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针对多天线通信系统,提出了一种将自适应波束形成(ABF)与空时块码(STBC)相结合的下行链路发射方案.首先基于STBC所产生的等效加权加性Gauss白噪声(AWGN)信道模型,求得接收平均信噪比(SNR)最大化条件下的发射端自适应波束形成权矢量.接着以常用的3大类调制方式下的误符号率(SER)上界为准则,设计出各个波束间的最优功率分配算法.该发射方案实际上是对应于信道自相关矩阵的特征波束形成,同时结合空时编码以获得分集增益,从而提高无线通信下行链路的性能.此外,基于矩生成函数(MGF)和Gauss-Chebyshev积分,还提出了一种简单而精确的数值计算方法,用来分析采用新方案的通信系统在常用调制方式下的性能.最后计算机仿真结果验证了新方案的性能优于常用的空时块码和现有相关文献上介绍的方法.
Aiming at the multi-antenna communication system, a downlink transmission scheme combining adaptive beamforming (ABF) with space-time block coding (STBC) is proposed.Firstly, based on the equivalent weighted additive Gaussian white noise (AWGN) channel model to obtain the adaptive beamforming weight vector of the transmitting end under the condition of maximizing the received average signal-to-noise ratio (SNR). Then, according to the upper bound of the symbol error rate (SER) , An optimal power allocation algorithm is designed for each beam, which is actually corresponding to the eigenbeamforming of the channel autocorrelation matrix, and combines space-time coding to obtain diversity gain, so as to improve the downlink performance of wireless communication. In addition, based on moment generation function (MGF) and Gauss-Chebyshev integral, a simple and accurate numerical calculation method is also proposed to analyze the performance of the communication system adopting the new scheme in the common modulation mode.Finally, the computer simulation result verification The performance of the new scheme outperforms the commonly used space-time block codes and the methods described in the current literature.