Relay Selection for Two-Way Relaying With Amplify-and-Forward Protocols

Relay Selection for Two-Way Relaying With Amplify-and-Forward Protocols
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使用放大转发协议进行双向中继的中继选择

DOI:
10.1109/tvt.2011.2123120
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发表时间:
2011-03
影响因子:
6.8
通讯作者:
Song, Lingyang
Song, Lingyang
中科院分区:
计算机科学2区
文献类型:
--
作者:
Song, Lingyang

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在本文中,我们提出了一个中继选择放大转发(RS-AF)协议在一般双向中继网络与两个源和N个中继。在该方案中,两个源首先同时发送到所有的中继站,然后,一个具有最小的总和符号错误率(SER)的中继站将被选择广播接收到的信号回到两个源。为了便于选择过程中,我们提出了一个简单的次优最小-最大中继选择标准,其中一个单一的中继,最大限度地减少两个源节点的SER将被选择。仿真结果表明,所提出的最小-最大选择具有几乎相同的性能与最优选择具有较低的复杂度。我们还提出了一个简单的渐近SER表达式,并与传统的全参与AF中继方案进行了比较。通过仿真验证了分析结果。为了提高系统性能,在渐近SER的基础上确定源和中继之间的最优功率分配(OPA)。
In this paper, we propose a relay selection amplify-and-forward (RS-AF) protocol in general bidirectional relay networks with two sources and N relays. In the proposed scheme, the two sources first simultaneously transmit to all the relays, and then, a single relay with a minimum sum symbol error rate (SER) will be selected to broadcast the received signals back to both sources. To facilitate the selection process, we propose a simple suboptimal min-max criterion for relay selection, where a single relay that minimizes the maximum SER of two source nodes will be selected. Simulation results show that the proposed min-max selection has almost the same performance as the optimal selection with lower complexity. We also present a simple asymptotic SER expression and make a comparison with the conventional all-participate AF relaying scheme. The analytical results are verified through simulations. To improve the system performance, optimal power allocation (OPA) between the sources and the relay is determined based on the asymptotic SER.
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