Blind chip-rate multiuser equalisation

Weiss, Stephan; Hadef, Mahmoud

doi:10.1049/ic.2003.0305

Cited by 1 publication

(2 citation statements)

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“…Blind schemes have been performed using a constant modulus (CM) criterion [7,8,9], whereby the derived algorithms either neglect the dispersiveness of the channel [7,9] or spreading [8,10], whereby the later additionally require mutual decorrelation of the recovered user sequences. In [11], a blind scheme similar to [8,10] has been developed, whereby the despreading in the DS-CDMA receiver ensures the orthogonality of the recovered sequences, and a CM criterion on all users suffices. The algorithm in [11] is however only suitable for a fully loaded system, in which all possible users are active.…”

Section: Introductionmentioning

confidence: 99%

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A blind synchronous multi-user DS-CDMA equaliser with partial loading

Hadef

Weiss

2004

First International Symposium on Control, Communications and Signal Processing, 2004.

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In this paper, we propose a blind multiuser detection scheme in a direct sequence CDMA downlink scenario by means of a chiplevel equaliser, which can be updated even if not all possible users are active, i.e. the system is partially loaded. The active synchronous users are separated by re-establishing orthogonality of their spreading sequences in a common chip-level equaliser. The adaptation algorithm is mainly based on a constant modulus (CM) criterion applied to the active users. The inactive codes in the system must be considered, for which we proposed and compare three different methods: (i) a mean square error criterion for absent users, and a CM approach with (ii) zero modulus or (iii) the transmission of arbitrary signals with small code amplitude. For all three cases, stochastic gradient descent algorithms are derived. The proposed algorithms are analysed and compared through various simulations, which demonstrate the algorithms' convergence and BER performance.

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Section: Introductionmentioning

confidence: 99%

“…In [11], a blind scheme similar to [8,10] has been developed, whereby the despreading in the DS-CDMA receiver ensures the orthogonality of the recovered sequences, and a CM criterion on all users suffices. The algorithm in [11] is however only suitable for a fully loaded system, in which all possible users are active.…”

Section: Introductionmentioning

confidence: 99%