摘要
针对OFDM系统提出一种基于裕度自适应(Margin Adaptive)的快速比特与功率分配算法,改进了Greedy(贪婪)算法。新算法利用不同子载波之间信道信噪比的对数关系,将子载波进行分组;在分配比特时,降低了原Greedy算法的循环迭代次数。仿真结果表明,在满足相同的通信服务质量(QoS)前提下,提出的分配算法,显著降低了算法的复杂度,发射功率增量很小,具有实用意义。
The paper presents a rapid bit and power allocation algorithm for OFDM System based on margin adaptation, which improves Greedy algorithm and groups sub--carriers by using logarithmic relationship among their channel SNR＇s. The circulation iteration times of original Greedy algorithm are reduced. The simulation results show that the new algorithm has less transmission power increment and great complexity reduction with the same QoS. It has bright prospect in applications.
出处
《现代电子技术》
2006年第22期79-81,共3页
Modern Electronics Technique
