CN104618933A - Method for determining clipping threshold and communication device thereof - Google Patents
Method for determining clipping threshold and communication device thereof Download PDFInfo
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- CN104618933A CN104618933A CN201510012555.2A CN201510012555A CN104618933A CN 104618933 A CN104618933 A CN 104618933A CN 201510012555 A CN201510012555 A CN 201510012555A CN 104618933 A CN104618933 A CN 104618933A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2614—Peak power aspects
- H04L27/2623—Reduction thereof by clipping
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L27/26—Systems using multi-frequency codes
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Abstract
Embodiments of the invention disclose a method for determining clipping threshold and a communication device thereof, so as to determining the suitable CFR threshold values based on different parameter configurations, thereby ensuring comprehensive index of PAPR, ACLR and EVM to reach the best performance. The method comprises the following steps: receiving, by the communication device, configuration information dispatched from the a network side, determining a value combination of at least one parameter of the communication device in the existing network condition, wherein the at least one parameter is a preset parameter which affects the peak-to-average ratio of network signals sent by the communication device; then inquiring the LUT based on the value combination, so as to obtain a target threshold value matched with the value combination; and using the target threshold value for clipping the network signals sent by the communication device.
Description
Technical field
The present invention relates to the communications field, particularly relate to a kind of method and the communication equipment of determining slicing thresholding.
Background technology
Long Term Evolution (Long Term Evolution, LTE) owing to adopting OFDM (Orthogonal Freqncy Division Multiplexing, or single-carrier frequency division multiple access (Single-carrier Freqncy-Division Multiple Access OFDM), SC-FDMA) access technology and high-order modulating, therefore there is higher papr (Peak to Average PowerRatio, PAPR).And for power amplifier (Power Amplifier, PA), efficiency and be linearly conflict relation.Especially when PAPR is higher, PA is operated in close to efficiency during zone of saturation higher, but now has serious nonlinear distortion (intermodulation distortion), and in order to keep the linearity, PA needs larger back-off, causes efficiency seriously to reduce.
In order under the prerequisite ensureing the linearity, improve the efficiency of PA, the general clipping algorithm that adopts reduces peak factor, thus reduces the PAPR of signal in base band.But peak factor reduces (Crest FactorReduction, CFR) waveform of signal itself is changed, error vector magnitude (the Error Vector Magnitude of the inband distortion for representing signal can be caused, EVM) with for representing (the Adjacent Channel Leakage Ratio that the band of signal disturbs outward, ACLR) index worsens, and deterioration degree is generally and slicing scale factor (Crest Ratio, CR) be directly proportional, wherein PAPR and CR unit is dB, all complementary Cumulative Distribution Function (the Complementary Cumulative DistributionFunction of respective signal, CCDF) certain Probability Point on curve.Therefore, during CFR application, need to determine suitable CFR thresholding, wherein CFR thresholding threshold value (CR value) represents, for the CFR thresholding of setting, the point that PAPR is greater than this threshold value all by peak clipping, to ensure the equilibrium of the indexs such as PAPR, ACLR and EVM, can reach optimum systematic function.
Typical CFR scheme at present, it is the CFR thresholding that configuration is fixed, but in actual applications, the PAPR of the network signal under various parameter configuration may be different, adopt fixing CFR thresholding, be difficult to reach best slicing effect, cannot ensure that the overall target of PAPR, ACLR and EVM reaches optimum performance.
Summary of the invention
Embodiments provide a kind of method and the communication equipment of determining slicing thresholding, for according to different parameter configuration, determine the CFR thresholding adapted to, to ensure that the overall target of PAPR, ACLR and EVM reaches optimum performance.
Embodiment of the present invention first aspect provides a kind of method determining slicing thresholding, comprising:
Communication equipment receives the configuration information that network side issues, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Described communication equipment is according to described valued combinations, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding;
Described communication equipment adopts described target door limit value to carry out slicing to the network signal that described communication equipment sends.
In conjunction with the first aspect of the embodiment of the present invention, in the first implementation of embodiment of the present invention first aspect, described communication equipment receives the configuration information that network side issues, and determines the valued combinations of at least one parameter under present network conditions in described communication equipment, specifically comprises:
The host system message block MIB that described communication equipment reception network side issues and/or Downlink Control Information DCI;
Described MIB and/or described DCI resolved by described communication equipment, obtains the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions.
