CN101938448B - CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and communication system - Google Patents
CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and communication system Download PDFInfo
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Abstract
The invention relates to CFR (Crest Factor Reduction) processing method and device with automatic carrier tracking function and a communication system. The method comprises the following steps of: determining a currently-applied carrier according to the energy of carriers and acquiring frequency point information of the currently-applied carrier; setting filter coefficient combination to be applied by CFR according to frequency point information of the currently-applied carrier and carrying out CFR treatment. In the method, the currently-applied carrier can be determined according to the signal energy of all carriers, and the frequency point information of the currently-applied carrier can be obtained after the currently-applied carrier is determined, therefore, the filter coefficient combination to be applied by the CFR can be accurately set according to the frequency point information so as to carry out the CFR treatment. Therefore, the invention ensures the normal application of the CFR function, avoids the defect that the CFR technology can not be correctly used since the carrier frequency point information can not be acquired, promotes the system performance and has better application prospect and popularization value.
Description
Technical field
The present invention relates to wireless communication technology field, the digital processing field of radio communication particularly is specifically related to a kind of CFR processing method with automatic carrier track function, has the CFR processing unit of automatic carrier track function and the communication system with automatic carrier track function.
Background technology
Fast development along with mobile communication, in 2G and the 3G communications field, the application of multicarrier system is comparatively extensive, be compared to single-carrier system, multicarrier system is owing to there being a plurality of carrier signals to superpose on time domain, has higher PAPR (papr, Peak to Average Power Ratio is referred to as peak-to-average force ratio or PAPR).and for the system of 3G standard, comprise WCDMA, the system of CDMA2000 and three kinds of standards of TD-SCDMA, the PAPR of single-carrier signal itself is just higher, if multicarrier system, PAPR will be higher, therefore, in the 3G system, signal for undistorted these PAPR of transmission, linearity to some parts requires very high, PA (PA:Power Amplifier for example, power amplifier), if the excursion of signal exceeds the range of linearity of device, will produce obvious inband distortion and out-of-band radiation, thereby cause the rising of the error rate, reduce systematic function, the size of PAPR has direct impact to the multicarrier system performance.Therefore, effectively reduce the PAPR of system, just seem very necessary, this is directly connected to performance and the cost of whole system.
Thus, for the demand to the PAPR that reduces system, one of technology of following the 3G system applies is exactly peak clipping CFR (Crest Factor Reduction, crest factor reduces) technology, this be because, if signal not being carried out CFR processes, can't avoid the non-linear and efficiency of PA, for the performance that promotes the 3G system and the efficient of PA, must pass through in conjunction with the CFR technology, to reduce the peak-to-average power ratio of signal, reduce the non-linear mis-behave that causes and Efficiency Decreasing problem due to PA.
In present application, use more CFR technology and mainly contain two kinds: Peak Window CrestFactor Reduction (is called for short: PW-CFR) (be called for short: PC-CFR) with Peak Cancellation Crest Factor Reduction.For the PW-CFR technology, it need not to obtain corresponding carrier frequency point information, and because the inner filter order that uses of CFR is low, the time delay of introducing is also fewer, has certain using value for the lower occasion of ask for something, but due to its peak clipping performance a little less than, reduction PAPR that can only be less, and easily cause out of band spectrum to be revealed, therefore, less use in present application.
And for the PC-CFR technology, due to its peak clipping better performances, be applicable to all standards, and comprise 2G and 3G, applicable too to single carrier and multicarrier, therefore, in present practical application, use more extensively, be one of technology of 3G VS .NET Prerequisites.But the PC-CFR technology also has some to use drawback, it need to know the frequency point information of corresponding carrier wave accurately, so that the form of the filter coefficient combination of adopting in definite PC-CFR, otherwise, if it is improper that the filter coefficient combination is adopted, to produce the channel that there is no carrier wave and disturb, reduce systematic function.
In the Combination application of BBU-RRU, CFR holds for RRU, and be the device that produces signal due to BBU, can know exactly the carrier frequency point information of the signal that self produces, thereby can be by the host-host protocol between BBU and RRU with the carrier frequency point communication to RRU, the RRU end obtains corresponding carrier frequency point information, and the needed filter coefficient combination of CFR can be set accurately, realizes correct CFR function.And for the occasion beyond BBU-RRU, for example: digital RF far-drawing system, digital direct discharging station or digital radio repeater, because the relay of digital high-frequency amplification station or digital radio repeater generally can't obtain corresponding carrier frequency point information, cause can't be correct the combination of the needed filter coefficient of CFR is set, thereby also cause greatly reducing the performance of CFR, directly affect the overall performance of system.
