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... |
Single-chip, multimode WEDGE RF transceiver for 3G handsets
Sequoia Communications has combined its polar architecture with 0.18 micron silicon germanium (SiGe) biCMOS process technology to create what it claims is the first true multimode transceiver using a common basic architecture across all modes....
RF MEMS in mobile phones
The need for multiband, multimode band switching at low insertion loss while maintaining excellent linearity in mobile phones is driving the need for RF MEMS-based switches. Since this switching problem gets even more acute as new complex waveforms, such as WiMAX are added to this mix, this article looks at the current state of development in RF MEMS switches and discusses its impact on 3G cellular phones....
Security Considerations for WiMAX-based Converged Network
With WiMAX promising to solve the bandwidth bottleneck, many carriers are looking to networking OEMs to provide robust security solutions - particularly VPNs and firewalls - in their edge devices, allowing them to securely deliver feature-rich services to subscribers, while protecting their own networks. Software original design manufacturers are now entering the fray to ensure that device vendors can provide carriers with these next-generation converged platforms, while adhering to the strict certification processes and rigid standards of quality in shorter development cycles....
Low-power receiver architecture for interference-robust UWB radio
Ultra-wideband (UWB) wireless communication promises unprecedented levels of seamless connectivity between consumer electronics devices, enabling gigabytes of data to be transmitted in seconds rather than hours without exhausting the batteries of hand-held devices. To meet the low-cost requirement of consumer product applications, the multiband-orthogonal frequency-division multiplexing system has been designed to minimize transceiver architecture complexity....
Is UWB moving toward standardization?
Despite hurdles, the ultra-wideband UWB standardization process continues with supporters from both factions Multiband OFDM Alliance MBOA...
Direct-conversion Bluetooth receivers
Direct-conversion receivers have well-known challenges that are difficult to overcome such as dc offset. Due to the large modulation bandwidth, the effect of frequency offsets is negligible on the overall performance of the direct conversion receiver as implemented in Bluetooth....
Implementing ZigBee wireless mesh networking
ZigBee offers unique advantages for wireless applications. But with a technology this new, realizing a successful ZigBee implementation requires understanding its architecture and operation, assessing design options at the chip and module level, and weighing practical considerations relative to specific application needs....
Design considerations for an ultra-compact GSM radio solution
The design of modern, cellular handsets places even more stringent requirements on the transceiver portion. Although the radio part of the handset is divorced from the user interface by sophisticated software, it is nonetheless absolutely essential to the satisfactory operation of the handset....
Measuring single-tone desensitization for CDMA receivers
This article sheds light on two important contributors to single-tone desensitization in CDMA receivers; namely reciprocal mixing and cross-modulation. It also presents a practical low-cost method for measuring single-tone desensitization performance in a CDMA receiver....
DVB-H architecture for mobile communications systems
The availability of new low-power, small form-factor digital video broadcast hand-held (DVB-H) demodulator and silicon tuner solutions now enable the reception of digital TV signals on hand-held devices where small displays and limited battery power are a fact of life. The requirement for improved video display functionality and support for multimedia applications makes DVB-H an attractive complementary technology to existing 3G in-band solutions....
Designing wireless interfaces for patient monitoring equipment
Recent advances in wireless technologies now make it possible to free patients from their equipment, allowing greater freedom and even making possible monitoring by their health provider while the patient is on the go....
Direct digitization using superconducting data converters
Direct digitization is the ultimate enabler for future wireless communications. It refers to the ability to bring the digital domain as close to the antenna as possible, on both the receive and transmit ends of the radio transceiver system. It's a goal that remains just out of reach for systems based on traditional semiconductor technology and conventional data converters. Through the use of superconducting microelectronics technology and new, high-performing analogto-digital and digital-to-analog converters, however, direct digitization is firmly in reach....
Why tiny sensors with single-chip wireless platforms are flourishing
A miniature, integrated radio-sensor network in a cube less than 1-inch square is a technology whose time has come. It is essential to understand the special requirements imposed on RF devices operating on a tiny silicon die....
CDMA2000 Design and Performance Requirements
Various heterodyne solutions have continued to flourish through incarnations of transceiver designs, each generation adding new control loops or components to improve the architectures. While communications standards such as CDMA2000 provide challenging performance requirements, the trends are for deep cost reduction, highly integrated solutions and flexibility....
Direct modulation radio hardware architectures for 3G communications systems
The base station transceiver system is one of the most expensive network elements in the wireless network infrastructure and directly impacts the cost of the overall network design and deployment. The requirement for increased capacity and higher data rates will inevitably lead to increased cell deployments. To maintain costs at an acceptable level, telecommunications equipment manufacturers will continue to seek more cost-effective solutions to their infrastructure hardware....
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