多用户OFDM系统中子载波比特分配算法

针对多用户OFDM系统中的功率优化问题,提出了一种新的子载波、比特分配算法。利用匈牙利算法对子载波进行初始分配,然后根据信道的状态信息为每个子载波动态地分配比特,最后对分配的结果作进一步调整,直到发射总功率不再减小为止。仿真结果表明,调整后的结果比原有方法有所改善,在满足传输速率和误码率要求的条件下,有效地降低了系统发射总功率。

Subcarrier and Bit Allocation Algorithm for Multi-user OFDM Svstem

Aiming at the power optimization problems of multi-user OFDM system,a new algorithm of subcarrier and bit allocation is proposed. Hungarian algorithm is used to distribute subcarriers initially. Then,according to the channel state information,bits for each subcarrier is allocated. Finally, further adjustments between the allocations are made dynamically until the total transmitting power cannot be reduced. The simulation results show that the performance is improved after the adjustments. Under the condition of satisfying transmission rate and BER,the proposed method reduces the total system transmitting power effectively.