一种基于多天线OFDMA的自适应调制方法
首发时间:2007-06-26
摘要:本文研究了基于智能天线技术的OFDMA系统。提出了一种基于多天线OFDMA系统中的简单自适应调制方法, 在保证一定BER的基础上提高了系统的频谱利用率。在低计算复杂度的基础上,提高了系统性能。同时,系统可以在不进行波束赋形和频域信道估计的情况下,通过前导序列得到信道状态信息,实现资源优化。在接收端,使用波束赋形技术以提高系统的性能。此外,本文基于802.16e WMAN标准,以及SUI-3信道模型,对系统的链路性能进行了仿真研究。
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A Simple Algorithm of Adaptive modulation Based on Antenna-Array in OFDMA Systems
Abstract:The OFDMA system using smart antennas technique is discussed. In the paper, a low complexity algorithm for adaptive modulation in array-antenna for OFDMA systems is proposed. This scheme can improve efficiency of spectrum with fixed BER. Meanwhile, the performance of the OFDMA system, which is a Low Complexity Algorithm, can be improved. Besides, the resource allocation algorithm is applied to the pilot data when no beam is formed and channel estimation in frequency-domain is implemented. At the receiver, the technique of beam-forming is implemented in order to improve the system performance. Simulations based on the SUI channel model according to the standard of IEEE 802.16e WMAN are carried out to examine the performance of the proposed approach.
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