Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification

A phase accumulator and modulation signal technology, applied in the field of signal processing, can solve the problems of complex clutter signals, difficulty in generating narrow pulses, interference with MSK modulation signals, etc.

Active Publication Date: 2013-12-11
XIDIAN UNIV
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When this traditional MSK modulation signal generation method is used for MSK signal modulation, five steps must be followed in order: differential encoding, serial-to-parallel conversion, signal baseband quadrature synthesis, signal-carrier quadrature synthesis, and signal subtraction. It is complex and will generate some unnecessary clutter signals that interfere with the generation of MSK modulated signals
[0007] The impulse method based on the surface acoustic wave filter is to solidify the impulse response into the surface acoustic wave filter. As long as the pulse controlled by the baseband signal is used for excitation, the required MSK signal can be output. This method starts from the line equation See, although the circuit design is relatively simple, it is difficult to generate a narrow pulse with a certain amplitude

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification
  • MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification
  • MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0038] 1. Technical principle:

[0039] Such as figure 2 As shown, the direct frequency synthesis DDS signal is to generate a waveform by using the phase accumulator to query the storage table that stores the waveform information of the trigonometric function, such as Figure 4 shown.

[0040] The MSK modulation signal generates a waveform by phase-modulating the I and Q signals through the input data, where the I and Q signals are as follows:

[0041] C 2 k · cos π f b t = cos ( π f b t + 0.5 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an MSK (minimum shift keying) modulation signal generation method based on DDS (direct digital synthesis) phase accumulator address modification. The method comprises the following steps: (1) setting the values of all phase accumulators generating carrier and data DDS signals; (2) reading in N-bit parallel data and performing serial-parallel conversion to obtain a serial sequence Y; (3) respectively adjusting the Q-path data output address and the I-path data output address; (4) calculating the final values of the DDS data output addresses of the I and Q paths, and updating the final values of the address basic values and carrier output addresses of the I and Q paths; (5) generating the DDS data signals and carrier signals of the I and Q paths by use of the final values of addresses and the final values of carrier output addresses output by the DDS data of the I and Q paths, and outputting the MSK signals of the data cod element; and (6) storing the MSK signal of the data code element, adjusting the data pointer, and outputting the MSK signal of the whole sequence Y. The method disclosed by the invention has the advantages of simple steps and little operational error and error rate, and can be applied to radio communication.

Description

technical field [0001] The invention belongs to the technical field of signal processing, in particular to a method for generating minimum frequency shift keying MSK modulation signals, which can be used in radio communication. Background technique [0002] Minimum frequency shift keying (MSK) modulation is a kind of constant envelope modulation, which can generate modulation signals with constant envelope and continuous phase. Due to the discontinuous phase and large frequency deviation of the signal processed by the general frequency shift keying FSK modulation form, the spectrum utilization rate is low, while MSK is an FSK modulation form with a modulation index of only 0.5, which has a gap between adjacent symbols. The phase is continuous, the bandwidth is narrow, the energy of the main lobe of the spectrum is concentrated, the energy of the side lobe decays quickly, and the advantages of high frequency band utilization are widely used in the field of radio communication...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/12
Inventor 袁晓光冯冬竹何晓川白渊杰邓鉴
Owner XIDIAN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products