TY - GEN
T1 - Opportunistic scheduling in decentralized OFDM systems
AU - Al-Harthi, Yahya S.
AU - Tewfik, Ahmed H.
AU - Alouini, Mohamed Slim
PY - 2006
Y1 - 2006
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.
UR - http://www.scopus.com/inward/record.url?scp=34548860384&partnerID=8YFLogxK
U2 - 10.1109/VTCF.2006.270
DO - 10.1109/VTCF.2006.270
M3 - Conference contribution
AN - SCOPUS:34548860384
SN - 1424400635
SN - 9781424400638
T3 - IEEE Vehicular Technology Conference
SP - 1289
EP - 1294
BT - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
T2 - 2006 IEEE 64th Vehicular Technology Conference, VTC-2006 Fall
Y2 - 25 September 2006 through 28 September 2006
ER -