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Modulation method based on elliptically spherical function

An elliptical spherical wave and modulation method technology, applied in the modulation carrier system, digital transmission system, amplitude modulation carrier system, etc., can solve the problems of electromagnetic interference of adjacent users, slow increase of frequency band utilization rate, and reduction of system power utilization rate.

Inactive Publication Date: 2012-06-06
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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Problems solved by technology

Although multi-ary modulation can improve the frequency band utilization of the system, it will reduce the power utilization of the system; the most typical modulation method using spectrum aliasing technology to improve the frequency band utilization is Orthogonal Frequency Division Multiplexing (OFDM) technology (Li Dazhi, Wang Chengyou, Wang Ying, Principle and Implementation of Orthogonal Frequency Division (OFDM) [J], Shandong Electronics, No. 4, 2002, 40-42), by using multiple orthogonal sub-channels to transmit information, effective It improves the frequency band utilization of the system, and its limit value can reach 2Baud / Hz, but because its baseband waveform adopts rectangular pulses, the spectrum of the modulated signal is a sinc function spectrum (Cao Qisheng, Liang Dequn, Research on non-orthogonal multiple modulation[J] , Acta Electronics Sinica, January 2006, 34(1): 19~23), out-of-band power attenuation is slow, frequency band utilization rate increases slowly, and it is easy to generate electromagnetic interference to adjacent users

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  • Modulation method based on elliptically spherical function
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  • Modulation method based on elliptically spherical function

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Embodiment

[0045] Design requirements: within the frequency range of 100kHz to 100.18kHz, the modulation method proposed by the present invention is adopted to achieve a communication rate of 288Baud, that is, the utilization rate of the system unit frequency band is 1.6baud / Hz.

[0046] Design analysis: According to the design requirements, the information transmission bandwidth is 180Hz. If the number k of baseband frequency bands is 4, the bandwidth of each sub-frequency band is 72Hz, and they are interleaved with each other by 36Hz. If the time-bandwidth product of the ellipsoidal wave function is c=4π, Then the symbol duration is T s =c / πB 0 = 55.6ms.

[0047] ① Multi-channel time-domain quadrature baseband modulation waveform design.

[0048] Divide the baseband frequency band 1~180Hz with a bandwidth of 180Hz into 4 sub-bands, each sub-band has the same bandwidth of 72Hz, and they are interleaved with each other by 36Hz, the first sub-band is: 1-72Hz, the second sub-band is: 36H...

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Abstract

The invention provides a modulation method based on an elliptically spherical function. With the design of the multiplexing time-domain orthogonal base band modulation waveform, a multiplexing base band premodulation is carried out. Signals after the base band premodulation at each branch are superimposed and synthesized in a time domain to form a path of signals, and then sine-wave carrier modulation is carried out to move the frequency spectrum of the signal to radiation frequency band and then the frequency spectrum is output. The waveform of the base band modulation adopts the ellipticallyspherical function with limited time-domain duration time and approximately finite frequency band. The frequency band of a communication system can rapidly approach to the Nyquist rate with the increase in the number of the time-domain orthogonal base band modulation waveform. Simultaneously, the system has better power utilization rate and is convenient and easy to realize.

Description

technical field [0001] The present invention relates to a modulation method in radio communication, in particular to a modulation method based on multi-channel baseband pre-modulation. Background technique [0002] The radio spectrum is a limited natural resource. Under the premise of meeting the existing radio spectrum management requirements, research on communication technologies with high frequency band utilization and power utilization is the best way to make full, reasonable and effective use of radio spectrum, ensure the normal operation of various radio services, and prevent various radio services. , The key to mutual interference between radio stations and systems is also the unremitting goal in the field of radio communication. [0003] According to the first criterion of Nyquist, for a transmission system with a bandwidth of W, the limit rate of the frequency band utilization of the communication system is 2WBaud, that is, the Nyquist rate, but the impulse respon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/00H04L27/02
Inventor 王红星赵志勇刘锡国
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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