Baseband estimation and compensation of joint TX/RX I/Q imbalance in SC-FDE transceivers

Conference Paper · April 2009with7 Reads
DOI: 10.1109/CISS.2009.5054781 · Source: IEEE Xplore
Conference: Information Sciences and Systems, 2009. CISS 2009. 43rd Annual Conference on
Previous work on I/Q imbalance in SC-FDE transceivers investigates the effect of receiver I/Q imbalance but does not consider Doppler effects due to mobility. SCFDE in doubly-selective channels is studied without considering I/Q imbalance. In this paper, we derive an equivalent channel model for SC-FDE in the presence of both joint Tx/Rx I/Q imbalance and mobility and present an effective low-complexity digital baseband compensation scheme. Furthermore, we propose a novel joint channel and I/Q imbalance parameter estimation scheme for SC-FDE transceivers.
    • "Equipped with this model and IQ channel IQ Fig. 17 : Simplified block diagram for illustration of incorporating IQ imbalance at both the transmitter and the receiver. assuming x the transmit signal vector, the noise-free receive signal vectorˆxvectorˆ vectorˆx after equalization is derived in [18], [19] and given for OFDM transmission byˆx "
    [Show abstract] [Hide abstract] ABSTRACT: Millimeter wave (mmWave) communications are recognized as a key technology in 5G architecture by achieving highly boosted data rates due to the large available bandwidth. For proper mmWave air interface design, the impact of hardware impairments leading to performance degradations have to be considered adequately in practical systems. In this paper, we study the hardware aspects phase noise, non-linear power amplifiers, IQ imbalance, and analog-to-digital converter (ADC) resolution using appropriate models at mmWave frequency and evaluate the performance in an outdoor urban mmWave scenario. The respective influence on two air interfaces, namely, orthogonal frequency division multiplexing (OFDM) and single-carrier frequency domain equalization (SC-FDE), are analyzed and compared. It is shown that SC-FDE is much more robust against impairments from non-linear power amplifiers, IQ imbalance and ADC resolution than OFDM for a typical mmWave system configuration. Although this less robustness of OFDM systems is compensated by channel coding significantly, SC-FDE with minimum mean square error equalization can still outperform OFDM in some coded cases.
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  • [Show abstract] [Hide abstract] ABSTRACT: In our previous work, digital baseband compensation of joint Tx/Rx I/Q imbalance in mobile SC-FDE transceivers was investigated. In this sequel, the training sequence design for joint channel and I/Q imbalance parameter estimation in mobile SC-FDE transceivers is discussed in greater detail.
    Full-text · Conference Paper · Apr 2010
  • [Show abstract] [Hide abstract] ABSTRACT: In this sequel to [1], the joint Tx/Rx I/Q imbalance model of mobile SC-FDE transceivers is extended to include the effect of residual carrier frequency offset. Furthermore, the equivalent channel model for multiple-antenna spatially-multiplexed SC-FDE transceivers in the presence of I/Q imbalance and mobility is derived and an effective digital baseband compensation scheme is proposed, and its performance is evaluated including the effects of channel estimation.
    Conference Paper · Apr 2010