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Synchronization method and system for constructing single-frequency sub network

A synchronization system and sub-network technology, applied in transmission systems, synchronization devices, digital transmission systems, etc., can solve problems such as poor signals, and achieve the effect of bit synchronization

Active Publication Date: 2016-03-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The multi-frequency network can meet the signal coverage in areas with good geographical location (for example: near the transmitter, open terrain, and areas with few obstacles), but the signal in edge areas is usually relatively poor, which is also known as the "cliff effect".

Method used

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  • Synchronization method and system for constructing single-frequency sub network
  • Synchronization method and system for constructing single-frequency sub network
  • Synchronization method and system for constructing single-frequency sub network

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Embodiment Construction

[0038] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0039] The purpose of this embodiment is to provide a synchronization method and system for constructing a single-frequency subnet, which is used for constructing a single-frequency subnet in an NGB-W system and ensuring synchronization of the single-frequency subnet. The principle and implementation of a synchronization method and system for constructing a single-frequency subnet in this embodiment will be described in detail below, s...

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Abstract

The invention provides a synchronization method and system for constructing a single-frequency sub network. The method includes the following steps that: an NGB-W data packet with at least synchronous transmitting parameters interposed therein and an MIP data packet which at least contains synchronization time information which enables relaying synchronous receiving and transmitting are constructed in an NGB-W system; a plurality of relaying receivers receive broadcast signals transmitted by corresponding first-level transmitters in the NGB-W system; and a plurality of relaying transmitters obtain the synchronous transmitting parameters in the NGB-W data packet and the synchronization time information in the MIP data packet, and transmits out the received the broadcast signals with a second frequency at the same time point according to the synchronous transmitting parameters and the synchronization time information. According to the synchronization method of the invention, time synchronization is mainly embodied on time marks in the MIP data packet. With the synchronization method and system of the invention adopted, when the single-frequency sub network is constructed, the synchronization of frequency, time and bit in the single-frequency sub network can be realized, and signals of a fringe area can be enhanced.

Description

technical field [0001] The present invention relates to the technical field of the next generation wireless broadcast (NGB-W), in particular to the technical field of the single frequency network (SFN) in the next generation wireless broadcast (NGB-W) system, specifically a method for constructing a single frequency subnet Synchronization method and system. Background technique [0002] Single Frequency Network (SFN: Single Frequency Network) refers to a digital TV coverage network composed of multiple radio transmitters located in different locations and in a synchronized state. All radio transmitters in the SFN transmit the same frequency at the same time Signals are modulated over the air to achieve reliable coverage of a specific service area. SFN has the following technical advantages: [0003] (1) Conducive to frequency planning. In the case of limited spectrum resources, it can improve spectrum utilization and save frequency resources. [0004] (2) Improve wireles...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L7/00H04N5/067H04N7/56
CPCH04L7/0025H04N5/0675H04N7/56
Inventor 蔡青春王甜甜李明齐封松林
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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