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QoS-Driven Jointly Optimal Subcarrier Pairing and Power Allocation for Decode-and-Forward OFDM Relay Systems

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Abstract

In this paper, we investigate the quality-of-service (QoS) driven subcarrier pairing and power allocation for two-hop decode-and-forward (DF) OFDM relay systems. By integrating the concept of effective capacity, our goal is to maximize the system throughput subject to a given delay-QoS constraint. Based on whether the destination can receive the signal transmitted by the source, we consider two scenarios, i.e. OFDM DF relay systems without diversity and OFDM DF relay systems with diversity, respectively. For OFDM DF relay systems without diversity, we demonstrate that the jointly optimal subcarrier pairing and power allocation can be implemented with two separate steps. For OFDM DF relay systems with diversity, we propose an iterative algorithm to achieve jointly optimal subcarrier pairing and power allocation. Furthermore, we find that the analytical results show different conclusions for the two types of OFDM relay systems. For OFDM relay systems without diversity, the optimal power allocation depend on not only the channel quality of subcarriers but also the delay QoS constraints, while the optimal subcarrier pairing just depends on the channel quality of subcarriers. For OFDM relay systems with diversity, both the optimal subcarrier pairing and power allocation depend on the channel quality of subcarriers and the delay QoS constraints. Simulation results show that our proposed scheme offers a superior performance over the existing schemes.

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Authors and Affiliations

  1. School of Mechanical and Electronic Engineering, Guangzhou University, Guangzhou, 510006, Guangdong, China

    Gaofei Huang & Dong Tang

  2. School of Information Science and Technology, Sun Yat-Sen University, Guangzhou, 510006, Guangdong, China

    Gaofei Huang, Ping Yang & Jiayin Qin

  3. School of Information Science and Engineering, Guangxi University for Nationalities, Nanning, 530006, Guangxi, China

    Liping Luo

  4. School of Information Science, Guangdong University, Guangzhou, 510006, Guangdong, China

    Guangchi Zhang

Authors
  1. Gaofei Huang
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  2. Liping Luo
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  3. Guangchi Zhang
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  4. Ping Yang
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  5. Dong Tang
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  6. Jiayin Qin
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Correspondence to Gaofei Huang.

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Huang, G., Luo, L., Zhang, G. et al. QoS-Driven Jointly Optimal Subcarrier Pairing and Power Allocation for Decode-and-Forward OFDM Relay Systems. Wireless Pers Commun 71, 1597–1618 (2013). https://doi.org/10.1007/s11277-012-0894-x

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  • DOI: https://doi.org/10.1007/s11277-012-0894-x

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