| With the development of electronic information technology,the operating bands of radar detection systems and wireless communication systems have converged,making the integration of communication and radar research a key issue in solving complex electromagnetic environments and achieving multifunctionality.This thesis focuses on the scenario of orthogonal frequency-division multiplexing(OFDM)secure communication and radar integration system.By designing integrated resource allocation and beamforming algorithms,the total power of the system is effectively reduced while ensuring radar detection and secure communication performance,improving the energy efficiency of the integrated system.The main work of this thesis is as follows:Firstly,this thesis analyzes the feasibility of combining communication system with radar system to form integrated communication and radar system,summarizes the advantages and disadvantages of five implementation methods,and chooses frequency-division multiplexing.Secondly,this thesis proposes four different resource allocation algorithms for OFDM secure communication and radar integration system,based on subcarrier pre-allocation,greedy algorithm,dual ascent algorithm and penalty-dual decomposition(PDD)algorithm,and compares their performance and advantages through simulation experiments.The results show that compared with subcarrier random allocation and subcarrier power uniform allocation algorithms,the four designed algorithms can obtain smaller total power of the system while ensuring the performance of secure communication and radar,and each has its own advantages,which can be selected and used according to the different needs of the integrated system.Finally,this thesis extends OFDM secure communication and radar integration from single-input single-output(SISO)scenarios to multiple-input multiple-output(MIMO)scenarios,gives the radar beamforming and secure communication beamforming that minimize system power,and proposes an integrated beamforming algorithm by combining them with the resource allocation algorithm in chapter 3.Through simulation experiments,it is verified that using radar and secure communication beamforming algorithms can effectively reduce the total power of the system,while using integrated beamforming algorithm can further reduce the system power.In conclusion,the research of this thesis shows that using appropriate resource allocation and beamforming algorithms in OFDM secure communication and radar integration systems can effectively improve system performance and efficiency,providing strong support and reference for practical applications. |
