论文部分内容阅读
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。
Aiming at the shortcomings of high computational complexity of ACG algorithm based on OFDM subcarrier allocation in cognitive radio, an OFDM subcarrier allocation algorithm is proposed to reduce the computational complexity. The new allocation algorithm transforms the original allocation for each subcarrier to the allocation for subchannels by combining successive subcarriers with little change in channel state into subchannels by using the method of setting a variance threshold Reduce the allocation of spectrum resources. Simulation analysis shows that the new allocation algorithm at the expense of a small amount of spectrum efficiency, compared with the original algorithm, significantly reducing the computational complexity.