摘要
为解决正交频分多址接入(OFDMA)系统目前存在的子载波、比特和功率等资源的分配算法复杂度高的问题,提出了一种低复杂度的解决方案。其中,比特分配采用香农算法,并给出了优化策略;子载波分配算法利用多用户频率分集来提高信道容量;功率分配算法基于实时性更好的路径损耗补偿法,使得算法的整体复杂度降低,最终实现了系统资源的合理分配。仿真结果表明,采用该算法可以进一步降低系统误码率,提高实时性,同时算法复杂度也有较大降低。
To solving the problem of present high-complexity resource-allocation algorithm of bit, subcarrier and power in orthogonal frequency division multiple access（OFDMA） system, a low-complexity solution was proposed. Bit allocation used Shannon algorithm, and it was optimized. Subcarrier allocation used multi-user frequency diversity to improve channel capacity. Power allocation algorithm used better real-time path-loss compensation method, and it reduced the overall complexity. At last, the rational allocation of system＇s resource was realized by the new algorithm. Simulation results show that new resource-allocation algorithm can further reduce the system＇s bit-error rate, improve real-time performance. At the same time, algorithm＇s complexity is greatly reduced.
出处
《机电工程》
CAS
2009年第10期6-9,共4页
Journal of Mechanical & Electrical Engineering
基金
国家自然科学基金资助项目(60671037)
国际科技合作与交流专项资助项目(2008KR1041)
宁波市工业攻关国际合作资助项目(2007B10051)
关键词
正交频分多址接入
比特分配
子载波分配
功率分配
orthogonal frequency division multiple access（OFDMA）
bit allocation
subcarrier allocation
power allocation
