Communication method applying special coherent modulation/demodulation carrier signal

A technology for modulating carrier signals and carrier signals, which is applied in the direction of modulated carrier systems, phase-modulated carrier systems, digital transmission systems, etc., and can solve the problem of high cost

Inactive Publication Date: 2009-12-30
泉州天地星电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As we all know, a high-performance modulation and demodulation system relies on a large number of high-performance filters and processors on the hardware, and also uses various software technologies to implement complex algorithms, and its cost is very high
Therefore, it can be foreseen that, on the basis of existing technologies, it is quite difficult to substantially improve the performance of the modulation and demodulation system according to traditional methods.

Method used

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  • Communication method applying special coherent modulation/demodulation carrier signal
  • Communication method applying special coherent modulation/demodulation carrier signal
  • Communication method applying special coherent modulation/demodulation carrier signal

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Embodiment Construction

[0044] figure 1 It shows the principle of realizing multiplexing transmission by using the communication method using special coherent modulation and demodulation carrier signal provided by the present invention. Multiplexing transmission can greatly improve the transmission efficiency of the channel, and is currently the most widely used technology in communication. The multiplexing transmission illustrated in the present invention belongs to the multiplexing of frequency band grouping.

[0045] figure 1 in, f n (t) is the input signal, A1, A2...AN is the multiplier of the system modulator, S dn ％ (t) is the modulated carrier signal, S d (nt) is the demodulated carrier signal, B1, B2...BN is the multiplier of the system demodulator, C1, C2...CN is the integrator or low-pass filter of the demodulator, f n '(t) is the received signal.

[0046] According to the transmission requirements, demodulate the carrier signal S d (nt) In a variety of digital signals, signals of d...

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Abstract

The invention discloses a communication method of mod / demod carrier signal through specific coherent, which comprises the following steps: transmitting input signal of mod carrier signal of sending end into signal pattern fit for channel transmission; utilizing orthogonal demod carrier signal of mod carrier signal to transfer the received signal into original signal for receiving end. The invention possesses different pattern combinations with very simple frequency spectrum on the frequency region, which fits for encryption transmission of multi-path multiplying communication and multiple nested modulation / demodulation.

Description

technical field [0001] The invention relates to a communication method adopting coherent demodulation. The applied modulated carrier signal is obtained by special inverse transformation of the corresponding demodulated carrier signal, and the two are mutually orthogonal. Background technique [0002] Modulation and demodulation technology is an important link in modern communication, which determines the effectiveness, reliability, adaptability and economy of the communication system to a large extent. The so-called modulation and demodulation refers to the process of converting the signal to be transmitted into a signal form suitable for channel transmission at the sending end and converting the received signal into the original signal at the receiving end during signal transmission. [0003] Generally speaking, the modulation process is to make the amplitude, frequency, and phase of the modulated carrier signal change with the input signal. Demodulation is the inverse pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/18H04L27/227
Inventor 苏武浔魏腾雄
Owner 泉州天地星电子有限公司
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