WO2009089733A1 - Procédé et dispositif de limitation du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence multiporteuses - Google Patents

Procédé et dispositif de limitation du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence multiporteuses Download PDF

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Publication number
WO2009089733A1
WO2009089733A1 PCT/CN2008/073738 CN2008073738W WO2009089733A1 WO 2009089733 A1 WO2009089733 A1 WO 2009089733A1 CN 2008073738 W CN2008073738 W CN 2008073738W WO 2009089733 A1 WO2009089733 A1 WO 2009089733A1
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Prior art keywords
carrier
signal
noise
peak
channel signal
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PCT/CN2008/073738
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English (en)
Chinese (zh)
Inventor
Zhiqiang Zou
Jie Wu
Binbin Zhang
Guanjun Ni
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Huawei Technologies Co., Ltd.
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Publication of WO2009089733A1 publication Critical patent/WO2009089733A1/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
    • 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

  • the present invention relates to Orthogonal Frequency Division Multiplexing (OFDM) technology, and more particularly to a method and apparatus for peak-to-average ratio suppression in a multi-carrier OFDM system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM technology has become the fourth generation mobile communication with its high frequency utilization, strong inter-symbol interference (ISI) and inter-carrier interference (ICI) capabilities. Key technology.
  • ISI inter-symbol interference
  • ICI inter-carrier interference
  • the high speed data stream is serially converted and divided into N parallel substreams for inverse Fourier transform (IFFT, Inverse).
  • IFFT inverse Fourier transform
  • Fast Fourier Transform converts the frequency domain signal into the time domain.
  • the length of the IFFT output is a time domain sample signal called OFDM symbol.
  • CP Cyclic Prefix
  • the CP is first removed from the received time domain signal, and then Fourier transform (FFT, Fast Fourier Transform), digital demodulation, and the like are performed to correctly receive the data.
  • FFT Fast Fourier Transform
  • the peak-to-average ratio of the signal at the transmitting end (PAPR, Peak) To Average Power Ratio ) will also increase the force.
  • PAPR Peak
  • the power amplifier has a certain linear region.
  • the signal with peak-to-average ratio will reduce the efficiency of the power amplifier and increase the power consumption. Therefore, the suppression of the peak-to-average ratio is an urgent problem to be solved.
  • multi-carrier technology is generally adopted, that is, the system includes multiple carriers, and each carrier includes multiple subcarriers.
  • the transmission of the multi-carrier information can be completed by one transmitter and one power amplifier, the volume and cost of the base station can be greatly reduced, but the number of sub-carriers in the multi-carrier OFDM system More, the peak-to-average ratio of the channel signal after the combination is larger, which puts higher requirements on the multi-carrier peak-to-average ratio suppression.
  • FIG. 1 shows a block diagram of the multi-stage matched filtering clipping scheme.
  • the formation of the multi-carrier combined time domain signal may be briefly described as: the transmission data and the control data bits of each single carrier on each symbol are encoded by the encoder according to a predetermined coding scheme, and then subjected to corresponding constellation mapping according to the modulation mode.
  • the multi-carrier combined channel signals are obtained one by one.
  • the multi-carrier combining channel signal formed above enters the clipping processing process shown in FIG. 1, first extracting clipping noise higher than a predetermined threshold in the channel signal, and then removing the out-of-band portion of the clipping noise through the multi-stage matched filtering module.
  • the noise on some important subcarriers is finally superimposed by the matched filtered clipping noise on the delayed multicarrier combined time domain signal to form a clipped multicarrier combined time domain signal.
  • the matched filter coefficients here are obtained by accumulating the source filter coefficients after NCO modulation, and the same filter coefficients are used for each level of matched filtering.
  • the scheme given above can achieve better clipping effect under the condition of satisfying the same error vector magnitude, peak code domain error and adjacent channel power leakage ratio, the clipped multi-carrier combined channel signal can be obtained.
  • the lower peak-to-average ratio but the scheme is mainly for Code-Division Multiple Access (CDMA) systems. If the scheme shown in Figure 1 is directly applied to OFDM In the system, the modulation and coding modes and carrier power of the frequency domain subcarriers on different OFDM symbols may be different, and the allowed performance loss may be different.
