naa a22 4500 51079405X CHVBK 20180411083330.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1007/s11277-012-0743-y doi (NATIONALLICENCE)springer-10.1007/s11277-012-0743-y Superposition Coding and Analysis for Cooperative Multiple Access Relay System [Elektronische Daten] [Yan Meng, Gang Liu, Gang Shen, Zheng Liu, Qi Jiang, Yanbo Tang] The conventional straightforward relaying scheme named decode-and-forward (DF) protocol is used at relay to decode the data received from source and forward the decoded data to the destination to improve the spatial diversity gain. Although it is a simple scheme, the total resource efficiency is low for multiple sources. Superposition coding has been known as a spectral efficient technique in wireless networks. However, when it is applied to the uplink multiple access relay systems, it suffers from performance degradation caused by the power allocation between the symbols of multiple sources. In this paper, we propose to remedy this problem by using hierarchical modulation at the source node and superposition coding at the relay node to enhance the bit energy. We investigate how hierarchical modulation can be incorporated and optimized with superposition coding. Specially, we discuss the capacity behavior of the proposed scheme and compare with the baseline, namely the capacity behavior of the existing DF scheme and the capacity behavior of the superposition coding. Our results are encouraging in that superposed hierarchical modulation significantly improves the better block error rate and capacity performance in multiple access relay channels. Springer Science+Business Media, LLC., 2012 Cooperative communication nationallicence Decode-and-forward (DF) nationallicence Superposition coding nationallicence Multiple access relay channel nationallicence Meng Yan Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Liu Gang Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Shen Gang Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Liu Zheng Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Jiang Qi Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Tang Yanbo Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut Wireless Personal Communications Springer US; http://www.springer-ny.com 70/2(2013-05-01), 1011-1028 0929-6212 70:2<1011 2013 70 11277 https://doi.org/10.1007/s11277-012-0743-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0743-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Meng Yan Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 700 1- Liu Gang Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 700 1- Shen Gang Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 700 1- Liu Zheng Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 700 1- Jiang Qi Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 700 1- Tang Yanbo Research and Innovation Center, Alcatel-Lucent Shanghai Bell, Co., Ltd., Shanghai, China aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 70/2(2013-05-01), 1011-1028 0929-6212 70:2<1011 2013 70 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer