Multiuser subcarrier and bit allocation along with adaptive cell selection for OFDM transmission

Yingjun Zhang, Khaled Letaief

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

A dynamic multiuser subcarrier-and-bit allocation algorithm with low computational complexity for wideband OFDM downlink transmission is proposed to exploit the multiuser diversity in this paper. Our objective is to maximize the overall spectral efficiency in terms of the number of bits per subcarrier while simultaneously satisfying the requirements on each user's data rate, Bit Error Rate (BER), and the total transmit power. Our results show that the proposed dynamic subcarrier-and-bit allocation algorithm offers about 6dB performance gain over OFDM using adaptive modulation with fixed subcarrier allocation. Since outage may occur when users happen to be located near the boundary of the cell, a novel adaptive cell selection scheme is proposed to further reduce the probability of outage. Our results show that the probability of outage can be reduced by one order of magnitude.

Original languageEnglish
Pages (from-to)861-865
Number of pages5
JournalIEEE International Conference on Communications
Volume2
Publication statusPublished - 2002
Externally publishedYes

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Outages
Orthogonal frequency division multiplexing
Adaptive modulation
Bit error rate
Computational complexity

ASJC Scopus subject areas

  • Media Technology

Cite this

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