Lead code detecting method of subscriber station receiver

A detection method and preamble technology, applied in multi-frequency code systems, multiplex communication, orthogonal multiplex systems, etc., can solve the problem of reduced applicability of SS receivers, inability to detect downlink preambles, etc. problem, to achieve the effect of improving accuracy, facilitating software implementation, and reducing the amount of detection calculation

Active Publication Date: 2010-06-02
WUHAN HONGXIN TELECOMM TECH CO LTD
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it can not detect the downlink preamble at the same time, making the applicability in SS receivers reduced

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
  • Lead code detecting method of subscriber station receiver
  • Lead code detecting method of subscriber station receiver
  • Lead code detecting method of subscriber station receiver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] Based on the characteristics of the 802.16e downlink signal, the present invention proposes an effective preamble detection and synchronization method, which can accurately detect the preamble by utilizing the good autocorrelation and cyclic prefix (CP) of the preamble, and at the same time realize the symbol Timing synchronization and frequency offset estimation, and has high computing efficiency, very suitable for implementation on digital signal processors (DSP) or embedded microprocessors.

[0026] The following steps are in figure 1 is shown in the flowchart.

[0027] An OFDMA symbol consists of two parts, the cyclic prefix (hereinafter referred to as CP) and the useful data part. The length of the cyclic prefix (cp_len) is generally pre-defined by the system, and the CP is the data copy of the useful data whose final length is cp_len. Coarse synchronization timing is accomplished by the CP correlation of OFDMA symbols. The baseband data received by the antenna is...

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 provides a lead pilot-code detection method of a user station receiver, which comprise the following steps: (1) each orthogonal frequency division multiplexing received by an antenna isaccessed OFDMA symbols, correlation energy corresponding to each sliding sample point, a symbol serial number corresponding to the maximum correlation energy and the sample point deviation, namely, frame header coarse synchronization position are recorded; (2) the frame header coarse synchronization position is taken as a symbol timing reference to estimate a decimal frequency offset; (3) the estimated decimal frequency offset is used to calibrate the frequency offset of each symbol; (4) a sector number of the lead pilot-code and a fine timing position are detected; (5) a cell identification number of the lead pilot-code is detected, a corresponding lead pilot-code is researched and acquired by using the sector number of the lead pilot-code detected by the step (4) and the cell identification number detected by the step (5). The method provides an important modulation parameter and symbol synchronization for SS receiver data modulation, which can greatly reduce the ID Cell detection calculation capacity and improve the accuracy of the lead pilot-code detection and the symbol synchronization as well as facilitate the achievement of software in practical application.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a preamble detection method of a user station receiver. Background technique [0002] WiMAX is a new generation of wireless broadband access technology based on the 802.16 protocol. It has the advantages of high data transmission rate, low complexity, and wide coverage. Many communication equipment manufacturers and operators in the world are actively developing, manufacturing and App activity. Recently, WiMAX has been absorbed by ITU-T as one of the official 3G standards, and a dedicated frequency band has been allocated. [0003] A subscriber station SS (Subscriber Station) is a terminal device relative to a WiMAX BS (Base Station, base station). Before the SS and the BS communicate normally, the SS needs to detect a preamble. According to the definition of 802.16e, the preamble is modulated on the first symbol of the downlink subframe, and each preamble is a p...

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 Patents(China)
IPC IPC(8): H04L27/26H04J11/00
Inventor 陈惠锋洪媛姜韬
Owner WUHAN HONGXIN TELECOMM TECH 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