Time-Frequency Multiplex Estimator Design with Joint Tx IQ Imbalance, CFO, Channel Estimation, and Compensation for Multi-Carrier Systems

Juinn-Horng DENG  Kuo-Tai FENG  

Publication
IEICE TRANSACTIONS on Communications   Vol.E98-B   No.11   pp.2322-2329
Publication Date: 2015/11/01
Online ISSN: 1745-1345
Type of Manuscript: PAPER
Category: Wireless Communication Technologies
Keyword: 
carrier frequency offset (CFO),  in-phase and quadrature-phase (IQ) imbalance,  time-frequency mutiplex,  zero-IF transceiver,  

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Summary: 
A low-complexity time-frequency multiplex estimator and low-complexity equalizer transceiver design are proposed to combat the problems of RF impairment associated with zero-IF transceiver of multi-carrier systems. Moreover, the proposed preambles can estimate the transmitter (TX) in-phase and quadrature-phase (IQ) imbalance, carrier frequency offset (CFO), and channel impulse response parameters. The proposed system has two parts. First, all parameters of the impairments are estimated by the designed time-frequency multiplex estimator. Second, the estimated parameters are used to compensate the above problems and detect the transmitted signal with low complexity. Simulation results confirm that the proposed estimator performs reliably with respect to IQ imbalance, CFO, and multipath fading channel effects.