Radar-communication integration based on OFDM signal

Abstract

As the volume of the electronic platform growing with the increase of their functions. It has great significance to utilize single form of signal to realize multiple functions. Since the multicarrier waveform has been widely used in communication and also show good performances in radar, this paper put forward an integrated radar and communication signal based on the OFDM. How to achieve the transmitter and how to transmit the communication data are discussed afterwards. The ambiguity function of the integrated signal is worked out to analysis the characteristics in detail, especially how the random digital sequence affect the radar performance. Theoretical analysis and simulation results show that the integrated signal can satisfy conventional radar detection and have good communication performance.

Radar Communication Integrated Waveform Design Based on OFDM and Circular Shift Sequence

“…where is the complex weight of the th subcarrier, satisfying ∑ −1 =0 | | 2 = 1, , is the th element of the sequence which modulates the th subcarrier, ( ) is the gate function, is subpulse width, = ⋅ Δ is the th subcarrier, Δ = 1/ is frequency space, is the number of subcarriers, and is the number of OFDM symbols. Based on the MCPC technology, especially OFDM technology, two RadCom waveforms are presented [15,17], which can be written as…”

“…, is the phase sequence, which greatly affects the performance of RadCom waveform and different RadCom waveform designing approaches focus on the phase sequence designs. In literature [15], , is designed as direct spread spectrum sequence, while, in [17],…”

“…A typical continuous waveform with good autocorrelation properties is single-carrier based RadCom waveform combined with code-domain (spread spectrum) scheme [11][12][13][14]. In addition, advanced concepts based on multicarrier communication waveforms, also often denoted as orthogonal frequency division multiplexing (OFDM), are proposed [8,[15][16][17][18]. Compared with single-carrier waveform, OFDM waveforms offer a number of advantages, such as the availability of processing gain at the receiver, high spectrum efficiency, and good antimultipath performance.…”

“…To reduce the PMERP of RadCom waveform, one popular method is to design different subcarrier complex weights [15,17] and the other method is utilizing phase code technique [19,20]. These two methods can also be adopted to improve the PSLR of RadCom waveform.…”

“…The reason may be that a lower PMERP always means a poor side lobe level (SLL) suppression when subcarrier complex weight or phase code technique is adopted to reduce the PMERP. In [15], the authors use direct spread spectrum sequence (DSSS) to improve the PSLR of RadCom waveform but ignore the PMERP problem. In [17], chaos-based phase code sequence is utilized to get a good autocorrelation property and the PMERP is suppressed by adding window function.…”