Star-loading reconstruction wideband digital channel exchange method

Abstract

The invention relates to a satellite-borne reconfigurable broadband digital channelizing switching method, belonging to the technical field of satellite communication. The method comprises the following steps of: carrying out secondary sampling to uplink signals of the satellite so as to obtain digital signals; constructing perfect reconfigurable prototype filtering module and obtain a complex-exponential modulation perfect reconfigurable filter group module by complex-exponential modulation; carrying out filtering to the secondary sampling signals so as to obtain baseband signals of subchannels; carrying switching to the separated baseband signals of the subchannels according to switching information set by the satellite so as to obtain switched data; carrying combination to the switcheddata so as to obtain the downlink signals of the satellite. The method is not independent physical layer concrete setting, is not relevant to the wave form of the signals to be processed, and has good adaptability; the method is suitable for uniform bandwidth channel switching scenes and is also suitable for non-uniform bandwidth channel switching scenes; all the control is realized by control signaling with flexible reconfigurability; and the method supports functions of broadcast and multicast simultaneously.

Description

technical field [0001] The invention relates to a satellite-borne reconfigurable broadband digital channelization switching method, which belongs to the technical field of satellite communication. Background technique [0002] With the development of science and technology, the complexity of communication satellites is increasing day by day, with the characteristics of multi-task, multi-beam, multi-frequency band and multi-channel planning, which will require the satellite payload to have very high in-orbit flexibility (or Flexibility), in order to reduce the various operating constraints of the system as much as possible, so as to give full play to the value of the satellite. [0003] The core function of communication satellites is to complete information relay. In this sense, the design of satellite payloads will develop in the following two directions, namely, transparently forwarding satellite payloads and on-board regenerative satellite payloads. With the increasing d...

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Problems solved by technology

The existing commonly used digital channelization methods have more or less limitations: the analytical signal method requires all sub-channels to be processed to have the same bandwidth; the digital down-conversion method requires a small The domain filtering method needs to dynamically load fast Fourier transform and fast inverse fast Fourier transform modules with different points, and has high requirements for storage; the tree method requires that there is a relationship between the number N of sub-channel multiplexing and the number of series L using filtering and extraction structures N= 2 L ; The multiphase discrete DFT method usually requires that all subchannels have the same bandwidth, and the guard bandwidth between subchannels is the same; the discrete filter bank method requires a very large amount of calculation and storage when the number of multiplexed subchannels is large

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