适用于多天线系统信道估计的周期互补多相码

针对多天线系统中的信道估计，提出了一类周期互补多相码的构造方法。该方法基于完美码集合，通过对集合中任意2个等长完美码的交织操作，可以获得一类新的具有周期互补特性的多相码。所获得的多相码具有理想的周期相关性能，即该类多相码的异相周期自相关函数和任意位移上的周期互相关函数都等于零。不同于传统的子码长度受限的周期互补二元码，所构造的周期互补多相码能够产生大于4的所有偶数子码长度，从而既可以保证系统信道估计的性能，也可以提供更加灵活的参数选择。

Periodic complementary multi phase codes for channel estimationin multiple antenna systems

A construction method of periodic complementary multi phase codes for channel estimation in multiple antenna systems was presented. The proposed scheme is based on perfect code sets. By interleaving any two perfect codes with the same length,a novel of multi phase codes with periodic complementary properties was generated.The generated multi phase codes possess such ideal periodic correlation properties,as that,both of their out of phase periodic auto correlation function and periodic cross correlation at any shift are equal to zero.Different from conventional periodic complementary binary codes with the limited sub code length, the sub code length of the constructed periodic complementary multi phase codes can be equal to all of the even numbers bigger than 4, which offers a more flexible choice of parameters and ensures the performance of channel estimation of systems.