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正交频分复用技术(OFDM,Orthogonal Frequency Division Multiplexing)是一种有效的并行多载波传输方案,然而,OFDM技术存在一个主要缺点,即发送信号存在较高的峰值平均功率比(PAPR,Peak-to-Average Power Ratio)。研究表明高带宽效率的限幅类技术着眼于直接降低OFDM信号的峰均比,而幅度和相位预失真方法则是从放大器的角度出发,对放大器进行预失真处理,增大功率放大器的线性范围。这里提出将限幅类技术和预失真处理进行联合实现,从而在系统PAPR减小、失真补偿和误码率之间取得较好的折中。
Orthogonal Frequency Division Multiplexing (Orthogonal Frequency Division Multiplexing) is an effective parallel multi-carrier transmission scheme. However, there is a major drawback of the OFDM technique in that the transmitted signal has a high peak-to-average power ratio (PAPR, Peak -to-Average Power Ratio). Research shows that the high-bandwidth-efficiency clipping technique focuses on reducing the peak-to-average ratio of OFDM signals directly, while the amplitude and phase predistortion methods pre-distort the amplifier from the perspective of the amplifier to increase the linear range of the power amplifier . Here we propose to limit the type of technology and pre-distortion processing joint implementation, thus reducing the system PAPR, distortion compensation and bit error rate achieved a good compromise.