Star-loading reconstruction wideband digital channel exchange method

A digital channelization and broadband technology, applied in the field of satellite communication, can solve the problems of large amount of calculation and storage, high storage requirements, and achieve the effect of small exchange granularity, strong adaptability and flexible processing ability.

Inactive Publication Date: 2009-04-22
TSINGHUA UNIV
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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 requi...

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  • Star-loading reconstruction wideband digital channel exchange method
  • Star-loading reconstruction wideband digital channel exchange method
  • Star-loading reconstruction wideband digital channel exchange method

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Experimental program
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Effect test

Embodiment 1

[0077] Embodiment 1: Carry out sub-channel exchange with the method of the present invention:

[0078] In order to illustrate the flexibility of sub-channel switching, it can be seen that the channelized switching structure proposed by the present invention has the characteristics of reconfigurability, assuming that the uplink signal is as follows: Figure 4 shown. Here, it is desirable to exchange user subchannel 7 with user subchannel 15 . After switching, the output downlink signal is as follows Figure 6 shown.

[0079] From Figure 6 It can be seen that in the downlink channel, user sub-channel 7 and user sub-channel 15 have exchanged positions, and other user sub-channels remain unchanged. In fact, the realization of this exchange process is very simple and convenient. According to the number of basic sub-channels occupied by user sub-channels to be exchanged, the auxiliary sub-channels of the present invention are adjusted. image 3 The number of corresponding synt...

Embodiment 2

[0080] Embodiment 2: Using the method of the present invention to realize broadcast and multicast functions.

[0081] Traditional transparent repeaters have almost no multicast function. However, the digital channelized switching device of the present invention can well support broadcast and multicast functions, because the digital signal processing method is used in the structure, and the data can be easily copied to the output position. Here, the attached Figure 4 The upstream input signal is shown. For the broadcast case, the information of user 7 is assumed as the broadcast source, and broadcast to all users in the considered downlink. The process is attached Figure 7 shown.

[0082] For the multicast situation, it is assumed that there are three multicast groups in the considered scenario, and the multicast sources are information in user sub-channel 1, user sub-channel 2, and user sub-channel 7 respectively. The simulation results of multicast are as follows Fig...

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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 switched data 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...

Claims

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Application Information

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IPC IPC(8): H04B7/185H04B7/208
Inventor 阳志明周坡晏坚曹志刚
Owner TSINGHUA UNIV
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