WO2009089753A1 - Procédé et dispositif pour l'élimination 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 pour l'élimination 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
WO2009089753A1
WO2009089753A1 PCT/CN2008/073803 CN2008073803W WO2009089753A1 WO 2009089753 A1 WO2009089753 A1 WO 2009089753A1 CN 2008073803 W CN2008073803 W CN 2008073803W WO 2009089753 A1 WO2009089753 A1 WO 2009089753A1
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Prior art keywords
carrier
channel signal
clipping noise
peak
frequency domain
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PCT/CN2008/073803
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English (en)
Chinese (zh)
Inventor
Zhiqiang Zou
Jie Wu
Binbin Zhang
Erni Zhu
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Huawei Technologies Co., Ltd.
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Publication of WO2009089753A1 publication Critical patent/WO2009089753A1/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 (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
  • 0F Li technology becomes the first with its high frequency utilization rate, strong Inter Symbol Interference (ISI) and Inter Carrier Interference (ICI).
  • 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 Fouri er Transform converts the frequency domain signal into the time domain.
  • the length of the NIFF output is N time-domain sample symbols, called 0FDM symbols.
  • CP cyclic prefix
  • Cycl ic Prefix can be inserted between user data to form a cyclically extended OFDM symbol.
  • FFT Fast Fourier Transform
  • the peak-to-average ratio (PAPR) of the signal at the transmitting end increases accordingly.
  • PAPR peak-to-average ratio
  • a transmitter of a wireless base station in a mobile communication system uses a power amplifier to transmit a signal to compensate for signal attenuation due to propagation distance.
  • Power amplifiers have a certain linear region. Signals with peak-to-average ratios reduce the efficiency of the power amplifier and increase power consumption. Therefore, the suppression of 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 sub-carriers. Wave.
  • 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 is more More, the PAPR 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-match filtering clipping scheme.
  • the forming 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, and the encoder performs coding according to a predetermined coding scheme and then performs 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 multi-carrier combined time domain signal to form a clipped multi-carrier combined time domain signal.
  • the matched filter coefficients here are obtained by accumulating the source filter coefficients after NC0 modulation, and the same filter coefficients are used for each stage of matched filtering.
  • the prior art scheme 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, that is, the clipped multi-carrier combining channel can be obtained.
  • the signal has a lower peak-to-average ratio, but the scheme is mainly for CDMA systems.
  • the clipping scheme implemented by matched filtering shown in Figure 1 cannot be directly applied to multi-carrier OFDM systems, but currently there is no multi-carrier.
  • the 0FDM system achieves an effective peak-to-average ratio suppression scheme. Summary of the invention
  • Embodiments of the present invention provide a method for peak-to-average ratio suppression of a multi-carrier 0FDM system, which can effectively suppress a peak-to-average ratio in a multi-carrier ⁇ F leg system.
  • Embodiments of the present invention provide a device for peak-to-average ratio suppression of a multi-carrier 0FDM system, which is capable of multi-carrier
  • the peak-to-average ratio in the 0F leg system is effectively suppressed.
  • a method for peak-to-average ratio suppression in a multi-carrier orthogonal frequency division multiplexing system comprising:
  • the frequency domain response of the clipping noise corresponding to each carrier is obtained, and is inversely superimposed to the baseband frequency domain signal of the corresponding carrier on the OFDM symbol, and the peak-to-average ratio suppression is performed.
  • 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 combine the baseband frequency domain signals of each carrier into a multi-carrier combined channel signal on each orthogonal frequency division multiplexing OFDM symbol;
  • a delay module configured to delay a baseband frequency domain signal of each carrier
  • a clipping noise acquisition module configured to acquire, from the multi-carrier combining channel signal, clipping noise corresponding to each carrier, where the length of the clipping noise is a symbol length;
  • the peak-to-average ratio suppression module is configured to acquire the frequency domain response of the clipped noise corresponding to each carrier and symbol length, and inversely superimpose the baseband frequency domain signal after the corresponding carrier delay to perform peak-to-average ratio suppression.
  • a baseband frequency domain signal of each carrier is combined into a time-domain multi-carrier combined channel signal on each OF ⁇ symbol,
  • the clipping noise corresponding to each carrier is obtained, the length of the clipping noise is a symbol length, and the frequency domain response corresponding to the clipping noise of each carrier is inversely superimposed to the corresponding carrier.
