EE Seminar: Blind User Identification in OFDRMA

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Ben Shilo, 
M.Sc. student under the supervision of Dr. Ofer Amrani

Monday, June 15, 2015 at 15:30
Room 011, Kitot Bldg., Faculty of Engineering

Blind User Identification in OFDRMA

Abstract

In the uplink communication of multiple-access OFDM (OFDMA) user identification is usually performed via a preamble (pilot series) where users keep transmitting until the base-station acknowledges them. Thereafter, end-user communication is either assigned by the base-station (e.g. TDD) or, in random access schemes, some sort of collision avoidance mechanism or protocol is used (CSMA/CA, slotted Aloha or more complex frequency hopping schemes).
In a Random OFDMA uplink, the base-station has no knowledge of (who and) when end-users are active, nor does it manage them in any form and no active collision avoidance is exercised. We show that in this scenario, using a one-dimensional decision rule, we can reliably identify the active users subject to target misdetection and false alarm probabilities.