  • CDMA Code-Division Multiple Access
  • the filter coefficients are designed in a high-order modulation manner, the clipping capability of the matched filter will be very limited, and the peak-to-average ratio of the matched filtered multi-carrier OFDM system will be very limited. Still 4 ⁇ high, and the choice of filter coefficients with a large error vector magnitude (EVM, Error Vector Magnitude) loss, will inevitably lead to high-order modulation subcarriers can not meet the EVM requirements specified by the protocol, seriously affecting the system chain Road performance.
  • EVM Error Vector Magnitude
  • Embodiments of the present invention provide a method for peak-to-average ratio suppression in a multi-carrier OFDM system, which can effectively suppress peak-to-average ratio in a multi-carrier OFDM system.
  • Embodiments of the present invention provide a device for peak-to-average ratio suppression in a multi-carrier OFDM system, which is capable of effectively suppressing a peak-to-average ratio in a multi-carrier OFDM system.
  • a method for peak-to-average ratio suppression in a multi-carrier orthogonal frequency division multiplexing system comprising: combining baseband frequency domain signals of each carrier into a time domain on each orthogonal frequency division multiplexing OFDM symbol Multi-carrier combined channel signal;
  • the cancellation noise is inversely superimposed on the delayed multi-carrier combining channel signal to perform peak-to-average ratio suppression.
  • a device for peak-to-average ratio suppression in a multi-carrier orthogonal frequency division multiplexing system comprising: a multi-carrier combining channel signal module, configured to baseband frequency domain signals of each carrier on each OFDM symbol, Combining into a time domain multi-carrier combined channel signal;
  • a delay module configured to delay the signal of the multi-carrier combined channel
  • a cancellation noise acquisition module configured to extract clipping noise from the multi-carrier combining channel signal; according to the position of the clipping noise in the multi-carrier combining channel signal, a pre-generated extended kernel waveform Extracting a pulse-like signal of a channel length; using the pulse signal of the type and multiplying the extracted clipping noise to obtain cancellation noise;
  • the peak-to-average ratio suppression module is configured to inversely superimpose the cancellation noise on the delayed multi-carrier combining channel signal to perform peak-to-average ratio suppression.
  • the method and device for peak-to-average ratio suppression in the multi-carrier OFDM system extracts clipping noise from the multi-carrier combining channel signal, and according to the position of the clipping noise in the channel, the pre-generated lengthening is performed.
  • the pulse waveform of the channel length is intercepted on the kernel waveform, and then the cancellation noise is obtained by multiplying the pulse signal with the extracted clipping noise, and is inversely superimposed to the delayed multi-carrier combined channel signal.
  • the extended kernel waveform is generated in advance, when the pulse-like signal of the channel length is intercepted, the CP region and the symbol region in the multi-carrier combining channel signal are simultaneously considered, and the cancellation noise calculated using the intercepted pulse-like signal is also At the same time, for the CP area and the symbol area, after the reverse superposition cancels the noise, the peak-to-average ratio suppression is performed on the multi-carrier combined channel signal over the entire channel length, thereby effectively suppressing the peak-to-average ratio.
  • FIG. 1 is a schematic block diagram of a multi-match filter clipping scheme in a multi-carrier system in the prior art
  • FIG. 2 is a schematic block diagram of a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for suppressing a peak-to-average ratio in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 4 is a flowchart showing a method for implementing a single-carrier baseband frequency-domain signal in a method for suppressing a peak-to-average ratio in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 5 is a flowchart of implementing a two-carrier baseband frequency domain signal combining method in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 6 is a flow chart of a time-domain in the peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of extracting clipping noise by a single threshold in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 8 is a flowchart of generating a lengthened kernel waveform in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 9 is a schematic diagram showing waveform changes of a period-like extension of a pulse-like signal in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention.
  • FIG. 10 is a schematic diagram of intercepting a channel length type pulse signal in an extended kernel waveform according to a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 11 is a flowchart of an indicator evaluation in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 12 is a schematic diagram of a peak-to-average ratio suppression apparatus in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 13 is a schematic diagram showing a structure of a kernel waveform generation module in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 14 is a schematic structural diagram of a signal module of a multi-carrier combining channel in a multi-carrier OFDM system according to an embodiment of the present invention.
