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SR5500 Wireless Channel Emulator
Analyze Assure AccelerateTM
Spirent’s Fading Simulator History
• With more than a decade’s experience, Spirent is the world’s leading developer and supplier of high performance fading simulators
• Spirent’s channel emulators accelerate the development and deployment of new products and services by providing detailed control of repeatable real-world radio propagation conditions
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SR5500 Wireless Channel Emulator
Spirent’s Next-Generation Fading Emulator
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SR5500 for today’s Wireless Technologies
• Overcoming multi-path fading is a major obstacle in today's wireless technologies.
• WCDMA, CDMA2000 and WLAN must perform thorough radio channel analysis
SR5500 for physical layer analysis
RX A
RX B
Device
under test Device
tester
ChannelSimulator
or ChannelSimulator
AWGN Generator
AWGN Generator
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SR5500 Key Features
• Superior Channel Fidelity for next generation modulation schemes
• User friendly Real-time control and Ease-of-Use
• Real-World fading generator and channel models ensuring lab results replicate field results
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SR5500 Channel Fidelity
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Channel Fidelity
• Superior Channel fidelity is required in RF test equipment when testing higher order modulation schemes such as HSDPA, EV-DV, and WLAN 64 QAM
• RF test equipment must not be a contributing factor in degrading the users signal, especially for higher modulation schemes
• EVM (error vector magnitude) is used as a measure of signal quality of a modulated RF signal
SR5500 has Superior Channel Fidelity
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Channel Fidelity
• WCDMA/HSDPA & EV-DV – 16QAM signal 16 QAM signal was fed into input of product
Distortion from competition due to poor channel fidelity
CompetitionSR5500
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Channel Fidelity
SR5500
Competition
Baseline
WLAN – 64QAM signal
Note: WLAN requires -25 dB minimum EVM
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Channel Fidelity
• Signal degradation should result from the controlled set fading parameters not parasitic impairments due to test equipment
• RF test equipment should produce the desired channel models and nothing else; it should neither mask problems nor force engineers to account for residual effects.
SR5500 generates desired results
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SR5500 Real-time control and
Ease-of-Use
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Real-time control and Ease-of-Use
• Channel Model parameters can be changed in real-time
• Real-time control eliminates the need for re-calculating the fading profile Reducing test time
Simplifying channel set-up
Competitive solutions must pre-calculate fading models, increasing test times
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Real-time control and Ease-of-Use
• Real-time digital power meter and output power level control
Reduces additional lab equipment needed for measuring power levels
Digital implementation allows for increased accuracy at the measured input and set output levels
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Real-time control and Ease-of-Use
• Real-time digital power meter has dual mode functionality, for increased output and C/N accuracy
Triggered mode ideal for burst signals such as WLAN, 3GPP HSDPA, EV-DV
Continuous mode for non-bursty signals such as GSM, WCDMA and CDMA
ThresholdPower
Input Off(NoiseFloor)
Input On
AveragingInterval
Trigger DetectorRecognizing a"falling pulse"
Trigger DetectorRecognizing a"rising pulse"
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Real-time control and Ease-of-Use
Total control over real-time statistical channel model playbackPlayStopPause
Reproduce fading scenarios to focus on receivers weak points
Real-time channel model Power Delay Profile (2D and 3D mode)
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Real-time control and Ease-of-Use
• Test Assistant simplifies standard fading test by walking you thru a step-by-step setup configuration
Quick and easy standards fading profile set-up
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Real-time control and Ease-of-Use
• SR5500 is provided with Dell’s top of the line laptop Latitude D800
• External controller PC allows for equipment versatility and latest operating systems
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Real-time control and Ease-of-Use
• Spirent understands every lab environment has different means of controlling lab equipment
• The SR5500-API (Application Programming Interface) and SR5500-RPI (Remote Programming Interface) was developed to assist in all lab environments
• Both programming interfaces were developed with the end-user in mind, ease-of-use
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Real-time control and Ease-of-Use
• SR5500 API (Application Programming Interface) Ideal for .NET and Com
environments such as Visual basic, LabView and LabWindows
Provides extensive online Hyperlinked help resources
Simplifies Automated Test System Integration
