Sciweavers

Share
VTC
2006
IEEE

Iterative Equalization and Decoding for Unsynchronized OFDMA Uplink Transmissions

8 years 11 months ago
Iterative Equalization and Decoding for Unsynchronized OFDMA Uplink Transmissions
— For the uplink transmission of a coded OFDMA system, we present an iterative receiver that performs joint frequency offset acquisition, channel estimation and maximum a posteriori (MAP)-based decoding for each active user in this work. The proposed receiver attempts to separate users’ combined signals by resorting to the space-alternating generalized expectation-maximization (EM) algorithm. Each separated user’s signal is then passed to an expectation-conditional maximization (ECM)-based processor that jointly performs frequency acquisition, channel estimation and decoding at each iteration. As compared with conventional OFDMA systems that employ harddecision equalization and decoding, the proposed receiver can exploit the soft-decision feedback derived from the MAP decoder to provide more reliable synchronization, channel estimation and interference suppression. Simulations indicate that the proposed scheme provides accurate decoding for unsynchronized OFDMA uplink transmissio...
Man-On Pun, Michele Morelli, C. C. Jay Kuo
Added 12 Jun 2010
Updated 12 Jun 2010
Type Conference
Year 2006
Where VTC
Authors Man-On Pun, Michele Morelli, C. C. Jay Kuo
Comments (0)
books