In conjunction with the first aspect of the embodiment of the present invention or the first implementation of first aspect, in the second implementation of embodiment of the present invention first aspect, described at least one parameter is: system bandwidth, launch channel type, at least one in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power.
In conjunction with the first aspect of the embodiment of the present invention or the first implementation of first aspect, in the third implementation of embodiment of the present invention first aspect, when described communication equipment uses digital pre-distortion DPD, described at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number.
In conjunction with the first aspect of the embodiment of the present invention to any one implementation in the third implementation of first aspect, in 4th kind of implementation of embodiment of the present invention first aspect, in described LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
In conjunction with the 4th kind of implementation of embodiment of the present invention first aspect, in the 5th kind of implementation of embodiment of the present invention first aspect, described communication equipment adopts described target door limit value to carry out slicing to the network signal that described communication equipment sends to comprise:
Described communication equipment using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent.
Embodiment of the present invention second aspect provides a kind of communication equipment, comprising:
Receiver module, for receiving the configuration information that network side issues;
Determination module, for the configuration information received according to described receiver module, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Enquiry module, for the valued combinations determined according to described determination module, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding,
Slicing module, the target door limit value obtained for adopting described enquiry module carries out slicing to the network signal that described communication equipment sends.
In conjunction with the second aspect of the embodiment of the present invention, in the first implementation of embodiment of the present invention second aspect, described receiver module specifically for, receive the host system message block MIB that issues of network side and/or Downlink Control Information DCI;
Described determination module specifically for, resolve described MIB and/or described DCI, obtain the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions.
In conjunction with the second aspect of the embodiment of the present invention or the first implementation of second aspect, in the second implementation of embodiment of the present invention second aspect, described at least one parameter is: system bandwidth, launch channel type, in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power at least one.
In conjunction with the second aspect of the embodiment of the present invention or the first implementation of second aspect, in the third implementation of embodiment of the present invention second aspect, when described communication equipment uses digital pre-distortion DPD, described at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel type, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number.
In conjunction with the second aspect of the embodiment of the present invention to the third implementation of second aspect, in 4th kind of implementation of embodiment of the present invention second aspect, in described LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
In conjunction with the 4th kind of implementation of embodiment of the present invention second aspect, in 5th kind of implementation of embodiment of the present invention second aspect, described slicing module specifically for, using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent.
As can be seen from the above technical solutions, the embodiment of the present invention has the following advantages: in the embodiment of the present invention, communication equipment receives the configuration information that network side issues, determine the valued combinations of at least one parameter under present network conditions in this communication equipment, this at least one parameter is the default parameter affecting the peak-to-average force ratio of the network signal that this communication equipment sends, then according to this valued combinations, LUT is inquired about, obtain the target door limit value mated with this valued combinations, adopt this target door limit value to carry out slicing to the network signal that communication equipment sends.Because when the valued combinations of the parameter affecting network signal peak-to-average force ratio is determined, the PAPR of network signal determines substantially, like this, according to the valued combinations of at least one parameter under present network conditions, LUT can be searched and obtain target door limit value, this target door limit value and the CFR thresholding of the most applicable present network conditions preset, ensure that the overall target of PAPR, ACLR and EVM can reach optimum performance.
Accompanying drawing explanation
Fig. 1 is the method schematic flow sheet determining slicing thresholding in the embodiment of the present invention;
Fig. 2 is the CCDF curve synoptic diagram of upward signal under different modulating mode in the embodiment of the present invention;
Fig. 3 emulates the simulation result schematic diagram that different predetermined threshold value affects EVM under three kinds of bandwidth when modulation system value is QPSK in the embodiment of the present invention;
Fig. 4 emulates the simulation result schematic diagram that different predetermined threshold value affects EVM under three kinds of bandwidth when modulation system value is 16QAM in the embodiment of the present invention;
Fig. 5 emulates the simulation result schematic diagram that different predetermined threshold value affects EVM under three kinds of bandwidth when modulation system value is 64QAM in the embodiment of the present invention;
Fig. 6 is another schematic flow sheet of method determining slicing thresholding in the embodiment of the present invention;
Fig. 7 is communication equipment structural representation in the embodiment of the present invention;
Fig. 8 is another structural representation of communication equipment in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, in the embodiment of the present invention, determine that method embodiment of slicing thresholding comprises:
101, communication equipment receives the configuration information that network side issues, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
After communication equipment access network, the configuration information that network side issues can be received, according to this configuration information, determine the valued combinations of this at least one parameter under present network conditions in this communication equipment, this at least one parameter is the default parameter affecting the peak-to-average force ratio of the network signal that this communication equipment sends; Be understandable that, this at least one parameter is the parameter that LUT shows to comprise.
