Broadband frequency selection method for multi-filter
A filter and broadband technology, which is applied in the field of multi-filter to realize broadband frequency selection, can solve the problems of reduced portability and compatibility of frequency selection devices, decreased system flexibility of application of frequency selection devices, and increased difficulty of engineering debugging, etc. To achieve the effect of expanding the scope of application, reducing difficulty and reducing requirements
Inactive Publication Date: 2007-08-01
广州钟鼎木林网络技术有限公司
View PDF0 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Therefore, when it is necessary to use a filter to select the frequency of the broadband signal, it is necessary to use a filter with appropriate parameters to filter it. In this way, the portability and compatibility of each frequency selection device will be greatly reduced, which further leads to the application selection. The flexibility of the system of the frequency device is correspondingly reduced
[0003] In addition, for the traditional analog frequency selection technology, engineers need to use complex formulas to calculate the VCO frequency in order to obtain the final parameters, which also increases the difficulty of project debugging
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0032] The present invention will be further disclosed below in conjunction with the accompanying drawings and embodiments.
[0033] In order to better illustrate the specific embodiments of the present invention, the following constraints need to be preset:
[0034] (1) Filter carrier conditions: the carrier passband is 3.84MHz, the carrier bandwidth is 5MHz, and the number of carriers is 4. Carrier characteristics shown in Figure 1.
[0035] (2) The interval between two channels is greater than or equal to 200KHz. as shown in picture 2.
[0036] (3) Each channel should be within the carrier passband of a single filter.
[0037] The following conclusions can be drawn from this condition:
[0038] The frequency interval of channels within the same carrier is less than or equal to 3.84MHz.
[0039] The distance from the channel to its carrier center frequency is less than or equal to 1.92MHz.
[0040] (4) Each channel can only be within the carrier passband of a single fi...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a method of realizing wide band frequency selection by multiple filters that comprises steps as following: C. calculating all channel combination which is in the carrier band of the same filter; D. calculating the carrier central frequency range of every possible channel combination; E. setting least filter to load all the channel and mixing; F. checking whether the number of filter exceed the max; if the number of filter exceed the max, the mixing is ended; otherwise, the step G is exceeded; G. detecting whether every channel is in the carrier band of the same filter under the current filter number; if every channel is in the carrier band of the same filter, the mixing is ended, then the step H is proceeded; otherwise a filter is added to proceed step F; H. calculating the carrier central frequency and set the filter. The invention can decrease the cost of project installation, debugging and maintenance time. Besides, the interference of other channel can be decreased; and the application of the invention can be expended.
Description
technical field [0001] The invention relates to the field of mobile communication signal processing, in particular to a method for realizing broadband frequency selection with multiple filters. Background technique [0002] Digital frequency selection technology is very critical to the processing of communication signals, and is widely used in various occasions, such as the application of wireless frequency selection repeater is a typical example. The frequency selection of the broadband signal directly affects the normality of the communication. In the prior art of digital frequency selection, it is necessary to perform frequency selection on broadband signals through filters, and each filter generally has specific passband parameters. Therefore, when it is necessary to use a filter to select the frequency of the broadband signal, it is necessary to use a filter with appropriate parameters to filter it. In this way, the portability and compatibility of each frequency selec...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H04B7/26H04B1/40H04L27/00H04B1/52H04B1/525
Inventor 黄伯宁余波
Owner 广州钟鼎木林网络技术有限公司