Simulations of SC-FDMA transceiver with smart array antenna based on Robust Nulling Method

• Main Authors: Yu-Ting Wang, 王郁婷
• Other Authors: Jeich Mar
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/49248198723117181525

碩士 === 元智大學 === 通訊工程學系 === 101 === In this thesis, the performance of uplink SC-FDMA transceiver is simulated to determine the signal-to-interference-plus-noise ratio (SINR) of target bit error rate (BER) for different user speeds as well as modulation and code rate combinations. Intelligent wireless communications system design requires estimating the SINR in order to modify the transmission parameters to make efficient use of system resources autonomously. Therefore, a robust null-extension based SINR estimation scheme in the multipath angular spread environments is studied for receiving beamforming, which uses an improved beamforming weight algorithm. The study items include: First, the diversity combining techniques including selection combining (SC), maximal ratio combining (MRC) and equal gain combining (EGC) for improving the performance of single input multiple output (SIMO) SC-FDMA transceiver is studied. Secondly, we will study a multi-mode smart antenna, which includes (1) digital beamforming mode to steer the main beam at the direction of the target; (2) direction of arrival (DOA) mode which uses generalized of multiple signal classification (GMUSIC) algorithm to estimate the DOA and angular spread; (3) nulling mode to maximize desired signal power and minimize interference signal power. Finally, a robust adaptive null-extension based SINR estimation scheme is studied in the multipath angular spread environments.