By Chris Desalvo, Agilent Technologies Commercially available RF transmitters in the ever-evolving wireless communications technology give SIGINT and COMINT mission managers a most difficult task. They need to detect traditional push-to-talk signals, wideband digital communications, and always be thinking of future threats.
Wireless systems are now fully mainstream in our lives, not only in the consumer world of cell phones, Wi-Fi enabled laptops and satellite television, but also in the mission and life critical world of aerospace and defense. Recent applications such as ADS-B (Automatic Dependant Surveillance - Broadcast) managed commercial airline flight, software defined radios, and UAVs (unmanned aerial vehicles) bristling with sensors, all depend heavily on the electromagnetic spectrum to interact with the world, demand the highest in reliability, and are driving new and innovative solutions relative to electrical interconnect.
Mukesh Kumar, Texas Instruments The military electronics industry, which includes mission critical products, has always had quality as its ultimate objective. It was a widely held belief that the military’s computers, communications systems and all things electronic had to be a step or two ahead of everyone else’s systems.
Simon Whittle, Nujira Ltd. The new generation of data-oriented digital communications networks being rolled out in the cellular, broadcast, military and other environments carries a sting in the tail for RF designers. In order to achieve high data rates, these new standards use advanced modulation techniques such as OFDM which significantly increase the variations in amplitude of the transmitted signal.
To overcome the ever increasing end-user performance requirements of mobile devices, new multi antenna devices are being developed utilizing the recent advances in Multiple-Input Multiple-Output (MIMO) techniques, such as transmit diversity and spatial multiplexing introduced e.g. in IEEE802.16 standard.
By Graham Celine, Azimuth Systems The marketing battle between WiMAX and LTE is raging in an effort to declare which is the best solution, and vendors and service providers are racing to put stakes in the ground to claim the first or most predominant network delivering wireline speeds. However, the true challenge still lurks in the background and has yet to raise its head: which technology will work better, which will provide more throughput, which will offer better range and which will deliver more flexible mobility? The ability to put each of these technologies through their paces and comprehensively test and benchmark the performance of the network is pivotal to the success of either technology’s rollout.
Evergreen Solar, Inc., a manufacturer of String Ribbon™ solar panels with its proprietary silicon wafer technology, recently unveiled its upcoming line of higher efficiency solar panels featuring its newly developed BOOST™ Cell Technology, at Intersolar 2010 in Munich, Germany. The new ES-D and ES-E series of panels for residential and commercial markets feature Evergreen’s new Boost cell technology that uses micro wires instead of conventional bus-bars to reduce cell shading, improve current collection and ultimately increase the overall panel efficiency.
Siemens Energy and Prysmian Powerlink will connect two North Sea offshore wind farms to the German grid using a high voltage direct current (HVDC) link for transpower. The order awarded to the BorWin2 consortium is worth more than €500 millio. The Veja Mate and Global Tech 1 offshore wind farms, which will have a combined power generating capacity of 800 MW, will be connected to the grid via a submarine cable link carrying HVDC.
National Semiconductor Corp. recently announced that it has reached new deals related to its SolarMagic technology with Green Energy Solar (GESolar) and QC Solar. SolarMagic monitors and maximizes the energy harvest of each individual PV panel through a combination of advanced algorithms and leading-edge mixed-signal technology.
Following a record-breaking year of capacity additions in 2009 - with 9.8 GW of wind projects installed - the US wind market finds itself confronting a growth-constrained 2010 and a near-term market landscape wrought with increased competition, according to a new market study, US Wind Power Markets and Strategies: 2010-2025 from IHS Emerging Energy Research.
WASHINGTON- The U.S. Environmental Protection Agency (EPA) is recognizing three universities with the Combined Heat and Power (CHP) awards for generating power and thermal energy while saving energy, lowering greenhouse gas emissions and decreasing air pollution, which can reduce impacts on the public’s health.
