Opportunistic scheduling in decentralized OFDM systems

Yahya S. Al-Harthi; Ahmed H. Tewfik; Mohamed Slim Alouini

doi:10.1109/VTCF.2006.270

Opportunistic scheduling in decentralized OFDM systems

Yahya S. Al-Harthi^*, Ahmed H. Tewfik, Mohamed Slim Alouini

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Orthogonal frequency division multiplexing (OFDM) is emerging as a key modulation scheme for future high speed packets based wireless transmission systems. In a wireless multiuser network system, when an opportunistic scheduling is employed in the OFDM system with adaptive modulation, it may encounter implementation problems due to the need for a large amount of channel information. In this paper we propose a decentralized scheduling scheme to exploit multiuser diversity (MUDiv) in OFDM systems. Users access the channel using a simple variation of the ALOHA random access protocol, termed channel-aware/collision-limited ALOHA. Based on the channel quality, users randomly transmit a request packet with a probability p. When a collision occurs, collided users will retransmit a request packet with probability p. We present an analytical analysis of the average system throughput (average spectral efficiency). We compare our proposed scheduling scheme with the proposed scheduling scheme in [1], the optimal selective diversity scheduling scheme (centralized scheduling), and the round-robin scheduling scheme.

Original language	English (US)
Title of host publication	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Pages	1289-1294
Number of pages	6
DOIs	https://doi.org/10.1109/VTCF.2006.270
State	Published - 2006
Externally published	Yes
Event	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall - Montreal, QC, Canada Duration: Sep 25 2006 → Sep 28 2006

Other

Other	2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Country/Territory	Canada
City	Montreal, QC
Period	09/25/06 → 09/28/06

ASJC Scopus subject areas

Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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10.1109/VTCF.2006.270

Cite this

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title = "Opportunistic scheduling in decentralized OFDM systems",

abstract = "Orthogonal frequency division multiplexing (OFDM) is emerging as a key modulation scheme for future high speed packets based wireless transmission systems. In a wireless multiuser network system, when an opportunistic scheduling is employed in the OFDM system with adaptive modulation, it may encounter implementation problems due to the need for a large amount of channel information. In this paper we propose a decentralized scheduling scheme to exploit multiuser diversity (MUDiv) in OFDM systems. Users access the channel using a simple variation of the ALOHA random access protocol, termed channel-aware/collision-limited ALOHA. Based on the channel quality, users randomly transmit a request packet with a probability p. When a collision occurs, collided users will retransmit a request packet with probability p. We present an analytical analysis of the average system throughput (average spectral efficiency). We compare our proposed scheduling scheme with the proposed scheduling scheme in [1], the optimal selective diversity scheduling scheme (centralized scheduling), and the round-robin scheduling scheme.",

author = "Al-Harthi, {Yahya S.} and Tewfik, {Ahmed H.} and Alouini, {Mohamed Slim}",

year = "2006",

doi = "10.1109/VTCF.2006.270",

language = "English (US)",

isbn = "1424400635",

pages = "1289--1294",

booktitle = "2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall",

note = "2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall ; Conference date: 25-09-2006 Through 28-09-2006",

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AU - Al-Harthi, Yahya S.

AU - Tewfik, Ahmed H.

AU - Alouini, Mohamed Slim

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N2 - Orthogonal frequency division multiplexing (OFDM) is emerging as a key modulation scheme for future high speed packets based wireless transmission systems. In a wireless multiuser network system, when an opportunistic scheduling is employed in the OFDM system with adaptive modulation, it may encounter implementation problems due to the need for a large amount of channel information. In this paper we propose a decentralized scheduling scheme to exploit multiuser diversity (MUDiv) in OFDM systems. Users access the channel using a simple variation of the ALOHA random access protocol, termed channel-aware/collision-limited ALOHA. Based on the channel quality, users randomly transmit a request packet with a probability p. When a collision occurs, collided users will retransmit a request packet with probability p. We present an analytical analysis of the average system throughput (average spectral efficiency). We compare our proposed scheduling scheme with the proposed scheduling scheme in [1], the optimal selective diversity scheduling scheme (centralized scheduling), and the round-robin scheduling scheme.

AB - Orthogonal frequency division multiplexing (OFDM) is emerging as a key modulation scheme for future high speed packets based wireless transmission systems. In a wireless multiuser network system, when an opportunistic scheduling is employed in the OFDM system with adaptive modulation, it may encounter implementation problems due to the need for a large amount of channel information. In this paper we propose a decentralized scheduling scheme to exploit multiuser diversity (MUDiv) in OFDM systems. Users access the channel using a simple variation of the ALOHA random access protocol, termed channel-aware/collision-limited ALOHA. Based on the channel quality, users randomly transmit a request packet with a probability p. When a collision occurs, collided users will retransmit a request packet with probability p. We present an analytical analysis of the average system throughput (average spectral efficiency). We compare our proposed scheduling scheme with the proposed scheduling scheme in [1], the optimal selective diversity scheduling scheme (centralized scheduling), and the round-robin scheduling scheme.

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BT - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall

T2 - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall

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ER -

Opportunistic scheduling in decentralized OFDM systems

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