Diversity and delay performance of max link selection relay cooperation systems over non-identical Nakagami-m fading channels

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• 作者：Xiangdong Jia ; Meng Zhou ; Xiaochao Dang…
• 关键词：Cooperative relay ; Buffers ; Non ; identical fading ; Nakagami ; m ; Outage performance ; Packet delay
• 刊名：EURASIP Journal on Wireless Communications and Networking
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：2016
• 期：1
• 全文大小：2,687 KB
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• 作者单位：Xiangdong Jia (1) (2) (3)
  Meng Zhou (1)
  Xiaochao Dang (1)
  Longxiang Yang (2) (3)
  Hongbo Zhu (2) (3)
  
  1. College of Computer Science and Engineering, Northwest Normal University, Lanzhou, 730070, China
  2. Wireless Communication Key Lab of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China
  3. Key Lab of Broadband Wireless Communication and Sensor Network Technique of Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China
  
• 刊物主题：Signal, Image and Speech Processing;
• 出版者：Springer International Publishing
• ISSN：1687-1499

文摘

The work focuses on the max link selection (MLS) schemes of buffer-aided relaying over the independent and non-identically distributed (i.ni.d) Nakagami-m fading channels in terms of outage probability, average packet delay, and improved diversity-delay trade-off schemes. By modeling the transition of buffer states as a Markov chain, we first obtain the outage probability and average packet delays for MLS schemes, which are given with closed-form expressions. The achieved results show that the i.ni.d fading channels impose severe loss in the diversity and coding gains of MLS schemes. Especially, when the disparity among the channel powers is very large, the diversity order provided by the MLS schemes is less than the ones provided by the traditional best relay selection (T-BRS) and max-max link selection (MMLS) schemes even if the buffers’ size is large enough. For the average packet delay of MLS schemes, our results show that they are impacted by the transmit power and the fading severity factors. In general, in the low transmit power, the average packet delays are varying with the transmit power. However, in the high transmit power, the average packet delays approach the stationary values. Besides of this, it is also achieved that the i.ni.d fading makes the average packet delays of MLS schemes at all relays are different. When the powers of relay-destination links are greater than the ones of source-relay links, the average packet delays can be reduced evidently. Motivated by the observations, a weight-based MLS (W-MLS) diversity-delay trade-off scheme is proposed. The proposed W-MLS diversity-delay trade-off schemes not only have the low packet delays at all relays but also provide enough diversity and coding gains over T-BRS and MMML, which can overcome the performance loss caused by non-identical distribution on MLS schemes. Keywords Cooperative relay Buffers Non-identical fading Nakagami-m Outage performance Packet delay