Graduate School and Research Center in Digital Sciences

Asynchronous CDMA systems with random spreading – Part II : Design criteria

Cottatellucci, Laura;Müller, Ralf R.;Debbah, Merouane

"IEEE Transactions on Information Theory", Vol.56, N°4, March 22, 2010

                        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 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 suboptimumlinear 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.

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Title:Asynchronous CDMA systems with random spreading – Part II : Design criteria
Keywords:Asynchronous code-division multiple-access (CDMA), channel capacity, effective interference, minimum mean-square error (MMSE) detector, multistage detector, multiuser detection, random matrix theory, ranrandom spreading sequences
Department:Communication systems
Eurecom ref:2957
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Bibtex: @article{EURECOM+2957, doi = { }, year = {2010}, month = {03}, title = {{A}synchronous {CDMA} systems with random spreading ? {P}art {II} : {D}esign criteria}, author = {{C}ottatellucci, {L}aura and {M}{\"u}ller, {R}alf {R}. and {D}ebbah, {M}erouane }, journal = {"{IEEE} {T}ransactions on {I}nformation {T}heory", {V}ol.56, {N}°4, {M}arch 22, 2010}, url = {} }
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