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

2017 ◽  
Vol 2017 ◽  
pp. 1-10
Author(s):  
Cong Li ◽  
Weimin Bao ◽  
Luping Xu ◽  
Hua Zhang ◽  
Ziyang Huang
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Gray Code ◽  
Side Lobe ◽  
Waveform Design ◽  
Simulation Experiments ◽  
Fuzzy Function ◽  
Good Ability ◽  
Cyclic Sequence ◽  
Shift Sequence ◽  
Radar Sensing

Based on the orthogonal frequency division multiplexing (OFDM) technique, an intelligent waveform is designed, which is suitable for simultaneously performing data transmission and radar sensing. In view of the inherent high peak-to-mean envelope power ratio (PMERP) and poor peak-to-side-lobe ratio (PSLR) problems in the OFDM based radar and communication (RadCom) waveform design, we propose two technologies to deal with that. To be specific, we adopt Gray code technology to reduce the PMERP and simultaneously choose an optimal cyclic sequence to improve the PSLR of RadCom waveform. In our method, the optimal cyclic sequence is dynamically generated to continuously provide the best waveform according to the change of communication data. In addition, to meet the requirements of different radar detection tasks, two simple methods are utilized to adjust the bandwidth of RadCom waveform. To verify the advantages of the designed waveform, we conduct several simulation experiments to compare with some existing RadCom waveforms. The results show that our designed RadCom waveform can simultaneously achieve lower PMERP and higher PSLR. In addition, our designed RadCom waveform has a thumbtack type fuzzy function and shows the good ability to do multitarget detection.

Composite Waveform Design of Phase Coding and Linear FM for MIMO Radar

2013 ◽  
Vol 421 ◽  
pp. 731-736
Author(s):  
Hang Rong Xu ◽  
Song Liu ◽  
Jing Ping Liu ◽  
Hui Chang Zhao
Keyword(s):  
Cost Function ◽  
Waveform Design ◽  
Mimo Radar ◽  
New Method ◽  
Theory Analysis ◽  
Simulation Experiments ◽  
Wide Bandwidth ◽  
Phase Coding

A new method is proposed to design composite waveform for MIMO radar based on phase coding and linear FM. Compared with the traditional MIMO phase coding signal, the new method has some merits such as the wide bandwidth and being realized in practice. The optimizational cost function is formulated, and simulation experiments verify the correctness of theory analysis and validity of optimizational method.

scholarly journals OFDM-IM for Joint Communication and Radar-Sensing: A Promising Waveform for Dual Functionality

2021 ◽  
Vol 2 ◽  
Author(s):  
Mehmet Mert Şahin ◽  
Ilter Erol Gurol ◽  
Emre Arslan ◽  
Ertugrul Basar ◽  
Huseyin Arslan
Keyword(s):  
Frequency Band ◽  
Orthogonal Frequency Division Multiplexing ◽  
Wireless Systems ◽  
Frequency Division ◽  
Dual Functional ◽  
Complementary Sequences ◽  
Radar Applications ◽  
Pilot Design ◽  
Radar Sensing ◽  
Index Modulation

The demand for dual-functional wireless systems is on the rise as certain resources become more congested and scarce. Joint communication-radar (JCR) is a promising technology that is becoming very critical and growing in popularity, where communication and radar applications are serviced simultaneously sharing the same hardware/software and the frequency band resources. JCR and its alternatives need to be cleverly integrated into certain waveforms such as orthogonal frequency division multiplexing (OFDM) to function properly without degradation in the performance. With the aid of the promising concepts of index modulation (IM) and Golay complementary sequences, a novel JCR waveform is proposed to serve both communication and radar applications with the same resources. It has been shown by extensive computer simulations that the proposed OFDM with an index modulation (OFDM-IM) waveform outperforms the classical OFDM with fixed pilot design both in bit error rate (BER) performance and radar-based applications by introducing diversity among subcarriers and frequency agility over the whole frequency band.

