[CPCC] SEMINAR: Interference Cancellation in Relay Networks May 3 Mon 10 AM

Ender Ayanoglu ayanoglu at uci.edu
Mon Apr 26 16:29:38 PDT 2010


                             CPCC SEMINAR

  Interference Cancellation in a Linear Multi-Access Relay Network

                         May 3, 2010, Monday
                                10 AM
                       Engineering Gateway 3161


                               ABSTRACT

In this talk, we present transmission and detection schemes in
multi-access relay (MARN) network with linear constraints. In a (J, R,
N) MARN, J single-antenna user nodes send independent messages to one
N-antenna destination node by two hops of transmission through one
R-antenna relay node. For complexity considerations, the network is
studied under two linear constraints. For one, the relay generates
forwarded signals by linearly transforming its received signals. For
the other, the receiver decodes multi-user symbols with linear
complexity in the number of users. To obtain high communication
reliability and linear multi-user decoding, distributed space-time
codes (DSTCs) and zero-forcing interference cancellation (IC) are
applied to this multi-user relay network. Different from conventional
protocols that assign multi-users to orthogonal channels, our proposed
two protocols allow multi-user concurrent transmission in both or part
of the two hops to enhance spectrum efficiency. The first proposed
protocol is called DSTC-ICRec, which allows concurrent transmission in
both the source-relay link and the relay-receiver link. Analysis shows
that the diversity gain of DSTC-ICRec can be upperbounded as d \le R -
J + 1. This relation shows the tradeoff between the number of users
and the diversity by DSTC-ICRec. To gain higher diversity, another
protocol called TDMA-ICRec is proposed in which users time-share the
source-relay link. Multi-user concurrent transmission is used in the
relay-receiver link. It is shown through both analysis and simulation
that when N \ge 2J - 1, TDMA-ICRec achieves the maximum
interference-free (int-free) diversity of R, but with a loss of
symbol-rate compared to DSTC-ICRec. The proposed two protocols
tradeoff among diversity, symbol rate, and the number of users under
linear network constraints.


                         SPEAKER'S BIOGRAPHY

Liangbin Li received his B.S. and M.S. degrees in Electrical Engineering
from Fudan University, Shanghai, China in 2005 and 2008, respectively.
He is currently working toward the Ph.D. degree at the University of
California, Irvine. His research interests include communication
theory and multi-user wireless networks.


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