Asynchronous CDMA Systems with Random Spreading–Part II: Design Criteria - CentraleSupélec Access content directly
Journal Articles IEEE Transactions on Information Theory Year : 2010

Asynchronous CDMA Systems with Random Spreading–Part II: Design Criteria

Abstract

Totally asynchronous code-division multiple-access (CDMA) systems are addressed. In Part I, the fundamental limits of asynchronous CDMA systems are analyzed in terms of spectral efficiency and SINR at the output of the optimum linear detector. The focus of Part II is the design of low-complexity implementations of linear multiuser detectors in systems with many users. We consider detectors that admit a multistage representation, e.g. reduced rank multistage Wiener filters, polynomial expansion detectors, weighted linear parallel interference cancellers. The effects of excess bandwidth, chip-pulse shaping, and time delay distribution on CDMA with suboptimum lin- ear receiver structures are investigated. Recursive expressions for universal weight design are given. The performance in terms of SINR is derived in the large-system limit and the performance improvement over synchronous systems is quantified. The considerations distinguish between two ways of forming discrete-time statistics: chip-matched filtering and oversampling.
Fichier principal
Vignette du fichier
J1002.pdf (404.54 Ko) Télécharger le fichier
Origin : Files produced by the author(s)
Loading...

Dates and versions

hal-00556129 , version 1 (15-01-2011)

Identifiers

Cite

Laura Cottatellucci, Ralph Müller, Merouane Debbah. Asynchronous CDMA Systems with Random Spreading–Part II: Design Criteria. IEEE Transactions on Information Theory, 2010, 56 (4), pp.1498-1520. ⟨10.1109/TIT.2010.2040898⟩. ⟨hal-00556129⟩
216 View
128 Download

Altmetric

Share

Gmail Facebook X LinkedIn More