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Data transmission method for C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing

A data transmission method and compressed sensing technology, applied in the field of wireless mobile communication, can solve the problem of reducing the amount of interactive information and achieve the effect of improving system capacity

Active Publication Date: 2016-07-27
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Compared with the post-precoding method, the amount of interactive information between the BBU and RRU is reduced in the pre-precoding method, and the requirements for transmission bandwidth are also reduced, but it still brings huge pressure on the existing transmission network

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  • Data transmission method for C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing
  • Data transmission method for C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing
  • Data transmission method for C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing

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Embodiment Construction

[0023] The implementation examples of the present invention will be described in detail below. This implementation case is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and specific process are given, but the implementation scope of the present invention is not limited to the described scene.

[0024] The data transmission method of the present invention is used in a C-RAN architecture massive MIMO single-cell system, the number of antennas of the RRU is M, the number of users in the cell is K, and KSub , the symbol rate is f Sym , each IQ data sampling bit is b IQ , the demodulated signal bit is b DS , the transmission bandwidth between BBU and RRU is φ. In this specific embodiment, M=400, K=200, N Sub =2048, f Sym =1 / (66.7us),b IQ =40bits,b DS =7bits, φ=49.1Gbps.

[0025] For this embodiment, the data transmission method of the massive MIMO system based on the C-RAN architecture provided by the pres...

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Abstract

The invention provides a data transmission method for a C-RAN (C-Radio Access Network) architecture massive MIMO (Multi-Input Multi-Output) system based on compressed sensing. The method comprises the following steps: a centralized baseband processing unit (BBU) vectorizes a channel matrix H obtained by channel estimation to obtain a channel vector h; the BBU carries out random measurement using the channel vector h to obtain a measurement vector y in a compressed sensing model; the BBU sends the measurement vector y and a data symbol vector s to each remote radio unit (RRU); the RRU obtains a channel matrix reconstruction signal H^ according to the received measurement vector y and a compressed sensing algorithm; the RRU calculates a pre-coding matrix W using the channel matrix H^; and the RRU carries out pre-coding using the pre-coding matrix W and the data symbol vector s, and calculates a sending signal vector x. According to the method, channel state information is compressed by adopting a compressed sensing method, reconstructed and then pre-coded, so that the capacity of the system is greatly improved under the condition that the transmission bandwidth between the BBU and the RRU is limited.

Description

technical field [0001] The invention belongs to the wireless mobile communication technology, in particular to the data transmission technology of a large-scale MIMO system based on a C-RAN architecture of a wireless access network. Background technique [0002] Multiple-input multiple-output technology MIMO refers to using multiple transmitting antennas and receiving antennas at the transmitting end and receiving end respectively, so that signals are transmitted and received through multiple antennas at the transmitting end and receiving end, thereby improving communication quality. It can make full use of space resources and double the system channel capacity without increasing spectrum resources and antenna transmission power. Massive MIMO means that the number of antennas can reach hundreds, which can increase system capacity to a greater extent and save transmission energy at the same time. [0003] The radio access network C-RAN composed of a cooperative wireless netw...

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Application Information

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IPC IPC(8): H04B7/04
CPCH04B7/046
Inventor 袁强杨海芬李广军杨全校尹腾飞郑植林水生阎波
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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