Adaptive Detector for SC-FDE in Multiuser DS-UWB Systems Based on Structured Channel Estimation with Conjugate Gradient Algorithm

Li, Sheng; Lamare, Rodrigo C. de

doi:10.1109/vetecs.2010.5493876

Cited by 2 publications

(4 citation statements)

References 25 publications

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“…In the following simulations, we consider that all the algorithms are used in synchronous DS-CDMA systems employing BPSK modulation and we transmit 10000 information symbols per user in one packet and the results are averaged over independent Monte Carlo runs. The spreading signature used for every user is randomly generated and the sequence length is 16. We assume that all the users have the same power unless otherwise stated.…”

Section: Simulation Resultsmentioning

confidence: 99%

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Multiple-Candidate Successive Interference Cancellation with Widely-Linear Processing for MAI and Jamming Suppression in DS-CDMA Systems

Yang,

de Lamare

2014

Preprint

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In this paper, we propose a widely-linear (WL) receiver structure for multiple access interference (MAI) and jamming signal (JS) suppression in direct-sequence code-division multiple-access (DS-CDMA) systems. A vector space projection (VSP) scheme is also considered to cancel the JS before detecting the desired signals. We develop a novel multiple-candidate successive interference cancellation (MC-SIC) scheme which processes two consecutive user symbols at one time to process the unreliable estimates and a number of selected points serve as the feedback candidates for interference cancellation, which is effective for alleviating the effect of error propagation in the SIC algorithm. Widely-linear signal processing is then used to enhance the performance of the receiver in non-circular modulation scheme. By bringing together the techniques mentioned above, a novel interference suppression scheme is proposed which combines the widely-linear multiple-candidate SIC (WL-MC-SIC) minimum mean-squared error (MMSE) algorithm with the VSP scheme to suppress MAI and JS simultaneously. Simulations for binary phase shift keying (BPSK) modulation scenarios show that the proposed structure achieves a better MAI suppression performance compared with previously reported SIC MMSE receivers at lower complexity and a superior JS suppression performance.

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Section: Simulation Resultsmentioning

confidence: 99%

“…In wireless communication systems, most interference suppression or parameter estimation techniques are based on linear signal processing [15], [16]. However, when a noncircular modulation is applied, e.g.…”

Section: Introductionmentioning

confidence: 99%

Multiple-Candidate Successive Interference Cancellation with Widely-Linear Processing for MAI and Jamming Suppression in DS-CDMA Systems

Yang,

de Lamare

2014

Preprint

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“…The concept of SCE was proposed in [20], where the SCE shows a better performance than the UCE. In [21], adaptive MMSE detection schemes for SC-FDE in multiuser DS-UWB systems based on SCE are developed, where the estimated h equ is adaptively calculated based on RLS, least-mean squares (LMS) and the conjugate gradient (CG) algorithm for the detection and the RLS version performs the best. The purpose of developing biased estimation in this scenario is to further improve the performance of the RLS algorithm in terms of the MSE.…”

Section: B System Model For the Sce: Parameter Estimation Scenariomentioning

confidence: 99%

“…The LS solution of the receiver can be computed recursively by the RLS adaptive algorithm. We employ the RLS update equation that is proposed in [21]…”

Section: Ls Solution and Adaptive Rls Algorithm For The Interference ...mentioning

confidence: 99%

Adaptive Frequency-Domain Group-Based Shrinkage Estimators for UWB Systems

Lamare

Haardt

2013

IEEE Trans. Veh. Technol.

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Abstract-In this work, we propose low-complexity adaptive biased estimation algorithms, called group-based shrinkage estimators (GSEs), for parameter estimation and interference suppression scenarios with mechanisms to automatically adjust the shrinkage factors. The proposed estimation algorithms divide the target parameter vector into a number of groups and adaptively calculate one shrinkage factor for each group. GSE schemes improve the performance of the conventional least squares (LS) estimator in terms of the mean-squared error (MSE), while requiring a very modest increase in complexity. An MSE analysis is presented which indicates the lower bounds of the GSE schemes with different group sizes. We prove that our proposed schemes outperform the biased estimation with only one shrinkage factor and the best performance of GSE can be obtained with the maximum number of groups. Then, we consider an application of the proposed algorithms to single-carrier frequency-domain equalization (SC-FDE) of direct-sequence ultra-wideband (DS-UWB) systems, in which the structured channel estimation (SCE) algorithm and the frequency domain receiver employ the GSE. The simulation results show that the proposed algorithms significantly outperform the conventional unbiased estimator in the analyzed scenarios.

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Adaptive Detector for SC-FDE in Multiuser DS-UWB Systems Based on Structured Channel Estimation with Conjugate Gradient Algorithm

Cited by 2 publications

References 25 publications

Multiple-Candidate Successive Interference Cancellation with Widely-Linear Processing for MAI and Jamming Suppression in DS-CDMA Systems

Multiple-Candidate Successive Interference Cancellation with Widely-Linear Processing for MAI and Jamming Suppression in DS-CDMA Systems

Adaptive Frequency-Domain Group-Based Shrinkage Estimators for UWB Systems

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