MMSE detection of multicarrier CDMA

Miller, S.L.; Rainbolt, B.J.

doi:10.1109/49.895040

Cited by 79 publications

(70 citation statements)

References 9 publications

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“…For both MC-CDMA and MC-DS-CDMA systems, the transmitted signal of user can be expressed in the complex analytic form as [3] (1) where denotes the th data symbol with duration , the average transmitted power, the normalized spreading waveform at the th sub-carrier of user , respectively, and is the modulation frequency at the th sub-carrier with the reference frequency.…”

Section: A Transmitted Signal Modelmentioning

confidence: 99%

“…Then, the received signal of a multicarrier CDMA system contributed by the th user without the effect of noise can be represented as [1], [3] …”

Section: B Channel Modelmentioning

confidence: 99%

“…Both multicarrier CDMA systems exhibit the capability of mitigating the effect of frequency-selective fading without using the RAKE receiver. Based on these two originating work, a number of multiuser detection schemes applied in the context of multicarrier CDMA systems can also be found in recent publications [3]- [7].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Asynchronous Long-Code Multicarrier CDMA Systems With Correlated Fading

Chien

Hwang

Kuo

2005

IEEE Trans. Commun.

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Abstract-The effects of inter-carrier interference (ICI) and aperiodic random spreading sequences on the performance of asynchronous multicarrier code-division multiple-access (CDMA) systems with correlated fading between sub-carriers are investigated in this research. To conduct theoretical analysis for the maximal ratio combining (MRC) receiver, random parameters including asynchronous delays, correlated Rayleigh fading, and spreading sequences are averaged to find the unconditional covariance matrix of the interference-plus-noise vector. We demonstrate that the ICI in the system proposed by Kondo and Milstein (1996) can be mitigated by assigning a common random spreading sequence over all sub-carriers for each user, rather than using a set of distinct spreading sequences, where code sequences are assumed perfectly time-synchronized. Moreover, the analytic expression for the bit error probability (BEP) can be obtained with the Gaussian approximation. Simulation results are used to demonstrate the accuracy of our analysis. Various design tradeoffs including the number of sub-carriers, fading correlations, ICI and multipath effect are presented in simulation. We conclude that, when properly choosing a sufficiently large number of sub-carriers, the benefit of mitigating multipath interference and exploiting potential hidden frequency diversity shall prevail the impairment brought by increased ICI.Index Terms-Asynchronous transmission, code division multiple access (CDMA), correlated fading, inter-carrier interference (ICI), multicarrier CDMA, random signature sequence.

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Section: A Transmitted Signal Modelmentioning

confidence: 99%

“…Then, the received signal of a multicarrier CDMA system contributed by the th user without the effect of noise can be represented as [1], [3] …”

Section: B Channel Modelmentioning

confidence: 99%

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Analysis of Asynchronous Long-Code Multicarrier CDMA Systems With Correlated Fading

Chien

Hwang

Kuo

2005

IEEE Trans. Commun.

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“…Minimum mean squared error (MMSE) detection suppresses the multiple access interference (MAI) while still providing frequency diversity [5], [6]. Antenna arrays provide a more powerful alternative means to reduce MAI whilst providing spatial diversity.…”

Section: Mmse Multiuser Detection For Array Multicarrier Ds-cdma In Fmentioning

confidence: 99%

MMSE multiuser detection for array multicarrier DS-CDMA in fading channels

Sadler

Manikas

2005

IEEE Trans. Signal Process.

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Abstract-Reception of asynchronous, multicarrier direct-sequence-code division multiple access (DS-CDMA) in time-varying, multipath radio channels with use of a receiving antenna array is investigated. Interference reducing minimum mean squared error (MMSE) receivers are discussed, and by considering the time-variation of the channel, a modified structure is derived which is efficient for channels experiencing small-scale fading. A blind implementation of this receiver is then proposed. Subspace concepts are applied to formulate a tracking, composite channel vector estimator which operates effectively in fading situations, even when high levels of interference are present. Both the modified MMSE weight matrix and diversity combining weights are generated from these channel estimates. Simulations of the proposed receiver show it to have superior performance over a standard MMSE receiver which is periodically re-evaluated to permit it to follow the channel variations due to small-scale fading. Furthermore, a hybrid MMSE receiver is proposed which applies different processing methods depending on each transmitters mobility, resulting in improved performance.

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“…Hence, we are capable of achieving frequency diversity gain at the cost of a reduced spreading gain. Numerous Multiuser Detection (MUD) schemes have been proposed in the literature [8][9][10]. For example, the Minimum Mean Square Error (MMSE) MUD has been described in [3,8], while an Interference Cancellation (IC) based MUD has been proposed in [3,9].…”

Section: Introductionmentioning

confidence: 99%

Genetic algorithm assisted multiuser detection for asynchronous multicarrier CDMA

Hua

Hanzo

IEEE 60th Vehicular Technology Conference, 2004. VTC2004-Fall. 2004

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In this contribution a novel genetic algorithm (GA) based multiuser detection (MUD) aided multicarrier code-division multiple-access (MC CDMA) scheme was investigated in the context of frequency-selective Rayleigh fading channels. We considered four different detection strategies in our performance comparisons. Furthermore, turbo coding was invoked for the sake of performance enhancement and -surprisingly-for further complexity reduction. The simulation results showed that the GA assisted MUD was capable of significantly reducing the complexity of Verdu's optimum MUD without significantly degrading the achievable performance.

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MMSE detection of multicarrier CDMA

Cited by 79 publications

References 9 publications

Analysis of Asynchronous Long-Code Multicarrier CDMA Systems With Correlated Fading

Analysis of Asynchronous Long-Code Multicarrier CDMA Systems With Correlated Fading

MMSE multiuser detection for array multicarrier DS-CDMA in fading channels

Genetic algorithm assisted multiuser detection for asynchronous multicarrier CDMA

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