Constant envelope OFDM RadCom fusion system

Yixuan Huang,Dan Huang,Shiyong Ma,Yuan Gao,Rong Shi,Su Hu,Qu Luo

doi:10.1186/s13638-018-1105-6

Abstract

A joint radar and wireless communication (RadCom) fusion system is an important trend for future intelligent transportation, such as the Internet of Vehicles (IOV). However, traditional joint orthogonal frequency division multiplexing (OFDM)-based RadCom fusion system suffers from the problem of high peak-to-average power ratio (PAPR) of transmission signals, leading to nonlinear distortion in high power amplifiers (HPAs). To solve this problem, a new constant envelope OFDM RadCom approach is proposed in this paper. Taking phase modulation into consideration, the constant envelope OFDM RadCom system obtains 0 dB PAPR value, which results in linear high power amplifier being feasible. In the receiver side, both communication transmission and target detection are guaranteed by a phase demodulator and frequency-domain signal processing algorithm, respectively. Simulation results demonstrate that the constant envelope OFDM RadCom system is a feasible solution for future IOV with the capability of target detection and wireless communication simultaneously.

Highlights

1 Introduction For future Internet of Vehicles (IOV) systems, all vehicles adopt both wireless communication and radar equipment in order to improve the safety of its drivers [1]
When Eb/N0 is 13 dB, the constant envelope orthogonal frequency division multiplexing (OFDM) (CE-OFDM) bit error rate (BER) with 64 paths is around 0.0001. It proves that the BER performance of CE-OFDM radar and wireless communication (RadCom) systems is improved with the increasing number of path, which means it is able to achieve multipath diversity
When the input of detection processor is the reflected CE-OFDM signal and additive white Gaussian noise (AWGN), detection probability for the CE-OFDM RadCom system is defined as the probability that the maximum output value of detection processor is higher than DT, α

Summary

Introduction

For future Internet of Vehicles (IOV) systems, all vehicles adopt both wireless communication and radar equipment in order to improve the safety of its drivers [1]. The CE-OFDM RadCom fusion approach is able to accomplish environment detection and wireless communication simultaneously with the same CE-OFDM transmitted signals Straightforward, this fusion approach makes the continuous CE-OFDM system append detection function within the same time-frequency resources. To make radar processing easier, the time-domain CE-OFDM multi-carrier transmitted signal can be expressed as [7,8,9]. The vector k R and the vector k D describe the influence of range and the Doppler introduced by the reflecting object on the received frequency-domain symbols. The relative velocity vrel is translated into a linear phase shift between the frequency-domain symbols on the time axle.

24 GHz 1024

Simulation and analysis results for detection

Detection probability

Conclusions