Summary of the invention
For above-mentioned problems of the prior art, the object of the present invention is to provide a kind of CFR processing method with automatic carrier track function, have the CFR processing unit of automatic carrier track function and the communication system with automatic carrier wave function, it can be from the frequency point information of carrier wave corresponding to motion tracking, thereby the needed filter coefficient combination of CFR is set exactly, guarantee the normal use of CFR function, the elevator system performance.
For achieving the above object, the present invention by the following technical solutions:
A kind of CFR processing method with automatic carrier track function comprises step:
Determine the carrier wave used according to the energy of carrier wave, obtain the frequency point information of the carrier wave of using;
According to the frequency point information of the described carrier wave of using, the filter coefficient combination of the required application of CFR is set, carry out CFR and process.
A kind of CFR processing unit with automatic carrier track function comprises:
Automatically the carrier track subsystem, be used for the carrier wave used definite according to the energy of carrier wave, obtains the frequency point information of the carrier wave of using, and the frequency point information of this carrier wave of using is exported to the CFR subsystem;
The CFR subsystem is used for the frequency point information according to the described carrier wave of using, and the filter coefficient combination of the required application of CFR is set, and carries out CFR and processes.
A kind of communication system with automatic carrier track function comprises the CFR processing unit with automatic carrier track function as above.
According to the invention described above scheme, it is to determine the current carrier wave that is using according to the signal energy of each carrier wave, after having determined the current carrier wave that is using, can obtain the frequency point information of this carrier wave that is using, thereby can set out exactly according to this frequency point information the filter coefficient combination of the required application of CFR, carrying out CFR processes, guarantee the normal use of CFR function, avoided causing correctly to use because obtaining carrier frequency point information the defective of CFR technology, promote systematic function, had application prospect and promotional value preferably.
Description of drawings
Fig. 1 is the schematic flow sheet with CFR processing method embodiment of automatic carrier track function of the present invention;
Fig. 2 is the structural representation with CFR processing unit embodiment of automatic carrier track function of the present invention;
Fig. 3 is the structural representation with CFR processing unit of automatic carrier track function of the present invention under a kind of mode therein;
Fig. 4 is the schematic diagram when the CFR processing unit with automatic carrier track function of the present invention is applied to digital radio repeater system;
The of the present invention structural representation with CFR processing unit of automatic carrier track function of Fig. 5 under another mode;
Fig. 6 is the down link digital processing principle schematic of digital optical fiber direct station of the prior art or digital RF far-drawing system;
Fig. 7 is the down link digital processing principle schematic when being applied to the CFR processing unit with automatic carrier track function of the present invention in digital optical fiber repeater system or digital RF far-drawing system.
Embodiment
Below in the mode of specific embodiment, the solution of the present invention is described in detail.
As shown in Figure 1, be the schematic flow sheet of the CFR processing method with automatic carrier track function of invention, it comprises step:
Step S101: determine the carrier wave used according to the energy of carrier wave, obtain the frequency point information of the carrier wave of using, enter step S102;
Step S102: according to the frequency point information of the described carrier wave of using, the filter coefficient combination of the required application of CFR is set, carries out CFR and process.
Accordingly, it is to determine the current carrier wave that is using according to the signal energy of each carrier wave, after having determined the current carrier wave that is using, can obtain the frequency point information of this carrier wave that is using, thereby can set out exactly according to this frequency point information the filter coefficient combination of the required application of CFR, carry out CFR and process, guarantee the normal use of CFR function, promoted systematic function.
Wherein, after the frequency point information of the carrier wave that has obtained using, the process of the filter system combination of the required application of CFR is set according to the frequency point information of the carrier wave of using, can be to realize with existing mode, for example in front described PC-CFR technology, will not add to give unnecessary details to this process at this.
