WO2014067301A1 - Procédé et appareil d'écrêtage de signaux multibandes - Google Patents

Procédé et appareil d'écrêtage de signaux multibandes Download PDF

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Publication number
WO2014067301A1
WO2014067301A1 PCT/CN2013/080540 CN2013080540W WO2014067301A1 WO 2014067301 A1 WO2014067301 A1 WO 2014067301A1 CN 2013080540 W CN2013080540 W CN 2013080540W WO 2014067301 A1 WO2014067301 A1 WO 2014067301A1
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Prior art keywords
peak
signal
value
peak clipping
clipping
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PCT/CN2013/080540
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English (en)
Chinese (zh)
Inventor
熊军
段滔
孙华荣
肖鹏
王策
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大唐移动通信设备有限公司
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Publication of WO2014067301A1 publication Critical patent/WO2014067301A1/fr

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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

Definitions

  • TD-SCDMA Time Division-Synchronous Code Division Multiple Access
  • F Frequency Division Multiple Access
  • A 2010MHz-2025MHz
  • D 2570MHz-2620MHz
  • the prior art has two solutions for the processing of multi-band multi-carrier signals.
  • Solution 1 For example, the A+F scheme has a design example of combining analog signals. In this design, the A and F path signals are completely separated in the digital domain, merged before the power amplifier, and then split after the power amplifier for feedback.
  • Feedback DPD Digital Pre-Distortion, digital pre-distortion method for splitting the local oscillator.
  • the advantage of this scheme is that it does not require any modifications to the existing algorithm and the performance is stable.
  • the disadvantages are that the device is bulky, inefficient, and costly.
  • the indoor and outdoor frequency band combination schemes are very complicated.
  • the 3G system is significantly different.
  • the combination of too many frequency bands has resulted in a large number of RRU (Radio Remote Unit) devices in the existing network.
  • RRU Radio Remote Unit
  • Solution 2 The F+A signal is combined to perform CFR and DPD processing.
  • the combined signal passes through the same MCPA (Multi Carrier Power Amplifier), and the F+A band combined signal frequency band spans over 120Mhz, in order to complete CFR and DPD.
  • the algorithm usually uses a higher IF processing rate, and is of course limited by the current clock processing capability of an FPGA (Field Programmable Gate Array).
  • FPGA Field Programmable Gate Array
  • the F-band covers the band of 1880-1915MHZ
  • Figure 1 shows the distribution of the F and A bands and the distribution of the third and fifth order intermodulation signals.
  • This wideband peak clipping (CFR) will be one of the bottleneck techniques that prevent wideband RRUs from implementing A/F common RF channels.
  • the method for predicting the peak value of the multi-carrier signal combining process mainly includes a phase selection method and an absolute value summation method: the phase selection method is relatively simple, and the device block diagram is as shown in FIG. 3, and the formula is expressed.
  • Embodiments of the present application provide a method and a device for peak clipping of a multi-band signal, which are used for performing peak estimation and post-cutting processing before a single-channel broadband power amplifier for a multi-band signal, thereby effectively avoiding over-cutting and missing, and reducing EVM, and can be applied to various frequency bands.
  • the maximum peak value of the region where the sample point corresponding to the signal value is determined is determined
  • the signals of the respective frequency bands are respectively subtracted from the corresponding peak clipping sequences to obtain a multi-band signal after peak clipping.
  • a peak prediction module configured to predict, by filtering, an output signal after multi-band signal combining processing
  • a threshold detecting module configured to sequentially determine whether a signal value of the predicted output signal is higher than a peak clipping threshold
  • a peak determining module configured to determine, when determining that a signal value higher than a peak clipping threshold exists, determine a corresponding value of the signal value The maximum peak of the area where the point is located
  • An amplitude determining module configured to determine, according to the maximum peak, a corresponding signal of each frequency band in the multi-band signal Peak amplitude phase parameter
  • a peak clipping sequence generating module configured to generate a peak clipping sequence corresponding to the signal of each frequency band by the peak clipping amplitude phase parameter and the fixed length prototype peak clipping sequence;
  • the peak shaving module is configured to subtract the corresponding peak clipping sequence from the signals of the respective frequency bands to obtain a multi-band signal after peak clipping.
