A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission

Cheong Yui Wong, C. Y. Tsui, Roger S. Cheng, Khaled Letaief

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

192 Citations (Scopus)

Abstract

In this paper, we propose sub-carrier allocation algorithms for a multiple access scheme in downlink OFDM transmission. Knowing the channel characteristics of all the users at the base station, the sub-carrier allocation algorithm assigns sub-carriers to the users in a way that the total transmit power is minimized. An optimal algorithm is presented to provide the hest sub-carrier assignment. The complexity of the optimal solution renders it impractical for real-time application. To deal with the frequently changing channel characteristic of a fast time-varying multipath fading channel, a heuristic algorithm based on constructive assignment and iterative improvement is proposed which can give out a valid solution In real time. Experimental results show that the performance of this real-time algorithm is close to that of the optimal allocation.

Original languageEnglish
Title of host publicationVTC 1999-Fall: IEEE VTS 50th Vehicular Technology Conference
Pages1124-1128
Number of pages5
Volume50
Edition2
DOIs
Publication statusPublished - 1999
Externally publishedYes
EventIEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall - Amsterdam, Netherlands
Duration: 19 Sep 199922 Sep 1999

Other

OtherIEEE VTS 50th Vehicular Technology Conference, VTC 1999-Fall
CountryNetherlands
CityAmsterdam
Period19/9/9922/9/99

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ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

Wong, C. Y., Tsui, C. Y., Cheng, R. S., & Letaief, K. (1999). A real-time sub-carrier allocation scheme for multiple access downlink OFDM transmission. In VTC 1999-Fall: IEEE VTS 50th Vehicular Technology Conference (2 ed., Vol. 50, pp. 1124-1128). [798611] https://doi.org/10.1109/VETECF.1999.798611