Application of hash function for generation of modulation data in RadCom system

Abstract

The challenge of current radiocommunication systems is the efficient use of the frequency spectrum. One of the rapidly evolving tools is a RadCom system, which combines the functionality of a radar sensor with a communication interface. RadCom systems are used in several fields, and the presented work is focused on their applications in the automotive industry. The goal was to design a modulation technique and generate modulation data, which will be suitable for radar determination of the distance and velocity of targets, but also enable their mutual communication. A model of the RadCom system, which simultaneously allows a simulation of detection and communication of several moving targets, has been developed. Herein, a method of generating pseudo-random data based on the MD5 hashing algorithm is described. The proposed method of radar signal processing enables unambiguous detection of moving targets and determination of the position and velocity of these targets. Principles of synchronization and coding of a radar and communication mode of the RadCom system are explained. A numerical verification of the proposed algorithms using simulation tools is discussed in the final part of the work. The proposed system solution achieves more than 70% probability that the decoded message will not contain erroneous bits.