CN109802874B - EoC terminal and working frequency band setting method thereof - Google Patents
EoC terminal and working frequency band setting method thereof Download PDFInfo
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- CN109802874B CN109802874B CN201711148303.8A CN201711148303A CN109802874B CN 109802874 B CN109802874 B CN 109802874B CN 201711148303 A CN201711148303 A CN 201711148303A CN 109802874 B CN109802874 B CN 109802874B
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Abstract
The invention provides an EoC terminal and a working frequency band setting method thereof, wherein the EoC terminal comprises: the first channel modulator modulates a baseband frequency band with a central frequency point of f0 into a first intermediate frequency band with the central frequency point of f1-f0 and a first mirror image intermediate frequency band with the central frequency point of f1+ f0 by using a first intermediate frequency modulation frequency f1, and modulates the baseband frequency band with the central frequency point of f0 into a second intermediate frequency band with the central frequency point of f2-f0 and a second mirror image intermediate frequency band with the central frequency point of f2+ f0 by using a second intermediate frequency modulation frequency f 2; a first band-pass filter for obtaining a first required intermediate frequency band; the second channel modulator modulates the first required intermediate frequency band into a first required high frequency band and a first mirror image required high frequency band by using the first high frequency modulation frequency f 5; and the second band-pass filter outputs the high-frequency band required by the first image after filtering. The invention only needs 2 filters, thus greatly saving the cost; moreover, the filter adopted by the invention cannot be difficult to realize along with the rise of the modulation frequency, and is very convenient for market popularization.
Description
Technical Field
The invention belongs to the technical field of communication, relates to an EoC communication system, and particularly relates to an EoC terminal and a working frequency band setting method thereof.
Background
Eoc (ethernet Over cable) is an access technology using ethernet protocol based on cable tv coaxial cable network. The basic principle is to transmit data signals conforming to the 802.3 series standards through the coaxial cable for home by using a specific medium conversion technology (mainly comprising impedance transformation, balance/unbalance transformation and the like). The technology can make full use of the existing home-entry coaxial cable resources of the cable television network, and solves the last 100m access problem.
In order to improve the bus access bandwidth of the EoC and enhance the anti-interference capability of the system, the EoC head end generally needs to support multiple frequency points, and accordingly, the EoC terminal is preferably broadband and can be registered on any frequency point of the head end as required to realize frequency hopping and load balancing functions. According to the traditional solution, if the terminal needs to support multiple frequency points, a set of filters and a switch are usually configured for each frequency point, and software turns on the switch according to the system needs to select the filter of the corresponding frequency point. This approach has two major drawbacks: the first is that the frequency point is not suitable for the high frequency band, when the frequency point and the frequency width of the baseband are determined, the frequency difference between the mirror images is fixed after the baseband is modulated to the radio frequency, the higher the modulation frequency is, the more the rising edge of the filter is jittered, namely the more the difficulty in realizing the filter is; secondly, the cost of the EoC terminal is increased by a plurality of filters, which is not favorable for market promotion.
Disclosure of Invention
In view of the above drawbacks of the prior art, an object of the present invention is to provide an EoC terminal and a method for setting an operating frequency band thereof, which are used to solve the problems of difficulty and high cost in implementing the EoC terminal to operate in multiple frequency bands in the conventional scheme.
To achieve the above and other related objects, the present invention provides an EoC terminal, comprising: the first channel modulator modulates a baseband frequency band with a central frequency point of f0 into a first intermediate frequency band with central frequency points of f1-f0 and a first mirror image intermediate frequency band with central frequency points of f1+ f0 by using a first intermediate frequency modulation frequency f 1; the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a second intermediate frequency band with center frequency points of f2-f0 and a second mirror image intermediate frequency band with center frequency points of f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth; a first band-pass filter for filtering the first intermediate frequency band, the first mirror image intermediate frequency band, the second intermediate frequency band and the second mirror image intermediate frequency band to obtain a first required intermediate frequency band; the first desired intermediate frequency band comprises the first mirror image intermediate frequency band and the second mirror image intermediate frequency band; wherein the center frequency of the first band-pass filter is fv1, and Gap21/fv1 is > 6%, Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f 0-B; a second channel modulator for modulating the first desired intermediate frequency band into a first desired high frequency band and a first mirror desired high frequency band by using a first high frequency modulation frequency f 5; f5+ f1+ f0>800 MHz; and the second band-pass filter outputs the high-frequency band required by the first mirror image after filtering.
