Synchronous information sending method of OFDM system and cell searching method

A technology of orthogonal frequency division and transmission method, which is applied in the field of synchronous information transmission method and cell search, which can solve problems such as large amount of calculation, complex implementation, and long access time, and achieve shortened access time, accelerated search speed, and wide spectrum high efficiency effect

Inactive Publication Date: 2012-06-13
ZTE CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] According to the 802.16e standard: the preamble is sent on the entire bandwidth of the first symbol of the downlink. At the same time, 802.16e systems with different bandwidths (such as 5MHz, 10MHz, and 20MHz) use different preambles. In order to access the system, the terminal needs very The amount of calculation is large, and it is difficult for the terminal to work under systems with different bandwidths, so the existing technology brings problems of complex implementation and long access time

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
  • Synchronous information sending method of OFDM system and cell searching method
  • Synchronous information sending method of OFDM system and cell searching method
  • Synchronous information sending method of OFDM system and cell searching method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The technical solution of the present invention will be described in more detail below with reference to the drawings and embodiments.

[0042] The present invention provides a method for sending synchronous information of an OFDM system, the core idea of ​​which is to adopt hierarchical technology in the design of preambles; the method for sending preambles includes:

[0043] The base station sends system synchronization information to the terminal, the synchronization information includes a preamble and a broadcast channel; the preamble includes a primary preamble P-Preamble and an auxiliary preamble S-preamble; the base station puts the P-preamble in each In the first OFDM symbol of the first subframe of each radio frame, the broadcast channel is placed in the first OFDM symbol of the second subframe of each radio frame, and the S-preamble is placed in each radio frame In the second OFDM symbol of the subframe.

[0044] The P-preamble is modulated on useful subcarri...

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 sending method of synchronization signals of an orthogonal frequency division multiplexing system and a corresponding cell searching method. The synchronization signal sending method comprises the steps of transmitting system synchronization information to a terminal by a base station, wherein, the synchronization information comprises lead codes which comprise main lead codes and sub lead codes, and also comprises broadcast channels; modulating the main lead codes on a useful sub-carrier of a fixed bandwidth which is the minimum of the bandwidths used by each coexistence system; the base station sending sub lead codes with the types corresponding to the system used in the base station; the base station placing, the main lead codes, which carries information indicating the types of the sub lead codes, in the first orthogonal frequency division multiplexing symbol of the first sub-frame of each frame; placing the broadcast channels in the first orthogonal frequency division multiplexing symbol of the second sub-frame of each frame; placing the sub lead codes in the second orthogonal frequency division multiplexing symbol of each sub-frame. According to the present invention, many systems can be compatible with each other.

Description

technical field [0001] The invention relates to the field of digital communication, in particular to a synchronization information sending method and a cell search method of an orthogonal frequency division multiplexing system. Background technique [0002] As a multi-carrier transmission mode, OFDM (Orthogonal Frequency Division Multiplex) converts a high-speed transmission data stream into a set of low-speed parallel transmission data streams, making the system frequency-selective to multipath fading channels The sensitivity of OFDM is greatly reduced, and the introduction of cyclic prefix further enhances the ability of the system to resist Inter-symbol Interference (ISI). In addition, the high bandwidth utilization rate and simple implementation make OFDM in wireless communication Watershed applications are becoming more and more widespread, for example, WLAN systems, 802.16e systems based on Orthogonal Frequency Division Multiple Access, and 802.16m systems (fourth gene...

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): H04B7/26H04L27/26
Inventor 孙长印
Owner ZTE CORP
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