Analyze Assure Accelerate TM SR5500 Wireless Channel Emulator.

Analyze Assure AccelerateTM

SR5500 Wireless Channel Emulator


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


SR5500 Wireless Channel Emulator

Spirent’s Next-Generation Fading Emulator


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


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


SR5500 Channel Fidelity


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


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


Channel Fidelity

SR5500

Competition

Baseline

WLAN – 64QAM signal

Note: WLAN requires -25 dB minimum EVM


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


SR5500 Real-time control and

Ease-of-Use


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



• 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



• 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"



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)



• Test Assistant simplifies standard fading test by walking you thru a step-by-step setup configuration

Quick and easy standards fading profile set-up



• SR5500 is provided with Dell’s top of the line laptop Latitude D800

• External controller PC allows for equipment versatility and latest operating systems



• 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



• 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



• 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



• 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



• System Setup view displays unit configuration and allows for flexible noise and carrier settings



SR5500 accounts for cable loss to give actual power readings at DUT


SR5500 Real-World Simulation


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



• 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



• 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



• 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



• 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


Real-World Simulations

• DEE goes beyond standards testing giving the ability to create real-world fading scenarios



• 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



• 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


SR5500 Features & Options


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


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 **


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 Accelerate TM SR5500 Wireless Channel Emulator.

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