In an embodiment of the present invention, the EoC terminal further includes: the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a third intermediate frequency band with center frequency points of f3-f0 and a third mirror image intermediate frequency band with center frequency points of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P; the first band-pass filter filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band and the third mirror image intermediate frequency band to obtain a third required intermediate frequency band; the third desired intermediate frequency band comprises the first mirror image intermediate frequency band, the second mirror image intermediate frequency band and the third intermediate frequency band; wherein, fv1 ═ (f3-f0- (f2+ f0))/2 ═ (f3-f2-2f0)/2, Gap21/fv1> 6%; the second channel modulator modulates the third required intermediate frequency band into a third required high frequency band and a third mirror image required high frequency band by using the first high frequency modulation frequency f 5; and the second band-pass filter outputs the high-frequency band required by the third image after filtering.
In an embodiment of the present invention, the EoC terminal further includes: the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a fourth intermediate frequency band with center frequency points of f4-f0 and a fourth mirror image intermediate frequency band with center frequency points of f4+ f0 by using a fourth intermediate frequency modulation frequency f 4; f4 ═ f1+5B + 4P; the first band-pass filter filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third mirror image intermediate frequency band, the fourth intermediate frequency band and the fourth mirror image intermediate frequency band to obtain a fourth required intermediate frequency band; the fourth desired intermediate frequency band includes the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band, and the fourth intermediate frequency band; the second channel modulator modulates the fourth required intermediate frequency band into a fourth required high frequency band and a fourth mirror image required high frequency band by using the first high frequency modulation frequency f 5; and the second band-pass filter outputs the high-frequency band required by the fourth mirror image after filtering.
In an embodiment of the present invention, the second band-pass filter is included in a combiner, and the combiner is built in or externally disposed to the EoC terminal; the combiner also comprises a low-pass filter; the low-pass filter is used for accessing television signals; and the combiner outputs the output signal of the low-pass filter and the output signal of the second band-pass filter through a coaxial cable.
The invention also provides a method for setting the working frequency band of the EoC terminal, which comprises the following steps: the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a first intermediate frequency band with central frequency points of f1-f0 and a first mirror image intermediate frequency band with central frequency points of f1+ f0 by using a first intermediate frequency modulation frequency f 1; the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a second intermediate frequency band with central frequency points of f2-f0 and a second mirror image intermediate frequency band with central frequency points of f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth; the EoC terminal utilizes a first band-pass filter to filter the first intermediate frequency band, the first mirror image intermediate frequency band, the second intermediate frequency band and the second mirror image intermediate frequency band to obtain a first required intermediate frequency band; the first desired intermediate frequency band comprises the first mirror image intermediate frequency band and the second mirror image intermediate frequency band; wherein the center frequency of the first band-pass filter is fv1, and Gap21/fv1 is > 6%, Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f 0-B; the EoC terminal modulates the first required intermediate frequency band into a first required high frequency band and a first mirror image required high frequency band by using a first high frequency modulation frequency f 5; f5+ f1+ f0>800 MHz; and the EoC terminal outputs the high-frequency band required by the first image by filtering through a second band-pass filter.
