Multi-rate MC-CDMA Multiuser Communication Systems with Adaptive Antenna Array

• Main Authors: Kun-Da Ke, 柯坤達
• Other Authors: Fang-Biau Ueng
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/53050728563331468336

碩士 === 國立中興大學 === 電機工程學系所 === 94 === This paper proposes the adaptive multi-rate multi-carrier code-division multiple access (MC-CDMA) communication system with the post-FFT type and pre-FFT type. In multipath fading channel, the transmitted signal suffers from effects, which are characterized as follows: in inter-chip interference (ICI), multiple access interference (MAI) and multi-user interference (MUI). In order to solve these problems, we propose three multi-rate methodologies - variable processing gain (VPG), variable chip rate (VCR) and multi-code systems to investigate the performance of the MC-CDMA communications processing in multipath fading environments. We employ Least-Mean-Square (LMS)-based and include the spreading code coefficients in receiver structures. The technique can reduce noise and interference; moreover, it can enhance efficiency and reliability.