Designing a wireless data network without fully accounting for the mix of applications, the types of client devices and number of users risks reduced performance. By Dr. Roger Skidmore, Motorola click to enlarge Figure 1.
Judicious use of the appropriate protective circuits and devices in cellular base stations can greatly improve reliability and ensure required compliance with YD5098-2005. By Teddy To, China, Littelfuse Inc. click to enlarge Figure 1.
With networks built around an infrastructure of base stations and subscriber stations like WiMAX, the size of the infrastructure and the number of deployments is a key consideration. John Schwartz, Digi International It is always interesting whenever a new standard is adopted or starts to gain some ubiquity in the marketplace.
Lower voltage IC technologies now enable ultrasound receiver chips with unprecedented high gain and low noise numbers. By Ismail Oguzman and Arash Loloee, Texas Instruments click to enlarge Figure 1. Typical block-diagram of a complete medical ultrasound system.
Failure to test base-station or mobile device receivers under realistic conditions can add significant risk in terms of support costs, churn, and operational costs. By Arashk “Ash” Mahjoubi-Amine, Spirent Communications click to enlarge Figure 1.
With the pressure on infrastructure equipment vendors to deliver quickly to market, structured, incremental and flexible test programs are essential for the development integration, verification and optimization of LTE infrastructure. By Phil Medd and Nick Carter of Aeroflex Test Solutions click to enlarge Figure 1.
By Benjamin Zarlingo, Agilent Technologies Inc. In designing, troubleshooting and optimizing WiMAX Wave 2 systems, a variety of dual-channel measurements can provide essential insight into their operation and performance. click to enlarge Table 1.
Securing product performance in the field by using laboratory channel emulation can give a competitive edge to companies that use these solutions. By Janne Kolu, Elektrobit Corporation click to enlarge Figure 1. Emulation of a radio channel in the laborotary conditions.
Diverse modulation formats and sampling rates between various standards make designing common building blocks challenging. Deepak Boppana, Altera Corporation click to enlarge Figure 1. Farrow Filter Structure. Remote radio heads (RRH) technology with support for simultaneous operation of multiple air-interface protocols is an emerging product requirement for operators.
With the integration of MEMS technology in the remote, motion signatures can be digitized for the game control. By Michelle Kelsey, Freescale Semiconductor The evolution of gaming is on its way - Freescale's accelerometer, MCU and radio portfolio enables an ideal chip set for low power with high integration.
It's in the Tag: The Importance of Considering Power Efficiency when Choosing a Real Time Location SystemMay 27, 2009 7:31 am | Articles | Comments
For a location system to deliver a return-on-investment, a critical mass of assets must be tagged for tracking. By Steve Jackson, RadarFind Corporation Figure 1. Status switches on RTLS tags. While more organizations are realizing the value of investing in a real time location system, demonstrating the return-on-investment is critical to garner broad support.
By considering packaging in the early stages of product development, design teams can determine the best architecture for their particular application. By Ralph Ebbutt, Maxtek Components Corp. click to enlarge Figure 1 - An example of a system-on-chip (SoC) device.
Using advanced battery technologies to unlock the dynamic growth potential of remote wireless sensors used in "smart infrastructure" and related applications. By Sol Jacobs, Tadiran Batteries Contrary to all the recent economic news, the February 17, 2009 edition of The Wall Street Journal contained an upbeat article by Michael Totty entitled "Smart Roads.
By Todd Mersch, Continuous Computing So here we are in the second half of 2008 why are femtocells not more widely deployed in our homes? When are we finally going to get five bars in the family room? And what’s keeping us from quicker YouTube downloads in our kitchens? click to enlarge Figure 1.
The introduction of new radio technoloiges, like OFDM and MIMO, in LTE and WiMAX systems has created the need for new types of test equipment. George Reed, Azimuth Systems click to enlarge Figure 1. Three methods of testing transmitter and receiver performance: lab-based, direct cable connectivity, over-the-air testing and lab-based, connection through a channel emulator that simulates real world conditions.
By Danny Tseng, Cypress Semiconductor Designing a platform with modularity in mind is one approach that can shorten design time as well as enable easier feature upgrades. click to enlarge Figure 1. Architecture modularization of a mobile handset.
The recent advent of low-cost FPGAs equipped with high-performance transceivers and DSP blocks will greatly reduce the build and deployment costs of a video broadcast system. By Shakeel Peera, Lattice Semiconductor Corporation click to enlarge Figure 1.
Grounding and care in layout is the key to keeping noise out of the control circuit and allowing correct operation. Grounding and care in layout is the key to keeping noise out of the control circuit and allowing correct operation. By John Bottrill, Texas Instruments click to enlarge Figure 1.
A receiver's position accuracy is a fundamental challenge of satellite navigation system. As a result, GPS receiver designers must perform a combination of measurements to ensure the device will perform as expected. David A. Hall, National Instruments Geocaching involves discovering various "caches" whose coordinates can be found on the Web and whose contents are located all over the world.
Protecting infotainment dynamic data is essential. The unique advantage of F-RAM guarantees higher availability & performance. By Duncan Bennett, Ramtron International The use of non-volatile ferroelectric RAM (F-RAM) in automotive applications began with airbag applications. This type of safety critical application was click to enlarge Figure 1.
This is part two of a three part series. Read part one By Dr. Michael D. Foegelle, ETS-Lindgren; Kevin Li, Nokia Corp.; Andrew Pavacic, Paul Moller, Motorola, Inc. Defining the Grip An informal survey of advertised handsets on the market revealed that they could generally be separated into two categories by width.
A new modeling methodology combines FPGAs and detailed circuit-level modeling in a design-to-test flow. By Greg Jue and David Leiss, Agilent Technologies click to enlarge Figure 1. This high-level design flow begins with the design of key algorithms which can be quickly evaluated in simulation to verify system performance with just a handful of simulation blocks.
Emulating the way that the human hearing system characterizes and groups the audio stream into sound sources proves to be an extremely efficient and accurate way to suppress both stationary and non-stationary noise. By Lloyd Watts, Founder and CTO, Audience click to enlarge Figure 1a.
A standardized hand phantom used together with the SAM head phantom for radiated performance testing mirrors real-world use. Dr. Michael D. Foegelle, ETS-Lindgren, Kevin Li, Nokia Corp., Andrew Pavacic and Paul Moller, Motorola, Inc. Figure 1. The resulting kinematic CAD model.
As wireless standards continue to evolve, software-defined ?test systems will continue to evolve with them. By Luke Schreier, National Instruments As the proliferation of wireless standards continues, the idea of using software-defined measurement capability has become a necessity as opposed to a matter of click to enlarge Figure 1.