一种低复杂度的OFDM自适应比特功率分配方法  

A low complexity OFDM adaptive bit power allocation method

作　　者：周凯福 程伟[1] 窦立超 张西平 ZHOU Kaifu;CHENGWei;DOU Lichao;ZHANG Xiping(Air Force EarlyWarning Academy,Wuhan 430019, China)

机构地区：[1]空军预警学院

出　　处：《空军预警学院学报》2019年第3期212-215,共4页Journal of Air Force Early Warning Academy

摘　　要：OFDM自适应调制技术根据信道状态信息,自适应地进行子载波的比特和功率分配,从而有效提高通信系统的传输性能.针对Fischer算法在自适应进行子载波的比特和功率分配过程中存在迭代运算量大的问题,提出了一种基于改进Fischer算法的低复杂度资源分配方法.该方法通过计算子信道可传输信息的最高噪声方差门限,一次性排除所有不可用的子载波,而在比特分配调整过程中采用次优思想进行调整优化.仿真结果表明,与Fischer算法相比,改进Fischer算法复杂度大大降低,并且其误比特性能与Fischer算法基本相当.OFDM adaptive modulation technology adaptively allocates bits and power of subcarriers according to channel state information, thus effectively improving transmission performance of communication system. Aiming at the problem that the Fischer algorithm has a large amount of iterative computation in the process of adaptive subcarrier bit and power allocation, this paper proposes a low complexity resource allocation method based on improved Fischer algorithm. By calculating the maximum noise variance threshold of the sub-channel’s transmittable information, the proposed algorithm excludes all the unavailable sub-carriers at one time, and adopts the sub-optimal idea for adjustment and optimization in the bit allocation adjustment process. The simulation results show that compared with Fischer algorithm, the complexity of improved Fischer algorithm is greatly reduced, and its bit error performance is basically the same as that of Fischer algorithm.

关 键 词：正交频分复用 自适应调制 比特功率分配 Fischer算法 

分 类 号：TN914[电子电信—通信与信息系统]