Joint Low-Complexity Equalization and Carrier Frequency Offsets Compensation Scheme for MIMO SC-FDMA Systems

Al-Kamali, Faisal S.; Dessouky, Moawad I.; Sallam, Bassiouny M.; Shawki, F.; Al-Hanafy, Waleed; El‐Samie, Fathi E. Abd

doi:10.1109/twc.2012.012412.100789

Cited by 46 publications

(53 citation statements)

References 9 publications

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“…The I/Q imbalance is due to the amplitude and phase mismatches between the I and Q branch of the local oscillator whereas the CFO is due to the mismatch of carrier frequency at the transmitter and receiver. In [8][9][10], It is shown that the I/Q imbalance and CFO can cause a serious intercarrier interference and multiple access interference in SC-FDMA systems. In [8], the issue of CFO in SC-FDMA system is investigated for different basis functions: the discrete Fourier transform (DFT) and the discrete cosine transform (DCT).…”

Section: Introductionmentioning

confidence: 99%

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I/Q Imbalance Problem in SC-FDMA System with DCT and DFT Basis Functions

Al-Kamali

Sakran

Odhah

2015

Advances in Electrical Engineering

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In-phase/quadrature-phase (I/Q) imbalance is one of the most serious concerns in the practical implementation of the direct conversion receiver architecture. This paper investigates and analyzes the impacts of the I/Q imbalance on the performance of the single-carrier frequency-division multiple access (SC-FDMA) system with different basis functions by computer simulations only. The suitable phase and amplitude of I and Q branches that can be utilized in SC-FDMA system are studied and determined through simulations for different I/Q imbalance scenarios and different subcarrier mapping schemes. Simulation results show that the phase and amplitude of I and Q branches have significant effects on the bit error rate (BER) performance of the SC-FDMA system.

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Section: Introductionmentioning

confidence: 99%

“…In [8], the issue of CFO in SC-FDMA system is investigated for different basis functions: the discrete Fourier transform (DFT) and the discrete cosine transform (DCT). A new joint equalization and CFO for multiple-input multiple-output SC-FDMA system are proposed and investigated in [9].…”

Section: Introductionmentioning

confidence: 99%

I/Q Imbalance Problem in SC-FDMA System with DCT and DFT Basis Functions

Al-Kamali

Sakran

Odhah

2015

Advances in Electrical Engineering

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“…Also, the MMSE-ML detector does not involve the use of SIC on different spatial streams.A frequency domain (FD) decision feedback equalizer (DFE) based on MMSE criterion for MU SC-FDMA has been presented in [8]. The joint low complexity regularized zero forcing equalizer (JLRZF) presented in [9] performs equalization and CFOs compensation jointly but does not involve SIC over spatial streams. The iterative MIMO-DFE receiver for uplink SC-FDMA presented in [10] involves cancelling the interference in the present symbol from the previous detected symbol in the respective spatial streams.…”

Section: Introductionmentioning

confidence: 99%

A frequency domain joint MMSE-SIC equalizer for MIMO SC-FDMA LTE-A uplink

Sah

Surendar

Muthuchidambaranathan

2014

2014 International Conference on Electronics and Communication Systems (ICECS)

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Single carrier frequency division multiple access (SC-FDMA) has been adopted as the air interface for the uplink transmission in 3GPP long term evolution (LTE) and long term evolution advanced (LTE-A) systems because it has low peak-to average power ratio (PAPR). The performance of SC-FDMA system degrades in frequency selective fading channel because of the use of single carrier. Also, the performance of SC-FDMA system degrades when the orthogonality among subcarriers is lost due to the presence of carrier frequency offsets (CFOs) in the channel. In this paper, we have proposed a joint minimum mean squared error (JMMSE) successive interference cancellation (SIC) equalizer scheme that performs the frequency domain equalization (FDE) as well as the CFOs compensation jointly for multiple input multiple output (MIMO) SC-FDMA based LTE-A uplink system. The bit error rate (BER) performances of MMSE FDE and JMMSE-SIC equalizers have been compared and the simulation results show that the proposed equalizer performs better than the MMSE-FDE equalizer for multi-user (MU) MIMO SC-FDMA system.

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“…In addition to CFO estimation, various CFO compensation algorithms have also been proposed in the literature [24][25][26][27][28][29]. An interference cancelation scheme based on circular convolution is proposed in [24] while parallel interference cancelation is used in [25] for CFO compensation.…”

Section: Introductionmentioning

confidence: 99%

“…However, the method is computationally intensive as it requires inversion of a large matrix for satisfactory performance. A joint CFO compensation and channel estimation algorithm is proposed in [27] for multi-antenna SC-FDMA systems. Several time-domain CFO compensation schemes paired with successive interference cancelation and MU ordering are proposed in [24].…”

Section: Introductionmentioning

confidence: 99%

PARAFAC-based frequency synchronization for SC-FDMA uplink transmissions

Gul

Lee

2014

EURASIP J. Adv. Signal Process.

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Frequency synchronization is a critical requirement for single-carrier frequency division multiple-access (SC-FDMA) uplink transmissions. Based on the key observation that the received signal at the base station can be formulated as the parallel factor analysis model, we present a joint carrier frequency offset (CFO) estimation and compensation scheme for SC-FDMA uplink transmissions with interleaved sub-carrier allocation. The proposed scheme, employing identical training symbols, guarantees the identifiability of CFO estimation, allows the system to operate on full load, and it is readily extendible to multi-antenna base station (BS) reception. Comparisons with existing approaches in the literature reveal that the proposed algorithms provide lower complexity and superior performance.

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Joint Low-Complexity Equalization and Carrier Frequency Offsets Compensation Scheme for MIMO SC-FDMA Systems

Cited by 46 publications

References 9 publications

I/Q Imbalance Problem in SC-FDMA System with DCT and DFT Basis Functions

I/Q Imbalance Problem in SC-FDMA System with DCT and DFT Basis Functions

A frequency domain joint MMSE-SIC equalizer for MIMO SC-FDMA LTE-A uplink

PARAFAC-based frequency synchronization for SC-FDMA uplink transmissions

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