In an embodiment of the present invention, the method further includes: the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a third intermediate frequency band with central frequency points of f3-f0 and a third mirror image intermediate frequency band with a central frequency point of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P; the EoC terminal utilizes the first band-pass filter to filter the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band and the third mirror image intermediate frequency band to obtain a third required intermediate frequency band; the third desired intermediate frequency band comprises the first mirror image intermediate frequency band, the second mirror image intermediate frequency band and the third intermediate frequency band; wherein, fv1 ═ (f3-f0- (f2+ f0))/2 ═ (f3-f2)/2, Gap21/fv1> 6%; the EoC terminal modulates the third required intermediate frequency band into a third required high frequency band and a third mirror image required high frequency band by using the first high frequency modulation frequency f 5; and the EoC terminal outputs the high-frequency band required by the third mirror image by using the second band-pass filter.
In an embodiment of the present invention, the method further includes: the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a fourth intermediate frequency band with central frequency points of f4-f0 and a fourth mirror image intermediate frequency band with a central frequency point of f4+ f0 by using a fourth intermediate frequency modulation frequency f 4; f4 ═ f1+5B + 4P; the EoC terminal uses the first band-pass filter to filter the first intermediate frequency band, the first mirror intermediate frequency band, the second mirror intermediate frequency band, the third mirror intermediate frequency band, the fourth intermediate frequency band and the fourth mirror intermediate frequency band to obtain a fourth required intermediate frequency band; the fourth desired intermediate frequency band includes the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band, and the fourth intermediate frequency band; the EoC terminal modulates the fourth required intermediate frequency band into a fourth required high frequency band and a fourth mirror image required high frequency band by using the first high frequency modulation frequency f 5; and the EoC terminal outputs the high-frequency band required by the fourth mirror image by using the second band-pass filter.
In an embodiment of the present invention, the second band-pass filter is included in a combiner, and the combiner is built in or externally disposed to the EoC terminal; the combiner also comprises a low-pass filter; the low-pass filter is used for accessing television signals; and the combiner outputs the output signal of the low-pass filter and the output signal of the second band-pass filter through a coaxial cable.
In an embodiment of the invention, the first band-pass filter is replaced with a second high-pass filter.
As described above, the EoC terminal and the method for setting the operating frequency band thereof according to the present invention have the following advantages:
the invention can realize that the EoC terminal works in a plurality of frequency bands by only 2 filters, and does not need to set one filter for each working frequency point of the EoC terminal, thereby greatly saving the cost; moreover, the filter adopted by the invention cannot be difficult to realize along with the rise of the modulation frequency, and is very convenient for market popularization.
Drawings
Fig. 1A is a schematic diagram of an implementation structure of an EoC terminal according to an embodiment of the present invention.
Fig. 1B is a schematic diagram of another implementation structure of an EoC terminal according to an embodiment of the present invention.
Fig. 1C is a schematic diagram of a third implementation structure of an EoC terminal according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of implementing spectrum modulation of 2 working frequency points by an EoC terminal according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of implementing spectrum modulation of 3 working frequency points by an EoC terminal according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of implementing spectrum modulation of 4 working frequency points by an EoC terminal according to an embodiment of the present invention.
Description of the element reference numerals
100 EoC terminal
110 first channel modulator
120 first band-pass filter
130 second channel modulator
140 second band pass filter
200 combiner
210 low pass filter
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
Referring to fig. 1A, an embodiment of the present invention provides an EoC terminal, where the EoC terminal 100 includes: a first channel modulator 110, a first band pass filter 120, a second channel modulator 130, a second band pass filter 140. Wherein the second band-pass filter can be a separate band-pass filter, as shown in fig. 1A; the second band-pass filter 140 may also be a band-pass filter in a duplex combiner 200, and the combiner 200 may be built in the EoC terminal 100, as shown in fig. 1B; the combiner 200 may also be externally disposed to the EoC terminal 100, as shown in fig. 1C.
The combiner 200 includes a second band-pass filter 140 and a low-pass filter 210; the low pass filter 210 is used for accessing a television signal; the combiner 200 outputs the output signal of the low pass filter and the output signal of the second band pass filter through a coaxial cable. The second band-pass filter may also be replaced by a high-pass filter.
