中文摘要：

针对认知无线电系统的帧结构中数据发送时间设置不当可能严重干扰主用户的问题，基于主用户对信道的占用/空闲时间服从负指数分布的假设，推导出主用户在数据发送时间内可出现任意次数时，干扰时间关于数据发送时间的函数模型，并据此提出一个干扰率受限的数据发送时间设置方案。根据该方案设定的数据发送时间，能较精确地控制主用户所受的干扰率。仿真实验结果表明：干扰率的实验值与本文干扰模型的理论值非常接近，而与已有算法的干扰率理论值相差较大，验证了该干扰模型的正确性。

英文摘要：

Aiming at the serious interferences to primary users for time-slotted cognitive radio system if data transmission time was set unreasonably, based on the assumption that the primary user channel occupancy/idle time obeys the exponentially distributed, an interference model about data transmission time, in which the frequency of occurrence of primary user was unlimited, was derived. On this basis, an interference rate constrained data transmission time setting algorithm was proposed. Using this transmission time, the interference to the primary user could be accurately controlled. The simulation results show that the experimental interference rate is very close to the theoretical values of the interference model, but the gap between experimental values and theoretical values is obvious in the existing methods, which fully verifies the correctness of the interference model.