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在高速无线数字通信系统中正交频分复用(OFDM)是一种倍受瞩目的技术,它的频谱利用率高、成本低并可以提供高速的传输速率,但其主要缺点是有较高的峰值平均功率比(PAPR)。目前已经提出了许多降低OFDM信号PAPR的方法。部分传输序列(PTS)就是其中一种有效的方法,它通过优化的各个分组来合成PA-PR较低的OFDM信号,但是它大大增加了系统运算复杂度。文中在PTS方法的基础上利用转换T来代替部分IFFT运算,在保持系统性能不变的基础上减少了系统运算次数,有效降低了系统运算复杂度。
Orthogonal Frequency Division Multiplexing (OFDM) is a highly attractive technique in high-speed wireless digital communication systems. It has high spectrum efficiency, low cost and high-speed transmission rate, but its main disadvantage is higher Peak to average power ratio (PAPR). At present, many methods for reducing the PAPR of an OFDM signal have been proposed. Part of the transmission sequence (PTS) is one of the effective methods. It synthesizes the OFDM signal with lower PA-PR by optimizing each packet, but it greatly increases the system operation complexity. Based on the PTS method, the conversion T is used to replace part of the IFFT operations, and the number of system operations is reduced while keeping the system performance unchanged, which effectively reduces the computational complexity of the system.