多用户OFDM系统中的自适应子信道和比特、功率分配  

Adaptive sub-channel,bit and power allocation for multiuser OFDM systems

作　　者：赵丽丹[1] 周利岗[1] 

机构地区：[1]南京邮电学院通信工程系,江苏南京210003

出　　处：《电力系统通信》2003年第12期33-36,共4页Telecommunications for Electric Power System

摘　　要：提出了一种多用户OFDM系统中的自适应子信道和比特、功率分配算法。算法根据多径频率选择性衰落信道的瞬时特性,动态地为多用户分配子信道和传输比特数,并服从MA优化准则。这里采用分两步走(Two Step)的思想,将子信道的分配和子信道上的比特、功率分配分离开来,以减小联合分配带来的过高的计算复杂度。仿真结果表明,与静态信道分配方案的自适应比特分配算法相比,该算法可以节约5～6dB的发送功率;与静态信道分配方案的等比特分配算法相比,该算法可以节约的发送功率大于10dB。An adaptive sub-channel,bit and power allocation algorithm for multiuser OFDM systems is proposed.According to instantaneous characteristics of the multi-path frequency selective fading channels,the adaptive algorithm assigns the sub-channels and bits for multiuser submit based on MA optimization.We separately perform sub-channel allocation and bit loading to decrease the computation caused by combinational allocation algorithm.The simulation results show that this algorithm can save 5～6dB transmission power compared with the adaptive bit allocation algorithm of static sub-channel allocation method,and save more than 10dB compared with the equal bit allocation algorithm of static sub-channel allocation methods.

关 键 词：移动通信系统 无线信道 多用户OFDM系统 自适应子信道 比特分配算法 功率分配算法 

分 类 号：TN929.5[电子电信—通信与信息系统]