【摘要】 针对传输正交幅度调制(QAM)信号的多输入多输出(MIMO)无线通信系统中的信号间干扰问题,提出了恒模算法(CMA)和软决策(SDD)算法相结合的混合算法。该方法代价函数结构简单,精确地利用了已知信息,使得均衡后信号具有良好的误码率性能。本文采用共轭梯度法进行优化,与现在常用的梯度类算法相比较,具有快速收敛的特性。最后分别通过信道最大扭曲和收敛速度分析了该算法的可靠性和有效性,且通过计算机仿真证明了该算法的良好性能。更多还原

【Abstract】 The paper focused on the problem of intercrossing interference of signals for Multiple-Input Multiple-Output(MIMO) Systems with Quadrature Amplitude Modulation(QAM) signal.Combining Constant Modulus Algorithm(CMA) and Soft Decision-Directed(SDD) scheme,a mixture algorithm with a combination of CMA and SDD is proposed.The cost function of this method has a simple form and accurately utilizes the known information,which makes the output signal of equalizer good performance for symbol error rate.Moreover,conjugate gradient method is adopted to optimize the cost function.Compared with the gradient-type algorithm,which is usually used at present,the proposed method converges fast.Finally,maximum channel distortion and convergence speed is applied to analyze the reliability and validity of the method respectively.Computer simulation results also confirm that the proposed method has good performances.更多还原