一种基于轮回的认知OFDM子载波分配方法

A Sub-Carrier Allocation Method Based on Ring for OFDM-CR System

认知无线电技术是能够提高有限频谱利用率,进而缓解当前有限频谱资源短缺压力的有效手段。在多用户认知OFDM系统中,高效并合理地决定子载波分配对系统性能至关重要。本文提出了一种基于轮回思想的子载波分配算法。该算法首先通过基于轮回的初次分配达到兼顾公平性的目的,再通过二次分配对初次分配结果加以迭代优化。仿真结果表明,在不增加算法复杂度的前提下,该算法可以避免选择深度衰落的子信道,相比同类算法,该算法可以获得更优的误比特性能。

The paper presents a ring-based sub-carrier allocation method, which can be divided into two steps, the initial allocation provides fairness among multi-users and the iterative optimization allocation is for improvement. The simulation results show the method not only can avoid selecting deep fading sub-channel, but also can achieve better bit error performance without any addition of computational complexity.