WO2016023194A1 - Fbmc信号的发送方法、接收方法和发射机以及接收机 - Google Patents

Fbmc信号的发送方法、接收方法和发射机以及接收机 Download PDF

Info

Publication number
WO2016023194A1
WO2016023194A1 PCT/CN2014/084289 CN2014084289W WO2016023194A1 WO 2016023194 A1 WO2016023194 A1 WO 2016023194A1 CN 2014084289 W CN2014084289 W CN 2014084289W WO 2016023194 A1 WO2016023194 A1 WO 2016023194A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
interval
frequency
oqam
frequency domain
Prior art date
Application number
PCT/CN2014/084289
Other languages
English (en)
French (fr)
Inventor
屈代明
江涛
李俊
陈磊
Original Assignee
华为技术有限公司
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.)
Filing date
Publication date
Priority to CA2957836A priority Critical patent/CA2957836C/en
Priority to BR112017002602A priority patent/BR112017002602A2/pt
Priority to EP14899710.9A priority patent/EP3171563B1/en
Priority to RU2017107271A priority patent/RU2659352C1/ru
Priority to PCT/CN2014/084289 priority patent/WO2016023194A1/zh
Priority to CN201480080893.3A priority patent/CN106576092B/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to MYPI2017700418A priority patent/MY192108A/en
Priority to KR1020177006754A priority patent/KR101984151B1/ko
Priority to JP2017507827A priority patent/JP6334816B2/ja
Priority to AU2014403687A priority patent/AU2014403687C1/en
Publication of WO2016023194A1 publication Critical patent/WO2016023194A1/zh
Priority to US15/431,472 priority patent/US10135663B2/en

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • H04L27/2627Modulators
    • H04L27/264Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/26416Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12Neutralising, balancing, or compensation arrangements
    • H04B1/123Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2602Signal structure
    • H04L27/26025Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2626Arrangements specific to the transmitter only
    • H04L27/2627Modulators
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2647Arrangements specific to the receiver only
    • H04L27/2649Demodulators
    • H04L27/26534Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/2654Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/26Systems using multi-frequency codes
    • H04L27/2601Multicarrier modulation systems
    • H04L27/2697Multicarrier modulation systems in combination with other modulation techniques
    • H04L27/2698Multicarrier modulation systems in combination with other modulation techniques double density OFDM/OQAM system, e.g. OFDM/OQAM-IOTA system
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36Modulator circuits; Transmitter circuits
    • H04L27/362Modulation using more than one carrier, e.g. with quadrature carriers, separately amplitude modulated
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36Modulator circuits; Transmitter circuits
    • H04L27/365Modulation using digital generation of the modulated carrier (not including modulation of a digitally generated carrier)
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/36Modulator circuits; Transmitter circuits
    • H04L27/366Arrangements for compensating undesirable properties of the transmission path between the modulator and the demodulator

Definitions

  • the embodiments of the present invention relate to the field of communications technologies, and in particular, to a method for transmitting a Filter Bank Multi-Carrier (FBMC) signal, a receiving method, a transmitter, and a receiver.
  • FBMC Filter Bank Multi-Carrier
  • FBMC is a multi-carrier modulation technology. Compared with Orthogonal Frequency Division Multiplexing (OFDM), FBMC has lower out-of-band radiation and higher spectral efficiency, and has good application prospects. .
  • OFDM Orthogonal Frequency Division Multiplexing
  • An important feature of FBMC is that there are different degrees of mutual interference between adjacent subcarriers and adjacent FBMC symbols. For example, the transmitted symbols on any one time-frequency resource will generate additional received signals at adjacent time-frequency resource locations. , causing interference to the useful received signal.
  • OFDM/OQAM Orthogonal Frequency Division Multiplexing (OFDM) / Offset Quadrature Amplitude Modulation (OQAM).
  • OFDM/OQAM differs from OFDM in that OFDM/OQAM systems transmit pure real or pure imaginary OQAM symbols and map them on time-frequency resource elements in a real virtual alternating pattern.
