Non-sine time-domain quadrature modulation method

A modulation method, non-sine wave technology, applied in the modulation carrier system, digital transmission system, electrical components, etc., can solve the problem that the modulation signal cannot meet the radio spectrum management, cannot form a small relative bandwidth signal, and can only be used in the baseband transmission system and other issues, to achieve the effect of small relative bandwidth or narrowband communication, good power utilization, and avoiding distortion

Active Publication Date: 2009-04-15
中国人民解放军海军航空大学航空作战勤务学院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect of this method is: since there is no method for shifting the frequency spectrum of the modulated signal, and no method for effectively controlling the frequency spectrum bandwidth, the modulated signal can only form a signal with a large relative bandwidth, but cannot form a signal with a small relative bandwidth.
The modulated signal generated by this method cannot meet the requirements of radio spectrum management, and can only be used in baseband transmission systems, or extremely low frequency communication system

Method used

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Experimental program
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Embodiment 1

[0036] Design requirements: in the frequency range of 1000Hz ~ 1250Hz, to achieve a communication rate of 400baud transmission.

[0037] Design analysis: According to the design requirements, the system transmission bandwidth is 250Hz, and the center frequency is 1125Hz. Through calculation, it can be known that the frequency band utilization rate of the transmission system is 1.6baud / Hz, and the relative bandwidth is 11%, which means that a large relative bandwidth signal design is required. With the present invention, the time-domain orthogonal pulse group adopts the PSWF pulse group, and the specific implementation process is as follows:

[0038] ①Time domain orthogonal PSWF pulse group parameter setting

[0039] Under the conditions of system bandwidth B=250Hz and system frequency band utilization rate η=1.6baud / Hz, when the number of orthogonal pulses is M=16, according to the relationship: M BT s = ...

Embodiment 2

[0055] Design requirements: move the frequency spectrum of the modulation signal shown in the first embodiment to the frequency band of 200kHz-200.25kHz.

[0056] Design analysis: The transmission bandwidth of the system remains unchanged at 250Hz, but the relative bandwidth becomes 0.06% at this time, that is, a small relative bandwidth signal design is required. The specific implementation process is as follows:

[0057] In the system bandwidth B, the system frequency band utilization η, the number of orthogonal pulses M, and the pulse duration T s Under the premise of unchanged, adjust the upper and lower limit parameters of the frequency domain of the j pulse group so that f L =200kHz, f H =200.25kHz, construct a new time-domain orthogonal PSWF pulse group according to the time-domain orthogonal PSWF pulse group construction method described in step ② of the first embodiment, and complete the information modulation according to the steps ③, ④, and ⑤ of the first embodiment. Th...

Embodiment 3

[0059] Design requirements: on the premise of keeping the system frequency band utilization rate unchanged, with 200.125kHz as the center, the frequency spectrum of the modulated signal shown in the second embodiment is expanded twice.

[0060] Design analysis: When the system frequency band utilization rate η=1.6baud / Hz does not change, if the spectrum is expanded twice, the total transmission capacity will also increase by two times, that is, the transmission rate is 800baud. The specific implementation process is as follows:

[0061] Adjust the upper and lower limit parameters of the frequency domain of the pulse group to make f L =199.875kHz, f H =200.375kHz, the system bandwidth is B=500Hz, and the number of quadrature pulses is still M=16, according to the relationship: M / BT S =η, the pulse duration should be T s = 20ms. The parameter settings of the time-domain orthogonal PSWF pulse group are shown in Table 2.

[0062] Table 2 Time domain orthogonal PSWF pulse group paramet...

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Abstract

The invention provides a non-sinusoidal time domain orthogonal modulation method which is non-sinusoidal wave modulation based on orthogonal pulse transmission information. Signals to be transmitted are modulated onto a time domain orthogonal impulse group and impulse parameters are regulated to realize the spectrum shifting and the spectrum control of the modulated signals. The modulated signals are band-limited signals, the spectrum characteristic of which can be controlled. The modulated signals can be applied to any communication frequency band. Communication with relative large bandwidth or broadband communication can be realized, and communication with relative small bandwidth or narrowband communication can be realized. In spectrum management, the method can be compatible with an existing frequency band-division and channel-division communication mode of a relative small bandwidth communication system. And the frequency band utilization rate of the system can infinitely approach Nyquist rate with the increase of orthogonal impulses.

Description

Technical field [0001] The present invention relates to a modulation method in radio communication, in particular to a non-sine wave modulation based on time-domain orthogonal pulse transmission information. Background technique [0002] Since Marconi invented the LC resonant circuit in the early twentieth century, radio communication systems based on sinusoidal carrier waves have been dominant. There are two main reasons for this: First, according to the Fourier transform theory, when a sine wave is used as a carrier to modulate the transmission signal, the signal spectrum can be moved very simply and without distortion. After filtering by a filter, the radio Signals can be transmitted in designated frequency bands and channels that are prone to electromagnetic wave propagation to achieve radio communication. Second, the LC resonant circuit based on sine wave resonance has linear time invariance, easy frequency selection, and easy implementation. The requirements of the radio co...

Claims

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Application Information

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IPC IPC(8): H04L27/00H04B14/00H04B1/69
Inventor 王红星赵志勇刘锡国毛忠阳张磊舒根春
Owner 中国人民解放军海军航空大学航空作战勤务学院
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