  • the frequency domain signal is delayed in the OFDM symbol, thereby achieving effective suppression of the peak-to-average ratio in the multi-carrier OFDM system by superposing additional frequency domain noise on each carrier.
  • 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 method for suppressing a peak-to-average ratio in a multi-carrier 0FDM 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 0FDM system according to an embodiment of the present invention
  • FIG. 4 is a flowchart of realizing a frequency domain signal transmitted by each carrier in an 0FDM symbol in a peak-to-average ratio suppression method in a multi-carrier 0FDM system according to an embodiment of the present invention
  • FIG. 5 is a flowchart of implementing a multi-carrier combined channel signal in a peak-to-average ratio suppression method in a multi-carrier 0FDM system according to an embodiment of the present invention
  • FIG. 6 is a flow chart of index evaluation in a 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 clipping noise extraction in a peak-to-average ratio suppression method in a multi-carrier ⁇ system according to an embodiment of the present invention
  • 8a ⁇ b are clipped noise interception methods in a peak-to-average ratio suppression method in a multi-carrier OFDM system according to an embodiment of the present invention. Schematic diagram of the principle;
  • FIG. 9 is a schematic diagram showing the principle of amplitude phase adjustment of a frequency domain response 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 structural diagram of a peak-to-average ratio suppression apparatus in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 11 is a first embodiment of a clipping noise acquisition module in a peak-to-average ratio suppression apparatus in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 12 is a second schematic structural diagram of a clipping noise acquisition module in 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 structural diagram of a multi-carrier combining channel signal module in a peak-to-average ratio suppression apparatus in a multi-carrier OFDM system according to an embodiment of the present invention
  • FIG. 14 is a schematic diagram showing a first structure of a peak-to-average ratio suppression module in a peak-to-average ratio suppression apparatus in a multi-carrier 0FDM system according to an embodiment of the present invention
  • FIG. 15 is a second schematic structural diagram of a peak-to-average ratio suppression module in a peak-to-average ratio suppression apparatus in a multi-carrier 0FDM system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION In the process of implementing the present invention, the inventors discovered that:
  • the modulation and coding modes, carrier power, etc. of the subcarriers on different OFDM symbols may be different, and the permissible performance loss may be different.
  • the symbols use the same filter coefficients for matched filtering.
  • the filter coefficients are designed in a high-order modulation mode.
  • the clipping ability of the matched filter will be very limited.
  • the peak-to-average ratio of the matched filtered multi-carrier 0FDM system is still high.
  • the filter coefficients are selected with a large error vector magnitude (EVM, Error Vector Magni tude) loss, which inevitably causes the high-order modulation subcarriers to fail to meet the EVM requirements specified by the protocol, which seriously affects the link performance of the system.
  • EVM Error Vector Magni tude
  • 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.
  • the baseband frequency domain signal 1 of carrier 1 and carrier 2 and the baseband frequency domain signal 2 are first multi-carrier combined.
  • the road after forming the multi-carrier combined channel signal, performs index evaluation. If the indicator evaluation is passed, it is directly sent to the intermediate frequency channel for subsequent processing. If the index evaluation fails, the clipping noise is extracted from the multi-carrier combined channel signal, and the extraction will be extracted.
  • the clipping noise is intercepted by the symbol length and then assigned to carrier 1 and carrier 2.
  • the baseband frequency domain signal after the upper delay is subjected to peak-to-average ratio suppression, and the operation of the carrier 2 is the same as that of the carrier 1.
  • the new baseband frequency domain signal using carrier 1 and carrier 2 described above can continue to perform the operation of multi-carrier combining.
  • 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.
  • the process includes: Step 301: Combining baseband frequency domain signals of each carrier on each OF symbol Time domain multi-carrier combined channel signal.
  • Step 302 Acquire, from the multi-carrier combining channel signal, clipping noise corresponding to each carrier and symbol length.
  • Step 303 The frequency domain response corresponding to the clipping noise of each carrier and symbol length is inversely superimposed to the baseband frequency domain signal after the carrier delay, and the peak-to-average ratio suppression is performed.
  • a baseband frequency domain signal of each carrier is combined into a time-domain multi-carrier combined channel signal on each OFDM symbol, and the multi-carrier combined signal is combined In the channel signal, the clipping noise corresponding to the length of each carrier and symbol is obtained, and then the frequency domain response of the clipping noise corresponding to each carrier and symbol length is inversely superimposed to the frequency domain signal corresponding to the carrier delay, thereby Effective suppression of the peak-to-average ratio in a multi-carrier 0F system is achieved by superimposing additional frequency domain noise on each carrier.