  • the interference of the transmitted symbol to the received signal always appears on the imaginary or real part opposite the transmitted symbol. Therefore, if the channel can remain unchanged in the time domain and the frequency domain, the interference can be eliminated by a real imaginary separation operation after channel equalization.
  • the channel is usually not always constant in the time domain and frequency domain. If the channel changes significantly in the time domain or the frequency domain, the channel changes in the frequency domain in the time domain where the channel changes, and the frequency division multiple access technology is widely used in the wideband multi-carrier system. , also causes significant changes in the frequency domain channel. Therefore, how to eliminate mutual interference of frequency domain boundaries remains to be solved. Summary of the invention
  • Embodiments of the present invention provide a method, a receiving method, and a transmitter for transmitting an FBMC signal.
  • the receiver can effectively eliminate mutual interference at the frequency domain boundary.
  • an embodiment of the present invention provides a method for transmitting an FBMC signal, including: generating an offset quadrature amplitude modulation OQAM symbol included on at least two subbands;
  • the FBMC signal is sent to the receiver.
  • the mapping the OQAM symbols on each subband to each subcarrier includes:
  • the frequency interval ⁇ is achieved as follows:
  • the mapping the OQAM symbols on each sub-band to each sub-carrier separately includes: Mapping the last OQAM symbol on the xth subband to the zth subcarrier; mapping the first OQAM symbol on the (x+1)th subband to the (z+1)th subcarrier; Between the zth subcarrier and the (z+1)th subcarrier, there is a second frequency interval (m+1) A, the ⁇ / represents the first frequency interval, and the m A is a guard band interval.
  • the m is a fraction greater than 0, and the x and z are all positive integers.
  • the interval (m + 1) ⁇ is achieved as follows:
  • the OQAM on each subband Before the symbols are respectively mapped to the respective subcarriers further includes:
  • guard band interval Obtaining the guard band interval according to an overlap factor and an outband suppression factor of the prototype filter and the first frequency interval, where the guard band interval is obtained by:
  • the G is the guard band interval
  • the overlap factor of the prototype filter the P is an out-of-band rejection factor of the prototype filter
  • the ⁇ is the first frequency interval.
  • the method before the generating the FBMC signal by using the frequency domain signal, the method further includes:
  • the OQAM symbols on each of the sub-bands in the frequency domain signal are precoded.
  • the generating the offset quadrature amplitude modulation OQAM symbol on the at least two subbands includes:
  • the generating the FBMC signal by using the frequency domain signal includes:
  • the time domain misalignment is superposed on the time domain signal to obtain the FBMC signal.
  • an embodiment of the present invention further provides a method for receiving an FBMC signal, including: receiving an FBMC signal;
  • the obtaining, by using the received FBMC signal, the frequency domain signal includes:
  • Frequency domain filtering is performed on the signal after DFT to obtain the frequency domain signal.
  • the method before the performing the frequency domain filtering on the DFT signal, the method further includes:
  • Channel equalization is performed on the signal after DFT.
  • the method also includes:
  • the inverse mapping of the frequency domain signal according to the first frequency interval and the second frequency interval includes: The frequency domain signals mapped on the preset subcarriers are inversely mapped according to the first frequency interval and the second frequency interval.
  • the frequency domain signal is inversely mapped according to the first frequency interval and the second frequency interval, and is obtained by being carried on at least two subbands.
  • the method further includes:
  • Channel equalization is performed on the OQAM symbols.
  • the X refers to any one of the frequency domain signals.
  • an embodiment of the present invention provides a transmitter, including:
  • a symbol generating module configured to generate an offset quadrature amplitude modulation OQAM symbol included on at least two subbands
  • a symbol mapping module configured to map the OQAM symbols on each subband to each subcarrier separately to obtain a frequency domain signal, where adjacent subcarriers in the same subband have a first frequency interval, and two adjacent subcarriers a second frequency interval between adjacent subcarriers between the bands, the second frequency interval being a sum of the first frequency interval and the guard band interval, and the guard band interval is a fraction of a first frequency interval;
  • a signal generating module configured to generate the FBMC signal by using the frequency domain signal
  • a sending module configured to send the FBMC signal to the receiver.
