含公零点SIMO信道QPSK序列盲检测  

QPSK blind sequence detection of SIMO channels with common zeros

作　　者：于舒娟[1] 张志涌[1] 

机构地区：[1]南京邮电学院电子工程系,南京210003

出　　处：《东南大学学报（自然科学版）》2005年第6期867-871,共5页Journal of Southeast University：Natural Science Edition

基　　金：国家自然科学基金资助项目(60172058)

摘　　要：在QPSK字符集下导出了与传统迫零均衡准则有本质不同的ε-均衡准则,并证明了ε-均衡器存在的充分及必要条件.给出了基于ε-均衡准则的QPSK序列盲检测算法,该算法将QPSK序列盲检测问题转化为带整数约束的二次规划问题.采用具有多项式近似复杂度的ε近似算法解决带整数约束的二次规划问题.仿真结果表明,该算法能够有效地适用于含公零点的单输入多输出信道,并对信道阶具有稳健性,无论信道是否包含公零点,该算法误码性能都明显优于基于二阶统计量的其他经典算法.The ε-equalization principle which is different from the conventional zero-forcing equalization is deduced based on the quadrature phase shift keying （QPSK） alphabet. The necessary and sufficient condition of the existence of the ε-equalizer is proved. A QPSK blind sequence detection algorithm based on the ε-equalization principle is proposed. The algorithm can formulate the quadrature phase shift keying blind sequence detection into a quadratic programming with integer constraints. Finally, the problem of quadratic programming with integer constraints is solved by utilizing ε-approximation with polynomial approximate complexity. Simulation results demonstrate that the algorithm is applicable in the single-input multiply-output channels with common zero and it is robust to the channel order. Its performance is superior to some classical approaches based on second-order statistics no matter whether single-input multiply-output channels have common zeros or not.

关 键 词：盲均衡 单输入多输出信道 公零点 QPSK 

分 类 号：TN914.53[电子电信—通信与信息系统]