Application Example: Gsm Am Suppression Test; Required Options; About The Am Suppression Testing - R&S SMW-K550 User Manual

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R&S

SMW-K550

4 Application Example: GSM AM Suppression

Test

AM suppression testing is one of the base station (BS) receiver tests, specified in

3GPP

According to the specification, the testing of multi-carrier base stations (BS) equipped

with multi-carrier receiver requires up to four wanted and one interfering signals.

A typical signal generator generates one or two test signals. The test setup for AM sup-

pression tests of a multi-carrier BS would then require two or more signal generators.

Such setup can require extensive configurations and complex synchronization.

In R&S SMW equipped with option R&S SMW-K550, the generation of 4 wanted and

one interfering GSM signals is a straightforward solution. This section is a short intro-

duction in the AM suppression testing. It also shows how to use the dedicated func-

tions to generate, route and output the required signals.

The following example shows the configuration principle in general.

Not all required settings are shown. The used settings do not comply with the specifi-

cation.

4.1 Required Options

The equipment layout includes:

●

Option standard Baseband Generator (R&S SMW-B10) per signal path and

Option Baseband main module, with two I/Q paths (R&S SMW-B13T)

●

Option Frequency (R&S SMW-B10x) for signal path A

●

Option Frequency (R&S SMW-B20x) for signal path B

●

Option Multiple Entities (R&S SMW-K76)

●

Option Stream Extender (R&S SMW-K550)

●

2x option GSM/EDGE and EDGE Evolution (R&S SMW-K40/-K41)

For more information, refer to the instrument specification (data sheet).

4.2 About the AM Suppression Testing

Receiver measurements are tests of the ability of a BS receiver to demodulate signals

while achieving specified minimum bit error rate (BER). Several test cases are speci-

fied. Their goal is to assure the GSM performance in different conditions, like for exam-

ple low signal power or intermodulation. The AM suppression test for example is a

receiver test that measure the receiver ability to cope with strong GSMK interfering sig-

nal.

User Manual 1178.3263.02 ─ 01

51.021.