基于IEEE802.11a无线标准的STC-OFDM系统性能研究

提出了使用正交频分复用(OFDM)技术减少码间干扰(ISI)来改善频率选择性衰落信道下空时编码(STC)性能的合理方案。在IEEE802.11a无线标准下对STC与OFDM技术相结合后的STC-OFDM系统进行了理论分析,通过仿真对系统性能进行了评估。仿真结果表明,空时分组编码(STBC)与OFDM技术的结合优于垂直的贝尔实验室分层空时方案(VBLAST)与OFDM技术的结合;FFT点数与子载波数对系统性能有一定的影响;随机交织器有助于显著改善多径衰落信道下系统性能,并能在各种信道上达到合理的鲁棒性。

Performance study for STC-OFDM systems based on IEEE802.11a standard

This paper presents a reasonable program that use orthogonal frequency division multiplexing(OFDM) technology to reduce inter-symbol interference(ISI) to improve the performance of space-time coding(STC) under frequency selective fading channel.Analyze the STC-OFDM system under the combination STC and OFDM technology based IEEE802.11a wireless standards,and the performance of system is verified through simulation.Simulation results show that,the combination of STBC with OFDM technology is superior to the combination of VBLAST and OFDM technology.FFT points and the number of subcarriers of the system has a certain impact on performance.Random interleaver contribute significantly to improve the performance of system under multipath fading channel and get a reasonable robustness under a variety of channels.