Results 161 to 170 of about 4,521 (202)
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Adaptive acquisition of PN sequences for DSSS communications
IEEE Transactions on Communications, 1998Since the received signal levels in mobile communications are unknown and the location is varying, acquisition schemes for pseudonoise (PN) sequences with fixed thresholds cannot provide satisfactory performance. This fixed-threshold scheme may cause too many false alarms or result in a low detection probability for a selected threshold value.
Chang-Joo Kim +2 more
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Feasibility Assessment of Repeater Jamming Technique for DSSS
2007 IEEE Wireless Communications and Networking Conference, 2007Direct sequence spread spectrum (DSSS) systems spread the baseband data signal over a broad bandwidth to achieve anti-jamming protection, which increase the difficulty of spectrum surveillance. The current jamming types, including broadband noise, partial-band noise and so on, are ineffective at the current jamming power level when the processing gain ...
Hang Wang, Jingbo Guo, Zanji Wang
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Improving DSSS transmission security using Barker code along binary compliments (CBC12-DSSS)
2012 International Conference on Emerging Technologies, 2012Direct sequence spread spectrum is one of the three fundamental techniques (other two are FHSS and THSS) of Spread Spectrum communication. In DSSS the digital information signal or user data is multiplied with a high-bit rate Barker code to spread the spectrum.
Shahid Latif +3 more
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Efficient DSSS burst synchronization methods
Proceedings of ISSSTA'95 International Symposium on Spread Spectrum Techniques and Applications, 2002This paper treats the synchronization of packetized (burst like) direct sequence spread spectrum (DSSS) signals. Burst lengths up to 200 bits with binary phase shift keying (BPSK) modulation are considered. Under the condition of receive signal levels below the noise level this is a very critical enterprise as rapid burst detection and acquisition ...
U. Kaage, E. Kolble
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A Consistency Checker for verifying the knowledge encoded into clinical DSSs
2012 25th IEEE International Symposium on Computer-Based Medical Systems (CBMS), 2012The formalization and manipulation of complex and not yet assessed rules by clinicians are critical for Decision Support Systems (DSSs) performance in supporting remote monitoring of chronic patients. Sometimes, structural anomalies, such as inconsistency and redundancy, can occur.
Eugenio Cesario +3 more
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A Knowledge-based Method for Verifying the Reliability of Clinical DSSs
2012 Eighth International Conference on Signal Image Technology and Internet Based Systems, 2012Recently, the usage of innovative decision support systems (DSSs) for monitoring the subject's health status in the daily living is becoming a common practice to provide real aid in chronic patients' management. Rule-based implementations of such DSSs simulate the decision-making process described in clinical guidelines by also allowing new/existing ...
Cesario Eugenio, Esposito Massimo
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Suppression of Sinusoidal Frequency Modulation Interference in DSSS Systems
Wireless Personal Communications, 2010For the wideband nonstationary sinusoidal frequency modulation (SFM) interference in DSSS systems, the paper proposes a method to estimate partial parameters of the interference, and then an interference suppression algorithm is developed. The performance of the algorithm is analyzed. Simulations show that the algorithm can efficiently suppress the SFM
Yongjun Sun +3 more
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2000 IEEE Sixth International Symposium on Spread Spectrum Techniques and Applications. ISSTA 2000. Proceedings (Cat. No.00TH8536), 2002
The direct sequence spread spectrum (DSSS) modulation technique has been widely used for a number of years. For point-to-point applications, LETI has proposed the concept of a matched filter receiver able to take into account all the propagation path signals implementing a diversity combining method.
J.R. Lequepeys +9 more
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The direct sequence spread spectrum (DSSS) modulation technique has been widely used for a number of years. For point-to-point applications, LETI has proposed the concept of a matched filter receiver able to take into account all the propagation path signals implementing a diversity combining method.
J.R. Lequepeys +9 more
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2016
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Analysis of an Eigenstructure Technique for DSSS Synchronization
1997A new technique for synchronization of direct sequence spread spectrum (DSSS) signals is presented. This technique exploits the eigenstructure of a frequency-channelized DSSS signal to directly estimate the underlying spreading code. The synchronous estimate of the spreading code steadily improves with the increase in the collected data. In this paper,
Nitin R. Mangalvedhe, Jeffrey H. Reed
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