  • the symbol mapping module is specifically configured to use the nth OQAM symbol on the Xth subband. Map to the yth subcarrier; the (n+1)th OQAM on the xth subband The symbol is mapped to the (y+1)th subcarrier;
  • the first y subcarrier and the (y+1)th subcarrier have a first frequency interval ⁇ , and the X refers to any one of the at least two subbands, and the ⁇ Refers to any one of the OQAM symbols on the Xth subband, the nth OQAM symbol and the (n+1)th OQAM symbol are two adjacent OQAM symbols on the Xth subband, the x , y, n are positive integers.
  • the frequency interval ⁇ is achieved as follows:
  • the symbol mapping module is specifically configured to map the last OQAM symbol on the X-th sub-band. Mapping to the zth subcarrier; mapping the first OQAM symbol on the (x+1)th subband to the (z+1)th subcarrier;
  • the zth subcarrier and the (z+1)th subcarrier have a second frequency interval (m+1) A, the ⁇ / indicates the first frequency interval, and the m A is protection Band spacing, the m is a fraction greater than 0, and the x and z are both positive integers.
  • the interval (m + 1) ⁇ is achieved as follows:
  • the transmitter further includes:
  • a guard band interval acquisition module configured to: before the symbol mapping module respectively maps OQAM symbols on each subband to each subcarrier, according to an overlap factor and an outband suppression factor of the prototype filter and the first frequency interval Obtaining the guard band interval, where the guard band interval is obtained by:
  • the G is the guard band interval
  • the overlap factor of the prototype filter the P is an out-of-band rejection factor of the prototype filter
  • the ⁇ is the first frequency interval.
  • the transmitter further includes: a precoding module, configured to: before the signal generating module generates the FBMC signal by using the frequency domain signal, The OQAM symbols on each subband of the frequency domain signal are precoded.
  • the symbol generating module is specifically configured to generate an OQAM symbol carried on the same subband for the same user.
  • the signal generating module includes: filtering And performing frequency domain filtering on the frequency domain signal;
  • An inverse discrete Fourier transform module configured to perform an inverse discrete Fourier transform IDFT on the frequency domain filtered frequency domain signal to obtain a time domain signal;
  • a misalignment superposition module configured to perform time domain misalignment superposition on the time domain signal to obtain the FBMC signal.
  • the embodiment of the present invention further provides a receiver, including:
  • a signal receiving module configured to receive the FBMC signal
  • a frequency domain signal acquisition module configured to obtain a frequency domain signal by using the received FBMC signal
  • a signal inverse mapping module configured to inversely map the frequency domain signal according to the first frequency interval and the second frequency interval, to obtain a bearer at least Quadrature amplitude modulated OQAM symbols on two subbands, wherein the first frequency interval is a frequency interval between adjacent subcarriers in the same subband, and the second frequency interval is adjacent to two subbands a frequency interval between adjacent subcarriers, the second frequency interval being a sum of the first frequency interval and the guard band interval, and the guard band interval is A fractional multiple of the first frequency interval.
  • the frequency domain signal acquisition module includes:
  • a time domain signal extraction submodule configured to perform time domain symbol extraction on the received FBMC signal to obtain a time domain signal
  • a discrete Fourier transform sub-module configured to perform a discrete Fourier transform DFT on the time domain signal obtained by extracting the time domain symbols, to obtain a signal after the DFT;
  • a filter is configured to perform frequency domain filtering on the signal after the DFT to obtain the frequency domain signal.
  • the frequency domain signal acquiring module further includes:
  • the first equalizer is configured to perform channel equalization on the signal after the DFT before the filter performs frequency domain filtering on the signal after the DFT.
  • the receiver further includes:
  • a frequency domain signal screening module configured to: after the frequency domain signal acquisition module obtains a frequency domain signal by using the received FBMC signal, select a frequency domain signal that is mapped on the preset subcarrier from the frequency domain signal;
  • the signal inverse mapping module is specifically configured to inversely map a frequency domain signal mapped on a preset subcarrier according to the first frequency interval and the second frequency interval.