And wherein determine the carrier wave of using, the process of obtaining the frequency point information of the carrier wave of using different implementation methods to be arranged according to the energy of carrier wave, different implementation methods goes for different communication standards:
A kind of implementation wherein, by agreement is carried out dissection process, obtain the SCH channel information of using, then big or small according to the energy of each SCH channel, the carrier channel that maximum and energy value is defined as using greater than the SCH channel of predetermined threshold value with energy value, and can learn the carrier wave that is using accordingly.This implementation goes for the standards such as GSM, DCS, CDMA.Specifically, take the GSM standard as example, by the SCH channel information that gsm protocol is carried out dissection process, obtain using, and obtain the channel energy of each channel, sort according to the size of energy value, preferentially select the large channel of energy; If the energy of two adjacent channels is all larger, stay that large channel of energy, reject that channel of energy less; , directly reject this channel, thereby retain useful channel less than the predetermined threshold value of setting when channel energy; Thereby finally determine the channel that remains, that energy value is greater than the channel of predetermined threshold value and energy value maximum, and the carrier channel that this channel is defined as using, and learn accordingly the carrier wave that is using, realize the accurate identification to the carrier wave that is using.After having determined the carrier wave that is using, just can further determine corresponding carrier frequency point information, determine that according to carrier wave the process of the frequency point information of carrier wave can adopt existing mode in prior art, do not repeat them here.
This implementation preferably is applied to digital radio repeater system, can have application prospect preferably at digital radio repeater system.This be because, in digital radio repeater system, there is extraneous wireless signal, the interference that is subject to is more, signal strength signal intensity is also suddenly big or suddenly small, to having relatively high expectations of automatic carrier track, and by the dissection process to agreement, can have interference free performance preferably, can guarantee to capture exactly corresponding carrier frequency point information.
And another determines the carrier wave of using, the implementation of obtaining the frequency point information of the carrier wave of using according to the energy of carrier wave, to process by the digital signal after the A/D conversion being carried out Digital Down Convert, obtain corresponding baseband signal, add up the signal energy of each baseband signal, with signal energy greater than predetermined threshold value and the carrier wave that is defined as using greater than carrier wave corresponding to the baseband signal of default disparity threshold with the difference of the signal energy of adjacent any one carrier wave.This implementation is equally applicable to the communication standards such as GSM, DCS, CDMA, also is applicable to WCDMA, CDMA2000, Wimax and TD-SCDMA communication standard simultaneously.specifically, be based on the mode decision scheme of energy statistics, to the digital signal after the A/D conversion, carrying out Digital Down Convert processes, also namely carry out mixing, extract and the filtering processing, obtain corresponding baseband signal, the energy of statistics baseband signal, the size of the energy of two carrier waves that simultaneously also statistics is adjacent with this baseband signal left and right, as long as satisfy simultaneously following three conditions, can judge that this baseband signal is effective carrier wave, be the current carrier wave that is using: the signal energy of current carrier wave is greater than the predetermined threshold value of setting, the signal energy of this carrier wave is larger than the signal energy of two carrier waves in left and right that are adjacent, and the difference of the signal energy of two carrier waves that current carrier wave and left and right are adjacent is greater than default disparity threshold, thereby realize the accurate identification to the carrier wave that is using.After having determined the carrier wave that is using, just can further determine corresponding carrier frequency point information, determine that according to carrier wave the process of the frequency point information of carrier wave can adopt existing mode in prior art, do not repeat them here.
This implementation, preferably be applicable to digital optical fiber direct station and digital RF far-drawing system, this be because, the downstream signal of the direct-coupling base station, relay in digital optical fiber direct station or digital RF far-drawing system, this signal stabilization and power are larger, are suitable for carrying out the automatic carrier track processing of this mode.
The CFR processing method of carrier track function automatic according to having of the invention described above, the present invention also provides a kind of CFR processing unit with automatic carrier track function.
As shown in Figure 2, be the structural representation with CFR processing unit embodiment of automatic carrier track function of the present invention, it comprises:
Automatically carrier track subsystem 201, be used for the carrier wave used definite according to the energy of carrier wave, obtains the frequency point information of the carrier wave of using, and the frequency point information of this carrier wave of using is exported to CFR subsystem 202;
Accordingly, it is to determine the current carrier wave that is using by automatic carrier track subsystem 201 according to the signal energy of each carrier wave, after having determined the current carrier wave that is using, can obtain the frequency point information of this carrier wave that is using, and the frequency point information of this carrier wave that is using is sent to CFR subsystem 202, thereby CFR subsystem 202 can set out exactly according to this frequency point information the filter coefficient combination of the required application of CFR, carrying out CFR processes, guarantee the normal use of CFR function, promoted systematic function.
Wherein, after the frequency point information of the carrier wave that has obtained using, the CFR subsystem arranges the process of the filter system combination of the required application of CFR according to the frequency point information of the carrier wave of using, can be to realize with existing mode, for example in front described PC-CFR technology, will not add to give unnecessary details to this process at this.
