Cognitive relay-sharing by using hierarchical modulation under interference constraints

H. Khakzad, Reza Shakeri, Abbas Taherpour, T. Khattab, M. Hasna
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引用次数: 6

Abstract

In this paper, we investigate relay-sharing in cognitive radio (CR) networks to improve the secondary user's (SU's) performance in the presence of interference. It is assumed that the relay is shared simultaneously between both the primary user (PU) and the SU by using hierarchical modulation at the relay node while mapping the PU's and the SU's symbols onto two different layers of the hierarchical constellation. The proposed scheme relies on power adjusting, where the SU power adjustment is based on channel side information (CSI) and tolerable interference limit at the PU. Theoretical analyses along with simulation results are provided to evaluate the performance of the proposed dynamic spectrum sharing scheme. The results demonstrate that the proposed relay-sharing scheme may result in about 7dB and 15dB signal to noise ratio (SNR) improvement for the SU in low-SNR and high-SNR regimes, respectively.
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干扰约束下分层调制的认知中继共享
本文研究了认知无线电(CR)网络中的中继共享,以提高辅助用户(SU)在存在干扰时的性能。通过在中继节点上使用分层调制,将主用户(PU)和主用户(SU)的符号映射到分层星座的两个不同层,假设中继在主用户(PU)和主用户(SU)之间同时共享。该方案依赖于功率调整,其中SU功率调整基于信道侧信息(CSI)和PU的可容忍干扰限制。理论分析和仿真结果验证了所提出的动态频谱共享方案的性能。结果表明,在低信噪比和高信噪比情况下,中继共享方案可使SU的信噪比分别提高约7dB和15dB。
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