Capacity-Approaching Turbo Coding For Half-Duplex Relaying
Capacity-Approaching Turbo Coding For Half-Duplex Relaying
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DOI：
10.1109/tcomm.2007.906404
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发表时间：
2007-10
影响因子：
8.3
通讯作者：
Zheng Zhang;T. Duman
中科院分区：
文献类型：
--
作者：
Zheng Zhang;T. Duman
在这篇文章中，我们提出了半双工中继系统的容量逼近Turbo编码方案，这是我们以前关于全双工中继编码的工作的扩展。我们考虑在传输中使用特定的信号星座(例如，二进制相移键控)，开发将在源节点和中继节点使用的实用编码方案，并描述在目的节点的合适的信息组合技术。与全双工中继系统不同，目的节点不执行多个连续块的联合解码；相反，它一次处理一帧。此外，对于半双工中继方案，对于中继节点的监听时段长度的优化是一个问题。通过利用信息理论工具，我们执行了这种优化，并将其用于开发我们的接近容量的编码/解码方案。具体地，当时间片段被证明小于传输速率时，中继节点不能对传输的所有信息比特进行解码，并且必须使用部分解码方法。通过一组广泛的例子，我们观察到所提出的方案有望接近相应的信息理论极限(界)。特别是，对于所研究的所有情况，在各种信道条件下，我们已经在限制容量的1-1.5分贝(大多数情况下，几乎在1.2分贝以内)内获得了10-5或更低的误码率。还描述了所提出的方案对编码调制和多输入多输出系统的扩展。
In this paper, we develop capacity-approaching turbo-coding schemes for half-duplex relay systems as an extension of our previous work on coding for full-duplex relays. We consider the use of specific signal constellations (e.g., binary phase-shift keying) in transmission, develop practical coding schemes to be used at the source and the relay nodes, and describe a suitable information combining technique at the destination node. Unlike the full-duplex relay systems, the destination node does not perform joint decoding of multiple consecutive blocks; instead, it works with one frame at a time. Furthermore, for the half-duplex relaying scheme, the optimization of the length of the listening period for the relay node is an issue. By utilizing information theoretical tools, we perform this optimization and use it in the development of our capacity-approaching coding/decoding schemes. Specifically, when the fraction of time turns out to be less than the transmission rate, the relay node is unable to decode all the information bits transmitted, and a partial decoding approach has to be used. Through a comprehensive set of examples, we observe that the proposed scheme is promising to approach the corresponding information theoretical limits (bounds). In particular, for all the cases studied, we have obtained bit error rates of 10-5 or lower within 1--1.5 dB (in most cases, almost within 1.2 dB) of the constrained capacity under a variety of channel conditions. Extensions of the proposed scheme to coded modulation and to multiple-input multiple-output systems are also described.