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Slotted Aloha with multi-AP diversity and APS transmit beamforming

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Author(s): Zheng Di | Yao Yu-Dong

Journal: EURASIP Journal on Wireless Communications and Networking
ISSN 1687-1472

Volume: 2011;
Issue: 1;
Start page: 119;
Date: 2011;
Original page

Keywords: Slotted Aloha | Multi-access-point diversity | Beamforming | Capture effect | Rayleigh fading | Throughput | Average packet delay

ABSTRACT
Abstract Slotted Aloha is an effective random access protocol and can also be an important element of more advanced media access protocols. This paper investigates slotted Aloha in a radio environment with multiple access points. Specifically, we examine the impact of multi-access-point (multi-AP) diversity on the performance of slotted Aloha. The paper considers both omni-directional (OM) and beamforming (BF) antennas at transmission nodes. This leads to the investigation and comparison of four different network scenarios, i.e., OM with multi-AP diversity, OM without multi-AP diversity, BF with multi-AP diversity and BF without multi-AP diversity. Performance evaluations and comparisons are presented in terms of throughput and average packet delay.
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