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Method for modulating and demodulating minimum frequency shift keying signal and special method for designing complex analytic band-pass filter

A band-pass filter and frequency shift keying technology, which is applied in the modulation carrier system, phase modulation carrier system, baseband system components, etc. question

Inactive Publication Date: 2010-06-16
XUCHANG UNIV
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Problems solved by technology

The anti-interference performance of coherent demodulation is slightly better than other forms of demodulation, but because coherent demodulation requires carrier extraction and synchronization, differential decoding, and parallel-to-serial conversion at the receiving end, it is more complicated to implement
The non-coherent demodulation method is simple to implement and does not need to recover the synchronous carrier. The demodulation methods include envelope detection method, frequency discrimination method, zero-crossing detection method and differential demodulation method, but these demodulation methods are used in DSP (digital signal When it is implemented, its algorithm is very complex, and the implementation process is very cumbersome, which cannot meet the requirements of various transmission protocols for minimum frequency shift keying signals

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  • Method for modulating and demodulating minimum frequency shift keying signal and special method for designing complex analytic band-pass filter
  • Method for modulating and demodulating minimum frequency shift keying signal and special method for designing complex analytic band-pass filter
  • Method for modulating and demodulating minimum frequency shift keying signal and special method for designing complex analytic band-pass filter

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Embodiment Construction

[0022] 1. Using DSP and complex signal processing to realize the method of minimum frequency shift keying (MSK) signal

[0023] 1.1 Minimum shift keying (MSK) signal

[0024] The expression of minimum shift keying (MSK) signal can be written as

[0025] s(t)=cos[2πf c t+θ(t)] (1)

[0026] in:

[0027] kT b ≤t≤(k+1)T b (2)

[0028] Where: f c is the carrier frequency; T b is the code unit width; a k It is related to the kth input symbol, and its value is ±1; is the phase constant in the kth input symbol at time kT b ≤t≤(k+1)T b remain unchanged. If the transmission rate of the binary minimum frequency shift keying (MSK) signal is r b , the frequency offset is f Δ , when sending data "0" code, the signal frequency is f 2 , a k =1; the signal frequency is f when sending the data "1" code 1 , a k =-1; then

[0029] r b =1 / T b (3)

[0030] f 1 = f c -...

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Abstract

The invention relates to a method for modulating and demodulating a minimum frequency shift keying signal and a special method for designing a complex analytic band-pass filter. A complex analytic band-pass filtering method is adopted to realize the modulation and demodulation of the minimum frequency shift keying signal; the minimum frequency shift keying signals of different central frequencies do not need various band-pass filters, the minimum frequency shift keying signals of the same transmission bandwidth only need one band-pass filter, and then a processor calculates the complex analytic band-pass filter having the central frequency serving as a carrier frequency, so the complexity of a signal processing algorithm is greatly lowered and sharing among wave filters having the same transmission rate is realized.

Description

technical field [0001] The invention relates to a minimum frequency shift keying signal modulation and demodulation method and a special complex analysis band-pass filter design method. Background technique [0002] (1) The modulation and demodulation of the traditional minimum frequency shift keying (MSK) signal is usually implemented by real signal processing. Since the minimum frequency shift keying signal is a bandpass signal, for the same data transmission rate, although the minimum frequency shift The transmission bandwidth of the keying signal is the same, but because the center frequency of the minimum frequency shift keying signal is different, different band-pass filters (BPF) need to be designed, and the sharing of filters cannot be realized, so the implementation is relatively cumbersome. [0003] (2) Since the minimum frequency shift keying signal has the following characteristics: [0004] ①The amplitude of the modulated signal is constant; ②The frequency shif...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00H04L27/22H04L25/03
Inventor 王奎甫程菊明张向群张江维孟雷孟耀伟李慧娜郭超峰张志立张德喜李俊强司文建李娟
Owner XUCHANG UNIV
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