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A low complexity user grouping based multiuser MISO downlink precoder

机译:基于低复杂度用户分组的多用户MISO下行链路预编码器

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摘要

We consider low complexity precoding for the Multiple Input Single Output (MISO)Gaussian Broadcast channel with $N_t$ antennas at the base station and $N_u$ singleantenna users in the downlink. Theoretical studies have suggested high throughputcommunication with increasing spatial dimensions i.e., $\min(N_t,N_u)$.Nevertheless, most modern communication standards are unable to exploitthe spatial dimension fully, since they are restricted to orthogonal communicationtechniques like TDMA/FDMA (Time/Frequency Division Multiplexed Access) which areknown to be sub-optimal.This restriction is mostly due to the prohibitive complexity of optimal/near-optimalprecoding schemes.On the other hand low complexity techniques like Zero Forcing (ZF) and MMSE have poor sum rate performance.In this paper, we propose a novel low-complexity user grouping based precoding scheme whichschedules all users on the same time-frequency resource (i.e., optimal utilization of resources).The proposed precoder is analytically shown to achieve a sum rate performance significantly better than the ZF precoderat similar complexity.Through simulations, it is also observed to achieve a significant fractionof the sum rate achieved by the optimal schemes.
机译:我们考虑在基站使用$ N_t $天线,在下行链路使用$ N_u $个单天线用户的多输入单输出(MISO)高斯广播信道的低复杂度预编码。理论研究表明,高通量通信随着空间尺寸即$ \ min(N_t,N_u)$的增加而增加。然而,大多数现代通信标准都无法充分利用空间尺寸,因为它们仅限于TDMA / FDMA(Time /频分复用访问)次优,这一限制主要是由于最佳/近乎最优的预编码方案的复杂性;另一方面,诸如零强制(ZF)和MMSE等低复杂度技术的总和速率性能很差本文提出了一种基于低复杂度用户分组的新型预编码方案,该方案将所有用户安排在相同的时频资源(即资源的最佳利用)上。与ZF预编码器相比,复杂度相似。通过仿真,还可以观察到总和的很大一部分最优方案实现的速率。

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