來源資料
題 名 | 基於正交分頻多工調變技術之高速率無線區域網路傳收機設計與實作=Orthogonal Frequency Division Multiplexing Based High Data Rate Transceiver for Wireless Local Area Network Applications |
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作 者 | 劉家宏; 文星超; |
書刊名 | 電信研究 |
卷 期 | 35:2 民94.04 |
頁 次 | 頁251-273 |
分類號 | 448.84 |
關鍵詞 | 循環前置區間; 數位訊號處理; 等化器; 快速傅利葉轉換; 符元間干擾; 正交分頻多工調變; 正交幅度調變; 無線區域網路; Cyclic prefix; Digital signal processor; Equalizer; Fast fourier transform; Inter-symbol interference; Orthogonal frequency division multiplexing; Quadrature amplitude modulation; Wireless local area network; |
語 文 | 中文(Chinese) |
中文摘要 | 隨著多媒體服務應用的日益增加,通訊系統將需要具備更大的傳輸頻寬與更高的傳輸速度,以提供快速的、即時的、可靠的以及高品質的通訊服務。特別是在無線通訊系統方面的應用,更是近年來熱門的研發領域,所以新近的系統與標準都是朝向發展更高速的傳輸技術來努力,以在有限的無線電頻寬上滿足多媒體應用的需求,例如整合封包無線電服務(General Packet Radio Service, GPRS)、寬頻分碼多重進接技術(Wideband Code Division Multiple Access, WCDMA)、高速下行分封接取技術(High Speed Downlink Packet Access, HSDPA)、分碼多重進接2000技術(code division multiple access 2000, cdma2000)、無線區域網路(Wireless Local Area Network, WLAN)、無線都會網路(Wireless Metropolitan Area Network, WMAN)、以及行動寬頻無線接取網路(Mobile Broadband Wireless Access, MBWA)等。 在本篇論文中,我們將介紹一個應用於無線區域網路的高速率通訊系統,此系統是根據IEEE 802.11a正交分頻多工調變技術(Orthogonal Frequency Division Multiplexing, OFDM)標準所設計與實現。正交分頻多工調變技術是一種相當可靠且適合於高速率傳輸的新型調變技術。在本論文中,將對正交分頻多工調變技術的基本原理與功能特色做基本的介紹,並且詳細介紹我們所設計的系統中各個功能方塊的運作原理與相關規格,包括外部傳收機(Outer Transceiver)與內部傳收機(Inner Transceiver)。然後透過電腦模擬,我們分別在加成白色高斯雜訊(Additive White Gaussian Noise, AWGN)與無線區域網路通道環境下,計算所設計高速率無線通訊系統的效能。除此之外,我們還利用德州儀器(Texas Instrument, TI)所提供的評估板(Evaluation Module board, EVM board)來實現所設計的高速率無線通訊系統。並且透過我們所設計的圖形化人機介面(Graphic User Interface, GUI),將可進行即時的多媒體傳輸展示。 |
英文摘要 | With the increasing applications of diverse multimedia services, larger transmission Band width and higher data rate are required to establish a real-time, reliable and high quality communication systems, especially for the wireless communication systems. Due to the limited radio spectrum, new technologies are proposed and developed to provide high speed transmission for multimedia service. Several wireless communication systems are designed and constructed for this purpose, such as general packet radio service (GPRS). Wideband code division multiple access (WCDMA), high speed downlink packet access (HSDPA), code division multiple access 2000(cdma2000), wireless local area network (WLAN), wireless metropolitan area network (WMAN), and mobile broadband wireless access (MBWA). In this paper, we present a high data rate WLAN system, which is designed and implemented according to IEEE 802.11a orthogonal frequency division multiplexing (OFDM) systems. OFDM is the enabling modulation technique which is reliable and suitable for high data rate transmission. The mechanism and characteristics of OFDM are also discussed in the paper. Computer simulations are conducted to evaluate the performance of the high data rate wireless transceiver both in additive white Gaussian noise (AWGN) and WLAN fading channels. Furthermore, a real-time implementation of the high data rate wireless transceiver using TI evaluation module (EVM) board is presented. By the use of self-designed graphic user interface (GUI), the high data rate WLAN system can be programmed to perform a multimedia transmission demonstration. |