Mil - Std - 188-110 Appendix B C Communication Standard Receiver Performance Improvement Research

Short-wave system is a time-varying, multipath,fading system,thesecharacteristics will make the signal a serious inter-symbol interference (ISI),suchinterference can cause communication errors,even communication failure. Channelequalization is one of the key technologies of eliminating ISI,the high-performanceequalization algorithm is even more important in the volatile short-wave system.but theoptimized algorithm of the equalization have high complexity,in general,thecomplexity increased by the exponentially of the delay symbols.Low complexityequalizer is often associated with the distortion of performance.In recent years,iterativeequalization algorithm is an effective way to achieve a resistance ISI which can obtainthe trade-offs of the BER performance and the complexity of the optimization.In this paper,according to the characteristics of short-wave systems, we fristresearch Watterson channel to describe the short-wave system and achieve theperformance of the traditional DFE receiver equalizer,base on that,the more adaptiveiterative balancing algorithm is proposed.However, in order to meet the need of thehigh-speed, low complexity communicate system, we gradually compared severalclassic equalizer. Such as,MMSE-LE,MMSE-DFE,SFIC and Hybird-SFIC. we givesome performance and compare them based on the physical layer specifications of theappendix C of MIL-STD-188-110B standards, and Over CCIR poor channel-Wattersonchannel model.Finally, based the convergence,complexity and performance of severalalgorithms,we determine the Hybird-SFIC equalization is the better one for theMIL-STD-188-110B standard over CCIR poor channel.then we give the performanceof the Hybird-SFIC algorithm which use16QAM for further research.