【摘要】 OFDM是认知无线电系统传输链路合适的调制技术,为了在信道状态信息未知的情况下,高效地分配多用户OFDM资源,提出了一种混合遗传算法。该算法能在误码率和总发射功率一定的情况下最大化传输速率,自适应分配各子信道及其功率。仿真表明,该方法可有效增强搜索的精确度,增加系统容量,提高频带利用率。更多还原

【Abstract】 OFDM is a proper modulation technic for transmission link of cognitive radio.To allocate resource of multiuser OFDM(MU-OFDM) efficiently when the channel state information(CSI) is unavailable,a hybrid GA is proposed.The algorithm can maximate rate,allocate subchannels and power adaptively under certain BER and total transmit power.Simulation results show that the proposed method can achieve higher search precision,increase capacity and band utilization.更多还原