CN105453441A - Signal processing method, apparatus, and system - Google Patents
Signal processing method, apparatus, and system Download PDFInfo
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- CN105453441A CN105453441A CN201480009357.4A CN201480009357A CN105453441A CN 105453441 A CN105453441 A CN 105453441A CN 201480009357 A CN201480009357 A CN 201480009357A CN 105453441 A CN105453441 A CN 105453441A
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Abstract
Disclosed are a signal processing method, apparatus, and system. The apparatus comprises: an analog-to-digital converter (ADC), configured to sample an upstream signal of a cable television cable, to obtain a sampled signal, and send the sampled signal to a digital frequency-conversion unit; and the digital frequency-conversion unit, configured to frequency-convert the received sampled signal to obtain a frequency-converted signal, and send the frequency-converted signal to an external ADC interface of an upstream physical layer device, a frequency of the frequency-converted signal being within a first band supported by the upstream physical layer device. In embodiments of the present invention, an external ADC is used to sample an upstream signal, and a digital frequency-conversion unit performs frequency-conversion processing on a sampled signal, so that in the upstream signal, a signal whose frequency is not within a band supported by a US PHY can be processed by the US PHY. In this way, a US PHY chip does not need to be redesigned, and an existing US PHY can be flexibly used to implement expansion of an upstream band.
Description
The methods, devices and systems technical field of signal transacting
The present invention relates to communication technical field, in particular it relates to the methods, devices and systems of signal transacting.Background technology
In cable of cable TV（Cable) field, main communication technology standard is the good business interface specification of data over cable month（DOCSIS, Data Over Cable Service Interface Specifications).
DOCSIS uses FDD（FDD, Frequency Division Duplex) technology, according to European standard, traditional band downlink uses 87MHZ-862MHZ, and uplink band uses 5MHZ-65MHZ.Uplink band is divided into multiple passages again, and each passage takes certain frequency spectrum.According to standard, the frequency spectrum that passage takes can be 200KHZ, 400KHZ, 800KHZ, 1.6MHZ, 3.2MHZ and 6.4MHZ.
Upper line frequency language can use 5MHZ-65MHZ, but on Cable, below 25MHZ frequency spectrum will not typically be used due to disturbing than more serious, therefore the frequency range that can be used is less.With the increase to upstream bandwidth demand, many operators want to extension uplink spectrum to support higher bandwidth, for example, it is desired to which the upper limit of uplink spectrum is expanded into 85MHZ, the frequency of even more high by 65MHZ.
According to DOCSIS, ascending physical signal layer device（US PHY, Upstream Physical Layer Device) it is used to realize up sampling and processing, it is typically provided as independent chip.The main producer for providing US PHY is company of Botong at present（BRCM), such as the device of BCM314x series.Number of channels few US PHY (such as BCM3141, BCM3143）Support for up to arrive 65MHZ, it is impossible to support to arrive 85MHZ, the frequency range of even more high.BRCM BCM3142 devices, can support 85MHZ.But, BCM3142 has 12 data feedback channels, and because port number is than larger, cost is higher, be not appropriate for it is some only need to a small amount of passage, the demand that high band is used.
US PHY (the devices of such as BCM314x series）Inside includes analog-digital converter（ADC, Analog to Digital Converter) module and data processing module.The scope of the sample frequency of internal ADC limits the frequency range for the upward signal that can be supported.Therefore the signal that US PHY can not be not to frequency in the frequency range of support is sampled and handled, it is necessary to redesign US PHY chip.This method cost is high.The content of the invention
The embodiments of the invention provide a kind of methods, devices and systems of signal transacting, the extension of uplink band can be flexibly realized using existing US PHY.
First aspect is connected there is provided a kind of device of signal transacting, the device of the signal transacting with ascending physical signal layer device, and the device includes：Analog-digital converter ADC and digital converter unit, the ADC sample for the upward signal to cable of cable TV, obtain sampled signal, and the sampled signal is sent into digital frequency conversion unit；The digital frequency conversion unit, frequency conversion is carried out for the sampled signal to reception, frequency variation signal is obtained, and the frequency variation signal is sent to the external ADC interface of ascending physical signal layer device, the frequency of the frequency variation signal is in the first frequency range that the ascending physical signal layer device is supported.
With reference to first aspect, in the first possible implementation of first aspect, the digital frequency conversion unit, carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range specifically for the part signal being not to frequency in the sampled signal in first frequency range.
With reference to the first possible implementation of first aspect, in second of possible implementation of first aspect, the digital frequency conversion unit includes：High-pass filtering subelement, for carrying out high-pass filtering to the part signal, obtains the first signal；Frequency language moves subelement, for the frequency language of first signal to be moved in first frequency range, obtains secondary signal.
With reference to second of possible implementation of first aspect, in the third possible implementation of first aspect, the digital frequency conversion unit also includes：LPF subelement, for carrying out LPF to the secondary signal, obtains the 3rd signal.
With reference to the third possible implementation of first aspect, in the 4th kind of possible implementation of first aspect, the digital frequency conversion unit also includes：Lower swab unit, for taking out operation under being carried out to the 3rd signal, obtains the 4th signal, the sample frequency of the 4th signal is in the range of the sample frequency that the ascending physical signal layer device is supported.
Second aspect includes there is provided a kind of method of signal transacting, this method：The upward signal of cable of cable TV is sampled, sampled signal is obtained；Frequency conversion is carried out to the sampled signal, frequency variation signal is obtained, the frequency of the frequency variation signal is in the first frequency range that ascending physical signal layer device is supported；The frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device by the digital frequency conversion unit.
