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

Pilot channel estimating system and estimating method for uplink multi-user code domain

A channel estimation and pilot channel technology, applied in the field of data communication, can solve problems such as co-channel interference and low complexity, and achieve the effect of improving anti-interference performance and complexity performance

Inactive Publication Date: 2008-04-23
ZTE CORP
View PDF0 Cites 19 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] There are two main problems in the design of channel estimation: one is the selection of pilot information, due to the time-varying nature of the wireless channel, the receiver needs to track the channel continuously, so The pilot signal must also be continuously transmitted; the second is the design of a channel estimator with low complexity and good pilot tracking ability
[0007] In the frequency domain orthogonal pilot scheme, since the pilots between different users in the same cell are completely orthogonal, when there are many users in the same cell, the performance Relatively good, but the co-channel interference at the edge of the cell is serious

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
  • Pilot channel estimating system and estimating method for uplink multi-user code domain
  • Pilot channel estimating system and estimating method for uplink multi-user code domain
  • Pilot channel estimating system and estimating method for uplink multi-user code domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0085] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0086] Figure 1-A is the block diagram of the code-domain pilot channel estimation system for the single-user system; Figure 1-B It is a block diagram of the code-domain pilot channel estimation system of the multi-user system.

[0087] like Figure 1-A and Figure 1-B As shown, the upper part is the transmitter that transmits the pilot signal that is orthogonal to the code domain, and the lower part is the receiver that receives the pilot signal that is orthogonal to the code domain.

[0088] figure 2 It is a block diagram of the subframe structure of the DFT-S OFDM system.

[0089] like figure 2 As shown, in the DFT-S OFDM system, a complete frame structure includes 20 subframes of 0.5ms, and each subframe is composed of 6 Long Blocks and 2 Short Blocks, where the ShortBlock is used to transmit reference signals, Long Block is used 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

The receiver includes the receiving antenna, the frame decomposition module (FDM), DFT-S OFDM demodulation module, and channel estimation disturbance elimination module (CEDEM). The receiving antenna is in use for receiving time domain radio signal of pilot signal with orthogonal code domain. FDM carries out decomposing sub frame for received signal in time domain so as to obtain time domain pilot signal with orthogonal code domain separated out from sub frame signal. DFT-S OFDM demodulation module demodulates the received time domain pilot signal. The demodulated pilot signal is sent to CEDEM. Removing out multi-user disturbance and multipath disturbance, CEDEM outputs user channel response in time domain or in frequency domain. The invention also discloses the system for estimating channel of pilot signal in up going multi-user code domain.

Description

technical field [0001] The invention relates to a data communication technology, in particular to an uplink multi-user code domain pilot channel estimation system and estimation method of a DFT-SOFDM system in 3GPP LTE. Background technique [0002] In wireless communication, the acquisition of channel information is very important, almost all practical wireless communication systems use some form of channel estimation technology without exception. Adaptive channel equalizer uses channel information to counteract the influence of ISI; diversity technology uses channel estimation to achieve a receiver that best matches the received channel signal; maximum likelihood detection minimizes errors at the receiving end through channel estimation. Another important benefit of channel estimation is that it enables correlated demodulation. Therefore, channel estimation is an essential and important part in any wireless communication system. [0003] Channel estimation is divided int...

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): H04L25/02H04L27/26
Inventor 张峻峰郁光辉
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