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《Journal of Anyang Teachers College》 2004-05
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The IEEE 802.11 Specifications and of DirectSequence Spread Spectrum

SHI Chuang-ming(Computer Science Department of Anyang Teacher's College,Anyang 455002,China)  
The IEEE 802.11 specifications address both the Physical (PHY) and Media Access Control (MAC) layers and are tailored to resolve compatibility issues between manufacturers of Wireless LAN equipment. Direct sequence spread spectrum, also known as direct sequence code division multiple access (DS-CDMA), is one of two approaches to spread spectrum modulation for digital signal transmission over the airwaves. In direct sequence spread spectrum, the stream of information to be transmitted is divided into small pieces, each of which is allocated across to a frequency channel across the spectrum. A data signal at the point of transmission is combined with a higher data-rate bit sequence (also known as a chipping code) that divides the data according to a spreading ratio. The redundant chipping code helps the signal resist interference and also enables the original data to be recovered if data bits are damaged during transmission.
【CateGory Index】: TP393
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【Co-references】
Chinese Journal Full-text Database 5 Hits
1 CHENG Tai kun, \ AN Jian ping (Dept. of Electronics Engineering, Beijing Institute of Technology, Beijing100081, China);Complementary Codes and Complementary Code Keying in WLAN[J];Journal of Beijing Institute of Technology;2002-04
2 Li Qiang Li Shaoqian (National Key Laboratory of Communication, UEST of China Chengdu 610054);Performance Analysis of Coded Modulation Concatenated CCK and Low-Density Parity-Check Code[J];Journal of University of Electronic Science and Technology of China;2003-05
3 Zheng De-shan (Fujian province Meizhouwan industrial college, Fujian Putian, 351254, China );The Technology of Wireless Local Area Network and its Application[J];Electronics & Packaging;2005-07
4 WANG Xiaofeng,WANG Binghe (Department of Communication Engineering, Engineering College of the Chinese People's Armed Police Force,Xi'an 710086,China);Key Technology and Application of Wireless LAN[J];Aeronautical Computer Technique;2003-03
5 ZHANG Xiu-yan~1, WANG Zhi-bin~2, TAO Guo-bin~1(1. Faculty of Electricity and Information Engineering, Daqing Petroleum Institute, Daqing 163318, China; 2. Northeast Agricultural University, Harbin 150030, China);THE EXPLORES OF COMPLEMENTARY CODE KEYING IN WLANS[J];Journal of Jiamusi University(Natural Science Edition);2004-03
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