  • the frequency domain signal sent by each carrier in the 0FDM symbol is obtained.
  • the implementation process is as shown in FIG. 4, and the process includes:
  • Step 401 On each 0FDM symbol of the multi-carrier 0FDM system, the data signal on each carrier is coded according to a predetermined coding mode.
  • Step 402 Perform constellation mapping on the encoded data signals of each carrier according to a predetermined modulation manner.
  • Step 403 Insert control information such as a pilot signal for the data signal of each carrier after the constellation mapping.
  • Step 404 Set the idle (', Tone Reservation) subcarrier and the left and right protection subcarriers of each carrier to 0 to generate a baseband frequency domain signal of each carrier.
  • the baseband frequency domain signals of each carrier are combined into a multi-carrier combined channel signal, that is, a multi-carrier combined channel
  • the implementation process of the signal is as shown in FIG. 5 .
  • the process includes: Step 501: On each OF leg symbol, the baseband frequency domain signal of each carrier is used. High-speed IFFT processing, forming a time domain signal.
  • Step 502 Add CP to the IFFT processed time domain signal to form a channel signal for each carrier.
  • Step 503 modulate the channel signals of each carrier obtained in step 502 to respective frequency points by using NC0, which may 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 OF ⁇ carrier after frequency modulation are accumulated one by one to obtain the multi-carrier combined channel signal _y( «) in the multi-carrier OFDM system, which can be expressed by:
  • N is the frequency modulation signal of the first carrier in the 0FDM symbol The phase of the 0th sampling point, through which the phase of the FM signal between the 0F ⁇ symbols is continuous;
  • ⁇ is the sampling point interval of the multi-carrier combining channel signal;
  • CP _ L is the CP region in the multi-carrier combined channel signal ⁇ The number of samples is the number of samples in the symbol area of the multi-carrier combined channel signal;
  • x, ( «) is the channel signal before each carrier is combined.
  • the index evaluation may be firstly used to determine whether the multi-carrier combining channel signal needs to perform peak-to-average ratio suppression, and specifically, a clipping algorithm may be set. Stop criteria, including: maximum iterations and target peak-to-average ratio.
  • Figure 6 shows the flow of the above indicator evaluation, which includes:
  • Step 601 Determine whether the peak-to-average ratio suppression iteration number of the multi-carrier combining channel signal is greater than the maximum number of iterations. If the step 604 is directly performed, otherwise step 602 is performed.
  • Step 602 Determine whether the peak-to-average ratio of the multi-carrier combining channel signal is smaller than the target peak-to-average ratio. If yes, go to step 604, otherwise go to step 603.
  • Step 603 Continue to perform the step of performing clipping noise extraction on the multi-carrier combining channel signal.
  • the clipping noise extraction of the multi-carrier combined channel signal is continued, and subsequent clipping is performed after the clipping noise extraction is performed. Noise interception and other steps.
  • Step 604 Send the multi-carrier combined channel signal to the intermediate frequency channel.
  • the above steps 601 and 602 have no strict order relationship.
  • the above process gives one of the order relationships. It is also possible to first determine whether the peak-to-average ratio of the multi-carrier combined channel signal is smaller than the target peak-to-average ratio, and then judge the multi-load. The peak-to-average ratio of the wave-pass channel signal is greater than the maximum number of iterations.
  • the clipping noise acquisition is divided into two specific implementation manners.
  • the first type is a peak preset threshold Gate of the multi-carrier combined channel signal, determining a portion of the multi-carrier combined channel signal whose peak value is greater than the extraction threshold, and calculating a portion exceeding the preset threshold and a signal of the multi-carrier combined channel
  • the amplitude ratio, the multi-carrier combining channel signal is multiplied by the amplitude ratio, as the clipping noise of the multi-carrier combining channel signal, in the clipping noise of the multi-carrier combining channel signal, the length of the truncated symbol is cut
  • the wave noise is then distributed to the respective carriers by the clipping noise of the intercepted symbol length.
  • Fig. 7 shows the implementation principle of the above-mentioned extraction multi-carrier combining channel signal being larger than the preset threshold portion.
  • the clipping noise length of the multi-carrier combining channel signal is the channel length 3 ⁇ 4 ⁇ - + ⁇ .
  • the frequency domain structure can only process clipping noise of length symbol length at a time, it is necessary to intercept the clipping noise of the above multi-carrier combined channel signal.