Referring to fig. 2, the first channel modulator 110 modulates a baseband frequency band with a center frequency point f0 into a first intermediate frequency band with center frequency points f1-f0 and a first mirror image intermediate frequency band with a center frequency point f1+ f0 by using a first intermediate frequency modulation frequency f 1; the first channel modulator 110 modulates the baseband frequency band with the center frequency point f0 into a second intermediate frequency band with the center frequency point f2-f0 and a second mirror image intermediate frequency band with the center frequency point f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, P is a fixed channel guard bandwidth. The actual values of B and P are adjustable and can be adjusted according to actual application. The first band-pass filter 120 filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second intermediate frequency band, and the second mirror image intermediate frequency band to obtain a first required intermediate frequency band; the first desired intermediate frequency band comprises the first mirror image intermediate frequency band and the second mirror image intermediate frequency band; wherein the center frequency of the first band-pass filter is fv1, and Gap21/fv1 is > 6%, Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f 0-B; the second channel modulator 130 modulates the first desired intermediate frequency band into a first desired high frequency band and a first mirror desired high frequency band by using a first high frequency modulation frequency f 5; the second band-pass filter 140 outputs the high frequency band required by the first image after filtering.
For example: a central frequency point f0 of the baseband frequency band is 90MHz, a bandwidth B of the baseband frequency band is 60MHz, a channel protection bandwidth P is 15MHz, a first intermediate frequency modulation frequency f1 is 100MHz, a second intermediate frequency modulation frequency f2 is 175MHz, a Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f0-B ═ 45MHz, the first intermediate frequency band whose central frequency point (f1-f0) is 10MHz and a first mirror image intermediate frequency band whose central frequency point (f1+ f0) is 190MHz, and a second intermediate frequency band whose central frequency point (f2-f0) is 85MHz and a second mirror image intermediate frequency band whose central frequency point (f2+ f0) is 265MHz can be obtained after modulation by the first channel modulator 110; at this time, if a first mirror image intermediate frequency band with a central frequency point (f1+ f0) of 190MHz and a second mirror image intermediate frequency band with a central frequency point (f2+ f0) of 265MHz are to be obtained as a first required intermediate frequency band, the central frequency fv1 of the first band-pass filter should meet the condition Gap21/fv1> 6%, wherein Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f0-B ═ 45 MHz; assuming that the center frequency fv1 of the first bandpass filter is fv1 ═ f2+ f0- (f1+ f0))/2+ (f1+ f0) ═ 227.5MHz, or fv1 ═ f3-f0- (f2+ f0))/2+ (f2+ f0) ═ 280MHz, the first desired intermediate frequency band can be obtained. The first desired intermediate frequency band is modulated by the second channel modulator 130 with a first high-frequency modulation frequency f5 of 680MHz, and then a first desired high-frequency band and a first mirror image desired high-frequency band are output; the high-frequency bands required by the first mirror image are 2 frequency bands with central frequencies of 870MHz and 945MHz and bandwidths of 60MHz respectively. The high frequency band required by the first image is filtered by the second band-pass filter 140 and then output.
Referring to fig. 3, the first channel modulator 110 modulates a baseband frequency band with a center frequency point f0 into a first intermediate frequency band with center frequency points f1-f0 and a first mirror image intermediate frequency band with a center frequency point f1+ f0 by using a first intermediate frequency modulation frequency f 1; the first channel modulator 110 modulates the baseband frequency band with the center frequency point f0 into a second intermediate frequency band with the center frequency point f2-f0 and a second mirror image intermediate frequency band with the center frequency point f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth; the first channel modulator 110 modulates the baseband frequency band with a center frequency point of f0 into a third intermediate frequency band with center frequency points of f3-f0 and a third mirror image intermediate frequency band with center frequency points of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P; the first band-pass filter 120 filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band and the third mirror image intermediate frequency band to obtain a third required intermediate frequency band; the third desired intermediate frequency band comprises the first mirror image intermediate frequency band, the second mirror image intermediate frequency band and the third intermediate frequency band; the center frequency of the first band-pass filter is fv 1; wherein, fv1 ═ (f3-f0- (f2+ f0))/2 ═ (f3-f2-2f0)/2, Gap21/fv1> 6%; the second channel modulator 130 modulates the third desired intermediate frequency band into a third desired high frequency band and a third mirror desired high frequency band using the first high frequency modulation frequency f 5. The second band-pass filter 140 outputs the high frequency band required by the third image after filtering.
