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

Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode

A cascading loop and delay diversity technology, applied in diversity/multi-antenna systems, preventing/detecting errors through diversity reception, electrical components, etc., can solve the problem that the accuracy of channel estimation affects the detection of received signals, there is no clear description, channel Estimation difficulties and other issues, to achieve the effect of improving bit error rate performance, simple operation, and reducing complexity

Inactive Publication Date: 2008-10-29
ZTE CORP
View PDF0 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the SFBC+CDD diversity scheme, because CDD increases the frequency selectivity of the channel, it brings great difficulties to channel estimation
The accuracy of channel estimation directly affects the detection of received signals, thus affecting the performance of the entire wireless communication system.
In the current MIMO-OFDM system, there is no clear description of the channel estimation method using SFBC+CDD transmit diversity, and even the ideal channel estimation is directly used when discussing the performance of SFBC+CDD transmit diversity

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
  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode
  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode
  • Channel estimation method suitable for space-frequency encoding cascade cycle detention diversity mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0024] Considering the characteristics of SFBC and CDD, according to the corresponding relationship between the time and frequency domains, the delay in the time domain is equivalent to the phase shift in the frequency domain. Considering that the cyclic delay processing of the signal in the time domain is equivalent to the phase shift processing in the frequency domain, it can be obtained:

[0025] ψ ( kδ ) = e - j 2 π N kδ

[0026] Among them, δ is the delay amount selected by CDD, N is the number of points of inverse Fourier transform (IFFT), and k is the number of subcarriers.

[0027] The CDD p...

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 discloses a channel estimation method applicable to cyclic delay diversity mode of a space-frequency encoding cascade; wherein, adjacent two pilot frequencies on a same data stream are respectively positioned at an odd location and an even location of subcarrier. The pilot frequency at the odd location on the data stream is used for estimating an equivalent channel response at the odd location of an antenna while the pilot frequency at the even location on the data stream is used for estimating the equivalent channel response at the even location of the antenna. By adopting the channel estimation method of the invention, not only the bit error rate performance is improved, but also the complexity of the channel estimation is reduced, thus ensuring the accuracy of the channelestimation and improving the reliability of the whole communication system.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a channel estimation method suitable for space-frequency coding cascade cyclic delay diversity. Background technique [0002] The next generation of wireless communication systems will provide better voice quality and faster data transfer rates. However, the time-varying multi-path transmission environment, limited bandwidth resources and users' demands on services make it very difficult to realize the above requirements. An effective way to solve these problems is to adopt diversity technology. SFBC (space-frequency block codes, space-frequency coding) + CDD (cyclic delay diversity, cyclic delay diversity) was adopted by the third generation because it combines the characteristics of space-frequency coding and cyclic delay diversity and has no requirement for the number of antennas at the transmitting end. Mobile Communication System Standardization Organization (3 r...

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): H04B7/02H04B1/707H04L25/02H04L1/06
Inventor 赵琼
Owner ZTE CORP
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