Wireles channel modeling has always been the subject to active research, due to continual advancements of wireless technologies. Many of the future wireless sevices to be provided by the future generation mobile communication limited temporal or multipath diversity. This is the reason why most of the communication research that is going on concentrates on relazation of indoor environments. The IEEE802.11TGn has been modelded an indoor environments in their channel model A to F. The classificcation depends on various numbers of cluster, delay spreads, angle of arrival, angle of departure, and LOS/NLOS condition. Channel model D represent large office environments with 50ns delay spread and non-line of sight condition. The objective of this paper is to verify the performance of wireles LAN IEEE802.11n under channel model D. Three diffrent modulation coding schemes were conducted. The eror performance was shown in water-fall curve of BER and PER versus SNR Keywords: Wireles LAN 802.11n, Channel Model D