For example: a central frequency point f0 of the baseband frequency band is 90MHz, a bandwidth B of the baseband frequency band is 60MHz, a channel protection bandwidth P is 15MHz, a first intermediate frequency modulation frequency f1 is 100MHz, a second intermediate frequency modulation frequency f2 is 175MHz, and a third intermediate frequency modulation frequency f3 is 385MHz, then a first image intermediate frequency band in which a central frequency point (f1-f0) is 10MHz and a central frequency point (f1+ f0) is 190MHz can be obtained after modulation by the first channel modulator 110, a central frequency point (f2-f0) is a second intermediate frequency band of 85MHz and a second image intermediate frequency band in which a central frequency point (f2+ f0) is 265MHz, and a central frequency point (f3-f0) is a third intermediate frequency band of 295MHz and a central frequency point (f3+ f0) is 475 MHz; at this time, if a first mirror image intermediate frequency band with a central frequency point (f1+ f0) of 190MHz, a second mirror image intermediate frequency band with a central frequency point (f2+ f0) of 265MHz, and a third intermediate frequency band with a central frequency point (f3-f0) of 295MHz are obtained as a third required intermediate frequency band, the central frequency fv1 of the first band pass filter should meet the condition that Gap21/fv1 is greater than 6%, wherein Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f0-B ═ 45 MHz; assuming that the center frequency fv1 of the first bandpass filter is fv1 ═ f3-f0- (f2+ f0))/2+ (f2+ f0) ═ 280MHz, the third desired intermediate frequency band can be obtained. The third desired intermediate frequency band is modulated by the second channel modulator 130 with the first high-frequency modulation frequency f5 being 680MHz, and then a third desired high-frequency band and a third mirror image desired high-frequency band are output; the high-frequency bands required by the third mirror image are 3 bands with the center frequencies of 870MHz, 945MHz and 975MHz and the bandwidth of 60MHz respectively. The high frequency band required by the third image is filtered by the second band-pass filter 140 and then output.
Referring to fig. 4, the first channel modulator 110 modulates a baseband frequency band with a center frequency point f0 into a first intermediate frequency band with center frequency points f1-f0 and a first mirror image intermediate frequency band with a center frequency point f1+ f0 by using a first intermediate frequency modulation frequency f 1; the first channel modulator 110 modulates the baseband frequency band with the center frequency point f0 into a second intermediate frequency band with the center frequency point f2-f0 and a second mirror image intermediate frequency band with the center frequency point f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth; the first channel modulator 110 modulates the baseband frequency band with a center frequency point of f0 into a third intermediate frequency band with center frequency points of f3-f0 and a third mirror image intermediate frequency band with center frequency points of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P; the first channel modulator 110 modulates the baseband frequency band with a center frequency point of f0 into a fourth intermediate frequency band with center frequency points of f4-f0 and a fourth mirror image intermediate frequency band with center frequency points of f4+ f0 by using a fourth intermediate frequency modulation frequency f 4; f4 ═ f1+5B + 4P; the first band-pass filter 120 filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third mirror image intermediate frequency band, the fourth intermediate frequency band and the fourth mirror image intermediate frequency band to obtain a fourth required intermediate frequency band; the fourth desired intermediate frequency band includes the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band, and the fourth intermediate frequency band; the center frequency of the first band-pass filter is fv 1; the second channel modulator 130 modulates the fourth required intermediate frequency band into a fourth required high frequency band and a fourth mirror image required high frequency band by using the first high frequency modulation frequency f 5; the second band-pass filter 140 outputs the high frequency band required by the fourth image after filtering.
