Carrier Frequency Offset estimation in MC-DS-CDMA systems with zero-IF receivers

Akbil, Brahim; Nsiri, Benayad; Ferré, Guillaume; Aboutajdine, D.

doi:10.1109/isvc.2010.5656246

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…The reason is the high variance of the estimator due to multiple parameter estimation even at high SNR values. A zero-Intermediate Frequency (IF) based frequency synchronization approach is given in [14]. This complexity of this algorithm is very high.…”

Section: Related Workmentioning

confidence: 99%

A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

Zeeshan

Khan

2022

Int. j. commun. netw. inf. secur.

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The future wireless communication systems demand very high data rates, anti-jamming ability and multiuser support. People want large amount of data to be continuously accessible in their personal devices. Direct Sequence (DS) spread spectrum based techniques such as Code Division Multiple Access (CDMA) fulfil these requirements but, at the same time, suffer from the Intersymbol Interference (ISI). Multicarrier CDMA (MC-CDMA) is an emerging technology to be used in mobile devices operating in an ad hoc setting due to its immunity towards ISI and having all the advantages of spread spectrum communication. One of the major problems with MC-CDMA is the high sensitivity towards carrier frequency offsets caused due to the inherent inaccuracy of crystal oscillators. This carrier frequency offset destroys the orthogonality of the subcarriers resulting in Intercarrier Interference (ICI). In this paper, we propose a computationally efficient algorithm based on Fast Fourier Transform (FFT) and biquadratic Lagrange interpolation. The FFT is based on the use of overlapping windows for each frame of the data instead of non-overlapping windows. This gives a coarse estimate of the frequency offset which is refined by the successive application of Lagrange quadratic interpolation to the samples in the vicinity of FFT peak. The proposed algorithm has been applied to the multiuser ad hoc network and simulated in Stanford University Interim (SUI) channels. It has been shown by simulations that the proposed algorithm provides better performance of almost 1~2 dB as compared to the well-known algorithms.

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Section: Related Workmentioning

confidence: 99%

A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

Zeeshan

Khan

2022

Int. j. commun. netw. inf. secur.

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“…Meanwhile, the acquisition is rather difficult due to the presence of Doppler shift incurred by high relative movement between LEO satellite and ground devices [12]. Several works have studied the synchronization problems for MC-DS-CDMA [13], [14]. Nevertheless, these analyses assume that the acquisition of received MC-DS-CDMA signal has already been completed.…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Joint Acquisition of Doppler Factor and Delay for MC-DS-CDMA in LEO Satellite System

Meng

2020

IEEE Access

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Low Earth Orbit (LEO) satellite systems have received considerable attentions for its advantages and potential applications in global communication. Yet LEO satellite-ground communication is challenged by the huge Doppler shift. This paper is devoted to studying how to deal with this challenge in Multi-carrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA) systems in the presence of multi-path and partial band interferences for LEO satellite-ground link in urban areas. To this end, we design a two-dimensional joint acquisition algorithm. Specifically, we acquire the delay and Doppler factor by solving the Maximum Likelihood (ML) problem with decision variable falling into two-dimensional uncertain region of the estimated parameters. We then use grid-based searching method to access the ML estimates of the delay and Doppler factor at the cost of acceptable complexity. We also derive the detection probability and Mean Square Error (MSE) in both Additive White Gaussian Noise (AWGN) and Rayleigh fading channels. It is shown that the performance of MC-DS-CDMA with the proposed algorithm significantly outperforms its single-carrier counterpart in Rayleigh fading channel, and is proved to be more tolerant to partial band interferences for both AWGN and Rayleigh fading scenarios. INDEX TERMS Low Earth Orbit (LEO) satellite system, Multi-carrier Direct Sequence Code Division Multiple Access (MC-DS-CDMA), two-dimensional joint acquisition, detection probability, Mean Square Error (MSE).

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A Novel Anti-interception Waveform in LEO Satellite System

Meng

Wang

2020

2020 IEEE 4th Information Technology, Networking, Electronic and Automation Control Conference (ITNEC)

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Carrier Frequency Offset estimation in MC-DS-CDMA systems with zero-IF receivers

Cited by 4 publications

References 11 publications

A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

A Robust Carrier Frequency Offset Estimation Algorithm in Burst Mode Multicarrier CDMA based Ad Hoc Networks

Two-Dimensional Joint Acquisition of Doppler Factor and Delay for MC-DS-CDMA in LEO Satellite System

A Novel Anti-interception Waveform in LEO Satellite System

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