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提出了一种多主从用户相互协作的认知共存网络系统模型.在该模型中,控制中心已知所有用户的位置并为每个主用户分配最近的从用户进行协作通信,控制中心通过从用户反馈的感知结果来获取频谱空洞信息并为从用户分配工作频段.主用户利用正交子信道接入基站.从用户利用网络中未用的频谱空洞采用放大前传机制为主用户转发数据.推导了在该模型下主用户的中断概率,并对主用户发送概率ps、主从用户间发射功率分配系数ξ和主从用户数对系统的影响进行了仿真.仿真结果表明,主从用户间平均分配发射功率在ξ=0.5且网络中主从用户数目相同时系统性能最优.
This paper proposes a cognitive coexistence network system model in which multiple masters and secondary users cooperate with each other, in which the control center knows the locations of all users and allocates the most recent collaborative communication from users to each primary user. The control center, User perception of the feedback to obtain the spectrum of information and to allocate the working frequency band for the user from the user using the orthogonal subchannel access to the base station from the user using the network to use the spectrum of unused spectrum hole amplification forward transmission mechanism for the main user data forwarding. In this model, the probability of disruption of the primary user is simulated and the impact on the system of the primary user transmission probability ps, the transmit power allocation coefficient ξ between primary and secondary users and the number of primary users and secondary users is simulated. The simulation results show that the average The system performance is optimal when ξ = 0.5 is assigned to transmit power and the number of primary and secondary users in the network is the same.