Joint subcarrier and power allocation for reciprocally-benefited spectrum sharing in cognitive radio networks

Dawei Wang, Pinyi Ren, Yichen Wang
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Abstract

Aiming at reducing the outage probability of primary users (PU) and obtaining spectrum resources for secondary users (SU), in this paper, we proposed a joint subcarrier and power allocation scheme (JSPA) for reciprocally-benefited spectrum sharing with SUs cooperating with PUs. In JSPA scheme, SUs adopt the decode-and-forward (DF) relaying protocol to help PUs in a two-stage way. Meanwhile, a fraction of unallocated licensed spectrum is allocated for the secondary transmission in every stage. However, if the two-stage cooperation still cannot satisfy PUs' outage quality-of-service (QoS) requirement, SUs then switch to the access mode to entirely capture the licensed spectrum. Our proposal is to maximize the average transmission rate of SUs through joint allocation of subcarriers and power. The closed-form expressions about the outage probability and average transmission rate of both PUs and SUs are derived. Simulation results show that compared with the conventional cognitive cooperation schemes, the average transmission rate of SUs improves.
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认知无线电网络中互惠频谱共享的联合子载波和功率分配
为了降低主用户(PU)的中断概率,为次用户(SU)获取频谱资源,本文提出了一种联合子载波和功率分配方案(JSPA),实现主用户与副用户的频谱互惠共享。在JSPA方案中,su采用DF (decode and forward)中继协议,分两阶段帮助pu。同时,在每个阶段分配一部分未分配的许可频谱用于二次传输。但是,如果两阶段合作仍然不能满足pu的中断服务质量(QoS)要求,则su切换到接入模式以完全捕获许可频谱。我们的建议是通过联合分配子载波和功率来最大化单元的平均传输速率。导出了pu和su的停电概率和平均传输速率的封闭表达式。仿真结果表明,与传统的认知协作方案相比,SUs的平均传输速率有所提高。
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