Frequency-Selective Joint Tx/Rx I/Q Imbalance Estimation Using Golay Complementary Sequences

Rodriguez-Avila, R.; Nunez-Vega, G.; Parra-Michel, R.; Méndez-Vázquez, Andres

doi:10.1109/twc.2013.040213.120622

Cited by 16 publications

(6 citation statements)

References 19 publications

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“…For example, replacing the direct conversion architecture (DCA) with a superheterodyne configuration scheme with low cost and lower power utilization in silicon compared to the super heterodyne can lead to an imbalance of Inphase and Quadrature (IQ). IQ imbalance can be described as the difference between the gain, phase, and even frequency response of each orthogonal branch of communication systems [4,5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Channel Estimation and Carrier Frequency Offset Compensation in Orthogonal Frequency Division Multiplexing System Using Adaptive Filters in Wavelet Transform Domain

Fereydouni

Charmin

Vahdaty

et al. 2020

IJE

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In this paper, a combination of channel, receiver frequency-dependent IQ imbalance, and carrier frequency offset estimation under short cyclic prefix length is considered in orthogonal frequency division multiplexing system. An adaptive algorithm based on the set-membership filtering algorithm is used to compensate for these impairments. In short CP length, per-tone equalization structure is used to avoid inter-symbol interference. Due to CFO impairment and IQ imbalance in the receiver, we will expand the PTEQ structure to a two-branch structure. This structure has high computational complexity, so using the set-membership filtering idea with variable step size while reducing the average computation of the system can also increase the convergence speed of the estimates. On the other hand, applying wavelet transform on each branch of this structure before applying adaptive filters will increase the estimation speed. The proposed algorithm will be named SMF-WP-NLMS-PTEQ. The results of the simulations show better performance than the usual adaptive algorithms. Besides, estimation and compensation of channel effects, receiver IQ imbalance and carrier frequency offset under short CP can be easily accomplished by this algorithm.

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Section: Introductionmentioning

confidence: 99%

“…Equation (4) clearly shows that the received signal is first distorted by the channel, then the resulting signal is affected by the CFO, and is eventually re-distorted by the receiver IQ. To compensate for CFO and IQ, the CFO is first estimated.…”

mentioning

confidence: 99%

Channel Estimation and Carrier Frequency Offset Compensation in Orthogonal Frequency Division Multiplexing System Using Adaptive Filters in Wavelet Transform Domain

Fereydouni

Charmin

Vahdaty

et al. 2020

IJE

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“…These schemes can estimate fractional and integral CFO using repetitive pilot patterns. A scheme with similar scope has been proposed in another study; this is a low‐complexity scheme, which exploits the statistical properties of Golay complementary sequences. However, this scheme does not take CFO into account.…”

Section: Introductionmentioning

confidence: 99%

Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections

Ali

Sandhu

Waqar

et al. 2017

Int J Communication

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The aim of this article is to design a simple receiver, which can jointly estimate the frequency selective channel impulse response, frequency independent transmit/receive IQ imbalance, and carrier frequency offset with minimal training and implementation complexity. The estimation of carrier frequency offset is performed using 2 scalable solutions. To estimate the frequency selective channel impulse response and frequency independent transmit/receive IQ imbalance, we proposed 2 different estimation techniques. The first technique is an iterative approach stemming from a doubly linear model of the transmission system in the presence of transmit/receive IQ imbalance and frequency selective channel impulse response, while the second approach is a least squares solution. Both these schemes provide a good performance/complexity trade-off. Although the iterative estimates of channel impulse response are not optimal, they do provide a near ideal bit error performance. The proposed scheme blends seamlessly with Institute of Electrical and Electronics Engineers 802.11 standard but can be adapted to work with any orthogonal frequency-division multiplexing standard. KEYWORDSCFO and IQ imbalance estimation, direct conversion devices, multicarrier systems 1 Int J Commun Syst. 2017;30:e3277. wileyonlinelibrary.com/journal/dac How to cite this article: Ali MA, Sandhu MY, Waqar O, Rahimo AQ. Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections. Int J Commun Syst. 2017;30:e3277.

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“…There are a number of techniques proposed in the literature to jointly estimate Tx and Rx I/Q imbalances as well as CFO [3][4][5][6][7][8][9]. However, most of them deal with the problem of compensation for these impairments at receiver rather than pre-compensation at transmitter [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

“…Channel and CFO estimation then becomes much simpler after I/Q imbalance compensation. We also propose very simple frequency domain training sequences rather than the conventional Golay complementary sequences [9] for joint Tx and Rx I/Q imbalance estimation.…”

Section: Introductionmentioning

confidence: 99%

Joint transmitter and receiver I/Q imbalance estimation in presence of carrier frequency offset

Huang

Zhang

Guo

2015

2015 15th International Symposium on Communications and Information Technologies (ISCIT)

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Abstract-This paper proposes a simple frequency domain joint transmitter and receiver I/Q imbalance estimation method which exploits the phase rotation introduced by carrier frequency offset. Using two frequency domain training sequences inserted in each transmission frame, the transmitter and receiver I/Q imbalances can be jointly estimated over multiple frames. The transmitter I/Q imbalance parameter can be fed back to the transmitter for I/Q imbalance pre-compensation, whereas the receiver I/Q imbalance can be compensated locally followed by conventional frequency domain equalization. Numerical simulation results show that the image rejection ratios for both transmitter and receiver after I/Q imbalance compensation can be improved to over 50 dB which is necessary for multichannel systems with high order modulation and wide transmission bandwidth.Index Terms-I/Q imbalance, image rejection, carrier frequency offset, spectral efficiency, and multichannel system.

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Frequency-Selective Joint Tx/Rx I/Q Imbalance Estimation Using Golay Complementary Sequences

Cited by 16 publications

References 19 publications

Channel Estimation and Carrier Frequency Offset Compensation in Orthogonal Frequency Division Multiplexing System Using Adaptive Filters in Wavelet Transform Domain

Channel Estimation and Carrier Frequency Offset Compensation in Orthogonal Frequency Division Multiplexing System Using Adaptive Filters in Wavelet Transform Domain

Receiver design for multicarrier transmission systems in presence of Tx/Rx imperfections

Joint transmitter and receiver I/Q imbalance estimation in presence of carrier frequency offset

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