NDLI: Packet scheduling algorithm to improve throughput and fairness in SDM system using adaptive antenna array

Content Provider	IEEE Xplore Digital Library
Author	Yoshimochi, N. Ofuji, Y. Abeta, S. Esmailzadeh, R. Sasase, I.
Copyright Year	2005
Description	Author affiliation: Dept. of Inf. & Comput. Sci., Keio Univ., Yokohama (Yoshimochi, N.)
Abstract	This paper investigates several downlink packet scheduling algorithms in OFDM based systems for space division multiplexing (SDM) with adaptive antenna array beamforming. The packet scheduling algorithm, which generates directional beams toward accessing users in accordance with the priority based on received signal-to-interference plus noise power ratio (SINR) have been proposed. However, the algorithm can generate few directional beams due to the increase of inter beam interference. As a result, the improvement of overall capacity is limited. In this paper, we propose an algorithm to increase total throughput by increasing the number of directional beams. In our algorithm, difference of angle and interference among directional beams are considered. It is shown that the proposed algorithm can increase the sector throughput by 13 % as compared to the conventional SINR-priority based algorithm. Moreover, we investigate the effect to take into account the channel quality and waiting time of each user in the proposed algorithm from the viewpoint of the sector throughput and the fairness of transmission slot assignment probability. Simulation results show that the proposed algorithm with taking into account the received SINR averaged over the scheduled users improves the sector throughput by 5-10% as compared to the original proposed algorithm. It is also shown that, additionally taking into account the waiting time of the users, although the sector throughput is degraded by 12%, the number of users who have the transmission slot assignment probability of less than 0.1 is reduced by 26% compared to the original proposed algorithm
Starting Page	2146
Ending Page	2150
File Size	969148
Page Count	5
File Format	PDF
ISBN	9783800729098
DOI	10.1109/PIMRC.2005.1651825
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-09-11
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scheduling algorithm Adaptive arrays Throughput Adaptive systems Antenna arrays Signal to noise ratio Interference Downlink OFDM Array signal processing packet scheduling fairness adaptive antenna array beam forming space division multiplexing
Content Type	Text
Resource Type	Article

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