FPGA realization method based on threshold vector circle-based OFDM peak-to-average power ratio reducing technique

Abstract

The invention discloses an FPGA realization method based on a threshold vector circle-based OFDM peak-to-average power ratio reducing technique. The FPGA hardware based on the threshold vector circle technique provided by the invention is realized through adoption of a lookup table method; the sampling values of adjusted constellation points are calculated in advance by MATLAB software and are stored in the ROM of an FPGA; and the data in the ROM is directly invoked according to enabling signals when the FPGA hardware is realized. According to the hardware realization method based on the lookup table method provided by the invention, the data in a lookup table is directly invoked; the hardware realization complexity is greatly reduced; the operation rate is improved; and the generated PAPR values of OFDM signals can be greatly reduced on the precise of satisfying the demand of a communication protocol for EVM indexes.

Description

technical field [0001] The invention belongs to the field of signal processing and communication systems, in particular to an FPGA implementation method based on the technique of reducing the peak-to-average ratio of a threshold vector circle OFDM signal. Background technique [0002] The rapid development of wireless communication technology has led to a surge in demand for data services, resulting in increasingly scarce spectrum resources. Non-constant envelope signals with high spectral efficiency are widely used in modern communication systems. However, the peaks of such signals are relatively high, further exacerbating the contradiction between the linearity and efficiency of the RF power amplifier. How to effectively reduce the signal peak-to-average ratio has become a key problem in OFDM communication systems. [0003] Since reducing the peak-to-average ratio of OFDM signals is of great significance to practical applications, scholars at home and abroad have achieve...

AI Technical Summary

Problems solved by technology

The signal predistortion algorithm mainly uses a nonlinear process to reduce the PAPR value near the peak or valley of the signal amplitude. It is the simplest, most direct and most widely used peak-to-average ratio reduction technology, but this type of algorithm is essentially Anything that reduces peaking by introducing signal distortion will increase EVM

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