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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, the authors 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.
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