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|Title: ||Cooperative strategies for Gaussian parallel relay networks|
|Other Titles: ||Gaosi bing xing zhong ji wang luo zhong de he zuo ji zhi yan jiu|
|Authors: ||Hu, Ping (胡萍)|
|Department: ||Department of Electronic Engineering|
|Degree: ||Master of Philosophy|
|Issue Date: ||2009|
|Publisher: ||City University of Hong Kong|
|Subjects: ||Wireless communication systems.|
Radio relay systems.
|Notes: ||CityU Call Number: TK5103.2 .H8 2009|
viii, 104 leaves 30 cm.
Thesis (M.Phil.)--City University of Hong Kong, 2009.
Includes bibliographical references (leaves 100-104)
|Abstract: ||In cooperative communication networks, one fundamental and important topic is to
understand the performance limits in such kind of networks. That leads to a growing
demand on the area of network information theory and especially the topic of relay
networks. The parallel relay network, in which two or more relays arrayed in parallel
to assist the source to transmit message to the destination, is one kind of important
relay network. Furthermore, multi-terminal and bidirectional extensions should be
considered if we want to model more general scenarios. Based on the above two
considerations, we developed two kinds of networks respectively. One is two-user
parallel relay network and the other is two-way two-relay network. To simplify the
aspects which we are not interested, we assume that there is no direct link between
the source and destination or between the relays, and that the channel state is ¯xed
and perfectly known at all nodes.
In the two-user parallel relay network, we assume there are two source nodes and
two relay nodes. The destination is assumed to be equipped with multiple antennas.
This models an uplink transmission to the base station in a mesh network. For
this model, an outer bound and coding strategies including hybrid schemes based on
amplify-forward (AF), decode-forward (DF) and compress-forward (CF) are derived.
For each strategy, the channel conditions under which the capacity can be achieved
are derived. Compared with the single user network, the CF approach turns out
to be more attractive in a multiuser setting. Apart from the analysis in median
signal-to-noise ratio (SNR) region, the performance of di®erent strategies under low
SNR regime and high SNR regime is also investigated.
The two-way two-relay network is a bidirectional parallel relay network, in which
two terminals want to exchange messages with the help of two parallel relays. In
our model, we assume each terminal has multiple antennas and each relay has a
single antenna. Likewise, an outer bound is given for comparison and several dif-
ferent cooperative strategies based on AF and DF are proposed. We evaluate the performance of these strategies under di®erent channel conditions. It is shown that
not only the basic strategies have their best performance in some scenarios, but also
the mixed strategies match well under certain circumstances. Some strategies can
achieve or approach the outer bound under certain conditions. Furthermore, the
high SNR and low SNR performance is studied.|
|Online Catalog Link: ||http://lib.cityu.edu.hk/record=b2374991|
|Appears in Collections:||EE - Master of Philosophy |
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