基于天线波束成形的OFDMA系统的自适应资源分配

对正交频分复用接入系统在多用户多天线传输情况下的自适应资源分配策略进行了研究,提出了一种基于天线波束成形的,包括动态子载波分配、自适应调制、比特加载的无线资源分配方案.算法的优化设计目标是在满足总的恒定传输比特数和误比特率性能要求的情况下,使得系统总的发射功率最小.仿真结果表明,由于多天线阵列增益和多用户分集增益,系统整体性能得到了明显的优化.

Adaptive resource allocation for beamforming-based OFDMA systems

This paper has investigated adaptive resource allocation strategy for multiple-input-multiple-output(MIMO)orthogonal frequency division multiplexing access(OFDMA)systems,and proposed a beamforming-based transmit scheme as a concatenation of dynamic subcarriers,adaptive modulation and adaptive bit loading.The optimal goal is margin adaptive optimization,which minimize the total transmission power subject to a target BER performance constraint on eachsub-carrier and constant bit rate.Simulation results have shown that,compared with fixed allocation schemes,the presented scheme can improve the OFDMA performance significantly,thank to the multi-antenna array gain and the multiuser diversity gain.