一种基于正交向量的极化相关衰减效应消除方法

针对双极化通信场景下正交极化信号串扰导致的解调性能恶化问题，提出了一种基于正交向量的极化相关衰减效应消除方法. 该方法通过对发送信号进行设计，利用一组正交向量分别在发射端和接收端对极化信号进行处理，达到消除极化间串扰的目的，同时在发送端利用估计的信道参数处理发送信号，进一步消除非理想信道影响. 在不改变噪声功率的基础上，实现正交极化信号的无串扰接收，有效提高接收端信号解调性能. 理论分析和仿真结果表明，极化状态调制信号的解调误码率逼近高斯信道下的理论值，相比于预补偿方法和迫零矩阵法有更好的误码率性能，仿真结果与理论推导具有较好的一致性. 本文方法能有效解决无线信道中正交极化信号间串扰，提高接收端信号解调性能.

Orthogonal vector based transmission method for polarization dependent loss effect elimination

In this paper, an orthogonal vector-based polarization-dependent loss (PDL) elimination method is proposed, which can effectively solve the problem of demodulation performance deterioration caused by crosstalk of orthogonal polarization signals in dual-polarized wireless communications. In this method, the polarization signal is processed by orthogonal vector at the transmitter and receiver side respectively to eliminate the inter-polarization interference. In addition, the impairment caused by non-ideal channel is further eliminated by using the estimated channel parameters at the transmitter. In this manner, without changing the noise power, the interference-free reception of orthogonal polarization signal is realized, and the BER performance is improved effectively. Theoretical analysis and simulation results show that when using polarization state modulation technology to modulate signals, the proposed method has better BER performance than the pre-compensation method and zero-forcing matrix method, and can reach the theoretical value under Gaussian channel. Thus, the PDL effect is effectively eliminated.