  • FIG. 15 is a structural diagram of a cancellation noise acquisition module in a multi-carrier OFDM system according to an embodiment of the present invention. detailed description
  • FIG. 2 is a schematic block diagram of a method for suppressing a peak-to-average ratio in a multi-carrier OFDM system according to an embodiment of the present invention.
  • FIG. 2 shows an example of two carriers, and the baseband frequency domain signal 1 corresponds to carrier 1.
  • the baseband frequency domain signal 2 corresponds to carrier 2.
  • the baseband frequency domain signals of carrier 1 and carrier 2 are first multi-carrier combined to form a multi-carrier combined channel signal; then the peak detection of the multi-carrier combined channel signal is performed, and the specific implementation can be performed on the multi-carrier combined channel signal.
  • the sampling points are sorted according to the power from large to small, and the preset number of clipping noises are sorted; the position of the extracted clipping noise in the multi-carrier combining channel signal is intercepted from the extended kernel waveform.
  • the pulse-like signal of the channel length multiplies the extracted clipping noise and the pulse-like signal to obtain cancellation noise; and the obtained cancellation noise is inversely superimposed to the delayed multi-carrier combined channel signal, after the inverse superposition
  • the result is evaluated by the indicator. If the indicator is passed, it is directly sent to the IF channel for subsequent processing. If the indicator evaluation fails, the peak detection of the multi-carrier combined channel signal after the reverse superposition cancellation noise is performed.
  • FIG. 3 is a flowchart of a method for suppressing a peak-to-average ratio in a multi-carrier OFDM system according to an embodiment of the present invention. Before the process shown in Figure 3, an extended kernel waveform is generated in advance. The flow shown in Figure 3 includes:
  • Step 301 Combine the baseband frequency domain signals of each carrier into a time domain multi-carrier combining channel signal on each OFDM symbol.
  • Step 302 Extract clipping noise from the multi-carrier combining channel signal, and intercept a channel-like pulse from the extended kernel waveform according to the position of the clipping noise in the multi-carrier combining channel signal. signal.
  • Step 303 Multiply the pulse signal with the extracted clipping noise to obtain a noise cancellation noise.
  • Step 304 Reversely superimpose the cancellation noise on the delayed multi-carrier combining channel signal to perform peak-to-average ratio suppression.
  • the method for suppressing the peak-to-average ratio in the multi-carrier OFDM system according to the embodiment of the present invention extracts clipping noise from the signal of the multi-carrier combining channel, and according to the position of the clipping noise in the channel, from the pre-generated extended kernel waveform The pulse-like signal of the channel length is intercepted, and then the cancellation noise is obtained by multiplying the pulse-like signal with the extracted clipping noise, and is inversely superimposed to the delayed multi-carrier combined channel signal.
  • the extended kernel waveform is generated, when the pulse-like signal of the channel length is intercepted, the CP region and the symbol region in the multi-carrier combining channel signal are simultaneously considered, and the cancellation noise calculated by using the intercepted pulse-like signal is simultaneously For the CP area and the symbol area, after the reverse superposition cancels the noise, the peak-to-average ratio suppression is performed on the multi-channel combined channel signal over the entire channel length, thereby effectively suppressing the peak-to-average ratio.
  • the baseband frequency domain signal sent by each carrier is obtained, and the implementation process is as shown in FIG. 4, and the process includes:
  • Step 401 The data signal sent by each carrier on each OFDM symbol of the multi-carrier OFDM system is coded according to a predetermined coding manner.
  • Step 402 Perform constellation mapping on the encoded data signal of each carrier according to a predetermined modulation manner.
  • the modulation mode may be Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (Quarature Amplitude Modulation). 16QAM) and so on.
  • Step 403 Insert control information such as a pilot signal for the data signal of each carrier after the constellation mapping.
  • Step 404 Set a space (TR, Tone Reservation) subcarrier and a left and right protection subcarrier of each carrier to 0, and generate a baseband frequency domain signal sent by each carrier on each OFDM symbol.