With reference to second aspect, in the first possible implementation of second aspect, this pair sampled signal carries out frequency conversion, including：The part signal being not to frequency in the sampled signal in first frequency range carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range.
With reference to the first possible implementation of second aspect, in second of possible implementation of second aspect, the part signal that frequency is not in first frequency range in this pair sampled signal becomes
Frequently, including：High-pass filtering is carried out to the part signal, the first signal is obtained；The frequency language of first signal is moved in first frequency range, secondary signal is obtained.
With reference to second of possible implementation of second aspect, in the third possible implementation of second aspect, this method also includes carrying out LPF to the secondary signal, obtains the 3rd signal.
With reference to the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect, this method also includes taking out operation under carrying out the 3rd signal, the 4th signal is obtained, the sample frequency of the 4th signal is in the range of the sample frequency that the ascending physical signal layer device is supported.
The third aspect, there is provided a kind of system of signal transacting, the system includes the device and ascending physical signal layer device of signal transacting, the device of the signal transacting is connected with the ascending physical signal layer device, wherein, the device of the signal transacting includes analog-digital converter ADC and digital converter unit, and the ascending physical signal layer device includes external ADC interface；The ADC, samples for the upward signal to cable of cable TV, obtains sampled signal, and the sampled signal is sent into digital frequency conversion unit；The digital frequency conversion unit, frequency conversion is carried out for the sampled signal to reception, frequency variation signal is obtained, and the frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device, the frequency of the frequency variation signal is in the first frequency range that the ascending physical signal layer device is supported；The ascending physical signal layer device, for carrying out data processing to the frequency variation signal received.
The embodiment of the present invention is sampled using external ADC to upward signal, and carries out frequency-conversion processing to the signal after sampling by digital frequency conversion unit so that in upward signal frequency be not at the signals of frequency range of US PHY supports can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, the required accompanying drawing used in the embodiment of the present invention will be briefly described below, apparently, drawings described below is only some embodiments of the present invention, for those of ordinary skill in the art, on the premise of not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the block diagram of the device of the signal transacting of one embodiment of the invention.
Fig. 2 is the block diagram of the device of the signal transacting of another embodiment of the present invention.
Fig. 3 is the example block diagram of the digital frequency conversion unit of another embodiment of the present invention.
Fig. 4 is the indicative flowchart of the method for the signal transacting of one embodiment of the invention.
Fig. 5 is the example block diagram of the system of the signal transacting of one embodiment of the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made should all belong to the scope of protection of the invention.
It should be understood that the technical scheme of the embodiment of the present invention can apply to various communication systems, such as：Global system for mobile telecommunications（GSM, Global System of Mobile communication) system, CDMA（CDMA, Code Division Multiple Access) system, WCDMA（WCDMA Wideband Code Division Multiple Access) system, GPRS（GPRS, General Packet Radio Service), Long Term Evolution (LTE, Long Term Evolution) system, LTE FDDs（FDD, Frequency Division Duplex) system, LTE time division duplexs（TDD, Time Division Duplex), UMTS（UMTS, Universal Mobile Telecommunication System) or global interconnection ripple access (WiMAX, Worldwide Interoperability for Microwave Access) communication system etc..
Fig. 1 is the block diagram of the device of the signal transacting of one embodiment of the invention.The device 10 of signal transacting shown in Fig. 1 is connected with ascending physical signal layer device, and the device 10 includes analog-digital converter ADC 11 and digital converter unit 12.
ADC 11 is used to sample to the upward signal of cable of cable TV, obtains sampled signal, and the sampled signal is sent into digital frequency conversion unit 12.
Digital frequency conversion unit 12 is used to carry out frequency conversion to the sampled signal of reception, obtains frequency variation signal, and the frequency variation signal is sent to the external ADC interface of ascending physical signal layer device.The frequency of the frequency variation signal is in the first frequency range that ascending physical signal layer device is supported.
The embodiment of the present invention is sampled using external ADC to upward signal, and carries out frequency-conversion processing to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
The embodiment of the present invention is not restricted to ADC specific works mode.For example, the embodiment of the present invention can use the existing method of sampling, according to the frequency of upward signal, selection sample frequency is sampled to the upward signal.
ADC 11 can be connected by digital interface with digital frequency conversion unit 12, in the case, ADC
The sampled signal can be sent to digital frequency conversion unit 12 by 11 by digital interface.Alternatively, the sampled signal can also be sent to digital frequency conversion unit 12 by ADC 11 using wireless transmissioning mode.The embodiment of the present invention is not limited the mode that sampled signal is sent to digital frequency conversion unit 12.
It should be understood that the upward signal of cable of cable TV potentially includes the signal of multiple frequencies.For example, the signal that frequency is in the first frequency range that US PHY are supported can be included in upward signal, the signal that frequency is not in the first frequency range of US PHY supports can also be included.
Upward signal is after over-sampling, and frequency does not change.Therefore, the composition in the first frequency range is not at for frequency in upward signal, still data processing can not be carried out by the data processing module inside US PHY after over-sampling.
Alternatively, as one embodiment, the signal in the first frequency range is not at for frequency in upward signal, the embodiment of the present invention can carry out frequency-conversion processing using the signal after the 12 pairs of samplings of digital frequency conversion unit.So that the frequency variation signal after frequency-conversion processing is in the first frequency range, such US PHY data processing module can carry out data processing to frequency variation signal.
