WO2016155244A1 - Procédé de traitement de signal, et dispositif d'émission/réception de signal sans fil - Google Patents

Procédé de traitement de signal, et dispositif d'émission/réception de signal sans fil Download PDF

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Publication number
WO2016155244A1
WO2016155244A1 PCT/CN2015/089266 CN2015089266W WO2016155244A1 WO 2016155244 A1 WO2016155244 A1 WO 2016155244A1 CN 2015089266 W CN2015089266 W CN 2015089266W WO 2016155244 A1 WO2016155244 A1 WO 2016155244A1
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WO
WIPO (PCT)
Prior art keywords
unit
modulated subcarriers
subcarrier
coefficient
shaping filter
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Application number
PCT/CN2015/089266
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English (en)
Inventor
Yuechao GUO
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Lenovo (Beijing) Co., Ltd.
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Publication date
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Publication of WO2016155244A1 publication Critical patent/WO2016155244A1/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
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/26416—Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
    • H04L25/03834—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using pulse shaping
    • 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
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes

Definitions

  • the present disclosure relates to the field of signal processing technique, and more particularly, to a signal processing method and a wireless signal transceiving device.
  • the 5G mobile communication system puts forward higher requirements for air interface technology whose basis is waveform technology.
  • ICI Inter-Carrier Interference
  • transmitting data through GFDM may cause a very high complexity of system processing. How to reduce ICI and provide lower processing complexity become technical problems.
  • Embodiments of the present disclosure provide a signal processing method and a wireless signal transceiving device.
  • a signal processing method applied to a wireless signal transceiving device comprising:
  • a wireless signal transceiving device comprising a modulating unit, a first determining unit, a shifting unit, a first filtering unit, a spreading unit, and a transmitting unit, wherein:
  • the modulating unit is for modulating a to-be-transmitted baseband signal to at least one subcarrier
  • the first determining unit is for determining, for the at least one subcarrier to which the to-be-transmitted baseband signal is modulated, a shaping filter parameter and a spectrum spreading coefficient;
  • the shifting unit is for performing time domain and frequency domain shift-processing on the shaping filter parameter
  • the filtering unit is for filtering the at least one subcarrier based on the shift-processed shaping filter parameter so as to obtain first modulated subcarriers;
  • the spreading unit is for spectrum-spreading the first modulated subcarriers based on the spectrum spreading coefficient so as to obtain second modulated subcarriers;
  • the transmitting unit is for transmitting data based on the second modulated subcarriers.
  • the embodiments of the present disclosure by means of spreading an interval between subcarriers in the original GFDM system, Power Spectrum Density (PSD) of each subcarrier data channel after being filter-shaped does not overlap at all, thereby ICI interference is eliminated, and in order to improve carrier utilization, by means of designing parameters for FTN modulation compression, bandwidth utilization is improved, a decline of bandwidth utilization of the system caused by spreading the interval between subcarriers in GFDM is counteracted.
  • the above described technique of spreading the interval between subcarriers and compressing carrier frequency causes a relatively high complexity of signal transmission, therefore, when filtering the carriers, the spreading coefficient of the frequency domain filtering is usually set to greatly reduce complexity of the filtered signal.
  • the embodiments of the present disclosure reduce interference between carriers without lowering carrier utilization, and control the complexity of wireless signal processing within a reasonable range.
  • FIG. 1 is a flowchart of a signal processing method in a first embodiment of the present disclosure
  • FIG. 2 is a flowchart of a signal processing method in a second embodiment of the present disclosure
  • FIG. 3 is a schematic diagram of principle of a wireless signal transmitter according to an embodiment of the present disclosure
  • FIG. 4 is a flowchart of a signal processing method in a third embodiment of the present disclosure.
  • FIG. 5 is another schematic diagram of principle of a wireless signal transmitter according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic diagram of component structure of a wireless signal transceiving device according to an embodiment of the present disclosure.
  • FIG. 1 is a flowchart of a signal processing method in a first embodiment of the present disclosure, as shown in FIG. 1, the signal processing method is applied to a wireless signal transceiving device in this example.
  • the wireless signal transceiving device may be an antenna system applicable to a base station, a mobile terminal or to a wireless transceiving device such as a wireless router, a relay station and so on.
  • the signal processing method comprises the following steps.
  • Step 101 modulating a to-be-transmitted baseband signal to at least one subcarrier.
  • a to-be-transmitted baseband signal is obtained, and modulated to a corresponding subcarrier.
  • Step 102 determining, for the at least one subcarrier to which the to-be-transmitted baseband signal is modulated, a shaping filter parameter and a spectrum spreading coefficient.
  • GFDM signal discrete mathematical model can be expressed as:
  • s (k, m) is a complex expression of a signal which is already modulated carrying information
  • the following matrix with K ⁇ M order represents a set of modulated complex signals within one subframe:
  • the subcarrier shaping filter can select SINC function, , a shaping filter on each subcarrier is designed to obtain a shaping filter parameter g (n) and a spectrum spreading coefficient (roll-off factor) a.
  • g(n) represents a discrete sequence of sub-carrier shaping filter
