Adaptive modulation and coding method for wireless communication system and adaptive modulation and coding device for same

A wireless communication system, adaptive coding technology, applied in transmission systems, digital transmission systems, electrical components, etc., can solve problems such as affecting data transmission, adaptive adjustment errors, misjudging channel conditions, etc., to avoid errors in coding and modulation schemes. Select effects that affect data transmission and enhance data transmission performance

Active Publication Date: 2012-06-27
WUHAN HONGXIN TELECOMM TECH CO LTD
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  • Abstract
  • Description
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Problems solved by technology

[0003] In view of the problem in the prior art that misjudgment of channel conditions leads to errors in adaptive adjustment, the purpose of the invention of the embodiment of the present invention is to provide a new method and device for adaptive coding and modulation of a wireles

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  • Adaptive modulation and coding method for wireless communication system and adaptive modulation and coding device for same
  • Adaptive modulation and coding method for wireless communication system and adaptive modulation and coding device for same
  • Adaptive modulation and coding method for wireless communication system and adaptive modulation and coding device for same

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Embodiment 300

[0077] The foregoing content describes the method embodiments of the present invention in detail, and correspondingly, the present invention also provides corresponding device embodiments. See image 3 , The figure shows an apparatus embodiment 300 of the present invention. The apparatus 300 includes: a first obtaining unit 301, a second obtaining unit 302, a first judging unit 303, a second judging unit 304, a selection unit 305, and coding modulation Unit 306, where:

[0078] The first obtaining unit 301 is configured to obtain the current signal-to-noise ratio of channel transmission;

[0079] The second obtaining unit 302 is configured to obtain a block error rate of data transmission;

[0080] The first determining unit 303 is configured to determine whether the block error rate is greater than a first preset threshold, and if not, increase the signal-to-noise ratio offset, and the increase is the product of the preset step size and the up-regulation factor. The value range of...

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Abstract

An embodiment of the invention provides an adaptive modulation and coding method for a wireless communication system, which includes the steps: acquiring current signal-to-noise ratio and block error ratio of signal channel transmission; judging whether the block error ratio is larger than a first preset threshold value or not, if not, the block error ratio offset is increased, and the increasing quantity is a product of a preset step length and an up-regulated factor, and if yes, judging whether the block error ratio is larger than a second preset threshold value or not, and if the block error ratio is larger than the second preset threshold value, the signal-to-noise ratio offset is decreased, and the decreasing quantity is a product of the preset step length and a down-regulated factor; selecting a modulation and coding grade from a preset modulation and coding table according to a sum of the current signal-to-noise ratio and the signal-to-noise ratio offset; and performing modulation and coding according to selected modulation and coding grades corresponding to modulation and coding formats. By the aid of the embodiment of the adaptive modulation and coding method, the possible problems of adaptive modulation only depending on CQI (channel quality indicator) are avoided, and data transmission efficiency of an adaptive system is improved.

Description

Technical field [0001] The present invention relates to the field of wireless communication technology, and in particular to a coding and modulation method and corresponding device for a wireless communication system. Background technique [0002] Early wireless communication systems usually designed systems according to the worst channel conditions and the lowest standards, using high transmit power and low-order modulation to ensure communication quality. Even if the channel condition becomes better, the communication is carried out according to the worst condition of the channel condition, which greatly wastes wireless system resources such as frequency band, power, and capacity. To solve this problem, link adaptation technology has appeared. This technology adaptively adjusts transmission parameters according to channel changes after receiving channel state feedback information, so as to provide high transmission rate when channel conditions are good, and appropriately reduc...

Claims

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Application Information

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IPC IPC(8): H04L1/00
Inventor 牛桂新
Owner WUHAN HONGXIN TELECOMM TECH CO LTD
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