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In a radio environment, the greater the distance between the sender and the receiver, the greater the probability of interference. The distance between sender and receiver makes up the effective cell size in a cellular mobile network. Applying EDGE with 8-PSK-modulation to such a network implies shrinking the effective cell size. This is due to the fact that 8-PSK is more vulnerable to interference which in turn increases with distance. As illustrated in the figure below, the price of the impressive transmission rate of EDGE is a smaller cell radius. In an existing mobile network, this will limit the feasibility of the implementation of EDGE to urban environments with their high concentration of users and base stations.
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