  • a represents a roll-off factor (spectrum spreading coefficient) of g (n) .
  • Step 103 performing time domain and frequency domain shift-processing on the shaping filter parameter.
  • time domain and frequency domain shift-processing are performed on g (n) .
  • the expression of g (n) after the shift is
  • Step 104 filtering the at least one subcarrier based on the shift-processed shaping filter parameter so as to obtain first modulated subcarriers.
  • Step 105 spectrum-spreading the first modulated subcarriers based on the spectrum spreading coefficient so as to obtain second modulated subcarriers, and transmitting data on the second modulated subcarriers.
  • the roll-off factor a is further determined. And the interval between subcarriers is spread as (1+a) times, that is, the spread interval between subcarriers becomes F f , meanwhile K f subcarriers can be accommodated under the pre-designed system bandwidth.
  • FIG. 2 is a flowchart of a signal processing method in a second embodiment of the present disclosure.
  • the signal processing method is applied to a wireless signal transceiving device in this example.
  • the wireless signal transceiving device may be an antenna system applicable to a base station, a mobile terminal or to a wireless transceiving device such as a wireless router, a relay station and so on. Comparing to the first embodiment, this embodiment further comprises the following steps before transmitting data.
  • Step 206 determining, for the second modulated subcarriers, a time domain compression coefficient based on the spectrum spreading coefficient.
  • the number of time slots that can be accommodated within each subcarrier in each frame is M gf .
  • Step 207 performing time domain compression on the second modulated subcarriers based on the time domain compression coefficient, so as to obtain third modulated subcarriers; transmitting data with the third modulated subcarriers.
  • the time domain compression is performed to decrease an interval between the second modulated subcarriers.
  • the modulated data (K ⁇ M matrix) within one subframe of the original GFDM is again mapped as a new matrix K gf ⁇ M gf , it is supposed that s gf (k, m) indicates one already-modulated complex symbol within the set, then it is obtained:
  • g (n) is the pulse shaping filter
  • N is an upstream sampling times of prototype filter g (n)
  • the transmitted signal in GFDM-FTN is represented as:
  • the above formula is a to-be-transmitted signal on which time domain compression has been performed, a transmitter structure directly implemented in time domain by the GFDM-FTN signal can be determined from the above formula, as shown in FIG. 3.
  • FIG. 4 is a flowchart of a signal processing method in a third embodiment of the present disclosure, as shown in FIG. 4, the signal processing method is applied to a wireless signal transceiving device in this example.
  • the wireless signal transceiving device may be an antenna system applicable to a base station, a mobile terminal or to a wireless transceiving device such as a wireless router, a relay station and so on.
  • the signal processing method further comprises the following steps.
  • Step 401 to step 403 are same as the step 101 to step 103 in FIG. 1.
  • Step 404 setting a spreading coefficient for a frequency domain filter parameter in the shaping filter to spread the frequency domain response of the shaping filter parameter.
  • Step 405 performing Fourier transform on the at least one subcarrier, to transform the at least one subcarrier into a frequency domain signal.
  • Step 406 filtering the frequency domain signal based on the spreading coefficient and the shift-processed shaping filter parameter, performing inverse Fourier transform on a filtered signal to obtain the first modulated subcarriers.
  • Step 407 spectrum-spreading the first modulated subcarriers based on the spectrum spreading coefficient so as to obtain second modulated subcarriers.
  • the roll-off factor a is further determined.
  • the interval between subcarriers is spread as (1+a) times, that is, the spread interval between subcarriers becomes f gf , meanwhile K gf subcarriers can be accommodated under the pre-designed system bandwidth.
  • the number of spread subcarriers is also made an integer by appropriately designing a total bandwidth fc of the system and the value of a. There is no overlap between spread signals, the subcarriers, which are completely orthogonal, so it is possible to completely eliminate ICI interference.
  • Step 408 determining, for the second modulated subcarriers, a time domain compression coefficient based on the spectrum spreading coefficient.
  • the number of time slots that can be accommodated within each subcarrier in each frame is M gf .
  • Step 409 performing time domain compression on the second modulated subcarriers based on the time domain compression coefficient, so as to obtain third modulated subcarriers; transmitting data with the third modulated subcarriers.
  • the time domain compression is performed to decrease an interval between the second modulated subcarriers.
  • g (n) is the pulse shaping filter
  • N is an upstream sampling times of prototype filter g (n)
  • the transmitted signal in GFDM-FTN is represented as:
  • complexity is determined based on the number of complex multipliers required during an implementing process, considering the discrete mathematical models of GFDM-FTN signal and OFDM signal, complexity of direct implementation of the two signals can be obtained as:
  • the OFDM symbol is represented as:
  • g (n) is the prototype filter, indicates an offset position of the corresponding subcarriers on the frequency domain
  • s f (k, m) ⁇ (n-rmN) indicates a modulated complex symbol data stream after upstream sampling is performed on each subcarrier.
  • DFT NM (.) and IDFT NM (.) indicate discrete Fourier at NM points and discrete Fourier inverse transform, respectively. Their meanings are provided as below:
  • DFT NM (g ( ⁇ n> NM-1 ) indicates the frequency domain transform of the prototype filter.
  • L is the spreading coefficient of the frequency domain filtering
  • the value of L can be selected according to the size of the designed spreading coefficient a of the prototype pulse shaping filter g (n) , for example, when the value of a is relatively small, the spectrum spreading is relatively small, a relatively small value can be taken for L, and vice versa.
