A reconfigurable wideband digital channelized switching method and system
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A digital channelization and broadband technology, applied in the field of satellite communication, can solve the problems of low flexibility, large amount of calculation and storage, etc.
Inactive Publication Date: 2016-08-17
NO 63 RES INST HEADQUARTERS OF THE GENERAL STAFF PLA
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Problems solved by technology
The existing commonly used digital channelization methods are more or less limited and less flexible: the analytical signal method requires that all sub-channels to be processed have the same bandwidth; the digital down-conversion method requires a small ~8); the tree method requires that there is a relationship N=2 between the subchannel multiplexing number N and the series L using filtering and extraction structures 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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Embodiment 1
[0077] figure 1 It is a flowchart of the reconfigurable broadband digital channelization switching method described in Embodiment 1 of the present invention, as shown in figure 1 As shown, the method includes:
[0078] 110: Designing a finite-length unit impulse response FIR equiripple low-pass filter bank whose bandwidth is a predetermined multiple of the basic sub-channel bandwidth.
[0079] Specifically, the predetermined multiple b is an integer, and 1≤b≤B; wherein, B represents the maximum number of basic sub-channels that the broadband uplink channel can contain. The number of basic subchannels included in the broadband downlink channel is generally the same as the number of basic subchannels included in the broadband uplink channel. In addition, the passband fluctuation of each filter in the low-pass filter bank to be designed (α p ≤0.1dB), stopband attenuation (α s ≥114dB), transition band width BW g , The filter order L is the same, and the passband bandwidth of ...
Embodiment 2
[0141] Figure 6 It is a schematic diagram of the module structure of the reconfigurable broadband digital channelized switching system described in Embodiment 2 of the present invention, as shown in Figure 6 As shown, the system 600 includes: a design unit 610 , an extraction unit 620 , a separation unit 630 , an exchange unit 640 and a synthesis unit 650 .
[0142] The design unit 610 is configured to design a finite-length unit impulse response FIR equiripple low-pass filter bank whose bandwidth is a predetermined multiple of the basic sub-channel bandwidth.
[0143] Wherein, the predetermined multiple b is an integer, and 1≤b≤B; wherein, B represents the maximum number of basic sub-channels that the broadband uplink channel can contain.
[0144] The extracting unit 620 is configured to trim and extract frequency domain parameters of each low-pass filter in the low-pass filter bank.
[0145] see Figure 7 , the extracting unit 620 specifically includes:
[0146] Calcul...
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Abstract
The invention discloses a reconfigurable broadband digital channelized exchange method and system and relates to the communication field. The reconfigurable broadband digital channelized exchange method includes that a finite impulse response (FIR) equiripple low-pass filter group with the bandwidth to be the preset times of the bandwidth of a basic sub channel is designed; the frequency domain parameter of each low-pass filter in the low-pass filter group is extracted and trimmed; base band frequency domain data of each business sub signal are separated from a broadband uplink channel according to the frequency domain parameters; the base band frequency domain data of the business sub signals obtained through separation are subjected to exchange processing to obtain base band frequency domain data of each business signal in a broadband downlink channel; the base band frequency domain data of the business signals in the broadband downlink channel are comprehensively processed to obtain time domain complex base band data of the broadband downlink channel. The reconfigurable broadband digital channelized exchange method and system remarkably improve flexibility of a digital channelized device.
Description
technical field [0001] The invention relates to the technical field of satellite communication, in particular to a reconfigurable broadband digital channelized switching method and system. Background technique [0002] The satellite communication application environment is becoming more and more complex, and related technologies and communication requirements are developing rapidly. The high cost of geostationary satellites and the much higher difficulty of on-orbit technology update than ground systems require on-orbit geosynchronous satellites to have extensive adaptability and flexibility. Specifically, the requirements are: the on-board payload is not sensitive to the specific frame structure, channel codec method, and signal modulation method used in the transmission service, and has wide adaptability; the on-board payload has the on-board switching function. Digital channelization technology is just in line with this development situation. [0003] Digital channelizat...
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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/00H04B7/204
Inventor 党军宏杨恒潘亚汉
Owner NO 63 RES INST HEADQUARTERS OF THE GENERAL STAFF PLA
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