频率选择性衰落信道SFH/GMSK误码性能分析

Analysis of BER performance for SFH/GMSK in frequency-selective slow fading channel

针对存在频偏和频率选择性的慢衰落信道,分析给出了1比特差分相位检测SFH/GMSK系统的误码率闭式解;在此基础上,研究了载波噪声比、载波延迟比与误码率的关系,探讨了高载波噪声比下频偏和跳频速率对误码率的影响;利用Monte Carlo仿真验证了闭式解的准确性。研究表明:信道特性和跳频速率显著影响误码性能,频率偏移与误码率之间近似存在"门限效应"。

Aiming to the slow fading channel which consists of frequency selectivity and carrier frequency offset （CFO）, the closed-form expression for the BER, which is derived from one-bit differential phase detection （1-DPD） SFH/GMSK communication system, is obtained. Furthermore, the relationships between the BER and the carrier-noise ratio, the BER and the carrier-delay ratio are studied. With high carrier-noise ratio, the impairments on the BER which are caused by CFO and the frequency hop （FH） speed are also researched. Finally, Monte Carlo simulation results show that the closed-form expression is accurate. These researches illustrate that multipath fading and the FH speed affect the BER performance seriously and there is an approximate ＂gate effect＂ between CFO and the BER.