WO2007107107A1 - Procédé et appareil de mappage sélectif et procédé et appareil de séquence de transmission partielle - Google Patents

Procédé et appareil de mappage sélectif et procédé et appareil de séquence de transmission partielle Download PDF

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Publication number
WO2007107107A1
WO2007107107A1 PCT/CN2007/000889 CN2007000889W WO2007107107A1 WO 2007107107 A1 WO2007107107 A1 WO 2007107107A1 CN 2007000889 W CN2007000889 W CN 2007000889W WO 2007107107 A1 WO2007107107 A1 WO 2007107107A1
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WIPO (PCT)
Prior art keywords
unit
fourier transform
fast fourier
inverse fast
sequence
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Application number
PCT/CN2007/000889
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English (en)
Chinese (zh)
Inventor
Bin Li
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007107107A1 publication Critical patent/WO2007107107A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/18—Information format or content conversion, e.g. adaptation by the network of the transmitted or received information for the purpose of wireless delivery to users or terminals
    • 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
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information

Definitions

  • the transmitting end can reduce the PAPR value of the transmitted signal sequence, thereby reducing the linearity requirement of the power amplifier in the transmitter.
  • the receiver at the receiving end must know the PAPR related parameters used by the transmitting end to obtain the minimum PAPR value for the transmitted signal, so as to correctly receive the data sent by the transmitting end.
  • the receiver must know the M used by the sender.
  • Embodiments of the present invention provide a selective mapping method and apparatus thereof, and a partial transmission sequence method and apparatus thereof, which can truly improve the PAPR performance of an OFDM signal in an OFDM mobile communication system.
  • a selective mapping apparatus includes: a serial to parallel conversion unit, configured to perform a serial-to-parallel conversion process on a sequence of input signals by a transmitting end; and a multiplication unit, configured to convert each of the serial-to-parallel transform units a parallel signal and a corresponding sequence element in the fixed sequence group are multiplied; a first merging unit, configured to combine the multiplication result of the multiplication unit and related information of the corresponding sequence element; the inverse fast Fourier transform unit And performing a reverse fast Fourier transform on the signal sequence after the merging unit merging process; and a selecting unit, configured to perform peak power to average power ratio respectively on each transformed output result of the inverse fast Fourier transform unit after the transmitting end Calculation, and choose a parallel signal change with the smallest peak power to average power ratio The output is changed and sent.
  • FIG. 2 is a schematic diagram of a main implementation process of processing a signal by applying a partial transmission sequence method in the prior art
  • the receiver When the selective mapping method and the partial transmission sequence method are implemented in the OFDM mobile communication system in the prior art, the receiver must know the PAPR related parameters used by the transmitting end to obtain the PAPR minimum value of the OFDM signal. Correctly receiving the signal data sent by the demodulation transmitter, so that the implementation of the selective mapping method and the partial transmission sequence method in the OFDM mobile communication system can really improve the PAPR performance of the OFDM signal, and therefore In the implementation of the method and the partial transmission sequence method, the transmitting end increases the transmission function of transmitting the PAPR related parameters, and further considers the influence of the transmitting end transmitting the PAPR related parameters on the PAPR performance of the OFDM signal.
  • FIG. 3 is a schematic flowchart of an embodiment of the selective mapping method of the present invention.
  • Step 10 The transmitting end performs serial-to-parallel conversion processing on the input signal sequence
  • Step 20 Perform the following steps 30, 40, and 50 for each parallel-converted parallel signal sequence:
  • Step 30 first multiplying the parallel signal and a corresponding sequence element in a certain fixed sequence group
  • Step 50 Finally, perform an IFFT transform process on the signal sequence after the merge processing; in step 60, the transmitting end performs PAPR calculation on the IFFT transform output results of each parallel signal processed by the foregoing steps 30, 40, and 50;
  • the system side in order to obtain better receiver error performance, the system side usually enables the receiver to perform coherent demodulation based on the insertion of pilot signals in the traffic signal, thereby obtaining better receiver error. performance. Therefore, in the embodiment of the present invention, the influence of the pilot signal on the error performance of the receiver is also considered. Further, the influence of the pilot signal and other related signals on the error performance of the receiver can be considered, that is, the pilot signal can be extended. Become: Pilot signal + other useful Signal.
