结合功率分配的干扰对齐预编码优化算法

针对K用户多输入多输出干扰信道系统提出了一种基于功率分配预编码优化算法.首先通过信道的奇异值分解，基于矩阵弦距离，选出一组与最好的特征子信道最为匹配的预编码矩阵来传输信号，然后根据信道矩阵信息的强弱进行功率分配，从而对预编码矩阵进行优化，可最大化保证接收信号的强度.仿真结果表明，该算法未用迭代计算预编码矩阵和接收抑制矩阵，不仅使整个系统的复杂度大大降低，而且在系统和速率有微小损失的情况下，提高了系统的误码率性能.

Interference Alignment Precoding Optimization Algorithm Based on Power Allocation

The interference alignment is a transmission technology which aligns interference signal from other transmitters to the same signal subspace for reducing the interference to the desired signal. In recent years this technology has been widespread concerned. An interference alignment precoding optimization algorithm based on power allocation was proposed for the K user multiple input multiple output ( MIMO) interference channel system. First, the signal is transmitted according to the best matching of the precod-ing matrix with the best feature sub channel based on the chord distance matrix by the singular value de-composition of the channel. Then the power allocation is assigned according to the channel matrix strength and also the precoding matrix is optimized. This method can ensure the signal strength maximally. Fur-thermore, the proposed algorithms calculate the precoding matrix and the receiver inhibition matrix with-out iteration. Simulation shows that this method not only reduces the complexity of the system, but also improves the bit error rate ( BER) performance.