Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A Time-varying Channel Parameter Estimation Method

A parameter estimation, time-varying channel technology, applied in channel estimation, propagation channel monitoring, transmission monitoring, etc., can solve problems such as Doppler frequency shift increase, OFDM system performance degradation, and channel estimation accuracy reduction.

Active Publication Date: 2020-12-15
HANGZHOU DIANZI UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, in a fast time-varying environment, the Doppler frequency shift increases, destroying the orthogonality between subcarriers and causing inter-carrier interference (Inter-Carrier Interference, ICI), which deteriorates the performance of the OFDM system and reduces the channel estimation. precision

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Time-varying Channel Parameter Estimation Method
  • A Time-varying Channel Parameter Estimation Method
  • A Time-varying Channel Parameter Estimation Method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0060] specific implementation plan

[0061] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0062] Step 1: The receiving end collects the signals received on the multi-antennas arranged in UCA (Uniform Circle Array), and the received signals can be expressed as

[0063]

[0064] In the formula, α l is the scattering coefficient of the lth diameter, a l is the receiving array response matrix of the lth path, f d is the Doppler frequency, T s is the sample period, θ l is the angle between the incident direction of the received signal and the horizontal direction, Send the signal for the time domain, d l is the correlation time delay of the lth path, and z(n) is Gaussian white noise.

[0065] Step 2: Construct the orthogonal subspace projection matrix, first define the spatial filter matrix,

[0066]

[0067] In the formula, β k is the average angle of the kth orthogonal subspac...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a parameter estimation method for a time-varying channel. The parameter estimation method comprises the following steps: firstly, a receiving terminal acquires a signal receivedon multiple antennae; secondly, constructing an orthogonal subspace projection matrix; thirdly, projecting the received signal onto subspaces which are mutually orthogonal by utilizing the orthogonalsubspace projection matrix; fourthly, performing channel estimation in each orthogonal subspace, so that a channel estimation parameter in each orthogonal subspace is obtained; fifthly, performing Doppler compensation on a channel impulse response estimated value in each orthogonal subspace; and sixthly, combining the channel impulse response estimated values in the orthogonal subspaces, so thata final channel estimation result is obtained. The time-varying channel estimation method based on orthogonal subspace projection can obtain a smaller channel estimation mean square error, and performance is improved.

Description

technical field [0001] The invention belongs to the field of receiving in a multi-antenna environment, and in particular relates to a time-varying channel parameter estimation method based on orthogonal subspace projection. Background technique [0002] With the development of high-speed railways, people travel more and more conveniently. At present, one of the railway construction goals is that more than 80% of the big cities can be covered by the high-speed railway network, and the travel time between Beijing and most provincial capital cities should be controlled within 2-8 hours. This also means that in this fast-paced society, people will be more willing to choose high-speed rail for travel. However, as China enters the 4G era, railway users' demand for communication is increasing day by day. The narrowband communication system GSM-R (GSM for Railways) used by high-speed railways can no longer meet users' broadband communication needs, such as video calls, conference ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H04B17/30H04B17/382H04L25/02
CPCH04L25/0202H04B17/30H04B17/382
Inventor 曾嵘黄强
Owner HANGZHOU DIANZI UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com