Impairment Compensation ofLow-IF and Direct-Conversion OFDM Receivers

• Main Authors: David Yu, 余偉銓
• Other Authors: Chien-Hsing Wu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/84710368839731375835

碩士 === 國立中正大學 === 通訊工程研究所 === 96 === In orthogonal frequency division multiplexing (OFDM) communication systems, two major types of radio frequency front-end impairments, carrier frequency offset and in-phase/quadrature (I/Q) imbalance, degrade the demodulation performance of Low-IF and direct-conversion receivers severely. In this thesis, a low-IF OFDM receiver algorithm is proposed for the estimation and compensation of carrier frequency offset, I/Q imbalance and channel effects. Simulation results show that its performance is better than that of [1]. To further deal with frequency-selective I/Q imbalance issues in a direct conversion receiver, we develop a least-square data-aided compensator with good performance.