  • the receiver further includes:
  • a second equalizer configured to inversely map the frequency domain signal according to the first frequency interval and the second frequency interval, to obtain a quadrature amplitude modulation OQAM symbol carried on at least two subbands, Channel equalization is performed on the OQAM symbols.
  • the signal inverse mapping module includes:
  • a first inverse mapping submodule configured to extract, according to the second frequency interval, the first OQAM symbol carried on the Xth subband from the Xth subband of the frequency domain signal;
  • a second inverse mapping submodule configured to extract, after the first OQAM symbol carried on the Xth subband, sequentially extract from the Xth subband of the frequency domain signal according to the first frequency interval a second OQAM symbol carried on the xth subband up to the last OQAM symbol; a third inverse mapping submodule, configured to (x+1) subbands from the frequency domain signal according to the second frequency interval The first OQAM symbol carried on the (x+1)th subband is extracted; wherein the X refers to any one of the frequency domain signals.
  • the embodiments of the present invention have the following advantages:
  • the OQAM symbols on each subband are respectively mapped to the respective subcarriers to obtain a frequency domain signal, where phases in the same subband are obtained.
  • the interval is a fractional multiple of the first frequency interval, and then the frequency domain signal is generated for the FBMC signal, and finally the FBMC signal is sent to the receiver.
  • the second frequency interval is the first frequency interval between adjacent subcarriers in the same subband.
  • the sum of the frequency interval and the guard band interval, the guard band interval can effectively isolate the sub-carriers of the adjacent sub-bands, and the spectrum of the adjacent sub-bands of the guard band interval can be non-overlapping to achieve approximately orthogonality, so the guard band The interval may eliminate mutual interference caused by adjacent subbands due to different channels, and since the guard band interval is a fractional multiple of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, the fraction The multiple guard band spacing reduces the occupation of spectrum resources.
  • FIG. 1 is a schematic block diagram of a method for transmitting an FBMC signal according to an embodiment of the present invention; a schematic diagram of an implementation manner of an interval; and a schematic diagram of an implementation manner for eliminating mutual interference after an interval and before inserting a guard band interval; A schematic block diagram of a method for receiving an FBMC signal according to an embodiment of the present invention;
  • FIG. 4A is a schematic diagram of time domain characteristics of a filter according to an embodiment of the present invention.
  • FIG. 4B is a schematic diagram of spectral domain characteristics of a filter according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of a method for transmitting a FBMC signal implemented by a transmitter according to an embodiment of the present invention
  • FIG. 6 is a schematic diagram of an application scenario of inserting a guard band interval between adjacent subbands according to an embodiment of the present invention
  • FIG. 7 is a schematic diagram of a method for receiving an FBMC signal implemented by a receiver according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of another method for receiving a FBMC signal implemented by a receiver according to an embodiment of the present invention
  • 9-A is a schematic structural diagram of a transmitter according to an embodiment of the present invention.
  • 9-B is a schematic structural diagram of another transmitter according to an embodiment of the present invention.
  • 9-C is a schematic structural diagram of another transmitter according to an embodiment of the present invention.
  • FIG. 9-D is a schematic structural diagram of a signal generating module according to an embodiment of the present invention.
  • FIG. 10-A is a schematic structural diagram of a receiver according to an embodiment of the present invention.
  • FIG. 10-B is a schematic structural diagram of another receiver according to an embodiment of the present invention
  • FIG. 10-C is a schematic structural diagram of another receiver according to an embodiment of the present invention
  • FIG. 10-D is an implementation of the present invention
  • FIG. 10-E is a schematic structural diagram of another receiver according to an embodiment of the present invention
  • FIG. 10-F is a signal inverse mapping provided by an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram of another transmitter according to an embodiment of the present invention.
  • FIG. 12 is a schematic structural diagram of another receiver according to an embodiment of the present invention. detailed description
  • the embodiment of the invention provides a method for transmitting FBMC signals, a receiving method, a transmitter and a receiver, which can effectively eliminate mutual interference of frequency domain boundaries.
  • the first column represents the subcarrier number and the first row represents the number of the FBMC signal.
