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

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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 s

Method used

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

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] Example one,

[0026] See figure 1 , The flow chart of the data transmission method in the first embodiment of the present invention is as follows:

[0027] Step 101: Compare link performance of different modulation and coding combinations;

[0028] The different modulation and coding combinations may be high-order modulation low-rate combinations and low-order modulation high-rate combinations under the same data rate, or a set of several modulation and coding combinations composed of modulation and coding combinations under different data rates . Comparing link performance may be to compare parameters that characterize the link performance of the modulation and coding combination, and compare the link performance of different modulation and coding combinations by comparing the parameters of the 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 codin...

Example Embodiment

[0032] Embodiment two

[0033] See figure 2 , Is a flowchart of the data transmission method in the second embodiment of the present invention, which can be as follows:

[0034] Step 201: Randomly generate a set number of real-time channels;

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

[0036] Step 202: Traverse the generated instant channels of the MCS subcarriers corresponding to the same DR to obtain the corresponding subcarrier signal-to-noise ratio;

[0037] Since multiple instant channels are generated, the sub-carriers of the MCS corresponding to the same DR need to go through each instant channel respectively, and the corresponding sub-carrier signal-to-noise ratio of each instant channel is obtained respectively. The sub-carrier signal-to-noise ratio is equivalent to AWGN ( The effective sub-carrier signal-to-noise ratio under the Additive...

Example Embodiment

[0058] Embodiment three

[0059] See image 3 Is a flow chart of the data transmission method in the third embodiment of the present invention, which can be as follows:

[0060] Step 301: Randomly generate a set number of real-time channels;

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

[0062] Step 302: Traverse the generated instant channels of the subcarriers of the MCS corresponding to the same DR to obtain 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 go through each instant channel separately, and the magnitude of the attenuation change of the subcarrier corresponding to each instant channel is obtained.

[0064] It should be noted that the magnitude of the subcarrier attenuation change is only related to t...

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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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