Abstract
In the joint radar and communication system, using orthogonal frequency division multiplexing (OFDM) signals, cyclic prefix (CP) and pilots lead to the problem of high peak at the sidelobe (PSL) level in autocorrelation function (ACF), which deteriorates the radar detection performance seriously. To solve this problem, first, a new RadCom signal based on time-domain synchronization OFDM (TDS-OFDM) was proposed. TDS-OFDM adopts training sequence (TS) for guard interval, as well as synchronization and channel estimation, so that CP and pilots can be avoided. And then, ambiguity function (AF) of TDS-OFDM RadCom signal was analyzed. Finally, TS are optimized to suppress PSL of TDS-OFDM signal and maintain the autocorrelation properties of TS simultaneously. The results show that the autocorrelation performance of designed TDS-OFDM RadCom signal is much better than that of CP-OFDM RadCom signal. Considering the importance of radar target detection, TDS-OFDM is more appropriate than CP-OFDM for the RadCom system.
Highlights
Joint radar and communication (RadCom) is proposed as a technology using a single signal to accomplish both radar and communication functions, which can effectively reduce the load of the platform, energy consumption, and electromagnetic interference, and greatly improve the utilization of energy and spectrum, receiving much attention from military and civil fields [1,2,3,4].Orthogonal frequency division multiplexing (OFDM) is a multicarrier data transmission technology which has been widely used in communication system
The results show that the autocorrelation performance of designed TDS-OFDM RadCom signal is much better than that of cyclic prefix (CP)-OFDM RadCom signal
To achieve communication synchronization and channel estimation, pilots must be used in CPOFDM RadCom signal, but the pilot symbols will lead to the problem of pilot sidelobes
Summary
Joint radar and communication (RadCom) is proposed as a technology using a single signal to accomplish both radar and communication functions, which can effectively reduce the load of the platform, energy consumption, and electromagnetic interference, and greatly improve the utilization of energy and spectrum, receiving much attention from military and civil fields [1,2,3,4]. To achieve communication synchronization and channel estimation, pilots must be used in CPOFDM RadCom signal, but the pilot symbols will lead to the problem of pilot sidelobes. Those sidelobes deteriorate the performance of radar target detection; the application of OFDM radar-communication integration will be severely restricted. A new form of RadCom signal based on TDS-OFDM is proposed, where CP is replaced by training sequences (TS) as guard interval while being employed in communication synchronization and channel estimation. A TS design criterion is proposed, based on which, genetic algorithm is used to search optimal TS; the TDS-OFDM RadCom signal with good performance both in radar and communication is generated.
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