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) |
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Title of host publication | 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall |
Pages | 1289-1294 |
Number of pages | 6 |
DOIs | |
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 |
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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