论文标题
较低分辨率的纯度DAC和主动星座扩展
Massive MIMO Precoding and Spectral Shaping with Low Resolution Phase-only DACs and Active Constellation Extension
论文作者
论文摘要
在算法方法以及较大的系统性能方面，在多用户大量多输入多输出（MIMO）系统中共同考虑非线性预编码和脉冲成型。研究了两个设计标准：带有主动星座扩展（ACE）和符号错误率（SER）的平均{平方}误差（MSE）。这两种公式都是根据广义近似消息传递（GAMP）算法的修改版本解决的。此外，理论性能结果是根据GAMP算法的状态演化分析得出的。基于MSE的技术将扩展到对频率选择通道的共同执行空中（OTA）光谱形状和预编码，其中光谱性能在发射机和接收器处表征。模拟和分析结果表明，基于MSE的方法在未编码的Ser方面产生与基于SER的公式相同的性能。分析结果可提供良好的性能预测至中等SNR。与标准线性方法相比，从提出的组合脉冲成型和预编码方法中获得了检测和光谱性能的实质性改进。
Nonlinear precoding and pulse shaping are jointly considered in multi-user massive multiple-input multiple-output (MIMO) systems with low-resolution D/A-converters (DACs) in terms of algorithmic approach as well as large system performance. Two design criteria are investigated: the mean {squared} error (MSE) with active constellation extension (ACE) and the symbol error rate (SER). Both formulations are solved based on a modified version of the generalized approximate message passing (GAMP) algorithm. Furthermore, theoretical performance results are derived based on the state evolution analysis of the GAMP algorithm. The MSE based technique is extended to jointly perform over-the-air (OTA) spectral shaping and precoding for frequency-selective channels, in which the spectral performance is characterized at the transmitter and at the receiver. Simulation and analytical results demonstrate that the MSE based approach yields the same performance as the SER based formulation in terms of uncoded SER. The analytical results provide good performance predictions up to medium SNR. Substantial improvements in detection, as well as spectral performance, are obtained from the proposed combined pulse shaping and precoding approach compared to standard linear methods.