  • a radio remote unit (RRU) provided by the embodiment of the present application includes:
  • a peak prediction module configured to predict, by filtering, an output signal after multi-band signal combining processing
  • a threshold detecting module configured to sequentially determine whether a signal value of the predicted output signal is higher than a peak clipping threshold
  • a peak determining module configured to determine, when determining that a signal value higher than a peak clipping threshold exists, determine a corresponding value of the signal value The maximum peak of the area where the point is located
  • An amplitude determining module configured to determine, according to the maximum peak, a peak amplitude and phase parameter corresponding to a signal of each frequency band in the multi-band signal;
  • a peak clipping sequence generating module configured to generate a peak clipping sequence corresponding to the signal of each frequency band by the peak clipping amplitude phase parameter and the fixed length prototype peak clipping sequence;
  • the peak shaving module is configured to subtract the corresponding peak clipping sequence from the signals of the respective frequency bands to obtain a multi-band signal after peak clipping.
  • a processor configured to predict an output signal after multi-band signal combining processing by filtering; sequentially determining whether a signal value of the predicted output signal is higher than a peak clipping threshold; and determining that a signal value higher than a peak clipping threshold is determined Determining a maximum peak value of a region where the sample point corresponding to the signal value is located; determining, according to the maximum peak value, a peak clipping amplitude phase parameter corresponding to a signal of each frequency band in the multi-band signal; The prototype peak clipping sequence of length generates peak clipping sequences corresponding to the signals of the respective frequency bands respectively; the signals of the respective frequency bands are respectively subtracted from the corresponding peak clipping sequences to obtain multi-band signals after peak clipping.
  • FIG. 1 is a frequency band distribution diagram of F and A frequency bands and third-order and fifth-order intermodulation signals in the prior art
  • 2 is a schematic diagram of an effect of performing CFR on a multi-band signal after superposition in the prior art
  • 3 is a block diagram of a device of a phase selection method in the prior art
  • FIG. 5 is a schematic flowchart of a method for peak clipping of a multi-band signal according to an embodiment of the present disclosure
  • FIG. 6 is a block diagram of an interface of a multi-band signal peak clipping device according to an embodiment of the present application.
  • FIG. 7 is a detailed block diagram of an apparatus for peak clipping of a multi-band signal according to an embodiment of the present application.
  • FIG. 8 is a schematic flowchart of a method for peak clipping of a multi-band signal according to an embodiment of the present disclosure
  • FIG. 9 is a block diagram of a device for filtering according to an embodiment of the present application.
  • FIG. 10 is a diagram showing a peak clipping effect of a peak detecting method according to an embodiment of the present application.
  • FIG. 11 is a diagram showing a peak clipping effect of another peak detecting method according to an embodiment of the present application.
  • FIG. 12 is a schematic diagram of a scenario of a peak detection method according to an embodiment of the present application.
  • FIG. 13 is another schematic diagram of a scenario of a peak detection method according to an embodiment of the present application.
  • FIG. 14 is a diagram showing a detection result of a peak detecting method according to an embodiment of the present application.
  • 15 is another detection effect diagram of a peak detecting method according to an embodiment of the present application.
  • 16 is a block diagram of a device for verifying peak clipping effect of a multi-band signal according to an embodiment of the present application
  • 17 is a comparison diagram of CCDF curves of an absolute value summation method provided by an embodiment of the present application.
  • FIG. 19 is a comparison diagram of a CCDF curve of a filtering method according to an embodiment of the present application.
  • 21 is an EVM rendering diagram of an absolute value summation method provided by an embodiment of the present application.
  • FIG. 22 is an EVM rendering diagram of a filtering method according to an embodiment of the present application.
  • FIG. 23 is a structural diagram of a device for peak clipping of a multi-band signal according to an embodiment of the present application.
  • FIG. 24 is a structural diagram of another apparatus for peak clipping of a multi-band signal according to an embodiment of the present application.
  • DETAILED DESCRIPTION OF THE EMBODIMENTS Embodiments of the present application provide a method and a device for peak clipping of a multi-band signal, which are used for performing peak estimation and post-cutting processing of a single-channel broadband power amplifier on a multi-band signal by a filtering method, thereby effectively avoiding over-cutting and Leakage, lower EVM, and no requirement for the frequency band of the signal, improving application flexibility.
  • a method for peak clipping of a multi-band signal includes:
  • S102 sequentially determining whether the signal value of the predicted output signal is higher than a peak clipping threshold
  • S101 includes: performing interpolation filtering on signals in each frequency band of the multi-band signal; performing spectrum shifting on signals of each frequency band after interpolation filtering; and combining signals of respective frequency bands after spectrum shifting; The combined signal is extracted to obtain a predicted output signal.
