Cooperative Diversity using Soft Decision and Distributed Decoding
Cooperative Diversity using Soft Decision and Distributed Decoding
复制标题
使用软决策和分布式解码的协作多样性
DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
H. Morikawa
中科院分区：
文献类型：
--
作者：
Y. Hairej;A. Darmawan;H. Morikawa
协作通信技术通过形成天线阵列，利用无线信道的空间分集，实现多用户单天线环境下的多输入多输出（MIMO）性能。这些改进可以体现在更高的数据速率、更低的传输功率或增加网络中的覆盖范围方面。本文提出了一种利用软信息和分布式turbo译码的新型协同中继概念。继电器使用软输入软输出（SISO）解码器重新生成对数似然比（LLRs），然后将该后置信息以其软形式转发到目的地，产生每个源传输位的似然。在目的地，转发的比特作为先验信息辅助迭代turbo解码。结果表明，我们的方案能够以较小的开销获得传统合作分集所能达到的增益。
Cooperative communications techniques exploit the spatial diversity of wireless radio channel by forming antenna arrays in order to achieve Multiple Input Multiple Output (MIMO) performance in multi-user single-antenna environment. The improvements can be in terms of higher data rate, lower transmission power, or increase coverage in the network. In this paper we propose a new cooperative relaying concept using soft information and distributed turbo decoding. The relay regenerates a Log-Likelihood Ratios (LLRs) using a Soft Input Soft Output (SISO) decoder, then forwards this a posteriori information to the destination in its soft form yielding a likelihood for every source transmitted bit. At destination, the forwarded bits serve as a priori information to assist the iterative turbo decoding. Our results show that the gain achievable using the conventional cooperative diversity is obtained through our schemes with less amount of overhead.