Modulation method based on elliptically spherical function

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 elliptically spherical 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...

AI Technical Summary

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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