It should be noted that, in this at least one parameter, often kind of parameter has at least one value, and under present network conditions, the value of often kind of parameter is all one that determines, therefore, this at least one parameter has a valued combinations determined under present network conditions.
It should be noted that, valued combinations is made up of jointly the value of multiple parameter, such as, if at least one parameter comprises bandwidth sum modulation system, suppose that the value of bandwidth has 5M, 10M two kinds, modulation system can have QPSK and 64QAM two kinds, then according to the different values of parameter, 4 valued combinations can be formed: be respectively 1, bandwidth 5M, modulation system QPSK; 2, bandwidth 5M, modulation system 64QAM; 3, bandwidth 10M, modulation system QPSK; 4, bandwidth 10M, modulation system 64QAM.The valued combinations such as can determining under present network conditions is the 3rd valued combinations: bandwidth 10M, modulation system QPSK wherein.Be understandable that, be only illustrate the one of valued combinations herein, do not limit the kind of parameter or the value of each parameter.
102, described communication equipment is according to described valued combinations, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding;
Communication equipment determines that this at least one parameter is after the valued combinations under present network conditions, according to this valued combinations, inquires about question blank LUT, obtains the target door limit value mated with this valued combinations.This target door limit value is the reference thresholds under the most applicable present network conditions preset.
This LUT comprises the corresponding relation between described at least one parameter and CFR thresholding, wherein, in this at least one parameter, often kind of parameter has at least one value, this at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, this CFR thresholding comprises multiple reference thresholds, the plurality of valued combinations respectively with multiple reference thresholds one_to_one corresponding.
Be understandable that, in actual applications, this LUT table can be stored in this communication equipment, and in some special screnes, communication equipment also can net this LUT of former acquisition from other, is not construed as limiting herein.
It should be noted that, the parameter generating certain network signal is agreement clear stipulaties, therefore, for the valued combinations of various parameter, the CCDF of various valued combinations lower network signal can be counted in advance in laboratory, thus the PAPR (being generally defined as PAPR according to the result at CCDF0.01% probability place) of signal under the valued combinations of various parameter can be determined, then can define a corresponding optimal reference thresholds to the valued combinations of various parameter in advance.
Be understandable that, the PAPR result of the network signal generated under the valued combinations according to the various parameters of the generating network signal counted, can select and wherein larger factor be affected as the parameter in LUT table to PAPR, the such as wherein change of the parameter value parameter that PAPR can be caused to change, also can choose the parameter of some other types according to actual scene or demand, be not construed as limiting herein.
103, described communication equipment adopts described target door limit value to carry out slicing to the network signal that described communication equipment sends.
After communication equipment obtains the target door limit value mated with this valued combinations, adopt this target door limit value to carry out slicing to the network signal that communication equipment sends, all can carry out peak clipping to the point that PAPR in the network signal of this transmission is greater than this target door limit value.
In the embodiment of the present invention, communication equipment receives the configuration information that network side issues, determine the valued combinations of at least one parameter under present network conditions in this communication equipment, this at least one parameter is the default parameter affecting the peak-to-average force ratio of the network signal that this communication equipment sends, then according to this valued combinations, LUT is inquired about, obtain the target door limit value mated with this valued combinations, adopt this target door limit value to carry out slicing to the network signal that communication equipment sends.Because when the valued combinations of the parameter affecting network signal peak-to-average force ratio is determined, the PAPR of network signal determines substantially, like this, according to the valued combinations of at least one parameter under present network conditions, LUT can be searched and obtain target door limit value, this target door limit value and the CFR thresholding of the most applicable present network conditions preset, ensure that the overall target of PAPR, ACLR and EVM can reach optimum performance.
