Results 151 to 160 of about 4,521 (202)

Performance of DSSS against Repeater Jamming

2006 13th IEEE International Conference on Electronics, Circuits and Systems, 2006
Direct sequence spread spectrum (DSSS) technique has been widely used in both military communications and commercial communications. The normal jamming types, including broadband noise, partial-band noise and so on, are ineffective at the current jamming power level when the processing gain is large enough.
Hang Wang, Zanji Wang, Jingbo Guo
openaire   +2 more sources

A Robust Demodulator for OQPSK–DSSS System

Circuits, Systems, and Signal Processing, 2014
IEEE802.15.4 standard has quickly become a benchmark in the era of Internet of things. The mandatory mode of 2.4 GHz physical layer of IEEE802.15.4 standard employs offset quadrature phase shift keying (OQPSK) modulation with direct sequence spread spectrum (DSSS). The performance of conventional differential demodulator is not satisfactory.
Shengchen Dai, Hua Qian, Kai Kang, Weidong Xiang   +3 more
openaire   +2 more sources

Compressed Receiver for Multipath DSSS Signals

IEEE Communications Letters, 2014
A compressed sensing (CS) assisted receiver for direct sequence spread spectrum (DSSS) signals transmitted over multipath frequency-selective channels is studied in this paper. We present a bit-error-rate analysis for the CS-domain maximum ratio combining receiver with perfect channel state information (CSI), and hence, the CS-induced signal-to-noise ...
Shuai Wang 0013, Jianping An, Yanyang Ren, Tiexing Wang, Xiangyuan Bu   +4 more
openaire   +2 more sources

PAPR-based DSSS signal detection

2017 International Conference on Information and Communication Technology Convergence (ICTC), 2017
A new detection algorithm for direct sequence spread spectrum (DSSS) signals using peak-to-average power ratio (PAPR) is proposed. The received signals are divided into several blocks. Then we calculate peak-to-average power ratio of each block and we use the average of peak-to-average power ratios as test statistics.
Heetae Jin, Suk Chan Kim
openaire   +2 more sources

Intelligent Multicriteria DSSs

2000
The discussion of the basic MCDA concepts and approaches in chapter 2 demonstrated that the decision maker and his/her preferences constitute the focal point of interest within the MCDA methodological framework. This special characteristic of MCDA is in accordance with the decision making process in complex and ill-structured problem domains.
Constantin Zopounidis, Michael Doumpos
openaire   +1 more source

Security Enhancement of Fix Chaotic-DSSS in WSNs

IEEE Communications Letters, 2018
The security of the physical layer promises to provide secrecy for wireless communication. The chaotic direct sequence spread spectrum (chaotic-DSSS) is one of the distinguished techniques for providing secrecy in wireless communication. However, conventional chaotic-DSSS requires chip synchronization which makes this system complex to implement in ...
Arash Tayebi, Stevan M. Berber, Akshya K. Swain   +2 more
openaire   +2 more sources

A Fast Time-Recursive Correlator for DSSS Communications

IEEE Signal Processing Letters, 2008
Direct sequence spread spectrum (DSSS) correlators synchronize received signals with locally generated replicas. They can be implemented either in time or frequency domains. Time-domain correlators are more flexible in multimode operations, and they are typically preferred in hardware-based implementations.
David Akopian, Sos S. Agaian
openaire   +1 more source

The role of the decision maker in DSSs and representation levels

Proceedings of the Twenty-Eighth Hawaii International Conference on System Sciences, vol.3, 2002
We claim that the role of the decision maker in a DSS is to control a heuristic search. In this context, the models involved in a DSS naturally appear as evaluation functions driving the end-user control. This interpretation, which seems to be natural for P.
Pierre Lévine, Jean-Charles Pomerol
openaire   +2 more sources

An eigenstructure technique for soft synchronization of DSSS signals

1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings, 2002
Soft synchronization of direct sequence spread spectrum (DSSS) signals introduces the capability of despreading the signals with improving estimates of the spreading code. The technique presented here exploits the eigenstructure of a frequency-channelized DSSS signal to estimate the code.
Nitin R. Mangalvedhe, Jeffrey H. Reed
openaire   +2 more sources

Evaluation of Security for DSSS Under Repeater Jamming

2007 IEEE International Conference on Communications, 2007
Direct sequence spread spectrum (DSSS) technique has been widely used in both military communications and commercial communications. On the other hand, it is a challenge to both frequency surveillance and military counter measures. The normal jamming types, including broadband noise, partial-band noise and so on, are ineffective at the current jamming ...
Hang Wang, Jingbo Guo, Zanji Wang
openaire   +1 more source