  • the coefficients in Table 1 except the first row and the first column indicate the coefficients of the received signals generated by the signals transmitted by the center position (i.e., subcarrier 0 and signal 0) at the corresponding subcarriers and signal positions. For example, if the signal transmitted at the center position is the subcarrier i and the coefficient of the position of the signal j is ⁇ 3 ⁇ 4, a receiving signal x ⁇ will be generated at the position of the subcarrier i and the signal j during the transmission of ⁇ ). . If no measures are taken, this received signal ⁇ will interfere with the reception of the wanted signal transmitted at the subcarrier i, signal j position, which is usually an inherent characteristic of the FBMC signal.
  • the transmitted signal is a pure real number or a pure imaginary number, and is mapped on the time-frequency resource element by the law of alternating real numbers and imaginary numbers.
  • the interference coefficient table of Table 1 above mutual interference always appears on the imaginary or real part opposite to the transmitted signal. Therefore, if the channel is invariant in the time-frequency range shown in Table 1, after the channel equalization is performed, the interference can be eliminated by a simple operation of the real imaginary part separation. For example, assume that the OQAM symbol transmitted at the (subcarrier 0, signal 0) position in Table 1 is a pure real symbol.
  • the OQAM symbol transmitted at the position of (subcarrier 0, signal 1) is a pure imaginary number, denoted as 1) .
  • ( 1) interference as an example, interference at other locations is temporarily ignored, and interference at other locations can be analyzed in the same way.
  • the interference signal. ⁇ 0.5644 is purely real, and the target reception signal ⁇ (() 1) ⁇ pure imaginary, by summing) the imaginary part of the interference signal can be completely eliminated.
  • a method for transmitting a filter bank multi-carrier (English full name Filter Bank Multi-Carrier, FBMC for short) signal may specifically include the following steps:
  • a subband (English full name subband) refers to a frequency resource composed of a plurality of consecutive subcarriers.
  • a plurality of OQAM symbols generated by the transmitter are carried on the respective sub-bands.
  • the transmitter when the OQAM symbols generated by the transmitter are used for uplink transmission, signals of different users go through different channels and arrive at the receiver. From the perspective of the receiver, At the critical position of the user's time-frequency resource, the channel is also not constant, so interference will also occur. At the receiver, mutual interference will also occur on several subcarriers adjacent to the two data blocks. Therefore, in order to avoid mutual interference between different users, optionally, in some embodiments of the present invention, the transmitter generates OQAM symbols carried on the same sub-band for the same user, that is, the transmitter generates a user-generated OQAM symbol. It is carried on a sub-band and is carried on different sub-bands for OQAM symbols that are not generated by the user.
  • the second frequency interval is a sum of the first frequency interval and the guard band interval, and the guard band interval is a fractional multiple of the first frequency interval.
  • the transmitter after the transmitter generates the OQAM symbol, the transmitter performs subcarrier mapping on the OQAM symbol, and the transmitter maps the OQAM symbols on each subband to each subcarrier respectively, and after the mapping is completed, each subcarrier A fixed interval is maintained, that is, as long as there is an interval between adjacent two subcarriers (also referred to as subcarrier spacing), and there is a first frequency between adjacent subcarriers in the same subband.
  • a second frequency interval exists between adjacent subcarriers between two adjacent subbands, and since the second frequency interval is a sum of the first frequency interval and the guard band interval, in the embodiment of the present invention, for the same sub
  • the first frequency interval between adjacent subcarriers in the band is smaller than the second frequency interval between adjacent subcarriers between adjacent two subbands, and numerically, the second frequency interval is subtracted from the first The frequency interval is equal to the guard band interval.
  • step 102 mapping the OQAM symbols on each subband to each subcarrier separately may include two situations: one is to map the OQAM symbols on the same subband to the subcarriers, The other is to map the OQAM symbols carried on the adjacent subbands onto the subcarriers. Specifically, for the OQAM symbols that belong to the same subband, step 102 maps the OQAM symbols on each subband to each subcarrier, and may include the following steps:
  • the yth subcarrier and the (y+1)th subcarrier have a first frequency interval ⁇
  • the X refers to any one of the at least two sub-bands
  • the ⁇ refers to any one of the OQAM symbols on the Xth sub-band
  • the OQAM symbols are two adjacent OQAM symbols on the xth subband, and the x, y, and n are all positive integers.
