Jump to content, skipping navigation

Spirent Logo

Login or Register to My Spirent . Tested with Spirent Blog . Contact Support . Investors

  • Home
  • What are you Testing?

    Technology

    1
    A-GPS
    CDMA/EV-DO Devices
    CDMA EV/DO Infrastructure
    LTE Ecosystem Testing
    2
    MIMO
    UMTS Devices
    UMTS Infrastructure

    Test Area

    • Certification/Conformance
    • Location Testing
    • Mobility inter-RAT
    • Over the Air
    • Radio Access Performance
    • Wireless Receiver
  • What are you Testing?

    Network and Services

    1
    Welcome N2X Users
    40/100 GbE
    Broadband Infrastructure For Multiplay Services
    Data Centers and Enterprise Networks
    Ethernet Services on Live Networks
    Impairments in Networks
    2
    Mobile Backhaul
    Outside Plant & In-Home Testing
    Triple Play Services on Live Networks
    Video and IPTV
    Voice and IMS

    Devices and Equipment

    • Access: DSL
    • Lab and Test Automation
    • Mobile Packet Core
    • Routing & Switching: Enterprise
    • Routing & Switching: Service Provider
    • Security/Firewall/IDS
    • Web and Application Servers
  • What are you Testing?

    Systems

    1
    A-GPS
    Augmentation
    Automotive
    Civil Aviation
    CRPA/Anti-Jam
    Indoor Positioning
    2
    Inertial
    Location Based Services
    Low Power/High Sensitivity
    Military and Government
    Space
    Tailored Solutions

    Devices and Equipment

    • Chipset Testing
    • Consumer Devices
    • GNSS
    • Military
    • Modules
    • Production Testing Capability
  • What are you Testing?

    Wireless

    • 8100
    • AirAccess
    • C2K-ATS
    • Landslide
    • SR5500

    Broadband

    • Abacus
    • Avalanche
    • AX/4000
    • DLS
    • GEM
    • Landslide
    • SmartBits
    • SmartSight Central
    • Spirent Global Services
    • Spirent TestCenter
    • Tech-X Flex

    Positioning & Navigation

    • GSS4200
    • GSS6300
    • GSS6700
    • GSS7735
    • GSS7765
    • GSS7790
    • GSS8000
    • SimAUTO
    • SimINERTIAL
    • SimPLEX45

Wireless blog

Spirent Blogs

  • Broadband blog   RSS Feed
  • Positioning blog   RSS Feed
  • Wireless blog   RSS Feed

Latest Posts

  • Multi-GNSS: The Future of Navigation

    Posted: 3 Mar 2010 8:00 AM. Author: Andy Walker

  • The Death of Best-Effort QoS Testing

    Posted: 2 Mar 2010 8:00 AM. Author: Chris Chapman

  • How a GNSS Simulator can Help Test the Multipath Performance of GNSS Receivers

    Posted: 25 Feb 2010 8:00 AM. Author: Stuart Smith

  • Why are we talking about Multi GNSS?

    Posted: 16 Feb 2010 11:20 AM. Author: John Pottle

  • Why use a GNSS Simulator?

    Posted: 11 Feb 2010 12:00 AM. Author: Steve Hickling

  • View all latest posts

Most Popular Posts

  • Testing 10G Data Center Switches: Scaling 10 Times Higher

    Posted: 18 Jan 2010 12:33 PM. Author: David Newman, Network Test

  • End Of Life Questions: Development and Support

    Posted: 29 Oct 2009 3:51 PM. Author: Michael Lynge

  • The 40/100G Ethernet Testing: Business As Usual?

    Posted: 19 Sep 2009 3:47 PM. Author: Paul Mooney

You are here:
Home >
Tested with Spirent Blog >
Wireless blog
<Back to Tested with Spirent Blog

The Secret Life of Modern RF Signals - Part 5

In the first installment of this blog I said I’d adjust the topic based on reader feedback. As we prepare for 4G, certain RF testing topics keep coming up, so I’m going to derail our topic thread.

By the way, while I do appreciate your emails (most of them, anyway… as to the others, you know who you are...), some good questions and comments might have stimulated useful conversations had they been shared publicly. We ask for contact info when you comment, but we won’t release that to anyone. Also, unless I have your clear permission, I will not publicly share anything that’s emailed to me. So in the interest of sharing information and questions, I’d urge you to please use the Comments section below.

Read full post

Posted: 15 Oct 2009 9:50 AM. Author: Ash Mahjoubi-Amine, Spirent (comments 0)

Testing Real-World A-GPS Performance - The Elements of A-GNSS Simulation - Part 3

Our last posting [Weighing the Options – Three Approaches for Testing Real-World A-GPS Performance] discussed approaches for testing real-world A-GPS performance, ending with a recommendation for a lab-based simulation approach. With its repeatable environment, easy setup, fast test times, automated result collection and enhanced handset performance benchmarking capabilities, lab simulation certainly sounds like a great idea, right? Well actually, of the three approaches we discussed, lab simulation is not the most widely used. Why is this?

For starters, real-world lab simulation is really hard to do correctly. Accurately simulating a handful of moving satellites transmitting wirelessly to a moving receiver while signals are distorted, reflected, and obstructed by moving objects and changing atmospheric conditions is enormously complex. In fact, it has been Spirent’s business for the past 20 years or so to do exactly this, and we’ve struggled with it too!

Read full post

Posted: 9 Sep 2009 8:39 AM. Author: Manikantan Parameswaran (comments 0)

The Secret Life of Modern RF Signals - Part 4

It’s time to answer a question from a couple of weeks back: “if fading is so random, how can we control and quantify what it’s doing?” In other words, how do we express it, record it and eventually repeat it?

One key concept is the idea of Level Crossing Rates (LCR). At a high level, all this means is that a) we choose a level below which we say a fade is a “deep fade”, and b) count the rate at which fades dip below this level.

Read full post

Posted: 1 Sep 2009 12:00 AM. Author: Ash Mahjoubi-Amine, Spirent (comments 0)

Earlier Posts
  • Share This..

    Bookmark & Share

    • Delicious
    • Digg
    • LinkedIn
    • Reddit
    • Stumbleupon
    • Twitter
  • Email to Friend
  • Create PDF

Search Blogs

Popular Tags

  • There are 1 posts tagged with 3G
  • There are 1 posts tagged with A-GNSS
  • There are 1 posts tagged with Beamforming
  • There are 1 posts tagged with call reliability
  • There are 1 posts tagged with Channel Emulation
  • There are 1 posts tagged with channel model
  • There are 1 posts tagged with Doppler
  • There are 1 posts tagged with GCM
  • There are 1 posts tagged with Laplacian
  • There are 1 posts tagged with MIMO
  • There are 1 posts tagged with mobile devices
  • There are 1 posts tagged with Receive Diversity
  • There are 2 posts tagged with SCM
  • There are 1 posts tagged with SCME
  • There are 1 posts tagged with Simulation
  • There are 1 posts tagged with SMLC/PDE
  • There are 1 posts tagged with Spatial Channel Model
  • There are 1 posts tagged with Testing
  • There are 1 posts tagged with Transmit Diversity
  • There are 1 posts tagged with UMTS

Archive

  • Contact us
  • Careers
  • Terms and Conditions
  • Sitemap
  • www.spirent.cn

© 2010 Spirent Communications