DocumentCode
990562
Title
Log likelihood ratio calculation without SNR estimation for forward link DS-CDMA receivers
Author
Lee, Jungwoo
Author_Institution
Sch. of Electr. Eng., Seoul Nat. Univ., South Korea
Volume
11
Issue
6
fYear
2004
fDate
6/1/2004 12:00:00 AM
Firstpage
565
Lastpage
568
Abstract
This letter deals with the log likelihood ratio computation for the turbo decoder operating on the forward link of a CDMA system. It is shown that the log likelihood ratio contains a time-varying factor, which is the power ratio between the data and the pilot channels. Two alternative techniques for estimating the power ratio are compared along with an ideal scheme.
Keywords
code division multiple access; maximum likelihood estimation; spread spectrum communication; turbo codes; MAP; forward link DS-CDMA receivers; log likelihood ratio calculation; pilot channels; power ratio; time-varying factor; turbo decoder; turbo scaling; 3G mobile communication; Amplitude estimation; Analysis of variance; Base stations; Decoding; Fading; Mathematical model; Multiaccess communication; Multipath channels; Standards development; DS-CDMA; log likelihood ratio; turbo decoding; turbo scaling;
fLanguage
English
Journal_Title
Signal Processing Letters, IEEE
Publisher
ieee
ISSN
1070-9908
Type
jour
DOI
10.1109/LSP.2004.826665
Filename
1300610
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