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Multiple modulation transmission method

A technology of multiple modulation and transmission methods, applied in transmission systems, digital transmission systems, modulated carrier systems, etc., can solve problems such as limiting the full utilization of sine waves and limiting the transmission rate.

Inactive Publication Date: 2010-05-26
BEIJING LIANGSANG COMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is this requirement of orthogonality that limits the full use of the three parameters of the sine wave, thus limiting the further improvement of the transmission rate.

Method used

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  • Multiple modulation transmission method
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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0074] (1) Multiple amplitude and phase modulation baseband transmission:

[0075] Its characteristics are described by the following formula: g b ‾ ( t ) = Σ h = 1 H g b ( t h ) = Σ h = 1 H f h ( 2 π T h ( t - τ h ) ) SIN 2 π T h (...

Embodiment 1

[0120] The one-way transmission of 1.28Mbps is realized on the frequency band of 0-80KHz by multiple amplitude-phase modulation baseband transmission method.

[0121] Signal: g b ‾ ( t ) = Σ h = 1 H g b ( t h ) = Σ h = 1 H f h ( 2 π T h ( t - τ h ) ) SIN 2 π T ...

Embodiment 2

[0124] The two-way transmission of 12.8Mbps is realized on the frequency bands of 240KHz-1.04MHz and 1.1MHz-1.9MHz by using multiple amplitude-phase modulation direct carrier transmission.

[0125] Signal: g cb ‾ ( t ) = Σ h = 1 H g cbh ( t ) = Σ h = 1 H f h ( 2 π T h ( t - τ h ) ) SIN 2 π T ...

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Abstract

The present invention provides a multi-modulation transmitting method which combines a plurality of independent sine waves into a composite wave which is a non-orthogonal multi-modulation symbol, wherein each of said independent sine waves is referred to as sub-wave, the amplitude, frequency and phase of said independent sine wave can be any value within the value range thereof, and each of said independent sine waves are non-orthogonal to each other; the composite wave is multi-point sampled; each sub-waves of said non-orthogonal multimodulation symbol are decomposed in order to realize datacommunication. It can improve the frequency utilization and signalnoise ratio greatly, which can in turn increase the transmit rate greatly.

Description

technical field [0001] The invention belongs to the technical field of digital communication; specifically, it is a multiple modulation transmission method. Background technique [0002] If baseband transmission is regarded as zero modulation, all digital communication signals must be modulated before being sent to the channel. The modulated signal is called a line code. The modulated signal in carrier transmission is a sinusoidal waveform. Increasing the types of waveforms can increase the number of bits (that is, the amount of information) carried by the modulated signal, and the transmission rate will increase. The change of sinusoidal waveform depends on the three parameters of amplitude, frequency and phase. Obviously, the more parameters that can be controlled simultaneously, the more types of waveforms can be generated. [0003] In existing modulation methods, at most two parameters are controlled simultaneously. For example: multi-carrier is to synthesize multip...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/00H03K12/00H04L27/24H04L27/26
CPCH04L27/24H04L27/2602H03K12/00H04L27/34
Inventor 梁德群
Owner BEIJING LIANGSANG COMM TECH