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Composite transmission communication method of analogue signal and digital signal of broadcast communication system

An analog signal and digital signal technology, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve problems such as energy consumption, and achieve the effects of low equipment cost, concentrated spectrum energy, and good narrowband characteristics

Inactive Publication Date: 2012-07-04
NANJING NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Take analog double sideband amplitude modulation (DSB-AM) with reserved carrier as an example. The carrier itself does not carry useful information, but consumes a lot of energy

Method used

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  • Composite transmission communication method of analogue signal and digital signal of broadcast communication system
  • Composite transmission communication method of analogue signal and digital signal of broadcast communication system
  • Composite transmission communication method of analogue signal and digital signal of broadcast communication system

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Embodiment Construction

[0057] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0058] figure 1 , 2 is an AM broadcast transmission system implementing the method of the present invention. The content in the dotted line box in the figure is the newly added part, and the outside of the dotted line box is the existing AM broadcasting system. 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 enters the channel after passing through the band-pass filter and power amplifier. The receivi...

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Abstract

The invention discloses a composite transmission communication method of the analogue signal and the digital signal of a broadcast communication system, which comprises two parts of the composite sending of the analogue signal and the digital signal, and the reception and demodulation of composite information, wherein the composite sending of the analogue signal and the digital signal comprises the steps of source coding, channel coding, carrier wave formation and base band modulation; the carrier wave formation comprises: directly changing the wave form of the carrier wave by using binary information code element. The modulated wave form f1 (t) generated when the information bit is 1 and the modulated wave form f0 (t) generated when the information bit is 0 have adjustable small difference compared with standard sine waves. The reception and demodulation of the composite information comprises the steps of demodulation of analogue speech signals, demodulation of digital signals, channel decoding and source decoding. The composite sending of the analogue speed signals and the high-speed digital information can be realized only by slightly changing the prior broadcast system.

Description

technical field [0001] The present invention is a composite transmission communication method of analog signal and digital signal based on equal-amplitude and equal-period modulation carrier, which can be applied to the broadcast communication system that needs to modulate the amplitude of the carrier. Background technique [0002] The current broadcasting system adopts the method of modulating the low-frequency voice signal to a higher frequency band to facilitate transmission. Take analog double sideband amplitude modulation (DSB-AM) with carrier reserved as an example. The carrier itself does not carry useful information, but consumes a lot of energy. Taking AM broadcasting as an example, the carrier only plays the role of a carrier, but occupies two-thirds of the total transmission power. If this part of the carrier can be fully utilized, it will also transmit useful information instead of wasting it in vain. The efficiency of the existing communication system can be gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H04L1/00
Inventor 张羽朱松盛殷奎喜闾国年
Owner NANJING NORMAL UNIVERSITY
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