  • the frequency shift is to move the signals of each frequency band to the same intermediate frequency.
  • the above method is called the filtering method. The method uses the same half-band filter and the same frequency shifting function as the signal is actually combined to process the input DAC. Therefore, the predicted output signal has high accuracy and versatility. It can meet the application of various scenarios with multi-band distribution. And since half of the HB filter is zero and the filter coefficients are symmetrical, the added resources are limited.
  • the peak clipping threshold in S 102 is a preset value determined by the parameters of the device such as the power amplifier.
  • S 103 is specifically configured to determine, according to the sample point, a signal value corresponding to each sample point within a predetermined sampling interval; determining the signal value The maximum value is the maximum peak value.
  • the solution A may be obtained: determining the signal value corresponding to the sampling point one by one for the sampling point after the sampling interval; when determining that the signal value is greater than the At the maximum peak value, the signal value is determined as the maximum peak value; when it is determined that the signal value is less than the maximum peak value, the determination is ended; or, scheme B: determining the sample points one by one after the sample interval The corresponding signal value of the point; when it is determined that the signal value is greater than the maximum peak value, the signal value is determined as the maximum peak value; when it is determined that the signal value is less than the peak clipping threshold value, the determination is ended.
  • the area refers to a dynamic area that is not less than a preset sampling interval for performing
  • the signal value corresponding to each sample point refers to the signal value of the output signal after the combination processing corresponding to each sample point.
  • S104 specifically: determining, by the signal value of each frequency band corresponding to the maximum peak value and the maximum peak value, determining a peak clipping ratio corresponding to the signal of each frequency band; The maximum peak value, the peak clipping threshold, and the peak clipping ratio determine the peak amplitude and phase parameters corresponding to the signals of the respective frequency bands.
  • the peak clipping ratio is positively correlated with the maximum peak value, and is positively correlated with the signal value of the input signal of each frequency band corresponding to the maximum peak value; the peak clipping amplitude phase parameter is used to determine the amplitude and phase of the peak clipping pulse, and the peak clipping ratio is positive Correlation, positively correlated with the difference between the maximum peak and the peak clipping threshold.
  • the peak clipping phase sequence and the fixed length prototype peak clipping sequence respectively generate peak clipping pulses corresponding to signals of respective frequency bands; Corresponding all peak clipping pulses are determined as the peak clipping sequence corresponding to the signal of the frequency band.
  • the prototype peak clipping sequence is a pre-stored fixed length sequence dedicated to peak clipping, and the peak clipping sequence is adjusted according to the peak clipping amplitude parameter obtained in S 104 to obtain the required peak clipping pulse. Since the peak clipping is actually for a finite length that contains a peak larger than the peak clipping threshold In the sample interval, there are multiple such sample intervals after the multi-band signals are combined. Therefore, there are usually multiple peak clipping pulses, and the peak clipping sequence needs to be output according to all the peak clipping pulses, so that S 106 can be used for peak clipping.
  • MCPA Multi Carrier Power Amplifier
  • the RRU with wideband MCPA technology combines different frequency bands and completely shares the system resources such as RF output power and carrier in different frequency bands. It can be flexibly configured according to the needs of operators and user development, and maximize resource utilization, which is conducive to improvement. RRU's maturity and reliability, as well as increased network shield. This technology can be applied to TD-SCDMA/LTE/LTE-A (Long Term Evolution Advanced).
  • FIG. 6 a device and interface block diagram for multi-band signal peak clipping provided by the present application.
  • the multi-band OFDM (Orthogonal Frequency Division Multiplexing) modulated signal is interpolated and filtered and input to the multi-band peak clipping module as follows:
  • d represents baseband data, including IFFT (Inverse Fast Fourier Transform) processing of the signal, and transforms the data symbol into a sample point by IFFT;
  • IFFT Inverse Fast Fourier Transform
  • the OFDM modulated signal is subjected to first-stage interpolation filtering to complete spectrum shaping and first frequency shifting of the OFDM signal.
  • first-stage interpolation filtering After entering the multi-band peak clipping device of the present application, after completing the peak clipping processing of the multi-band signal, the second interpolation filtering and the frequency shift processing are started, and the CFR effect can be observed at this time.
