摘要
建立了基于广义平稳不相关散射假设(WSSUS)下的多径时变信道模型。针对无线局域网(WLAN)的特点,从802.11a协议出发,从全信道和子信道两个角度分别建立信道模型,阐述了OFDM利用循环前缀对抗多径信道码间干扰(ISI)的机理,并仿真了不同多普勒频移对系统误码底板影响,结果表明OFDM系统对WLAN具有强大适应性。
The multipath and time-varing wireless channel model based on WSSUS is presented.According to the properties of WLAN,the authors model the channel from the point of view of the whole channel and subchannel based on 802.11a. The principle about OFDM resisting to multipath channel's ISI utilizing cyclic prefix is discussed.Doppler's effect on system error floor is considered. All the results show the OFDM 's powerful adaptability to WLAN.
出处
《电讯技术》
北大核心
2004年第2期166-170,共5页
Telecommunication Engineering
