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为了使认知无线电(CR)系统最大限度地利用频谱机会,提出了一种选择感知周期的方法.对于采用正交频分复用(OFDM)的CR系统,联合设计感知器和收发信机,交替进行频谱感知和数据传输,1次感知若干个授权用户子频带.在一定的感知性能要求下,给出了确定基于OFDM的CR系统感知时间长度的方法,并将最优感知周期的选择建模为一个带约束的非线性优化问题.优化结果显示,CR系统在最大限度地利用频谱机会的同时,能满足对授权用户干扰的限制.
In order to make the cognitive radio (CR) system make maximum use of the spectrum opportunity, a method of selecting the perception period is proposed.For the CR system using Orthogonal Frequency Division Multiplexing (OFDM), the joint design of the perceptron and the transceiver, Frequency spectrum sensing and data transmission are alternately performed, and a number of sub-bands of the authorized users are sensed at a time.A certain method of determining the perceived time length of an OFDM-based CR system is given under certain sensing performance requirements, and the selection of the optimal sensing period The model is a constrained nonlinear optimization problem. The optimization results show that the CR system can satisfy the interference of authorized users while maximizing the use of spectrum opportunities.