基于空间位置的混合频谱共享系统功率分配研究

doi:10.3969/j.issn.1000-436x.2014.02.014

Abstract

Abstract:

Based on the random spatial location of the secondary user, a spatial hybrid spectrum sharing model which combines overlay with underlay was proposed to improve spectrum utilization. Considering the different location of sec-ondary user, the interference received by primary receiver was analyzed and the work regions of the overlay and underlay were deduced under the primary user average interference constraint. The power allocation model was built under the criterion of maximizing the system average (ergodic) capacity. Furthermore, the optimal power allocation scheme was deduced as well as the maximum achievable capacity of the spatial hybrid spectrum sharing system. Analysis and simula-tion results indicate the hybrid spectrum sharing system has higher capacity than single overlay system.

Key words: wireless communication, spectrum sharing, cognitive radio, power allocation

Yan CAI,Jing ZHANG,Hong-bo ZHU. Power allocation of hybrid spectrum sharing based on the spatial location[J]. Journal on Communications, 2014, 35(2): 104-110.

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References 15

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参数描述	数值
高斯白噪声功率N₀B	-80dBmW
路径损耗因子α	4
瑞利衰落系数g₀ ,g₁	λ=1的指数分布
次用户最大发射功率P_max	30dBmW
次用户最小发射功率P_min	5dBmW
次用户平均发射功率限值P_av	25dBmW(320mW)
共享系统区域半径R	800m
次用户发射机与其目标接收机距离d	10m

Power allocation of hybrid spectrum sharing based on the spatial location

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