Be understandable that, the PAPR of the valued combinations lower network signal that each parameter is different is different, as shown in Figure 2, for the CCDF curve of LTE 10MHz bandwidth upward signal under different modulating mode, can find out, 0.01% probability place, the PAPR of QPSK modulation system is 6.7dB, the PAPR of 16QAM modulation system is the PAPR of 7.2dB, 64QAM modulation system is 7.6dB.Between different modulating mode, PAPR difference is about 0.5dB, if therefore CFR threshold value is fixedly installed, just cannot ensure that three kinds of modulation systems all reach best slicing effect.Further, according to the valued combinations of each parameter, the Changing Pattern of the PAPR of signal can be counted in advance, optimal reference thresholds under obtaining this Changing Pattern, thus the optimal reference thresholds that the valued combinations obtaining determining is corresponding.
Above in embodiment, this LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding.The generative process of concrete LUT can be:
1, according to the PAPR result of the network signal under the valued combinations of the various parameters of the generating network signal counted, select and wherein larger parameter is affected as the parameter putting into this LUT to PAPR.
At least one parameter then putting into LUT table can be: system bandwidth, transmitting channel type or the type that transmits (PUCCH/PUSCH/SRS), modulation system (QPSK/16QAM/64QAM), resource allocation type (centralized/distributed), Resourse Distribute RB number and transmitting power etc., these affect at least one in larger parameter to PAPR.
2, for each valued combinations of at least one parameter in LUT, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, consider the balanced relation between each index, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
Namely, in LUT table, reference thresholds corresponding to the valued combinations of at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
Be understandable that, the EVM value preset and/or ACLR value are not changeless, can adjust flexibly according to concrete scene or product performance, such as can be set as that EVM is not worse than 3%, ACLR is not worse than 40dBc, certainly, according to actual conditions, other standard more can also be set as, be not construed as limiting herein.
The generative process of this LUT is described below in detail with a concrete example.
Selecting modulation mode and bandwidth are as the parameter in LUT in this example, modulation system has QPSK, 16QAM and 64QAM three kinds of values, bandwidth is had 20M or 15M, 10M and be less than 10M tri-kinds of values, can certainly adopt other division methods, be only one of them example herein;
During emulation, respectively modulation system is fixed as QPSK/16QAM/64QAM, EVM performance during traversal emulation different bandwidth (choosing 5M/10M/20M tri-kinds of bandwidth) and predetermined threshold value (arranging predetermined threshold value value is [4.0,4.2,4.4,4.6,4.8,5.0,5.2,5.4,5.6]), thus 9 curves of EVM can be obtained.Be illustrated in figure 3 the simulation result emulating different predetermined threshold value when modulation system value is QPSK under three kinds of bandwidth and EVM is affected, comprising 1, modulation system value is QPSK, bandwidth value is 5M, 2, modulation system value is QPSK, bandwidth value is 10M and 3, modulation system value is QPSK, bandwidth value is 20M, the simulation result that under these three kinds of valued combinations, different predetermined threshold value affects EVM; Be illustrated in figure 4 the simulation result emulating different predetermined threshold value when modulation system value is 16QAM under three kinds of bandwidth and EVM is affected; Be illustrated in figure 5 the simulation result emulating different predetermined threshold value when modulation system value is 64QAM under three kinds of bandwidth and EVM is affected.
When the ACLR of network signal is not responsive especially to CFR thresholding, can to be only as the criterion the reference thresholds arranged under different bandwidth/modulation system with the EVM value preset, because the certain satisfied ACLR value preset now, when ACLR is responsive to CFR thresholding, can using default EVM value with default ACLR value all as the standard arranging reference thresholds.
Such as, if following table 1 is according to simulation result, using EVM be the predetermined threshold value of 3% correspondence as the reference thresholds in LUT:
Table 1
9 kinds of valued combinations and 9 reference thresholds relation one to one of bandwidth and these two parameters of modulation system is included in LUT shown in table 1.
Above in embodiment, at least one parameter in LUT can be: system bandwidth, launch channel type, transmit type, modulation system, resource allocation type, at least one in Resourse Distribute RB number or transmitting power, in actual applications, when communication equipment uses DPD, during owing to being operated in strong nonlinearity state as PA (such as maximum transmission power), it is higher to the susceptibility of signal PAPR, if PAPR can be reduced 0.1dB by CFR, the ACLR of PA output signal just has the lifting of 2 ~ 3dB, and PA is so not high to the susceptibility of PAPR when middle low-power point, therefore can under the operating state of PA strong nonlinearity (near maximum transmission power point), CFR thresholding is arranged lower, namely can using transmitting power also as a kind of parameter in LUT.