And wherein determine the carrier wave of using, the process of obtaining the frequency point information of the carrier wave of using different implementation methods to be arranged according to the energy of automatic carrier track subsystem 201 carrier waves, different implementation methods goes for different communication standards:
A kind of implementation wherein, by agreement is carried out dissection process, obtain the SCH channel information of using, then according to the energy of each SCH channel size, the carrier channel that maximum and energy value is defined as using greater than the SCH channel of predetermined threshold value with energy value.This implementation goes for the communication standards such as GSM, DCS, CDMA.Specifically, take the GSM standard as example, by the SCH channel information that gsm protocol is carried out dissection process, obtain using, and obtain the channel energy of each channel, sort according to the size of energy value, preferentially select the large channel of energy; If the energy of two adjacent channels is all larger, stay that large channel of energy, reject that channel of energy less; , directly reject this channel, thereby retain useful channel less than the predetermined threshold value of setting when channel energy; Thereby finally determine the channel that remains, that energy value is greater than the channel of predetermined threshold value and energy value maximum, and with this channel as the carrier channel of using, realize the accurate identification to the carrier channel of using, and learn accordingly the carrier wave that is using.After having determined the carrier wave that is using, just can further determine corresponding carrier frequency point information, this process can adopt existing mode in prior art, does not repeat them here.
As shown in Figure 3, be that in the case, this automatic carrier track subsystem includes at the structural representation with CFR processing unit of automatic carrier track function of the present invention that adopts under this mode:
Energy statistics comparing unit 20112, the energy that is used for add up and compares protocol analysis unit 20111 each SCH channels that obtain of resolving is big or small, determines energy value maximum and energy value greater than the SCH channel of predetermined threshold value;
Carrier wave determining unit 20113 is used for the carrier wave that energy value is maximum and energy value is defined as using greater than carrier wave corresponding to the SCH channel of predetermined threshold value that energy statistics comparing unit 20112 is relatively drawn;
Frequency point information unit 20114 is for the frequency point information of determining the current carrier wave that is using that carrier wave determining unit 20113 is determined.
This implementation preferably is applied to digital radio repeater system, can have application prospect preferably at digital radio repeater system.This be because, in digital radio repeater system, the interference that extraneous wireless signal is subject to is more, signal strength signal intensity is also suddenly big or suddenly small, to having relatively high expectations of automatic carrier track, and by the dissection process to agreement, can have interference free performance preferably, can guarantee to capture exactly corresponding carrier frequency point information.
Shown in Figure 4, be the schematic diagram when the CFR processing unit with automatic carrier track function of the present invention is applied to digital radio repeater system.Because processing, CFR is mainly used in down link, and generally do not need to be applied in up link, therefore, for traditional digital radio repeater system, embedded CFR processing unit with automatic carrier track function of the present invention in its digital intermediate frequency subsystem, in other words the CFR treatment technology with automatic carrier track function of the present invention is embedded in the digital intermediate frequency subsystem, namely can guarantee to trace into exactly the current carrier wave of using, and obtain corresponding carrier frequency point information, guarantee to use accurately the CFR technology.
And another determines the carrier wave of using, the implementation of obtaining the frequency point information of the carrier wave of using according to the energy of carrier wave, to process by the digital signal after the A/D conversion being carried out Digital Down Convert, obtain corresponding baseband signal, add up the signal energy of each baseband signal, the carrier wave that signal energy is defined as using greater than carrier wave corresponding to the baseband signal of default disparity threshold greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave.This implementation is equally applicable to GSM, DCS, cdma communication standard, also goes for WCDMA, CDMA2000, Wimax and TD-SCDMA communication standard simultaneously.specifically, be based on the mode decision scheme of energy statistics, to the digital signal after the A/D conversion, carrying out Digital Down Convert processes, also namely carry out mixing, extract and the filtering processing, obtain corresponding baseband signal, the energy of statistics baseband signal, the size of the energy of two carrier waves that simultaneously also statistics is adjacent with this baseband signal left and right, as long as satisfy simultaneously following three conditions, can judge that this baseband signal is effective carrier wave, be the current carrier wave that is using: the signal energy of current carrier wave is greater than the predetermined threshold value of setting, the signal energy of this carrier wave is larger than the signal energy of two carrier waves in left and right that are adjacent, and the difference of the signal energy of two carrier waves that current carrier wave and left and right are adjacent is greater than default disparity threshold, thereby realize the accurate identification to the carrier wave that is using.After having determined the carrier wave that is using, just can further determine corresponding carrier frequency point information, this process can adopt existing mode in prior art, does not repeat them here.
