Resource Allocation for Two-Way Amplify and Forward OFDM Relay Networks  

作　　者：Zhijun Liu Xiaofeng Tao Waheed ur Rehman 

机构地区：[1]Wireless Technology Innovation Institute,Key Laboratory of Universal Wireless Communications,Beijing University of Posts and Telecommunications,Beijing,China

出　　处：《China Communications》2017年第8期76-82,共7页中国通信（英文版）

基　　金：supported by the Science Instrument Special Funds of the National Natural Science Foundation of China under Grant No.61027003;the National High Technology Research and Development Program of China under Grant No.2012AA01A50604

摘　　要：Physical-layer network coding(PNC) promises substantial theoretical gain to achieve the maximum system throughput in cooperative relay transmission. However, with the increasing global warming, how to reduce power consumption while satisfy system throughput requirement is becoming a vital issue. In this paper, we investigate energy-efficiency resource allocation(RA) based on PNC with amplify-and-forward(AF) protocol in orthogonal frequency division multiple(OFDM) bidirectional transmission. To minimize the overall transmit power consumption with required system throughput requirement, we consider joint subcarriers and power allocation and formulate the objective task into a constrained optimization problem where the best relay node is selected to minimize total transmit power. The closed form optimization power allocation solutions are acquired by analytical derivation. Based on derivation, we propose a novel optimal energy-efficient power allocation(OE-PA). Numerical results are given to evaluate the performance of the derived scheme as compared to other schemes and show that our scheme has signifi cant improvement to energy saving.Physical-layer network coding（PNC） promises substantial theoretical gain to achieve the maximum system throughput in cooperative relay transmission. However, with the increasing global warming, how to reduce power consumption while satisfy system throughput requirement is becoming a vital issue. In this paper, we investigate energy-efficiency resource allocation（RA） based on PNC with amplify-and-forward（AF） protocol in orthogonal frequency division multiple（OFDM） bidirectional transmission. To minimize the overall transmit power consumption with required system throughput requirement, we consider joint subcarriers and power allocation and formulate the objective task into a constrained optimization problem where the best relay node is selected to minimize total transmit power. The closed form optimization power allocation solutions are acquired by analytical derivation. Based on derivation, we propose a novel optimal energy-efficient power allocation（OE-PA）. Numerical results are given to evaluate the performance of the derived scheme as compared to other schemes and show that our scheme has signifi cant improvement to energy saving.

关 键 词：Energy-effi ciency Resource allocation physical-layer network coding OFDM system 

分 类 号：TN929.53[电子电信—通信与信息系统]