Method of and apparatus for computation of unbiased power delay profile

一种功率延迟分布、延迟分布的技术，应用在电气元件、传输系统等方向，能够解决低估、残留偏移影响等问题

Inactive Publication Date: 2007-02-07
TELEFON AB LM ERICSSON (PUBL)
View PDF0 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this approach severely underestimates σ g 2
Since the noise floor is not fully removed, significant residual offset effects remain

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
  • Method of and apparatus for computation of unbiased power delay profile
  • Method of and apparatus for computation of unbiased power delay profile
  • Method of and apparatus for computation of unbiased power delay profile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] Embodiments of the present invention allow for a given N w An offset-free center-of-gravity position estimate is computed in the case of a set of power delay distribution values. A center-of-gravity position estimate is computed from the subset of power delay profile values. This subset can for example be N p maximum peak value. Before calculating the center of gravity position estimate, from N p peaks to remove noise floor components. The noise floor power is calculated by averaging a subset of the power delay profile values. The subset of power delay distribution values ​​may be N n minimum value. A noise scaling factor γ is introduced in the center of gravity position estimation. The noise scaling factor that converts the offset noise floor power into an offset-free value is based on the probability distribution of the noise components and based on N w , N p and N n to calculate. As a result, the calculated center-of-gravity position estimate is substantia...

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

A method of determining a noise-corrected power delay profile includes determining a power delay profile and calculating a noise-corrected power delay profile. The step of calculating the noise-corrected power delay profile includes using a biased noise-floor power estimate, the power delay profile, and a noise-scaling factor.

Description

technical field [0001] The present invention relates to digital radio communication systems in which the delays of multipath components of a time-varying fading channel are to be estimated. The digital wireless communication system may include, for example, a system using Code Division Multiple Access (CDMA) RAKE receivers. In particular, the invention relates to improving the robustness of detection of new multipath components in a radio propagation channel and tracking of known paths by reliably indicating a suitable location for a path searcher window. Background technique [0002] In wireless communication, a physical channel is formed between a transmitter and a receiver through a radio link. In most cases, the antenna of the transmitter is not strictly aimed at the receiver. Besides the possible direct path, there are often many other propagation paths between the sender and receiver. These other propagation paths typically result from reflections from objects near ...

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): H04B1/707
CPCH04B1/7113H04B1/7117
Inventor 安德烈斯·雷亚
Owner TELEFON AB LM ERICSSON (PUBL)
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap