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

Novel OFDM parameterized channel estimator

A channel estimator and parameter estimation technology, applied in the field of channel estimators, can solve problems such as high computational complexity and poor performance

Inactive Publication Date: 2008-11-19
BEIJING UNIV OF POSTS & TELECOMM
View PDF0 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of this scheme is poor under low signal-to-noise ratio. On the other hand, this scheme needs to perform eigenvalue decomposition and implement ESPRIT algorithm, which also leads to high computational complexity of this scheme.

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
  • Novel OFDM parameterized channel estimator
  • Novel OFDM parameterized channel estimator
  • Novel OFDM parameterized channel estimator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0030] The present invention will be described in detail below through the accompanying drawings and examples.

[0031] figure 1 It is the basic principle block diagram of OFDM system. It is assumed that an OFDM frame has N symbols and K subcarriers. At the transmitting end, the data bits are first mapped into signals in the signal constellation, and multiple parallel baseband signals are formed after serial-to-parallel conversion, and then undergo K-point inverse fast Fourier transformation (IFFT) to add a cyclic prefix (CP) of length G ) and then transmitted from the antenna; after the wireless fading channel, the CP is removed at the receiving end and fast Fourier (FFT) transform is performed, and finally the system detector uses the channel state information generated by the channel estimator to recover the original data from the baseband signal. In an actual system, the data bits can be coded and interleaved before being mapped, and correspondingly deinterleaved and dec...

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 parametric channel estimator for the orthogonal frequency division multiplexing (OFDM) communication system; the parametric channel estimator is characterized in that the receiver end firstly adopts a novel parameter estimator to estimate two types of channel parameters, including the path number and the time delay corresponding to each path; the whole channel coefficient is accurately estimated according to the estimated channel parameters; compared with the parametric channel estimator in the prior art, the parametric channel estimator provided by the invention not only can accurately estimate the channel under low signal-to-noise ratio, but also can reduce the computation complexity of the estimator effectively.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a channel estimator applied to an Orthogonal Frequency Division Multiplexing (OFDM) system. Background technique [0002] The mobile wireless communication system must overcome the inter-symbol interference caused by multipath delay extension. Equalization is a method to overcome inter-symbol interference, but with the continuous improvement of transmission rate, the equalization algorithm on multiple symbols is very complicated. OFDM is a transmission method that can effectively solve the problem of intersymbol interference. In practical applications, there are usually non-coherent OFDM systems and coherent OFDM systems. The non-coherent OFDM system does not require channel estimation, but compared with the coherent OFDM system, the system performance will be lost by about 3dB, and the information symbols must have a constant mode characteristic. Therefore, a cohe...

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
IPC IPC(8): H04L25/03H04L27/26H04B1/707H04L25/02
Inventor 刘元安刘思杨谢刚王飞飞唐碧华高锦春黎淑兰胡鹤飞刘凯明李莉袁东明张然然孙剑锋
Owner BEIJING UNIV OF POSTS & TELECOMM
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