Alternatively, it is used as another embodiment, the signal in the first frequency range is in for frequency in upward signal, digital frequency conversion unit 12 in the embodiment of the present invention can not also carry out frequency-conversion processing to the signal after sampling, only pass through " transparent transmission " mode and the signal after sampling is sent to US PHY, such US PHY data processing module directly can carry out data processing to the signal after sampling.
Certainly, the embodiment of the present invention unified to upward signal can also carry out frequency-conversion processing, and do not differentiate between the composition for being located at the composition in the first frequency range in upward signal and not being located in the first frequency range, it is only necessary to ensure that the signal after frequency conversion is each fallen within the first frequency range.
At present, ascending physical signal layer device US PHY are used to upward signal is sampled and handled, for example BCM314x family devices common at present.Generally, US PHY can include ADC and data processing module.It is respectively used to sample to upward signal and handled.If the frequency of upward signal is not in the frequency range of ascending physical signal layer device US PHY supports, the US PHY can not be sampled and be handled to the upward signal.
On the other hand, the US PHY of BCM314x series can select bypass the ADC of inside using internal ADC and sample to upward signal by external ADC.Such US PHY for supporting external ADC have external ADC interface, can receive the sampled signal that external ADC is obtained, and follow-up data processing is carried out by US PHY data processing module.
It should be understood that the upward signal of the embodiment of the present invention can be by radiofrequency signal by obtained by power amplification.Radiofrequency signal inputs (RF IN, Radio Frequency Input) interface by the radio frequency of amplifier and inputted
Power amplification is carried out to amplifier, requirements of the ADC 11 in sampling to the power of input signal can be met.
The embodiment of the present invention can be using the US PHY for supporting external ADC.The embodiment of the present invention can select the ADC that can be sampled to the upward signal of the frequency according to the frequency of the upward signal.
Alternatively, as one embodiment.The part signal that digital frequency conversion unit 12 can be not to frequency in the sampled signal in first frequency range carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range.
Digital frequency conversion unit 12 can have whether the frequency for judging sampled signal is in the function in the first frequency range.For example, the arbitration functions can be realized by the embedded software in digital frequency conversion unit 12 or firmware code, arbitration functions can also be completed by hardware device, the embodiment of the present invention is not restricted to this.
Frequency is not at the part signal in first frequency range in upward signal, can be that the frequency of the part signal is less than the low-limit frequency of first frequency range higher than the highest frequency of first frequency range or the frequency of the part signal.
Part signal for frequency higher than the highest frequency of first frequency range, digital frequency conversion unit 12 can carry out frequency redution operation to the part signal；Part signal for frequency less than the low-limit frequency of first frequency range, digital frequency conversion unit 12 can carry out raising frequency operation to the part signal.The final signal frequency caused after frequency reducing or raising frequency is in the first frequency range.
Optionally, the part signal that the embodiment of the present invention can also be only to frequency in the sampled signal higher than the highest frequency of first frequency range carries out frequency reducing.The frequency redution operation can be not specifically limited from frequency reducing technology conventional at present, the embodiment of the present invention to the method for frequency reducing.
Alternatively, it is used as another embodiment, the part signal that the embodiment of the present invention can also be less than the low-limit frequency in the first frequency range to frequency in sampled signal carries out raising frequency, so that the signal frequency after raising frequency is in the first frequency range, in order to carry out data processing by US PHY data processing module.
Certainly, the embodiment of the present invention unified to upward signal can also carry out frequency-conversion processing, without performing the composition that above-mentioned judgment step is located in the first frequency range to distinguish in upward signal and the composition not being located in the first frequency range, it is only necessary to ensure that the signal after frequency conversion is each fallen within the first frequency range.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Alternatively, as one embodiment, the embodiment of the present invention can select BCM3142 devices.BCM3142 devices can support 85MHZ.The external ADC interface and corresponding digital frequency conversion unit for supporting 85MHZ frequencies above can be used in the embodiment of the present invention, so that supporting more than 85MHZ upward signal frequency in the case where not replacing BCM3142 devices.
Alternatively, as another embodiment, the embodiment of the present invention can from BCM3141 or
BCM3143 devices.Such device can support 65MHZ and port number is few.The external ADC interface and corresponding digital frequency conversion unit for supporting 65MHZ frequencies above can be used in the embodiment of the present invention, so that supporting more than 65MHZ upward signal frequency in the case where not replacing BCM3141 or BCM3143 devices, the few port number of needs, the scene of high band operation can be met simultaneously.
Fig. 2 is the block diagram of the signal processing apparatus of another embodiment of the present invention.Signal processing apparatus shown in Fig. 2 includes analog-digital converter ADC 11, digital frequency conversion unit 12, amplifier 13, US PHY 14 and medium education（MAC, Media Access Control) processing module 15.It should be noted that in Fig. 2, using identical reference with Fig. 1 identicals unit, and therefore omit repetitive description.
13 pairs of amplifier carries out power amplification processing from the cable radiofrequency signals received, and sends the signal after the amplification and handled to ADC 11.
Upward signal can carry out power amplification, to meet sample requirement before being sampled.Radiofrequency signal can be input to amplifier by the RF IN interfaces of amplifier and carry out power amplification, the radiofrequency signal input ADC 11 after power amplification.
11 pairs of signals received from amplifier 13 of ADC are sampled, and obtain sampled signal.
The uplink spectrum scope selection sample frequency that ADC 11 can be supported according to actual needs, for example, can select suitable sample frequency according to the frequency of upward signal to be sampled.For example, the peak frequency for the uplink spectrum if desired supported is 85MHZ, sample frequency can select 204.8MHZ.The selection principle of the 204.8MHZ can be：Sample frequency satisfaction is 10.24MHZ multiple；The sample frequency is more than twice of signal frequency to be sampled；The sample frequency meets the demand of protection band.
