Theoretical model to determine the blocking probability for SDMA systems

• Published in: IEEE transactions on vehicular technology Vol. 50; no. 5; pp. 1279 - 1288
• Main Authors: Galvan-Tejada, G.M., Gardiner, J.G.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01.09.2001; Institute of Electrical and Electronics Engineers; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Adaptive arrays; Antenna arrays; Applied sciences; Capacity planning; Equations; Exact sciences and technology; Frequency conversion; Information, signal and communications theory; Interference; Linear systems; Mathematical analysis; Mathematical models; Multiaccess communication; Multiple access; Multiplexing; Signal and communications theory; Signal reception; Space technology; Systems, networks and services of telecommunications; Telecommunications; Telecommunications and information theory; Teletraffic; Time division multiple access; Traffic engineering; Traffic flow; Space division multiple access; Wireless telecommunication; Resource allocation; Blocking; Teletraffic; Mathematical model; Antenna array
• ISSN: 0018-9545; 1939-9359
• DOI: 10.1109/25.950329

Antenna array technology has attracted the attention of the research community as a means to increase system capacity and improve the signal reception. Space division multiple access (SDMA) is a multi-access scheme based on the use of antenna arrays to separate users by exploiting their positions in space. Several works have been carried out to examine the improvement in the system capacity provided by SDMA. A theoretical model to determine the blocking probability for SDMA is derived. A closed-form linear system of equations is obtained whose numerical solution gives the blocking probability. The formulation is employed to assess the capacity gain improvement of a single-cell system under specific conditions. It is found from the results that SDMA is not efficient for low traffic loads, whereas it is so for high traffic.