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Multiplexer-related

Device-for-generating-a-digitally-modulated-test-signal

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Device for generating a digitally modulated test signal

Details

Inventors: Kernchen, Wolfgang; Braunstorfinger, Thomas;
Assignee: Rohde & Schwarz GmbH & Co. (Munich, DE)
Primary Examiner: Ghayour; Mohammed
Assistant Examiner: Ettehadieh; Asian
Attorney, Agent or Firm: Lewis, Rice & Fingersh, L.C.

The aim of the invention is to generate a digitally modulated test signal, which is generated in the form of a multitude of transmission channels from a digital modulation data stream according to a predetermined digital modulation standard, and which is fed as I and Q values to an I/Q modulator. To this end: a) a portion of the transmission channels is generated, in a modulation coder, directly from an internal or external modulation data stream according to the predetermined modulation standard; b) the I and Q values for at least one portion of the remaining channels are fed as a pre-calculated modulation data sequence of alimited length from a memory to the modulation coder, and; the I and Q values generated according to a) and b) are added and fed to the I/Q modulator.

DETAILED DESCRIPTION The invention claimed is: 1.
A method for generating a digitally modulated test signal comprising: generating a first group of transmission channels comprising I and Q values, in a modulation coder, directly from a modulation data stream according to a predetermined standard; generating a second group of transmission channels comprising I and Q values by repeating a pre-calculated data sequence of limited length, said pre-calculated data sequence being recalled from a memory of a modulation coder; adding said I and Q values of said first group and said second group; and feeding the result to an I/Q modulator to generate said test signal.
2.
The method of claim 1 wherein said adding of said first group and said second group takes places synchronously with a clock signal and with the correct temporal correlation between the I and Q values.
3.
The method of claim 2 wherein the I and Q values of the first group are buffer-stored in a memory having a different storage length from a memory that receives the I and Q values of the second group.
4.
The method of claim 3 wherein the I and Q values of the first group are generated in real time directly for said modulation data stream.
5.
The method of claim 4 wherein said modulation data stream is an internal modulation data stream.
6.
The method of claim 4 wherein said modulation data stream is an external modulation data stream.
7.
The method of claim 1 wherein the I and Q values of the first group are buffer-stored in a memory having a different storage length from a memory that receives the I and Q values of the second group.
8.
The method of claim 7 wherein the I and Q values of the first group are generated in real time directly for said modulation data stream.
9.
The method of claim 8 wherein said modulation data stream is an internal modulation data stream.
10.
The method of claim 8 wherein said modulation data stream is an external modulation data stream.
11.
The method of claim 1 wherein the I and Q values of the first group are generated in real time directly for said modulation data stream

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