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Multi-carrier transmitting system and method with frequency-domain pilot signal and hidden pilot signal

A technology of pilot signal and transmission system, which is applied in the field of multi-carrier transmission system and its signal processing, and can solve the problems of limited and decreased performance of the receiving system

Inactive Publication Date: 2006-04-12
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In fact, the DVB-T receiving system only uses this pilot signal to perform channel equalization and frequency domain synchronization, resulting in limited and degraded performance of the receiving system

Method used

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  • Multi-carrier transmitting system and method with frequency-domain pilot signal and hidden pilot signal
  • Multi-carrier transmitting system and method with frequency-domain pilot signal and hidden pilot signal
  • Multi-carrier transmitting system and method with frequency-domain pilot signal and hidden pilot signal

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Embodiment Construction

[0043] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] The DVB-T system for Europe has the following characteristics:

[0045] 1) Using the COFDM modulation method;

[0046] 2) In addition to the non-layered signal transmission mode and the layered transmission mode, it also additionally supports the non-layered hybrid transmission mode, and adopts a different frame structure in each mode;

[0047] 3) In addition to 2K and 8K modes, 4K mode is also supported; and

[0048] 4) It has synchronization in the frequency domain, which is used to realize the synchronization between the sending end and the receiving end.

[0049] image 3 A schematic block diagram of a DVB-T transmission system using the COFDM method is shown.

[0050] The DVB-T transmission system includes a splitter 100 , a FEC (Forward Error Correction) unit 200 and an OFDM modulator 300 .

[0051] The separator 100 separates...

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Abstract

PURPOSE: A COFDM(Coded Orthogonal Frequency Division Multiplexing) transmitting system adding a pilot signal to a frequency domain and a signal processing method thereof are provided to set the pilot signal inserted in the frequency domain very low, thereby improving receiving efficiency and having compatibility with an existing system. CONSTITUTION: An FEC(Forward Error Correction) unit codes signals of a frequency domain for a receiving party to detect and correct an error. A mapping unit(310) maps the coded signals of the frequency domain by using a predetermined mapping method. A frame forming unit(320) inserts a first pilot signal to the signals of the frequency domain and forms OFDM frame signals formatted according to transmission modes. A pilot insertion unit(330) adds a second pilot signal having a relatively small size compared with an average size of the OFDM signals of the frequency domain to the OFDM frame signals. An IFFT(Inverse Fast Fourier Transform) unit(340) performs IFFT for the OFDM frame signals of the frequency domain to transform the IFFTed frame OFDM signals into OFDM signals of a time domain. A GI(Guard Interval) insertion unit(350) inserts a GI in the OFDM signals of the time domain.

Description

technical field [0001] The present invention relates to a digital broadcasting system, more specifically, relates to a multi-carrier transmission system using OFDM (Orthogonal Frequency Division Multiplexing) and a signal processing method thereof, which can improve receiving performance. Background technique [0002] OFDM is a multi-carrier modulation method with good performance in multi-path and mobile receiving environments. [0003] The OFDM method uses multiple carriers orthogonal to each other to increase frequency utilization efficiency. The OFDM method is suitable for high data rate transmission when a multi-carrier method is used for wired or wireless channels. When the single-carrier method is used to transmit high-speed data with short symbol intervals through a wireless communication channel with multipath fading, the complexity at the receiving end increases dramatically because inter-symbol interference becomes severe. [0004] Multiple mutually orthogonal c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N7/015H04J11/00H04L27/32H04B1/76
CPCH04J13/0022H04L1/0042H04L27/2634H04L27/26134H04L27/2605
Inventor 朴赞燮
Owner SAMSUNG ELECTRONICS CO LTD