Compound signal transmission and communication method based on equal-amplitude equal-period modulated carrier wave technology

A technology of periodic modulation and composite signal, applied in modulation carrier system, transmission system, digital transmission system, etc., to achieve good narrowband characteristics and improve data transmission efficiency.

Inactive Publication Date: 2010-05-19
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, in the above systems, the carrier only plays the role of a vehicle, and has not fully exerted its effectiveness. If the carrier here can be redeveloped and utilized, and a useful information can be transmitted, the performance of the existing communication system can be greatly improved. information transmission efficiency

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  • Compound signal transmission and communication method based on equal-amplitude equal-period modulated carrier wave technology
  • Compound signal transmission and communication method based on equal-amplitude equal-period modulated carrier wave technology
  • Compound signal transmission and communication method based on equal-amplitude equal-period modulated carrier wave technology

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Embodiment Construction

[0063] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0064] figure 1 , 2 is an AM broadcast transmission system implementing the method of the present invention. The content and up-conversion in the dotted line box in the figure are newly added parts, and the existing AM broadcasting system is outside the dotted line box. The difference between the sending end of this system and the traditional transmitting station is only in the place where the carrier is provided. The traditional method is to use a single frequency sine wave as the high frequency carrier, but here the carrier signal with high-speed digital information is used. First, the analog audio signal a(t) is added to the DC level M, and the DSB-AM modulation is performed on the high-frequency carrier provided by the carrier shaping system in the dotted box, and then passed through the band-pass filter and power amplifier after...

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Abstract

The invention discloses a compound signal transmission and communication method based on an equal-amplitude equal-period modulated carrier wave technology, which comprises two parts, including the compound transmission of an analog signal and digital information and compound information receiving demodulation, wherein the compound transmission of the analog signal and the digital information comprises the following steps of coding an information source, coding a channel, forming a carrier wave, modulating a base band and modulating upper frequency conversion; in the carrier wave formation, a wave shape of a carrier wave is directly changed by a binary system information code element; compared with a standard sinusoidal wave, a modulated wave shape f1(t) generated when an information bit is one and a modulated wave shape generated when the information bit is zero have an adjustable tiny difference; and the compound information receiving demodulation comprises the following steps of demodulating lower frequency conversion, the analog signal and the digital information, decoding the channel and decoding the information source. The method realizes the compound transmission of the analog signal and the digital information and improves the utilization ratio of communication and transmission resources.

Description

technical field [0001] The invention is a communication method for composite transmission of analog signals and digital information based on equal-amplitude and equal-period modulation carrier waves, which can be applied to various communication transmission systems using sine waves as carrier waves. Background technique [0002] Generally, the frequency of the data that needs to be sent in the communication system is low frequency. If it is transmitted according to the frequency of these data, it will not be conducive to reception and synchronization. However, the carrier transmission method is used to load the data signal on the high frequency carrier. Different The data signal directly changes the amplitude of the carrier, and the receiver receives it according to the frequency of the carrier, so that the original sent data signal can be extracted. [0003] However, in the above systems, the carrier only plays the role of a vehicle, and has not fully exerted its effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/00
Inventor 张羽闾国年张璐吴游朱松盛殷奎喜
Owner NANJING NORMAL UNIVERSITY
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