Method for integrating OFDM radar communication signals

Abstract

The invention belongs to the technical field of signal detection communication and discloses a method for integrating OFDM radar communication signals. Communication signals are embedded into each subcarrier in OFDM radar signals, thereby integrating the communication radar signals. The radar performance and communication performance are adjustable in a multi-phase coding mode. Through combination of a gray code technology and a sequence cyclic shift technology, a peak-to-average ratio and a main lobe and side lobe ratio of an integrated signal are reduced at the same time. According to the method, the communication signals are embedded into each subcarrier in the OFDM radar signals, thereby integrating the communication radar signals; the radar performance and communication performance are flexibly adjustable in the multi-phase coding mode; and for the problem that the peak-to-average ratio and the radar main lobe and side lobe ratio of the OFDM integrated signal based on multi-phase coding are relatively high, the peak-to-average ratio and the main lobe and side lobe ratio of the integrated signal are reduced at the same time through combination of the gray code technology and the sequence cyclic shift technology.

Description

technical field [0001] The invention belongs to the technical field of signal detection communication, and in particular relates to a method for realizing the integration of OFDM radar communication signals. Background technique [0002] Multi-carrier, especially Orthogonal Frequency Division Multiplexing (OFDM) technology is also widely used in integrated waveform design. Compared with the single-carrier system, the OFDM system has been widely used in RCI system design because of its high spectral efficiency, good anti-multipath ability and no Doppler effect. In order to reduce the peak-to-average ratio of OFDM-based systems, the most common method is to design different subcarrier weights and use window functions to limit the amplitude. But these methods are a kind of lossy clipping, and the signal cannot be recovered after clipping. This is unacceptable for integrated communication signals. In addition, after the conventional method reduces the peak-to-average ratio of...

AI Technical Summary

Problems solved by technology

If the bandwidth of the communication subsystem is deliberately designed to be as large as that of the radar subsystem, this will cause loss of communication signals

If the bandwidth of the radar is deliberately designed to be as low as the communication, it will lead to a decrease in the performance of the radar

[0003] In summary, the existing problems in the prior art are: the current peak-to-average ratio of the OFDM integrated signal of multi-phase encoding is too high and the radar main side lobe ratio is too high; too high peak-to-average ratio will lead to signal distortion The dynamic range becomes larger, and the requirements for the dynamic range of the receiving end are higher. When the characteristics of the signal cannot be satisfied, some signals will be lost.

Radar main-side lobe ratio is too high, indicating that the effective energy of the radar is not concentrated enough, in addition to the interference caused by the side lobes, it will also greatly reduce the detection performance of the radar

Images