  • FIG. 6 is a schematic diagram of component structure of a wireless signal transceiving device according to an embodiment of the present disclosure, as shown in FIG. 6, the wireless signal transceiving device comprises a modulating unit 60, a first determining unit 61, a shifting unit 62, a first filtering unit 63, a spreading unit 64, and a transmitting unit 65, wherein:
  • the modulating unit 60 is for modulating a to-be-transmitted baseband signal to at least one subcarrier
  • the first determining unit 61 is for determining, for the at least one subcarrier to which the to-be-transmitted baseband signal is modulated, a shaping filter parameter and a spectrum spreading coefficient;
  • the shifting unit 62 is for performing time domain and frequency domain shift-processing on the shaping filter parameter
  • the filtering unit 63 is for filtering the at least one subcarrier based on the shift-processed shaping filter parameter so as to obtain first modulated subcarriers;
  • the spreading unit 64 is for spectrum-spreading the first modulated subcarriers based on the spectrum spreading coefficient so as to obtain second modulated subcarriers;
  • the transmitting unit 65 is for transmitting data based on the second modulated subcarriers.
  • the wireless signal transceiving device in the embodiment of the present disclosure further comprises a second determining unit (not shown in FIG. 6) and a compressing unit (not shown in FIG. 6) , in which:
  • the second determining unit is for determining, for the second modulated subcarriers, a time domain compression coefficient based on the spectrum spreading coefficient;
  • the compressing unit is for performing time domain compression on the second modulated subcarriers based on the time domain compression coefficient, so as to obtain third modulated subcarriers; the time domain compression is performed to decrease an interval between the second modulated subcarriers;
  • the transmitting unit is further for transmitting data with the third modulated subcarriers.
  • the second determining unit described above is further for selecting a reciprocal of a sum of the spectrum spreading coefficient and one as the time domain compression coefficient.
  • the wireless signal transceiving device in the embodiment of the present disclosure further comprises a setting unit (not shown in FIG. 6) , a first transforming unit (not shown in FIG. 6) , a second filtering unit (not shown in FIG. 6) , and a second transforming unit (not shown in FIG. 6) , wherein:
  • the setting unit is for setting a spreading coefficient for a frequency domain filter parameter in the shaping filter to spread a frequency band of the shaping filter parameter;
  • the first transforming unit is for performing Fourier transform on the at least one subcarrier, to transform the at least one subcarrier into a frequency domain signal;
  • the second filtering unit is for filtering the frequency domain signal based on the spreading coefficient and the shift-processed shaping filter parameter
  • the second transforming unit is for performing inverse Fourier transform on a filtered signal to obtain the first modulated subcarriers.
  • the spectrum spreading coefficient and the spectrum spreading coefficient are in a positive correlation.
  • respective units in the wireless signal transceiving device shown in FIG. 6 may be understood by making reference to the signal processing method described above and the related description of the embodiments thereof.
  • the functions of the respective units in wireless signal transceiving device in FIG. 6 may be implemented by programs running on a processor, and may also be implemented by specific logic circuits.
  • the device/apparatus and methods disclosed therein may also be implemented by other manners.
  • the above described device/apparatus embodiments are merely illustrative, for example, the unit division is only a logical function division, there may be other division manners in practical implementation, such as: a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted or not executed.
  • coupling, or direct coupling, or communicative connection between the shown or discussed respective components may be achieved through some interfaces
  • indirect coupling or communicative connection between devices or units may be electrical, mechanical, or other forms.
  • Units described above as separate members may be or may not be physically separated, components showed as units may be or may not be physical units; they may be located at one place or distributed to a plurality of network cells; it is possible to select some or all of the units therein to achieve the purpose of solutions in the embodiments according to the actual needs.
  • respective functional units in the embodiments of the present disclosure may be all integrated in one processing unit and may also be separated as one unit each, or two or more units may also be integrated in one unit; the aforesaid integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional unit.
  • all or part of the steps of the above method embodiments may be completed by instructing relevant hardware through programs, these programs may be stored in a computer readable storage medium, the steps included in the above method embodiments will be executed when the programs are executed;
  • the aforesaid storage medium includes various mediums capable of storing program codes like a mobile storage device, a Read Only Memory (ROM) , a magnetic disk, or an optical disk.
  • the above integrated units of the present disclosure may also be stored in a computer readable storage medium when being implemented in the form of a software functional module and sold and used as an independent product.
  • the substance or the part that contributes to the prior art of the technical solutions of embodiments of the present disclosure may be reflected in the form of a software product
  • the computer software product may be stored in a storage medium, and include several instructions for causing a computer apparatus (which may be a personal computer, a server, or a network device) to fully or partially perform the method described in the various embodiments of the present disclosure.
  • the aforesaid storage medium includes various mediums capable of storing program codes like a mobile storage device, a Read Only Memory (ROM) , a magnetic disk, or an optical disk.
  • ROM Read Only Memory