Sampled signal is sent to digital frequency conversion module 12 by ADC 11 by digital interface.
It should be understood that the digital interface is the interface that the external ADC of the embodiment of the present invention can be provided, such as low-voltage differential signal（LVDS, Low Voltage Differential Signal) interface etc..
Digital frequency conversion module 12 carries out frequency conversion to sampled signal, obtains frequency variation signal.
Alternatively, as one embodiment, the embodiment of the present invention can select uplink band support 65MHZ US PHY, such as BCM3141, BCM3143 etc..The numeric field frequency language for the part signal that frequency in sampled signal can be higher than more than 65MHZ by digital frequency conversion module 12 moves below 65MHZ,
To cause the frequency range of sampled signal to be in the frequency range that the US PHY are supported.
Alternatively, as another embodiment, the embodiment of the present invention can select uplink band support 85MHZ US PHY, such as BCM3142.The numeric field frequency language for the part signal that frequency in sampled signal can be higher than more than 85MHZ by digital frequency conversion module 12 moves below 85MHZ, to cause the frequency range of sampled signal to be in the frequency range that the US PHY are supported.
Digital frequency conversion module 12 is by supporting external ADC US PHY 14 external ADC interface to US PHY 14 to send the frequency variation signal.
Supporting external ADC US PHY 14 has external ADC interface.Digital frequency conversion module 12 can by external ADC interface to the US PHY 14 send frequency variation signal.The US PHY 14 can include ADC and data processing module.When the frequency of frequency variation signal is in the frequency range that the US PHY 14 can be supported, the US PHY 14 can carry out data processing to the frequency variation signal.
MAC processing modules 15 are sent to after 14 pairs of frequency-variable modules progress data processings of US PHY to handle.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Fig. 3 is the example block diagram of the digital frequency conversion unit 12 of another embodiment of the present invention.Digital frequency conversion unit 12 can include high-pass filtering subelement 121, frequency spectrum shift subelement 122, LPF subelement 123 and lower swab unit 124.As shown in figure 3, digital frequency conversion unit 12 can carry out upconversion operation to sampled signal.
High-pass filtering subelement 121 is used to carry out high-pass filtering to part signal, obtains the first signal.Frequency language, which moves subelement 122, to be used to move the frequency language of first signal into the first frequency range, obtains secondary signal.
121 pairs of part signals of high-pass filtering subelement carry out high-pass filtering, can filter out in part signal
Ο-fMHZ signal.Wherein f can be the fixed frequency set.
Frequency language, which moves 122 pairs of signals filtered out after Ο-fMHZ signal of subelement and enters line frequency language, moves fixed frequency fMHZ so that the frequency of signal after frequency language is moved is in the first frequency range.
Alternatively, as one embodiment, the frequency language of the embodiment of the present invention, which moves subelement 122, to be moved by the way that the first signal is done into multiplying with cos (2*pi*f/fs) to enter line frequency language.Wherein f is the fixed frequency of the setting, and fs is sample frequency.
For example, when uplink band needs to support 85MHZ upward signal, the embodiment of the present invention can select 48 ranks（Taps high-pass filter), to obtain more preferable filter effect.Now f can take 40.96MHZ, fs to take 204.8MHZ, then frequency language, which moves subelement 122, can move 65-85MHZ signal downwards fixed frequency 40.96MHZ to about 24-44MHZ.
LPF subelement 123 is used to carry out LPF to the secondary signal, obtains the 3rd signal.Frequency is larger in the interference of more than 85MHZ signal, thus LPF subelement 123 can filter out the composition of more than 85MHZ in secondary signal, to avoid interference.
For example, when uplink band needs to support 85MHZ upward signal, the embodiment of the present invention can select 24 ranks（Taps low pass filter), has obtained more preferable filter effect.
Lower swab unit 124 is used to take out operation under carrying out the 3rd signal, obtains the 4th signal, and the sample frequency of the 4th signal is in the range of the sample frequency that ascending physical signal layer device is supported.
For example, if uplink band needs to support 85MHZ upward signal, ADC 11 sample frequency can select 204.8MHZ.The selection principle of the 204.8MHZ can be：Sample frequency satisfaction is 10.24MHZ multiple；The sample frequency is more than twice of signal frequency to be sampled；The sample frequency meets the demand of protection band.
Lower swab unit 124 takes out 4/5 under being carried out to sample frequency for 204.8MHZ the 3rd signal, obtains the 4th signal, the sample frequency of the 4th signal is 163.84MHZ.The sample frequency of the 4th signal can be then caused to be in the range of the sample frequency that US PHY are supported.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Fig. 4 is the indicative flowchart of the method for the signal transacting of one embodiment of the invention.
401, the upward signal of cable of cable TV is sampled, sampled signal is obtained.
402, frequency conversion is carried out to sampled signal, frequency variation signal is obtained, the frequency of the frequency variation signal is in the first frequency range that ascending physical signal layer device is supported.
403, frequency variation signal is sent to the external ADC interface of ascending physical signal layer device.
Alternatively, as one embodiment, above-mentioned steps 401 can be performed by analog-digital converter ADC, and step 402 and 403 is performed by digital frequency conversion unit；Fig. 1 is corresponded to, this method can be performed by the device 10 of signal transacting.Or as another embodiment, step 401-403 can be integrated with certain device or equipment of analog-to-digital conversion and digital frequency conversion function to perform by other.
The embodiment of the present invention is sampled using external ADC to upward signal, and carries out frequency-conversion processing to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
The embodiment of the present invention is not restricted to ADC specific works mode.For example, the embodiment of the present invention can use the existing method of sampling, according to the frequency of upward signal, selection sample frequency is sampled to the upward signal.
ADC can be connected by digital interface with digital frequency conversion unit, in the case, and the sampled signal can be sent to digital frequency conversion unit by ADC by digital interface.Alternatively, the sampled signal can also be sent to digital frequency conversion unit by ADC using wireless transmissioning mode.The embodiment of the present invention is not limited the mode that sampled signal is sent to digital frequency conversion unit.
It should be understood that the upward signal of cable of cable TV potentially includes the signal of multiple frequencies.For example, the signal that frequency is in the first frequency range that US PHY are supported can be included in upward signal, the signal that frequency is not in the first frequency range of US PHY supports can also be included.
Upward signal is after over-sampling, and frequency does not change.Therefore, the composition in the first frequency range is not at for frequency in upward signal, still data processing can not be carried out by the data processing module inside US PHY after over-sampling.
Alternatively, as one embodiment, the signal in the first frequency range is not at for frequency in upward signal, the embodiment of the present invention can carry out frequency-conversion processing using digital frequency conversion unit to the signal after sampling.So that the frequency variation signal after frequency-conversion processing is in the first frequency range, such US PHY data processing module can carry out data processing to frequency variation signal.
Alternatively, it is used as another embodiment, the signal in the first frequency range is in for frequency in upward signal, digital frequency conversion unit in the embodiment of the present invention can not also carry out frequency-conversion processing to the signal after sampling, only pass through " transparent transmission " mode and the signal after sampling is sent to US PHY, such US PHY data processing module directly can carry out data processing to the signal after sampling.
Certainly, the embodiment of the present invention unified to upward signal can also carry out frequency-conversion processing, and do not differentiate between the composition for being located at the composition in the first frequency range in upward signal and not being located in the first frequency range, it is only necessary to ensure that the signal after frequency conversion is each fallen within the first frequency range.
At present, ascending physical signal layer device US PHY are used to upward signal is sampled and handled, for example BCM314x family devices common at present.Generally, US PHY can include ADC and data processing module.It is respectively used to sample to upward signal and handled.If the frequency of upward signal is not at
When in the frequency range that ascending physical signal layer device US PHY are supported, then the US PHY can not be sampled and be handled to the upward signal.
On the other hand, the US PHY of BCM314x series can select bypass the ADC of inside using internal ADC and sample to upward signal by external ADC.Such US PHY for supporting external ADC have external ADC interface, can receive the sampled signal that external ADC is obtained, and follow-up data processing is carried out by US PHY data processing module.
It should be understood that the upward signal of the embodiment of the present invention can be by radiofrequency signal by obtained by power amplification.Radiofrequency signal, which inputs (RF IN, Radio Frequency Input) interface by the radio frequency of amplifier and is input to amplifier, carries out power amplification, can meet requirements of the ADC in sampling to the power of input signal.
The embodiment of the present invention can be using the US PHY for supporting external ADC.The embodiment of the present invention can select the ADC that can be sampled to the upward signal of the frequency according to the frequency of the upward signal.
Alternatively, as one embodiment.The part signal that digital frequency conversion unit can be not to frequency in sampled signal in first frequency range carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range.
Digital frequency conversion unit can be first to sampled signal frequency judge.For example, the arbitration functions can be realized by the embedded software in digital frequency conversion unit or firmware code, arbitration functions can also be completed by hardware device, the embodiment of the present invention is not restricted to this.
Frequency is not at the part signal in first frequency range in upward signal, can be that the frequency of the part signal is less than the low-limit frequency of first frequency range higher than the highest frequency of first frequency range or the frequency of the part signal.
Part signal for frequency higher than the highest frequency of first frequency range, digital frequency conversion unit can carry out frequency redution operation to the part signal；Part signal for frequency less than the low-limit frequency of first frequency range, digital frequency conversion unit can carry out raising frequency operation to the part signal.The final signal frequency caused after frequency reducing or raising frequency is in the first frequency range.
Alternatively, the part signal that the embodiment of the present invention can be only to frequency in the sampled signal higher than the highest frequency of first frequency range carries out frequency reducing.The frequency redution operation can be not specifically limited from frequency reducing technology conventional at present, the embodiment of the present invention to the method for frequency reducing.
Alternatively, it is used as another embodiment, the part signal that the embodiment of the present invention can also be less than the low-limit frequency in the first frequency range to frequency in sampled signal carries out raising frequency, so that the signal frequency after raising frequency is in the first frequency range, in order to carry out data processing by US PHY data processing module.
Certainly, the embodiment of the present invention unified to upward signal can also carry out frequency-conversion processing, without performing the composition that above-mentioned judgment step is located in the first frequency range to distinguish in upward signal and the composition not being located in the first frequency range, it is only necessary to ensure that the signal after frequency conversion is each fallen within the first frequency range.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Alternatively, as one embodiment, the embodiment of the present invention can select BCM3142 devices.BCM3142 devices can support 85MHZ.The external ADC interface and corresponding digital frequency conversion unit for supporting 85MHZ frequencies above can be used in the embodiment of the present invention, so that supporting more than 85MHZ upward signal frequency in the case where not replacing BCM3142 devices.
