OFDM信号峰均比抑制FPGA设计实现

Design implementation of PAPR OFDM signal suppression FPGA

正交频分复用(OFDM)技术是一种多载波调制技术,通过减小和消除码间串扰的影响来克服信道的频率选择性衰落。OFDM具有较大的峰值平均功率比,随着子载波数量的增加而显著提升,造成功率放大器的回退,它直接影响整个通信系统的运行成本和效率。采用有效的峰均比抑制方案来减小多载波输入信号的波峰因子,可明显提高功放效率,提升通信设备的系统增益,降低设备功耗等。分析研究Constrained Clipping CFR的算法,在Matlab建模仿真的基础上进行FPGA硬件实现。峰均比抑制采用FFT/IFFT变换,对信号在时域、频域分别进行处理。参考Wi MAX协议,确保削波信号的EVM、频谱模板等参数,强调算法的工程可实现性和通用性。

Orthogonal Frequency Division Multiplexing （OFDM） technology, as a multi - carrier modulation technology, overcomes the channel of frequency selective fading by reduction and elimination of ISI influence. OFDM has a larger peak to average power ratio and is significantly improved with increasing in the number of sub - carriers to result in a power amplifier back off, which directly affects the operating costs and the efficiency of the entire communication system. The effective programs are used to reduce PAPR suppression multicarrier input signal crest factor, significantly improve power amplifier efficiency and the system gain of the communications equipment, and reduce power consumption. Constrained Clipping CFR algorithms are researched and FPGA hardware is implemented based on Matlab modeling and simulation analysis. PAPR suppression, using FFT/IFFT transform, separately processes the signal in time domain and frequency one. In the reference of WiMAX agreement, clipping signal EVM, spectrum mask and other parameters are ensured, and the algorithm can be realized and universal.