Agilent Technologies MXG (Series A and B) Manual de usuario descargar pdf (Pagina 9)

9

Simulate real-world signals with

real-time mode

In Signal Studio, real-time mode

is used to define the parameters

of nonrepeating signals needed

for receiver testing. Its graphical

interface provides a direct instrument

connection for parameter transfer

and closed-loop or interactive control

during signal generation. Real-time

capabilities are currently available in

versions of Signal Studio that address

the following standards:

• LTE FDD/TDD

• W-CDMA/HSPA+

• GSM/EDGE

• cdma2000

®

• GNSS

• Digital video

Real-time generation supports

creation of complex signal scenarios

of extremely long durations. In

satellite navigation applications, an

MXG or EXG can generate up to 32

line-of-site and multipath channels

with greater than 24 hours duration.

In DVB applications, this solution

supports up to two hours of playback

or continuous PN23 data sequences.

Closed-loop testing is becoming

increasingly important with the latest

digital wireless standards, especially

during throughput testing of real-

world channels. In LTE applications,

Signal Studio plus an X-Series signal

generator supports full conformance

testing with BTS loopback

performance testing.

Deep arbitrary

waveform memory

The replay of an arbitrary

waveform file is often an easi-

er way to handle non-standard

or classified signal-simulation

applications. In such cases, an

important but simple technical

advance is deep waveform

memory: the MXG has up to

1 GSa and the EXG has up to

512 MSa.

With 1 GSa, the MXG can

provide a minimum of five

seconds and as much as

hours of a continuous signal

without repeating, depending

on sample rate. This capability

can, in some cases, provide an

alternative to real-time signal

generation.

eNB

Rx A

Rx B

HARQ/TA feedback

Wanted, UL

RF RF

Interferer

RF RF

IN OUT

Fader

LTE receiver performance test with real-time signal generation

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