As shown in Figure 5, be that in the case, this automatic carrier track subsystem includes at the structural representation with CFR processing unit of automatic carrier track function of the present invention that adopts under this mode:
Digital Down Convert unit 20121 is used for that the digital signal after the A/D conversion is carried out Digital Down Convert and processes, and obtains corresponding baseband signal;
Energy statistics comparing unit 20122, be used for baseband signal that statistics and comparative figures down-converter unit 20121 obtain and the energy size of adjacent carrier thereof, determine signal energy greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave carrier wave greater than default disparity threshold;
Carrier wave determining unit 20123 is used for the carrier wave that signal energy that energy statistics comparing unit 20122 is relatively drawn is defined as using greater than the carrier wave of default disparity threshold greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave;
Frequency point information unit 20124 is for the frequency point information of determining the current carrier wave that is using that carrier wave determining unit 20123 is determined.
This implementation, preferably be applicable to digital optical fiber direct station and digital RF far-drawing system, this be because, the downstream signal of the direct-coupling base station, relay of digital optical fiber direct station or digital RF far-drawing system, this signal stabilization and power are larger, are suitable for carrying out the automatic carrier track processing of this mode.
Shown in Figure 6, be, traditional digital optical fiber repeater system or the down link digital processing flow process principle schematic in digital RF far-drawing system that it is to use traditional digital processing mode, does not use the CFR technology in prior art.
Shown in Figure 7, be the down link digital processing theory structure schematic diagram when being applied to the CFR processing unit with automatic carrier track function of the present invention in digital optical fiber repeater system or digital RF far-drawing system.As seen from the figure, adopted the CFR processing unit with automatic carrier track function of the present invention at its down link.It should be noted that, in this example, automatic carrier track subsystem and CFR subsystem to be separated arrange, with automatic carrier track subsystem application in the relay of digital optical fiber direct station or digital RF far-drawing system, be arranged between DDC subsystem and CPRI framing subsystem, and with the capped end of CFR subsystem application in digital optical fiber direct station or digital RF far-drawing system, its input is connected with the output of DUC subsystem.Carrying out the reason that arranges like this, is in order to take full advantage of fiber bandwidth, and this is to consider, essentially, signal after transmission DDC processes will take more bandwidth, and the frequency point information of transmission carrier wave, frequency point information only has a small amount of amount of information, shared bandwidth is also few, therefore, and this processing mode, be reasonable and effective, and can reduce system cost.In this application mode, automatically the carrier track subsystem is followed the tracks of corresponding carrier frequency point, and the carrier frequency point information exchange is crossed the CPRI subsystem be transferred to capped end, capped end is separated frame by CPRI and is processed, recover carrier frequency point information, be transferred to the CFR subsystem, with assurance, the desired filter coefficient combination of CFR be set correctly, thereby guarantee the correct application of CFR function.
The CFR processing unit with automatic carrier track function of the invention described above can utilize special-purpose asic chip to realize, also can utilize the programmable logic devices such as DSP, FPGA, CPLD, EPLD to realize.When using as a whole, when for example being applied to the digital radio repeater system shown in Fig. 4, can realize with an asic chip, when breaking use, when for example being applied to the digital optical fiber direct station shown in Fig. 7 or digital RF far-drawing system, carrier track subsystem and CFR subsystem are realized with an asic chip respectively automatically.
In addition, CFR processing method and the device with automatic carrier track function of the invention described above, specifically can be applicable to the systems such as base station, base station sub-system, radio frequency stretch system and carrier dispatching of the communication standards such as GSM, CDMA, DCS, JDC, TD-SCDMA, WCDMA, CDMA2000, Wimax, do not repeat them here.
In addition, CFR processing unit according to the automatic carrier track function of having of the invention described above, the present invention also provides a kind of communication system, it includes the CFR processing unit of the automatic carrier track function of having of the invention described above, this CFR processing unit application mode in communication system with automatic carrier track function can as mentioned above, not repeat them here.
Above-described embodiment of the present invention is only the detailed description to preferred embodiment of the present invention, does not consist of the restriction to protection range of the present invention.Any modification of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in claim protection range of the present invention.
