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Data sending method and system

A data transmission method and data technology, applied in digital transmission systems, transmission systems, multi-frequency code systems, etc., can solve problems such as adjustment of data transmission methods, and achieve the effect of ensuring quality, high throughput and peak rate

Active Publication Date: 2015-06-10
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a data transmission method and system to solve the defect that the existing system cannot make corresponding adjustments to the data transmission mode according to the different channel conditions on each frequency band

Method used

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  • Data sending method and system

Examples

Experimental program
Comparison scheme
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application example 1

[0072] like figure 2 As shown in , the base station sends a transmission block with a size of K bits to the user, and after being encoded with a turbo code with a code rate of R, encoded data with a length of N=K / R bits is generated.

[0073] The coded data is modulated and mapped to 2 OFDM symbols. like figure 2 As shown, the [0, f1) subcarriers constitute a sub-band, and the data on it adopts the 256QAM modulation method; the [f1, f2) sub-carriers constitute a sub-frequency band, and the data on it adopts the 64QAM modulation method; The data on the [f2, f3) subcarrier adopts the 16QAM modulation method, and the data on the [f3, f4] subcarrier adopts the QPSK modulation method, where 0, f1, f2, f3, and f4 are all subcarrier indexes .

[0074] After completing the modulation and mapping processing, the transmitting end forms a wireless frame with multiple continuous OFDM symbols and sends it to the receiving user.

application example 2

[0076] like image 3 As shown, the base station sends a transmission block with the size of Ki (i is the user index, i=1, 2,...) bits to the user. After being encoded by the LDPC code with the code rate Ri respectively, the generated lengths are respectively Ni= Ki / encoded data of Ri bits;

[0077] The coded data is modulated and mapped to Si OFDM symbols. like image 3 As shown, for transmission block 1, the [0, f1) subcarriers constitute a sub-frequency band, and the data mapped to it adopts 256QAM modulation; the [f1, f2) sub-carriers constitute a sub-frequency band, which is mapped to it The data mapped to the [f2, f3) subcarrier adopts the 16QAM modulation method, and the data mapped to the [f3, f4] subcarrier adopts the QPSK modulation method, where 0, f1 , f2, f3, and f4 are all subcarrier indexes. The insufficient part is filled with stuffing bits and then modulated and mapped together with the encoded data of the transmission block 1, so that the data of the tran...

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Abstract

Disclosed is a data sending method and system, said method comprising: coding each transmission block awaiting transmission; modulating the data obtained upon said transmission block coding, then mapping same onto an integer number of orthogonal frequency division multiplexing (OFDM) symbols, wherein, within the integer number of OFDM symbols, the modulation modes used for the data mapped onto each sub-band are not completely identical; and composing and sending to a receiving end a wireless frame composed of multiple continuous OFDM symbols. By means of the technical solution, the sending end flexibly adjusts the modulation mode of the data on each sub-band according to different channel conditions on each sub-band, effectively ensuring data transmission quality and obtaining an increase in adaptive coding and modulation; thus, higher throughput and peak value speed can be achieved.

Description

technical field [0001] The present invention relates to a mobile communication system, in particular to a data sending method and system. Background technique [0002] In mobile communication systems, due to the time-varying characteristics of wireless fading channels, there are a lot of uncertainties in the communication process. In order to improve the system throughput, high-order modulation with high transmission rate and less redundant error correction codes are usually used for communication, so that the system throughput is greatly improved when the signal-to-noise ratio of the wireless fading channel is ideal, but when the channel When it is in deep fading, it is impossible to ensure reliable and stable communication; in order to ensure the reliability of communication, low-order modulation with low transmission rate and large redundant error correction codes are usually used for communication, that is, when the wireless channel is in deep fading, it is guaranteed T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L27/26
CPCH04L1/0003H04L1/0009H04L5/0046H04L5/006
Inventor 许进郁光辉梁春丽郝鹏戴博吴欣
Owner ZTE CORP