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5 8

p ro j e ct 1 6

Motivated by the increasing demand for

higher data rate, broader coverage, and lower

infrastructure cost in wireless systems, a major

effort is being made to study the use of relay

stations in wireless networks. Base stations

require considerable infrastructure cost

whereas relays require very low-cost, operate

at low power, and have no connection to

wired infrastructure. Thus, the use of multi-hop

relaying can provide considerable performance

improvement to a wireless network through

coverage enhancement, range extension and

capacity enhancement, at relatively low cost

to the service provider. Studies have shown

that that use of relaying technology is a reliable

way to improve the performance through

Effect of Interference in Relay-Assisted Cellular Networks

Valentine A. Aalo, PI


Student: Constatntine Mukasa

cooperative diversity and extend the coverage

of many wireless communication systems. The

performance of a multi-hop relaying system

with amplify-and-forward (AF) transmission

in which the transmitted signal propagates

through cascaded nodes, with each node

amplifying and forwarding the received signal

from the previous node to the next node, is

sometimes of interest. Figure 1 shows a relay-

assisted cellular network. However, in practice

impairments such as co-channel interference

(see figure 2) is inevitable due to aggressive

frequency reuse employed in cellular networks

to obtain high spectral utilization.

The effect of interference on the performance

of multi-hop relay networks has not been

studied extensively in the literature. In this

work, we develop an analytical tool to study

the performance of a multi-hop transmission

Figure 1: Relay-assisted cellular network