Sum-Rate Enhancement in Multiuser MIMO Decode-and-Forward Relay Broadcasting Channel With Energy Harvesting Relays
Sum-Rate Enhancement in Multiuser MIMO Decode-and-Forward Relay Broadcasting Channel With Energy Harvesting Relays
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DOI：
10.1109/jsac.2016.2611878
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发表时间：
2016-12
影响因子：
16.4
通讯作者：
Fatma Benkhelifa;A. Sultan-Salem;Mohamed-Slim Alouini
中科院分区：
文献类型：
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作者：
Fatma Benkhelifa;A. Sultan-Salem;Mohamed-Slim Alouini
本文研究了一种具有单源、多能量采集(EH)中继器和多目的地的多用户多输入多输出(MIMO)译码转发(DF)中继广播信道。所有的节点都配备了多个天线。中继站和目的地的EH和信息解码任务随着时间的推移而分离，这被称为时间切换方案。由于BC信道和MIMO干扰信道的和速率最大化问题很难得到最优解，多用户MIMO DF中继BC信道的端到端和速率最大化问题就更加困难。在本文中，我们建议解决一个简化的问题，其中我们在源端采用块对角化(BD)过程，并使用类似于BD方法的算法来缓解中继-目的地信道之间的干扰。为了说明我们提出的低复杂度解的相关性，我们将其与文献中所示的最小均方误差(MMSE)解进行了比较，该解等价于MIMO广播干扰信道中和速率最大化的解。我们还研究了时分多址(TDMA)解决方案，它随着时间的推移分离了从源到中继站和从中继站到目的地的所有信息传输。我们给出了数值结果，与无同频干扰情况、基于TDMA的解决方案和基于MMSE的解决方案进行了比较，表明了我们所提出的解决方案的相关性。
In this paper, we consider a multiuser multiple-input multiple-output (MIMO) decode-and-forward (DF) relay broadcasting channel (BC) with single source, multiple energy harvesting (EH) relays, and multiple destinations. All the nodes are equipped with multiple antennas. The EH and information decoding tasks at the relays and destinations are separated over the time, which is termed as the time switching scheme. As optimal solutions for the sum-rate maximization problems of BC channels and the MIMO interference channels are hard to obtain, the end-to-end sum rate maximization problem of a multiuser MIMO DF relay BC channel is even harder. In this paper, we propose to tackle a simplified problem, where we employ the block diagonalization (BD) procedure at the source, and we mitigate the interference between the relay-destination channels using an algorithm similar to the BD method. In order to show the relevance of our low complex proposed solution, we compare it with the minimum mean-square error (mmse) solution that was shown in the literature to be equivalent to the solution of the sum-rate maximization in the MIMO broadcasting interfering channels. We also investigate the time division multiple access (TDMA) solution, which separates all the information transmissions from the source to the relays and from the relays to the destinations over time. We provide the numerical results to show the relevance of our proposed solution, in comparison with the no co-channel interference case, the TDMA-based solution, and the mmse-based solution.