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An adaptive cooperative transmission method in a cellular mobile communication d2d system

A technology of cellular mobile communication and cooperative transmission, applied in the field of cooperative transmission, can solve the problems of quantization error, performance degradation, information delay, etc. between system channel information and real channel information

Active Publication Date: 2017-06-09
SOUTHEAST UNIV
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Problems solved by technology

This scheme will lead to a certain quantization error between the system channel information obtained by the base station and the real channel information, and the size of this quantization error is determined by the capacity of the feedback link
In addition, when the feedback mechanism is used, there is also the problem of information delay caused by the feedback link, that is, the feedback information obtained by the base station is not the channel information at the current moment, but the channel information before a certain delay
Under the influence of the above factors, the downlink information obtained by the base station does not completely match the real channel information, resulting in a significant decline in the performance of the adaptive transmission scheme based on ideal channel information. Adaptive switching between MR and IC cooperative modes under the condition of channel information

Method used

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  • An adaptive cooperative transmission method in a cellular mobile communication d2d system
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  • An adaptive cooperative transmission method in a cellular mobile communication d2d system

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with the accompanying drawings. like figure 1 As shown, an adaptive cooperative transmission method based on delay feedback in a cellular mobile communication system supporting device-to-device communication of the present invention is implemented as follows:

[0054] (1) The system investigates the average moving speed of the user terminal in the cell to calculate the Doppler frequency offset, and then calculates the channel delay correlation coefficient according to the Clarke scattering model.

[0055] Doppler frequency offset f of cell user 0 communicating with the base station 0 =f c v 0 / c, the channel delay correlation coefficient is ρ 0 =J 0 (2πf 0 T s ), the Doppler frequency offset f of user 1 at the receiving end of the device-to-device communication link 1 =f c v 1 / c, the channel delay correlation coefficient is ρ 1 =J 0 (2πf 1 T s ), where c is the speed of light, f c repre...

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Abstract

The invention discloses a self-adaptation cooperative transmission method in a cellular mobile communication D2D system. The method is carried out in the following steps that firstly, Doppler frequency offset of users participating in cooperation in a cell is estimated, and a channel delay related coefficient is obtained; according to a scheduling algorithm, cell users and D2D users participating in cooperative transmission are determined, and a base station determines a transmission mode which will be used in cooperation; the users estimate channel information of themselves and feed the information back to the base station; at last, data transmission is carried out in a pre-coding scheme in a selected mode. The method can be effectively used in actual scenes; under the control of a core network, frequency resources of the cell users in the cellular mobile communication system are shared with users on the border of the cell so that data transmission from equipment to equipment can be carried out, cost of cell transmission capacity of the cellular communication system is reduced a little, the reachable transmission rate of the users on the border of the cell is improved greatly and accordingly an average frequency spectrum utilization rate in the cell is improved.

Description

technical field [0001] The invention belongs to the field of cooperative transmission in a mobile communication multiple-input multiple-output (MIMO) system, and relates to a cooperative transmission method in a cellular mobile communication system. Background technique [0002] In the cellular mobile communication system, users at the edge of the cell face the difficulty of low useful signal power and high interference signal power, which cannot effectively obtain high data transmission rates. A direct communication link is established between D2D) to effectively improve the data rate of cell edge users. In the existing cellular mobile communication environment, this D2D technology enables users located at the edge of the cell to directly establish links with neighboring terminals for data transmission by sharing the frequency resources of other users in the cell. Since the distance between the two users of D2D communication is very close, a higher data transmission rate c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04W72/04H04W72/12
Inventor 史锋峰许威沈弘赵春明
Owner SOUTHEAST UNIV
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