As shown in table 2 below, during for DPD and CFR co-operation, under different transmission power PAOut, CFR thresholding is not set, and arrange two kinds of different CFR thresholdings EVM and the ACLR result of testing to obtain, modulation system value is 16QAM, and bandwidth respectively value is 20M, 10M and 5M:
Table 2
As can be seen from upper table 2, during PAOut=24dBm, CFR thresholding is set to 4.4dB and 4.6dB ACLR performance difference very little, and threshold ones causes EVM to worsen.And during 26dBm, after CFR thresholding is set to 4.4dB ACLR performance comparatively CFR thresholding be set to 4.6dB promote 2 ~ 3dB.Although now EVM has the deterioration of about 0.5%, still lower than 3% preset value, and under high power, the requirement of system to the PA linearity is higher.
Based on the test result of upper table 2, the reference thresholds in 20M bandwidth peak power interval is set to 4.4dB by us, the reference thresholds of other power interval is set to 4.8dB, the reference thresholds of 10M bandwidth is set to 4.3dB and 4.7dB respectively, and the reference thresholds of 5M bandwidth is set to 4.5dB and 4.9dB respectively.In addition, described by a upper example, modulation system affects very large on signal PAPR, therefore we add this parameter of modulation system when generating LUT, obtain following LUT:
Table 3
Relation is one to one included between 18 kinds of valued combinations of these three parameters of system bandwidth, modulation system and transmitting power and 18 CFR threshold values in LUT then shown in table 3.
Be understandable that, according to actual conditions, can also include the corresponding relation between more parameter and CFR thresholding in LUT, above two are only example, conveniently understand the generative process of LUT, be not construed as limiting herein.
Below to determining in the embodiment of the present invention that the method for slicing thresholding is specifically described, referring to Fig. 6, in the embodiment of the present invention, determining that another embodiment of method of slicing thresholding comprises:
601, communication equipment receives the host system message block MIB that issues of network side and/or Downlink Control Information DCI;
After communication equipment access network, can receive MIB and DCI that network side issues, this MIB is carried in Physical Broadcast Channel PBCH, and this DCI is carried in physical downlink control channel PDCCH.
602, described MIB and/or described DCI resolved by described communication equipment, obtain the value of often kind of parameter under present network conditions at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
This MIB and/or described DCI resolved by communication equipment, obtains the value of often kind of parameter under present network conditions at least one parameter, to obtain the valued combinations of this at least one parameter under present network conditions.
Concrete, the MIB that communication equipment can carry in demodulation PBCH, obtain the value of system bandwidth, specifically can with reference to 3GPP 36.331 agreement, can uplink scheduling is relevant in demodulation PDCCH DCI, obtain the schedule information of sub-frame of uplink, for DCI0, modulation system, resource allocation type, Resourse Distribute RB number and power can be obtained and control the isoparametric value of TPC command, specifically can with reference to 3GPP 36.212 agreement.It is relevant to uplink transmission power that this power controls TPC command, controls according to this power the value that TPC command can calculate uplink transmission power.The value of other parameter can also be obtained, be not construed as limiting herein.
It should be noted that, in this at least one parameter, often kind of parameter has at least one value, and under present network conditions, the value of often kind of parameter is all one that determines, therefore, this at least one parameter has a valued combinations determined under present network conditions.
It should be noted that, valued combinations is made up of jointly the value of multiple parameter, such as, if at least one parameter comprises bandwidth sum modulation system, suppose that the value of bandwidth has 5M, 10M two kinds, modulation system can have QPSK and 64QAM two kinds, then according to the different values of parameter, 4 valued combinations can be formed: be respectively 1, bandwidth 5M, modulation system QPSK; 2, bandwidth 5M, modulation system 64QAM; 3, bandwidth 10M, modulation system QPSK; 4, bandwidth 10M, modulation system 64QAM.The valued combinations such as can determining under present network conditions is the 3rd valued combinations: bandwidth 10M, modulation system QPSK wherein.Be understandable that, be only illustrate the one of valued combinations herein, do not limit the kind of parameter or the value of each parameter.
