临频差分调制技术研究

Research on the non-orthogonal frequency division multiplexing technology

调制技术是通信的基础。文章讨论一种在频率域进行差分处理,以提高抗干扰性能的频域差分调制技术。它采用多个频率传输一个码元,形成一个合成信号在同一个信道中传输,噪声对该信号干扰时会对多个频点作用,由于多频点信道完全相同,因此其干扰也相似,解调时可利用差分技术降低干扰影响。文章研究了2个频率相近载波的临频差分调制(Non-orthogonal Frequency Division Multiplexing,NFDM),当输入信噪比为-6 DB时,误码率约为10^(-4),与信噪比+8 DB时OFDM的误码率相似,说明NFDM有很好的抗干扰能力。

Modulation technology is the foundation of communication.This paper discusses a differential modulation technique in the frequency domain to improve anti-interference performance.It uses multiple frequencies to transmit a code to form a synthetic signal transmission in the same channel.When the noise interferes with the signal,it will act on multiple frequency points.Because the multi-frequency point channel is exactly the same,its interference is similar,and the difference can be used to reduce the interference influence.In this paper,the adjacent frequency differential modulation(NFDM)of two frequency similar carriers is studied.When the SNR is-6DB,its SER is about 10^(-4),which is similar to the OFDM SER of+8DB SNR,indicating that NFDM has good anti-interference ability.