For example: the central frequency point f0 of the baseband frequency band is 90MHz, the bandwidth B of the baseband frequency band is 60MHz, the channel protection bandwidth P is 15MHz, the first intermediate frequency modulation frequency f1 is 100MHz, the second intermediate frequency modulation frequency f2 is 175MHz, the third intermediate frequency modulation frequency f3 is 385MHz, and the fourth intermediate frequency modulation frequency f4 is 460 MHz; then, after being modulated by the first channel modulator 110, a first intermediate frequency band with a central frequency point (f1-f0) of 10MHz and a first mirror image intermediate frequency band with a central frequency point (f1+ f0) of 190MHz can be obtained, a second intermediate frequency band with a central frequency point (f2-f0) of 85MHz and a second mirror image intermediate frequency band with a central frequency point (f2+ f0) of 265MHz can be obtained, a third intermediate frequency band with a central frequency point (f3-f0) of 295MHz and a third mirror image intermediate frequency band with a central frequency point (f3+ f0) of 475MHz can be obtained, and a fourth mirror image intermediate frequency band with a central frequency point (f4-f0) of 370MHz and a central frequency point (f4+ f0) of 550MHz can be obtained; at this time, if a first mirror image intermediate frequency band with a central frequency point (f1+ f0) of 190MHz is obtained, a second mirror image intermediate frequency band with a central frequency point (f2+ f0) of 265MHz is obtained, a third intermediate frequency band with a central frequency point (f3-f0) of 295MHz and a fourth intermediate frequency band with a central frequency point (f4-f0) of 370MHz are taken as a fourth required intermediate frequency band, the central frequency fv1 of the first band pass filter should meet the condition that Gap43 is Gap21/fv1> 6%, wherein Gap43 is Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f0-B is 45 MHz; assuming that the center frequency fv1 of the first bandpass filter is fv1 ═ f3-f0- (f2+ f0))/2+ (f2+ f0) ═ 280MHz, the fourth desired intermediate frequency band can be obtained. The fourth required intermediate frequency band is modulated by the second channel modulator 130 with the first high-frequency modulation frequency f5 being 680MHz, and then a fourth required intermediate frequency band is output; the fourth required high-frequency band is 4 frequency bands with central frequencies of 870MHz, 945MHz, 975MHz and 1050MHz and bandwidths of 60 MHz. The fourth required high frequency band is filtered by the second band-pass filter 140 and then output.
The invention can realize that the EoC terminal works in a plurality of frequency bands by only 2 filters, and does not need to set one filter for each working frequency point of the EoC terminal, thereby greatly saving the cost; moreover, the filter adopted by the invention cannot be difficult to realize along with the rise of the modulation frequency, and is very convenient for market popularization.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (9)
1. An EoC terminal, characterized in that the EoC terminal comprises:
the first channel modulator modulates a baseband frequency band with a central frequency point of f0 into a first intermediate frequency band with central frequency points of f1-f0 and a first mirror image intermediate frequency band with central frequency points of f1+ f0 by using a first intermediate frequency modulation frequency f 1;
the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a second intermediate frequency band with center frequency points of f2-f0 and a second mirror image intermediate frequency band with center frequency points of f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth;
a first band-pass filter for filtering the first intermediate frequency band, the first mirror image intermediate frequency band, the second intermediate frequency band and the second mirror image intermediate frequency band to obtain a first required intermediate frequency band; the first desired intermediate frequency band comprises the first mirror image intermediate frequency band and the second mirror image intermediate frequency band; wherein the center frequency of the first band-pass filter is fv1, and Gap21/fv1 is > 6%, Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f 0-B;
a second channel modulator for modulating the first desired intermediate frequency band into a first desired high frequency band and a first mirror desired high frequency band by using a first high frequency modulation frequency f 5; f5+ f1+ f0>800 MHz;
and the second band-pass filter outputs the high-frequency band required by the first mirror image after filtering.
