Unlock instant, AI-driven research and patent intelligence for your innovation.

Superspeed mobile environment LTE-V2V channel estimation and equalization method

An LTE-V2V, mobile environment technology, applied in the field of LTE Internet of Vehicles communication, can solve the problems of high Doppler and inability to cope, and achieve the effect of low complexity and performance improvement

Active Publication Date: 2018-01-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] These traditional channel estimation algorithms based on interpolation can no longer cope with such a high Doppler under the specific block pilot structure, so it is very urgent and necessary to design effective channel estimation and equalization algorithms

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
  • Superspeed mobile environment LTE-V2V channel estimation and equalization method
  • Superspeed mobile environment LTE-V2V channel estimation and equalization method
  • Superspeed mobile environment LTE-V2V channel estimation and equalization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0058] During the simulation, the signal is the transmission mode under the LTE standard 10MHz bandwidth, where the channel bandwidth is B=10MHz, the subcarrier spacing is Δf=15KHz, and the sampling rate of the signal is f s =15.36MSps, the channel codec adopts Turbo code. The simulated channel delay setting is: channel delay = [0 10 20 30 40] / f s , channel gain=[0 -3 -6 -8 -17.2]dB, Doppler frequency shift is set to 2800Hz. Interpolation scheme: Using the fitted pilot CIR, 2,5→3,4; 5,8→6,7; 8,11→9,10. Extrapolation scheme: use the pilot symbol 11 of the previous subframe and the pilot symbol 2 of the next subframe to interpolate 0, 1, 12, and 13. The basis function is set to Slepian, and the fitting order is 6. Channel equalization algorithm, frequency domain is one-tap (single tap) and MMSE, time domain is LSQR (least squares QR decomposition) and DampedLSQR (damped least squares QR decomposition).

[0059] image 3 Indicates the comparison curve between the CIR at the ...

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 present invention discloses a superspeed mobile environment LTE (Long Term Evolution)-V2V (Vehicle-to-Vehicle) channel estimation and equalization method. The method comprises: employing a discrete ellipsoid primary function channel estimation method to obtain CIR at a pilot symbol; based on the CIR at the pilot symbol, employing the discrete ellipsoid primary function to perform intra-subframe interpolation and inter-subframe extrapolation of the CIR at the pilot symbol to obtain CIR at a data symbol of a whole subframe; after the CIR of the whole channel is obtained, reconstructing a time-domain channel matrix through the CIR of a channel, solving the inverse of the time-domain channel matrix through iteration processing, each iteration being based on QR decomposition of the time-domain channel matrix, obtaining the optimum solution of each step through the least square method, and when iteration convergence is satisfied, obtaining an equalization processing result. The superspeed mobile environment LTE-V2V channel estimation and equalization method directly estimates time-domain channel CIR information to obtain more and more complete channel information, the complexity of equalization processing is low, and performances are greatly improved compared to a traditional channel equalization algorithm.

Description

technical field [0001] The invention belongs to the field of LTE (Long Term Evolution) Internet of Vehicles communication, and specifically relates to channel estimation and equalization technology in an ultra-high-speed mobile environment. Background technique [0002] In recent years, the demand for high-speed mobile Internet services has grown dramatically, and wireless communication technology for Internet of Vehicles has become a research hotspot. The Internet of Vehicles can not only improve the efficiency and safety of the road transportation system, but also meet the continuous growth of users' demand for data on the road. It has been confirmed that it will become an important scene for the new expansion of 5G. LTE is the most effective wireless broadband technology to provide high-speed and low-latency services for mobile terminal users, and because of its wide-area coverage of roadside equipment, especially the formulation of LTE D2D communication standards, LTE ha...

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 Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04W4/46
Inventor 刘光辉瞿辉洋易超王艳艳
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA