Embracing Asynchronism: Achieving Cooperative Diversity using Zigzag Interference Cancellation

Parastoo Sadeghi (ANU)

APPLIED SIGNAL PROCESSING SERIES

DATE: 2012-06-07
TIME: 11:00:00 - 12:00:00
LOCATION: RSISE Seminar Room, ground floor, building 115, cnr. North and Daley Roads, ANU
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ABSTRACT:
Synchronization between the received signals from several transmitters is a challenging problem for cooperative communications. In the literature it is often assumed that the signals are somehow perfectly synchronized, but the problem of communication with asynchronism needs further investigation. Moreover, in the few works where the problem is addressed, the proposed techniques are designed for a maximum delay whose value determines the decoding complexity. Thus in practice, only small delays can be dealt with. In this paper, instead of trying to avoid asynchronism between the received signals from two different transmitters, we propose to exploit it to provide cooperative diversity by optimally combining the two signals resulting from forward and backward zigzag interference cancellation. In addition to being tolerant to any delay, our bit error rate derivation shows that the proposed scheme provides diversity with a much lower complexity compared to a maximum likelihood (ML) decoder.
BIO:
Parastoo Sadeghi received the B.E. and M.E. degrees in electrical engineering from Sharif University of Technology, Tehran, Iran, in 1995 and 1997, respectively, and the Ph.D. degree in electrical engineering from The University of New South Wales, Sydney, Australia, in 2006. From 1997 to 2002, she worked as a Research Engineer and then as a Senior Research Engineer at Iran Communication Industries (ICI) in Tehran, Iran and at Deqx (formerly known as Clarity Eq) in Sydney, Australia. She joined the Australian National University in 2005, where she is currently a Fellow (Senior Lecturer) in the Research School of Engineering.