Claims (8)
1. CFR processing method with automatic carrier track function comprises step:
Determine the carrier wave used according to the energy of carrier wave, obtain the frequency point information of the carrier wave of using;
According to the frequency point information of the described carrier wave of using, the filter coefficient combination of the required application of CFR is set, carry out CFR and process;
Described energy according to carrier wave determines that the mode of the carrier wave used comprises:
Agreement is carried out dissection process, obtain the SCH channel information of using, according to the energy of each SCH channel size, energy value is maximum and carrier wave that energy value is defined as using greater than carrier wave corresponding to the SCH channel of predetermined threshold value
Perhaps
Digital signal after the A/D conversion is carried out Digital Down Convert to be processed, obtain corresponding baseband signal, add up the signal energy of each baseband signal, the carrier wave that signal energy is defined as using greater than carrier wave corresponding to the baseband signal of default disparity threshold greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave.
2. the CFR processing method with automatic carrier track function according to claim 1, it is characterized in that, this CFR method with automatic carrier track function is used for the communication system of GSM, DCS or CDMA standard, perhaps is used for digital radio repeater system.
3. the CFR processing method with automatic carrier track function according to claim 1, it is characterized in that, this CFR method with automatic carrier track function is used for the communication system of GSM, CDMA, WCDMA, CDMA2000, Wimax or TD-SCDMA standard, perhaps is used for digital optical fiber direct station or digital RF far-drawing system.
4. CFR processing unit with automatic carrier track function comprises:
Automatically the carrier track subsystem, be used for the carrier wave used definite according to the energy of carrier wave, obtains the frequency point information of the carrier wave of using, and the frequency point information of this carrier wave of using is exported to the CFR subsystem;
The CFR subsystem is used for the frequency point information according to the described carrier wave of using, and the filter coefficient combination of the required application of CFR is set, and carries out CFR and processes.
5. the CFR processing unit with automatic carrier track function according to claim 4 is characterized in that:
Described automatic carrier track subsystem specifically comprises:
The protocol analysis unit is used for agreement is carried out dissection process, obtains the SCH channel information of using;
The energy statistics comparing unit, being used for statistics and more described protocol analysis unit, to resolve the energy of each SCH channel that obtains big or small, determines energy value maximum and energy value greater than the SCH channel of predetermined threshold value;
The carrier wave determining unit is used for the carrier wave that energy value is maximum and energy value is defined as using greater than carrier wave corresponding to the SCH channel of predetermined threshold value that described energy statistics comparing unit is relatively drawn;
The frequency point information unit is for the frequency point information of determining the current carrier wave that is using that described carrier wave determining unit is determined;
Perhaps
Described automatic carrier track subsystem specifically comprises:
The Digital Down Convert unit is used for that the digital signal after the A/D conversion is carried out Digital Down Convert and processes, and obtains corresponding baseband signal;
The energy statistics comparing unit, be used for baseband signal that statistics and more described Digital Down Convert unit obtain and the energy size of adjacent carrier thereof, determine signal energy greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave carrier wave greater than default disparity threshold;
The carrier wave determining unit is used for the carrier wave that signal energy that described energy statistics comparing unit is relatively drawn is defined as using greater than the carrier wave of default disparity threshold greater than predetermined threshold value, with the difference of the signal energy of adjacent any one carrier wave;
The frequency point information unit is for the frequency point information of determining the current carrier wave that is using that described carrier wave determining unit is determined.
6. according to claim 4 or 5 described CFR processing unit with automatic carrier track function is characterized in that:
This CFR processing unit with automatic carrier track function is realized by asic chip, DSP, FPGA, CPLD or EPLD;
Perhaps
Described automatic carrier track subsystem, described CFR subsystem are realized by asic chip, DSP, FPGA, CPLD or EPLD respectively.
7. the communication system with automatic carrier track function, is characterized in that, comprises the CFR processing unit with automatic carrier track function as described in claim 4 to 6 any one claim.
8. the communication system with automatic carrier track function according to claim 7 is characterized in that:
Described communication system is digital optical fiber repeater system or digital RF far-drawing system, and described automatic carrier track subsystem is connected between DDC subsystem and CPRI framing subsystem, and the input of described CFR subsystem is connected with the output of DUC subsystem;
Perhaps
Described communication system is digital radio repeater system, and described CFR processing unit with automatic carrier track function is arranged at the downstream signal Digital IF Processing subsystem that is connected between downlink radio frequency down-conversion subsystem and downlink radio frequency up-conversion subsystem.
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| CN1998146A (en) * | 2004-04-15 | 2007-07-11 | 高通弗拉里奥恩技术公司 | Methods and apparatus for selecting between multiple carriers based on signal energy measurements |
| CN101431826A (en) * | 2007-11-06 | 2009-05-13 | 京信通信系统（中国）有限公司 | Cell carrier wave tracing method and system for GSM system |
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