基于FQPSK调制的盲均衡算法  

FQPSK-Based Blind Equalization Algorithm

作　　者：向元伟 彭卫东[2] 尚耀波[2] 林思铭[1,2] 

机构地区：[1]空军工程大学装备管理与安全工程学院,西安710051 [2]空军工程大学综合电子信息系统与电子对抗技术研究中心,西安710051

出　　处：《火力与指挥控制》2017年第10期114-117,123,共5页Fire Control & Command Control

基　　金：国家自然科学基金(61401499);航空科学基金资助项目(20110196004)

摘　　要：针对低空航空信道多普勒、多径等衰落现象严重的问题,通过研究判决反馈盲均衡结构有效克服多径效应影响;超指数迭代算法收敛速度快,运算复杂度较低,修正的超指数算法还具有相位相关信息,可以纠正星座图相位旋转,减小稳态均方误差,加快收敛速度,降低误码率;结合FQPSK调制包络恒定,能量谱集中,抗多径的优点,提出一种基于FQPSK调制的超指数迭代盲均衡算法。仿真结果表明:在低空多径航空信道环境中,新算法可以很好地对多径信道进行跟踪并补偿,降低误码率,同基于QPSK调制的超指数迭代盲均衡算法相比,抗干扰性能明显加强。For the Doppler aeronautical channels and multipath fading problem,a blind equalizerbased on decision feedback structure is studied to efficiently combat the effects of multipath fading.Super-exponential iteration algorithm convergence speed,low computation complexity,the modifiedindex algorithm also has the phase information,can correct the constellation diagram phase rotation,reduce the steady state mean square error,speed up the convergence speed,reduce the bit error rate.The modulation of FQPSK has the feature of constant envelope,concentrated energy spectrum andanti-multipath. This paper proposes a blind equalizer based on the modulation of FQPSK. Thesimulation results show that the proposed blind equalizer may not only track and compensate themultipath channels,and reduce the bit error rate. The new method has better advantage of anti-interference ability compared with the blind equalization based on the modulation of QPSK.

关 键 词：多径信道 盲均衡 FQPSK QPSK 超指数 

分 类 号：TN929.5[电子电信—通信与信息系统]