文档介绍：基于MIL-STD-188-110标准的通信波形研究
摘要
短波信道具有时变,多径,快速衰落等多种特点,使得接收到的短波信号存在严重的符号间干扰(Inter-symbol Interference,ISI),这种干扰会导致通信的错误或者严重失效。信道均衡是抑制ISI的关键技术之一,特别是在复杂多变的短波系统中,对于高性能的均衡算法的研究就更加重要。优化均衡算法具有很高的复杂度,一般而言,它是随延迟符号数成指数上升的。而一般的均衡器往往伴有很大的性能失真。近年来,迭代均衡算法作为抵抗ISI的有效实现方式,能获得误码性能及其实现复杂度的优化折中。
根据短波系统的特点,本文在经典短波Watterson信道基础上,针对特定的短波通信技术标准,即MIL-STD-188-110C中的单音道串行模式,重点研究了RLS自适应均衡算法。利用递归最小二乘法(Recursive Least Squares ,RLS)估计、跟踪时变短波信道系数。并在经典的Watterson信道下,基于MIL-STD-188-110C标准的单音道串行波形设计方案,给出了基于RLS算法的自适应均衡器的BER性能。
通过对MIL-STD-188-110C中的单音道通信模式的仿真,分析了在Watterson信道下长交织和短交织对于系统性能的影响,对后续研究打下基础。
关键词:短波系统,MIL-STD-188-110C 标准,Watterson信道,RLS均衡,ISI。
ABSTRACT
Short-wave system is a time-varying, multipath,fading system,these characteristics will make the signal a serious inter-symbol interference (ISI),such interference can munication errors ,munication failure. Channel equalization is one of the key technologies of eliminating ISI,the high-performance equalization algorithm is even more important in the volatile short-wave the optimized algorithm of the equalization have plexity,in general,plexity increased by the exponentially of the delay equalizer is often associated with the distortion of recent years,iterative equalization algorithm is an effective way to achieve a resistance ISI which can obtain the trade-offs of the BER performance and plexity of the optimization.
According to the characteristics of short-wave systems , in the classic short Watterson channel , this paper based on the specific short-munications technology standard, that MIL-STD-188-110C , focus on the RLS adaptive equalization algorithm .This paper use recursive least squares Algorithm (Recursive Least Squares, RLS) to estimate , and track the time-varying coefficients of HF channel. We give BER performance of RLS under the serial mode in MIL-STD-188-110C.
Finally,through the mode simulation of serial (single-tone) mode in MIL-STD-188-110C,this paper carefully analysed the perfor