CAPACITY BOUNDS ANALYSIS OF SWITCHED BEAM SMART ANTENNAS UNDER CDMA (original) (raw)
In CDMA concept, interference from other users within the same cell and from neighboring cells limits the maximum admissible connections below which the required quality of service requirements are met. In determining cell capacity a certain level of interference from other cells is usually tolerated for the omnidirectional antenna at the base station and thus the ratio of the total interference from other cells to interference generated within the same cell is an important design parameter. The adoption of smart antennas at the base station allows for increased tolerance to interference levels from within the cell and from neighboring cells and therefore permitting higher capacities. Interference capacity bounds represent a critical issue for power allocation, resource management and other schemes. In this paper, an effective interference ratio that depends on the omnidirectional ratio and antenna parameters is defined and used to analyze and quantify the interference levels and capacity bounds on the uplink for a single service under CDMA when utilizing a switched beam smart antenna. Capacity gains over the omnidirectional antenna are derived and presented graphically and their relationship to the allowable interference levels is discussed.
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