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Data transmission method and apparatus

A technology of data transmission and data rate, which is applied in the field of data transmission, can solve problems such as MCS link performance is not optimal, and achieve the effect of improving versatility, adjusting quality and system performance

Active Publication Date: 2008-12-31
SHANGHAI HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] During the research and practice of the prior art, the inventor found at least the following problems in the prior art: when performing data transmission, according to the MCS selection scheme in the prior art, for some instant channels, the corresponding MCS chain The road performance is often not optimal, and there is no general MCS selection scheme in the existing technology

Method used

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  • Data transmission method and apparatus
  • Data transmission method and apparatus

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Experimental program
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Embodiment 1

[0026] see figure 1 , a flow chart of a data transmission method in Embodiment 1 of the present invention, specifically as follows:

[0027] Step 101, comparing the link performance of different modulation and coding combinations;

[0028] The different modulation and coding combinations may be high-order modulation low code rate combinations and low-order modulation high code rate combinations at the same data rate, or may be a set of several modulation and coding combinations composed of modulation and coding combinations at different data rates . Comparing link performance may be comparing parameters representing link performance of modulation and coding combinations, and link performances of different modulation and coding combinations are compared by comparing the parameters of link performance.

[0029] Step 102. According to the comparison result, select the modulation and coding combination with the best link performance among the modulation and coding combinations f...

Embodiment 2

[0033] see figure 2 , is a flow chart of the data transmission method in Embodiment 2 of the present invention, which may be as follows:

[0034] Step 201, randomly generating a set number of instant channels;

[0035] According to the specific situation, and for the objectivity of subsequent selection, the number of randomly generated instant channels can be set as large as possible.

[0036] Step 202, traversing the instant channel generated by the subcarriers of the MCS corresponding to the same DR, and obtaining the corresponding subcarrier signal-to-noise ratio;

[0037] Since multiple instant channels are generated, the subcarriers of the MCS corresponding to the same DR need to experience each instant channel respectively, and obtain the corresponding subcarrier signal-to-noise ratio of each instant channel respectively, and the subcarrier signal-to-noise ratio is equivalent to AWGN( Additive white Gauss Noise (Additive white Gauss Noise) The effective subcarrier sig...

Embodiment 3

[0059] see image 3 , is the flow chart of the third data transmission method in Embodiment 3 of the present invention, which may be as follows:

[0060] Step 301, randomly generating a set number of instant channels;

[0061] According to the specific situation, and for the objectivity of subsequent selection, the number of randomly generated instant channels can be set as large as possible.

[0062] Step 302, traversing the instant channel generated by the subcarriers of the MCS corresponding to the same DR, and obtaining the magnitude of attenuation change of the corresponding subcarriers;

[0063] Since there are multiple instant channels, the subcarriers of the MCS corresponding to the same DR need to experience each instant channel respectively, and obtain the corresponding subcarrier attenuation change amplitudes of each instant channel.

[0064] It should be noted that the magnitude of the subcarrier attenuation change is only related to the instant channel, and it r...

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Abstract

The embodiment of the invention discloses a method and a device for data transmission, wherein, the method comprises the steps that: the link performances of different modulation code combinations are compared; according to the results of the comparison, a modulation code combination with the best link performance is selected from the modulation code combinations so as to carry out data transmission. The device comprises a comparing unit used for comparing the link performances of different modulation code combinations; a selecting and transmitting unit used for selecting a modulation code combination with the best link performance from the modulation code combinations according to the results of the comparison so as to carry out the data transmission. During the data transmission, the technical proposal adopted by the embodiment of the invention selects a modulation code combination which is most suitable for the channel transmission by comparing the link performances of different modulation code combinations so as to carry out data transmission and can effectively increase the quality of data transmission and the performance of the system.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to data transmission technology. Background technique [0002] In wireless communication systems, channel coding and modulation are two basic modules of baseband digital signal processing. If R and m are used to denote the channel coding code rate and the modulation order respectively, then the data rate carried by each constellation symbol after modulation is DR=R*m(bit / symbol). In practical applications, based on different channel conditions and needs, a communication system often defines multiple DR (Data Rate, data rate) modulation and coding combinations, and each DR corresponds to two MCS (Modulation and Coding Set, Modulation and encoding combination), that is, the combination of high-order modulation low code rate and low-order modulation high code rate combination. For a DR, the system usually only selects a corresponding MCS. Table 1 shows the DR defined i...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L12/56H04L27/34
Inventor 邱赐云
Owner SHANGHAI HUAWEI TECH CO LTD
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