Quantized Constant Envelope Precoding With PSK and QAM Signaling
Quantized Constant Envelope Precoding With PSK and QAM Signaling
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DOI：
10.1109/twc.2018.2873386
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发表时间：
2018-12-01
影响因子：
10.4
通讯作者：
Nossek, Josef A.
中科院分区：
文献类型：
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作者：
Jedda, Hela;Mezghani, Amine;Nossek, Josef A.
粗量化的大规模多输入多输出（MIMO）系统由于其功率效率而受到越来越多的关注。提出了一种新的预编码技术，用于在发射端采用粗量化恒包络（constant envelope，QCE）信号的下行多用户MIMO系统中抑制多用户干扰和量化失真。考虑到QCE约束的放松版本，针对每个期望的接收向量优化发射信号向量。该优化是基于最大化的安全裕度的接收机星座调制的决策阈值。由于目标函数和约束条件的线性性质，优化问题被表述为线性规划问题。仿真结果表明，在未编码的比特错误率方面的显着增益相比，现有的前述技术。
Coarsely quantized massive multiple-input multiple-output (MIMO) systems are gaining more interest due to their power efficiency. We present a new preceding technique to mitigate the multi-user interference and the quantization distortions in a downlink multi-user MIMO system with coarsely quantized constant envelope (QCE) signals at the transmitter. The transmit signal vector is optimized for every desired received vector taking into account a relaxed version of the QCE constraint. The optimization is based on maximizing the safety margin to the decision thresholds of the receiver constellation modulation. Due to the linear property of the objective function and the constraints, the optimization problem is formulated as a linear programming problem. The simulation results show a significant gain in terms of the uncoded bit error rate compared to the existing preceding techniques.