  • Step 501 The baseband frequency domain signal on each OFDM symbol is processed by a low-speed IFFT, for example. Time domain signals are formed as processed by 1x speed IFFT.
  • Step 502 Add CP to the time domain signal after the IFFT processing.
  • Step 503 The time domain signal after adding the CP is sampled to form a high-speed channel signal of each carrier.
  • the signal in this step is too much, and can be realized by interpolation filtering at one or more levels.
  • the specific process can be as shown in Figure 6.
  • the process shown in Figure 6 includes:
  • Step 601 Interval interpolation 0 is performed on the time domain signal after adding the CP.
  • Step 602 Perform a finite impulse response (FIR, Finite Impulse Response) filtering on the time domain signal after the interval interpolation 0.
  • FIR Finite Impulse Response
  • Step 603 Repeat step 601.
  • Step 604 Perform a half-band filtering (HBF, Half Band Filter) processing on the time domain signal after the interpolation of step 603.
  • HPF Half Band Filter
  • a time domain signal of 4 times speed can be obtained.
  • the time domain signal of the higher speed can be implemented by using multiple HBFs in series, which will not be described here.
  • Step 504 The NCO is used to modulate the high-speed channel signals of each carrier obtained in step 503 to respective frequency points, which can be digitally realized by directly multiplying the frequency modulation signals, and the phase of the frequency modulation signals between the OFDM symbols is continuous. Finally, the channel signals of each OFDM carrier after frequency modulation are accumulated one by one to obtain a multi-carrier combined channel signal of each multi-carrier OFDM system on each OFDM symbol, and the multi-carrier combined channel signal can be expressed by the following formula:
  • X in the above formula is the high-speed channel signal of each carrier, / is the carrier mark, and the value is 1 to L, L is the carrier number, which is the frequency modulation frequency of each carrier, and the frequency difference between carriers satisfies the configuration requirement; W is the phase of the first frequency of the frequency modulated signal of the first carrier in the current OFDM symbol, and is used to ensure that the phase of the frequency modulated signal between the OFDM symbols is continuous; It is the sampling point interval of the multi-carrier combined channel signal; O ⁇ is the number of sampling points in the CP area of the channel, which is the number of points in the symbol area in the channel.
  • the above-mentioned power is sorted in ascending order, and then the clipping noise of the maximum peak exceeding the preset threshold is extracted, which can be realized by the following specific methods:
  • Upper middle and upper middle ,, GGaatete table indicates the pre-determined threshold threshold value.
  • middle; , ; is to cut the wave noise noise factor, and use it for controlling the control to extract and extract the amplitude of the wave noise noise, mark Record the wave noise of the clipping noise in the position of the channel in the pass channel.
  • the configuration of the configuration needs to consider the special characteristics of the subcarrier carrier wave and the TTRR subcarrier carrier wave. .
  • the number of pre-distortion distortion coefficients is subject to the coded rate rate, the constellation modulation method, and the subcarrier carrier wave function.
  • the power rate, the EEVVMM loss loss sum, and the frequent utterance template board, etc., and the peak-to-peak average performance and the actual complex complexity are also limited.
  • the arrangement of the number of pre-distortion distortion coefficients is, therefore, when the number of pre-distortion distortion coefficients is set for the carrier wave of the OOFFDDMM sub-carrier, it should be fully considered.
  • Test Considering the above factors affecting the subcarrier, the signal distortion on the subcarrier can be effectively controlled, so that the performance loss on each subcarrier is effectively controlled.
  • the TR subcarriers in the carrier within each OFDM symbol do not carry any useful signals, theoretically allowing arbitrary predistortion coefficients to be configured, but excessively large clipping noise on the TR subcarriers not only affects
  • the modulation of adjacent subcarriers at the receiving end also significantly reduces the efficiency of the transmitter. Therefore, the predistortion coefficient on the TR subcarrier needs to be appropriately suppressed to reduce the adverse effects.
  • the noise energy superimposed on the TR subcarrier is appropriately suppressed, which not only facilitates the demodulation of the terminal data subcarrier, but also indirectly improves the efficiency of the transmitter.
