arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1502.00212cs.ITmath.IT
收藏

具有部分状态信息的多用户MIMO接收机

Multi-User MIMO Receivers With Partial State Information

Ahmad Gomaa, Louay M. A. Jalloul, Krishna S. Gomadam, Djordje Tujkovic, Mohammad M. Mansour

摘要:

我们考虑使用正交频分复用(OFDM)的多用户多输入多输出(MU-MIMO)系统。几种接收机被开发用于MU-MIMO传输的数据检测,其中两个用户共享相同的OFDM时间和频率资源。接收机具有关于MU-MIMO传输的部分状态信息,其中每个接收机具有MU-MIMO信道的知识,然而,共同调度的用户的调制星座是未知的。我们提出了一个联合最大似然(ML)调制分类的联合调度用户和数据检测接收机使用最大对数MAP近似。它示出的调制分类的决策度量是一个累积在一组音调的欧几里得距离计算,也使用的最大对数MAP检测器的位对数似然比(LLR)的软判决生成。一个有效的硬件实现出现,利用这种共性之间的分类和检测步骤,并导致共享的硬件资源。通过计算机模拟,比较了该接收机与几种线性接收机的链路性能。结果表明,对于Turbo码速率为$1/2$的$64$-QAM,在$1\%$误出错率(BLER)下,在零发射和接收天线相关性的情况下,所提出的接收机在信噪比(SNR)上比置零投影接收机提高了\unit [1.5] dB.然而,在高天线相关性的情况下,线性接收器方法相对于最佳接收器遭受显著损失。

英文摘要:

We consider a multi-user multiple-input multiple-output (MU-MIMO) system that uses orthogonal frequency division multiplexing (OFDM). Several receivers are developed for data detection of MU-MIMO transmissions where two users share the same OFDM time and frequency resources. The receivers have partial state information about the MU-MIMO transmission with each receiver having knowledge of the MU-MIMO channel, however the modulation constellation of the co-scheduled user is unknown. We propose a joint maximum likelihood (ML) modulation classification of the co-scheduled user and data detection receiver using the max-log-MAP approximation. It is shown that the decision metric for the modulation classification is an accumulation over a set of tones of Euclidean distance computations that are also used by the max-log-MAP detector for bit log-likelihood ratio (LLR) soft decision generation. An efficient hardware implementation emerges that exploits this commonality between the classification and detection steps and results in sharing of the hardware resources. Comparisons of the link performance of the proposed receiver to several linear receivers is demonstrated through computer simulations. It is shown that the proposed receiver offers \unit[1.5]{dB} improvement in signal-to-noise ratio (SNR) over the nulling projection receiver at $1\%$ block error rate (BLER) for $64$-QAM with turbo code rate of $1/2$ in the case of zero transmit and receiver antenna correlations. However, in the case of high antenna correlation, the linear receiver approaches suffer significant loss relative to the optimal receiver.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