Embedded.com Tech Focus Newsletter (3-15-10): Building a better wireless networking infrastructure - Embedded.com

Embedded.com Tech Focus Newsletter (3-15-10): Building a better wireless networking infrastructure




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In the last several years we have seen the merging of two significanttechnology trends – data networking based on the mature andwell-understood wired network's Internet Protocol, and a sophisticatedset of wireless technologies focused on making voice and videocommunications more mobile.

The result of this convergence is the current merged data/voicewireless infrastructure where data rates and signal integrity oftenrival that of the wired networks. But just as in nature, where theresult of the merger of two steady states results not in another steadystate but in an initial period of chaos, so too in the newly convergedwireless voice/data network infrastructure, where a grab bag of new andold protocols and standards are competing for survival.

This challenging environment has provided developers withopportunities to come up with new ways of thinking about old techniquesand/or to develop new solutions to new problems. The most recentexample of this kind of innovative thinking is my Editor's Top Pick this week: Building bettermemory management for high performance wired/wireless networks .” In this two part series, Khaled Elsayed and Mohamed Galal describe amore efficient variable-sized memory pools management scheme fit forembedded processing of high-speed packet-based systems found in many oftoday's LTE and WiMAX protocol-based wireless networks.

But they are not alone in the imaginative ways they have found toadapt to this new ubiquitously connected computing environment. Some ofmy favorites have included: how touse SerDes in the 4G wireless infrastructure , using direct conversion receiver designsfor multi-standard/ multiband operation, more effective turboencoder algorithms for femtocell designs , howmulticores can transform IP-based wireless networking, doing complexmatrix inversion for LTE and WiMax, use of asupplemental UMTS/HSPDA protocols to increase wireless data speed ,and usingsignal compression to migrate designs to a 4G wireless infrastructure.I hope you enjoy reading these and the other articles included in thisnewsletter. (Embedded.com editorBernard Cole, bccole@acm.org )

P.S. – The deadlineto submit abstractsfor ESC Boston is upon us . Youhave until today tosubmit an abstract for the technical program at that show, to be heldSeptember 20-23, 2010 at the HynesConvention Center Boston, Massachusetts. Here's thelink to see the tracks and submit an abstract.

  EDITOR'S TOP PICK by Bernard Cole, Embedded.com Editor
Building better memory management for high performance wired/wireless networks
The authors describe a variable pool memory management scheme that has been implemented for LTE and WiMAX protocol stacks and has exhibited excellent performance, especially when compared to traditional fixed-pool implementations.
Using SerDes in Fourth Generation Wireless Infrastructure
As the network equipment infrastructure is built up for 4G there will be an demand for high serial data rates between the main control radio equipment and that in distributed base stations. Here is how to meet the high serial data rate by only ugrading the Serdes through the use of a discrete solution
Direct conversion receiver designs enable multi-standard/multi-band operation
This article discusses the performance and merits of a direct conversion receiver signal chain in the context of 3G and 4G wireless cellular applications.
Turbo encoders boost efficiency of a femtocell's DSP
With an efficient turbo-encoder algorithm, a multichannel 14.4-Mbps femtocell base station can be done on a single digital signal processor.
Multicores can transform IP-based wired/wireless networking
Here's how to overcome typical design complexities in multicore networking.
PRODUCT HOW-TO: Complex matrix inversion on the StarCore SC3850 DSP
Complex matrix inversion is used in LTE, WiMAX, and other communication applications. Here's how to do efficient 4×4 complex matrix inversion on the StarCore SC3850. Source code and a MATLAB reference model are included.
Use a supplemental UMTS/HSDPA network architecture to increase data speed & bandwidth
This article proposes a supplemental UMTS/ HSDPA network architecture that cost-effectively improves service by increasing isolation to reduce interference, while increasing data speed bandwidth and coverage.
Multimode wireless and SDR success llies in software optimization
While the advent of parallel processing architectures is a big step toward realizing the goal of seamless, intelligent connectivity among the various 3G and 4G wireless standards, the potential show stopper is the software. However, some companies are making progress when it comes to optimizing the software of programmable radios so hardware and software can work together in harmony. Find out who!
  DESIGN ARTICLES: Wireless Infrastructure Challenges
The path to a future of wireless communications is paved for TDD
Despite some lingering complexity in the market over which wireless standard will next prevail and when, it is very clear that Time Division Duplex (TDD) is one of the most flexible schemes to meet the highly asymmetrical bandwidth demands of today's and tomorrow's networks.
The future of wireless networks: understanding 802.11n
Looking for a basic article that explains the nuances of 802.11n? Want to explain to your execs or marketing folks what it all means? This is the article for you. In a top-notch treatment, the team at SiGe Semiconductor really took the time to explain this standard and put it in the appropriate context.
Understand receiver dynamics and AGC tradeoffs in WiMAX femto- and picocells
WiMAX deployment is increasing due to the allocation of additional frequency spectrum and the need for higher data rates and broadband access around the globe. Because WiMAX is designed to be a data-centric standard, its infrastructure deployment must be different from previous voice-centric standards such as GSM and CDMA. WiMAX, operators will continue to deploy conventional macrocells, which are intended to provide initial coverage and capacity, but will rely more on smaller base stations to fill gaps in coverage and add needed capacity in densely populated areas like large cities.
Making 4G Wireless a Reality–A mini tutorial
The key to 4G is to align business challenges with infrastructure choices. Here's a mini tutorial on how to make that happen.
How to Cheat at Securing a Wireless Network–Wireless Network DesignI
Here is a multi-part excerpt that covers exploring the design process, identifying the design methodology, and understanding wireless network attributes from a design perspective.
How to mitigate packet loss in wireless USB networking applications
Due to the likelihood of collisions in the wireless medium, care must be taken when migrating an application from wired to wireless USB.
Signal Integrity Engineer's Companion: The Wireless Signal–Part I
A discussion of new techniques in wireless signal measurement and though-provoking ideas about signal analysis in the modern wireless environment.
Wireless data rates: Bandwidth, noise, and interference
This series of articles lays out Shannon's law for channel capacity, and explains how bandwidth varies with signal power, noise, and interference. It also introduces the concepts of MIMO and spatial processing.
Adding 3G Radio to Embedded Devices: Five Steps to Success
This article walks you through the key decisions you need to make to best integrate 3G technology with your existing hardware and software.
PRODUCT HOW-TO: Simplify the design of the cellular base station digital predistortion subsystems
How to use Linear Tech's LTM9003 digital predistortion micromodule to build a fully integrated digital predistortion (DPD) reciver for use in cellular network base station designs.
  EDITOR'S NOTE by Bernard Cole, Embedded.com Editor
ESC 2010 is just around the corner (April 26-29) and EETimes has prepped a series of special panels dealing with critical issues and opportunities facing our industry. In “The Rx for medical electronics”, Rich Merritt will lead a group that will explore the challenges facing a field that is still making the historic transition to the digital, networked era, while in “Turning on the smart grid”, George Leopold and his panel of experts will give the outlook on the challenges and opportunities ahead for smart grid. For more info, see the full roster here.

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