Method for adaptively regulating modulation encoding mode based on CINR

Abstract

The present invention provides a method for adjusting modulation coding mode based on CINR self-adaption. The method comprises the following steps: computing multi-frame average value of CINR measured values, eliminating the abnormal values of CINR measured values according to the multi-frame average value, and using the average value of residual frames after eliminating the abnormal values as CINR statistic; preventing the fluctuation of chosen modulation coding mode when the CINR statistic falls in the CINR threshold junctions corresponding to two adjacent grade modulating coding modes, wherein the modulation coding mode of each grade is respectively provided with an exit threshold CINR_THfloor which is switched to low order, a least entering threshold CINR_THin and an exit threshold CINR_THceiling that is switched to high order and the switching area between the modulation coding modes of adjacent grades; and dynamically adjusting the CINR threshold corresponding with each modulation coding mode according to the block-error rate BLER. Thereby the system stability and communication quality are ensured when the bandwidth is fully used and the spectrum efficiency is increased.

Description

technical field [0001] The present invention relates to a link adaptive adjustment method in a communication system, in particular to a method for adjusting the modulation and encoding method according to the carrier-to-interference-and-noise ratio CINR (carrier-to-interference-and-noise ratio). Block rate BLER (block error rate) is a method of dynamically modifying the CINR threshold corresponding to each modulation and coding method. Background technique [0002] In a wireless communication system, the channel quality is constantly changing. The basic idea of ​​link adaptive technology is to adaptively adjust the parameters of signal transmission according to the current channel environment. The basic parameters that can be adjusted include modulation mode and coding mode. The gain of system channel capacity obtained by adaptive technology is very obvious, and this adaptive technology has been widely considered as one of the important means to effectively improve spectrum ...

AI Technical Summary

Problems solved by technology

[0004] The traditional adaptive modulation and coding scheme uses BLER to dynamically modify the adjustment amount of the CINR threshold to a fixed value. If the relative adjustment amount between the upper and lower CINR thresholds corresponding to a certain modulation and coding method is large, the adjustment speed will be too slow, which may reduce the Spectrum efficiency may reduce communication quality; if the range between the upper and lower thresholds of CINR corresponding to a certain modulation and coding method is close to the adjustment amount, the adjustment speed will be too fast, which may reduce system stability

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