QoS-Constrained Information-Theoretic Sum Capacity of Reverse Link CDMA Systems

Seong Jun Oh, Anthony C.K. Soong

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

The information-theoretic sum capacity of reverse link CDMA systems is investigated in this paper. As the reverse link CDMA systems are interference-limited, for given channel and noise conditions, the information-theoretic system capacity can be achieved by optimaly allocating the transmit powers of the mobile stations. The maximum capacity is often achieved by unfair resource allocation. To avoid such a case, QoS constraints are imposed to individual mobile stations. The exhaustive search of the optimal power allocation solution that maximizes the aggregate capacity, requires O(NM) computations, where M is the number of the mobile station in the system and N is the granularity of the transmit power of a mobile station. The paper shows that for a single cell, the optimal power allocation solution can be found by polynomial times of computations, without sacrificing the optimality. Numerical results are presented to show the multi-user diversity gain and the impact of QoS constraints.

Original languageEnglish
Pages190-194
Number of pages5
Publication statusPublished - 2003
Externally publishedYes
EventIEEE Global Telecommunications Conference GLOBECOM'03 - San Francisco, CA, United States
Duration: 2003 Dec 12003 Dec 5

Other

OtherIEEE Global Telecommunications Conference GLOBECOM'03
CountryUnited States
CitySan Francisco, CA
Period03/12/103/12/5

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Global and Planetary Change

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    Oh, S. J., & Soong, A. C. K. (2003). QoS-Constrained Information-Theoretic Sum Capacity of Reverse Link CDMA Systems. 190-194. Paper presented at IEEE Global Telecommunications Conference GLOBECOM'03, San Francisco, CA, United States.