We consider a distributed antenna system where $L$ antenna terminals (ATs)are connected to a Central Processor (CP) via digital error-free links offinite capacity $R_0$, and serve $L$ user terminals (UTs). This system modelhas been widely investigated both for the uplink and the downlink, which areinstances of the general multiple-access relay and broadcast relay networks. Inthis work we focus on the downlink, and propose a novel downlink precodingscheme nicknamed "Reverse Quantized Compute and Forward" (RQCoF). For thisscheme we obtain achievable rates and compare with the state of the artavailable in the literature. We also provide simulation results for a realisticnetwork with fading and pathloss with $K > L$ UTs, and show that channel-baseduser selection produces large benefits and essentially removes the problem ofrank deficiency in the system matrix.
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机译：我们考虑一种分布式天线系统，其中$ L $天线终端（AT）通过有限容量$ R_0 $的数字无错链路连接到中央处理器（CP），并为$ L $用户终端（UT）服务。对于一般的多址中继和广播中继网络的实例，已经针对上行链路和下行链路对该系统模型进行了广泛研究。在这项工作中，我们着重于下行链路，并提出了一种新的下行链路预编码方案，昵称为“反向量化计算和转发”（RQCoF）。对于此方案，我们获得了可达到的比率，并与文献中的现有技术进行了比较。我们还提供了具有$ K> L $ UT且具有衰落和路径损耗的现实网络的仿真结果，并表明基于信道的用户选择产生了很大的好处，并且基本上消除了系统矩阵中秩不足的问题。
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