2. The EoC terminal of claim 1, further comprising:
the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a third intermediate frequency band with center frequency points of f3-f0 and a third mirror image intermediate frequency band with center frequency points of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P;
the first band-pass filter filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band and the third mirror image intermediate frequency band to obtain a third required intermediate frequency band; the third desired intermediate frequency band comprises the first mirror image intermediate frequency band, the second mirror image intermediate frequency band and the third intermediate frequency band; wherein, fv1 ═ (f3-f0- (f2+ f0))/2 ═ (f3-f2-2f0)/2, Gap21/fv1> 6%;
the second channel modulator modulates the third required intermediate frequency band into a third required high frequency band and a third mirror image required high frequency band by using the first high frequency modulation frequency f 5;
and the second band-pass filter outputs the high-frequency band required by the third image after filtering.
3. The EoC terminal of claim 2, further comprising:
the first channel modulator modulates a baseband frequency band with a center frequency point of f0 into a fourth intermediate frequency band with center frequency points of f4-f0 and a fourth mirror image intermediate frequency band with center frequency points of f4+ f0 by using a fourth intermediate frequency modulation frequency f 4; f4 ═ f1+5B + 4P;
the first band-pass filter filters the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third mirror image intermediate frequency band, the fourth intermediate frequency band and the fourth mirror image intermediate frequency band to obtain a fourth required intermediate frequency band; the fourth desired intermediate frequency band includes the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band, and the fourth intermediate frequency band;
the second channel modulator modulates the fourth required intermediate frequency band into a fourth required high frequency band and a fourth mirror image required high frequency band by using the first high frequency modulation frequency f 5;
and the second band-pass filter outputs the high-frequency band required by the fourth mirror image after filtering.
4. The EoC terminal according to any of claims 1 to 3, characterized in that: the second band-pass filter is contained in a combiner, and the combiner is internally or externally arranged on the EoC terminal; the combiner also comprises a low-pass filter; the low-pass filter is used for accessing television signals; and the combiner outputs the output signal of the low-pass filter and the output signal of the second band-pass filter through a coaxial cable.
5. A method for setting an operating frequency band of an EoC terminal is characterized by comprising the following steps:
the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a first intermediate frequency band with central frequency points of f1-f0 and a first mirror image intermediate frequency band with central frequency points of f1+ f0 by using a first intermediate frequency modulation frequency f 1;
the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a second intermediate frequency band with central frequency points of f2-f0 and a second mirror image intermediate frequency band with central frequency points of f2+ f0 by using a second intermediate frequency modulation frequency f 2; f2 is f1+ B + P, where B is the bandwidth of the baseband frequency band and P is the fixed channel protection bandwidth;
the EoC terminal utilizes a first band-pass filter to filter the first intermediate frequency band, the first mirror image intermediate frequency band, the second intermediate frequency band and the second mirror image intermediate frequency band to obtain a first required intermediate frequency band; the first desired intermediate frequency band comprises the first mirror image intermediate frequency band and the second mirror image intermediate frequency band; wherein the center frequency of the first band-pass filter is fv1, and Gap21/fv1 is > 6%, Gap21 ═ f1+ f0- (f2-f0) -B ═ f1-f2+2f 0-B;
the EoC terminal modulates the first required intermediate frequency band into a first required high frequency band and a first mirror image required high frequency band by using a first high frequency modulation frequency f 5; f5+ f1+ f0>800 MHz;
and the EoC terminal outputs the high-frequency band required by the first image by filtering through a second band-pass filter.
