Multiplex method of channel in digital audio broadcasting
A digital audio broadcasting, channel technology, applied in the direction of digital transmission system, multiple use of transmission path, electrical components, etc., can solve the problems of affecting business logic channel reception, interruption of business reception, bandwidth waste, etc., to maintain flexibility and efficiency performance, improve efficiency and reduce interference
Active Publication Date: 2013-04-10
CHINA RADIO INT +2
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Problems solved by technology
Once the multiplexing control table on the control channel changes, it will cause the control logical channel to be received again, which will interrupt the service reception on the current service logical channel, that is, the update of the multiplexing control table will affect the reception of the service logical channel
[0004] Secondly, using one time slot to transmit the control information table also brings waste. Usually, when one time slot is used to transmit business data, it can support 140Kbps transmission, but the bandwidth required to transmit the control information table per second is only a few Kbps. This results in a waste of bandwidth
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[0028] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
[0029] The digital audio broadcasting system is a digital broadcasting system that works in the traditional analog FM broadcasting frequency band (87MHz~108MHz), and realizes the broadcasting of digital audio broadcasting services and data services through digital coding and modulation technology. The channel multiplexing method of digital audio broadcasting of the present invention adopts the orthogonal multi-carrier OFDM technology in the physical layer, and divides different transmission channels according to the sub-carriers in the fr...
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The invention discloses a multiplex method of a channel in a digital audio broadcasting. The information transmitted on a digital audio broadcasting communication channel is divided into a business descriptor and a business data. The business descriptor is packed in a first multiplex frame mode to form a control multiplex frame. The business data is packed by a second multiplex frame to form a business multiplex frame. A business descriptor channel and a business data channel are provided in each logic frame to respectively bear one control multiplex frame and one or more business multiplex frame. According to the multiplex method of the channel in the digital audio broadcasting, multiplex flexibility and high efficiency of the business can be kept, and complete separation between the control communication channel and the business communication channel is achieved. The interference from the control communication channel to the business communication channel is reduced, at the same time, parallel receiving of the control communication channel and the business communication channel is further achieved, the support from a system to a dynamic communication channel and a dynamic business is increased, pay expenses of a control business are reduced, and multiplex efficiency is further improved.
Description
technical field [0001] The invention relates to the fields of communication and digital audio broadcasting, in particular to a channel multiplexing method in digital audio broadcasting. Background technique [0002] The function of multiplexing in the field of communication is to complete the encapsulation and arrangement of information such as video and audio, data, and electronic service guides, so that they can be transmitted on the transmission channel. In previous digital multimedia broadcasting systems, such as the CMMB China Mobile Multimedia Broadcasting System, a time-slot multiplexing method is adopted. The main features of this method include: dividing each broadcast channel transmission frame into 40 time slots, numbered TS0 to TS39, where TS0 is used as a control logical channel, and TS1~TS39 are used as service logical channels; several consecutive time slots form a multiplexing frame, and all time slots of this multiplexing frame use the same physical layer co...
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IPC IPC(8): H04L5/00
Inventor 王联朱雨涵黄继舟王万春雷文曹晓卫
Owner CHINA RADIO INT