Optionally, described at least one parameter is: system bandwidth, launch channel type, at least one in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power.
Optionally, when described communication equipment uses digital pre-distortion DPD, described at least one parameter comprises transmitting power, or, comprising: at least one and described transmitting power in system bandwidth, transmitting channel or signal type, modulation system, resource allocation type, Resourse Distribute RB number.
Be understandable that, this communication equipment can be terminal, also can be base station, when this communication equipment is terminal, these parameters are the parameter of uplink network signal, and such as transmitting power is wherein uplink transmission power, and modulation system is wherein the modulation system etc. of uplink network signal; When this communication equipment is base station, these parameters are the parameter of downlink network signal, and such as transmitting power is wherein down transmitting power, and modulation system is wherein the modulation system etc. of downlink network signal, is not construed as limiting herein.
Such as, communication equipment is by resolving MIB and DCI, and the valued combinations determined in current LTE network under present network conditions is: system bandwidth value is 10M, and modulation system value is 64QAM, and uplink transmission power value is 20dBm.
603, described communication equipment is according to described valued combinations, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding;
Communication equipment determines that this at least one parameter is after the valued combinations under present network conditions, according to this valued combinations, inquires about question blank LUT, obtains the target door limit value mated with this valued combinations.This target door limit value is the reference thresholds under the most applicable present network conditions preset.
This LUT comprises the corresponding relation between described at least one parameter and CFR thresholding, wherein, in this at least one parameter, often kind of parameter has at least one value, this at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, this CFR thresholding comprises multiple reference thresholds, the plurality of valued combinations respectively with multiple reference thresholds one_to_one corresponding.
Be understandable that, in actual applications, this LUT table can be stored in this communication equipment, and in some special screnes, communication equipment also can net this LUT of former acquisition from other, is not construed as limiting herein.
It should be noted that, the parameter generating certain network signal is agreement clear stipulaties, therefore, for the valued combinations of various parameter, the CCDF of various valued combinations lower network signal can be counted in advance in laboratory, thus the PAPR (being generally defined as PAPR according to the result at CCDF0.01% probability place) of signal under the valued combinations of various parameter can be determined, then can define a corresponding optimal reference thresholds to the valued combinations of various parameter in advance.
Be understandable that, the PAPR result of the network signal generated under the valued combinations according to the various parameters of the generating network signal counted, can select and wherein larger factor be affected as the parameter in LUT table to PAPR, the such as wherein change of the parameter value parameter that PAPR can be caused to change, also can choose the parameter of some other types according to actual scene or demand, be not construed as limiting herein.
In described LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
Such as, communication equipment is according to the valued combinations under the present network conditions determined, the LUT shown in look-up table 3, the target door limit value obtaining valued combinations under present network conditions corresponding is 4.9.
605, described communication equipment using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent.
After communication equipment obtains the target door limit value mated with this valued combinations, using this target door limit value as CFR threshold value when carrying out power amplification to the network signal sent, adopt this target door limit value to carry out slicing to the network signal that communication equipment sends, all can carry out peak clipping to the point that PAPR in the network signal sent is greater than this target door limit value.
Such as, communication equipment obtains target door limit value after to be 4.9 be, using this target door limit value 4.9 as CFR threshold value when carrying out power amplification to the network signal sent, the network signal adopting 4.9 pairs of communication equipments to send carries out slicing, and some PAPR in the network signal of communication equipment transmission being greater than to 4.9 all carries out peak clipping.
In the embodiment of the present invention, communication equipment, according to MIB and DCI, determines the valued combinations under present network conditions, make the valued combinations determined more accurate, thus find more accurate CFR threshold value, improve slicing effect, improve the performance of the overall target of PAPR, ACLR and EVM.
Be understandable that, except in the LTE network described in above-described embodiment, at other networks, such as WCDMA, or in the communication network such as GSM, as long as employ clipping algorithm, the method of the determination slicing thresholding described in the embodiment of the present invention can be used, be not construed as limiting herein.
