Search results with tag "Spread spectrum"
Tutorial on Basic Link Budget Analysis
sss-mag.comSpread Spectrum Radios The term “spread spectrum” simply means that the energy radiated by the transmitter is spread out over a wider amount of the RF spectrum than would otherwise be used. By spreading out the energy, it is far less likely that two users sharing the same spectrum will interfere with each other.
Frequency Hopping Spread Spectrum (FHSS)
sorin-schwartz.comFHSS vs. DSSS page 4 of 16 sorin m. schwartz seminars Table of Contents A.- Basic Principles - Spread Spectrum - Frequency Hopping Spread Spectrum (FHSS) - Direct Sequence Spread Spectrum (DSSS) B.- IEEE 802.11 - List of IEEE Task Groups (as of December 2001) - FHSS main parameters - DSSS main parameters C.- Systems Behavior - Systems Collocation
Comparison of QPSK/QAM OFDM and Spread Spectrum for …
www.ieee802.org2000-09-02 IEEE 802.16.3c-00/23 3 Spread Spectrum Spread spectrum is divided into 2 groups: frequency hopping spread spectrum (FHSS), and direct sequence
Processing Gain in Spread Spectrum Signals.
www.sss-mag.com1 Processing Gain in Spread Spectrum Signals. John Fakatselis Harris Semiconductor P.O. Box 883, Melbourne, FL. 32902-0883 ABSTRACT This paper addresses the processing gain (PG) characteristics of Spread Spectrum Systems.
Introduction to Digital Data Transmission
www.eg.bucknell.eduSpread spectrum despreader Receiver front end Source encoder {1,2, . . ,q} Encryptor Code rate: Channel encoder Data modulator Spread spectrum modulator Power amplification (power limitation) Spreading code generator Waveform channel (bandwidth limitation) Timing and synchro-nization Noise Discrete (memoryless) channel Source rate: R m 1 T m ...
Global Navigation Satellite System (GNSS)
www.princeton.eduL t a P t W t f t a C A t D t f t π π π = = + (1) The signal broadcast by the satellite is a spread spectrum signal, which makes it less prone to jamming. The basic concept of spread spectrum technique is that the information waveform with small bandwidth is converted by modulating it with a large-bandwidth waveform (Hofmann-Wellenhof et al ...
1000BASE-TGigabit Ethernet - UNH InterOperability Laboratory
www.iol.unh.eduof time, thus the power is spread out over a range in the frequency spectrum. This type of technique is oft referred to as “spread spectrum” as it effectively whitens the frequency content of the signal and thereby reduces the power of any particular frequency component. This technique also makes more
MAX9259/MAX9260 Gigabit Multimedia Serial Link with …
datasheets.maximintegrated.comlength and enhance the link reliability. Spread spectrum is available to reduce EMI on the serial and parallel out-put data signals. The differential link complies with the ISO 10605 and IEC 61000-4-2 ESD-protection standards. The core supplies for the MAX9259/MAX9260 are 1.8V and 3.3V, respectively. Both devices use an I/O sup-ply from 1.8V to ...
Introduction to Ad hoc Networks - Department of …
www.cs.jhu.eduOperates in the unlicensed 2.4 GHZ ISM (Industrial & Scientific & Medical) Band 802.11 MAC works with different physical layers (infra red as well as spread spectrum) Compatible with other 802.x standards, e.g. 802.3 (Ethernet), 802.5 (Token ring) Data rates 1 Mbps (mandatory), 2 Mbps (optional)
EN 300 328 - V1.8.1 - Electromagnetic compatibility and ...
www.etsi.orgETSI 2 ETSI EN 300 328 V1.8.1 (2012-06) Reference REN/ERM-TG11-009 Keywords data, ISM, LAN, mobile, radio, regulation, spread spectrum, SRD, testing, transmission, UHF
Developing Bluetooth Audio Devices - Silicon Labs
www.silabs.comto RS-232 data cables to exchange data over short distances using radio transmissions. • Bluetooth operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping, full-duplex signal at …
LTC7803 40V Low IQ, 3MHz Synchronous Step-Down …
www.analog.comController with Spread Spectrum The LTC®7803 is a high performance, 100% Duty Cycle Capable, synchronous step-down DC/DC switching regulator controller that drives an all N-channel power MOSFET stage. Synchronous rectification increases effi-ciency, reduces power losses and eases thermal require-ments. A constant frequency current mode ...
LT8390 - 60V Synchronous 4-Switch Buck-Boost …
www.analog.comL8390 1 8390 For more information www.linear.com/LT8390 TYPICAL APPLICATION FEATURES DESCRIPTION 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum
TPS92692 LED Controller with Spread Spectrum …
www.ti.comvctrl tps92692-q1 vin vref flt ss dm rt comp imon iadj dim/pwm vcc gate is gnd slope ov csp csn pdrv ramp 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 vin led + led í l c in c vref c ss c dm r t c comp c imon r adj2 r adj1 r dim2
Satellite Communication - MIT OpenCourseWare
ocw.mit.edus 10 log R C N o EIRP L s L a G r T s 228.6 C N EIRP L s L a G r T s 228.6 10logB RIP E b N o G r T s ... (Land Mobile Radio) Freq at Risk: Int’l & US Commercial encroachment GPS L2: 1227.6 Mhz L1: 1575.42 12GHz Ka. 90 90 0 ... • Spread Spectrum • Narrow beamwidths • On board processing • Nulling antennas.
EN 300 328 - V2.1.1 - Wideband transmission …
www.etsi.orgETSI 2 ETSI EN 300 328 V2.1.1 (2016-11) Reference REN/ERM-TG11-011 Keywords broadband, data, harmonised standard, ISM, LAN, mobile, radio, regulation, spread spectrum,
EN 300 328 - V1.9.1 - Electromagnetic compatibility and ...
www.etsi.orgETSI 2 ETSI EN 300 328 V1.9.1 (2015-02) Reference REN/ERM-TG11-010 Keywords data, ISM, LAN, mobile, radio, regulation, spread spectrum, SRD, testing, transmission, UHF
ZigBee IEEE 802.15.4 PHY Layer - SoC: soc
www-soc.lip6.frDirect Sequence Spread Spectrum 25 (Farahani, ZigBee Wireless Network and Transceiver) N. Beilleauand H. Aboushady Offset QuadraturePhase Shift Keying
Polycom SoundStation2W™ Wireless Analog Conference Phone
www.polycom.com• Digital spread spectrum with frequency hopping • Signal range: 150 ft (45 m) from ... or 2.4 GHz WDCT radio interface to base station • 2.5 mm connection port (cable included) ... (R and TTE Directive) • A-Tick and C-Tick Marks • RoHS Compliant Environmental requirements
A Technical Tutorial on the IEEE 802.11 Protocol
sss-mag.com• Direct Sequence Spread Spectrum in the 2.4 GHz Band, and • InfraRed 802.2 Data Link Layer 802.11 MAC FH DS IR PHY Layer Beyond the standard functionality usually performed by MAC Layers, the 802.11 MAC performs other functions that are typically related to upper layer protocols, such as Fragmentation, Packet Retransmitions,
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