  • a simple and feasible strategy is to deal with the peak-to-average ratio suppression of different levels, and to handle the clipping noise at different positions in the multi-carrier combined channel signal.
  • the level here refers to the current peak-to-average ratio suppression of the multi-carrier combined channel signal.
  • the number of iterations for example, when the multi-carrier combining channel signal is currently performing the first iteration, is the first level; when the multi-carrier combining channel signal is currently performing the second iteration, it is the second level.
  • the symbol-length noise signal is intercepted from the end of the multi-carrier combining channel signal, and at even-numbered iterations, the symbol-length noise signal is intercepted from the front of the multi-carrier combining channel signal.
  • the implementation principle of the above-mentioned two-stage clipping noise interception is as shown in Fig. 8, where a shows the processing mode in an odd number of iterations, and b shows the processing mode in an even number of iterations.
  • the clipping noise intercepted by different iterative processes is different in the channel, so that after multiple iterations of the multi-carrier combined channel signal, it is beneficial to suppress the peak-to-average ratio of the entire channel signal.
  • the clipping noise of the output symbol length is as follows: ⁇ (1 - Y ⁇ n+CP L ))y ⁇ n+CP L ), odd iterations
  • the intercepted clipping noise is distributed to each carrier, which can be based on The frequency domain response of the wave noise is used to perform the above-mentioned clipping noise distribution, and the clipping noise of the multi-carrier combined channel signal can be distributed by the NC0 conjugate at the time of complex multiplication.
  • the clipping noise of each carrier has been obtained, and the clipping noise of the symbol length can be directly extracted for each carrier according to the rule of clipping the clipping noise in the first implementation method described above.
  • the frequency domain response in the band is obtained by high-speed FFT processing, and then inversely superimposed to the frequency domain signal of each carrier after delay after appropriate amplitude and phase adjustment. Thereby achieving peak-to-average ratio suppression in a multi-carrier OFDM system.
  • the frequency domain response of obtaining the carrier clipping noise of each carrier may be implemented in another manner, that is, the frequency domain response of the out-of-band portion of each carrier clipping noise is first filtered by using a filter, and the low-frequency extraction is performed after the low-speed extraction.
  • the frequency domain response of each carrier clipping noise is obtained by a single-speed FFT process.
  • Fig. 9 is a schematic diagram showing the implementation of amplitude phase adjustment for each of the above-described carrier frequency domain responses.
  • the amplitude and phase adjustment of the above-mentioned frequency domain response are controlled by the amplitude and phase adjustment factors, and the amplitude and phase adjustment factors are determined by considering the subcarrier parameters and the TR subcarrier parameters.
  • Subcarrier parameters can be derived from link performance Considering, including coding rate, constellation modulation mode, subcarrier power, EVM loss, spectrum template, etc., and peak-to-average ratio performance and implementation complexity also restrict the configuration of the above adjustment factors, so the above factors should be fully considered to select the appropriate range. , phase adjustment factor.
  • the TR subcarrier parameters may include appropriate suppression of the amplitude and phase adjustment factors to attenuate the adverse effects. It can be seen that the embodiment of the present invention allows the TR subcarriers in the OFDM symbol to participate in the peak-to-average ratio suppression, fully utilizes the system physical resources, and can obtain a better peak-to-average ratio suppression effect, and the amplitude on the TR subcarriers.
  • the limitation of the phase adjustment factor also enables the noise energy superimposed on the TR subcarrier to be effectively controlled, which not only facilitates the demodulation of the terminal data subcarrier, but also indirectly improves the efficiency of the transmitter.
  • the frequency domain subcarriers of each carrier may have different characteristics on each OFDM symbol, the amplitude and phase factors configured on different OF symbols are also different.
  • the amplitude, the phase adjustment factor, and the frequency domain clipping noise of each carrier are multiplied, and the result of the complex multiplication can also be referred to as cancellation noise.
  • the frequency domain of each of the above carriers is directly canceled and inversely superimposed on the baseband frequency domain signal of each carrier after the corresponding delay, and the peak-to-average ratio suppression is completed.
  • FIG. 10 is a schematic structural diagram of an apparatus for suppressing peak-to-average ratio in a multi-carrier 0FDM system according to an embodiment of the present invention, where 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 multi-carrier combined channel signal on each 0FDM symbol.
  • the delay module 12 is configured to delay the baseband frequency domain signal of each carrier.