Be described the communication equipment in the embodiment of the present invention below, please participate in Fig. 7, in the embodiment of the present invention, communication equipment embodiment comprises:
Receiver module 701, for receiving the configuration information that network side issues;
Determination module 702, for the configuration information received according to described receiver module 701, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Enquiry module 703, for the valued combinations determined according to described determination module 702, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding,
Slicing module 704, the target door limit value obtained for adopting described enquiry module 703 carries out slicing to the network signal that described communication equipment sends.
In the embodiment of the present invention, receiver module 701 receives the configuration information that network side issues, determination module 702 determines the valued combinations of at least one parameter under present network conditions in this communication equipment, this at least one parameter is the default parameter affecting the peak-to-average force ratio of the network signal that this communication equipment sends, enquiry module 703 is according to this valued combinations, LUT is inquired about, obtain the target door limit value mated with this valued combinations, slicing module 704 adopts this target door limit value to carry out slicing to the network signal that communication equipment sends.Because when the valued combinations of the parameter affecting network signal peak-to-average force ratio is determined, the PAPR of network signal determines substantially, like this, according to the valued combinations of at least one parameter under present network conditions, LUT can be searched and obtain target door limit value, this target door limit value and the CFR thresholding of the most applicable present network conditions preset, ensure that the overall target of PAPR, ACLR and EVM can reach optimum performance.
Be specifically described communication equipment in the embodiment of the present invention below, refer to Fig. 7, in the embodiment of the present invention, another embodiment of communication equipment comprises:
Receiver module 701, for receiving the configuration information that network side issues;
Determination module 702, for the configuration information received according to described receiver module 701, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Enquiry module 703, for the valued combinations determined according to described determination module 702, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding,
Slicing module 704, the target door limit value obtained for adopting described enquiry module 703 carries out slicing to the network signal that described communication equipment sends;
Above-mentioned determination module 702 specifically for, resolve described MIB and/or described DCI, obtain the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions;
Optionally, above-mentioned at least one parameter is: system bandwidth, launch channel type, in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power at least one;
Optionally, when communication equipment uses digital pre-distortion DPD, above-mentioned at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel type, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number;
Concrete, in above-mentioned LUT, reference thresholds corresponding to the valued combinations of at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations,
Optionally, above-mentioned slicing module 704 specifically for, using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent;
Optionally, above-mentioned network signal can be LTE network signal;
In the present embodiment, determination module 702, according to MIB and/or DCI, determines the valued combinations under present network conditions, make the valued combinations determined more accurate, thus find more accurate CFR threshold value, improve slicing effect, improve the performance of the overall target of PAPR, ACLR and EVM.
Refer to Fig. 8, in the embodiment of the present invention, another embodiment of communication equipment comprises:
DSP control module 801, memory module 802, digital baseband processor 803, digital to analog converter DAC804 and radio-frequency module 805;
Wherein, this memory module 802, for storing LUT, described LUT comprises at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends,
This memory module 802 can read for DSP control module 801;
This radio-frequency module 805, for receiving the configuration information that network side issues, and sends network signal;
This digital to analog converter DAC804 is used for the analog signal that radio-frequency module 805 receives to be converted to the digital signal that digital baseband processor 803 can identify, and the digital signal that digital baseband processor 803 sends is converted to the analog signal that radio-frequency module 805 can send;
Digital baseband processor 803, for the configuration information that demodulation radio-frequency module 805 receives, determine the valued combinations of described at least one parameter under present network conditions in described communication equipment;
DSP control module 801, for the valued combinations of at least one parameter under present network conditions determined according to this digital baseband processor 803, inquires about the LUT in memory module 802, obtains the target door limit value mated with this valued combinations;
Digital baseband processor 803, the target door limit value also for obtaining according to DSP control module 801, the network signal up to this communication equipment carries out slicing.
Optionally, this radio-frequency module 805, the host system message block MIB issued specifically for reception network side and/or Downlink Control Information DCI;
This digital baseband processor 803, the MIB received specifically for demodulation radio-frequency module 805 and/or described DCI, obtain the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions;
Optionally, above-mentioned at least one parameter is: system bandwidth, launch channel type, at least one in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power;
Optionally, when this communication equipment uses digital pre-distortion DPD, above-mentioned at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel type, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number;
Concrete, in LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
Those skilled in the art can be well understood to, and for convenience and simplicity of description, the system of foregoing description, the specific works process of device and unit, with reference to the corresponding process in preceding method embodiment, can not repeat them here.