  • FIG. 4 is a schematic diagram of an implementation process of implementing a selective mapping method in an OFDM mobile communication system by applying the principle of the selective mapping method of the present invention
  • the specific implementation process is as follows:
  • the PAPR value calculation process is sequentially performed on the M IFFT transform output results, and an IFFT transform output result having the smallest PAPR value is selected and transmitted.
  • the input signal sequence needs to be first converted into a plurality of parallel signal sequences by serial-to-parallel conversion, and the length of each parallel signal sequence after conversion is set. All are N; then each parallel signal sequence is multiplied by a fixed sequence consisting of M sequence elements of length N to obtain corresponding M multiplication result sequences ⁇ l , w 2 , ..., ⁇ . Assuming that the length of the parallel signal sequence is N d , then each and everychan; k has a length of N d .
  • the pilot subcarrier length used to carry the pilot signal sequence is ⁇ ⁇ for carrying PAPR correlation
  • the information (here, the pointer information indicating the specific position of the relevant sequence element in the fixed sequence) is N earned, then multiplying the parallel signal with the corresponding sequence element in the fixed sequence, the pilot subcarrier
  • IFFT transform processing is performed on each of the combined subcarriers, thereby correspondingly obtaining M IFFT transform output sequence And performing PAPR calculation on each IFFT transform output result sequence, and selecting an IFFT transform output result sequence having the smallest PAPR value for transmission.
  • the present invention also proposes a selective mapping device.
  • FIG. 5 is a structural block diagram of an embodiment of the selective mapping device of the present invention, including serial-to-parallel conversion.
  • the unit 10 the multiplying unit 20, the first combining unit 30, the IFFT transform unit 40, and the selecting unit 50, wherein the specific functions of the respective constituent units are as follows:
  • the serial-to-parallel transform unit 10 is configured to perform a serial-to-parallel conversion process on the input signal sequence by the transmitting end, and a multiplication unit 20, configured to convert each parallel signal and a selected fixed sequence group after the serial-to-parallel transform unit 10 a corresponding sequence element in the multiplication operation;
  • a first merging unit 30, configured to combine the multiplication result of the multiplication unit 20 and the related information of the corresponding sequence element;
  • sequence element related information herein may be, but not limited to, used to indicate that the sequence element is in the fixed sequence group Pointer information of a specific location;
  • the merging process herein refers to a process of sequentially carrying the multiplied result and the related information of the corresponding sequence element in a subcarrier on a subcarrier;
  • the IFFT transform unit 40 is configured to perform an IFFT transform on the signal sequence after the combining unit 30 is merged;
  • the selecting unit 50 is configured to send, by the transmitting end, each IFFT after the transform processing by the IFFT transform unit 40.
  • the converted output results are respectively subjected to PAPR value calculation processing, and a parallel signal IFFT transform output result with the smallest PAPR is selected and transmitted.
  • the receiving error rate of the receiver is also considered to be improved, and the corresponding pilot signal sequence is inserted in the transmission signal sequence of the transmitting end, thereby improving the receiving error rate of the receiver.
  • FIG. 6 is a structural block diagram of an embodiment of the selective mapping apparatus of the present invention for improving the error performance of the receiving end.
  • the second combining unit 60 is further configured to be used. Performing a combining process on the combined signal sequence and the corresponding set pilot signal sequence of the first combining unit 30, that is, the combining processing result of the first combining unit 30 and the correspondingly set pilot signal sequence are sequentially carried in a On the subcarrier.
  • the selection unit 50 in FIG. 5 above specifically includes a power ratio calculation subunit 510 and a selection subunit 520, and the functions of the two units are as follows:
  • the power ratio calculation subunit 510 is configured to perform PAPR calculation processing on each IFFT transform output result after the transform processing by the IFFT transform unit 40 by the transmitting end;
  • the selecting subunit 520 is configured to calculate, according to the PAPR calculation result of the power ratio calculation subunit 510, a parallel signal IFFT transform output result with the smallest PAPR value to be transmitted.
  • FIG. 7 is a flowchart of an implementation principle of an embodiment of a partial transmission sequence method according to the present invention.
  • the implementation process is as follows:
  • Step 100 The transmitting end performs serial-to-parallel transformation and division into a plurality of sub-blocks.
  • Step 200 The transmitting end performs an IFFT transform process on each of the divided sub-blocks respectively.
  • Step 300 Find a group that satisfies the following Steps 400 to 600 process variables of the process condition: Step 400, performing an IFFT transform process on the set of variables;