An Improved OFDM Timing Synchronization Algorithm

2012 ◽  
Vol 220-223 ◽  
pp. 2419-2422
Author(s):  
Jing Dai ◽  
Fei Fei Guo ◽  
Guo Lin Zhang
Keyword(s):  
Orthogonal Frequency Division Multiplexing ◽  
Side Lobe ◽  
Training Sequence ◽  
Timing Synchronization ◽  
Synchronization Errors ◽  
Synchronization Algorithm ◽  
Carrier Communication ◽  
Conventional Algorithm ◽  
Synchronization Performance ◽  
Improved Algorithm

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier communication system and the system is very sensitive to synchronization errors. The problem that synchronization is not accurate can reduce the system performance largely. Based on the research of Schmidl & Cox and Minn algorithms, the paper proposed an improved timing synchronization algorithm by using the new training sequence in the frequency domain. The improved algorithm eliminates the peak platform problem and side lobe peak problem of the conventional synchronization algorithms in this article. The simulation at MATLAB shows that the improved algorithm overcomes the problems of the conventional algorithms and the timing judgment curve of the improved algorithm also has a very sharp peak at the timing synchronization position, compared with the conventional algorithm. So, the timing synchronization performance of the algorithm is better.

Design of OFDM Signal with Good Autocorrelation for Ground Penetrating Radar

Frequenz ◽  
2015 ◽  
Vol 69 (7-8) ◽  
Author(s):  
Shi Zheng ◽  
Xuehan Pan ◽  
Anxue Zhang ◽  
Yansheng Jiang ◽  
Wenbing Wang
Keyword(s):  
Ground Penetrating Radar ◽  
Orthogonal Frequency Division Multiplexing ◽  
Side Lobe ◽  
Main Lobe ◽  
False Alarms ◽  
Main Function ◽  
Signal Design ◽  
Ofdm Signal ◽  
Periodic Autocorrelation ◽  
Ground Penetrating

AbstractOrthogonal frequency division multiplexing (OFDM)-based ground penetrating radar (GPR) has been proved to have a number of advantages. To improve the performance of a GPR system, time domain non-periodic autocorrelation (AC) of the transmitted OFDM signal should be designed to have similar shape to an ideal pulse. Challenge in OFDM signal design for GPR is that there is little pertinent literature and the design should be different from that in communication and air radar fields. In this paper, we propose a design scheme of OFDM signal with good AC for GPR. We divide the AC into main lobe and side lobe with proving that the main lobe is dominated with the functionality of the modulating amplitudes while the side lobe’s main function is modulating phases. Thus, modulating amplitudes and phases can be designed, respectively. Performance of this proposed approach is demonstrated by numerical examples. The results show that the designed OFDM signal yields a better AC and fewer false alarms for GPR systems.

scholarly journals HRR Profiling on Integrated Radar-Communication Systems Using OFDM-PCSF Signals

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Xuanxuan Tian ◽  
Tingting Zhang ◽  
Qinyu Zhang ◽  
Zhaohui Song
Keyword(s):  
Communication Systems ◽  
Orthogonal Frequency Division Multiplexing ◽  
Waveform Design ◽  
Data Rate ◽  
Frequency Division ◽  
Range Resolution ◽  
High Data ◽  
Range Profile ◽  
Transmission Data ◽  
Stepped Frequency

In order to improve both the transmission data rate and the range resolution simultaneously in integrated radar-communication (RadCom) systems, orthogonal frequency-division multiplexing with phase-coded and stepped-frequency (OFDM-PCSF) waveform is proposed. A corresponding high resolution range (HRR) profile generation method is also presented. We first perform OFDM-PCSF waveform design by combining the intrapulse phase coding with the interpulse stepped-frequency modulation. We then give the ambiguity function (AF) based on the presented waveforms. Then, the synthetic range profile (SRP) processing to achieve HRR performance is analyzed. Theoretical analysis and simulation results show that the proposed methods can achieve HRR profiles of the targets and high data rate transmissions, while a relative low computational complexity can be achieved.

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