Method and device for sending and receiving system information in digital audio broadcasting system
A technology of digital audio broadcasting and system information, applied in the direction of digital transmission system, multi-frequency code system, transmission path separation device, etc., can solve the problems that the robustness cannot be guaranteed, cannot meet the requirements of digital audio broadcasting system, etc., and achieve increased Coverage, improved probability of correct decoding, effect of power boost
Active Publication Date: 2017-06-16
ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION +1
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Problems solved by technology
In the current digital broadcasting systems such as DVB-T, DRM, HD-Radio and CMMB, a more efficient system information transmission scheme has been selected, but its robustness cannot be guaranteed, so it cannot meet the requirements of the digital audio broadcasting system
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[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0025] The digital audio broadcasting system described in the embodiment of the present invention is a digital audio broadcasting system based on Coded Orthogonal Frequency Division Multiplexing (COFDM).
[0026] figure 1 It is a schematic diagram of the system information sending device in the digital audio broadcasting system of the present invention. see figure 1 , the sending device includes:
[0027] A cyclic redundancy check (CRC) encoder is used to input system information, perform cyclic redundancy check encoding, generate system codes including system information and check information, and output them to the channel encoder;
[0028] A channel encoder, configured to search for a corresponding encoded codeword in the codeword set according to the input systematic code, generate an encoded bit stream including redundant info...
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The invention discloses a method and device for transmitting and receiving system information in a digital audio broadcasting system. When transmitting, the system information is subjected to CRC encoding and channel encoding processing to generate a coded bit stream; the coded bit stream is subjected to bit interleaving processing and constellation mapping processing Obtain continuous pilots containing system information; multiplex the continuous pilot signals and other signal elements of the system into frequency domain signals of an orthogonal multiplexing structure according to the carrier allocation method specified in the spectrum mode; convert the frequency domain signals is a time-domain signal for transmission. When receiving, convert the time domain signal into a frequency domain signal; extract continuous pilots containing system information from the effective carrier of the frequency domain signal according to the position specified by the spectrum mode; use demapping, deinterleaving and channel decoding to obtain system information Estimated value; Use CRC decoding to judge the correctness of the system information and output the system information. The invention can improve the robustness of the transmission on the basis of ensuring the transmission efficiency of the system information.
Description
technical field [0001] The present invention relates to the technical field of digital audio broadcasting, in particular to a method for sending and receiving system information in a digital audio broadcasting system and a sending and receiving device. Background technique [0002] The digital audio broadcasting system has the characteristics of high spectrum utilization, wide coverage and rich program content. In order to provide better service quality and user experience, digital audio broadcasting usually supports multiple business modes including data services and audio services. [0003] The transmission and reception of system information (also called control information) in the digital audio broadcasting system plays a vital role in the normal operation of the system. System information usually includes important content such as the modulation and coding method of the main service, carrier allocation method, etc. Once the system information is wrong, it may cause the...
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IPC IPC(8): H04L27/26H04L1/00H04L1/06
CPCH04L5/0007H04L5/0053H04L5/0048H04L27/261H04L27/2626H04L27/2647H04L1/0041H04L1/0045
Inventor 邹峰李锦文陶涛吴智勇雷文邢观斌邸娜冯昂
Owner ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
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