一种用于无线网络协作广播的Plotkin-Alamandro叠加编码方案
A Plotkin-Alamouti Superposition Coding Scheme for Cooperative Broadcasting in Wireless Networks
摘要：
本文论述了叠加编码的情况下，两个协调的源节点，介绍了伯格曼和封面在1974年的开创性工作的合作广播。介绍了一种用于两类目的（或中继）节点的方案：近节点和远节点，根据它们到发送节点对的空间距离进行排名。利用Plotkin提出的（u，u+v）-构造法将两个线性码组合起来，构造出两级线性不等差错保护（LUEP）码.然而，代替在源编码器中子码码字的二进制加法，这里调制的子码序列在目的地（或中继）节点天线处被组合。伯格曼斯和盖把这称为空中混音。在瑞利衰落的情况下，额外的分集阶数，以及信道估计误差的鲁棒性时，源节点发送的编码序列对根据Alamanti的发送分集方案。我们将这种组合称为Plotkin-Alamandro方案，并研究了其在AWGN和瑞利衰落信道下的性能。
英文摘要：
This paper deals with superposition coding for cooperative broadcasting in the case of two coordinated source nodes, as introduced in the seminal work of Bergmans and Cover in 1974. A scheme is introduced for two classes of destination (or relay) nodes: Close nodes and far nodes, as ranked by their spatial distances to the pair of transmitting nodes. Two linear codes are combined using the (u,u+v)-construction devised by Plotkin to construct two-level linear unequal error protection (LUEP) codes. However, instead of binary addition of subcode codewords in the source encoder, here modulated subcode sequences are combined at the destination (or relay) nodes antennae. Bergmans and Cover referred to this as over-the-air mixing. In the case of Rayleigh fading, additional diversity order as well as robustness to channel estimation errors are obtained when source nodes transmit pairs of coded sequences in accordance to Alamouti's transmit diversity scheme. We refer to this combination as a Plotkin-Alamouti scheme and study its performance over AWGN and Rayleigh fading channels with a properly partitioned QPSK constellation.
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