scholarly journals Orthogonal Waveform Design for Radar-Embedded Communications

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1107
Author(s):  
Jianqiu Xu ◽  
Baoguo Li ◽  
Zhitao Huang ◽  
Jing Lei
Keyword(s):  
Computational Complexity ◽  
Theoretical Analysis ◽  
Waveform Design ◽  
Covert Communication ◽  
Spectrum Utilization ◽  
Response Delay ◽  
Communication Reliability ◽  
Low Probability ◽  
Simulation Results ◽  
Low Probability Of Intercept

This paper focuses on the waveform design for a radar-embedded communication (REC) system which can achieve covert communication while improving the spectrum utilization. In order to solve the problem that the conventional embedded communication waveforms are not orthogonal, this paper proposes the orthogonal weighted-combining (OWC) strategy and the orthogonal dominant-projection (ODP) strategy. Furthermore, the OWC strategy can be broken into two strategies: constrained weighted-combining (CWC) strategy and improved weighted-combining (IWC) strategy. Theoretical analysis and simulation results have shown that these three strategies can dramatically improve communication reliability. Moreover, the performance of the strategies mentioned above has been assessed by the low probability of intercept (LPI) metric. Comparing to the traditional strategies, the IWC strategy shows better LPI performance while the CWC strategy and ODP strategy remain unchanged. Additionally, the ODP strategy can also reduce computational complexity and response delay, which is rather important in the REC system. Any of the three strategies can be selected in accordance with the needs of the application scenario.

scholarly journals Sparse Frequency Waveform Design for Radar-Embedded Communication

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Chaoyun Mai ◽  
Jinping Sun ◽  
Rui Zhou ◽  
Guohua Wang
Keyword(s):  
Waveform Design ◽  
Eigenvalue Decomposition ◽  
Covert Communication ◽  
Communication Signals ◽  
Power Spectral ◽  
Signal Error ◽  
Density Fitting ◽  
Low Probability ◽  
Simulation Results ◽  
Quasi Newton

According to the Tag application with function of covert communication, a method for sparse frequency waveform design based on radar-embedded communication is proposed. Firstly, sparse frequency waveforms are designed based on power spectral density fitting and quasi-Newton method. Secondly, the eigenvalue decomposition of the sparse frequency waveform sequence is used to get the dominant space. Finally the communication waveforms are designed through the projection of orthogonal pseudorandom vectors in the vertical subspace. Compared with the linear frequency modulation waveform, the sparse frequency waveform can further improve the bandwidth occupation of communication signals, thus achieving higher communication rate. A certain correlation exists between the reciprocally orthogonal communication signals samples and the sparse frequency waveform, which guarantees the low SER (signal error rate) and LPI (low probability of intercept). The simulation results verify the effectiveness of this method.

Research on a Kind of Algorithm Cell Search in TD-LTE System

2013 ◽  
Vol 756-759 ◽  
pp. 4078-4081
Author(s):  
Fa Tang Chen ◽  
Chi Yun Xu
Keyword(s):  
Computational Complexity ◽  
Theoretical Analysis ◽  
Low Complexity ◽  
Theory Analysis ◽  
Cell Search ◽  
Low Complexity Implementation ◽  
Simulation Results ◽  
Implementation Method

According to the theoretical analysis of Zadoff-Chu sequence and theoretical derivation.A kind of low complexity implementation method of algorithm in cell search in TD-LTE system is proposed in this paper. Both the theory analysis and simulation results show that the algorithm proposed can reduce computational complexity and this algorithm is feasible and efficient, which gains good performance of cell search in TD-LTE system.

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