Use this URL to cite or link to this record in EThOS:
Title: Modelling interference in a CSMA/CA wireless network
Author: Tsertou, Athanasia
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2006
Availability of Full Text:
Access from EThOS:
Full text unavailable from EThOS. Please try the link below.
Access from Institution:
Initially, a systematic characterisation of all the possible ways in which two communicating pairs of nodes can interfere with each other is made. Using this as a building block and assuming independence of the stations, an estimate for the network throughput can be derived. The latter proves to be quite accurate for symmetric networks and manages to follow the performance trends in an arbitrary network. Following this, a more detailed Markovian-based mathematical model is proposed for the analysis of the hidden node case. This approach does not rely on common assumptions, such as renewal theory and node synchronisation, and is highly accurate, independently of the system parameters, unlike prior methods. Moreover, the usual decoupling approximation is not adopted; on the contrary, a joint view of the competing stations is taken into consideration. The model is firstly developed based on the assumption that the network stations employ a constant contention window for their backoff process. However, later in the thesis this assumption is relaxed, and performance curves are derived for the case when the stations employ the Binary Exponential Backoff Scheme, as is the case in practice. The Markovian state space is kept relatively small by employing an iterative technique that computes the unknown distributions. The adoption of this technique makes the analysis computationally efficient.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available