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Single Carrier FDMA in LTE

February 11, 2010 10:21 am | Articles | Comments

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.

Challenges in Designing a New Modulation Scheme for LTE

February 8, 2010 7:30 am | Articles | Comments

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.

More than Residential: Femtocell Deployment Beyond the Home

February 8, 2010 7:30 am | Articles | Comments

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.

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Wireless Basestation Design Challenges Using High-Speed, 16-bit ADCs

February 8, 2010 7:30 am | Articles | Comments

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.

Next Generation Wireless IP Networking Applications

February 8, 2010 7:30 am | Articles | Comments

IPSec's growing importance in ensuring security and reliability in new networks By Asaf Shen, Discretix Inc. Internet Protocol Security (IPSec) provides security at the network layer of the protocol stack. By using IPSec, protection is offered to all IP packets regardless of the protocols and applications running in the upper layers of the protocol stack.

LTE Femtocell Roadmap from Concept to Reality

February 8, 2010 7:30 am | Articles | Comments

The LTE femtocell stands to serve as a key weapon in the mobile operator arsenal. By Todd Mersch, Continuous Computing click to enlarge Figure 1. Putting the puzzle together, integrated LTE femtocell silicon. The market is buzzing about the critical role of "small cells" in Long Term Evolution (LTE) deployments – femtocells, picocells and microcells.

Network Operator Acceptance Testing of LTE Devices

February 8, 2010 7:29 am | Articles | Comments

The (new/old) challenges in accelerating LTE device time-to-market. By Konstantinos Stavropoulos, Anite click to enlarge Figure 1. A representative set of lab acceptance tests that 2G/3G operators have considered. The use of wireless devices, whether handsets or data cards, has increased substantially during the last few years.

Building an FPGA-based SoC Framework for LTE Baseband Designs

February 8, 2010 7:28 am | Articles | Comments

By Akshaya Trivedi, Altera Corporation Figure 1. SoC framework and infrastructure. Radio Access Networks (RANs) are undergoing an architecture change to an all-IP flat network to reduce network deployment costs as well as to offer rich mobile applications and services at a lower end-to-end latency.

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Transmitter RFIC Integration for Next Generation Wireless Infrastructure Radios

February 8, 2010 7:28 am | Articles | Comments

Leveraging highly integrated RFIC designs and high dynamic range converters helps meet the challenges of next-generation base stations. By Phillip Halford and Ed Balboni, RF Group, Analog Devices, Inc. click to enlarge Figure 1.

LTE: The Insatiable Need for Bandwidth Drives Architectural Change

February 2, 2010 10:14 am | Articles | Comments

By Manuel Uhm and Mark Quartermain, Xilinx The baseband processing function represents a key area of product differentiation for Telecommunications Equipment Manufacturers (TEMs). However, the advent of 3.9/4G systems poses a difficult challenge to TEMs, as they struggle to evolve traditional DSP-centric channel cards to meet a new set of technical and commercial challenges.

Wireless Base Stations Benefit from Signal Compression

February 2, 2010 6:17 am | Articles | Comments

For deployments by a single operator, wireless repeater systems offer more cost effective fiber transport costs. By Allan Evans, VP of Marketing, Samplify Systems ABI Research predicts that revenues for distributed antenna systems and in-building wireless systems will exceed $15B by 2013.

Designing a Wireless Heart Rate Monitor with Remote Data Logging

January 7, 2010 10:58 am | Articles | Comments

The current generation of monitors are portable heart rate sensors that have found their way into general purposes for activities such as exercise and sports. While these devices are useful for individual purposes, they do not facilitate use by a coach or manager. By Archana Yarlagadda, Cypress Semiconductor click to enlarge Figure 1.

Wireless Sensor Networks Expand the Reach of Wireless Technology

December 18, 2009 10:55 am | Articles | Comments

Want to learn more about how design engineers are addressing the challenges of Wireless Sensor Networks? Read on! By Nicholas Butler, Wireless Sensor Networks, National Instruments click to enlarge Figure 1. Technology adoption lifecycle from Crossing the Chasm, Geoffrey A.

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MIMO-Analysis for WiMAX, WLAN and LTE

December 14, 2009 11:48 am | Articles | Comments

Making measurements involving MIMO applications requires adaptation of the algorithms used in the analysis software. By Johan Nilsson and Dr. Wolfgang Wendler, Rohde & Schwarz click to enlarge Figure 1. MIMO in WiMAX system. Due to ongoing growth in demand for channel capacity, more and more radio standards such as WiMAX, 3GPP HSPA, 3GPP LTE and WLAN are adopting MIMO technology.

Integration and Power Management Open the Door for RKE Applications

December 14, 2009 11:48 am | Articles | Comments

ASSPs are meeting the challenges through the integration of mixed-signal technology and innovative power management schemes. Herve Branquart, Robert Waterman, ON Semiconductor click to enlarge Figure 1: Two way RKE block diagram Wireless transceiver technology is truly established in the automotive industry with Remote Keyless Entry (RKE) now a standard feature of even basic specification vehicles.

Model-Based Design for Hybrid Electric Vehicle Systems

December 14, 2009 11:48 am | Articles | Comments

Hybrid Electric Vehicle (HEV) development requires collaboration and optimization across multiple engineering domains. By Saurabh Mahapatra, The MathWorks Figure 1: This simplified diagram of an HEV vehicle illustrates one possible arrangement of system elements.

The Role of Wideband Transceiver Technology in Enabling LTE

December 14, 2009 11:47 am | Articles | Comments

An integrated single-chip RF transceiver provides the flexibility to address all aspects of the LTE standard. By Ebrahim Bushehri, Lime Microsystems click to enlarge Table 1: Comparison of data rate and channel bandwidth for wireless standards.

Introduction to LTE Base Station RF Conformance Testing

December 14, 2009 11:47 am | Articles | Comments

By Moray Rumney and Hiroshi Yanagawa, Agilent Technologies, Inc. Operator acceptance testing is yet another step in the process and includes more user-centric tests. click to enlarge Table 1. Base station RF transmitter characteristics tests.

The Hidden Challenge of MIMO Test

October 15, 2009 11:08 am | Articles | Comments

Today, engineers can combine modern RF signal analyzers with a basic understanding of digital downconversion to produce a tightly synchronized MIMO measurement solution. By David A. Hall, National Instruments click to enlarge Figure 1.

Build Agility through Wireless Networks Designed Right

October 15, 2009 9:33 am | Articles | Comments

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.

Protecting Chinese 3G Base Stations

October 15, 2009 9:02 am | Articles | Comments

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.

WiMAX 101 The Evolution of WiMAX

October 14, 2009 9:18 am | Articles | Comments

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.

State-of-the-Art IC: Transmitter in Ultrasound Devices

October 14, 2009 9:18 am | Articles | Comments

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.

Bringing the Real World into the Lab for 4G Wireless Testing

October 2, 2009 8:51 am | Articles | Comments

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.

Challenges of LTE Basestation and Handset Testing

August 13, 2009 7:18 am | Articles | Comments

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.

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