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A intelligent ultra -surface channel estimation method and system based on space -based random samples

A random sampling and channel estimation technology, applied in the baseband system, channel estimation, baseband system components, etc., can solve the problem of high computational cost and achieve efficient channel estimation

Active Publication Date: 2022-03-29
武汉瑞斯通信科技有限公司
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Problems solved by technology

[0012] Aiming at the problems existing in the prior art, the present invention provides a method and system for channel estimation of an intelligent metasurface based on spatial random sampling, and in particular relates to a semi-passive intelligent metasurface (Reconfigurable Intelligent Surface, RIS) assisted wireless communication The channel estimation method and system in the system aim to solve the problem of excessive calculation overhead of traditional and existing channel estimation methods in RIS-assisted communication systems

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  • A intelligent ultra -surface channel estimation method and system based on space -based random samples
  • A intelligent ultra -surface channel estimation method and system based on space -based random samples
  • A intelligent ultra -surface channel estimation method and system based on space -based random samples

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Embodiment 1

[0116] Aiming at the problem of excessive calculation overhead of traditional and existing channel estimation methods in RIS-assisted communication systems, the present invention proposes a semi-passive RIS structure that can perform low-cost spatial random sampling, and the channel estimation proposed on this basis The algorithm can achieve higher channel estimation accuracy with less computational overhead. That is, the present invention provides a channel estimation method jointly designed by RIS software and hardware, which mainly includes:

[0117] Consider one such as image 3 In the situation where LOS is blocked in the communication link shown (which is likely to happen frequently in mmWave communication), in the scenario where RIS is used to provide an additional reflection path to assist in communication between transceivers:

[0118] 1) In the uplink, the multi-antenna UE transmits pilot series (including but not limited to ZC sequence, Gaussian sequence, QPSK sequ...

Embodiment 2

[0126] The present invention considers a large-scale semi-passive RIS-assisted broadband millimeter wave wireless communication system, where the LOS link is blocked by obstacles due to the high directivity and penetration loss of millimeter waves. At this time, if there is no RIS auxiliary communication, the system will be blocked. However, if the RIS is to exert the effect of assisting communication in real time, the present invention first tries to obtain the global CSI. In order to reduce hardware cost and energy consumption, the RIS designed by the present invention only contains a very small number of RF chains and single-bit quantized ADCs, which will be randomly connected to an equal number of RIS units through electronic switches under the control of the central controller superior. The system works in Time-Division Duplexing (TDD) mode, the uplink and downlink occupy the same bandwidth, and the number of subcarriers is N k , the carrier spacing is △f. In the syste...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses an intelligent metasurface channel estimation method and system based on spatial random sampling. The intelligent metasurface channel estimation method based on spatial random sampling includes: random sampling in space; controlling a small number of unit connections through electronic switches to the radio frequency link and baseband signal processing module; restore all the pilot signals received on the reflective panel through the matrix completion algorithm; estimate the channel state information through the compressed sensing algorithm, and the smart metasurface is based on the channel state information Reasonably adjust the reflection coefficient of the reflection unit to realize beamforming. The present invention greatly reduces the calculation overhead of the system in the channel estimation stage with lower RIS hardware cost by fully exploring the correlation properties of broadband electromagnetic wave signals, so that the channel estimation is more efficient and accurate.

Description

technical field [0001] The invention belongs to the field of wireless communication technology, and in particular relates to a method and system for channel estimation of an intelligent metasurface based on spatial random sampling. The intelligent metasurface is also called Large Intelligent Surface, Reconfigurable Intelligent Surface, Software Defined Surface, Meta-surface, IRS, IntelligentReflecting Surface, Reconfigurable Meta-Surfaces, Holographic MIMO, etc., are all expressed in RIS. Background technique [0002] At present, millimeter wave communication is one of the key enabling technologies in the future 5G / B5G and even 6G wireless communication networks. Theoretically, the well-designed wireless communication system of the present invention is likely to achieve higher system throughput by exploiting and utilizing the ultra-large bandwidth existing in the millimeter wave frequency band. However, in the current actual deployment, this advantage has not been fully uti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/02H04B7/0413
CPCH04L25/0228H04L25/024H04B7/0413
Inventor 胡江峰尹海帆
Owner 武汉瑞斯通信科技有限公司
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