Alternatively, as another embodiment, the embodiment of the present invention can select BCM3141 or BCM3143 devices.Such device can support 65MHZ and port number is few.The external ADC interface and corresponding digital frequency conversion unit for supporting 65MHZ frequencies above can be used in the embodiment of the present invention, so that supporting more than 65MHZ upward signal frequency in the case where not replacing BCM3141 or BCM3143 devices, the few port number of needs, the scene of high band operation can be met simultaneously.
Alternatively, as one embodiment.The embodiment of the present invention is not at the method that part signal in the first frequency range carries out frequency conversion to frequency in sampled signal, can be the part signal is carried out high-pass filtering processing, frequency language move processing, low-pass filtering treatment and under take out processing.
High-pass filtering processing is carried out to part signal, the first signal is obtained.
Alternatively, as one embodiment, the embodiment of the present invention can select high-pass filter to carry out high-pass filtering processing to the part signal, can filter out the signal of Ο-fMHZ in part signal.Wherein f can be the fixed frequency set.
Line frequency language is entered to first signal and moves operation, secondary signal is obtained so that the frequency spectrum of secondary signal is fallen into the first frequency range.Signal after signal to having filtered out Ο-fMHZ carries out frequency spectrum shift fixed frequency fMHZ so that the frequency of signal after frequency language is moved is in the first frequency range.
Alternatively, as one embodiment, the embodiment of the present invention can be moved by the way that the first signal is done into multiplying with cos (2*pi*f/fs) to enter line frequency language.Wherein f is the fixed frequency of the setting, and fs is sample frequency.
For example, when uplink band needs to support 85MHZ upward signal, the embodiment of the present invention can select 48 ranks（Taps high-pass filter), to obtain more preferable filter effect.Now f can take
40.96MHZ, fs can take 204.8MHZ, then frequency spectrum shift operation can move 65-85MHZ signal downwards fixed frequency 40.96MHZ to about 24-44MHZ.
Low-pass filtering treatment is carried out to secondary signal, the 3rd signal is obtained.
The interference of 85MHZ signal is larger, thus low-pass filtering operation can filter out the composition of more than 85MHZ in secondary signal, dry 4 outstanding to avoid.
For example, when uplink band needs to support 85MHZ upward signal, the embodiment of the present invention can select 24 ranks（Taps low pass filter), has obtained more preferable filter effect.
Processing is taken out under being carried out to the 3rd signal, the 4th signal is obtained, the sample frequency of the 4th signal is in the range of the sample frequency that US PHY are supported.
For example, if uplink band needs to support 85MHZ upward signal, ADC sample frequency can select 204.8MHZ, and the selection principle of the 204.8MHZ can be：Sample frequency satisfaction is 10.24MHZ multiple；The sample frequency is more than twice of signal frequency to be sampled；The sample frequency meets the demand of protection band.
4/5 is taken out under being carried out to sample frequency for 204.8MHZ the 3rd signal, obtain the 4th signal, the sample frequency of 4th signal is 163.84MHZ, then the sample frequency of the 4th signal can be caused to be in the range of the sample frequency that ascending physical signal layer device is supported.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Alternatively, as another embodiment.When upward signal is sampled and handled using US PHY, part signal that can be to frequency in upward signal higher than the highest frequency of the first frequency range is sampled, frequency reducing is carried out to the signal after the sampling again so that the signal after frequency reducing can be by supporting the US PHY of external ADC functions to carry out data processing.
Specifically, amplifier carries out power amplification processing to the radiofrequency signal received from cable, and sends the signal after the amplification to ADC processing.
Upward signal can carry out power amplification, to meet sample requirement before being sampled.Radiofrequency signal can be input to amplifier by the RF IN interfaces of amplifier and carry out power amplification, and the radiofrequency signal after power amplification is input to ADC.
ADC samples to the signal received from amplifier, obtains sampled signal.
Uplink spectrum scope that ADC can be supported according to actual needs selection sample frequency, for example can be with
Suitable sample frequency is selected according to the frequency of upward signal to be sampled.For example, the peak frequency for the uplink spectrum if desired supported is 85MHZ, sample frequency can select 204.8MHZ.The selection principle of the 204.8MHZ can be：Sample frequency satisfaction is 10.24MHZ multiple；The sample frequency is more than twice of signal frequency to be sampled；The sample frequency meets the demand of protection band.
Sampled signal is sent to digital frequency conversion module by ADC by digital interface.
It should be understood that the digital interface is the interface that the external ADC of the embodiment of the present invention can be provided, such as low-voltage differential signal（LVDS, Low Voltage Differential Signal) interface etc..
Digital frequency conversion module carries out frequency conversion to sampled signal, obtains frequency variation signal.
Alternatively, as one embodiment, the embodiment of the present invention can select uplink band support 65MHZ US PHY, such as BCM3141, BCM3143 etc..The numeric field frequency language for the part signal that frequency in sampled signal can be higher than more than 65MHZ by digital frequency conversion module moves below 65MHZ, to cause the frequency range of sampled signal to be in the frequency range that the US PHY are supported.
Alternatively, as another embodiment, the embodiment of the present invention can select uplink band support 85MHZ US PHY, such as BCM3142.The numeric field frequency language for the part signal that frequency in sampled signal can be higher than more than 85MHZ by digital frequency conversion module moves below 85MHZ, to cause the frequency range of sampled signal to be in the frequency range that the US PHY are supported.
Digital frequency conversion module is by supporting external ADC US PHY external ADC interface to US PHY to send the frequency variation signal.
Supporting external ADC US PHY has external ADC interface.Digital frequency conversion module can by external ADC interface to the US PHY send frequency variation signal.The US PHY can include ADC and data processing module.When the frequency of frequency variation signal is in the frequency range that the US PHY can be supported, the US PHY can carry out data processing to the frequency variation signal.
