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Information processing method and device using time domain pilot sequence in OFDM system

A pilot sequence, time domain technology, applied in the field of information transmission, can solve the problem of difficult time synchronization of chromatic dispersion channels

Inactive Publication Date: 2004-09-08
BEIJING SAMSUNG TELECOM R&D CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the previous synchronization method using pilot insertion, the synchronization estimation method can greatly improve the transmission efficiency of the OFDM system by using the unique cyclic characteristics of the existing OFDM symbols without introducing additional information. It is difficult to achieve precise time synchronization in dispersive channels

Method used

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  • Information processing method and device using time domain pilot sequence in OFDM system
  • Information processing method and device using time domain pilot sequence in OFDM system
  • Information processing method and device using time domain pilot sequence in OFDM system

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Embodiment Construction

[0077] 1. OFDM symbol format proposed by the present invention

[0078] figure 1 A conventional cyclic prefix (hereinafter denoted CP) based OFDM symbol format is described. exist figure 1 In the conventional OFDM symbol format shown, the FFT (or DFT) block 12 is located after the cyclic prefix 11, which acts as a guard interval of the OFDM symbol to eliminate inter-symbol interference (ISI) from the previous OFDM symbol.

[0079] Figure 2A The OFDM symbol format using the time-domain pilot sequence (hereinafter denoted by TP) of the redundant information structure proposed by the present invention is described. exist Figure 2AIn , the TP block is composed of a TP sequence, and the TP block 21 is placed at the front of each OFDM symbol, followed by the CP block 22, and the TP block 21 and the CP block 22 replace the figure 1 The guard interval 11 is shown. exist Figure 2B In , a TP block consists of two or more back-to-back TP sequences. exist Figure 2C In , block...

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Abstract

The present invention proposes information processing method and device using time domain pilot sequence in OFDM system. The time domain pilot sequence is filled in the initial part of protecting interval of OFDM sign, and rest part of the protecting interval is filled with the circular prefix of OFDM sign, with FFT block being following the circular prefix. Or, the time domain pilot sequence is filled into the whole protecting interval of each OFDM sign, and FFT block follows the protecting interval. The time domain pilot sequence has self-correlation or periodical self-correlation characteristic, equal amplitude or nearly equal amplitude spectrum characteristic, and length of second power. For sake of system design and according to the features of TP sequence, the present invention proposes some transceiving system, time deviation estimation, carrier deviation estimation and channel estimation method and device based on TP sequence characteristic and OFDM sign structure characteristic.

Description

technical field [0001] The present invention relates to the field of information transmission in an Orthogonal Frequency Division Multiplexing (hereinafter referred to as OFDM) system, in particular to an information processing method introducing a time domain pilot sequence (Time domainPilot sequence) (hereinafter referred to as TP) in the OFDM system and based on the A transceiving device of the method, and a method and device for time offset estimation, carrier offset estimation and channel estimation using time-domain pilot sequences in an OFDM system. Background technique [0002] OFDM is a robust communication technique for efficient information transmission in a channel. This technology utilizes multiple parallel sub-carriers (sub-carrier frequencies) that transmit low-rate data to achieve high-data-rate communications. The technical point is to divide the channel transmission bandwidth into several sub-bands, transmit data information in parallel on each sub-band wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30H03M13/23H04B1/76H04J11/00H04L7/00H04L27/32
Inventor 廖敬一王海周判渝卢贞敏曹锋铭郑旭峰朴东植李贤愚
Owner BEIJING SAMSUNG TELECOM R&D CENT
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