User capacity analysis of space division multiple access channel

Zhi Quan Luo, Wai Yin Shum, Gongyun Zhao

Research output: Contribution to journalConference articlepeer-review

2 Scopus citations


Space Division Multiple Access (SDMA), which uses beamforming techniques to exploit the spatial diversity of different users, can significantly increase system capacity as well as the communication range between users and the basestation. In this paper, we consider the SDMA uplink channel, whereby a pool of users wish to communicate with a basestation with a fixed quality of service (QoS) requirement. We analyze the SDMA average user capacity defined as the average maximum number of random users that can be scheduled for simultaneous transmission, while meeting their respective QoS requirements. Using a standard probabilistic model involving narrow-band and far-field assumptions for the random users, we characterize the average user capacity in terms of the number of antennas, the QoS requirement, number of users and the maximum SNR (signal to noise ratio) among all users. These results act as a system design guide, offering insight into the tradeoff between hardware cost and system performance.

Original languageEnglish (US)
Pages (from-to)223-227
Number of pages5
JournalConference Record of the Asilomar Conference on Signals, Systems and Computers
StatePublished - 2003
EventConference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and Computers - Pacific Grove, CA, United States
Duration: Nov 9 2003Nov 12 2003


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