  • the transmitter may separately map all the OQAM symbols generated in step 101.
  • the sub-band of the subcarrier mapping performed by the transmitter is represented by X. If the OQAM symbol generated by the transmitter is carried on four sub-bands, Then, the value of X can be 1 or 2 or 3 or 4, and any OQAM symbol on the Xth subband is represented by n. If the transmitter carries 5 OQAM symbols on the Xth subband, then n The value may be 1 or 2 or 3, etc., (n+1) may represent an OQAM symbol adjacent to n, and y shall be used to represent a subcarrier to which the nth OQAM symbol on the Xth subband is mapped.
  • first mapping the first OQAM symbol on the first subband to the yth subcarrier, and then the first subband.
  • the second OQAM symbol is mapped onto the (y+1)th subcarrier, ... until the 5th OQAM symbol on the 1st subband is mapped to the (y+4)th subcarrier.
  • Subcarrier mapping is performed on OQAM symbols belonging to the same subband according to the manner described above, and adjacent subcarriers in the same subband have the same interval value, and the interval value is a first frequency interval, which can be represented by ⁇ .
  • mapping the nth OQAM symbol on the Xth subband to the yth subcarrier and mapping the (n+1)th OQAM symbol on the Xth subband to After the (y+1)th subcarrier, in the frequency domain, the first frequency interval ⁇ between the yth subcarrier and the (y+1)th subcarrier is implemented as follows:
  • the transmitter when the transmitter performs subcarrier mapping, for the case where the OQAM symbols belonging to the same subband are respectively mapped to the subcarriers, the adjacent subcarriers (ie, the yth subcarrier and the (y+1)th subcarrier)
  • the first frequency interval between the two is achieved by inserting (k - 1 ) 0 between the nth OQAM symbol and the (n+1)th OQAM symbol, where k is the prototype filter set by the transmitter The overlap factor.
  • the step 102 maps the OQAM symbols on each sub-band to the respective sub-carriers, which may include the following steps: Mapping the last OQAM symbol on the xth subband to the zth subcarrier; mapping the first OQAM symbol on the (x+1)th subband to the (z+1)th subcarrier; Between the zth subcarrier and the (z+1)th subcarrier, there is a second frequency interval (m+1) A, the ⁇ / represents the first frequency interval, and the m A is a guard band interval.
  • the m is a fraction greater than 0, and the x and z are all positive integers.
  • the transmitter may separately map all the OQAM symbols generated in step 101.
  • the sub-band of the subcarrier mapping performed by the transmitter is represented by X. If the OQAM symbol generated by the transmitter is carried on four sub-bands, Then, the value of X may be 1 or 2 or 3.
  • the subband adjacent to X is represented by (x+1), and if the last OQAM symbol on the Xth subband is mapped to the zth subcarrier, The first OQAM symbol on the (x+1)th subband adjacent to the Xth subband can be mapped onto the (z+1)th subcarrier.
  • the implementation scenarios of the OQAM symbols belonging to the two subbands are as follows: The fifth on the first subband The OQAM symbol is mapped onto the zth subcarrier, and then the first OQAM symbol on the second subband is mapped onto the z+1th subcarrier.
  • the subcarrier mapping is performed on the OQAM symbols belonging to the two subbands in the manner described above, and the adjacent subcarriers belonging to the two subbands have the same interval value, and the interval value is the second frequency interval, which can be used ( m+ l)A indicates that m represents a fraction greater than 0, and m A can represent the guard band interval.
  • mapping the last OQAM symbol on the Xth subband to the zth subcarrier and mapping the first OQAM symbol on the (x+1)th subband to the first After (z+1) subcarriers, from the frequency domain, the second frequency interval (m+1) ⁇ between the zth subcarrier and the (z+1)th subcarrier is implemented as follows:
  • k is the overlap factor of the prototype filter
  • p is the out-of-band rejection factor of the prototype filter
  • the adjacent subcarriers ie, the zth subcarrier and the (z+1)th subcarrier
  • the second frequency interval between ( ) is inserted by (k + p - 1 ) between the last OQAM symbol on the Xth subband and the first OQAM symbol on the (x+1)th subband Implemented by 0, where k is the overlap factor of the prototype filter set by the transmitter, and p is the prototype filter Out-of-band inhibition factor.
