Chapter 2, Making Measurements

Receiver Sensitivity

Receiver Sensitivity

Overview

In this test, the CDMA generator sends a calibrated signal to the base station’s

 

receiver. For a given RF level, the resulting Frame Error Rate (FER) is measured.

 

Standards specify an FER of 1.0% or less at an RF level of −119 dBm.

 

EVEN SECOND/

(Rear Panel)

 

SYNC IN

 

 

Receiver Port 1

 

 

H

 

 

Receiver Port 2

SYNTH

 

 

REF IN

 

Even-second

 

 

Clock

 

 

Time Base

 

 

H

 

 

 

RF IN/OUT

Figure 19

 

 

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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