6. The method for setting the operating frequency band of the EoC terminal according to claim 5, further comprising:
the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a third intermediate frequency band with central frequency points of f3-f0 and a third mirror image intermediate frequency band with a central frequency point of f3+ f0 by using a third intermediate frequency modulation frequency f 3; f3 ═ f1+4B + 3P;
the EoC terminal utilizes the first band-pass filter to filter the first intermediate frequency band, the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band and the third mirror image intermediate frequency band to obtain a third required intermediate frequency band; the third desired intermediate frequency band comprises the first mirror image intermediate frequency band, the second mirror image intermediate frequency band and the third intermediate frequency band; wherein, fv1 ═ (f3-f0- (f2+ f0))/2 ═ (f3-f2-2f0)/2, Gap21/fv1> 6%;
the EoC terminal modulates the third required intermediate frequency band into a third required high frequency band and a third mirror image required high frequency band by using the first high frequency modulation frequency f 5;
and the EoC terminal outputs the high-frequency band required by the third mirror image by using the second band-pass filter.
7. The method for setting the operating frequency band of the EoC terminal according to claim 6, further comprising:
the EoC terminal modulates a baseband frequency band with a central frequency point of f0 into a fourth intermediate frequency band with central frequency points of f4-f0 and a fourth mirror image intermediate frequency band with a central frequency point of f4+ f0 by using a fourth intermediate frequency modulation frequency f 4; f4 ═ f1+5B + 4P;
the EoC terminal uses the first band-pass filter to filter the first intermediate frequency band, the first mirror intermediate frequency band, the second mirror intermediate frequency band, the third mirror intermediate frequency band, the fourth intermediate frequency band and the fourth mirror intermediate frequency band to obtain a fourth required intermediate frequency band; the fourth desired intermediate frequency band includes the first mirror image intermediate frequency band, the second mirror image intermediate frequency band, the third intermediate frequency band, and the fourth intermediate frequency band;
the EoC terminal modulates the fourth required intermediate frequency band into a fourth required high frequency band and a fourth mirror image required high frequency band by using the first high frequency modulation frequency f 5;
and the EoC terminal outputs the high-frequency band required by the fourth mirror image by using the second band-pass filter.
8. The method for setting the operating frequency band of the EoC terminal according to any one of claims 5 to 7, wherein: the second band-pass filter is contained in a combiner, and the combiner is internally or externally arranged on the EoC terminal; the combiner also comprises a low-pass filter; the low-pass filter is used for accessing television signals; and the combiner outputs the output signal of the low-pass filter and the output signal of the second band-pass filter through a coaxial cable.
9. The method for setting the operating frequency band of the EoC terminal according to any one of claims 5 to 7, wherein: the first band-pass filter is replaced with a second high-pass filter.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546173A (en) * | 2012-07-11 | 2014-01-29 | 中兴通讯股份有限公司 | Broadband receiver, anti-interference filter circuit of broadband receiver and implementation method of anti-interference filter circuit |
| CN105577219A (en) * | 2014-10-10 | 2016-05-11 | 中国科学院上海高等研究院 | A Broadband Transceiver Applied to Wired Coaxial Ethernet |
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| US9413325B2 (en) * | 2014-07-01 | 2016-08-09 | Time Warner Cable Enterprises Llc | Switchless multiband filter architecture |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546173A (en) * | 2012-07-11 | 2014-01-29 | 中兴通讯股份有限公司 | Broadband receiver, anti-interference filter circuit of broadband receiver and implementation method of anti-interference filter circuit |
| CN105577219A (en) * | 2014-10-10 | 2016-05-11 | 中国科学院上海高等研究院 | A Broadband Transceiver Applied to Wired Coaxial Ethernet |
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Effective date of registration: 20220407 Address after: Room 2251, hatch Eagle building, No. 99, Tuanjie Road, yanchuang Park, Nanjing area, China (Jiangsu) pilot Free Trade Zone, Nanjing, Jiangsu 210000 Patentee after: Nanjing Jinzhen Microelectronics Technology Co.,Ltd. Address before: 201210 3rd floor, building 1, No.400, Fangchun Road, China (Shanghai) pilot Free Trade Zone, Pudong New Area, Shanghai Patentee before: SHANGHAI JINZHEN SEMICONDUCTOR TECHNOLOGY CO.,LTD. |