Digital broadcast transmitter/receiver having an improved receiving performance and signal processing method thereof
a digital broadcast transmitter and receiver technology, applied in the field of digital broadcast transmitters/receivers and signal processing methods thereof, can solve the problems of poor receiving performance of equalizers, difficult to achieve existing equalizers b>220, and poor reception performance in an inferior channel environment, so as to improve the receiving performance of the system
Inactive Publication Date: 2009-04-23
SAMSUNG ELECTRONICS CO LTD
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Benefits of technology
The solution enhances the digital broadcast system's ability to mitigate multi-path fading and improve reception quality by utilizing the SRS for channel adaptation and error correction, leading to better synchronization and equalization performance even in adverse channel conditions.
Problems solved by technology
Thus, the system has the drawback in that it is weak in a multi-path fading channel environment having the Doppler effect.
However, according to the existing transport frame as shown in FIG. 2, since the field sync signal that is the reference signal of the equalizer 220 appears once for every 313 segments, its frequency is quite low with respect to one frame signal, and this causes the performance of equalization to deteriorate.
Specifically, it is not easy for the existing equalizer 220 to estimate the channel using a small amount of data as above and to equalize the received signal by removing the multi-path fading.
Accordingly, the conventional digital broadcast receiver has the disadvantages that its receiving performance deteriorates in an inferior channel environment, and especially in a Doppler fading channel environment.
Method used
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[0051]Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures. Also, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.
[0052]FIG. 3 is a view illustrating the structure of a general MPEG-2 transport stream packet. Referring to FIG. 3, the general MPEG-2 transport stream is composed of a TS header part of 4 bytes, and an adaptation field or payload data of 184 bytes. As shown, TS header part includes an 8 bit sync byte, a 1 bit transport error indicator, a 1 bit payload start indicator, a 1 bit transport priority indicator, a 13 bit packet identifier (PID), a 2 bit transport scrambling control, a 2 bit adaptation field control, and a 4 bi...
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A digital broadcast transmitting / receiving system, and a signal processing method thereof, includes a randomizer for randomizing a transport stream into a specified position of which stuff bytes are inserted, a stuff-byte exchanger for replacing the stuff bytes included in data output from the randomizer with specified known data, an RS encoder for performing an RS-encoding of data output from the stuff-byte exchanger, an interleaver for interleaving data output from the RS encoder, a trellis encoder for performing a trellis encoding of data output from the interleaver, an RS parity generator for generating a parity by performing an RS encoding of data output from the RS encoder, and outputting the generated parity to the trellis encoder, and a modulator / RF converter for modulating data output from the trellis encoder and performing an RF up-converting of the modulated data. The digital broadcast receiving performance can be improved even in an inferior multi-path channel by detecting the known data from the received signal and using the known data for synchronization and equalization in a digital broadcast receiver.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of U.S. patent application Ser. No. 11 / 475,098, filed Jun. 27, 2006, currently pending, which claims priority from U.S. Provisional Patent Application No. 60 / 739,430, filed on Nov. 25, 2005 in the United States Patent and Trademark Office, the disclosures of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Aspects of the present invention relate to a digital broadcast transmitter / receiver and a signal processing method thereof, and more particularly to a digital broadcast transmitter / receiver and a signal processing method thereof which can improve the receiving performance of the system by inserting a known sequence (also referred to as a “supplementary reference sequence (SRS)”) into a VSB (Vestigial Side Band) data stream and transmitting the data stream with the inserted known sequence.[0004]2. Description of the Related Art[0005]An ATSC (Adva...
Claims
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IPC IPC(8): H04N7/16H04N19/89
CPCH03M13/253H03M13/2936H04H60/07H04L1/0065H04N21/4382H04N21/23611H04N21/2383H04N21/4346H04L25/03286
InventorPARK, EUI-JUNKWON, YONG-SIKKIM, JOON-SOOYU, JUNG-PILJEONG, JIN-HEEJI, KUM-RANKIM, JONG-HUN
OwnerSAMSUNG ELECTRONICS CO LTD