emission method and emission system for optimization of peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) signals

Abstract

The invention discloses an emission method and an emission system for optimization of peak-to-average power ratio of OFDM (orthogonal frequency division multiplexing) signals. The emission system comprises a binary random signal generator module, a code mapping module, a subblock sequence segmentation module, a summator module and an optimal candidate OFDM signal selection module. The binary random signal generator module generates a to-be-emitted binary random signal and sends the signal to the code mapping module; the code mapping module converts the binary random signal into a binary signal sequence and sends the binary signal sequence to the subblock sequence segmentation module; the subblock sequence segmentation module divides the binary signal sequence into a plurality of subblock sequences, wherein each subblock sequence is connected with a fast Fourier inversion module, the fast Fourier inversion module of each subblock sequence in even number is connected with a phase optimization module, and the fast Fourier inversion module of a first subblock sequence is connected with an interleaving module to realize interleaving of the first subblock sequence; the summator module subjects time domain subblock sequences corresponding to all of the subblock sequences to superposition to generate all candidate OFDM signals and sends the candidate OFDM signals to the OFDM signal selection module; the OFDM signal selection module selects the candidate OFDM signal with a smallest PAPR (peak-to-average power ratio) and transmits the selected signal.

Description

technical field [0001] The invention relates to the technical field of digital communication, in particular to a transmitting system and method for optimizing the peak-to-average power ratio of OFDM signals. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology has been applied to many fields of wireless communication as a high-speed data transmission technology due to its good ability to resist frequency selective fading. However, since the OFDM signal is formed by superimposing multiple sub-carrier signals, this signal structure may cause the signal to have too high peak power, especially when the number of sub-carriers is large, this problem will be more serious. Excessive peak power will lead to a higher peak-to-average power ratio (Peak-to-Average Power Ratio, PAPR), which will lead to OFDM signal distortion and cause system performance to deteriorate. To make up for this defect, the high power amplifier (High Power Amplifier, HPA) ...

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Problems solved by technology

[0013] The purpose of the present invention is to provide a transmission system and method for optimizing the peak-to-average power ratio of OFDM signals, aiming at the shortcomings of traditional partial transmission sequence (PTS) with large computational complexity, wherein the transmission system has low computational complexity and peak-to-average power ratio. The power ratio (PAPR) performance is good and can meet the characteristics of practical application requirements

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