Turbo Estimation and Equalization for Asynchronous Uplink MC-CDMA

Author

Guenach, M. ; Marey, M. ; Wymeersch, H. ; Steendam, H. ; Moeneclaey, M.

Author_Institution

Alcatel-Lucent, Paris

Volume

7

Issue

4

fYear

2008

fDate

4/1/2008 12:00:00 AM

Firstpage

1217

Lastpage

1226

Abstract

In this contribution, we propose a new code-aided synchronization and channel estimation algorithm for uplink MC-CDMA. The space alternating generalized expectation- maximization (SAGE) algorithm is used to estimate the channel impulse responses, propagation delays and carrier frequency offsets of the different users. The estimator, multi-user detector, equalizer, demapper and channel decoder exchange soft information in an iterative way. The performance of the proposed algorithm is evaluated through Monte Carlo simulations. Impressive performance gains are visible as compared to a conventional data-aided estimation scheme.

Keywords

Monte Carlo methods; channel estimation; code division multiple access; equalisers; expectation-maximisation algorithm; synchronisation; turbo codes; Monte Carlo simulations; SAGE algorithm; asynchronous uplink MC-CDMA; carrier frequency offsets; channel estimation algorithm; channel impulse response; code-aided synchronization; equalization; multi-carrier code division multiple access; propagation delays; space alternating generalized expectation- maximization algorithm; turbo estimation; Channel estimation; Delay estimation; Detectors; Equalizers; Frequency estimation; Frequency synchronization; Iterative algorithms; Iterative decoding; Multicarrier code division multiple access; Propagation delay;

fLanguage

English

Journal_Title

Wireless Communications, IEEE Transactions on

Publisher

ieee

ISSN

1536-1276

Type

jour

DOI

10.1109/TWC.2008.060648

Filename

4489749