  • the out-of-band rejection factor is a parameter reflecting the out-of-band suppression effect of the prototype filter.
  • the method for determining the out-of-band rejection factor is: if (k+p-1) 0s are inserted between two adjacent OQAM symbols, and after frequency domain filtering, the energy of the spectrum of the adjacent two OQAM symbols is mainly If part of the overlap does not occur, then p is considered to be a reasonable out-of-band inhibitor.
  • a first frequency interval between adjacent subcarriers in the same subband and a second frequency interval between adjacent subcarriers between adjacent two subbands may also be as follows The method is implemented by: first inserting a first frequency interval between all adjacent subcarriers, that is, inserting a first frequency interval between the same subband or between two subbands, and then subdividing into two sub-intervals The adjacent subcarriers between the bands are reinserted into the guard band interval, so the guard band interval plus the first frequency interval can obtain the second frequency interval.
  • the transmitter maps all OQAM symbols to respective subcarriers, all adjacent subcarriers have a first frequency interval, and then the transmitter is adjacent between adjacent subbands in the FBMC signal.
  • the guard band interval is further inserted between the subcarriers, wherein the guard band interval is an interval value that is a fractional multiple of the first frequency interval, and the interval value is used to protect the OQAM symbols on the adjacent two subbands.
  • Mutual interference Since the transmitter inserts a guard band interval between different sub-bands, the guard band interval can effectively isolate adjacent sub-bands, and the spectrum of adjacent sub-bands in the guard band interval can be non-overlapping to achieve approximately orthogonality.
  • the guard band interval can eliminate mutual interference caused by adjacent subbands due to different channels, and since the guard band interval is a multiple of the first frequency interval, and does not exceed one complete adjacent subcarrier interval, Therefore, the guard band interval of the fractional multiple reduces the occupation of spectrum resources.
  • the last OQAM symbol of the Xth subband is mapped to the zth subcarrier
  • the first OQAM symbol of the (x+1)th subband is mapped to the (z+1)th subcarrier, which belongs to two Insert ⁇ between the zth subcarrier and the (z+1)th subcarrier of each subband, and then insert ⁇ ⁇ / ⁇ between the second subcarrier and the (z+1)th subcarrier, where ⁇ ⁇
  • m is a fraction greater than zero.
  • the guard band interval inserted by the transmitter in the embodiment of the present invention is m ⁇
  • m is a score greater than 0. Value.
  • FIG. 2 A schematic diagram of an implementation of guard band spacing, in which the Xth subband and the (x+1)th subband are continuously distributed in the time domain (t), and the Xth subband and the (x+) in the frequency domain (f) 1)
  • a guard band interval is inserted between the sub-bands. It can be seen that the guard band interval inserted between different sub-bands can effectively isolate the adjacent sub-bands, so the guard band interval can be different for adjacent sub-bands. The mutual interference generated by the channel is eliminated.
  • the guard band interval is a fractional multiple of the first frequency interval, where the fractional multiple refers to a score greater than 0, and the fractional multiple is also considered to be a pure fraction.
  • the value of the guard band interval is a multiple of the first frequency interval. In practical applications, there are multiple ways to obtain the guard band interval. Specifically, in some embodiments of the present invention, in some embodiments of the present invention, in some embodiments of the present invention, the method for transmitting the FBMC signal provided by the embodiment of the present invention may further include the following steps:
  • guard band interval Obtaining the guard band interval according to an overlap factor and an outband suppression factor of the prototype filter and the first frequency interval, where the guard band interval is obtained by:
  • the G is the guard band interval
  • the overlap factor of the prototype filter the P is an out-of-band rejection factor of the prototype filter
  • the ⁇ is the first frequency interval.
