Results 31 to 40 of about 3,263 (149)
Energy Efficient Clustering Based Network Protocol Stack for 3D Airborne Monitoring System
Journal of Computer Networks and Communications, Volume 2017, Issue 1, 2017., 2017 Wireless Sensor Network consists of large number of nodes densely deployed in ad hoc manner. Usually, most of the application areas of WSNs require two‐dimensional (2D) topology. Various emerging application areas such as airborne networks and underwater wireless sensor networks are usually deployed using three‐dimensional (3D) network topology.
Abhishek Joshi +5 more
wiley +1 more source
IET Science, Measurement &Technology, Volume 18, Issue 8, Page 429-442, October 2024.The impact of high‐power electromagnetic on the power amplifier inside the conductive enclosure has been investigated. By using the finite difference delay modelling numerical method as a stable method followed by the vector fitting method, the electromagnetic problem has become a circuit problem, which allows examining the response of the power ...
Ali Kalantarnia, Abdollah Mirzabeigi
wiley +1 more source
Information Security of PHY Layer in Wireless Networks
Journal of Sensors, Volume 2016, Issue 1, 2016., 2016 Since the characteristics of wireless channel are open and broadcasting, wireless networks are very vulnerable to be attacked via eavesdropping, jamming, and interference. As traditional secure technologies are not suitable for PHY layer of wireless networks, physical‐layer security issues become a focus of attention. In this paper, we firstly identify
Weidong Fang +7 more
wiley +1 more source
Sequence optimisation for compressed sensing CDMA MIMO radar via mutual coherence minimisation
IET Radar, Sonar &Navigation, Volume 18, Issue 7, Page 1178-1192, July 2024.The authors focus on optimising waveforms for CDMA‐MIMO radar systems, particularly for Compressed Sensing (CS) based target estimation. The study introduces an optimisation framework to modify phase components of code sequences, aiming to minimise off‐diagonal elements in the Gramian matrix of the sensing matrix.
Saravanan Nagesh +4 more
wiley +1 more source
Assessment of Measurement Distortions in GNSS Antenna Array Space‐Time Processing
International Journal of Antennas and Propagation, Volume 2016, Issue 1, 2016., 2016 Antenna array processing techniques are studied in GNSS as effective tools to mitigate interference in spatial and spatiotemporal domains. However, without specific considerations, the array processing results in biases and distortions in the cross‐ambiguity function (CAF) of the ranging codes.
Thyagaraja Marathe +3 more
wiley +1 more source
Blind equalization of DS-CDMA and MC-CDMA modulations in time-variant frequency selective channels [PDF]
, 1999 The paper addresses the blind equalization problem of spread spectrum modulations in the presence of fast time-variant frequency-selective channels. The basic assumption of the paper is that the channel response exhibits fast changes.
Rey Micolau, Francesc +1 more
core +1 more source
Patient Data Prioritization in the Cross‐Layer Designs of Wireless Body Area Network
Journal of Computer Networks and Communications, Volume 2015, Issue 1, 2015., 2015 In Wireless Body Area Network (WBAN), various biomedical sensors (BMSs) are deployed to monitor various vital signs of a patient for detecting the abnormality of the vital signs. These BMSs inform the medical staff in advance before the patient’s life goes into a threatening situation. In WBAN, routing layer has the same challenges as generally seen in
Fasee Ullah +4 more
wiley +1 more source
Multiuser Detection for the Uplink of Prefix-Assisted DS-CDMA Systems Employing Multiple Transmit and Receive Antennas [PDF]
, 2006 In this paper we consider the uplink transmission within a DS-CDMA system employing CP-assisted (Cylic Prefix) block transmission techniques combined with spatial multiplexing techniques that require multiple antennas at both the transmitter and the ...
Dinis, Rui, Silva, Paulo
core +1 more source
Interference-Free Broadband Single- and Multi-Carrier DS-CDMA
, 2005 The choice of the direct sequence spreading code in DS-CDMA predetermines the properties of the system. This contribution demonstrates that the family of codes exhibiting an interference-free window (IFW) outperforms classic spreading codes, provided ...
Hanzo, L., Hua, W., Yang, L-L.
core +1 more source
Employing A Suppression Filter for MC-DS-CDMA Overlay
International Journal on Electrical Engineering and Informatics, 2013 In this paper, the performance of multicarrier direct sequence code division multiple access (MC-DS-CDMA) system equipped with a suppression filter is analyzed. A suppression filter is used in the MC-DS-CDMA receiver for suppressing narrowband interference (NBI) over a Rayleigh fading channel.
Ahmed E EL-Mahdy, Ashraf Samy
openaire +1 more source