Uplink single-carrier frequency division multiple access system with joint equalisation and carrier frequency offsets compensation

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

doi:10.1049/iet-com.2010.0135

Cited by 24 publications

(26 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Instead of compensating for IIeff in frequency domain received signal (12), receiver initially seperate subcarriers alloted to each user from R to get received signal for kth user as (24) where Rk and Wk are M x 1 matrices denoting received signals and noise in subcarriers alloted to user k, II�f = E�IIef f and is substituted in (25) followed by IFFT operation to get an estimate of data transmitted by kth user. For the suboptimal compensation scheme, the joint compensation matrix involves product of two matrices II � ff (II � ff ) H which is of dimension M x N and inversion of matrix II � ff Rx(II � ff ) H + a'&rIM which is of dimen sion MxM.…”

Section: B Suboptimal Effective Ici Compensation Schemementioning

confidence: 99%

See 1 more Smart Citation

Effective ICI matrix and its compensation in SCFDMA communication system

Ali

2015

2015 7th International Conference on Communication Systems and Networks (COMSNETS)

View full text Add to dashboard Cite

DFT spread OFDMA popularly known as Single carrier frequency division multiple access (SCFDMA) is an emerging wireless standard and has received considerable at tention because of its ability to incorporate advantages of single carrier modulation with OFDMA. Even though SCFDMA has low peak to average power ratio (PAPR) and resistance to frequency nulls of the channel, it inherits some drawbacks from OFDMA.Frequency synchronization between transmitter and receiver in mobile environment and resulting performance degradation is one such issue especially in uplink communication. After the standardization of SCFDMA as uplink standard for LTE, fre quency synchronization is an active area of research. In this paper SCFDMA system is analysed in the presence of CFO and the results of analysis is utilized in framing an efficient representation to the multidimensional frequency synchronization problem as effective ICI matrix and a method to jointly compensate effective ICI matrix and equalize the channel is proposed based on minimum mean square error criterion and its performance is compared with the existing schemes.

show abstract

Section: B Suboptimal Effective Ici Compensation Schemementioning

confidence: 99%

“…The periodic nature of transmitted signal in interleaved SCFOMA system is utilized in reducing the complexity of the system. In [12] SCFOMA is analysed in the presence of CFa and resulting impairments are stated. In order to alleviate impairments SUD and CCO schemes are extended to SCFDMA frame work.…”

Section: Introductionmentioning

confidence: 99%

Effective ICI matrix and its compensation in SCFDMA communication system

Ali

2015

2015 7th International Conference on Communication Systems and Networks (COMSNETS)

View full text Add to dashboard Cite

show abstract

“…All of these technologies require good channel estimation support. Therefore, accurate channel estimation can significantly improve the performance of the SC-FDMA system [4,5]. However, numerous experimental studies undertaken by various researchers in the recent past have shown that wireless channels associated with a number of scattering environments tend to exhibit sparse structures in the sense that majority of the channel taps end up being either zero or below the noise floor when operating at large bandwidths and symbol durations and/or with a large plurality of antennas [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Sparse Channel Estimation of Single Carrier Frequency Division Multiple Access Based on Compressive Sensing

2015

J Inf Process Syst

View full text Add to dashboard Cite

It is widely accepted that single carrier frequency division multiple access (SC-FDMA) is an excellent candidate for broadband wireless systems. Channel estimation is one of the key challenges in SC-FDMA, since accurate channel estimation can significantly improve equalization at the receiver and, consequently, enhance the communication performances. In this paper, we study the application of compressive sensing for sparse channel estimation in a SC-FDMA system. By skillfully designing pilots, their patterns, and taking advantages of the sparsity of the channel impulse response, the proposed system realizes channel estimation at a low cost. Simulation results show that it can achieve significantly improved performance in a frequency selective fading sparse channel with fewer pilots.

show abstract

“…The work given in [15] handles only the CFO estimation problem and is applicable only for an interleaved CAS system. In [16], the authors propose a minimum mean square error (MMSE) equaliser, which jointly performs equalisation and carrier frequency offsets (CFOs) compensation in Single Carrier frequency Division Multiple Access (SC-FDMA) systems. A low complexity implementation of the method trades performance for reduction in computation load.…”

Section: Introductionmentioning

confidence: 99%

A firefly technique for estimation of carrier frequency offsets in OFDMA uplink

Thafasal

Sameer

2013

IEEE 2013 Tencon - Spring

View full text Add to dashboard Cite

In this paper we propose to use a recently-developed meta-heuristic algorithm called Firefly Algorithm for joint maximum-likelihood (ML) estimation of carrier frequency offsets (CFO) in an OFDMA uplink. We make use of a pilot preamble for prior estimation of the CFOs in a quasi-static environment. We also introduce a new distance metric that guide the evolution of the fireflies to the optimum solution. This metric is specifically formulated for this problem based on the cost function used. The algorithm gives very good performance with reasonable computational complexity and has the added flexibility of a tradeoff between the population and generation size and performance. Performance is found to be better than many prevailing methods. It is also suitable for all subcarrier assignment schemes employed in OFDMA systems. The advantages of the proposed method are validated through computer simulation.Index Terms-Orthogonal frequency division multiple access (OFDMA), channel estimation, carrier frequency offset (CFO), Firefly Algorithm (FA), maximum likelihood estimation (MLE)

show abstract

Uplink single-carrier frequency division multiple access system with joint equalisation and carrier frequency offsets compensation

Cited by 24 publications

References 11 publications

Effective ICI matrix and its compensation in SCFDMA communication system

Effective ICI matrix and its compensation in SCFDMA communication system

Sparse Channel Estimation of Single Carrier Frequency Division Multiple Access Based on Compressive Sensing

A firefly technique for estimation of carrier frequency offsets in OFDMA uplink

Contact Info

Product

Resources

About