In several embodiments that the application provides, should be understood that, disclosed system, apparatus and method, can realize by another way.Such as, device embodiment described above is only schematic, such as, the division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical, machinery or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in each embodiment of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprising some instructions in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) perform all or part of step of method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, portable hard drive, read-only memory (ROM, Read-OnlyMemory), random access memory (RAM, Random Access Memory), magnetic disc or CD etc. various can be program code stored medium.
The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (12)
1. determine a method for slicing thresholding, it is characterized in that, comprising:
Communication equipment receives the configuration information that network side issues, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Described communication equipment is according to described valued combinations, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding;
Described communication equipment adopts described target door limit value to carry out slicing to the network signal that described communication equipment sends.
2. method according to claim 1, is characterized in that, described communication equipment receives the configuration information that network side issues, and determines the valued combinations of at least one parameter under present network conditions in described communication equipment, specifically comprises:
The host system message block MIB that described communication equipment reception network side issues and/or Downlink Control Information DCI;
Described MIB and/or described DCI resolved by described communication equipment, obtains the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions.
3. method according to claim 1 and 2, is characterized in that, described at least one parameter is: system bandwidth, launch channel type, at least one in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power.
4. method according to claim 1 and 2, it is characterized in that, when described communication equipment uses digital pre-distortion DPD, described at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number.
5. method according to any one of claim 1 to 4, it is characterized in that, in described LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
6. method according to claim 5, is characterized in that, described communication equipment adopts described target door limit value to carry out slicing to the network signal that described communication equipment sends to comprise:
Described communication equipment using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent.
7. a communication equipment, is characterized in that, comprising:
Receiver module, for receiving the configuration information that network side issues;
Determination module, for the configuration information received according to described receiver module, determine the valued combinations of at least one parameter under present network conditions in described communication equipment, described at least one parameter is the parameter of the peak-to-average force ratio of the network signal that the default described communication equipment of impact sends;
Enquiry module, for the valued combinations determined according to described determination module, question blank LUT is inquired about, obtain the target door limit value mated with described valued combinations, described LUT comprises described at least one parameter and peak factor and reduces corresponding relation between CFR thresholding, wherein, in described at least one parameter, often kind of parameter has at least one value, described at least one parameter is according to the value of often kind of parameter, form multiple valued combinations, described CFR thresholding comprises multiple reference thresholds, described multiple valued combinations respectively with described multiple reference thresholds one_to_one corresponding,
Slicing module, the target door limit value obtained for adopting described enquiry module carries out slicing to the network signal that described communication equipment sends.
8. communication equipment according to claim 7, is characterized in that, described receiver module specifically for, receive the host system message block MIB that issues of network side and/or Downlink Control Information DCI;
Described determination module specifically for, resolve described MIB and/or described DCI, obtain the value of often kind of parameter under present network conditions in described at least one parameter, to obtain the valued combinations of described at least one parameter under present network conditions.
9. the communication equipment according to claim 7 or 8, it is characterized in that, described at least one parameter is: system bandwidth, launch channel type, in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number or transmitting power at least one.
10. the communication equipment according to claim 7 or 8, it is characterized in that, when described communication equipment uses digital pre-distortion DPD, described at least one parameter comprises transmitting power, or, comprising: system bandwidth, launch channel type, at least one and described transmitting power in the type that transmits, modulation system, resource allocation type, Resourse Distribute RB number.
11. communication equipments according to any one of claim 7 to 10, it is characterized in that, in described LUT table, the reference thresholds corresponding to valued combinations of described at least one parameter is: for arbitrary valued combinations of described at least one parameter, undertaken emulating or testing by traveling through different predetermined threshold value, under the corresponding relation of predetermined threshold value different under obtaining described arbitrary valued combinations and different error vector magnitude EVM value and/or described arbitrary valued combinations different predetermined threshold value and different Adjacent Channel Leakage Ratio ACLR corresponding relation after, choose the corresponding predetermined threshold value with the EVM value preset and/or ACLR value, as the reference thresholds corresponding to described arbitrary valued combinations.
12. communication equipments according to claim 11, is characterized in that, described slicing module specifically for, using described target door limit value as CFR threshold value when carrying out power amplification to the network signal sent.
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