Research efforts investigating effective technologies to mitigate such effects have been going on for the past years, as wireless communications are experiencing rapid growth. In addition, cellular wireless communication systems have to cope with interference due to frequency reuse. Radio propagation environment and the mobility of users give rise to signal fading and spreading in time, space, and frequency andĮxpired battery life at the mobile device poses DC power constraints. Wireless communication systems, as opposed to their wireline counterparts, pose some unique challenge:Īllocated spectrum limitation results in a limited levels of system capacity This trend is observed for third-generation systems, and it will most certainly continue for fourth- and fifth-generation systems. This is due to both an increased number of users and introduction of new high bit rate data services. Because of them, it is widely foreseen that in the future an enormous rise in traffic will be experienced for mobile and personal communications systems. In recent years, a substantial increase in the development of broadband wireless access technologies for evolving wireless Internet services and improved cellular systems has been observed.
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