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8QAM modulation method and system thereof

A modulation method and signal source technology, applied in modulation carrier system, transmission system, multi-carrier system, etc., can solve the problems of poor transmission performance and high lock threshold.

Inactive Publication Date: 2016-10-05
深圳市统先科技股份有限公司
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Problems solved by technology

[0004] In view of this, the object of the present invention is to provide an 8QAM modulation method and its system, aiming to solve the problems of high lock-in threshold and poor transmission performance in the prior art

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  • 8QAM modulation method and system thereof
  • 8QAM modulation method and system thereof
  • 8QAM modulation method and system thereof

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Embodiment Construction

[0031] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] The specific embodiment of the present invention provides a kind of 8QAM modulation method, mainly comprises the following steps:

[0033] S11. Encode the digital signal generated by the signal source to form encoded data;

[0034] S12. Convert the serial bit stream of the encoded data into a horizontal component and a vertical component through 8QAM bit constellation point mapping;

[0035] S13. Correspondingly modulate the converted horizontal component and the vertical component on two mutually orthogonal carrier waves by using an amplitude modulation method to form an orthogonal modulat...

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Abstract

The invention provides a 8QAM modulation method comprising the steps that digital signals generated by a signal source are coded so as to form the coded data; the serial bit stream of the coded data is converted into horizontal components and vertical components through 8QAM bit constellation point mapping; and the converted horizontal components and the vertical components are correspondingly modulated on two mutually orthogonal carriers by using an amplitude modulation mode so as to form orthogonal modulation signals. The invention also provides a 8QAM modulation system. According to the technical scheme, the total number of bit errors of a transmission system of which the spectral efficiency is equal to 3bit / s / Hz is enabled to be minimized so that the performance of the whole digital communication system can be enhanced.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to an 8QAM modulation method and a system thereof. Background technique [0002] In the field of digital communication, signals generally need to be modulated before being sent out. Quadrature Amplitude Modulation (QAM) is a modulation method, and data signals are represented by amplitude changes of two mutually orthogonal carrier waves. QAM is a kind of vector modulation. The input bits are first mapped (usually using Gray code) to a complex plane (constellation) to form complex modulation symbols, and then the I and Q components of the symbols (corresponding to the real and imaginary parts of the complex plane) , that is, the horizontal and vertical directions) are amplitude modulated, and are respectively modulated on two carrier waves (sum) that are orthogonal to each other (orthogonal in time domain). QAM is a technology of amplitude and phase joint modulation. It uses the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/36
CPCH04L27/366
Inventor 余佳李名
Owner 深圳市统先科技股份有限公司
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