Highly Accurate Blind Carrier Frequency Offset Estimator for Mobile OFDM Systems

Li, X.; Like, Eric C.; Wu, Zhiqiang; Temple, Michael A.

doi:10.1109/icc.2010.5502820

Cited by 6 publications

(13 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In uniform quantization approach, 15,16 in order to get an estimate of CFO, the range of ϵ q is quantized into μ equal levels, such that the vectorε ¼ε 1ε2 ⋯ε Q Â can take μ Q values. In uniform quantization approach, 15,16 in order to get an estimate of CFO, the range of ϵ q is quantized into μ equal levels, such that the vectorε ¼ε 1ε2 ⋯ε Q Â can take μ Q values.…”

Section: Uniform Quantization Approachmentioning

confidence: 99%

“…From the above discussion, it is clear that both uniform quantization and FFA-based approach require repeated evaluation of the objective function in (14), which involves 2 steps. The second step is the reconstruction of an estimate of received signal, by applying each x q;ε q ðnÞ in (15). For a data sequence of length M, this step involves a total of M complex multiplications per user.…”

Section: Complexity Comparisonmentioning

confidence: 99%

“…Here, FBSCFDMA TF is developed based on (2) and is truncated to order L = KN. The figure also illustrates the performance of uniform quantization scheme, 15 with μ = 5. The BER performance of precoded schemes (both SCFDMA and FBSCFDMA) is superior compared with OFDMA and FBMC system, mainly because of the diversity gain associated with the precoding.…”

Section: Sensitivity To Cfo and Firefly-based Ici Compensationmentioning

confidence: 99%

“…5 Orthogonality between subcarriers is an essential aspect of the performance of OFDMA system. Li et al 15,16 propose a total ICI compensation scheme for OFDM system, based on the orthogonality of interference matrix. Furthermore, millions of devices will be connected to the network.…”

Section: Introductionmentioning

confidence: 99%

“…In the future communication scenario, the spectrum will be shared among users having diverse transmission strategies and different subcarrier bandwidths. In Deepak and Ali, 17 we have extended the total ICI compensation scheme 15 to higher order modulation using FFA, whereas 18 concentrates on the multiuser uplink scenario. 6,7 It is challenging to ensure orthogonality in such a scenario.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Sensitivity of filter bank SCFDMA to carrier frequency offset and its compensation using firefly algorithm

Ali

2018

Int J Communication

View full text Add to dashboard Cite

This paper proposes an efficient wireless uplink strategy named filter bank single carrier frequency division multiple access. The proposed system combines the low peak-to-average power ratio of precoded orthogonal frequency division multiple access with the reduced out-of-band emission of filter bank multicarrier scheme. We present a complete mathematical analysis of the proposed model and derive the conditions to be fulfilled by the transmit filter for perfect data recovery. We further introduce a transmit filter design to enhance the peak-to-average power ratio and out-of-band emission characteristics of the proposed system. This paper also analyzes the sensitivity of the filter bank single carrier frequency division multiple access system to carrier frequency offset (CFO) and suggests a low complexity interference compensation scheme, under the assumption of perfect knowledge of CFO at the receiver. Later on, the assumption on CFO parameter is removed, and a blind interference compensation technique based on firefly algorithm is developed. Finally, a detailed simulation study is performed to substantiate the effectiveness of the proposed methods.KEYWORDS carrier frequency offset, filter bank multicarrier, firefly algorithm, out-of-band emission, peak-toaverage power ratio, precoded OFDMA

show abstract

Section: Uniform Quantization Approachmentioning

confidence: 99%

Section: Complexity Comparisonmentioning

confidence: 99%

Section: Sensitivity To Cfo and Firefly-based Ici Compensationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Sensitivity of filter bank SCFDMA to carrier frequency offset and its compensation using firefly algorithm

Ali

2018

Int J Communication

View full text Add to dashboard Cite

show abstract

Timing‐deviation and frequency‐offset estimations for multicarrier transmission in high mobility environments using deep neural network

Wu,

Geng,

Chen

et al. 2023

Int J Communication

View full text Add to dashboard Cite

SummaryThe multicarrier technology used in fourth‐generation (4G) and fifth‐generation (5G) communications is quite susceptible to multipath fading and Doppler frequency shift, which is more prominent in high mobility environments. Therefore, the accuracy of timing and frequency synchronization impacts the overall system performance significantly. Existing synchronization methods rely on the correlation of the preamble sequences and are, hence, vulnerable to severe multipath effect and Doppler effect. In this article, we propose a novel scheme leveraging deep neural network (DNN) to achieve high‐precision synchronization in high mobility environments. Concretely, a convolutional neural network (CNN) architecture is proposed to extract the hidden features of received signals for timing deviation estimation. In the following, a fully connected (FC) model is demonstrated to classify the optimal carrier frequency offset (CFO) estimate from several CFO candidates. The proposed synchronization scheme is assessed under extended vehicular A (EVA) channel with various Doppler frequency shifts. Simulation results corroborate that the proposed DNN‐based scheme achieves a significant performance gain over the conventional correlation methods, and the proposed timing deviation estimation scheme exhibits an excellent complexity reduction; wherefore, it is extremely promising for multicarrier transmission systems in high mobility environments.

show abstract

Blind Estimation of Multiple Carrier Frequency Offsets in OFDMA Uplink Systems Employing Virtual Carriers

Phoong

2020

IEEE Access

View full text Add to dashboard Cite

The estimation of carrier frequency offset (CFO) is a challenging issue in uplink orthogonal frequency division multiple access (OFDMA) systems. Many estimation methods have been proposed in the past. However most existing methods are derived under specified carrier assignment schemes (CAS). In this paper, we propose a new blind algorithm exploiting the virtual carriers or un-used subchannels for the estimation of multiple CFOs. Our method can be applied to general CAS. Only one OFDM block is needed to obtain the CFO estimates. In order to reduce the complexity, we derive a closed form formula when the CFO is small and also develop a two-step algorithm for larger CFO range. The proposed algorithms reduce the computational complexity significantly. Numerical simulations are provided to show the effectiveness of the proposed methods.INDEX TERMS Carrier assignment scheme (CAS), carrier frequency offset (CFO), estimation, multiuser, orthogonal frequency division multiple access (OFDMA).

show abstract

Highly Accurate Blind Carrier Frequency Offset Estimator for Mobile OFDM Systems

Cited by 6 publications

References 10 publications

Sensitivity of filter bank SCFDMA to carrier frequency offset and its compensation using firefly algorithm

Sensitivity of filter bank SCFDMA to carrier frequency offset and its compensation using firefly algorithm

Timing‐deviation and frequency‐offset estimations for multicarrier transmission in high mobility environments using deep neural network

Blind Estimation of Multiple Carrier Frequency Offsets in OFDMA Uplink Systems Employing Virtual Carriers

Contact Info

Product

Resources

About