Radar and Communication (RadCom) system based on OFDM and carrier joint optimization

Abstract

The invention belongs to the technical field of communication, and relates to an OFDM-based Radar and Communication (RadCom) system. The method is based on the traditional OFDM system, and is characterized in that at a transmitting end, bit streams to be sent are modulated into data symbols, local waveform retention designing is carried out according to a data bandwidth ratio through the data symbols and a random phase sequence to obtain RadCom frequency domain signals, the signals are then mapped into the time domain through IFFT, Cyclic Prefix (CP) addition is carried out on the mapped signals, and signals obtained through the CP addition are sent to a channel through a radio frequency front end; at a receiving end, CP removal is carried out on the received signals, signals obtained through the CP removal are mapped into the frequency domain through FFT, the mapped signals are equalized to compensate for channel distortions, symbol extraction is carried out on the equalized symbols according to the data bandwidth ratio, and bit information is finally obtained through symbol demodulation; and meanwhile, the frequency domain signals at the transmitting end and the receiving end areused for radar processing. The system provided by the invention has the advantages that the partly retention loop algorithm is introduced, so that the bandwidth can be flexibly allocated under the premise that the advantages of a communication system are maintained, the PAPR can be effectively reduced, and the spectrum utilization efficiency can be improved.

Description

technical field [0001] The invention belongs to the technical field of communication, and relates to a communication radar integrated system based on joint optimization of OFDM carriers. Background technique [0002] As we all know, wireless spectrum is a precious natural resource in radio communication, which is generally allocated in a fixed way and authorized by government agencies. Due to the rapid development of the communication industry, the problem of poor wireless spectrum resources is becoming more and more serious. However, the spectrum in most frequency bands is not fully used. This results in some frequency bands not being used by any users most of the time, while competition for other frequency bands is relatively intense. In LTE technology, the bandwidth usage of OFDM waveform can reach one or several times of 20MHz. In radar applications, in order to ensure detection accuracy, its bandwidth can reach hundreds of megahertz to several thousand megahertz, and ...

AI Technical Summary

Problems solved by technology

Due to the rapid development of the communication industry, the problem of poor wireless spectrum resources is becoming more and more serious, however, the spectrum in most frequency bands is not fully used

This results in some frequency bands not being used by any users most of the time, while other frequency bands are relatively competitive

Images