基于WFRFT频谱预编码的GFDM系统性能优化方法

Performance optimization method of GFDM system based on WFRFT spectral precoding

针对广义频分复用(GFDM)系统在实际应用中仍然面临着带外功率泄漏和峰均功率比较高的问题,通过深入分析频谱预编码GFDM系统功率谱特性,构建了一种基于加权分数傅里叶变换(WFRFT)的通用频谱预编码(SP)框架,提出了二维参数可调的WFRFT-SP-GFDM系统。通过参数的灵活配置,可使该WFRFT频谱预编码器逼近加权分数傅里叶变换矩阵,实现对带外功率和峰均功率比的精确控制。仿真结果表明,与GFDM和WFRFT-GFDM波形相比,WFRFT-SP-GFDM波形可以有效抑制系统带外功率泄漏,同时保持较好的峰均功率比和误码率性能。

Generalized frequency division multiplexing(GFDM)system always faces challenges related to out-of-band(OOB)power leakage and a high peak-to-average power ratio(PAPR).Through an in-depth analysis of power spectrum characteristics of spectrally precoded GFDM systems,a universal spectral precoding(SP)framework based on the weighted fractional Fourier transform(WFRFT)was established.A two-dimensional parameter-adjustable WFRFT-SP-GFDM system was introduced.By flexibly configuring the parameters,the WFRFT spectral precoder could be made to approximate the weighted fractional Fourier transform matrix,achieve precise control over OOB power and PAPR.Simulation results indicate that,when compared to conventional GFDM and WFRFT-GFDM waveforms,the WFRFT-SP-GFDM waveform effectively suppresses OOB power leakage,while maintaining favorable PAPR and bit error rate(BER)performance.