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Method, device and digital signal generator for generating quadrature amplitude modulation signal

A quadrature amplitude modulation and generation method technology, applied in the generation of quadrature amplitude modulation signals and digital signal generators, can solve the problems of large storage space, inability to flexibly modify the modulation type, poor scalability, etc., and achieve reduction Occupancy of storage space, good flexibility and scalability, easy to implement effects

Active Publication Date: 2017-08-25
RIGOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] (1) The above-mentioned 16QAM modulator only uses a fixed-order pseudo-random sequence as the modulation source, which cannot meet the requirements of flexible and adjustable modulation source types in modern digital signal generators
[0014] (2) In order to generate 16QAM modulation signals, there are 8 built-in sine and cosine expressions in the numerical control and the lookup table unit, which requires a large storage space, and if 64QAM and 256QAM are to be generated, more storage space is required
[0015] (3) The above-mentioned 16QAM modulator places multiple sine-cosine tables fixedly in the numerical control and the look-up table unit, so the scalability is very poor, and the modulation type cannot be flexibly modified, such as 8QAM, 16QAM, 64QAM, 256QAM, QPSK Wait

Method used

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  • Method, device and digital signal generator for generating quadrature amplitude modulation signal
  • Method, device and digital signal generator for generating quadrature amplitude modulation signal
  • Method, device and digital signal generator for generating quadrature amplitude modulation signal

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] Such as figure 1 Shown is a schematic structural diagram of a device for generating a quadrature amplitude modulation signal provided by an embodiment of the present invention, the device includes: a QAM modulation control unit 110, a digitally controlled oscillator 120, a first multiplier 130, and a second multiplier 140 , an adder 150 and an output unit 160, wherein the QAM modulation control unit 110 further includes a control module 111 and a modulation ...

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Abstract

Embodiments of the present invention provide a method and device for generating a quadrature amplitude modulation signal, and a digital signal generator. The method includes: selecting a modulation source from an analog source, a user-defined data file or a pseudo-random sequence according to the user's modulation source selection instruction. The item is used as the I-channel and Q-channel data to be modulated; two orthogonal carriers are generated according to the carrier frequency set by the user; the I-channel and Q-channel data are multiplied by the two orthogonal carriers; the two products are added together to obtain digital The QAM modulated signal; the QAM modulated signal is converted into an analog signal and output. The embodiment of the present invention can set various parameters of QAM modulation, including modulation type, modulation source, carrier rate, and baseband rate, and has good flexibility and scalability; in addition, the embodiment of the present invention does not need to store too many sine and cosine tables , which is easy to implement and reduces the storage space occupied.

Description

technical field [0001] The invention relates to the field of signal generation, in particular to a method, device and digital signal generator for generating quadrature amplitude modulation signals. Background technique [0002] Quadrature Amplitude Modulation (Quadrature Amplitude Modulation, QAM) is a high-order modulation method combining amplitude and phase, which has higher frequency band utilization and better power utilization. The so-called quadrature amplitude modulation is to use two independent baseband waveforms to suppress the double sideband modulation of two mutually orthogonal carriers of the same frequency, so as to realize the orthogonality of the frequency spectrum of the modulated signal in the same bandwidth. Two-way parallel digital information transmission. [0003] The current quadrature amplitude modulation has two implementations, analog and digital. Due to the unsatisfactory consistency and stability of analog devices, the performance of the syst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/34
Inventor 丁新宇王悦王铁军李维森
Owner RIGOL
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