  • Step 500 Perform weighting processing on the IFFT transform result sequence of each of the divided sub-blocks and the corresponding sequence element in the set of variables.
  • Step 600 the sum of the IFFT transform output result sequence of the set of variables and the output result sequence of each sub-block weighted processing is required to have a minimum PAPR value
  • Step 700 The transmitting end sends the sum of the output results obtained by processing the set of variables found above.
  • the system side typically enables the receiver to perform coherent demodulation based on the insertion of pilot signals in the traffic signal, resulting in better receiver error performance. Therefore, in the partial transmission sequence method of the present invention, the influence of the pilot signal on the error performance of the receiver is also considered. Further, the influence of the pilot signal and other related signals on the error performance of the receiver, that is, the pilot signal, can be considered. Can be extended to: Pilot signals + other useful signals.
  • a corresponding pilot signal sequence may be further determined, and an IFFT transform process is performed on the pilot signal sequence, and then the system side is required to find a set of variables to satisfy the following conditions:
  • the sum of the IFFT transform output result of the set of variables, the output result of each sub-block weighting process, and the IFFT transform output result of the corresponding pilot signal sequence has a minimum PAPR value
  • the transmitting end transmits the output result processed based on the found set of variables, thereby ensuring that the transmitted OFDM signal has the smallest PAPR value.
  • FIG. 8 the figure is a schematic diagram of an implementation process of implementing a partial transmission sequence method in an OFDM mobile communication system by applying the principle of the partial transmission sequence method of the present invention, and the specific implementation process is as follows:
  • the transmitting end divides the entire OFDM subcarrier into three parts:
  • a data subcarrier configured to carry a transmitted signal sequence
  • PAPR subcarrier used to carry PAPR related parameters
  • Vl , v 2 , ..., 3 ⁇ 4 (here a complex variable), which is temporarily determined, carry it and modulate it into the PAPR subcarrier, and perform IFFT transform processing on the generated PAPR subcarrier.
  • Vl , v 2 , ..., 3 ⁇ 4 (here a complex variable), which is temporarily determined, carry it and modulate it into the PAPR subcarrier, and perform IFFT transform processing on the generated PAPR subcarrier.
  • Vl , v 2 , ..., 3 ⁇ 4 here a complex variable
  • the sender transmits the sum of the output results with the smallest PAPR value.
  • the transmitting end first serially converts and converts the entire input signal sequence into M sub-blocks. If it is assumed that the total length of the entire signal sequence is N d , then the divided sub-blocks are The lengths are all N d IM; respectively performing IFFT transform processing on each of the divided sub-blocks to obtain a corresponding M IFFT output result sequence; and performing IFFT transform processing on the pilot sub-carriers carrying the pilot signals, thereby obtaining one A sequence of output results of length N p ; for each set of variables (here a complex variable) that are temporarily determined, carried and modulated into the PAPR subcarrier, and the IFFT transform process is also performed on the newly generated PAPR subcarrier.
  • N p for each set of variables (here a complex variable) that are temporarily determined, carried and modulated into the PAPR subcarrier, and the IFFT transform process is also performed on the newly generated PAPR subcarrier.
  • the IFFT transform output result sequence of the above M parallel signal sequences is weighted by using the temporarily determined Vl , ! 2 , ..., 3 ⁇ 4 variable groups, and then the M weighted processed output results and the pilot subcarriers are processed.
  • the IFFT transform output result and the PAPR subcarrier IFFT transform output result perform an addition process, and finally find an optimal set of variables ⁇ v 2 , . . . , v M such that the sum of the above addition results can reach a minimum PAPR value.
  • the sum of the output results with the PAPR minimum is sent.
  • the first IFFT transform unit 200 is configured to perform an IFFT transform process on each of the sub-blocks divided by the blocking unit 100;
  • the variable finding unit 300 is configured to find a set of variables that satisfy the following conditions:
  • the sum of the IFFT transform output of the set of variables and the output result of each of the sub-block weighting processes is required to have a minimum PAPR value
  • the signal transmitting unit 400 is configured to send, by the transmitting end, the sum of the output results obtained by processing the set of optimal variables found by the variable searching unit 300 to ensure that the OFDM signal sent by the transmitting end has the smallest PAPR value.
  • a block diagram of an embodiment of a variable finding unit in a partial transmission sequence device based on the composition of FIG. 9 includes a variable determining unit 3010, a third IFFT transform unit 3020, a weighting processing unit 3030, and a first phase.
  • the adding unit 3040 and the determining notifying unit 3050, wherein the respective components function as follows:
