Channel state tracking method based on training sequence

A training sequence and channel state technology, applied in multi-frequency code systems and other directions, can solve problems such as affecting the receiving performance of the receiver and reducing the accuracy of channel estimation, and achieve the effect of avoiding low receiving performance and preventing receiving performance from being unstable.

Active Publication Date: 2011-05-25
MAXSCEND MICROELECTRONICS CO LTD
View PDF4 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for a mobile system with a large change, its propagation channel usually changes with the change of the surrounding environment. Once the channel power delay characteristics change, it will make the pre-set interpolation method and interpolation system in some The environment is not optimal, which reduces the accuracy of channel estimation and affects the receiving performance of the receiver

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 state tracking method based on training sequence
  • Channel state tracking method based on training sequence
  • Channel state tracking method based on training sequence

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0011] Channel characteristics in wireless mobile communication systems include multipath propagation, time delay spread, fading characteristics and Doppler effect, etc. In conjunction with the accompanying drawings, in order to illustrate the present invention more clearly, in the following embodiments, China Mobile Multimedia Broadcast (CMMB, China MobileMultimedia Broadcast) will be used as an example to illustrate, including the following steps:

[0012] Step 1. Obtain channel impulse response information according to known training sequences. The specific implementation method is:

[0013] A. According to the definition of the CMMB protocol, there are two synchronization signals with a length of 2048 at the beginning of each time slot signal. Except for virtual subcarriers, these two synchronization signals are mapped to 1536 effective signals on frequency domain subcarriers. The useful signal is a well-known training sequence for the receiver. Therefore, take any one o...

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 present invention discloses a channel state tracking method based on a training sequence, wherein the method is suitable for an OFDM system and comprises the steps of: (1) obtaining channel impulse response information according to a known training sequence; (2) determining a decision parameter according to the channel impulse response information, wherein the decision parameter is used for characterizing the channel characteristic; and (3) deciding the current channel type from a plurality of channel types supposed beforehand according to the decision parameter. By adopting the channel state tracking method based on a training sequence, an OFDM receiver has the capability of tracking channel change in mobile reception environment, and can correspondingly adjust the channel estimatingmethod according to the channel change, thereby ensuring that the receiver can work in a better working state under a plurality of channel environments. The channel state tracking method based on a training sequence of the invention is especially suitable for a wireless communication system designed for reception in the mobile environment.

Description

technical field [0001] The invention relates to the field of wireless signal transmission, in particular to a training sequence-based channel state tracking method applied to a wireless communication system. Background technique [0002] In a wireless communication system, during the transmission process, in addition to the direct signal on the straight path, the transmitted signal will usually be reflected by one or more reflective objects and then reach the receiver through different propagation paths. These signals propagated through different paths have different signal amplitudes and phases, and after arriving at the receiver with a small time difference, mutual interference causes fluctuations in received signal strength, resulting in signal distortion. This is the multipath effect of the wireless propagation channel. Multipath effects often prolong the time it takes for a transmitted signal to reach a receiver. Usually, the time when the first detectable signal arri...

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): H04L27/26
Inventor 程鑫豪金方其陈肯
Owner MAXSCEND MICROELECTRONICS CO LTD
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