  • the extended kernel waveform is obtained by the predistortion coefficient of each carrier on the frequency domain subcarrier, and the generated pulse signal waveform is cyclically extended and combined, taking a two-cycle extension as an example.
  • Figure 8 which includes:
  • This type of pulse signal is a periodic signal and the maximum real peak is at the first sample point.
  • Step 802 Repeat the cycle-like pulse signal obtained in step 801 for one cycle to form a two-cycle pulse-like signal.
  • Step 803 Complement the left and right CPs on the two-cycle type pulse signals obtained in step 802, and obtain a pulse-like signal of two-cycle extension of each OFDM carrier, which can be expressed by:
  • Kerneh (Sym_ L - CP _ L + m) ⁇ ⁇ m ⁇ CP _ L
  • k ⁇ h (m) ( -5 p — CP_ L + l ⁇ m ⁇ CP—L + Sym_ L
  • the kernel waveform is always 0 phase and is at the maximum at the C3 ⁇ 4 + 1 sample point. In order to facilitate future amplitude and phase adjustment, the extended kernel waveform can be normalized.
  • step 803 the steps of oversampling by interpolation filtering may be added between step 803 and step 804.
  • the noise is in the same position in the channel signal.
  • Figure 10 shows a schematic diagram of intercepting channel length-like pulse signals in an extended kernel waveform. Appropriate phase and amplitude adjustment for the above-mentioned pulse-like signals, so that the maximum value of the adjusted pulse-like signal and the phase of the noise peak are the same, and the amplitude is equivalent.
  • the pulse of the normalized channel length can be pulsed.
  • the signal and channel clipping noise are multiplied to obtain superimposed cancellation noise.
  • the corresponding N cancellation noises are accumulated and inversely superimposed to the delayed multi-carrier combined channel signal to form a multi-carrier combined channel signal obtained after clipping noise cancellation.
  • the clipping algorithm standard may include the target peak-to-average ratio and the target calculation number, when the clipping noise is cancelled.
  • the peak-to-average ratio of the multi-carrier combined channel signal obtained later is smaller than the target peak-to-average ratio, or the peak-to-average ratio of the multi-carrier combined channel signal obtained after the clipping noise cancellation is greater than the target peak-to-average ratio, but the number of calculations has been More than the maximum number of calculations, it is considered that the peak-to-average ratio has been suppressed Comply with the clipping algorithm to stop the standard.
  • Figure 11 shows the flow of the indicator evaluation, which includes:
  • Step 1101 Determine whether the peak-to-average ratio of the multi-carrier combining channel signal is greater than the target calculation number. If yes, go directly to step 1104, otherwise go to step 1102.
  • Step 1102 Determine whether the peak-to-average ratio of the signal of the multi-carrier combining channel is smaller than the target peak-to-average ratio. If yes, go directly to step 1104. Otherwise, go to step 1103.
  • Step 1103 Return to perform the step of extracting clipping noise from the multi-carrier combining channel signal.
  • the steps of delaying the multi-carrier combining channel signal, performing the extraction of the clipping noise, intercepting the kernel waveform, obtaining the cancellation noise, and inversely superimposing the cancellation noise are all implemented in the foregoing. the same.
  • Step 1104 Send the multi-carrier combined channel signal to the intermediate frequency channel for further processing.
  • the method provided by the embodiment of the present invention can be used for the number of carriers and any multi-carrier frequency spacing, and an arbitrary modulation mode can be configured for each frequency carrier subcarrier of each carrier on each OFDM symbol.
  • FIG. 12 is a schematic structural diagram of an apparatus for peak-to-average ratio suppression in a multi-carrier OFDM system according to an embodiment of the present invention, the apparatus includes:
  • the multi-carrier combining channel signal module 11 is configured to combine the baseband frequency domain signals of each carrier into a time domain multi-carrier combined channel signal on each OFDM symbol.
  • the delay module 12 is configured to delay the multi-carrier combining channel signal.
