高速卫星通信系统中的盲均衡算法研究  

Research on blind equalization algorithm in high speed satellite communication system

作　　者：李昂阳 杜伟 方天琪 LI Angyang;DU Wei;FANG Tianqi(School of Information and Electronics,Beijing Institute of Technology,Beijing 100081,P.R.China;The 28th Research Institute of China Electronics Technology Group Corporation,Nanjing 210007,P.R.China)

机构地区：[1]北京理工大学信息与电子学院,北京100081 [2]中国电子科技集团公司第二十八研究所,南京210007

出　　处：《重庆邮电大学学报（自然科学版）》2018年第2期236-242,共7页Journal of Chongqing University of Posts and Telecommunications(Natural Science Edition)

摘　　要：在卫星通信系统中,随着其信息处理速度不断提高,码间串扰的问题也日益严重,这对解调器性能造成很大影响。考虑到无线信道的时变性和随机性,引入了自适应盲均衡技术来解决该码间串扰问题,对此给出了3种盲均衡算法,即恒模算法(constant modulus algorithm,CMA)、改进的恒模算法(modified constant modulus algorithm,MCMA)和多模算法(multi-modulus algorithm,MMA)。针对不同的调制方式,从星座图,稳态误差和误码率3个方面进行了性能分析。仿真结果显示,采用自适应盲均衡技术可以降低均方误差,使得星座图变得清晰而紧凑,减小误码率,提高通信系统性能。从工程角度来看,对于8PSK,16APSK和32APSK调制,CMA算法均衡速度最快,实现复杂度最低,最适合硬件实现。对于64APSK调制,只有MMA算法对其有良好的均衡效果,故选择MMA算法完成硬件实现。With the increasing information rate of satellite communication system,the inter-symbol interference problem is becoming serious,which degrades the demodulator performance.In consideration of the time-varying and random characteristics of wireless channel,the adaptive blind equalization is introduced and three algorithms are proposed.For different modulation schemes,the CMA,MCMA and MMA are simulated in constellation,steady state error and BER.The results indicate that this technology can lower MSE,clarify constellation and decrease BER,so that the performance of communication system is improved.In view of engineering,for 8PSK,16APSK and 32APSK,the CMA is more suitable for hardware implementation which is less complex and faster.For 64APSK,only MMA has a good performance.Therefore it is chosen for hardware implementation.

关 键 词：卫星通信 码间串扰 盲均衡 恒模算法 多模算法 

分 类 号：TN911.5[电子电信—通信与信息系统]