Abstract
Wireless access in vehicular environments (WAVE), is especially designed to support vehicular ad hoc networks (VANETs) requirements, where rapidly changing channel conditions introduces unsynchronized transmissions. In such networks, instead of dealing with interferences in medium access control (MAC) layer or physical layer alone, both layers should be considered to cooperate and complement each other. In this paper, multipacket detection (MPD) technique with frequency domain equalization (FDE) is proposed for VANETs, with cyclically shifted different interleavers for different nodes, to remove interference and reducing the information exchange between nodes. These promising multi-hop wireless networks are used in situations, where temporary network connectivity is needed. Therefore, to improve the communication between vehicles (V2V) and from vehicles to roadside infrastructure (V2I), MPD-FDE with interference cancellation (IC) schemes can be used iteratively to successfully decode and receive even colliding packets. For designing such a protocol, different key aspects are discussed with an emphasis on iterative MPD-FDE. Numerical results with different network nodes, show the MPD-FDE performances for coded and uncoded transmissions with different IC schemes, where successive IC (SIC) is much better than parallel IC (PIC) schemes. It is also shown that the proposed protocol provide reliable detection and excellent throughput improvements, with much less resource consumption compared to multiple random interleavers.
Highlights
Vehicular ad-hoc networks (VANETs), are one of the important components that needed to develop intelligent transportation systems (ITS)
Topology with to communication pairs are studied and each communication pair is assumed to be within a distance of less than 100 m
For large block sizes ), larger interleaver is guaranteed because bandwidth expansion is exploited before the interleaver, which is favorable for iterative processing
Summary
Vehicular ad-hoc networks (VANETs), are one of the important components that needed to develop intelligent transportation systems (ITS). IEEE 802.11p defines a medium access control (MAC) and a physical (PHY) layer for WAVE. The rapidly changing topology and channel conditions, due to the high mobility of moving vehicles, introduce unsynchronized transmissions, which have a significant negative impact on the effectiveness of this technique. In such systems, the introduced overhead is not acceptable, considering that the contact duration times will be rather small. It is not direct to use such systems in ad hoc networks, where traditional MAC protocols see the PHY layer as a collision model and attempts to prevent simultaneous communications
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