Shared Relay-Based Cooperative Communication with MIMO Detection
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Date
2013-02
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Addis Ababa University
Abstract
The wireless channel places fundamental limitation on the performance of wireless
communication network. Fading, path loss and shadowing are some of the
impairments caused by the wireless channel, which result in significant performance
degradation. These wireless channel impairments can be compensated by
various ways such as by increasing transmit power or bandwidth.
Since these radio resources are scarce and expensive, future wireless systems
should focus on new technologies that provide high spectral efficiency, high network
coverage and improved link reliability. In this aspect, Multiple-Input Multiple-
Output (MIMO) wireless communication system; where multiple antennas are
equipped at the transceiver of the wireless link, has been considered as promising
technology to meet these requirements.
However, due to size, cost, and/or hardware limitations, a small handheld wireless
device may not be able to support multiple antennas. As a remedy to this
problem cooperative communication, where nodes cooperate to create multiple
antennas virtually, has been proposed recently. Although cooperative communication
provide high network coverage and improved link reliability, the available
relay resources are not fully exploited due to lack of optimal signal detection
scheme.
To this end, this thesis presents a MIMO detection based cooperative wireless
communication called multiple-access relay channel (MARC) and analyze the
performance in the form of bit error rate (BER). It allows the receiver to jointly
detect the source and relay transmissions, to provide better diversity gain. In
MARC, multiple sources (two in our case) transmit to a common destination
with the assistance of a single relay.
In this scenario, a network containing two sources, a common destination and a
relay is analyzed. Two cooperative communication schemes which include amplify
and forward and decode and forward employing different MIMO detection
techniques are investigated and results obtained from simulations with respect to
variable relay positioning are presented.
Keywords: Amplify-and-Forward, Bit-Error-Rate, MIMO Signal Detection, Cooperative
Communications, Decode-and-Forward, Performance Analysis, Signalto-
Noise-Ratio, Wireless Networks, Superposition Modulation.
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Keywords
Amplify-and-Forward; Bit-Error-Rate; MIMO Signal Detection; Cooperative Communications; Decode-and-Forward; Performance Analysis; Signalto- Noise-Ratio; Wireless Networks; Superposition Modulation