US PHY are handled being sent to MAC processing modules after frequency-variable module progress data processing.
Therefore, the embodiment of the present invention is sampled using external ADC to upward signal, and frequency-conversion processing is carried out to the signal after sampling by digital frequency conversion unit so that the signal that frequency is not in the frequency range of US PHY supports in upward signal can be by US PHY processing.This way it is not necessary to redesign US PHY chips, the extension of uplink band can be flexibly realized using existing US PHY.
Fig. 5 is the example block diagram of the system of the signal transacting of one embodiment of the invention.The system includes the device 10 and ascending physical signal layer device 20 of signal transacting, and the device 10 of the signal transacting is connected with the ascending physical signal layer device 20, wherein, the device of the signal transacting includes the Hes of analog-digital converter ADC 11
Digital frequency conversion unit 12, the ascending physical signal layer device 20 includes external ADC interface；The ADC 11, samples for the upward signal to cable of cable TV, obtains sampled signal, and the sampled signal is sent into digital frequency conversion unit 12;The digital frequency conversion unit 12, frequency conversion is carried out for the sampled signal to reception, frequency variation signal is obtained, and the frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device 20, the frequency of the frequency variation signal is in the first frequency range that the ascending physical signal layer device 20 is supported；The ascending physical signal layer device 20, for carrying out data processing to the frequency variation signal received.
It should be understood that during " one embodiment " or " embodiment " that specification is mentioned in the whole text means that the special characteristic relevant with embodiment, structure or characteristic are included at least one embodiment of the present invention.Therefore, " in one embodiment " or " in one embodiment " occurred everywhere in entire disclosure not necessarily refers to identical embodiment.In addition, these specific feature, structure or characteristics can be combined in one or more embodiments in any suitable manner.In various embodiments of the present invention, the size of the sequence number of above-mentioned each process is not meant to the priority of execution sequence, and the execution sequence of each process should be determined with its function and internal logic, and any limit is constituted without tackling the implementation process of the embodiment of the present invention.
In addition, the terms " system " and " network " are often used interchangeably herein.The terms " and/or ", a kind of only incidence relation for describing affiliated partner, expression may have three kinds of relations, for example, A and/or can represent：Individualism, while existing and these three situations of ^ individualisms B.In addition, character "/" herein, typically represent forward-backward correlation object be it is a kind of " or " relation.
It should be understood that in embodiments of the present invention, " B corresponding with A " represents that B is associated with A, and B can be determined according to A.It is also to be understood that determining that B is not meant to determine B only according to A according to A, B can also be determined according to A and/or other information.
Those of ordinary skill in the art can be appreciated that, the unit and algorithm steps of each example described with reference to the embodiments described herein, it can be realized with electronic hardware, computer software or the combination of the two, in order to clearly demonstrate the interchangeability of hardware and software, the composition and step of each example are generally described according to function in the above description.These functions are performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Professional and technical personnel can realize described function to each specific application using distinct methods, but this realization is it is not considered that beyond the scope of this invention.
It is apparent to those skilled in the art that, for convenience of description and succinctly, the specific work process of the system of foregoing description, device and unit may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can realize by another way.For example, device embodiment described above is only schematical, for example, the division of the unit, it is only a kind of division of logic function, there can be other dividing mode when actually realizing, such as multiple units or component can combine or be desirably integrated into another system, or some features can be ignored, or do not perform.In addition, shown or discussed coupling each other or direct close or communication connection can be closed by indirect of some interfaces, device or unit or communication connection or electricity, mechanical or other forms are connected.It can be for the part that unit is shown or may not be physical location, you can with positioned at a place, or can also be distributed on multiple NEs.Some or all of unit therein can be selected to realize the purpose of scheme of the embodiment of the present invention according to the actual needs.
In addition, each functional unit in each embodiment of the invention can be integrated in a processing unit or unit is individually physically present or two or more units are integrated in a unit.Above-mentioned integrated unit can both be realized in the form of hardware, it would however also be possible to employ the form of SFU software functional unit is realized.
Through the above description of the embodiments, it is apparent to those skilled in the art that the present invention can be realized with hardware, or firmware is realized, or combinations thereof mode is realized.When implemented in software, above-mentioned functions can be stored in computer-readable medium or be transmitted as one or more instructions on computer-readable medium or code.Computer-readable medium includes computer-readable storage medium and communication media, and wherein communication media includes being easy to any medium that computer program is transmitted from a place to another place.Storage medium can be any usable medium that computer can be accessed.As example but it is not limited to：Computer-readable medium can include RAM, ROM, EEPROM, CD-ROM or other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can be used in carrying or store with instruct or data structure form desired program code and can by computer access any other medium.In addition.Any connection can be suitably turn into computer-readable medium.If for example, software is to use coaxial cable, optical fiber cable, twisted-pair feeder, Digital Subscriber Line（) or such as wireless technology of infrared ray, radio and microwave etc is transmitted from website, server or other remote sources DSL, then the wireless technology of coaxial cable, optical fiber cable, twisted-pair feeder, DSL or such as infrared ray, wireless and microwave etc be included in belonging to medium it is fixing in.As used in the present invention, disk（) and dish Disk（Disc compression laser disc) is included（CD), laser disc, laser disc, Digital Versatile Disc（DVD), floppy disk and Blu-ray Disc, the replicate data of the usual magnetic of which disk, and dish is then with laser come optical replicate data.Above
Combination should also be as being included within the protection domain of computer-readable medium.