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Discrete Mathematics (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

La présente invention concerne un procédé de traitement de signal, et un dispositif d'émission/réception de signal sans fil. Le procédé consiste à : moduler un signal de bande de base devant être transmis, sur au moins une sous-porteuse; déterminer, pour la ou les sous-porteuses sur lesquelles le signal de bande de base devant être transmis est modulé, un paramètre de filtre de mise en forme et un coefficient d'étalement de spectre; exécuter un processus de décalage dans le domaine temporel et le domaine fréquentiel sur le paramètre de filtre de mise en forme; filtrer la ou les sous-porteuses d'après le paramètre de filtre de mise en forme traité en décalage, de sorte à obtenir de premières sous-porteuses modulées; exécuter un étalement de spectre sur les premières sous-porteuses modulées, d'après le coefficient d'étalement de spectre, de sorte à obtenir de secondes sous-porteuses modulées; et transmettre des données sur la base des secondes sous-porteuses modulées.
PCT/CN2015/089266 2015-04-01 2015-09-09 Procédé de traitement de signal, et dispositif d'émission/réception de signal sans fil WO2016155244A1 (fr)

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CN201510152925.2 2015-04-01
CN201510152925.2A CN106161315B (zh) 2015-04-01 2015-04-01 信号处理方法及无线信号收发设备

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CN103248455A (zh) * 2013-04-12 2013-08-14 西安理工大学 基于广义频分复用技术的多载波无比率编码的传输方法
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WO2015032313A2 (fr) * 2013-09-09 2015-03-12 Huawei Technologies Co., Ltd. Système et procédé d'estimation de voie pour un multiplexage par répartition en fréquence généralisé (gfdm)

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