A factor graph approach to joint iterative data detection and channel estimation in pilot-assisted IDMA transmissions

We consider a pilot-assisted interleave-division multiple access (IDMA) system transmitting over block-fading channels. We describe this system in terms of a factor graph and use the sum-product algorithm to develop a receiver that performs joint data detection and channel estimation. Suitable appro...

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Bibliographic Details
Main Authors: Novak, C., Matz, G., Hlawatsch, F.
Format: Conference Proceeding
Language:English
Subjects:
Binary phase shift keying
Channel coding
Channel estimation
factor graphs
IDMA
Iterative algorithms
Iterative methods
iterative receivers
multiuser detection
Niobium
Performance gain
Radio frequency
Sum product algorithm
Transmitters
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Summary:We consider a pilot-assisted interleave-division multiple access (IDMA) system transmitting over block-fading channels. We describe this system in terms of a factor graph and use the sum-product algorithm to develop a receiver that performs joint data detection and channel estimation. Suitable approximations to the messages passed by the sum-product algorithm yield an implementation with a complexity that scales linearly with the number of users. Simulation results demonstrate large performance gains compared to classical receivers performing separate channel estimation and data detection.
ISSN:1520-6149
2379-190X
DOI:10.1109/ICASSP.2008.4518205