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Cooperative communications with hierarchical modulation in downlink OFDMA based cellular networks

ISSN号：1005-8885
期刊名称：《中国邮电高校学报：英文版》
时间：0
分类：TN925[电子电信—通信与信息系统;电子电信—信息与通信工程]
作者机构：[1]Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, China
相关基金：Sponsored by the National Natural Science Foundation of China（ Grant No. 60832009）, Beijing National Sciences Foundation（ Grant No. 4102044）, the Fundamental Research Funds for the Central Universities（ Grant No. BUPT2009RC0119）, and the National Hi-Tech Research and Development Program of China （ 863 Program）（ Grant No. 2009 AA01 Z246 ）.

中文摘要：

Cooperative transmission is a promising way to improve system performance in orthogonal frequency division multiple access (OFDMA) based cellular networks.This paper proposes two heuristic cooperation schemes including relay selection and resource allocation using hierarchical modulation (HM) to fully exploit the radio resources in cellular networks where user equipments (UEs) relay for each other.The relay selection procedure considers both the channel conditions and the energies left in relays to make the cooperative communications behave better.To mitigate the spectrum efficiency loss due to the half-duplex mode,the bits of relayaided UE and its relay (which is also a UE) are transmitted simultaneously in one sub-channel using HM to improve the utilization efficiency of sub-channels.Besides,time resources are used effectively with the adaptively changed proportion of the two sub-frames divided for relay transmission.Simulation results show that the proposed schemes can improve the spectrum efficiency compared with the traditional schemes.

英文摘要：

Cooperative transmission is a promising way to improve system performance in orthogonal frequency division multiple access （0FDMA） based cellular networks. This paper proposes two heuristic cooperation schemes including relay selection and resource allocation using hierarchical modulation （ HM ） to fully exploit the radio resources in cellular networks where user equipments （UEs） relay for each other. The relay selection procedure considers both the channel conditions and the energies left in relays to make the cooperative communications behave better. To mitigate the spectrum efficiency loss diae to tile fialt-dhplex mode, tile 151is ot refayaided UE and its relay （which is also a UE） are transmitted simultaneously in one sub-channel using HM to improve the utilization efficiency of sub-channels. Besides, time resources are used effectively with the adaptively changed proportion of the two sub-frames divided for relay transmission. Simulation results show that the proposed schemes can improve the spectrum efficiency compared with the traditional schemes.