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2001-09-27 QPSK transmitter and receiver system simulation using real-world RF components
This application note is intended to show the effect of using real-world RF components in a simulation in comparison with near-ideal wideband components.
2001-09-27 QPSK transmitter and receiver simulation using ideal components
This application note is intended to show how Elanix's SystemView simulator can be used to simulate QPSK modulation and demodulation in a communication system with ideal components.
2002-04-16 Fujitsu QPSK tuner IC replaces QPSK NIM modules
Positioned as a replacement for discrete QPSK NIM modules, the MB8A15 single-ship QPSK tuner integrates a ZIF tuner, QPSK demodulator, and forward error correction circuitry suitable for DVB-S and DSS transmissions.
2009-09-18 DP-QPSK LN modulator drives 10Gbit/s optical nets
Fujitsu Optical Components Ltd unveiled a DP-QPSK LN modulator with low drive voltage for 100Gbit/s optical networks.
2010-03-24 CMOS ADC handles 127Gbit/s PM-QPSK scheme
Opnext Inc. has developed a low-power quad CMOS ADC, designed for use in a 127Gbit/s Polarization Multiplexed Quadrature Phase Shift Keying (PM-QPSK) modulation scheme.
2003-08-22 Using the CMX980A for Non-TETRA Radio Schemes
This application note discusses some of the theory behind I&Q modulators, and details how the CMX980A could be used with any modulation scheme.
2004-02-16 Uncovering the set-top box
The function of an STB is to decode signals, verify conditional access rights and display multimedia objects on a TV set.
2002-05-17 STMicro satellite demodulator increases bandwidth
STMicroelectronics' STV0499 digital satellite television demodulator that includes QPSK, 8PSSK, and 16QAM mapping and an integrated Turbo coding system, which increases satellite transmission bandwidth by >35 percent
1999-06-29 Power amplifier technologies for emerging air interface standards
This paper describes the state-of-the-art results for power amplifiers for wireless communication applications and indicates the need for improved performance of the system.
2002-11-14 MSK and its application to wireless data transmission
This article describes some insight as to how a simplified MSK modem can be implemented and modeled.
2002-02-16 Improving accuracy in EDGE-based designs
This technical article aims to inform system designers how to make 2.5G wireless systems a reality as it discusses how to access more sophisticated design and test techniques.
2004-10-18 High-speed packet service kick-starts migration to 3G
Peak rates of up to 7Mbps and compatibility with legacy networks make HSDPA a good first step toward 3G cellular.
2003-05-02 High efficiency modulations for satellite TV
Satellite transmission efficiency may be improved as a result of higher definition constellations, coupled with advanced error correcting algorithms.
2004-07-16 Freescale aims radio chips at 2.45GHz band
The company has announced two low-power, 2.45GHz integrated radios--one for proprietary applications, the other with a Zigbee protocol and network stack.
2004-07-01 Evaluating processing options for system-on-chip integration
Decisions in SoC integration has to do with the resources available and how features and bugs will be handled.
2003-08-18 Evaluating challenges of Docsis testing
The business value of having the Docsis stamp of approval on a cable modem termination system or cable modem in today's competitive and rapidly growing market is indisputable.
2004-08-02 Design challenges in next-gen WLAN architectures
Solution providers take diverse roads for WLAN. Success lies in identifying architectural issues that span RF and DSP domains.
2004-11-01 Critical RF measurements in digital TV systems
Focus on factors that compromise the integrity of a transmission system to maintain reliable, high-quality service over DTV.
2003-01-20 Conexant satellite demodulator operates from 0.5W
The single-stream CX24123 QPSK demodulator and FEC decoder supports symbol rates from 1 megasymbols per second (Msps) to 45Msps.
2004-04-01 Boosting efficiency using 802.11a power amps
For 802.11a-based systems to deliver their full performance potential in WLAN-enabled devices, a completely new modem architecture and PA design is required.
2003-03-24 Bookham optical transmitter doubles operating distance
Bookham Technology plc has developed a 20Gbps optical transmitter that uses a DQPSK modulator to double the DWDM spectrum-packing efficiency.
1999-06-29 Advances in satellite front-end technology give speed and cost-benefit system test, installation, and free to air operation
This paper reviews the possibilities of addressing issues of satellite TV through advances in the front-end technology used in a typical digital satellite receiver. The required enhancements are quantified, followed by a description of the design project intended to deliver these enhancements.
2001-05-08 ADSL technology explained: The Physical Layer
Learn about ADSL's multicarrier modulation technique, common impairments and phone-line characteristics.
2004-11-16 Achieve end-to-end QoS for wireless video streaming
Examine an end-to-end solution providing guaranteed video QoS over standards-based 802.11 networks.
2003-12-01 802.11g starts answering WLAN range questions
Chipmakers and equipment developers are starting the initial rollout of 802.11g systems. Now designers can more effectively compare the range of 802.11g and 802.11a systems.
2012-08-27 100Gb/s multiplexer for ultra-long haul apps
Semtech's SMI10022 supports soft-decision forward error correction that claims to offer significant improvement in optical transmission reach for ultra-long-haul and submarine optical links.
2012-03-22 Optical modulator geared for 40G, 100G systems
The GX6255 from GigOptix is an SMT Mach-Zehnder modulator designed for both the 40G RZ-DQPSK and the 100G DP-QPSK metro and long haul transponders.
2005-08-26 DTV demodulator delivers full integration
Micronas rolled out its DRX-H family of multistandard 8VSB/QAM/QPSK/NTSC demodulator products, primarily intended for DTV apps, STBs, multimedia PCs, DVD recorders, PVRs and tuner modules.
2000-05-03 Designing 802.11-compliant digital spread spectrum applications
This paper presents a 802.11-compliant transceiver chipset designed for Digital Spread Spectrum communication in the 2.4GHz ISM band. The chipset utilizes a single conversion architecture to optimize the system performance/cost tradeoff and supports multiple modulation schemes, including BPSK, QPSK, FSK and CCK.
2005-08-23 Demodulator offers high integration, superior performance
Micronas unveiled its DRX-H family of multi-standard 8VSB/QAM/QPSK/NTSC demodulator products targeting applications in digital TV sets, STBs, multimedia PCs, DVD recorders, PVRs and tuner modules.
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