  • the carrier of the multi-band signal After the carrier of the multi-band signal is superimposed, it enters the DAC (Digital to Analog Converter) processing module, and the DAC internally performs further interpolation filtering, but at this time, PAR (Peak to Average Ratio) Growth is very effective, generally less than 0.3dBc.
  • DAC Digital to Analog Converter
  • z(n) y ⁇ n). * exp(- —f ⁇ * n) + y2(n). * exp(j -—/2 * n)
  • i ss The representation function is directly multiplied, which is different from vector multiplication; yl(n) and y2(n) are the output of xl(n) and x2(n) respectively after the peak clipping device of the present application, and z(n) is before the input DAC Combine signals.
  • the prior art absolute value summation method and phase selection method there are requirements for the frequency of fl and £2, and need to be satisfied.
  • the signals after multi-band superposition are as follows:
  • FIG. 7 is a detailed block diagram of a multi-band signal peak clipping device according to an embodiment of the present application; corresponding to FIG. 7 , a method for multi-band signal peak clipping according to an embodiment of the present application is shown in FIG. 8 . Shown as follows:
  • the filtering method is designed for multi-carrier prediction.
  • the block diagram of the filtering prediction device is shown in Fig. 9.
  • the frequency band 1 and frequency band 2 signals are first interpolated and filtered, and the input signal rate is doubled;
  • conv is a convolution function
  • HB is a half-band filter function
  • xl (") are input signals of different frequency bands
  • 2 is a spectrum shift amount corresponding to signals of different frequency bands, and is a signal obtained by combining multiple signals
  • ⁇ (" is the signal obtained after signal extraction.
  • the peak clipping threshold (peak clipping threshold) of the set signal is THD (TresHolD), and THD is related to the parameters of the power amplifier. If the peak clipping operation is performed by detecting a peak point, since the peak value of the signal across the frequency band is generally sharp and densely distributed, as shown in Fig. 10, there is a case where the peak is overcut.
  • This application proposes to use two consecutive windows to find the peak point.
  • the first window (WIN1): ⁇ Use a sample interval Delay_tap to find the maximum peak point for peak clipping, which can effectively remove the maximum peak signal, as shown in Figure 11;
  • PX _ max( « + k) max (PX ⁇ ri), PX ⁇ n + 1), ...PX ⁇ n + Delay _ tap
  • Peak _ posi (n + k)
  • the subsequent signal still has a larger peak omission.
  • the subsequent signal still has a larger peak omission.
  • the present application proposes a second window (WIN2) based on the first step peak detecting device described above to find the larger peak point.
  • the second window is designed in two ways:
  • MAX _ PEAK PX(n + Delay _ tap + 1)
  • Peak _ posi (n + Delay _ tap + 1)
  • Peak _ posi peak _ posil
  • the maximum peak point can be effectively detected by two peak detections, that is, the maximum peak power point is not missed, and the occurrence of overcutting is not reduced, thereby reducing the loss of EVM.
  • the predicted peak amplitude points of two 20MHz multi-band signals are simulated, as shown in Figure 14 and Figure 15.
  • Figure 14 is the effect diagram of the first peak detection
  • Figure 15 is the effect diagram of the second peak detection.
  • the 40th sample point in Fig. 13 is effectively detected, and the peak detection of the prediction signal is completed. It can be seen that the design of the second window improves the peak detection effect. S203, the peak clipping ratio is graded;
  • the peak clipping ratios of different frequency bands are different. Proportional cutting of the peak points of the respective frequency bands minimizes the deterioration of the system EVM, and the peak clipping ratio of each frequency band is determined as follows.
  • each peak detected is assigned a peak clipping generation module (CPG), which is marked as "occupied state”, and each CPG module can only process one peak point at a time. (Peak-to-cut), once the peak point is trimmed, the CPG is marked as "idle state”. Once in the "idle state", a new peak point occurs and the Peak Allocator module allocates an idle CPG module. To handle this peak point.
  • CPG peak clipping generation module
  • the Peak Cut Pulse Generation Module mainly stores a fixed length prototype peak clipping sequence. If a CPG is called by the Peak Allocator module, the product of the corresponding peak point amplitude phase and the prototype peak clipping sequence will be completed. If all CPG modules are being used, no peak clipping will be performed at this level for the peak points detected next.
  • pulse summation SUM module which adds the outputs of all CPG modules to form a peak clipping sequence.
