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Data transmitting method for movable multimedia system

A data transmission method and mobile multimedia technology, applied in the direction of time division multiplexing usage, radio/induction link selection arrangement, selection device, etc., can solve the problem that cannot meet the requirements of medium and large coverage, the length is short, and the echo signal cannot be resisted. And other issues

Inactive Publication Date: 2008-01-23
INNOFIDEI TECHNOLOGIES INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design flaw of this cyclic prefix is ​​that it is short in length and cannot resist long-delayed echo signals, making this mode only suitable for small SFNs
It cannot meet the requirements of medium and large coverage in some environments of SFN network

Method used

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  • Data transmitting method for movable multimedia system
  • Data transmitting method for movable multimedia system
  • Data transmitting method for movable multimedia system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0099] Referring to FIG. 5 , it is a schematic diagram of a frame structure of 38 time slots in the first embodiment of the present invention. In this solution, in order to design a longer CP length, two time slots are discarded, and the original 40 time slot structure is adjusted to 38 time slots. In the figure, the symbol length of the first time slot (TS) 0 is 26319.1 μs, and the symbol length of each time slot from time slot 1 to time slot 37 is 26315.7 μs. The first beacon (Beacon) length of time slot 0 is 452.7 μs, and the second beacon length of each time slot from time slot 1 to time slot 37 is 449.3 μs. OFDM data body length remains unchanged, still 409.6μs. In this way, the cyclic prefix (CP) length is extended to 76 μs.

[0100] The data sending method of the first embodiment of the present invention includes the following steps:

[0101] (1) each frame is divided into 38 time slots;

[0102] (2) In the 0th time slot, first send a first beacon with a length of 4...

Embodiment 2

[0109] Referring to FIG. 6 , it is a schematic diagram of a frame structure of 35 time slots according to the second embodiment of the present invention. In this scheme, in order to design a longer CP length, 5 time slots are discarded, and the original 40 time slot structure is adjusted to 35 time slots. At the same time, the synchronization signal length is adjusted from 204.8 μs to 409.6 μs. In the figure, the time slot length of time slot 0 is 28572.4 μs, and the length of each time slot from time slot 1 to time slot 34 is 28571.4 μs. The length of the first beacon (Beacon) of the time slot 0 is 861.6 μs, and the length of the second beacon of each time slot from the time slot 1 to the time slot 35 is 860.6 μs. OFDM data body length remains unchanged, still 409.6μs. In this way, the cyclic prefix length is extended to 110.8μs.

[0110] The data sending method of the second embodiment of the present invention includes the following steps:

[0111] (1) Divide each frame i...

Embodiment 3

[0118] Referring to FIG. 7 , it is a schematic diagram of the frame structure of 34 time slots according to the third embodiment of the present invention. In this solution, in order to design a longer CP length, 6 time slots are discarded, and the original 40 time slot structure is adjusted to 34 time slots. In the figure, the symbol length of time slot 0 is 29413.9 μs, and the symbol length of each time slot from time slot 1 to time slot 33 is 29411.7 μs. The first beacon length of time slot 0 is 452.3 μs, and the second beacon length of each time slot from time slot 1 to time slot 33 is 450.1 μs. OFDM data body length remains unchanged, still 409.6μs. In this way, the cyclic prefix (CP) length can be extended to 134.4μs.

[0119] The data sending method of the third embodiment of the present invention includes the following steps:

[0120] (1) each frame is divided into 34 time slots;

[0121] (2) In the 0th time slot, first send a first beacon with a length of 452.3 μs,...

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Abstract

The present invention discloses a data transmission method in a mobile multimedia system. In detail, each second of signal at a physical layer is one frame in the system and divided into N time slots. The method includes procedures below: (1) At a 0th time slot, it needs to firstly transmit a first beaconing and then 53 OFDM symbols; (2) From a first to N-1th time slot with N less than 40, it is proposed to firstly and respectively send a first beaconing and a second beaconing and then 53 OFDM symbols. The present invention is capable of realizing high-flexibility frequency programming and coverage area programming. A single frequency network with coverage scope of 16km and 50km can be built by selecting different frame structures and data transmission methods, thus effectively eliminating failure of standard GY / T 220.1-2006 to fulfill medium and large scope with a single frequency network.

Description

technical field [0001] The invention relates to the field of mobile multimedia broadcasting systems, in particular to a data sending method of a mobile multimedia system. Background technique [0002] The GY / T 220.1-2006 standard issued by the State Administration of Radio, Film and Television of China is the first part of the CMMB (ChinaMobile Mμltimedia Broadcasting, China Mobile Multimedia Broadcasting System) standard: broadcast channel frame structure, channel coding and modulation. [0003] Referring to FIG. 1 , it is a schematic diagram of a frame structure in the GY / T220.1-2006 standard. Figure 1 shows the frame structure based on time slot division. A physical layer signal is 1 frame per second, which is divided into 40 time slots (TimeSlot, TS). The length of each time slot is 25 ms, including 1 beacon (Beacon) and 53 OFDM (Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing) symbols. Each time slot uses the same beacon length ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L5/26H04Q7/36H04Q7/22
Inventor 请求不公布姓名
Owner INNOFIDEI TECHNOLOGIES INC