Iterative semi-blind multiuser detection for coded mc-cdma uplink system

Kafle, P.L.; Sesay, A.B.

doi:10.1109/tcomm.2003.814206

Cited by 22 publications

(10 citation statements)

References 12 publications

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“…In [5], the use of soft information for interference cancelation is exploited in MC-CDMA systems. An iterative semiblind receiver for coded MC-CDMA systems, able to deal with intracell and intercell interference, is proposed in [6]. A novel lowcomplexity PIC (Parallel Interference Cancelation) receiver for turbo coded MC-CDMA systems is also investigated in [7].…”

Section: Introductionmentioning

confidence: 99%

Joint Turbo Equalization and Multiuser Detection of MC-CDMA Signals With Low Envelope Fluctuations

Silva

Dinis

2009

IEEE Trans. Veh. Technol.

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Abstract-In this paper we consider the uplink transmission in MC-CDMA (MultiCarrier -Coded Division Multiple Access) systems. As other multicarrier signals, MC-CDMA signals have high envelope fluctuations and a high PMEPR (Peak-to-Mean Envelope Power Ratio) which leads to amplification difficulties. This is particularly important for the uplink transmission, since an efficient, low-cost power amplification is desirable at the MTs (Mobile Terminals). Moreover, the transmission over timedispersive channels destroys the orthogonality between spreading codes, which might lead to significant MAI (Multiple Access Interference) levels.To reduce the envelope fluctuations of the transmitted signals, while maintaining the spectral efficiency, the MC-CDMA signal associated to each MT (Mobile Terminal) is submitted to a clipping device, followed by a frequency-domain filtering operation. However, the nonlinear distortion effects can be high when an MC-CDMA transmitter with reduced envelope fluctuations is intended (e.g., a small clipping level and/or when successive clipping and filtering operations are employed).In this paper, we define an iterative receiver that jointly performs a turbo-MUD (MultiUser Detection) and the estimation and cancelation of the nonlinear distortion effects.Our performance results show that the proposed receiver structure allows good performances, very close to the linear receiver ones, even for high system load and/or when a PMEPR as low as 1.7 dB is intended for each MT.

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Section: Introductionmentioning

confidence: 99%

Joint Turbo Equalization and Multiuser Detection of MC-CDMA Signals With Low Envelope Fluctuations

Silva

Dinis

2009

IEEE Trans. Veh. Technol.

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“…Blind detectors have not made use of the known information about the spreading sequences of the other known users which results to the performance deterioration. A number of linear and nonlinear semi-blind detectors [4][5][6][7][8] were developed for CDMA systems, which improved the subspace blind method [9] by taking into account the knowledge of the spreading sequences of other users within the cell.…”

Section: Introductionmentioning

confidence: 99%

A Group-Blind MMSE Multi-User Detector Based on Subspace Tracking for MC-CDMA Uplink

Meng

Hong

et al. 2008

2008 4th International Conference on Wireless Communications, Networking and Mobile Computing

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In the multicarrier code division multiple access (MC-CDMA) uplink, the base station receiver has the knowledge of the spreading sequences of all the users within the cell, but not that of the users from other cells. In this paper, we present a novel semi-blind adaptive MMSE multi-user detector based on subspace tracking for MC-CDMA systems in such scenarios. We develop an modified MMSE detector which can combat the performance deterioration induced by eigenvalues estimation errors. Moreover, the proposed method exploits the orthogonal projection approximation subspace tracking (OPAST) algorithm for adaptive subspace estimation. This proposed detector makes use of the spreading sequences of all known users to suppress the intracell interference, while suppresses the intercell interference using the modified MMSE detector. Simulation results demonstrate that the proposed semi-blind multi-user detector offers substantial performance gains over the blind multi-user detection and the traditional semi-blind method in a MC-CDMA uplink environment.

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“…Hence, MC-CDMA is affected by multiuser access interference (MAI), which can be reduced by successive interference cancellation (SIC) at the base station, where users are detected in succession, and MAI is cancelled before detection of the next user takes place. For uplink communications, MC-CDMA has been investigated in [8] and [9]. In [10] MC-CDMA is analyzed in a multiuser multipath transmission.…”

Section: Introductionmentioning

confidence: 99%

MC-CDMA with SIC: Power Control by Discrete Stochastic Approximation and Comparison with OFDMA

Benvenuto

Carnevale

Tomasin

2006

2006 IEEE International Conference on Communications

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Orthogonal frequency division multiple access (OFDMA) and multicarrier code division multiple access (MC-CDMA) are possible candidates for the next generation of mobile wireless systems. However, when applied to an uplink broadband communication, MC-CDMA suffers from multiuser access interference, which can be reduced by using successive interference cancellation (SIC) at the base station. With this regard, here we propose an optimization of the MC-CDMA receiver that jointly determines power control and user detection ordering based on a discrete stochastic approximation algorithm. For OFDMA, we consider instead interleaved transmission and optimization of transmission power for each user. A comparison of OFDMA and MC-CDMA with SIC is then given in a multiuser uplink scenario in terms of sum-power for a required signal to noise ratio at the detection point.

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Iterative semi-blind multiuser detection for coded mc-cdma uplink system

Cited by 22 publications

References 12 publications

Joint Turbo Equalization and Multiuser Detection of MC-CDMA Signals With Low Envelope Fluctuations

Joint Turbo Equalization and Multiuser Detection of MC-CDMA Signals With Low Envelope Fluctuations

A Group-Blind MMSE Multi-User Detector Based on Subspace Tracking for MC-CDMA Uplink

MC-CDMA with SIC: Power Control by Discrete Stochastic Approximation and Comparison with OFDMA

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