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

A quaternary, mode 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: 2014-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Frequency shift keying can distinguish channels, but the anti-interference ability is not as good as phase shift keying and differential phase shift keying

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

[0016] 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

technical field [0001] The present invention relates to a modulation method and device, in particular to a cascade mode-based quaternary MSK modulation method and device. Background technique [0002] The research of signal modulation format is a hot spot in the current communication field, and the improvement of transmission performance by new modulation formats has attracted people's attention. [0003] Modulation technology is a technology that converts baseband signals into transmission signals. After the analog signal is sampled and quantized, the optical carrier is modulated on and off with a binary digital signal "1" or "0", and pulse coding (PCM) is performed. The advantage of digital modulation is that it has strong anti-interference ability, and the influence of noise and dispersion does not accumulate during relaying, so long-distance transmission can be realized. [0004] According to the nature of the modulation signal, the modulation method is divided into tw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/12
Inventor 黄本雄邹宁马欣杨洋徐争光王怿
Owner HUAZHONG UNIV OF SCI & TECH
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