  • variable determining unit 3010 configured to determine a set of temporary variables
  • the third IFFT transform unit 3020 is configured to perform an IFFT transform process on the temporary variable determined by the variable determining unit 3010;
  • the weighting processing unit 3030 is configured to perform weighting processing on the IFFT transform result after performing the IFFT transform processing on each sub-block by the first IFFT transform unit 200, and the corresponding sequence element in the temporary variable determined by the variable determining unit 3010, respectively;
  • a first adding unit 3040 configured to perform a processing of adding, by the third IFFT transform unit 3020, a result of performing IFFT transform on the temporary variable, and an output result of performing weighting processing on each sub-block by the weighting processing unit 3030;
  • the determining notification unit 3050 is configured to notify the variable determining unit 3010 to re-determine a set of temporary variables when the PAPR value of the addition result of the first adding unit 3040 is not the minimum, until a set of optimal variables is found such that the above processing is performed. The sum of the output results has the smallest PAPR value.
  • the method further includes a pilot signal determining unit 500 and a second
  • the pilot signal determining unit 500 is configured to predetermine a corresponding pilot signal sequence;
  • the second IFFT transform unit 600 is configured to perform an IFFT transform process on the pilot signal sequence determined by the pilot signal determining unit 500;
  • variables sought by the variable finding unit 300 described above should satisfy:
  • the sum of the IFFT transform output result of the set of variables, the output result of each sub-block weighting process, and the IFFT transform output result of the pilot signal sequence has the smallest PAPR value.
  • a block diagram of an embodiment of a variable finding unit in a partial transmission sequence device based on the composition of FIG. 11 includes a variable determining unit 3010, a third IFFT transform unit 3020, a weighting processing unit 3030, and a second phase.
  • the adding unit 3060 and the determining notifying unit 3050, wherein the respective components function as follows:
  • variable determining unit 3010 configured to determine a set of temporary variables
  • the third IFFT transform unit 3020 is configured to perform an IFFT transform process on the temporary variable determined by the variable determining unit 3010;
  • the weighting processing unit 3030 is configured to perform weighting processing on the IFFT transform result after performing the IFFT transform processing on each sub-block by the first IFFT transform unit 200, and the corresponding sequence element in the temporary variable determined by the variable determining unit 3010, respectively;
  • a second adding unit 3060 a conversion result for performing the IFFT transform on the temporary variable by the third IFFT transform unit 3020, an output result after the weighting processing unit 3030 performs weighting processing for each sub-block, and a second IFFT transform unit 600
  • the pilot signal sequence performs an IFFT transform result and performs an addition process
  • the determining notification unit 3050 is configured to notify the variable determining unit 3010 to re-determine a set of temporary variables when the PAPR value of the addition result of the second adding unit 3060 is not the minimum, until a set of optimal variables is found to cause the above processing The sum of the output results has the smallest PAPR value.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de mappage sélectif qui permet d'améliorer l'efficacité PAPR de signaux OFDM dans un système de communication mobile DFDM et qui comprend: la conversion série-parallèle de séquences de signal d'entrée par le terminal émetteur et l'exécution des traitement suivants sur chacun des signaux parallèles convertis: la multiplication du signal parallèle par un élément de séquence correspondant faisant partie d'un ensemble de séquences fixes; la combinaison du résultat multiplié avec les informations associées de l'élément de séquence correspondant; l'exécution d'une transformation rapide de Fourier inverse sur la séquence de signal combinée; le calcul des rapports de puissance valeur de crête sur valeur moyenne des résultats transformés des traitements précédents effectués sur chacun des signaux parallèles par le terminal d'émission séparément; et la sélection et l'émission d'un résultat transformé de signal parallèle avec un rapport minimal de puissance valeur de crête sur valeur moyenne en fonction des résultats calculés.
PCT/CN2007/000889 2006-03-20 2007-03-19 Procédé et appareil de mappage sélectif et procédé et appareil de séquence de transmission partielle WO2007107107A1 (fr)

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CN200610064985.X 2006-03-20
CN 200610064985 CN101043491B (zh) 2006-03-20 2006-03-20 部分发送序列方法及其装置

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TWI482467B (zh) * 2013-01-24 2015-04-21 Univ Nat Sun Yat Sen 用於正交分頻多工系統之降低功率峰均比的裝置
CN106059982A (zh) * 2016-07-07 2016-10-26 哈尔滨工程大学 一种基于选择性映射和压扩变换的ado‑ofdm***峰均比抑制方法
WO2021093073A1 (fr) * 2019-12-13 2021-05-20 Zte Corporation Schéma de modulation basé sur une insertion non nulle et permettant un faible rapport de puissance de crête sur puissance moyenne

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