Optimization method for multi-service broadcast single frequency network based on superposition coding

Abstract

The invention discloses a multi-service broadcasting single-frequency network optimizing method based on superposition codes. The multi-service broadcasting single-frequency network optimizing method comprises the following steps of S1, segmenting physical layer channels into a common subchannel and a local subchannel which are used for respectively transmitting common services and local services; S2, according to the networking information and service requirements, setting the initial values of transmitting base station parameters and subchannel transmitting parameters, and selecting one part of parameters as to-be-optimized parameters, including adjustable transmitting parameters of subchannels and adjustable parameters of a transmitting base station; S3, calculating the target function value corresponding to the overall receiving property of the target area, optimizing the adjustable transmitting parameters of the subchannels, and furthest optimizing the target function value; S4, performing optimum iteration on the adjustable transmitting parameters of the transmitting base station, and gradually updating the target function value by generations, so as to obtain the optimum adjustable parameters; S5, repeating the steps S2 to S5, selecting different initial values, so as to obtain a group of optimizing results. The multi-service broadcasting single-frequency network optimizing method has the advantages that the coverage requirement of the common services is guaranteed to meet, and the coverage effect of the local services is improved.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a multi-service broadcast single frequency network optimization method based on superposition coding. Background technique [0002] In traditional analog TV broadcasting, in order to avoid co-channel interference, adjacent transmitting base stations transmit signals at different frequencies, and the same frequency can only be reused at a certain distance apart. This kind of Multiple Frequency Network (MFN) The networking mode causes serious waste of limited frequency resources. With the transition of terrestrial TV broadcasting from the analog era to the digital era, the number of digital TV channels has increased rapidly, and frequency resources have become increasingly tense. Single Frequency Network (SFN) networking relies on its large coverage, low transmitter cost, and high frequency utilization. The advantages gradually replace the multi-frequency network and become...

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Problems solved by technology

[0004] However, since the strong multipath effect in the single frequency network will lead to intersymbol interference and frequency selective fading of the signal, the selection of the physical layer channel resource allocation method during superposition coding will also have a great impact on the overall coverage. It is of great significance to efficiently and reasonably analyze, design and optimize SFN for multi-service transmission

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