A transmitter, modulator and signal synchronization transmission method for single frequency network transmission system

Abstract

The invention discloses a signal synchronized transmission method of a single frequency network transmission system, a single frequency network system transmitter and a single frequency network transmitting station modulator. The method comprises the following steps. Firstly, valid data are extracted from the received data. Channels of the extracted valid data are encoded; and the valid data are mapped and modulated; the modulated data are stored in a storage unit. When the impulse pilot signal is received, data in the storage unit are taken out, and then the digital / analog conversion processing and the conversion processing from the baseband to the radio frequency are conducted, and then the data are transmitted to the air through antennae. The transmitter comprises a synchronizing system, a modulator and a storage unit. The modulator comprises a channel encoding module, a mapping module, a modulation module, a digital / analog converter, a module of conversion from the baseband to the radio frequency and a storage unit. The storage unit is used to store modulated data. After the modulator receives the impulse pilot signal, the data in the storage unit are taken out and are transmitted to the digital / analog converter. By adopting the proposal of the invention, different transmitters can transmit signals at the same time.

Description

technical field [0001] The invention relates to a single frequency network system, in particular to a transmitter, a modulator and a signal synchronous transmission method of a single frequency network transmission system. Background technique [0002] In order to improve the efficiency of spectrum use, a variety of technologies are currently used in the communication field, among which the SFN (Single Frequency Network, single frequency network) technology is a very effective key technology. The single frequency network system is composed of multiple digital transmitters, and the transmitter stations distributed in the mesh are used to achieve large-scale coverage. In the prior art, a typical single frequency network system is mainly composed of a central station, a transmitting station and a distributed network, wherein: the central station is used for distributing and concentrating signals, including multiplexing modules and SFN adapters; the transmitting station is a sin...

AI Technical Summary

Problems solved by technology

As for the baseband processing module, the specific implementation methods of different transmitter manufacturers may not be completely consistent, so the processing delay may not be safe and consistent; This will not be conducive to the operation of the network, not conducive to the prosperity of the market, and will limit the development of the single frequency network system

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