Proceedings ArticleDOI
An adaptive approach to mitigate the effects of I/Q imbalance and multipath channel
Khandker Nadya Haq,Kah-Seng Chung +1 more
- pp 550-555
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TLDR
Computer simulations have shown that the proposed scheme is effective in mitigating the combined effects of I/Q imbalance and multipath fading for QPSK and 16-QAM modulation.Abstract:
It is well known that dual-branch receivers suffer from in-phase (I) and quadrature (Q) imbalance problems resulting in distortion and poor signal quality. This paper presents a novel technique, incorporating adaptive estimation and compensation, to mitigate the combined effects of I/Q imbalance and multipath channel on the received signal. Estimation of the channel and I/Q imbalance parameters is performed in time domain using a training sequence. Based on the estimated I/Q imbalance and channel parameters, signal compensation are performed in the frequency domain. Computer simulations have shown that the proposed scheme is effective in mitigating the combined effects of I/Q imbalance and multipath fading for QPSK and 16-QAM modulation. The Symbol Error Rate (SER) achieved for the compensated 16-QAM signal is 10-4, at an SNR of 20dB, which is the same for ideal 16-QAM signal, at an SNR of 19dB.read more
Citations
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Proceedings ArticleDOI
Correction of in phase-quadrature imbalance in the presence of multipath fading
TL;DR: This paper proposes an adaptive approach which involves first correcting for the I/Q imbalance before the signal is compensated for the effect of multipath fading, and verified the effectiveness of the proposed scheme.
References
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Advanced methods for I/Q imbalance compensation in communication receivers
TL;DR: In this paper, the authors carried out general signal analysis of an imbalanced I/Q processing receiver and proposed novel methods for I and Q imbalance compensation using baseband digital signal processing.
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An investigation into time-domain approach for OFDM channel estimation
Hlaing Minn,Vijay K. Bhargava +1 more
TL;DR: A time-domain based channel estimation for OFDM system with pilot-data multiplexed scheme and simulation results show that proposed method achieves almost the same performance as DFT-based LMMSE method and better BER performance than the other methods while keeping less complexity.
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Circularity-Based I/Q Imbalance Compensation in Wideband Direct-Conversion Receivers
TL;DR: Two novel blind low-complexity I/Q imbalance compensation techniques are proposed and analyzed to digitally enhance the analog FE image attenuation in wideband direct-conversion receivers and can provide very good compensation performance with low computational resources and are robust in the face of different imbalance levels and dynamics of the received signals.
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