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

Circulation delay diversity signal channel estimation method, a system and equipment

A technology of cyclic delay diversity and channel estimation, which is applied in the field of cyclic delay diversity channel estimation, can solve the problem of large error in CDD channel estimation, achieve the effect of increasing frequency selection performance and solving inaccurate channel estimation

Inactive Publication Date: 2010-08-11
HUAWEI TECH CO LTD
View PDF0 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Embodiments of the present invention provide a method, system and device for cyclic delay diversity channel estimation, which solves the problem of large CDD channel estimation errors. The technical solution is as follows:

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
  • Circulation delay diversity signal channel estimation method, a system and equipment
  • Circulation delay diversity signal channel estimation method, a system and equipment
  • Circulation delay diversity signal channel estimation method, a system and equipment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] An embodiment of the present invention provides a CDD channel estimation method, see figure 1 , the method includes:

[0041] 101: Obtain the delay value of the selected cyclic delay diversity CDD;

[0042] Among them, the transmitting terminal selects the delay value δ of cyclic delay diversity CDD, and generally selects the delay value δ of cyclic delay diversity CDD as N FFT / 2 or N FFT / 4, where N FFT is the number of Fourier transform points.

[0043] 102: According to the delay value of the selected CDD, the channel parameter of the pilot position is extracted, and the channel parameter is linear;

[0044] Wherein, the receiving terminal extracts the channel parameters of the pilot position according to the delay value δ of the CDD selected by the transmitting terminal, including:

[0045] Divide all channel parameters into channel parameters at odd positions and channel parameters at even positions, since δ is N FFT / 2 or N FFT / 4, so the channel parameter...

Embodiment 2

[0053] In order to increase the accuracy of CDD channel estimation and further improve system performance, an embodiment of the present invention provides a CDD channel estimation method, which solves the problem of inaccurate channel estimation by changing the channel parameters of CDD into linear values, wherein the present invention implements In the example, δ takes N FFT / 2, take 2 transmit antennas as an example for illustration, see figure 2 , the specific implementation process is as follows:

[0054] 201: Receive a CDD frequency domain signal, and obtain channel parameters corresponding to the frequency domain signal;

[0055] Among them, see image 3, assuming that the transmitted signal is S(k) (power is 1, E(|S(k)| 2 =1), copied to 2 channels after OFDM modulation, the first channel is not delayed, the second channel is cyclically delayed by δ sampling points, and sent on the corresponding antenna after adding CP, then the received frequency domain signal is: ...

Embodiment 3

[0073] In order to increase the accuracy of CDD channel estimation and further improve system performance, an embodiment of the present invention provides a CDD channel estimation method, wherein, in the embodiment of the present invention, STBC (Space Time Block Coding, Space Block Coding) technology / SFBC ( Space Frequency Block Coding (Space Frequency Block Code) technology and CDD technology combined channel estimation scheme, δ takes N FFT / 2, take 4 transmit antennas as an example for illustration, see Figure 7 , the specific implementation process is as follows:

[0074] 301: Receive a CDD frequency domain signal, and obtain channel parameters corresponding to the frequency domain signal;

[0075] Among them, see Figure 8 , there are 4 transmitting antennas at the transmitting end, using the structure diagram of STBC / SFBC+CDD.

[0076] Assuming that the transmitted signal is S(k) (power is 1, E(|S(k)| 2 = 1), divided into two paths through the STBC / SFBC matrix, and...

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 embodiment of the invention discloses a circulation delay diversity signal channel estimation method, which comprises the following steps: obtaining the delay value of the selected circulation delay diversity CDD; extracting signal channel parameters in the pilot frequency position according to the delay value of the selected CDD, wherein the signal channel parameters are in linear distribution; and obtaining all signal channel parameters according to the extracted signal channel parameters. At the same time, the embodiment of the invention also provides a circulation delay diversity signal channel estimation system and equipment. Through the technical scheme provided by the invention, the signal channel parameters of the CDD signal channels are converted into the linear values, the problem of inaccurate signal channel estimation can be solved, and the frequency selection performance of the signal channel is added.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, system and equipment for cyclic delay diversity channel estimation. Background technique [0002] In an OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) system, in order to obtain multipath diversity gain, a CSD (Cyclic Shift Diversity, cyclic shift diversity) technology is used. Since the phase shift operation on each subcarrier of the CSD technology is equivalent to a cyclic shift in the time domain, it is also called CDD (Cycle Delay Diversity, cyclic delay diversity). [0003] The CDD technology is usually applied in a flat channel environment, and the frequency selectivity of the channel is increased by artificially adding a cyclic shift diversity technology. For channels of multiple frequencies, parameters of other frequency channels in the system need to be estimated according to parameters of certain frequency chann...

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): H04L25/02H04L27/26
Inventor 赵印伟李琦郑创明
Owner HUAWEI TECH CO LTD
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