HP 83236B S Interface manual Receiver Performance in Additive Noise

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Chapter 2, Making Measurements

Receiver Performance in Additive Noise

Receiver Performance in Additive Noise

Overview	In this test, the CDMA signal generator is used with the Additive White Gaussian
	Noise (AWGN) source to simulate an uplink signal to the base stations’s receiver.
	Various levels of signal-to-noise (Eb/No) can be used and the resulting Frame
	Error Rate (FER) is measured at each Eb/No level.

EVEN SECOND/

SYNC IN

Receiver Port 1

H

Receiver Port 2

Even-second

Clock

(Rear Panel)

SYNTH

REF IN

	Time Base
	H
	RF IN/OUT
Figure 21
NOTE:	The test procedures outlined in this section require that you have already configured the
	Test System as outlined in chapter 1, "Getting Started".
Requirements	• You will need a means of reading the Frame Error Rate (FER) from the base station.
	The CDMA generator sends a random bit pattern which the base station decodes and
	uses to calculate FER. Some means of reading the calculated value is required. Often
	this is done via a laptop PC connected to the station equipment by serial or LAN port.

•This test requires synchronization between the Test System’s CDMA signal generator and the base-station-under-test. This is achieved using the Even-Second clock signal from the base station.

•The CDMA generator should be connected directly to the receiver’s input(s). This can be achieved by connecting to only one input at a time or by using a splitter to connect to both inputs at once (if there is more than one receiver test port).

•You must know the following about your base station and setup:

❒The base station channel number setting.

❒The Receiver PN Offset for the base-station-under-test (typically 0).

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Contents CDMA/PCS Base Station Test Software, User’s Guide Restricted Operating Overview Conventions Used in this Book Contents Making Measurements Receiver Sensitivity Operating Overview Setting the Test System Beep Glossary Index Getting Started Introduction Required Equipment You must supplySynth REF Load and Run the CDMA/PCS BS Test Software Tests Main Menu screen CDMA/PCS Test Software main menu features Configure the Software Select Configuration Information MenuScroll to and select your band of interest User k1 Problems Perform Cdma TestsIf You Had Perform Cdma Tests Making Measurements Making Measurements Overview Transmitter Measurements Receiver Measurements OtherAverage Power OverviewRequirements Steps Information Menu under TX Measurement Path LossModulation Quality Rho Measurement not Correlating in , Troubleshooting, on Code Domain Power Menu Code Domain Timing Details on the use of the Code Domain Analyzer screen Code Domain Phase Already selected Transmit Spectrum AnalyzerSteps Go to Spectrum Analyzer @ Present Chan Steps Go to Spectrum Analyzer & Enter Freq Transmit Spectrum Receiver Sensitivity Main menu, enter the Base Station Channel number Error Rate FER is measured at each Eb/No level Receiver Performance in Additive NoiseEb/No Level Search for PN Offset PN Offset not Found Check for a valid clock signal from the base station Check Even-Second ClockCorrelating in , Troubleshooting, on Check Even-Second Clock Operating Overview Configuration InformationReference Selecting a PCS Band To select a new PCS BandChannel plans for PCS Band selections Compensating for TX and RX Measurement Path Loss You must know the following loss valuesSaving Configuration Information to Memory BeepLoading Configuration Information from Memory Requirements StepsPurging Configuration Information from Memory Turning On Using AutostartAutostart Feature Turning OffViewing Instrument Connections ConnectionsSetting the Test System Beep To Memory on Cdma Base Station Operating Overview Troubleshooting Troubleshooting Errors When Loading and Running the Software Memory Overflow ErrorsTest System Configuration Errors at Runtime Compensation not performed. Check Duplex OUT cable. Retry? Errors When Loading and Running the Software Errors While Attempting Measurements Cdma Measurement not CorrelatingErrors While Attempting Measurements Frame Error Rate Receiver Measurements Incorrect Base Station Channel entryErrors While Attempting Measurements Average Power Questionable Measurement ResultsMeasurements Rho MeasurementsCode Domain Receiver TestsSensitivity tests random data not selected for signal source Questionable Measurement Results Glossary Glossary Modulation Quality See Rho Glossary Glossary Glossary Index Index FER Index Oqpsk PCS Qpsk UCT Walsh chip