In a word, the preferred embodiment of technical solution of the present invention is the foregoing is only, is not intended to limit the scope of the present invention.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the scope of the protection.
Claims (11)
- Claim1. a kind of device of signal transacting, it is characterised in that described device is connected with ascending physical signal layer device, and described device includes：Analog-digital converter ADC and digital converter unit,The ADC, samples for the upward signal to cable of cable TV, obtains sampled signal, and the sampled signal is sent into digital frequency conversion unit；The digital frequency conversion unit, frequency conversion is carried out for the sampled signal to reception, obtain frequency variation signal, and the frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device, the frequency of the frequency variation signal is in the first frequency range that the ascending physical signal layer device is supported.2. device as claimed in claim 1, it is characterized in that, the digital frequency conversion unit, carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range specifically for the part signal being not to frequency in the sampled signal in first frequency range.3. device as claimed in claim 2, it is characterised in that the digital frequency conversion unit includes：High-pass filtering subelement, for carrying out high-pass filtering to the part signal, obtains the first signal；Frequency language moves subelement, for the frequency language of first signal to be moved in first frequency range, obtains secondary signal.4. device as claimed in claim 3, it is characterised in that the digital frequency conversion unit also includes：LPF subelement, for carrying out LPF to the secondary signal, obtains the 3rd signal.5. device as claimed in claim 4, it is characterised in that the digital frequency conversion unit also includes：Lower swab unit, for taking out operation under being carried out to the 3rd signal, obtains the 4th signal, the sample frequency of the 4th signal is in the range of the sample frequency that the ascending physical signal layer device is supported.6. a kind of method of signal transacting, it is characterised in that including：The upward signal of cable of cable TV is sampled, sampled signal is obtained；Frequency conversion is carried out to the sampled signal, frequency variation signal is obtained, the frequency of the frequency variation signal is in the first frequency range that ascending physical signal layer device is supported；The frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device.7. method as claimed in claim 6, it is characterised in that described to sampled signal progress frequency conversion, including：The part signal being not to frequency in the sampled signal in first frequency range carries out frequency conversion so that the frequency of the part signal after frequency conversion is in first frequency range.8. method as claimed in claim 7, it is characterised in that the part signal being not to frequency in the sampled signal in first frequency range carries out frequency conversion, including： High-pass filtering is carried out to the part signal, the first signal is obtained；The frequency language of first signal is moved in first frequency range, secondary signal is obtained.9. method as claimed in claim 8, it is characterised in that also include：LPF is carried out to the secondary signal, the 3rd signal is obtained.10. method as claimed in claim 9, it is characterised in that also include：Operation is taken out under being carried out to the 3rd signal, the 4th signal is obtained, the sample frequency of the 4th signal is in the range of the sample frequency that the ascending physical signal layer device is supported.11. a kind of system of signal transacting, it is characterised in that device and ascending physical signal layer device including signal transacting, the device of the signal transacting are connected with the ascending physical signal layer device, wherein,The device of the signal transacting includes analog-digital converter ADC and digital converter unit, and the ascending physical signal layer device includes external ADC interface；The ADC, samples for the upward signal to cable of cable TV, obtains sampled signal, and the sampled signal is sent into digital frequency conversion unit；The digital frequency conversion unit, frequency conversion is carried out for the sampled signal to reception, obtain frequency variation signal, and the frequency variation signal is sent to the external ADC interface of the ascending physical signal layer device, the frequency of the frequency variation signal is in the first frequency range that the ascending physical signal layer device is supported；The ascending physical signal layer device, for carrying out data processing to the frequency variation signal received.
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| PCT/CN2014/079558 WO2015188308A1 (en) | 2014-06-10 | 2014-06-10 | Signal processing method, apparatus, and system |
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| CN1545786A (en) * | 2001-08-22 | 2004-11-10 | ADC���ͨ��ϵͳ��˾ | Monitoring upstream frequency band |
| CN101183900A (en) * | 2007-11-23 | 2008-05-21 | 深圳国人通信有限公司 | Baseband extension radio frequency subsystem RRU testing method, system and analog BBU device |
| US20080152056A1 (en) * | 2006-12-20 | 2008-06-26 | Katsumi Watanabe | Wireless Communication Apparatus and Method Thereof |
| CN102210116A (en) * | 2008-11-18 | 2011-10-05 | 日本电气株式会社 | Ofdma wireless communication apparatus, and method for generating learning signal to be used for that wireless communication apparatus to compensate for nonlinear distortions |
| CN102970054A (en) * | 2011-09-02 | 2013-03-13 | 钱国明 | Open type software radio platform method, device and system |
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2014
- 2014-06-10 CN CN201480009357.4A patent/CN105453441A/en active Pending
- 2014-06-10 WO PCT/CN2014/079558 patent/WO2015188308A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1545786A (en) * | 2001-08-22 | 2004-11-10 | ADC���ͨ��ϵͳ��˾ | Monitoring upstream frequency band |
| US20080152056A1 (en) * | 2006-12-20 | 2008-06-26 | Katsumi Watanabe | Wireless Communication Apparatus and Method Thereof |
| CN101183900A (en) * | 2007-11-23 | 2008-05-21 | 深圳国人通信有限公司 | Baseband extension radio frequency subsystem RRU testing method, system and analog BBU device |
| CN102210116A (en) * | 2008-11-18 | 2011-10-05 | 日本电气株式会社 | Ofdma wireless communication apparatus, and method for generating learning signal to be used for that wireless communication apparatus to compensate for nonlinear distortions |
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