Title :
Factor graph based design of an OFDM-IDMA receiver performing joint data detection, channel estimation, and channel length selection
Author :
Novak, Clemens ; Matz, Gerald ; Hlawatsch, Franz
Author_Institution :
Inst. of Commun. & Radio-Freq. Eng., Vienna Univ. of Technol., Vienna
Abstract :
We present a factor graph based design of a receiver for pilot-assisted OFDM-IDMA systems transmitting over frequency-selective channels. The receiver performs joint iterative multiuser data detection and channel estimation with a complexity that is linear in the number of users, and it includes estimation of the channel length. Simulation results demonstrate large performance gains compared to OFDM-IDMA receivers using separate MMSE channel estimation.
Keywords :
OFDM modulation; channel estimation; graph theory; iterative methods; least mean squares methods; multi-access systems; OFDM-IDMA receiver; channel length selection; factor graph; frequency-selective channels; iterative multiuser data detection; separate MMSE channel estimation; Binary phase shift keying; Channel estimation; Data engineering; Design engineering; Discrete Fourier transforms; Frequency estimation; Performance gain; Radio frequency; Sum product algorithm; Transmitters; OFDM-IDMA; channel estimation; factor graph; iterative receiver; multiuser detection; sum-product algorithm;
Conference_Titel :
Acoustics, Speech and Signal Processing, 2009. ICASSP 2009. IEEE International Conference on
Conference_Location :
Taipei
Print_ISBN :
978-1-4244-2353-8
Electronic_ISBN :
1520-6149
DOI :
10.1109/ICASSP.2009.4960145
