摘要
针对认知无线电中基于OFDM子载波分配ACG算法的计算复杂度高的这一缺点,提出了一种能降低计算复杂度的OFDM子载波分配算法。新的分配算法是通过运用设定方差门限值的方法把一些信道状态变化不大的连续子载波结合成子信道,从而将原来针对每个子载波的分配转变为针对子信道的分配,以此来降低频谱资源的分配次数。仿真分析表明,新的分配算法以牺牲少量频谱效益的代价,较之原有算法,明显地降低了计算复杂度。
A low-complexity subcarrier allocation algorithm for OFDM is presented.This algorithm,with established covariance threshold,integrates the successive subcarriers without much change into the subchannel,and thus turns the allocation of each subcarrier into the allowcation of subchannel and reduces the allocation number of frequency resources.Simulation indicates that at the cost of less spectrum efficiency,the new allocation algorithm could,as compared with the original algorithm,remarkably reduce the calculation complexity.
出处
《通信技术》
2012年第2期56-58,共3页
Communications Technology
