Event Details
Some Issues on Packet-Based Communications
Presenter: Daniela Djonin, ECE Dept.
Supervisor:
Date: Thu, January 16, 2003
Time: 15:00:00 - 16:00:00
Place: EOW 430
ABSTRACT
Abstract:
In this presentation, two topics are explored.
In the first part, a novel approach to evaluation of upper bounds on attainable information rates of coded packet based single and multiple access channels is presented. The succession of active and idle periods is modeled with a Markov process implying that additive noise-contaminated channel output is a Hidden Markov Process. The increase in capacity that might be achieved through exploitation of timing information is evaluated for packet based binary and Gaussian single access channel as well as for Gaussian bursty two user multiple-access channel.
In the second part of the presentation, adaptive variable-rate constant-power transmission, using modified CSMA/CA protocol is investigated. By means of simulation, the performances of one-rate and two-rate systems are compared. Advantages of two-rate system over one-rate system are observed and measured, depending on the number of users, their placement, propagation coefficient, user activity and packet length.
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