基于子载波加权的峰均比与带外辐射联合降低方法

针对OFDM系统中PAPR与OBP的降低互相矛盾的问题,提出了一种新的基于子载波加权的联合优化方法。该方法将符号数据与最优加权向量相乘达到同时降低系统PAPR与OBP的目的;为降低计算复杂度,利用改进的遗传算法求解最优加权向量。新方法频谱效率高,且无需发送额外信息,并可根据当前通信环境,通过改变折衷系数实现对PAPR与OBP降低程度的灵活控制。仿真结果表明,与采用两步优化降低PAPR与OBP的方法相比,该方法能更有效地降低OFDM系统的PAPR与OBP,且计算复杂度低,实现十分简单,具有很强的实用性。

Joint reduction of peak-to-average power ratio and out-of-band power based on subcarrier weighting in OFDM systems

Considering the conflict of PAPR and OBP reductions in OFDM systems,a new method based on subcarrier weighting was proposed for the joint reduction.The symbols on subcarriers were multiplied by optimal weighting vector to reduce PAPR and OBP jointly,and an improved GA was used to calculate the optimal weighting vector for lower complexity.It was more effective in spectrum utility and did not need any transmission of side information.Furthermore,with trade-off parameter,it offered more flexibility to control the reduction by changing the relative weighting of the two optimization criteria.The simulation results indicate that,compared with a system that performs two separate optimization steps,the proposed method can significantly enhance the amount of PAPR and OBP reduction with lower computation complexity.It is simple to implement,which makes it very practical.