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

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...

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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 wireless communication system. The block error rate of data transmission, using the block error rate to correct the encoding and modulation mechanism, to solve the problem of misjudgment of channel conditions and affecting data transmission in the existing technology of adaptive adjustment

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