  • the peak clipping sequence formed by the SUM module is subtracted to obtain the final output of the CFR module.
  • the signal after peak clipping is represented by -K") ⁇ 2 - 1 ⁇ 7 ), and the peak clipping sequence is represented by s2 - noise(n).
  • the IF signal does not pass through the peak clipping module, and directly enters the filtering of the subsequent stage and the multi-band carrier superposition processing.
  • the IF signal passes through the peak clipping module, and then enters the filtering and multi-band carrier superposition processing of the subsequent stage.
  • the design of each parameter is shown in Figure 16.
  • the signal rate of Band 1 is 30.72MHz. After the first filtering speed is 122.88MHz, the signal combining rate is 245.76MHz, and the final rate reaches 491.52MHz.
  • Band span is
  • 122.88mhz 122.88 + 20 144.88MHz, 491.52MHz rate signal, when the frequency band occupied signal bandwidth signal rate compared to more than 3 times larger than "2, substantially no increase of the peak, so the test signal rate to 491.52MHz Shaw
  • the CCDF Complementary cumulative Distribution Function
  • the system cuts the peak at low speeds and sees the effect at high speeds.
  • Low-speed peak clipping is easy for FPGA implementation and saves resources, and high-speed observation is effective.
  • the two prediction algorithms are respectively used to test the multi-band carrier signal before the superposition, and the modulation is different.
  • the frequency situation the two prediction algorithms (the absolute value summation method of the prior art and the filtering method of the present application) are respectively used to test the multi-band carrier signal before the superposition, and the modulation is different. The frequency situation.
  • the frequency band used in the band 1 is -61.44 MHz
  • the comparison between the absolute value summation method and the CCDF curve of the IF signal without passing through the peak clipping module is shown in Fig. 17.
  • the time domain effect before and after the absolute value summation peak is shown in Fig. 18; the filtering method and the intermediate frequency signal do not pass the peak clipping.
  • the CCDF curve comparison of the module case is shown in Fig. 19.
  • the time-domain effect before and after the peaking of the filtering method is shown in Fig. 20.
  • the filtering method reduces the probability of over-cutting by summing the peak relative to the absolute value.
  • the performance of the filtering method EVM is better than the absolute value summation method, which is about 1%, as shown in Fig. 21 and Fig. 22.
  • an apparatus for peak clipping of a multi-band signal includes:
  • a peak prediction module 31 configured to predict, by filtering, an output signal after multi-band signal combining processing
  • the threshold detection module 32 is configured to sequentially determine whether the signal value of the predicted output signal is higher than a peak clipping threshold.
  • the peak determining module 33 is configured to determine, when determining that a signal value higher than a peak clipping threshold exists, determine the signal value. The maximum peak of the area where the sample is located;
  • the amplitude and phase determining module 34 is configured to determine, according to the maximum peak value, a peak clipping amplitude parameter corresponding to a signal of each frequency band in the multi-band signal;
  • the peak clipping sequence generating module 35 is configured to generate a peak clipping sequence corresponding to the signal of each frequency band by the peak clipping phase parameter and the fixed length prototype peak clipping sequence;
  • the peak shaving module 36 is configured to subtract the corresponding peak clipping sequence from the signals of the respective frequency bands to obtain a multi-band signal after peak clipping.
  • the peak prediction module 31 is specifically configured to:
  • the combined signal is extracted to obtain a predicted output signal.
  • the method is specifically configured to: determine, corresponding to each sample point, within a preset sampling interval from the sample point Signal value; determining that the maximum value of the signal values is the maximum peak value.
  • the peak determination module 33 is further configured to:
  • the peak determination module 33 is further configured to:
  • the amplitude and phase determination module 34 includes:
  • the peak clipping ratio grading module 37 is configured to determine, according to the signal values of the respective frequency bands corresponding to the maximum peak value and the maximum peak value, the peak clipping ratio corresponding to the signal of each frequency band;
  • the peak signal amplitude and phase calibration module 38 is configured to determine a peak clipping amplitude phase parameter corresponding to the signal of each frequency band from the maximum peak value, the peak clipping threshold value, and the peak clipping ratio.
  • the peak clipping sequence generating module 35 includes:
  • the peak clipping pulse generating module 39 is configured to generate a peak clipping pulse corresponding to the signal of each frequency band by the peak clipping phase parameter and the fixed length peak clipping sequence;
  • the pulse summation module 30 is configured to determine all the peak clipping pulses corresponding to the determined signals of the respective frequency bands as peak clipping sequences corresponding to the signals of the frequency band.
