Results 151 to 160 of about 363,353 (192)

A waveform with low intercept probability for OFDM SAR

2016 Progress in Electromagnetic Research Symposium (PIERS), 2016
In this paper, we propose a novel orthogonal frequency-division multiplexing (OFDM) waveform with low probability of intercept (LPI) and the corresponding synthetic aperture radar (SAR) processing algorithm. The OFDM waveform has a random spectrum for each pulse, making it a good candidate for low probability of intercept system implementation. The SAR
null Xiang Yu, null Yaowen Fu, null Lei Nie, null Guanhua Zhao, null Wenpeng Zhang   +4 more
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Low Probability of Intercept (LPI)

1998
Low probability of intercept (LPI) is the term used for there being a low probability that a radar's emissions will be usefully detected by an intercept receiver in another aircraft or on the ground. For the air battle of the future, LPI is essential. In conventional aircraft the most important need for LPI is to avoid electronic countermeasures.
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Low probability of intercept R-Conjugate CDMA codes

IEEE Southeastcon 2009, 2009
Privacy and security have become increasingly important in code division multiple access (CDMA) systems, for both cellular and military applications. One way to improve security is to use spreading code diversity to transmit user information, a technique known as multi-code CDMA. In this paper, we present a new method of generating codes for multi-code
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On the Intercept Probability of DF Relaying Wireless Communication

Wireless Personal Communications, 2018
In this work, we determine the probability of intercept for relaying wireless communication over Nakagami-m faded environment. An eavesdropper attempts to intercept the transmitted signal on link between a source and relay as well as between relay and destination. We used the decode-and forward relay to enhance the physical layer security of the system.
Nenad D. Milošević, Jelena A. Anastasov, Aleksandra M. Cvetković, Daniela M. Milović, Dejan N. Milić   +4 more
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Detection of multiple access low-probability-of-intercept networks

Proceedings of TCC'94 - Tactical Communications Conference, 2002
Increased demands for highly connective, yet covert, communications in the tactical battlefield have fueled the development of so-called multiple access low-probability-of-intercept (MALPI) networks. Although there have been a number of research efforts regarding the design of MALPI networks, detectability analyses are typically carried out for a ...
R.F. Mills, G.E. Prescott
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Optimalwaveform design for MIMO radarwith low probability of interception

2011 17th International Conference on Digital Signal Processing (DSP), 2011
In this paper, we consider the waveform design problem of multiple input multiple output (MIMO) radar in the presence of an interceptor. By the joint considerations of high estimation accuracy and low probability of interception, we formulate the problem as maximizing the mutual information with a constraint on the Kullback-Liebler (KL) divergence ...
null Songbai Wang, null Jian Wang, null Jianshu Chen, null Xiuming Shan   +3 more
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A multicarrier CDMA based low probability of intercept network

2010 National Conference On Communications (NCC), 2010
The need for covert communication in tactical battlefields has developed the ideas of low probability of intercept (LPI) networks. Spread spectrum communication is used for LPI communication. Multicarrier CDMA is a new type of spread spectrum technique that has been developed in recent years.
Sayan Ghosal, Devendra Jalihal, K. Giridhar   +2 more
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Blind parameter estimation of low probability of intercept waveforms

Proceedings 7th International Conference on Signal Processing, 2004. Proceedings. ICSP '04. 2004., 2005
A novel algorithm to estimate the parameter of low probability of intercept waveforms is presented, based on RAT, de-chirp and FRFT. Except for carrier frequency and chirp rate of triangular linear frequency modulation continue waveform (TLFMCW), modulation bandwidth and modulation period are also given.
null Yuan Weiming, null Wu Shunjun
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Low Probability of Intercept Performance Bounds for Spread-Spectrum Systems

IEEE Journal on Selected Areas in Communications, 1985
An important application of spread-spectrum (SS) in military communication systems is that of making the signal difficult to intercept by unauthorized receivers. Error-correction coding techniques may be employed to reduce the required input signal-to-noise ratio at the receiver, allowing the system to operate at a lower power level, hence resulting in
E. Chandler, G. Cooper
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Probability of Satellite Interception by an Air Launched Pre-Guided Missile

ARS Journal, 1961
The following note develops a simple computational model containing the timing, operational and mechanistic error parameters expected to be present in at tempts at satellite interception utilizing an aircraft launched, pre-guided missile. Such a model will introduce simplifying approximations, bu t its value lies in its ability to measure the relative ...
Jacobs, E. M., Morgenthaler, G. W., Sebastian, R. A.   +2 more
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