摘要
针对多用户多输入多输出-正交频分复用(multiple input multiple output-orthogonal frequency divi-sion multiplexing,MIMO-OFDM)系统的自适应资源分配问题,对子载波比特功率两步分配(Two-Steps)和联合分配方法进行了比较,分析了收发天线数目对系统性能的影响。提出了一种改进的子载波比特功率算法,该算法基于两个用户可以同时在一个子载波上发送数据的子载波复用方法,将子载波和比特功率联合分配,对比特重新调整的迭代过程进行了改进。仿真结果表明,该算法在不影响系统误码性能的前提下降低了复杂度。
To investigate the adaptive resource allocation scheme for multi-user MIMO-OFDM （multiple input multiple output-orthogonal frequency division multiplexing） systems, the Two Steps adaptive allocation algorithm and the joint allocation algorithm are compared, and the performance of the adaptive allocation algorithm for the MIMO-OFDM system is analyzed by changing the number of the transceiver antennas. An improved subcarrier and bit-power allocation algorithm based on the subcarrier multiplexing algorithm that two users can send data at the same subcarrier synchronously is proposed, and the iterative process of the bit readjustment for the joint subcarrier and bit-power allocation is improved. The simulation results show that the proposed algorithm can reduce the complexity of the joint subcarrier and bit-power allocation without decreasing the BER performance of the system.
出处
《系统工程与电子技术》
EI
CSCD
北大核心
2009年第10期2306-2310,共5页
Systems Engineering and Electronics
基金
国家自然科学基金(60772062
60872018)
国家重点基础研究发展计划(973计划)(2007CB310607)
东南大学移动通信国家重点实验室开放研究基金(N200813)资助课题
关键词
多输入多输出
正交频分复用
子载波
比特功率分配
multiple input multiple output
orthogonal frequency division multiplexing
subcarrier
bitpower allocation
