Incremental Improvements Define The 2012 Mobile World Congress |
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Louis E. Frenzel, Editor in Chief
The usual players all showed up at this year’s Mobile World Congress in Barcelona with lots of improved devices, but no real game-changing breakthroughs... |
Direct-sequence UWB signal generation and measurement
This article discusses how to generate and measure ultra-wideband signals to design and test the performance of radio receivers handling UWB signals. A number of novel techniques, such as pulse shape recovery and frequency measurements on sub-nanosecond pulses, are described using modern test equipment....
Designing a ZigBee-ready IEEE 802.15.4-compliant radio transceiver
Besides highlighting the physical (PHY) and MAC layers of the IEEE 802.15.4 standard, and the network, security and application layers of the ZigBee wireless technology, this article focuses on efficient implementation of IEEE 802.15.4-compliant radio-on-a-chip by identifying potential low-power features in the standard, suitable transceiver architectures and considering standard CMOS design issues....
Comparing windows for multitone suppression
Harmonic interference suppression requires windows with fast decaying sidelobes. When the requirement is to keep peak sidelobes low, Harris windows are preferred; but when the mainlobes are to be of minimum widths, the recently published Kulkarni windows offer a good choice....
Power supply and ground design for WiFi transceiver
A solid RF layout requires careful planning of board stack-up, power supply routing, supply bypassing, and grounding. These techniques, along with correct placement of filter components, can address PLL spurs as demonstrated by an IEEE-902.11a/g transceiver reference design....
Using field-programmable analog to build adaptable RFID readers
Typical radio frequency identification reader design challenges include multistandard adoption, installation issues, high tag failure rate, and...
Bluetooth and WiFi integration: Solving co-existence challenges
As popular wireless technologies like Bluetooth and WiFi are being integrated on common semiconductor substrates and printed circuit boards, this article looks at a number of system challenges that must be overcome to ensure proper interoperability with co-located Bluetooth and WiFi functionalities....
A miniature reader/active tag streamlines supply chain management
This article describes the design of the proposed mini-RAT's hardware to enable implementation of a nesting architecture....
Ultra-wideband as a Short-Range, Ultra-High-Speed Wireless Communications Technology
Ultra-wideband technologies have been proposed to provide ultra-high speed data rates for short-range communications. In the United States, the systems have been approved for use in the frequency band 3.1 GHz to 10.6 GHz. It supports bit rate greater than 100 Mbps within a 10-meter radius. UWB communications coexist with other wireless networking standards such as 802.11 LAN, 802.16 MAN and WAN....
Facing the Challenges in Building a Next-Generation Transmission Network
In recent years, the mobile industry has faced a serious downturn. Excessive cost of 3G licenses in Europe and unrealistic expectations of the industry...
Using picocells to build high-throughput 802.11 networks
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....
Fast Rayleigh Fading Simulation with an IIR Filter and Polyphase Interpolation
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....
Extending Benefits of 3-D Integration to Next-Generation Wireless Devices
Three-dimensional integration provides a methodology to address many of the concerns confronting RF designers. Advances in 3-D can be extended to the RF front to integrate RF, analog and digital functions in miniature IC packages and overcome the roadblocks presented by process technology....
Unique RF front end allows high TOI
Signal analyzers are the instruments of choice for characterizing and measuring today's complex digitally modulated signals. Many required measurements...
Versatile signal source analyzer performs multiple tests
From simple crystal oscillators to YIG-tuned resonators and frequency synthesizers, RF and microwave signal sources require an extensive battery of tests...
IEEE 802.11 Spectral Measurements Using Vector Signal Analyzers
The vector signal analyzer is fast becoming the instrument of choice for RF designers working on advanced digital communications systems. They can perform many of the same measurement and characterization tasks as the spectrum analyzer, with the added ability to perform many useful digital demodulation functions....
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