Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device

A technology of data detection and channel estimation, applied in multi-frequency code systems, baseband system components, etc., can solve problems such as increasing system complexity and increasing system transmission power

Inactive Publication Date: 2009-08-19
PLA UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method increases the transmission power of the system and increases the complexity of the system

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
  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device
  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device
  • Associated semi-blind channel estimating and data detecting method based on superimposed pilot and its device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0061] The basic idea of ​​the method of the present invention is: first, the useful signal at the sending end is superimposed on the known pilot symbol at the receiving end and then sent to the channel, and then at the receiving end, the correlation between the frequency domain channels of each sub-carrier is used to utilize the signal based on the reduced state The Soft Output Viterbi Algorithm (RS-SOVA) is a maximum likelihood criterion detector to estimate the frequency domain channel and detect useful signals. It includes: (1) superimposing pilot frequency at the sending end; (2) using RS-SOVA to estimate frequency domain channel and detect useful signal at the receiving end. In order to better understand the technical solution of the present invention, the downlink of the air interface technology WirelessMAN-OFDM stipulated in the IEEE802.16a standard is taken as an example for description below. The WirelessMAN-OFDM system uses 256 sub-carriers, and the carrier frequenc...

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 joint semi-blind channel estimation and data detection method based on superimposed pilots, which is characterized in that firstly at the transmitting end, the useful symbols are superimposed on the pilot symbols known at the receiving end and then sent to the channel, and then at the receiving end, each sub- The frequency domain correlation between the carrier frequency domain channels, the frequency domain channel is equivalent to a finite state machine; then, use the maximum likelihood criterion detector to detect useful symbols, use the detected useful symbols to perform LS channel estimation, and update the channel state machine to detect the next useful symbol.

Description

technical field [0001] The invention relates to a space-time orthogonal frequency division multiplexing (ST-OFDM) system used for estimating the frequency selective fading channel of the ST-OFDM system and detecting data at the same time, especially a joint semi-blind channel based on overlapping pilots The estimation and data detection method (Joint Semi-Blind Channel Estimation and Data Detection, JSBCEDD) belongs to the field of broadband wireless data transmission. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) is a technology that can effectively resist frequency selective fading. Combining space-time block coding (STBC) technology with OFDM can provide better system performance and higher data transmission rate for wireless communication systems. In coherent detection ST-OFDM systems, channel estimation greatly affects the performance of the entire communication system. In order to obtain the correct estimation of the channel, trainin...

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): H04L25/02H04L27/26
Inventor 杨炜伟蔡跃明李子吴启晖徐友云
Owner PLA UNIV OF SCI & TECH
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