Method and device for extending signal bandwidth in digital transmission system

Abstract

Proposed is a method for expanding signal bandwidth in a digital transmission system. The method includes the following steps: performing channel coding on service data, and allocating according to the spectrum mode used by a system the coded service data to one or more sub-bands designated by the spectrum mode; performing interleaving transformation in the time domain and frequency domain on the service data on the one or more sub-bands in units of interleaving blocks according to a multi-sub-band interleaving algorithm; performing sub-carrier modulation mapping on the interleaved service data in the order of the sub-bands according to the spectrum mode used by the system, and modulating the service data on each sub-band onto the signal of a corresponding sub-band frequency band; and sending the data on the signal of each sub-band frequency band. In addition, also proposed is a corresponding device for expanding signal bandwidth. Applying the method and device, each sub-band can transmit data alone. When it is necessary to improve the data transmission rate, by way of simultaneously using a plurality of sub-bands to perform transmission collaboratively, the signal bandwidth of a single data service is improved, effectively taking advantage of the limited bandwidth resources.

Description

technical field [0001] The invention relates to the technical field of digital information transmission, in particular to a method and device for expanding signal bandwidth in a digital transmission system. Background technique [0002] Digital audio broadcasting is the third-generation broadcasting technology following AM and FM traditional analog broadcasting. Compared with traditional analog broadcasting, its advantage is that it can not only play high-quality audio broadcasting, but also transmit multiple data services. Due to the existence of traditional broadcasting technology and the limitation of bandwidth resources, FM band digital audio broadcasting system is a main direction of current digital broadcasting development. When the digital broadcasting system works in the traditional analog FM broadcasting frequency band, it usually adopts in-band and out-of-band broadcasting methods. Among them, the in-band broadcasting method means that the processed digital broadc...

AI Technical Summary

Problems solved by technology

[0003] In general digital signal transmission, the bandwidth of the signal is fixed, which makes the range of data transmission rate narrow, and the type of data supported for transmission is relatively simple. Obviously, this cannot meet the needs of transmitting multiple data services in digital audio broadcasting systems.

However, the available bandwidth resources of the out-of-band broadcasting system are relatively limited, so how to effectively utilize the limited bandwidth between the analog FM frequency bands to support this type of system is a problem solved by the present invention to the requirements of multiple data rates and multiple service data types

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