Multiplex apparatus and multiplex method

A multiplexing device and frame multiplexing technology, which is applied in image communication, selective content distribution, electrical components, etc., can solve the problems of different probabilities and the decrease of transmission power of CMMB transmission system, so as to improve transmission power and effective coverage range effect

Inactive Publication Date: 2013-01-02
新奇点智能科技集团有限公司
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Problems solved by technology

[0005] However, from CMMB Standard Part 1 (CY / T 220.1-2006 Mobile Multimedia Broadcasting Part 1: Broadcast Channel Frame Structure, Channel Coding and Modulation) Page 5 figure 2 It can be seen from the physical layer functional block diagram shown in CMMB system that the physical layer stipulates that the scrambling process is performed after the constellation mapping. Therefore, in the 16QAM modulation mode, the effective data length of the multiplexing frame is relatively small When the short and filling part account for a large proportion of the entire multiplexing frame capacity, the distribution of "1" and "0" in the bit stream of the entire multiplexing frame is not random, resulting in a high probability of being mapped to each constellation point Not the same, resulting in a significant drop in the transmission power of the CMMB transmission system

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Embodiment Construction

[0022] Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

[0023] In the CMMB standard, such as figure 1 As shown, the multiplexed frame is composed of three parts: the multiplexed frame header, the multiplexed frame payload and the filling part. Among them, the structure of the multiplexing frame header is as follows figure 2 As shown; the multiplexed frame payload consists of one or more multiplexed subframes, including up to 15 multiplexed subframes; the padding part is filled with 0xFF. From figure 2 It can be seen from the figure that the multiplexing frame header includes fields such as the length of the multiplexing frame header, the number of multiplexing subframes, the length of each multiplexing subframe, next frame parameter indication and CRC. The CMMB multiplexing device in this embodiment achieves the effect of energy diffusion on the multiplexed frame by randomizing the data in the filling part in t...

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Abstract

The invention relates to a multiplex device and a multiplex method that support energy diffusion; the multiplex device comprises a multiplexer and an energy diffuser. The multiplexer multiplexes various data information into different logic channels to form a multiplex frame which comprises a multiplex frame header, a multiplex frame payload and a filling part. The energy diffuser conducts energydiffusion treatment to the filling part to randomize the data in the filling part. The multiplex device and the multiplex method that support energy diffusion of the invention can enhance the transmitting power of a CMMB transmitting system under the modulation of 16QAM, thus increasing the effective covering scope of a transmitting tower.

Description

technical field [0001] The invention relates to a mobile multimedia broadcasting technology, in particular to a multiplexing device and multiplexing method supporting energy diffusion. Background technique [0002] In the front-end system of CMMB mobile multimedia broadcasting, the function of the multiplexer is to complete the encapsulation and arrangement of audio, video, data, electronic service guide and other information, so that it can be transmitted on the mobile multimedia broadcasting channel. The output of the CMMB multiplexer is the multiplexing frame of each logical channel, carrying the corresponding service data. According to the CMMB standard, such as figure 1 As shown, a multiplexed frame is composed of a multiplexed frame header, a multiplexed frame payload and a padding part, wherein the padding part is filled with 0xFF (that is, a "1111..." character string). [0003] In the way of 16QAM constellation mapping, the power corresponding to the 16 constellat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N21/236H04N21/434
Inventor 张辉王西强李刚肖兵郭洛玮
Owner 新奇点智能科技集团有限公司
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