Optimal rate and power allocation in uplink packet CDMA transmission

Byoung Hoon Kim, Seong Jun Oh

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

This paper revisits an optimal rate and power allocation problem to maximize throughput in uplink CDMA singlecell packet data communications. First, we show that the widelyaccepted belief that an optimally selected rate always keeps a constant value of the resulting bit energy to the interference plus noise power spectral density ratio is not true in most practical CDMA packet transmission environments, where the packet size varies in proportion to the rate. Then, we derive the rate-dependent optimal bit energy-to-interference- noise power spectral density ratio, based on which we convert the original joint optimization problem of rate and power to an equivalent but simple power allocation problem. Finally, we derive an optimal power allocation strategy by applying the convex optimization theory. Through two instructive examples, we show that the optimality of the well-known bang bang power control, that is, each user (except at most one user) should either transmit his data at the maximum allowed power level or at the minimum required power level meeting the SINR requirement in order to maximize the system throughput, may or may not be true depending on the incorporated channel coding scheme.

Original languageEnglish
Title of host publication2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings
DOIs
Publication statusPublished - 2009
Event2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary
Duration: 2009 Apr 52009 Apr 8

Publication series

NameIEEE Wireless Communications and Networking Conference, WCNC
ISSN (Print)1525-3511

Other

Other2009 IEEE Wireless Communications and Networking Conference, WCNC 2009
CountryHungary
CityBudapest
Period09/4/509/4/8

ASJC Scopus subject areas

  • Engineering(all)

Fingerprint Dive into the research topics of 'Optimal rate and power allocation in uplink packet CDMA transmission'. Together they form a unique fingerprint.

  • Cite this

    Kim, B. H., & Oh, S. J. (2009). Optimal rate and power allocation in uplink packet CDMA transmission. In 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Proceedings [4917867] (IEEE Wireless Communications and Networking Conference, WCNC). https://doi.org/10.1109/WCNC.2009.4917867