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Distributed preprocessing method and system for multi-base-station multi-use downlink transmission

A multi-user, distributed technology, applied in the direction of transmission system, digital transmission system, radio transmission system, etc., can solve the problems of difficult information interaction and large amount of information transmission in the base station, so as to expand communication capacity, increase gain, and suppress interference Effect

Inactive Publication Date: 2012-10-03
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for multi-base station distributed MU-MIMO, each base station participating in the communication needs to obtain the channel information between each user and all base stations, and the transmission amount of the information is very large, which is a problem for the uplink channel and the interface between the base stations. Huge challenge, especially considering that the base stations are relatively far away, and it is difficult to achieve information exchange between these base stations

Method used

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  • Distributed preprocessing method and system for multi-base-station multi-use downlink transmission
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  • Distributed preprocessing method and system for multi-base-station multi-use downlink transmission

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Embodiment 1

[0061] Embodiment 1: It is used to illustrate the situation that two base stations and two users transmit a data stream downlink, and the distributed precoding of mode a and mode 1 is adopted.

[0062] Please refer to figure 1 and image 3 . In this embodiment, two base stations and two users are taken as an example to transmit one data stream, and the process of realizing downlink data transmission by adopting mode 1 and mode a distributed precoding is described.

[0063] User terminal MS1 receives precoding information from base stations BS1 and BS2, and the corresponding new precoding vector is W 11 and the precoding vector from BS2 to MS1 is W 21 .

[0064] In order to achieve coherent combination of the signals of this stream in the user terminal MS1, the precoding vector can be adjusted in the way a, that is, W 11 constant, θ 2 satisfy with H 11 W 11 have the same phase.

[0065] After the user terminal is adjusted, it needs to feed back information to the b...

Embodiment 2

[0067] Embodiment 2: It is used to illustrate the case where two base stations and two users transmit a data stream in the downlink, and the distributed precoding of mode b and mode 2 is adopted

[0068] Please refer to figure 1 and image 3 , in this embodiment, two base stations and two users are taken as an example to transmit one data stream, and the process of realizing downlink data transmission by adopting mode 2 and mode b distributed precoding is described.

[0069] User terminal MS1 receives precoding information from base stations BS1 and BS2, and the corresponding new precoding vector is W 11 and the precoding vector from BS2 to MS1 is W 21 .

[0070] In order to achieve coherent combination of the signals of this stream in the user terminal MS1, the precoding vector can be adjusted in the way b, that is, θ 1 , θ 2 Meet: H 11 W 11 ' with H 21 W 21 ' have the same phase.

[0071] After the user terminal is adjusted, it needs to feed back information to...

Embodiment 3

[0081] Embodiment 3: It is used to illustrate the situation that the downlink transmission data stream of three base stations and three users is a distributed precoding using mode b and mode 1

[0082] Please refer to figure 1 and image 3 . In this embodiment, taking three base stations and three users as an example, one data stream is transmitted, and the process of realizing downlink data transmission by adopting mode b and mode 1 distributed precoding is described.

[0083] User terminal MS1 receives precoding information from base stations BS1, BS2 and BS3, and the corresponding new precoding vectors are W 11 , W 21 and W 31 .

[0084] In order to realize coherent combining in the user terminal MS1, the precoding vector can be adjusted in mode b, that is, θ 1 , θ 2 and θ 3 Meet: H 11 W 11 , and H 31 W 31 ' have the same phase.

[0085] After the user terminal is adjusted, it needs to feed back to the base station again. Mode 1 can be adopted, that is...

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Abstract

The invention discloses a distributed preprocessing method for multi-base-station multi-use downlink transmission. The method comprises the following steps that: each control station participating in cooperation sends a measurement signal to each of K terminals, wherein K is more than or equal to 1; each terminal receives the measurement signal from each control station, generates measurement signal feedback information and sends the measurement signal feedback information to each control station participating in cooperation; each control station participating in cooperation receives the measurement signal feedback information from each terminal, calculates a pre-encoding matrix, generates pre-encoding information and sends the pre-encoding information to each terminal; each terminal receives the pre-encoding information from each control station, adjusts the information and feeds back the adjusted pre-encoding information to each control station; and each control station determines a pre-encoding matrix again according to the adjusted pre-encoding information fed back by each terminal, and a downlink signal is processed by the pre-encoding matrix and sent to the terminals, so that user data can be transmitted from downlink base stations to the terminals. According to the method, the performance of the whole network is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and in particular relates to a distributed preprocessing method and system for downlink transmission of multiple base stations and multiple users. Background technique [0002] The Multiple Input Multiple Output (MIMO) technology that uses multiple antennas at both ends of the transceiver to improve system performance has been widely used in various 3G / B3G / 4G systems. In the application field of MIMO technology, there are single-user MIMO (SU-MIMO) and multi-user MIMO (MU-MIMO). Among them, SU-MIMO is a one-to-one correspondence between the base station and the time-frequency resources of the user terminal, and the base station communicates with a single user terminal on a specific time-frequency resource through multiple antennas. In MU-MIMO, as the number of users increases, the base station communicates with multiple different user terminals simultaneously on the same time-freq...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L1/16
CPCH04B7/024H04L25/03904H04L5/0035H04B7/0417
Inventor 焦晓晓朱登魁
Owner ZTE CORP