  • Denoising noise acquisition block 13 for extracting clipping noise from the multi-carrier combining channel signal; according to the position of the clipping noise in the multi-carrier combining channel signal, in a pre-generated A pulse-like signal of a channel length is intercepted on the extended kernel waveform; and the canceled noise is obtained by multiplying the extracted pulse noise with the extracted clipping noise.
  • the peak-to-average ratio suppression module 14 is configured to inversely superimpose the cancellation noise on the multi-carrier combining channel signal after the delay, and perform peak-to-average ratio suppression.
  • the cancellation noise acquisition module 13 extracts the multi-carrier combined channel signal generated by the multi-carrier combining channel signal module 11 Clipping noise, and according to the position of the clipping noise in the channel, intercept the pulse-like signal of the channel length from the extended kernel waveform, and then multiply the extracted pulse noise to obtain the cancellation noise, and then the peak
  • the average ratio suppression module 14 inversely superimposes the cancellation noise obtained by the cancellation noise acquisition module 13 to the delayed multi-carrier combination channel signal.
  • the cancellation noise acquisition module 13 simultaneously considers the CP region and the symbol region in the multi-carrier combining channel signal when intercepting the pulse-like signal of the channel length, and uses the intercepted pulse-like signal to calculate The cancellation noise is also applied to the CP area and the symbol area at the same time, so that the peak-to-average ratio is inversely superimposed on the suppression module 14 to cancel the noise, and the peak-to-average ratio is suppressed for the entire channel length of the multi-carrier combined channel signal, thereby realizing effective peak-average Than suppression.
  • the device also includes a kernel waveform generation module 15 for generating an extended kernel waveform.
  • FIG. 13 is a schematic structural diagram of a kernel waveform generating module 15 in a multi-carrier OFDM system according to an embodiment of the present invention. As shown in FIG. 13, the kernel waveform generating module 15 may include:
  • the first inverse Fourier transform IFFT unit 151 is configured to perform high-speed I F F T processing on the pre-distortion coefficients of the frequency domain sub-carriers of each carrier to obtain a pulse-like pulse signal of each carrier.
  • the first cyclic prefix CP unit 152 is configured to periodically extend the over-type pulse signal of each carrier, and supplement the left and right CPs for the cyclically extended pulse-like signal to obtain a periodic extension class of each carrier. Pulse signal.
  • the first numerically controlled oscillator NCO unit 153 is configured to modulate the cyclic extension type pulse signals of each of the carriers to respective frequency points.
  • the first accumulating unit 154 is configured to accumulate the cyclic extension type pulse signals of each carrier modulated to respective frequency points to obtain an extended kernel waveform.
  • FIG. 14 is a schematic structural diagram of a multi-carrier combining channel signal module 11 in a multi-carrier OFDM system according to an embodiment of the present invention.
  • the multi-carrier combining channel signal module 11 may include:
  • the baseband frequency domain signal unit 111 is configured to acquire a baseband frequency domain signal transmitted by each carrier on each OFDM symbol.
  • a second inverse Fourier transform IFFT unit 112 configured to perform the baseband frequency domain signal low Double speed IFFT processing.
  • the second cyclic prefix CP unit 113 is configured to add the time domain signal obtained by the low-speed IFFT processing to the CP.
  • the over-sampling unit 114 is configured to perform the time-domain signal after the CP is added to obtain a high-speed channel signal of each carrier.
  • the second numerically controlled oscillator NCO unit 115 is configured to modulate the high-speed channel signals of each of the carriers to respective frequency points.
  • the second accumulating unit 116 is configured to accumulate the high-speed channel signals of each carrier modulated to respective frequency points to obtain a multi-carrier combining channel signal.
  • FIG. 15 is a schematic structural diagram of a cancellation noise acquisition module 13 in a multi-carrier OFDM system according to an embodiment of the present invention. As shown in FIG. 15, the cancellation noise acquisition module 13 includes:
  • the peak detecting unit 131 is configured to extract, from the multi-carrier combining channel signal, a peak whose peak value is higher than a preset threshold and meet the number of extracted clipping noises.
  • the kernel waveform intercepting unit 132 is configured to align the position of each of the clipping noises with the maximum peak value of the extended kernel waveform, and respectively use the alignment point as a reference point to intercept the pulse of the channel length corresponding to each clipping noise. signal.
