Conference Proceeding

Iterative decoding and channel estimation of DS/CDMA over slow Rayleigh fading channels

Dept. of Electr. Eng., Maryland Univ., College Park, MD
10/1998; DOI:10.1109/PIMRC.1998.731401 ISBN: 0-7803-4872-9 In proceeding of: Personal, Indoor and Mobile Radio Communications, 1998. The Ninth IEEE International Symposium on, Volume: 3
Source: IEEE Xplore

ABSTRACT We investigate the application of joint decoding and channel
estimation for DS/CDMA transmission over slow Rayleigh fading channels.
Some known symbols are inserted in the encoded data stream to enhance
the channel estimation process. An iterative algorithm that uses the
decoding information, in addition to the information contained in the
known symbols, to improve the channel parameters estimate is proposed. A
is shown that the optimum scheme has a complexity which grows
exponentially with the channel estimation filter length. Hence, we
propose some alternative sub-optimum schemes with polynomial complexity.
The different techniques that provide a tradeoff between simplicity of
implementation and BER performance are compared

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Keywords

alternative sub-optimum schemes
 
BER performance
 
channel estimation filter length
 
channel estimation process
 
channel parameters estimate
 
channels
 
different techniques
 
DS/CDMA transmission
 
joint decoding
 
known symbols
 
optimum scheme
 
simplicity
 
slow Rayleigh
 
tradeoff
 

H.E. Gamal