时移非正交频分复用及其与正交频分复用的比较

arison between time shifted non-orthogonal frequency division multiplexing and OFDM

通过将时移参数引入多载波调制，形成了一种具有全新思想的时移非正交频分复用（TS-NFDM）调制技术，并通过理论分析和仿真实验将该技术的性能与当前在无线通信中扮演重要角色的正交频分复用（OFDM）技术进行了比较。比较结果表明，TS-NFDM技术具有明显的优势，其时移特性使其表现出许多优良的性能，其中最突出的是频带利用率高，约为OFDM的4．29倍，另外，信号功率的峰值均值比也明显低于OFDM。

A novel time shifted non-orthogonal frequency division multiplexing （TS-NFDM） technology is created by in- troducing the time-shift factor into multi-carrier modulation, and its performance is compared by theoretical analysis and simulation experiment with the orthogonal frequency division multiplexing （ OFDM）, an important technique in the present wireless communications. The comparison resuks show that the time-shift character brings TS-NFDM va- rieties of advantages, among which, the distinct one is its higher bandwidth efficiency, approximately 4.29 times higher than the OFDM. Moreover, its peak to average ratio in signal power, is obviously lower than the OFDM.