  • the cancellation noise calculation unit 133 is configured to multiply the intercepted each type of pulse signal and the corresponding clipping noise, and accumulate the multiplication result as cancellation noise.
  • the device provided by the embodiment of the present invention may further include an indicator evaluation module 16 configured to determine whether the peak-to-average ratio of the multi-carrier combined channel signal after the reverse superimposition cancellation noise is greater than the target calculation number, and if so, Transmitting the multi-carrier combining channel signal after the noise cancellation to the intermediate frequency channel, otherwise continuing to evaluate whether the peak-to-average ratio of the multi-carrier combining channel signal of the reverse superimposed cancellation noise is smaller than the target peak-to-average ratio, and if so, Transmitting the anti-noise multi-carrier combining channel signal to the intermediate frequency channel, otherwise transmitting the reverse superimposed cancellation noise multi-carrier combining channel signal to the delay module 12 and the cancellation noise acquiring module 13 continue processing;
  • the multi-carrier combining channel signal after the reverse superposition cancellation noise is smaller than the target peak-to-average ratio value, and if so, the multi-carrier combining channel signal after the anti-noise cancellation is superimposed Send to the intermediate frequency channel, otherwise continue to judge whether the peak-to-average ratio of the multi-carrier combined channel signal after the reverse superimposition cancellation noise is greater than the target calculation number, and if so, the multi-carrier combination after the inverse cancellation of the cancellation noise
  • the channel channel signal is sent to the intermediate frequency channel, otherwise the reverse superimposed cancellation noise multi-carrier combining channel signal is sent to the delay module 12 and the cancellation noise acquisition module 13 to continue processing.
  • the method and apparatus for peak-to-average ratio suppression in a multi-carrier OFDM system extracts clipping noise from a multi-carrier combining channel signal, and according to the position of the clipping noise in the channel, from the pre-generated extended kernel
  • the pulse-like signal of the channel length is intercepted on the waveform, and the cancellation noise is obtained by multiplying the pulse-like signal with the extracted clipping noise, and is inversely superimposed to the delayed multi-carrier combined channel signal.
  • the extended kernel waveform is generated in advance, when the pulse-like signal of the channel length is intercepted, the CP region and the symbol region in the multi-carrier combining channel signal are simultaneously considered, and the cancellation noise calculated using the intercepted pulse-like signal is also At the same time, for the CP area and the symbol area, after the reverse superposition cancels the noise, the peak-to-average ratio suppression is performed on the multi-carrier combined channel signal over the entire channel length, thereby effectively suppressing the peak-to-average ratio.
  • Non-volatile storage medium which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • a computer device may It is a personal computer, a server, or a network device, etc. that performs the methods described in various embodiments of the present invention.

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Abstract

L'invention concerne un procédé de limitation du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence (OFDM) multiporteuses, prégénérant une onde noyau allongée. Selon ledit procédé : des signaux de domaine fréquentiel de bande de base de chaque porteuse sont combinés en signaux de canal de combinaison multiporteuses de domaine temporel sur chaque symbole de multiplexage par répartition orthogonale de la fréquence (S301); des bruits écrêtés sont extraits des signaux de canal de combinaison multiporteuses, et des signaux de type impulsions présentant une certaine longueur de canal sont interceptés à partir de l'onde noyau allongée en fonction de la position des bruits écrêtés dans les signaux de canal de combinaison multiporteuses (S302); les signaux de type impulsions sont multipliés par les bruits écrêtés extraits afin d'obtenir des bruits d'annulation (S303); les bruits d'annulation sont inversement superposés sur les signaux de canal de combinaison multiporteuses à retard pour limiter le rapport valeur de crête sur valeur moyenne (S304). L'invention concerne également un dispositif de limitation de rapport de valeur de crête sur valeur moyenne pour un système OFDM.
PCT/CN2008/073738 2007-12-28 2008-12-25 Procédé et dispositif de limitation du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence multiporteuses WO2009089733A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710306945 2007-12-28
CN200710306945.6 2007-12-28
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