Adaptive modulation-demodulation control device and method

An adaptive modulation and control device technology, applied to electrical components, orthogonal multiplexing systems, multiplexing communications, etc., can solve problems such as large error codes, unfavorable system implementation, and transmission interruption

Inactive Publication Date: 2005-09-14
INFORMATION TECH LAB
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Problems solved by technology

[0002] In a general communication system, using a fixed modulation mode can ensure correct data transmission when the channel conditions meet the transmission requirements, but when the channel quality deteriorates, the transmission is interrupted due to too many errors; the existing self-adaptive The modulation and demodulation scheme selects the appropriate modulation mode according to the channel quality, but the algorithm is too complicated when evaluating the channel quality, which is not conducive to system implementation

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  • Adaptive modulation-demodulation control device and method
  • Adaptive modulation-demodulation control device and method
  • Adaptive modulation-demodulation control device and method

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[0019] Other purposes, characteristics and advantages of the present invention can be better understood through the detailed description of the embodiments of the adaptive modulation and demodulation control device and its implementation method according to the present invention below in conjunction with the accompanying drawings.

[0020] see figure 1 Describe the structure of the adaptive modulation and demodulation control device of the present invention. Such as figure 1 As shown, the adaptive modulation and demodulation control device is composed of a signal error estimator 101 , a forward error detection decision unit 102 , and an adaptive modulation and demodulation decision unit 103 . Among them, the signal error estimator 101 is used to estimate the error between the actual signal and the decision signal; the forward error detection decision unit 102 is used to check whether there is an error in the decoded bit stream; the adaptive modulation and demodulation decisio...

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Abstract

This invention puts forward an adaptive modem control device for regulating the modulation mode of each sub-carrier in channels with different S / N ratios for OFDM communication system and a method. Said device includes a signal error calculator, a forward error detection decider and an adaptive modulation / demodulation decider, said control device can apply high order modulation mode when the channel quality is good to increase channel transmission data rate and apply low order modulation mode when the quality is poor to ensure continuous communication.

Description

technical field [0001] The present invention relates to a method and system for digital wireless communication, in particular to an adaptive modulation and demodulation control method for communication quality in an Orthogonal Frequency Division Multiplexing (OFDM) communication system, and a wireless communication using this method for communication device. Background technique [0002] In a general communication system, using a fixed modulation mode can ensure correct data transmission when the channel conditions meet the transmission requirements, but when the channel quality deteriorates, the transmission is interrupted due to too large a bit error; the existing self-adaptive The modulation and demodulation scheme, selects the appropriate modulation mode according to the channel quality, but the algorithm is too complicated when the channel quality is evaluated, which is not conducive to the system implementation. Contents of the invention [0003] The purpose of the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J11/00H04L27/01
Inventor 赵继安孙勇王思业
Owner INFORMATION TECH LAB
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