Minimum mean-squared error multiuser decision-feedback detectors for DS-CDMA

Woodward, Graeme; Ratasuk, Rapeepat; Honig, Michael L.; Rapajic, P.B.

doi:10.1109/tcomm.2002.806550

Cited by 68 publications

(108 citation statements)

References 20 publications

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“…different cancellation orders and turns out to be too complex for practical use. The new receiver structure, denoted successive parallel arbitrated DF (SPA-DF) detection, is then combined with iterative cascaded DF stages [14], [15] to further reÞne the symbol estimates. The motivation for the novel DF structures is to mitigate the effects of error propagation often found in P-DF structures [14], [15], that are of great interest for uplink scenarios due to its capability of providing uniform performance over the users.…”

Section: Successive Parallel Arbitrated Df and Iterative Detectionmentioning

confidence: 99%

“…In [14], Woodward et al presented an iterative detector with an S-DF in the Þrst stage and P-DF or S-DF structures, with users being demodulated in reverse order, in the second stage. The work of [14] was then extended to account for coded systems and training-based reduced-rank Þlters [15].…”

Section: B Iterative Successive Parallel Arbitrated Df Detectionmentioning

confidence: 99%

“…The work of [14] was then extended to account for coded systems and training-based reduced-rank Þlters [15]. Here, we focus on the proposed SPA-DF receiver and the low complexity near-optimal ordering algorithm, and combine the SPA-DF structure with iterative detection.…”

Section: B Iterative Successive Parallel Arbitrated Df Detectionmentioning

confidence: 99%

“…The motivation for the proposed encoded structure is that signiÞcant gains can be obtained from iterative techniques with soft cancellation methods and error control coding [17]- [23] and from efÞcient receivers structures and ordering algorithms such as the novel SPA-DF detector. The decoding process of the existing S-DF, P-DF and iterative schemes, namely the ISS-DF and the ISP-DF, are explained in [14]. The decoding of the proposed iterative detection schemes that employ the SPA-DF detector (ISPAS-DF, ISPAP-DF and ISPASPA-DF) resembles the uncoded case, where the second stage beneÞts from the enhanced estimates provided by the Þrst stage that now employs convolutional codes followed by a Viterbi decoder with branch metrics based on the Hamming distance.…”

Section: A Convolutional Codes With Viterbi Decodingmentioning

confidence: 99%

“…The problem with the optimal ordering algorithms in [11], [12] is that they represent a very high computational burden for practical receiver design. Conversely, the DF receiver with parallel interference cancellation (P-DF) [13], [14], [15] satisÞes the uplink requirements, namely, cancellation of intracell interference and suppression of the remaining other-cell interference, and provides, in general, uniform performance over the user population even though it is more sensitive to error propagation. The multistage or iterative DF schemes presented in [14], [15] are based on the combination of S-DF and P-DF schemes in multiple stages in order to reÞne the symbol estimates, resulting in improved performance over conventional S-DF, P-DF and mitigation of error propagation.…”

mentioning

confidence: 99%

See 4 more Smart Citations

Minimum Mean Squared Error Iterative Successive Parallel Arbitrated Decision Feedback Detectors for DS-CDMA Systems

Lamare

Sampaio‐Neto

2006

2006 IEEE Ninth International Symposium on Spread Spectrum Techniques and Applications

116

162

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ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. Abstract-In this paper we propose minimum mean squared error (MMSE) iterative successive parallel arbitrated decision feedback (DF) receivers for direct sequence code division multiple access (DS-CDMA) systems. We describe the MMSE design criterion for DF multiuser detectors along with successive, parallel and iterative interference cancellation structures. A novel efÞcient DF structure that employs successive cancellation with parallel arbitrated branches and a near-optimal low complexity user ordering algorithm are presented. The proposed DF receiver structure and the ordering algorithm are then combined with iterative cascaded DF stages for mitigating the deleterious effects of error propagation for convolutionally encoded systems with both Viterbi and turbo decoding as well as for uncoded schemes. We mathematically study the relations between the MMSE achieved by the analyzed DF structures, including the novel scheme, with imperfect and perfect feedback. Simulation results for an uplink scenario assess the new iterative DF detectors against linear receivers and evaluate the effects of error propagation of the new cancellation methods against existing ones.Index Terms-DS-CDMA systems, multiuser detection, decision feedback structures, iterative detection, iterative decoding.

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