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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/24659

Title: Positive Orthogonal Code-based Cooperative Forwarding for VANETs
Authors: Zhang, Le
Advisor: Valaee, Shahrokh
Department: Electrical and Computer Engineering
Keywords: VANET
Multihop
Multi-Relay
Forwarding
Cooperative
Positive Orthogonal Code
Issue Date: 29-Jul-2010
Abstract: Vehicular Ad hoc Networks (VANET) consist of radio-equipped vehicles and roadside units (RSU) and support many safety and commercial applications. Multi-hop forwarding can extend the communication range of both RSUs and vehicular broadcasts. Recently, the use of Positive Orthogonal Codes (POC) as transmission patterns of repetition-based broadcast medium access control (MAC) for safety messages has been proposed. This thesis proposes a cooperative forwarding protocol in which multiple relays at each forwarding hop form a virtual relay and coordinate their transmission times to correspond to a POC codeword. The protocol thereby exploits spatial diversity while conforming to the POC-based MAC, resulting in fewer collisions and mitigating the effect of hidden terminals. The design is validated through NS2 simulations, which show comparable performance with other forwarding schemes while producing significantly less performance degradation for safety message broadcasts on the same channel.
URI: http://hdl.handle.net/1807/24659
Appears in Collections:Master
The Edward S. Rogers Sr. Department of Electrical & Computer Engineering - Master theses

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