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Method for sending preamble codes and synchronizing downlinks of terminal

A technology of preamble and main preamble, which is applied in the field of sending preamble and terminal downlink synchronization, which can solve the problem of long downlink synchronization process and achieve the effect of easy acquisition and elimination of frequency selective fading

Inactive Publication Date: 2010-01-27
GLOBAL INNOVATION AGGREGATORS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the terminal performs cross-correlation, it needs to perform multiple matches (for example, 114 times) before it can obtain cell and sector information, resulting in a long downlink synchronization process

Method used

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  • Method for sending preamble codes and synchronizing downlinks of terminal
  • Method for sending preamble codes and synchronizing downlinks of terminal
  • Method for sending preamble codes and synchronizing downlinks of terminal

Examples

Experimental program
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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] The method for sending the preamble of the present invention includes,

[0030] The base station sends a primary preamble and an auxiliary preamble, wherein time and frequency are synchronized by sending the primary preamble, cell identification is performed by sending the auxiliary preamble, and channel quality detection of a corresponding frequency band is performed.

[0031] The base station sends the auxiliary preamble on the entire system bandwidth, occupying the entire bandwidth of one symbol, and the auxiliary preamble is composed of multiple code regions in the frequency domain, where the base station sends the auxiliary preamble on the entire system bandwidth. Channel estimation is performed over the entire bandwidth.

[0032] Wherein, the code region constituting the auxiliary preamble includes multiple code regions of the sam...

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Abstract

The invention discloses a method for sending preamble codes and synchronizing downlinks of a terminal, which comprises that: a base station sends a main preamble code and an auxiliary preamble code, wherein the time and frequency are synchronized by sending the main preamble code; and cells are identified and channel quality detection are carried out on corresponding frequency bands by sending the auxiliary preamble code. By the method, the auxiliary preamble is divided into a plurality of code areas in a frequency domain, the influence of frequency selective fading can be eliminated, and frequency diversity is provided; the cells are identified by sending the combination of cell sub identification, namely the combination of preamble code subsequence identification in different code areas, so sufficient cell identification can be more easily acquired; besides, the plurality of code areas of the auxiliary preamble code adopt a preamble code subsequence mode, and channel measurement and estimation are facilitated aiming at different frequency bands.

Description

technical field [0001] The invention relates to the field of mobile communication, in particular to a method for sending a preamble and synchronizing a terminal downlink. Background technique [0002] Next-generation mobile communication systems such as mobile WiMAX are mainly based on the OFDMA (Orthogonal Frequency Division Multiple Access) multiple access method. Under a given system bandwidth, from the perspective of the frequency domain, different users occupy a certain The number of orthogonal subcarrier resources is used to achieve the purpose of multiple access. [0003] The IEEE 802.16e protocol stipulates that a preamble (preamble) is used to mark the beginning of a frame. The preamble occupies one symbol in time and is composed of subcarriers in the frequency domain. The pseudo-random sequence (PN sequence) is modulated on the subcarriers by BPSK method. And a PN sequence of one bit is modulated every three subcarriers. Preamble is sent over the entire bandwidth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W56/00H04B7/26
Inventor 方华
Owner GLOBAL INNOVATION AGGREGATORS LLC
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