Using picocells to build high-throughput 802.11 networks
Jul 1, 2004
By Gregory Davi In a typical indoor 802.11 wireless network, a single access point can cover
2500 to 10,000 square feet. Picocells are substantially smaller RF coverage
areas and are used to provide high data throughput for dense wireless
terminals/appliances by minimizing the amount of bandwidth that is shared
among wireless users....
Rf Front-End Considerations for Sdr Ultra-Wideband Communications Systems
Jul 1, 2004
By Stéphane Paquelet, Christophe Moy and Louis-Marie Aubert Design an efficient RF front-end for a novel impulse radio signal transmission
with a detection scheme of an ultra-wideband software-defined radio with high
data rate demodulation structure....
Products
Jul 1, 2004
Test and Measurement Wireless communications analyzers Tektronix, Inc. has added High Speed Downlink Packet Access (HSDPA) test capability to its series...
Amplifiers
Jul 1, 2004
Current feedback amplifier National Semiconductor Corporation has launched three high-speed LMH amplifiers intended for portable communications and video...
WJ Communications completes acquisition of EiC
Jul 1, 2004
WJ Communications, manufacturer of RF semiconductor and multichip modules (MCMs), has completed its previously announced acquisition of the infrastructure...
Slowly, but steadily, MEMS permeates RF spectrum
Jul 1, 2004
Ashok Bindra, Editorial Director For nearly two decades now, micro-electromechanical systems (MEMS)-based devices like acceleration sensors have been effectively serving the automotive...
IEEE approves 802.3ah standard
Jul 1, 2004
The IEEE standards board has unanimously ratifed the 802.3ah standard. This announcement came from the Ethernet in the First Mile Alliance (EFMA) during...
Pierce-gate oscillator crystal load calculation
Jul 1, 2004
By Ramon Cerda The Pierce-gate oscillator is well recognized by most designers, but few understand how to specify the crystal correctly. The crystal used can be either a fundamental AT-CUT or BT-CUT. A BT-CUT crystal has poor frequency stability over temperature compared to an AT-CUT. This topology uses a parallel crystal and not a series crystal....
WiMAX could be next step after WiFi
Jul 1, 2004
As the WiMAX forum gathers more members and the technology gears up to begin certification and interoperability testing later in the year in conformance...
Emerging wireless standard ZigBee gains more support
Jul 1, 2004
Airbee Wireless and Link Plus Corp., two Washington-area companies, have announced a strategic partnership for co-developing a series of new products...
Fast Rayleigh Fading Simulation with an IIR Filter and Polyphase Interpolation
Jul 1, 2004
By Christos Komninakis and Joel F. Kirshman This simulator efficiently generates correlated complex Gaussian variates with a
U-shaped power spectral density. It consists of a fixed IIR filter followed by a
variable polyphase interpolator, to accommodate different Doppler rates
specified by the user. The complex Rayleigh fading simulator is implemented as
a model in the Visual System Simulator....
Multiband receiver board supports 1,280 channels
Jun 1, 2004
VME board supplier Pentek Inc. has announced its first entry into the cPCI market with a 3U 16-channel multiband-receiver board and a 6U 32-channel multiband-receiver...
Products
Jun 1, 2004
Signal Sources 5 GHz VCOs Crystek Crystals Corporation has expanded its line of voltage-controlled oscillators (VCOs) with a 5 GHz model in a 0.5 inch...
Building radio towers for reliable and secure communications
Jun 1, 2004
Ashok Bindra, Editorial Director From police vehicles on the road to ambulances attending the sick, radio communications has played a vital role for decades in protecting citizens and...
WiFi/Bluetooth
Jun 1, 2004
LDMOS amplifier California Eastern Laboratories has introduced the UPD5702TU, NEC's new LDMOS medium-power amplifier. Housed in an 8-pin 2.0 2.2 mm package,...
Unique RF front end allows high TOI
Jun 1, 2004
By Roy Keeney and Eiji Mori Signal analyzers are the instruments of choice for characterizing and measuring today's complex digitally modulated signals. Many required measurements...
New signature model redefines high-end analyzers
Jun 1, 2004
Anritsu Corp.'s U.S. subsidiary Anritsu Co. has made its foray into the high-performance signal analyzer market with the introduction of a new Signature...
The importance of Fast, Economical Testing for RFIC PAs, Mobile Phones
Jun 1, 2004
By Robert Green and Jerry Janesch Testing of RFIC power amplifier and mobile phone handsets are approaching
10 percent of per-unit cost. Minimizing test time by combining today’s intelligent
instruments, manufacturers can significantly increase testing throughput, thus
garnering a substantial competitive advantage....
Patriot granted Hispasat type-approvals
Jun 1, 2004
Hispasat, the Spain-based satellite communications operator, has type-approved three of Patriot's Ku-band antennas for use with its satellites. These...
Steering safer wheels for America's motorists
Jun 1, 2004
By Tejas Desai, Ken Chance and Takashi (Ted) Ozawa Driven by vehicle safety regulations and customer demand, tire pressure
monitoring systems continue to evolve. With this need, innovative solutions
are being developed to overcome RF and battery design challenges to
cost-effectively provide the best tire safety system functions....