  • the clipping noise acquisition module 13 is configured to acquire, from the multi-carrier combining channel signal, clipping noise corresponding to each carrier, where the length of the clipping noise is a symbol length.
  • the peak-to-average ratio suppression module 14 is configured to obtain the frequency domain response of the clipping noise corresponding to each carrier, and inversely superimpose the signal to the baseband frequency domain signal after the carrier delay, and perform peak-to-average ratio suppression.
  • the multi-carrier combining channel signal module 1 1 combines the frequency domain signals of each carrier on the 0FDM symbol into a time domain multi-carrier combined channel signal.
  • the clipping noise acquisition module 13 obtains clipping noise corresponding to each carrier from the multi-carrier combining channel signal, and the peak-to-average ratio suppression module 14 inversely superimposes the frequency domain response of the clipping noise corresponding to each carrier. Delay to the corresponding carrier on the 0FDM symbol The latter frequency domain signal, thereby effectively suppressing the peak-to-average ratio in the multi-carrier OFDM system by superimposing additional frequency domain noise on each carrier.
  • the clipping noise acquisition module 13 may include two internal structures, which will be described below with reference to FIGS. 11 and 12.
  • the clipping noise acquisition module 13 may include:
  • the indicator evaluation unit 131 is configured to determine whether the peak-to-average ratio of the multi-carrier combining channel signal is greater than the maximum number of iterations, and if yes, send the multi-carrier combining channel signal to the intermediate frequency channel, otherwise continue to determine the multi-carrier combination Whether the peak-to-average ratio of the channel channel signal is smaller than the target peak-to-average ratio, and if so, transmitting the multi-carrier combining channel signal to the intermediate frequency channel, otherwise transmitting the multi-carrier combining channel signal to the clipping noise acquisition performing unit 132 Or determining whether the peak-to-average ratio of the multi-carrier combining channel signal is smaller than a target peak-to-average ratio ratio, and if yes, transmitting the multi-carrier combining channel signal to the intermediate frequency channel, otherwise continuing to determine the multi-carrier combined channel signal
  • the peak-to-average ratio is suppressed whether the number of iterations is greater than the maximum number of iterations. If yes, the multi-carrier combining channel signal is sent
  • the clipping noise acquisition performing unit 132 is configured to acquire, from the multi-carrier combining channel signal output by the index evaluating unit 131, clipping noise corresponding to each carrier, and the length of the clipping noise is a symbol length.
  • the above-described clipping noise acquisition execution unit 132 has two configurations.
  • the clipping noise acquisition execution unit 132 includes:
  • the first extraction execution sub-unit 1321 is configured to extract a portion of the multi-carrier combining channel signal whose peak value exceeds a preset threshold, and calculate an amplitude ratio of the portion exceeding the preset threshold and the multi-carrier combining channel signal, and use The amplitude ratio multiplies the multi-carrier combining channel signal as clipping noise of the multi-carrier combining channel signal.
  • a first intercepting execution sub-unit 1322 configured to intercept a symbol length from a clipping noise tail of the multi-carrier combining channel signal when the current peak-to-average ratio of the multi-carrier combining channel signal is an odd number of times Clipping noise; when the current peak-to-average ratio of the multi-carrier combining channel signal is an even number of times, the clipping noise of the symbol length is intercepted from the front part of the clipping noise of the multi-carrier combining channel signal .
  • the allocation execution sub-unit 1323 is configured to multiply the clipping noise of the symbol length and the conjugate of the frequency-modulated signal of the corresponding carrier to obtain clipping noise corresponding to each carrier, and the clipping noise is a symbol length.
  • the clipping noise acquisition unit 132 may include:
  • a second extraction execution sub-unit 1324 configured to extract a portion of the multi-carrier combining channel signal whose peak value exceeds a preset threshold, and calculate an amplitude ratio of a part of the multi-carrier combining channel signal that exceeds the preset threshold, The amplitude ratio is multiplied by the channel signal of each carrier as the clipping noise of each carrier.
  • a second intercepting execution sub-unit 1325 configured to intercept each of the clipped noises of each of the carriers The clipping noise of the wave, which is the symbol length.
  • FIG. 13 is a schematic structural diagram of a multi-carrier combining channel signal module 11 in a peak-to-average ratio suppression apparatus in a multi-carrier OFDM system according to an embodiment of the present invention, as shown in FIG. 13, based on the structure of the clipping noise acquiring module 13 described above.
