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

Averaging circuit for enhancing channel estimation in receptor and compensating frequency offset residue

A technology of equalization circuit and frequency offset, applied in the direction of shaping network, channel estimation, electrical components, etc. in the transmitter/receiver, which can solve the problem of inaccurate estimation of the channel impulse response.

Active Publication Date: 2006-10-18
VIA TECH INC
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the channel impulse response H k The estimated value of is not precise enough, and the signal X k will not fully reflect the value of the signal at the transmit end

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
  • Averaging circuit for enhancing channel estimation in receptor and compensating frequency offset residue
  • Averaging circuit for enhancing channel estimation in receptor and compensating frequency offset residue
  • Averaging circuit for enhancing channel estimation in receptor and compensating frequency offset residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0077] Figure 4 It is a block diagram of an equalization circuit 400 with channel estimation and correction function according to the present invention. The equalization circuit 400 includes a channel estimation and equalization module 450 and an error estimation module 470 . Channel estimation is similar to the equalization module 450 image 3 The channel estimation and equalization module 300, but the equalization circuit 400 adds an error estimation module 470 to improve the accuracy of channel estimation. The error estimation module 470 uses a hard decision algorithm to generate a hard decision estimate of the equalized signal, which is fed back to the channel estimation and equalization module 450 to improve the estimation accuracy of the next channel impulse response.

[0078] First, the Fast Fourier Transform module 212 performs Fast Fourier Transform to convert the signal samples on the kth subcarrier into a frequency-domain signal Y k , k represents the label of t...

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

An equalization circuit for an OFDM baseband receiver, comprising: a channel estimation and equalization module for compensating channel distortion of a first signal according to an impulse response to obtain a second signal; a residual frequency offset compensation module, coupled to the channel estimation and equalization module, for estimating the offset phase caused by the residual frequency offset, and compensating the second signal according to the offset phase to obtain a third signal; and an error estimation module, coupled to the residual frequency offset compensation module, for generating an error estimation value according to the third signal and its hard decision estimation value, and feeding back the error estimation value to the channel estimation and equalization module , so that the channel estimation and equalization module corrects the estimated value of the channel impulse response of the first signal at a next time point sample.

Description

technical field [0001] The present invention relates to an Orthogonal Frequency Division Multiplexing (OFDM) system, in particular to an OFDM baseband receiver conforming to the IEEE 802.11a or IEEE 802.11g standard. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a modulation technique used in wireless networks conforming to standards such as IEEE802.11a or 802.11g. OFDM disperses data on several sub-carriers for transmission, and each sub-carrier is separated by a certain frequency. Due to the orthogonality of the data transmitted on the sub-carriers, they will not interfere with each other. Since the data is distributed and transmitted, the time available for transmitting data symbols on each carrier is extended, thereby reducing inter-symbol interference (inter symbol interference). Therefore, OFDM technology is popular in communication systems with high bit transmission rates. [0003] In the IEEE 802.11a standard, the carrier frequ...

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): H04L27/26H04L25/03
CPCH04L25/0202H04L25/03292H04L27/2601H04L2025/03414
Inventor 高凯鹏陈添辉
Owner VIA TECH INC
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