Washington, D.C., -- A new energy bill introduced by Sen. Richard Lugar (R-Ind) wisely uses energy efficiency as the core of its provisions, the Alliance to Save Energy said today. The Lugar Practical Energy and Climate Plan focuses on money-saving efficiency policies designed to create long-term energy savings for cars and trucks, new buildings and appliances, existing homes and commercial buildings and industry.
DEVENS, Mass.,(BUSINESS WIRE) -- American Superconductor Corporation, a global power technologies company, announces in conjunction with Global Wind Day 2010 that it has achieved a significant milestone by supporting the production of more than 15,000 megawatts (MW) of wind power worldwide with its proprietary power electronic solutions.
By Ray Chadwick, Berkeley Varitronics Systems, Inc. WiMAX signals suffer from the effects of multipath and exhibit broadband fading characteristics that are very apparent in the spectrum of the received WiMAX signal (see Figure 1). It’s not a trick; OFDM modulation does not eliminate fading and is not always received with a flat spectrum.
By Keith Anderson, Agilent Technologies click to enlarge Figure 1. NVNA block diagram. High-power RF amplifiers are used in telecommunications, biomedical, and military systems. With output power levels ranging up to 1kW, these amplifiers are typically designed to operate near or into compression in order to provide the maximum output power possible.
The Emergence of JESD204A in Data Converters and Low Power FPGAs in Wireless Infrastructure EquipmentApril 14, 2010 12:12 pm | Articles | Comments
The increasing data throughput demands on base stations have led to increased radio unit component cost and power, with associated printed circuit board and interface complexities, as well as heightened signal integrity concerns.
By Brian Blum, Texas Instruments Bluetooth Low Energy (BLE) is fast-becoming the hottest buzz-word in low-power wireless communications. Within five years, we have seen a variety of standard and proprietary networking protocols emerge, begin to show promise, and occasionally open up new market spaces and fundamental opportunities for technical innovation.
By Michele Kinman, Energy Harvesting Forum click to enlarge Energy harvesting is the process of capturing and accumulating byproduct energy as the energy becomes available, storing the energy for a period of time and conditioning it into a form that can be used later such as operating a microprocessor with in its limits.
By Mike Woodward, Communications Industry Marketing Manager, The MathWorks click to enlarge Figure 1. Silo development methodology. The use of silo-based methods in wireless systems design often introduces problems in the development process.
By Dennis Brestovansky, president and CEO of Aveso Displays A new world of printed electronic display technology is evolving, offering unlimited opportunities for mass consumer and industrial applications. New flexible, printed displays are increasingly being integrated into a variety of everyday products including credit cards, product packaging, home-health diagnostics and even in apparel to combat theft and counterfeit.
By Keith Adkins and Jackie Johnson, RF Micro Devices In the last decade mobile device users have seen unprecedented changes in technology. These changes have brought more functionality and lower cost to the overall handset market. Users are demanding more and more functionality in mobile devices, which comes at the cost of talk time.
By Ram Asokan, Ixia SC-FDMA is a new technology used for uplink in LTE. This article explores this technology, its use in LTE and its extension from OFDM.
Developing the LTE uplink, especially the receiver for the base station, requires complex design approaches and a significant capability in test systems. By Tim Fowler, Cambridge Consultants Ltd. click to enlarge Figure 1. Functional test equipment.
There is great potential for ‘greater femtocells' to improve mobile coverage and capacity outside the home environment. By Rupert Baines, picoChip, Inc. Femtocells are now a commercial reality. Launches by AT&T and Vodafone, amongst others, have brought femtocells into the consumer sphere.
By Josh Carnes, National Semiconductor Corporation click to enlarge Figure 1. Block diagram of an IF sampling subsystem within a communications receiver. Cutting-edge 16-bit, high-speed analog-to-digital converters (ADC) can offer the very high dynamic range and low distortion levels required to meet today's most demanding wireless communications standards.