Underlay cognitive relay networks with imperfect channel state information and multiple primary receivers

Underlay cognitive relay networks with imperfect channel state information and multiple primary receivers
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具有不完善信道状态信息和多个主接收器的底层认知中继网络

DOI:
10.1049/iet-com.2014.0429
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发表时间:
2015-03
期刊:
影响因子:
1.6
通讯作者:
Guan Lei
Guan Lei
中科院分区:
计算机科学4区
文献类型:
--
作者:
Huang Haiyan;Li Zan;Si Jiangbo;Guan Lei

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在这项研究中,作者研究了不完美的信道状态信息(CSI)的影响,在多个主用户(PU)的存在下,认知无线电网络。特别地,在多个主动部分解码转发(DF)中继可用的情况下,中继选择信道和干扰信道都被假设为不完美的。首先,基于干扰信道的瞬时信道状态信息(ICSI),推导出中断概率(OP)和干扰概率(IP)的精确闭合形式表达式,其中IP作为性能度量来量化次级用户(SU)对PU造成的有害干扰的影响.结果表明,当干扰信道的ICSI不理想时,次级网络总是干扰PU的通信。然后,为了减少由次级节点造成的有害干扰,我们提出了一种依赖于干扰信道的部分CSI(PCSI)的自适应功率控制方案。最后,仿真结果验证了分析研究的正确性和有效性,并表明该方案在次节点对PU的干扰和SU的性能之间取得了较好的折衷。
In this study, the authors investigate the effect of imperfect channel state information (CSI) on underlay cognitive radio networks in the presence of multiple primary users (PUs). Particularly, with multiple proactive partial decode-and-forward (DF) relays available, both the relay selection channels and interference channels are assumed to be imperfect. In this context, firstly, based on the instantaneous CSI (ICSI) of interference channels, exact closed form expressions for the outage probability (OP) and the interference probability (IP) are derived, where IP is used as a performance metric to quantify the impact of harmful interference caused by secondary user (SU) on PUs. It is shown that, when the ICSI of interference channels are imperfect, the secondary networks always interfere with PUs' communications. Then, to reduce the harmful interference caused by secondary nodes, we propose an adaptive power control scheme relying on the partial CSI (PCSI) of interference channels. Finally, simulation results verify the accuracy and effectiveness of the author's analytical study, and indicate the proposed scheme strikes a good tradeoff between the interference introduced by secondary nodes on PUs and SU's performance.
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