恒模复调制引入循环平稳理论在多用户信道盲估计中的应用

利用循环频率域信号处理的理论提出了新颖的恒模复调制方法,对于每个用户在循环频率域引入两个支撑点。根据各个用户的循环域的支撑不同,可以分离出各个用户的两个循环统计量。从理论上说可以彻底地消除多用户干扰和噪声的影响。利用循环谱分解和单个用户小规模子空间方法,可以辨识出不同的用户在不同的传感器上的信道。适合于多用户上行链路信道。文中对于引入循环平稳的理论和信道可辨识性都进行了详细的证明,提出了辨识算法,并对算法进行了模拟。

Multiuser Channel Estimation Based on Complex Modulation-Induced Cyclostationarity

In this paper,a novel Constant-Modulus Complex Modulation is presented based on signal processing in the cyclic domain,which can introduce two supporting points in cyclic domain for each user's signal.Based on the fact that each user has distinct support in the cyclic domain,we can separate the Second-Order Cyclic Statistics for each user.The approach can in principle exterminate the influence of multi-user interference and noise.By means of the factorization of the cyclic spectrum and the single-user subspace method,the blind estimation of the channel can be achieved.The approach is suitable for the multi-user uplink.The cyclo-stability and the channel identification are derived and proved in detail in the paper.Also the simulation of identification algorithm is given.