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 publicationIEEE Wireless Communications and Networking Conference, WCNC
DOIs
Publication statusPublished - 2009 Sep 22
Event2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary
Duration: 2009 Apr 52009 Apr 8

Other

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

Fingerprint

Power spectral density
Code division multiple access
Throughput
Channel coding
Convex optimization
Power control
Communication

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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

Optimal rate and power allocation in uplink packet CDMA transmission. / Kim, Byoung Hoon; Oh, Seong-Jun.

IEEE Wireless Communications and Networking Conference, WCNC. 2009. 4917867.

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

Kim, BH & Oh, S-J 2009, Optimal rate and power allocation in uplink packet CDMA transmission. in IEEE Wireless Communications and Networking Conference, WCNC., 4917867, 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009, Budapest, Hungary, 09/4/5. https://doi.org/10.1109/WCNC.2009.4917867
Kim BH, Oh S-J. Optimal rate and power allocation in uplink packet CDMA transmission. In IEEE Wireless Communications and Networking Conference, WCNC. 2009. 4917867 https://doi.org/10.1109/WCNC.2009.4917867
Kim, Byoung Hoon ; Oh, Seong-Jun. / Optimal rate and power allocation in uplink packet CDMA transmission. IEEE Wireless Communications and Networking Conference, WCNC. 2009.
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