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LLR-aware smart link-adaptive strategy for decode-and-forward cooperative communication

  • Published:
Journal of Electronics (China)

Abstract

Error propagation seriously degenerate the diversity order of Decode-and-Forward (DF) cooperative communication. To address this problem, a novel Log Likelihood Ratio (LLR)-based Link Adaptive Relaying (LAR) is proposed to promote adaption accuracy at relay. The instantaneous Bit Error Probability (BEP) is calculated according to the LLR of the received signals firstly, then based on it, the equivalent Signal-to-Noise Ratio (SNR) is employed to operate dynamic power scaling by relay. It is theoretically proved that the full diversity order can be attained by the scheme. Besides, the power sensitivity is also analyzed. Simulation results show that the proposed scheme outperform the conventional LAR and can achieve full diversity order. Moreover, its strong adaptation to SNR fluctuation is validated.

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Authors and Affiliations

  1. Wireless Communications Key Lab of Jiangsu Province, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Yulun Cheng & Longxiang Yang

  2. Key Lab of Broadband Wireless Communication and Sensor Network Technology, Ministry of Education, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Yulun Cheng & Longxiang Yang

  3. Nanjing University of Posts and Telecommunications, No. 66 Xinmofan Road, Nanjing, 210003, China

    Longxiang Yang

Authors
  1. Yulun Cheng
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  2. Longxiang Yang
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Correspondence to Longxiang Yang.

Additional information

Supported by the National Natural Science Foundations of China (No. 61071090, No. 61171093), the Postgraduate Innovation Programs of Scientific Research of Jiangsu Province (CXZZ11_0388, CXLX11_0404), Jiangsu Province Natural Science Foundation Key Projects (11-KJA510001), National Science and Technology Key Projects (2011ZX03005-004-003), and Jiangsu 973 Projects (BK2011027).

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Cheng, Y., Yang, L. LLR-aware smart link-adaptive strategy for decode-and-forward cooperative communication. J. Electron.(China) 30, 175–182 (2013). https://doi.org/10.1007/s11767-013-2162-y

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  • DOI: https://doi.org/10.1007/s11767-013-2162-y

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