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MIMO-relay technology is accepted as a promising solution to improve cell edge performance for the future 4G wireless system. In this paper, an inter-cell interference mitigation scheme based on MIMO-relay technique is proposed to improve the average capacity for cell edge users. In the paper, a new network structure with shared relay station (SRS) is first studied, and a two-tier channel decomposition...
True integration and common operation and management of different packet based cellular radio networks will be a main characteristic of next generation (4G) mobile radio systems. These features will provide enhanced flexibility for both operators and end users to adapt to changing environments and demands. To reach this goal, however, an efficient usage of resources such as frequency, power, and space...
Hierarchical genetic algorithms (HGA) as a tool for a search and optimizing methodology has now reached a mature stage. The minimum resource facility to carry user traffic which is called a channel unit (CU) is composed of the IEEE 802.16 medium access control (MAC) protocol. The control of the number of CU depending on traffic load solves heterogeneous and asymmetrical traffic problem in 4G system...
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