Internet Of Vehicles: Coding Techniques for Safety and Infotainment

Author: Nur Fadzilah Abdullah
Publisher: UKM Press
ISBN: 9789672510239
Weight: 0.314kg
Year: 2021
Page: 208
Price: RM35

Vehicular communication is one of the most important enabling technology to implement a myriad of applications related to traffic safety, traffic efficiency, and infotainment. The main challenge of vehicular communications is the multitude of applications requiring differing quality of service and a wide range of relative speeds between nodes that leads to rapidly changing network topology and density. The specifications for this technology are published in the Wireless Access Vehicular Environments (WAVE) standards to allow fast and reliable communication between vehicles and road infrastructures. The IEEE 802.11p standard uses preamble-based channel estimation that is insufficient for vehicular channels, which suffer from extreme multipath channel conditions and have very short coherence time. 

Additional training symbols are used to increase the quality of the channel estimates. Besides that, a multiple antenna space-time block code scheme is used to increase robustness to high Doppler and delay spread channels. With plenty of space available on a vehicle, uncorrelated multi-antenna channels can be expected to maximize coding gain. Systematic rateless codes are adopted in safety and infotainment applications because they are highly scalable and fault-tolerant, where the code rate can be reconfigured on-the-fly without a priori knowledge of channel conditions. A rateless decode-and-forward relaying scheme with a very efficient acknowledgment feedback channel provides further improvement to the probability of decoding success and aggregate throughput compared to conventional schemes.