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It has taken many years for wireless engineers to "tame" wireless communications and there are still many complexities in planning wireless networks due to the unpredictable and varying RF environment.
Appeared: Microwave Product Digest Date: April 2006
As wireless signals travel through the medium, they undergo a loss in the signal strength due to signal attenuation caused by the medium and obstacles...
Appeared: Communication News Date: October 2006
As WLAN technology continues to make its presence known across the enterprise, the complexity of wireless communication highlights the need for extensive functionality testing...
Appeared: Processor Magazine Date: August 2005
Perhaps the most trusted and reliable device known to an RF engineer is his spectrum analyzer...
Appeared: Base Station Earth Station Magazine Date: November 2004
Title: GPS Improves TCXO, OCXO and Rb Referenced Products
As the industry leader in field test equipment, Berkeley Varitronics Systems is always looking for better frequency sources to reference and synchronize its products...
Appeared: MPD Magazine Date: June 2004
Title: 802.11a Measurements Techniques and Network Issues Product feature: Yellowjacket
Appeared: MPD Date: November 2003
Title: Intruder Alert! Recognizing WLAN Attacks and Locating the Culprits Product feature: Hornet
Appeared: MPD Date: 2002
There are two types of fading that are relevant to performing coverage measurements, fast fading, also known as Rayleigh fading and terrain based fading due to obstructions and propagation loss...
Appeared: BVS website Date: November 2002
Installing an 802.11b wireless LAN (WLAN) system for a large office setting often requires cellular system engineering techniques and...
Appeared: Communications News Date: May 2002
A sometimes overlooked, but just as important part of the receiver, is the local oscillator used to down convert the received signal, and in particular its phase noise and or spurs present in its output...
Appeared: Microwave Product Digest Date:July 2001
Title: Spread Spectrum Series Part 4
The most critical aspect of a spread spectrum design is synchronization...
Appeared: Microwave Product Digest Date: May 2001
If I had to describe the "tricks" of CDMA in just two words they would be synchronization and correlation...
Appeared: Microwave Product Digest Date: April 2001
Correlators are an important basic building block in CDMA designs. Correlators are used in signal acquisition, tracking and demodulation circuits and occupy a substantial amount of system resources...
Appeared: Microwave Product Digest Date: March 2001
The application of telecommunications is often about 'bandwidth conservation'. The technology of Spread Spectrum is exactly the opposite philosophy. Spread spectrum employs a novel form of modulation in which the RF bandwidth of the signal is much larger than that needed for traditional modulation schemes and the bandwidth is independent of the modulation content...
Appeared: Microwave Product Digest Date: February 2001
IEEE 802.11 has captured the support of major wireless industry leaders. The growth and commercialization seeb by the personal communications sector may be finally spilling over to the wireless LAN sector, but I still remember the cold and stormy night back in 1988 when I started working on a wireless LAN at a start-up...
Appeared: Wireless Week Date: May 2000
Until now, it has been difficult to monitor and measure performance of a base station's receive antenna because it requires disruption of service. A new method of monitoring a base station's receive antenna has been invented. This approach provides uninterrupted service for systems operators and constant unattended monitoring of antennas...
Appeared: Base Station Earth Station Date: March/April 2000
Monitoring the integrity of antenna systems is critical for efficient operation of a remote repeaters, paging or cellular/PCS base stations and is the subject of this article. A new technology approach to this challenge has been invented 1 which provides uninterrupted receive antenna monitoring for base stations...
Appeared: Microwave Product Digest Date: January 2000
Title: New Measurements with CDMA Field Test Equipment
This article presents some of the problems that have been found and diagnosed with pilot scanners.Other potential problems in CDMA networks are addressed,and CDMA Field tools capable of diagnosing these potential problems are introduced.These tools are under development,have capabilities in addition to pilot scanning and are suitable for both real time analysis or post-processing...
Appeared: Microwave Product Digest Date: August,September 1999
Why is data filtering needed? Data must be massaged to provide a clear and concise picture to the network optimizer...
Appeared: BaseStation EarthStation Date: May,June 1999
The deployment of CDMA emphasizes even stronger demand for specific tools to set up new networks and troubleshoot existing ones...
Appeared: Microwave Journal Date: January 1999
Falconeye is the companion software for the Falcon Scanner. It is primarily a high-speed data collection application. The user interface allows the modification of parameters which define the data being retreived... Author: Herb
Petrat
Throughout the world, CDMA telephonics is perceived as great "Yankee ingenuity." This can be appreciated when we look at 3G (Japan and Europe) moving forward with proposed standards for their spin on the next generation of CDMA... Author: Gary
Schober
There is now a stronger case for using the genuine digitally modulated signal as a stimulus. Author: Narasimhan
Doriswamy
The use of CDMA field testing equipment, introduced in Part I, data collected by the equipment in the field and analysis is presented here in Part II. Author: Raymond
Chadwick and W.C. Andrew Groome of TEC Cellular
This paper briefly reviewed some of the techniques currently used to simulate ACP and EVM of nonlinear power amplifiers excited by digitally modulated signals. Author: Narasimhan
Doriswamy
More often than not, coverage surveys made with narrow band transmitters are inadequate to measure digital transmission multipath reflections, pseudo noise (PN) pollution, or other parameters unique to a CDMA wireless network. Author: Rich
Fisher
The author presents a method and system of propagation analysis to measure pilot signals from both neighboring CDMA transmitters and multipath reflections in Ec/Io or signal strength. Author: Raymond
Chadwick
The Eagle series are high speed, mobile field measurement instruments that continuously survey all Cellular or PCS Pilot channel signals and report their power profiles. Author: Gary
Schober
Product Feature: The Super Eagle In order to make a common test instrument suitable for all CDMA systems, the instrument should be programmable or reconfigurable to suit a particular system. Author: Dr.
Nara Doriswamy
Product Feature: The Eagle Multiple CDMA-modulated signals sharing the same RF channel have unique characteristics when signal reflections are encountered...The ability of the Eagle to scan every frame [26.6 msec] of all 512 base stations, and the associated multipaths at each base station, exceeds all existing data collecting tools for CDMA propagation analysis. Author: Gary
Schober
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Product Feature: Duet The authors present a method and system of propagation analysis to measure interference from both neighboring CDMA transmitters and multipath reflections. Author: Ray
Chadwick and Dr. Boris Sheyer
This portable dual-channel unit performs propagation analysis, CW testing, site verification, and signal-strength analysis. Author: Robert
Keenan
Part 2 - Use a sequential-correlating channel-sounder to optimize 2GHz personal communications services (PCS) systems and to overcome the degenerative effects of multipath reflections on signals with digital modulation. Author: James
Bush, Ph.D., and Gary Schober
Part 1 - Multiple Reflections cause more problems with digitally modulated RF signals than with analog-modulated signals. In this installment, flat fading and frequency-selective fading are explained. Author: James
Bush, Ph.D., and Gary Schober |
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