Abstract: To improve the Bit Error Rate(BER) performance of Multi Input Multi Output(MIMO) X channel, this paper proposes an Interference Alignment(IA) scheme. It transmits data symbols according to Alamouti scheme at senders, and changes the operation mode of reconfigurable antennas at receivers. The final equivalent channel matrix is orthogonal, thus interference can be eliminated through matrix operation, and low complexity Partial Interference Cancellation(PIC) group decoding can be employed. Simulation results proves the validity of the scheme.

Key words: Multi Input Multi Output(MIMO), X channel, Interference Alignment(IA), Degree of Freedom(DoF), Bit Error Rate(BER)

摘要： 为提高多输入多输出(MIMO)X信道的比特误码率(BER)性能，提出一种干扰对齐方案。在发送端将数据按照Alamouti编码方案重复发送，在接收端通过重新配置天线工作模式改变信道系数，构成具有正交结构的等效信道矩阵，通过矩阵运算消除干扰，并采用低复杂度的PIC群译码算法进行译码。仿真结果验证了该方案的有效性。

关键词: 多输入多输出, X信道, 干扰对齐, 自由度, 比特误码率

CLC Number: 

• TN919.3