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Method for lowering implicit feedback overhead by dynamic threshold under multiple user-multiple input multiple output (MU-MIMO)

A dynamic threshold and implicit feedback technology, applied in electrical components, digital transmission systems, error prevention, etc., can solve the problems of not considering user interruption, reduced spectrum utilization, high feedback overhead, etc., and achieve high cell average spectrum Utilization rate, reduction of feedback amount, effect of less capacity loss

Inactive Publication Date: 2011-03-23
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technical solution can greatly reduce the feedback overhead of users under the premise of ensuring the system capacity by selecting an appropriate SNR threshold value, this technical solution only considers the SU-MIMO (that is, all cooperative base stations only One user service) channel information feedback, which leads to a reduction in spectrum utilization, and does not take into account the interruption caused when the user does not feedback, and the feedback overhead is still relatively large

Method used

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  • Method for lowering implicit feedback overhead by dynamic threshold under multiple user-multiple input multiple output (MU-MIMO)
  • Method for lowering implicit feedback overhead by dynamic threshold under multiple user-multiple input multiple output (MU-MIMO)
  • Method for lowering implicit feedback overhead by dynamic threshold under multiple user-multiple input multiple output (MU-MIMO)

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] refer to figure 1 , the specific implementation steps of the present invention are as follows:

[0057] Step 1: Divide the serving cell where the user resides and select a coordinated multi-point cell.

[0058] 1a) Divide the serving cell where the user is located

[0059] According to the radius of the serving cell or the strength of the signal sent by the base station, the serving cell where the user is located is divided into a central area and an edge area.

[0060] figure 2 Describes the embodiment of dividing the serving cell according to the radius of the serving cell, wherein the radius of the serving cell is R meters, the range of the central area is 0-r meters, and the range of the edge area is r-R meters.

[0061] Dividing the serving cell according to the strength of the signal means that when the user receives the pilot signal sent by the serving base station or the received power is strong, it is determined that the user is located in the central area ...

Embodiment 2

[0103] Implementation effect of the present invention can be further illustrated by following simulation:

[0104] Simulation conditions:

[0105] In the simulation of the present invention, a downlink coordinated multi-point model should be constructed first. The cooperation model includes a serving base station and two cooperative base stations. When considering the system capacity and feedback amount when multiple users are in the edge area at the same time, the simulation parameters are selected as shown in Table 1:

[0106] parameter

value

Number of transmit antennas

8

Number of receiving antennas

2

Number of cells

3

Total number of physical resource blocks

48

bandwidth

10MHz

number of codebooks

4

Transmit power on each physical resource block

50mw

noise power

75mw

[0107] channel

Rayleigh channel

Cell radius

500m

edge area

...

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Abstract

The invention discloses a method for lowering implicit feedback overhead by dynamic threshold under multiple user-multiple input multiple output (MU-MIMO), belonging to the technical field of wireless communication. The method comprises the following steps: (1) dividing a serving cell and a multipoint cooperation cell; (2) after a user detects pilot frequency information, representing channel state information with a signal to noise ratio; (3) selecting an optimal physical resource block; (4) setting outage probability to screen users, and obtaining the dynamic threshold; (5) carrying out thedynamic threshold judgment on the optimal physical resource block; (6) distributing the physical resource blocks by a dispatching algorithm; (7) feeding the channel information back to a serving basestation by the users; and (8) dispatching the information according to the fed channel information by the serving base station. Under the MU-MIMO, the user feedback overhead can be greatly reduced byselecting the optimal physical resource block and setting the dynamic threshold on the premise of basically not influencing the system capacity, and the method is widely applicable for complex network systems and occasions with large user service amount.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method for reducing downlink multi-point coordinated implicit feedback overhead with a dynamic threshold under MU-MIMO. Background technique [0002] In the next-generation mobile communication Long Term Evolution (LTE-A) system, in order to solve the problem of large amount of user feedback information and inaccurate feedback accuracy under the coordinated multi-point architecture in the wireless network, various feedback compression mechanisms are used to reduce downlink CoMP implicit feedback overhead. For example, the technical solution disclosed in the patent application "Method for Reducing Downlink Coordinated Multi-point Implicit Feedback Overhead" (Application No. 201010013573.X). [0003] In order to meet the performance index of LTE-A, especially the performance requirement of LTE-A for cell edge users, this technical solution performs channel state i...

Claims

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Application Information

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IPC IPC(8): H04W72/12H04L1/06H04L1/00
Inventor 杨清海吕潇潇吕磊傅丰林
Owner XIDIAN UNIV
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