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标题：Performance Evolutionary in AWGN Channel for 802.11a High Speed Network
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作者：Amarjeet ; Devesh Mahor ; Abhijit Kumar 等
期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：2
出版社：S.S. Mishra
摘要：FDMA, TDMA and CDMA are the well known multiplexing techniques used in wireless communication systems. While working with the wireless systems using these techniques various problems encountered are (1) multi-path fading (2) time dispersion which lead to intersymbol interference (ISI) (3) lower bit rate capacity (4) requirement of larger transmit power for high bit rate and (5) less spectral efficiency. With the investigation of 802.11a standard provides better solution for the above mentioned problem s. In 802.11a standard of multicarrier transmission, a single data stream is transmitted over a number of lower rate subcarriers to provide high data rates. 802.11a wireless standard provides a specification for distributing the data over a large number of carrie rs that are spaced apart at precise frequencies. This spacing provides the "orthogonality", which prevents the demodulator from seeing fr equencies other than their own. 802.11a wireless standard design includes simulation of wireless communication system was done with different modulation techniques such as BPSK, QPSK, 8PSK, 16PSK, QAM using MATLAB. From the simulation results, it is observed that the BPSK allows the BER and signal to noise ratio (SNR) to be improved in a noisy channel at the cost of maximu m data transmission capacity. As we investigate different modulation techniques allows higher transmission capacity, but at the cost of slight increase in the probability of error. From the results, the use of 802.11a wireless standard with QPSK is beneficial for short distance transmission link, whereas for long distance transmission link OFDM with BPSK will be preferable
关键词：communication transmission technology; OFDM; computer simulation; bpsk; Matlab