  • the embodiment of the present application further provides an RRU, where the RRU includes: a peak prediction module, configured to predict, by filtering, an output signal after multi-band signal combining processing;
  • a threshold detecting module configured to sequentially determine whether a signal value of the predicted output signal is higher than a peak clipping threshold
  • a peak determining module configured to determine, when determining that a signal value higher than a peak clipping threshold exists, determine a corresponding value of the signal value The maximum peak of the area where the point is located
  • An amplitude determining module configured to determine, according to the maximum peak, a peak amplitude and phase parameter corresponding to a signal of each frequency band in the multi-band signal;
  • a peak clipping sequence generating module configured to generate a peak clipping sequence corresponding to the signal of each frequency band by the peak clipping amplitude phase parameter and the fixed length prototype peak clipping sequence;
  • the peak shaving module is configured to subtract the corresponding peak clipping sequence from the signals of the respective frequency bands to obtain a multi-band signal after peak clipping.
  • the embodiment of the present application further provides an RRU, where the RRU includes: a processor configured to predict an output signal after multi-band signal combining processing by filtering; and sequentially determine the predicted output. Whether the signal value of the signal is higher than the peak clipping threshold; when it is determined that there is a signal value higher than the peak clipping threshold, determining a maximum peak value of the region of the sample point corresponding to the signal value; determining the multi-band signal according to the maximum peak value a peak-amplitude phase parameter corresponding to a signal of each frequency band; a peak clipping sequence corresponding to a signal of each frequency band is respectively generated by the peak clipping amplitude phase parameter and a fixed length prototype peak clipping sequence; and signals of the respective frequency bands are respectively reduced Go to the corresponding peak clipping sequence to get the multi-band signal after peak clipping.
  • the RRU includes: a processor configured to predict an output signal after multi-band signal combining processing by filtering; and sequentially determine the predicted output. Whether the signal value of the signal is higher than
  • the embodiment of the present application provides a method and a device for peak clipping of a multi-band signal, which are used for performing peak estimation and post-cutting processing before a single-channel broadband power amplifier for a multi-band signal, thereby effectively avoiding over-cutting and leakage. Cut, reduce EVM, and can be applied to various frequency bands.
  • embodiments of the present application can be provided as a method, system, or computer program product. Therefore, the present application may employ an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. The form of the case. Moreover, the application can be in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage and optical storage, etc.) in which computer usable program code is embodied.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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Abstract

La présente invention, selon les modes de réalisation, concerne un procédé et un appareil d'écrêtage de signaux multibandes, de sorte à appliquer un traitement d'écrêtage à des signaux multibandes au moyen d'un procédé de filtrage, une valeur de crête étant prédite avant l'amplification de puissance de largeur de bande de canal unique, ce qui évite efficacement un surécrêtage et un écrêtage de fuite, réduit l'EVM et améliore la souplesse d'une application. Selon l'invention, le procédé fait appel : à la prédiction, par filtrage, d'un signal de sortie obtenu après application d'un traitement combiné à des signaux multibandes; à l'évaluation séquentielle du fait qu'une valeur de signal du signal de sortie prédit est supérieure à un seuil d'écrêtage; lorsqu'il est déterminé que la valeur de signal est supérieure au seuil d'écrêtage, à la détermination d'une valeur de crête maximale de la zone où se trouve un point d'échantillonnage correspondant à la valeur de signal; à la détermination, conformément à la valeur de crête maximale, d'un paramètre de phase d'amplitude d'écrêtage correspondant à un signal de chaque bande des signaux multibandes; au fait de générer, respectivement, une séquence d'écrêtage correspondant au signal de chaque bande au moyen du paramètre de phase d'amplitude d'écrêtage et une séquence d'écrêtage prototype de longueur fixe; et à l'obtention de signaux multibandes après l'écrêtage, par soustraction distincte de la séquence d'écrêtage correspondante du signal de chaque bande.
PCT/CN2013/080540 2012-11-01 2013-07-31 Procédé et appareil d'écrêtage de signaux multibandes WO2014067301A1 (fr)

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US11228330B2 (en) 2019-10-16 2022-01-18 Nokia Solutions And Networks Oy Distribution of clipping noise between bands

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