Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device

A quaternary, cascaded technology, applied in the direction of frequency modulation carrier system, etc., can solve the problem that the anti-interference ability is not as good as phase shift keying and differential phase shift keying, etc., and achieve the effect of constant envelope, small bandwidth and continuous phase

Inactive Publication Date: 2011-04-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patented technology allows for an evenly-enveloped (constant) waveform that has minimal energy at certain frequencies while still being very narrow or consistently wide. This results from utilizing specific structures within it's design.

Problems solved by technology

This patents describes different techniques for transmitting data over wireless networks such as radio waves and lightwave communications. These methods involve converting electrical signals onto an intermediate representation through various means like voltage levels, frequency shifts, phase shifting, etc., then sending these representations via wires/opthalmns, fiber cables, or other media. However, there exist challenges related to improving their effectiveness while reducing interference from external sources.

Method used

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  • Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device
  • Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device
  • Cascade-mode-based quaternary minimum-shift keying ( MSK) modulation method and device

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Embodiment Construction

[0019] Such as figure 1 As shown, the current symbol symbol a to be sent k 101 is divided into upper and lower channels through serial-to-parallel conversion b k 102 and c k 103,b k 102 and c k 103 After XOR operation, get d k 104:c k 103 The other path passes through the 2FSK module 110 to obtain a frequency interval of 1 / T s The 2FSK signal is connected to the 2MSK module 111 after passing through the bandpass filter 108 . d k 104 is differentially encoded to obtain e k 105,e k Then through the serial-to-parallel conversion, the upper branch passes through the delayer 106 to obtain q k 107 is connected with the same direction component of 2MSK module 111, and the lower branch is p k 109 is connected to the quadrature component terminal of the 2MSK module 111. The output end of the 2MSK module 111 is connected to the bandpass filter 112 to output a 4MSK signal. Among them, the 2FSK system is a process of splitting the carrier frequency in one level. In the proces...

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Abstract

The invention relates to a cascade-mode-based quaternary minimum-shift keying (MSK) modulation method and a cascade-mode-based quaternary MSK modulation device. A modulator comprises a first serial parallel converter and a second serial parallel converter; a demodulator comprises a 2FSK (frequency shift keying) modulation module and a 2MSK modulation module; the upper braches of the first serial parallel converter are connected with the second serial parallel converter by an EOR (exclusive OR) arithmetic unit and a differential coder in turn; the lower braches of the first serial parallel converter are connected with the input end of the 2MSK modulation module through the 2FSK modulation module and a band-pass filter in turn; the upper branch of the second serial parallel converter is connected with the cophase component end of the 2MSK modulation module through a delayer; the lower branch of the second serial parallel converter is connected with the orthogonal component end of the 2MSK modulation module; the output end of the 2MSK modulation module is connected with the band-pass filter; and the lower branch of the first serial parallel converter is connected with the EOR arithmetic unit. Due to the adoption of the method and the structure, quaternary MSK signals, which have constant envelope, continuous phases, minimum bandwidth and strict orthogonality, can be provided.

Description

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Claims

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Application Information

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Owner HUAZHONG UNIV OF SCI & TECH
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