IEEE 802.11a無線區域網路系統模擬及效能分析

正交分頻多工(OFDM)是一種多載波的解調技術，且具有許多優點，例如高頻寬效益、高資料傳輸量、抗通道衰弱、抗脈衝干擾、較少非線性失真等等。無線區域網路IEEE 802.11a 根據不同的通道品質提供6 Mb/s ~ 54 Mb/s 的資料傳輸速率供使用者選擇﹔於是，本論文針對IEEE 802.11a 的標準，進行實體層(Physical layer)部分之模擬，得到各種資料速率在AWGN以及band-limited channel的衰減通道下，位元錯誤率(BER)對訊號雜訊比(SNR)的關係研究結果。 WiMAX採用的調變及編碼技術都和802.11a相似¸我們可以進一步來修改目前建立的802.11a模擬環境來供WiMAX系統效能分析。

關鍵字

無線區域網路系統

並列摘要

OFDM (Orthogonal Frequency Division Multiplexing) is a form of multi-carrier modulation technique. High spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral density, capability of handling very strong echoes and less non linear distortion are among the favorite properties of OFDM. The IEEE 802.11a Wireless Local Area Network (WLAN) provides several data rates from 6 Mb/s to 54 Mb/s according to different channel quality. The aim of this thesis is to simulate the physical layer performance of the IEEE 802.11a system and to obtain the BER performance for various data rates in AWGN and band-limited channel channel. In the further work, this test bed could be modifed to evaluate the performance of WiMAX system which uses the similar modulation and coding scheme as that in 802.11a system.

並列關鍵字

IEEE 802.11a

參考文獻

[1] R. van Nee and R. Prasad, OFDM for Wireless Multimedia Communications. 2000.

[2]Shelswell, P.,”The COFDM modulation system: The heart of digital broadcasting,” Electronic and Communication Engineering Journal, Vol7, June, pp. 127-135, (1995).

[5] L. J. Cimini. Jr,”Analysis and simulation of a digital mobile channel using orthogonal frequency division multiplexing,” IEEE Trans. Commun., vol. COM-33, no. 7, pp.655-675, July 1985.

[6]ETSI, “Radio Broadcasting Systems: Digital Audio Broadcasting to Mobile, Portable and Fixed Receivers,” European Telecommunication Standard, ETS 300-401, Feb. 1995.

[8] R. Van Nee and R. Prasad, OFDM Wireless Multimedia Communications, Artech

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IEEE 802.11a無線區域網路系統模擬及效能分析

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