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

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3 Author(s)
Novak, C. ; Inst. of Commun. & Radio-Freq. Eng., Vienna Univ., Vienna ; Matz, G. ; Hlawatsch, F.

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.

Published in:

Acoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on

Date of Conference:

March 31 2008-April 4 2008