  • the multi-carrier combining channel signal module 11 may include:
  • the frequency domain signal unit 111 is configured to acquire a baseband frequency domain signal of each carrier on each OF ⁇ symbol.
  • the IFFT unit 112 is configured to perform high-speed IFFT processing on the baseband frequency domain signal of each carrier.
  • the CP unit 113 is configured to add CP to the frequency domain signal sent by the high-speed IFFT processed carrier in the corresponding OFDM symbol.
  • the NC0 unit 114 is configured to modulate signals of each carrier after the CP is added to respective frequency points.
  • the first accumulating unit 115 is configured to accumulate the channel signals of each carrier modulated to respective frequency points to obtain a multi-carrier combining channel signal.
  • the above-described peak-to-average ratio suppression module 14 has two configurations.
  • the peak-to-average ratio suppression module 14 includes:
  • the high-speed FFT unit 141 is configured to perform high-speed FFT processing on the clipping noise corresponding to each carrier to obtain a corresponding frequency domain response;
  • a first phase adjustment unit 142 configured to perform amplitude and phase adjustment on the frequency domain response using a configured amplitude and phase adjustment factor
  • the second accumulating unit 143 is configured to inversely superimpose the baseband frequency domain signal of each carrier after the delay and the frequency domain response of the corresponding carrier output by the first phase adjustment unit 142, and perform peak-to-average ratio inhibition.
  • the peak-to-average ratio suppression module 14 includes:
  • the filtering unit 144 is configured to filter the clipping noise corresponding to each carrier, and filter out the frequency domain response of the out-of-band portion.
  • the double-speed FFT unit 145 is configured to perform a double-speed FFT processing on the clipping noise of each carrier output by the filter unit 144 to obtain a corresponding frequency domain response.
  • the second phase adjustment unit 146 is configured to perform amplitude and phase adjustment on the frequency domain response output by the one-speed FFT unit 145 using the configured amplitude and phase adjustment factors.
  • the third accumulating unit 147 is configured to inversely superimpose the frequency domain signal of each carrier baseband after the delay and the corresponding carrier frequency domain response output by the second phase adjustment unit 146 to perform peak-to-average ratio suppression. .
  • a method and apparatus for peak-to-average ratio suppression in a multi-carrier OFDM system wherein each baseband frequency domain signal of each carrier is combined into a time-domain multi-carrier combined channel signal from each of the OFDM symbols In the carrier combined channel signal, the clipping noise corresponding to each carrier and symbol length is obtained, and then the frequency domain response of the clipping noise corresponding to each carrier and symbol length is inversely superimposed to the corresponding carrier delay on the 0FDM symbol. After the frequency domain signal, thus passing in each The additional frequency domain noise is inversely superimposed on the carriers to achieve effective suppression of the peak-to-average ratio in the multi-carrier OFDM system.
  • each unit included is only divided according to functional logic, but is not limited to the above division, as long as the corresponding function can be implemented; in addition, the specific name of each functional unit It is also for convenience of distinguishing from each other and is not intended to limit the scope of protection of the present invention.

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Abstract

L'invention concerne un procédé pour l'élimination du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence (OFDM) multiporteuses. Selon ledit procédé : des signaux de domaine fréquentiel de bande de base de chaque porteuse sont combinés en un signal de canal de combinaison multiporteuses de domaine temporel sur chaque symbole OFDM; le bruit d'écrêtage correspondant à chaque porteuse est obtenu à partir du signal de canal de combinaison multiporteuses, la longueur du bruit d'écrêtage étant une longueur de symbole; une réponse de domaine fréquentiel du bruit d'écrêtage correspondant à chaque porteuse et longueur de symbole est obtenue et inversement superposée au signal de domaine fréquentiel de bande de base après que la porteuse correspondante présente un retard sur le symbole OFDM pour éliminer le rapport valeur de crête sur valeur moyenne. L'invention concerne également un dispositif pour l'élimination du rapport valeur de crête sur valeur moyenne dans un système OFDM multiporteuses. La mise en oeuvre du procédé et du système de l'invention permet d'éliminer efficacement le rapport valeur de crête sur valeur moyenne dans le système OFDM multiporteuses.
PCT/CN2008/073803 2007-12-28 2008-12-27 Procédé et dispositif pour l'élimination du rapport valeur de crête sur valeur moyenne dans un système de multiplexage par répartition orthogonale de la fréquence multiporteuses WO2009089753A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN200710306951 2007-12-28
CN200710306951.1 2007-12-28
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