Vehicle-to-vehicle communication and ranging system using spread spectrum technique (Proposal of Boomerang Transmission System)

The system is intended to promote safety and minimize traffic jams. In the system, a vehicle (vehicle 1) transmits a PN code signal to another vehicle (vehicle 2). Vehicle 2 multiples its own information by the PN code signal from vehicle 1, without knowing the PN code sequence, and retransmits to vehicle 1. Vehicle 1 demodulates the signal from vehicle 2 by the SS technique with the PN code sequence which vehicle 1 owns. It then can correctly know the information from vehicle 2 and can range the distance between it and vehicle 2 at the same time. From computer simulations, it is confirmed that the proposed system is effective, even when interference signals exist.