Space —Time Spreading Code Design for CDMA SystemsUsing Antenna Arrays on Transmitting Side

• Main Authors: pierce Chen, 陳弘政
• Other Authors: 方文賢
• Format: Others
• Language: zh-TW
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/71774302184217611783

碩士 === 國立臺灣科技大學 === 電子工程系 === 88 === Abstract In the 3rd generated wireless communication systems, direct-sequence spread-spectrum code-division multiple-access (CDMA) is adopted as a multiplexing structure. This is because direct-sequence spread-spectrum code-division multiple-access could gain significant advantage in the cellular network systems. Currently, non-orthogonal PN code and orthogonal code Walsh codes are frequently used in CDMA system, but multi-path and inter-symbol-interference could cause severe multiple access interference(MAI) in the received signal. Consequently, making use of the channel information, we design an orthogonal code on the receiving side, which help this system to reach higher capacity and lower bit error rate. We also use antenna arrays in both transmitted and received side. These arrays improve both the signal diversity and the channel capacity.