Adaptive Modulation Based Relay Selection and Power Allocation in Cooperative OFDM Wireless Networks

  • Nianlong Jia
  • Wenjiang Feng
  • Najashi Bara’u Gafai
  • Weiheng Jiang
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 246)

Abstract

Several problems that hinder the optimal performance of multiple relays cooperative OFDM wireless networks have been identified recently. Power allocation and relay selection are some of the problems encountered in these systems. In this paper, a bit reloading (BR) OFDM relaying scheme which solves the problem of both power allocation and relay selection in multiple relays cooperative OFDM wireless networks by selecting the best relay to retransmit the OFDM signal is presented. This method varies from other methods in open literature because bit loading is executed at each hop i.e. from source to relay, and from relay to the destination. Because the bottleneck of bit loading with regard to source-to-relay-to-destination subchannel is eliminated, our proposed scheme achieves more power gain and end-to-end data rate. The theoretic analysis and simulation result also demonstrates our scheme has a better performance.

Keywords

Cooperative communications OFDM Relay selection Bit loading 

References

  1. 1.
    Wanlu Sun, Lihua Li, Wei Yang (2011) Joint subcarrier pairing, relay selection and power allocation in OFDM relay systems. In: IEEE ICC, Kyoto, 2011, pp 1–5Google Scholar
  2. 2.
    Ding Y, Uysal M (2009) Amplify-and-forward cooperative OFDM with multiple-relays: performance analysis and relay selection methods. IEEE T Wireles Commun 8(10):4693–4698Google Scholar
  3. 3.
    Rui Yin, Yu Zhang, Jietao Zhang (2009) Distributed joint optimization of relay selection and subchannel pairing in OFDM based relay networks. In: IEEE PIMRC, Tokyo, 2009, pp 722–726Google Scholar
  4. 4.
    Jae Cheol Park, TanTaiDo, YunHeeKim (2010) Outage probability of OFDM-based relay networks with relay selection. In: IEEE 71st VTC conference, Taibei, 2010, pp 1–5Google Scholar
  5. 5.
    Bo Gui, LinDai, Leonard J (2008) Selective relaying in cooperative OFDM systems: two-hop random network. In: Proceeding of IEEE WCNC, Las Vegas, NV, 2008, pp 996–1001Google Scholar
  6. 6.
    Wendong Yang, Yueming Cai (2010) Distributed relay selection in OFDM-based cooperative wireless networks. In: 6th international conference on WiCOM, Chengdu, 2010, pp 1–4Google Scholar
  7. 7.
    Amin O, Uysal M (2012) Adaptive power loading for multi-relay OFDM regenerative networks with relay selection. IEEE T Commun 60(3):614–6199CrossRefGoogle Scholar
  8. 8.
    Lijie Wang, Haitao Zhao, Yong Xi (2010) Optimal power allocation and relay selection in OFDM-based cooperative systems. In: 6th international conference on WiCOM, Chengdu, 2010, pp 1–5Google Scholar
  9. 9.
    Lijie Wang, Haitao Zhao, Yong Xi (2010) Optimizing the performance of OFDM-based cooperative networks by relay selection, power allocation and relay localization. In: IEEE international conference on ultra-wideband, Nanjing, 2010, pp 1–4Google Scholar
  10. 10.
    Munoz D, Xie B (2012) An adaptive MIMO-OFDMA relay system. IEEE Commun Lett 1(5):496–499CrossRefGoogle Scholar
  11. 11.
    Ibrahim Khalil Sileh, Wei Xiang (2012) Distributed space-frequency coding for OFDM-based hybrid relay selection. In: ISCIT, international symposium, Gold coast, 2012, pp 594–598Google Scholar

Copyright information

© Springer International Publishing Switzerland 2014

Authors and Affiliations

  • Nianlong Jia
    • 1
  • Wenjiang Feng
    • 1
  • Najashi Bara’u Gafai
    • 1
  • Weiheng Jiang
    • 1
  1. 1.College of Communication EngineeringChongqing UniversityChongqingChina

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