A novel scheme for linear multiuser detection in asynchronous DS-CDMA systems with frequency selective fading

Uzmi, Zartash Afzal; Mujtaba, S.A.

doi:10.1109/glocom.1999.830232

Cited by 1 publication

(7 citation statements)

References 11 publications

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“…are the delays incurred by individual users in the flat 1 wireless channels with single tap gains ) (…”

Section: System Model and Sub-symbol Schemementioning

confidence: 99%

“…In the scheme presented in [1], the symbols for each user are broken into sub-symbols at the boundaries defined by the start and end of symbols from other users. This makes an asynchronous system look like a synchronous one with variable length symbols.…”

Section: System Model and Sub-symbol Schemementioning

confidence: 99%

“…The decision to perform decorrelation in a particular subsymbol is based on two thresholds defined in [1]. These two thresholds are central to the idea of sub-symbol diversity combining and are defined below:…”

Section: Number Of Sub-symbolsmentioning

confidence: 99%

“…In [1] it is assumed that user transmission is uncontrolled in the sense that the starting instants of symbols received at the base station are uniformly distributed over the whole symbol period. For a small number of users, the sub-symbol intervals are long enough to allow easy decorrelation.…”

Section: Number Of Sub-symbolsmentioning

confidence: 99%

“…More recently, techniques that consider sub-symbols for partial correlations have been proposed [1]. This paper focuses on fine tuning the sub-symbol technique and maximizing the number of simultaneous users for the combining algorithms presented in [11].…”

Section: Introductionmentioning

confidence: 99%

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Maximizing system capacity in a sub-symbol based DS-CDMA multiuser detector

Uzmi

Narasimha

Globecom '00 - IEEE. Global Telecommunications Conference. Conference Record (Cat. No.00CH37137)

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A sub-symbol based multiuser detector for DS-CDMA systems was proposed in [1]. This paper addresses the optimization of such detectors to maximize the system capacity. It is shown that the maximum number of simultaneous users supported in a DS-CDMA system using sub-symbol scheme can be increased by the proper selection of certain thresholds delineated in [1], and by imposing moderate synchronization requirements on the transmitters. It is also shown that, in a moderately synchronized environment, performing decorrelation with only one sub-symbol is enough for accommodating a fairly large number of users, if the system signal to noise ratio (SNR) is medium to high. It has been verified through simulations that the maximum number of simultaneous users depends on the degree of synchronism and is approximately given by the number of chips in the longest subsymbol.

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“…are the delays incurred by individual users in the flat 1 wireless channels with single tap gains ) (…”

Section: System Model and Sub-symbol Schemementioning

confidence: 99%

Section: System Model and Sub-symbol Schemementioning

confidence: 99%

Section: Number Of Sub-symbolsmentioning

confidence: 99%

Section: Number Of Sub-symbolsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%