论文标题
联合传输网络MIMO系统的顺序和增量编码器设计不完美的回程
Sequential and Incremental Precoder Design for Joint Transmission Network MIMO Systems with Imperfect Backhaul
论文作者
论文摘要
在本文中，我们提出了具有不完美的回程链路的下行链路接头（JT）网络系统的顺序和增量预码器设计。我们设计的目的是最大程度地减少子流均方形误差（MSE）的最大值，该均方误差（MSE）主导了系统的平均位错误率（BER）性能。在提议的方案中，我们首先优化了服务基站（BS）的预编码器，然后根据其参与JT的概率的降序顺序优化JT集中非服务BS的预码器。当某些BS由于即时次要回程条件较差而不得不暂时退出JT操作时，BS-WISE顺序优化过程可以改善系统性能。此外，附加BS的预码器以增量方式得出，即，固定了先前BS的顺序优化的预码器，因此附加的预编码器在Multi-BS JT操作中扮演增量。迭代算法旨在共同优化所提出的顺序和增量优化方案中每个额外BS的子流预编码和子流幂分配。模拟表明，在实际的回程链接条件下，我们的计划在BER绩效方面大大优于自主全球预编码（AGP）方案。
In this paper, we propose a sequential and incremental precoder design for downlink joint transmission (JT) network MIMO systems with imperfect backhaul links. The objective of our design is to minimize the maximum of the sub-stream mean square errors (MSE), which dominates the average bit error rate (BER) performance of the system. In the proposed scheme,we first optimize the precoder at the serving base station (BS), and then sequentially optimize the precoders of non-serving BSs in the JT set according to the descending order of their probabilities of participating in JT. The BS-wise sequential optimization process can improve the system performance when some BSs have to temporarily quit the JT operations because of poor instant backhaul conditions. Besides, the precoder of an additional BS is derived in an incremental way, i.e., the sequentially optimized precoders of previous BSs are fixed, thus the additional precoder plays an incremental part in the multi-BS JT operations. An iterative algorithm is designed to jointly optimize the sub-stream precoder and sub-stream power allocation for each additional BS in the proposed sequential and incremental optimization scheme. Simulations show that, under the practical backhaul link conditions, our scheme significantly outperforms the autonomous global precoding (AGP) scheme in terms of BER performance.
