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

Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision

A technology of wireless communication and wireless communication system, applied in the field of timing coarse synchronization, can solve the problems of multi-bit quantization false alarm, large dynamic range of filtering result amplitude, complex adaptive process of coarse synchronization threshold, etc., so as to reduce complexity and reduce operation. amount of effect

Inactive Publication Date: 2010-10-06
TSINGHUA UNIV
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large dynamic range of the filtering result after multi-bit quantization, the coarse synchronization threshold requires a relatively complex adaptive process; at the same time, for a communication system that uses data frames to achieve multi-user and multi-point access, due to the burstiness of data services and The interference of other users in the same frame makes multi-bit quantization often have false alarms

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
  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision
  • Method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017] Assuming that the data frame header is a 1024-point PSC code synchronization head, the concrete implementation steps of the present invention (attached figure 1 )for:

[0018] 1) 1-bit quantization: the receiving end uses 1-bit quantization for both the demodulated signal I and Q, that is, if the amplitude is greater than 0, it will be quantized as 1, otherwise, it will be quantized as -1, and the unit is based on the actual output amplitude of the 1-bit quantizer;

[0019] 2) Matched filtering: the quantized bit stream is matched with a 1024 point long PSC code matched filter;

[0020] 3) Hard decision: The hard decision threshold is fixed at 220 (the unit is based on the actual output amplitude of the 1bit quantizer). A comparator is used to compare the matched filtered signal amplitude with a hard decision threshold, and when a peak exceeding the threshold is encountered, it is considered that the synchronization head has been captured, and the rough synchronization...

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 relates to a method for achieving wireless communication timing coarse synchronization by using 1bit quantification and hard decision and belongs to the technical field of wireless mobile communication synchronization. The method is characterized by comprising the following steps that: a receiving end firstly carries out 1bit quantification on a demodulated signal; after being quantified, the signal is subjected to matched filtering by a matched filter; and a filtering result is directly compared with a fixed threshold value to search for a synchronous head so as to realize timing coarse synchronization. The scheme can effectively solve the false-alarm problem caused by the frequently and greatly faded signal under the multi-user and multipoint access condition by using a data frame. Meanwhile, the amplitude dynamic range of the filtering result is narrower, and the decision threshold value can be constant without self-adaptation. Moreover, after quantification, only 1bit information exists so as to effectively reduce calculated quantity and reduce the complexity of a synchronization module.

Description

technical field [0001] The invention belongs to the technical field of wireless mobile communication synchronization, and relates to a timing coarse synchronization method suitable for a wireless communication system. Background technique [0002] In wireless communication systems, the acquisition of timing synchronization is very important. The receiving end needs to overcome factors such as channel time selectivity, frequency selectivity, and other user interference to complete synchronization accurately, and then complete a series of follow-up operations such as FFT and channel estimation. Therefore, accurate synchronization is a prerequisite for completing follow-up work. Timing synchronization is usually completed by timing coarse synchronization and timing fine synchronization. The timing coarse synchronization is mainly used to detect the arrival of data frames, and the timing fine synchronization is mainly to detect the precise position of the frame header to determi...

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): H04W56/00H04L1/00
Inventor 周世东陈翔肖立民张秀军朱晋王京
Owner TSINGHUA UNIV
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