Multi-frequency-point cooperative work sending and receiving method and system thereof for digital audio broadcasting signal

Abstract

A method for sending a digital audio broadcasting signal collaboratively working with multi-frequency point, including the following steps: a sending end dividing a digital audio broadcasting data stream of each digital broadcasting station into a plurality of sub-data streams according to a specific time length; setting a specific working frequency point sequence for the sub-data streams of each digital broadcasting station to enable the sub-data streams sent at the same moment from different digital broadcasting stations not to appear at an identical working frequency point, and for each digital broadcasting station, inserting multi-frequency point working information about the next sub-data stream into the sub-data stream sent at the current working frequency point; and circularly modulating and sending the digital audio broadcasting data stream of each digital broadcasting station at the working frequency sequence corresponding thereto. Also proposed are a corresponding receiving method, and a sending system and a receiving system. The present invention can improve the spectrum utilization rate, realize frequency diversity gain while being compatible with the existing frequency plan restrictions, thus improving the effective coverage of the radio broadcasting system.

Description

technical field [0001] The present invention relates to a method for sending and receiving a digital audio broadcasting signal and its system, in particular to a method for sending and receiving a digital audio broadcasting signal and a system for multi-frequency point cooperative work, which is suitable for use on the ground, satellites, etc. In-house wireless audio digital broadcasting system. Background technique [0002] The biggest feature of the wireless digital broadcasting system is its wide coverage, diverse geographical environments, complex and changeable channel characteristics, and serious noise and interference. In order to ensure effective signal coverage and reliable transmission, the wireless digital broadcasting system must be able to fully adapt to harsh transmission channels characteristic. Signal diversity technology, such as frequency diversity, is to transmit signals in a frequency band much larger than the channel coherence bandwidth, and is an effec...

AI Technical Summary

Problems solved by technology

The main defect of this broadcasting scheme is that due to the spatial propagation characteristics of radio waves and multipath fading, the signal strength (or carrier-to-noise ratio) at different locations in the coverage area varies greatly, even in a location close to the transmitting station. Geographical location, it is also possible that the signal quality is lower than the demodulation threshold due to multipath frequency selective fading

In order to ensure ideal coverage, it can only be improved by increasing the power of the transmitting station, or by adding point complements, which brings new problems to interference control, frequency planning and network erection

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