基于认知无线电的双向中继网络的资源分配

doi:10.11959/j.issn.1000-0801.2015061

摘要/Abstract

摘要：

针对认知无线电中的双向中继网络，研究了基于非完美感知的频谱机会式接入和频谱共享接入下的资源分配问题。与传统基于认知的双向中继的资源分配方法不同，提出的算法联合考虑了感知时间和次级系统的发射功率。在感知时间和发射功率满足条件的情况下，使次级系统的吞吐量最大。为了有效地保护主用户不受干扰，在每一跳都考虑了平均干扰功率约束，同时考虑次级系统总的功率约束。在非完美感知的频谱机会式接入和频谱共享接入机制下，新算法能够获得最优的感知时间和功率分配。最后，仿真比较了两种方案的性能，验证了新算法的有效性。

关键词: 认知无线电, 双向中继, 感知时间, 功率分配

Abstract:

The resource allocation issue for sensing-based spectrum opportunistic access and sensing-based spectrum sharing access in two-way relay cognitive network with imperfect spectrum sensing was discussed.Different from the traditional resource allocation methods for two-way relay network,new algorithm jointly considering sensing time and transmission power in secondary system.Under the condition of the sensing time and the transmission power,the maximal throughput of the secondary system can be obtained.To protect the primary user effectively from interference,the average interference power constraint in each hop was considered.The total transmission power constraint of the secondary system is also considered.The proposed algorithms can acquire the optimal sensing time and power allocation under imperfect spectrum sensing for the sensing-based spectrum opportunistic access and sensing-based spectrum sharing access.Finally,the performance of the two schemes was compared and the effectiveness of the proposed algorithm was verified.

Key words: cognitive radio, two-way relay, sensing time, power allocation

梁爽,杨守义,郝万明. 基于认知无线电的双向中继网络的资源分配[J]. 电信科学, 2015, 31(3): 74-82.

Shuang Liang,Shouyi Yang,Wanming Hao. Resource Allocation for Two-Way Relay Network Based on Cognitive Radio[J]. Telecommunications Science, 2015, 31(3): 74-82.

图/表 7

图1

图2

图3

表1

次级系统T1—T2链路接入信道的4种可能情景"

主用户状态	感知结果	相关概率	传输功率	速率
不存在（ $H_{0}^{n}$ ）	$H_{0}^{n}$	1-p_f	$p_{1, n}^{0}, p_{2, n}^{0}, p_{r, n}^{0}$	r_00,n
不存在（ $H_{0}^{n}$	H₁n	p_f	$p_{1, n}^{1}, p_{2, n}^{1}, p_{r, n}^{1}$	r_01,n
存在（ $H_{1}^{n}$ ）	$H_{0}^{n}$	1-p_d	$p_{1, n}^{0}, p_{2, n}^{0}, p_{r, n}^{0}$	r_10,n
存在（ $H_{1}^{n}$ ）	$H_{1}^{n}$	p_d	$p_{1, n}^{1}, p_{2, n}^{1}, p_{r, n}^{1}$	r_11,n

表1

图4

图5

图6

参考文献 19

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