• SR5500 RPI (Remote Programming Interface) Developed to assist with
test environments not running on Windows based PC’s
recall both standard and custom configured profiles
set Input and Output levels and perform Autosets, the key parameters for fading test
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Real-time control and Ease-of-Use
• SR5500 API Front Panel was added to give user clarification on unit programmable status
• Viewable display is useful for displaying current state of the product during customer automated test
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Real-time control and Ease-of-Use
• Control flow diagram for RPI
User’s Remote Computer
SR5500 Laptop
SR5500Unit
SR5500 System
TCP/IP via Ethernet
Proprietary Control Interface via Ethernet
Control Application
SR5500 Remote Interface Application
SR5500 API
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Real-time control and Ease-of-Use
• System Setup view displays unit configuration and allows for flexible noise and carrier settings
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Real-time control and Ease-of-Use
SR5500 accounts for cable loss to give actual power readings at DUT
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SR5500 Real-World Simulation
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Real-World Simulation
• SR5500 possesses a real-time fading generator
• Produces a repetition rate over 1700 hours without sacrificing number of paths
• Why is real-time fading important? To insure required level of confidence in test
results, a fading sequence should not repeat
To make sure your lab results model field results
• Non-real-time (pre-calculated) fading sequence repetition rate decreases as channel model complexity increases
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Real-World Simulation
• Minimum test duration times for WCDMA receiver evaluation can be as long as 628 seconds
• Example: Sequence repetition rate of 16 seconds effectively shortens test duration from 628 seconds to 16 seconds, reducing test confidence
Repeat#3Competitor
SR5500
Repeat#4
Repeat#N
10’s of seconds
………Beyond 1700 hours
SR5500’s real-time fading ensures real world results
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Real-World Simulation
• If CCDF not correct Rayleigh distribution statistically incorrect
• SR5500 brings the real-world into your lab by making sure all Rayleigh properties are statistically correct
Competitor
SR5500
Not Good
SR5500 complies with all fading statistics
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Real-World Simulation
• The Real-World is a dynamic world, and so are the fading conditions seen by receivers in wireless communications
• Testing Standards use static fading profiles, hardly stressing the receivers performance
• Spirent developed a Dynamic Environment Emulation (DEE) to bring real-world scenarios into the lab
Dynamic Environment Emulation
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Real-World Simulation
• In the real-world, the PDP shape (# paths, path loss, delay spread) changes substantially every few meters (10’s of ms)
• DEE (Dynamic Environment Emulation) allows user to dynamically change parameters such as:
• State Duration
• Channel Output Level
• Path Delay
• Path Status (on/off)
• Relative Path Loss
Real-World channel models for Real-World results
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Real-World Simulations
• DEE goes beyond standards testing giving the ability to create real-world fading scenarios
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Real-World Simulations
• AWGN (Additive White Gaussian Noise) is an unwanted impairment and exist in every wireless environment
• SR5500-AWGN option simplifies wireless receiver test setups, and overall lab cost
• The addition of AWGN further enhances the real-world conditions emulated by the SR5500
SR5500 adds AWGN simplifying lab set-ups
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Real-World Simulations
• Programmable C/N Ratios +30 to –30 dB 0.1 dB resolution
• Greater than 2 hour repetition rate
• AWGN added Digitally for high level accuracy
• Selectable AWGN bandwidths from 1.6 to 26 MHz
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SR5500 Features & Options
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Product Features and Options
• 24 paths with 0.1 ns delay resolution
• 26 MHz Channel bandwidth
• Frequency Range 400 – 2700 MHz
4100 – 6000 MHz (SR5500-6GHz option)
• Annual Support Agreement (SR5500-ASA option) Yearly calibrations
Superior Customer Support
Proactive feature updates
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SR5500 Roadmap
September 2004 Q2, 2005
Potential Future releases
• Diversity• API Front Panel• Cable loss
• Multi-unit single PC (control up to 4 units)
• Simultaneous DEE (control up to 4 units)
• Real-time C/N meter
• AWGN-DEE• MIMO
2004 2005 Future
Q3 Q4 Q1 Q2
** Now Available **
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SR5500 Summary
• Superior Channel Fidelity for next generation high data rates
• Real-time control and Ease-of-Use for improved lab setups and test times
• Real-World results require a fading emulator to produce real-world results
Analyze Assure AccelerateTM
Copyright © 2003 Spirent Communications Inc.
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