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Large-scale MIMO system channel feedback method based on spatial- temporal correlation

A channel feedback, large-scale technology, applied in baseband system components, channel estimation, transmission system, etc., can solve the problems of reducing feedback load and occupying a large bandwidth, and achieve the effect of reducing feedback load and strong energy concentration

Active Publication Date: 2015-12-16
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of the prior art, and provide a channel feedback method for massive MIMO systems based on space-time correlation, which uses compressed sensing technology to combine the characteristics of time correlation and space correlation of channels, and is simple and easy to implement. The sparse basis transformation method does not require the transmitter to master the correlation matrix of the downlink channel, which can reduce the feedback load while ensuring the accuracy of channel feedback, and effectively solve the channel feedback load with the increase in the number of antennas in massive MIMO systems. The problem of taking up too much bandwidth

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  • Large-scale MIMO system channel feedback method based on spatial- temporal correlation
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  • Large-scale MIMO system channel feedback method based on spatial- temporal correlation

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0033] figure 1 It is a system block diagram of the massive MIMO system channel feedback method based on space-time correlation proposed by the present invention. The principle of the present invention is: the transmitting end sends the pilot signal to the receiving end through the transmitter, the receiving end receives the pilot signal through the receiver, and obtains downlink channel state information through channel estimation module estimation. The channel memory at the receiving end stores the downlink channel information of the last time slot. The current estimated channel information and the channel information of the last time slot in the channel memory are sent to the channel differentiator to obtain the difference between adjacent channels. This difference is fed into the compressive sensing processing module. The compressed sen...

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Abstract

The invention discloses a large-scale MIMO (Multiple-Input Multiple-Output) system channel feedback method based on spatial- temporal correlation. The method comprises the following steps that: 1, a receiving end obtains current time slot downlink channel condition information, and then calculates difference between adjacent time slot channels; 2, the receiving end compresses difference signals between the adjacent time slot channels by a compressive sensing technology, and feeds back to a transmitting end through an uplink feedback channel; 3, the transmitting end restores the currently received feedback signals, which are fed back to the transmitting end, through an orthogonal matching pursuit technology; 4, the transmitting end combines the previous time slot channel information with a restoring value of the current received feedback signals, and obtains the current time slot downlink channel condition information. According to the invention, the compressive sensing technology and the channel characteristics of temporal correlation and spatial correlation are used, by a simple and easy sparse change of base, the transmitting end is not required to master correlation matrixes of downlink channels, and feedback load can be reduced effectively under the premise of guaranteeing precision of channel feedback.

Description

technical field [0001] The invention belongs to the technical field of channel estimation and feedback in communication systems, and in particular relates to a channel feedback method for a massive MIMO system based on space-time correlation. technical background [0002] MIMO (Multiple-Input Multiple-Output) technology refers to the use of 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, realize multiple transmissions and multiple receptions through multiple antennas, and can double the system channel capacity without increasing spectrum resources and antenna transmission power. It has many advantages such as high power efficiency, and has become the next generation of mobile Communication is one of the core technologies ...

Claims

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Application Information

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IPC IPC(8): H04L1/06H04L25/02H04B7/04H04B7/06
CPCH04B7/0417H04B7/0621H04L1/0618H04L25/0204
Inventor 刘旭王士欣贾婷婷杨龙祥朱洪波
Owner NANJING UNIV OF POSTS & TELECOMM
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