  • the transmitter is equipped with a filter, and the transmitter can determine the value of the guard band interval according to the overlap factor of the prototype filter and the out-of-band rejection factor and the first frequency interval, wherein the value of the overlap factor It is determined by the filter provided by the transmitter that the out-of-band suppression factor refers to the degree of suppression of the signal by the filter beyond the passband, and the transmitter can use the relevant parameters of the filter to determine the value of the guard band interval, in the embodiment of the present invention.
  • the transmitter can set the guard band interval to the first frequency interval. For example, the transmitter can preset a fractional value as the guard band interval. When the transmitter maps all OQAM symbols to each sub-band. After the carrier is on, the preset guard band interval can be inserted between adjacent subcarriers of adjacent subbands.
  • a first frequency interval (which may be referred to as a subcarrier interval, such as ⁇ ) between adjacent subcarriers in the same subband is fixed.
  • a guard band interval (which may also be simply referred to as a guard interval) is inserted between adjacent subbands, and the guard interval (G) is a fractional subcarrier interval, G f , where K is a positive integer and P is a non-negative Integer. That is, after the guard interval is inserted, the adjacent subcarrier spacing of two adjacent subbands becomes
  • FIG. 2-B is a schematic diagram of the implementation of canceling mutual interference after inserting the guard band interval and before inserting the guard band interval.
  • the spectrum for the sub-band 1 is indicated by the solid line
  • the spectrum of the sub-band 2 is indicated by the dashed line
  • FIG. 2 The left half of -B is the spectrum overlap diagram of the interference between subband 1 and subband 2 before the insertion of the guard band interval
  • the right half of Fig. 2-B is the non-overlapping spectrum of the interference after the interference is removed after the guard band interval is inserted.
  • the guard interval can only be an integer multiple of subcarrier spacing (eg, 1 or 2 subcarrier spacing), but implemented in accordance with the present invention.
  • the guard interval may be only a fractional subcarrier spacing (for example, 3/4 subcarrier spacing). Therefore, the guard band interval of the fractional multiple reduces the occupation of spectrum resources.
  • the frequency domain signal has the first frequency between adjacent subcarriers in the same subband.
  • the interval has a second frequency interval between adjacent subcarriers between two adjacent subbands.
  • step 103 generates a FBMC signal by using a frequency domain signal, which may include the following steps:
  • A2 performing inverse Fourier transform (inverse Discrete Fourier Transform, English abbreviation IDFT) on the frequency domain filtered frequency domain signal to obtain a time domain signal;
  • inverse Fourier transform inverse Discrete Fourier Transform, English abbreviation IDFT
  • A3. Perform time domain misalignment superposition on the time domain signal to obtain the FBMC signal.
  • the transmitter performs frequency domain filtering on the frequency domain signal to obtain a frequency domain filtered frequency domain signal.
  • the OQAM symbols carried on the plurality of subbands constitute an FBMC signal, and each FBMC signal includes an OQAM symbol carried on the plurality of subbands.
  • the camera performs frequency domain filtering on the frequency domain signal, which can be implemented by a filter configured in the transmitter.
  • the step A1 performs frequency domain filtering on the frequency domain signal, and specifically includes the following steps:
  • the frequency domain signal is convoluted with the frequency domain response of the filter configured in the transmitter to obtain a frequency domain filtered frequency domain signal.
  • the method for transmitting the FBMC signal may further include the following steps:
  • the frequency domain signal is precoded.
  • the receiver can perform signal detection by performing a pre-processing, that is, pre-coding on the transmitted signal.
  • one of the typical scenarios applicable to the FBMC signal is in a multiple input multiple output-filter Bank Multi Carrier (MIMO-FBMC) system.
  • MIMO-FBMC Multiple input multiple output-filter Bank Multi Carrier
  • the channel will become the equivalent channel, which can be represented by the product of the channel and the precoding matrix. Since the precoding is usually performed at a certain time-frequency granularity, the equivalent channel may not be constant near the frequency domain boundary of the different precoding code blocks.
  • the transmitter has a second frequency interval between adjacent subcarriers between two adjacent subbands, and the second frequency interval is composed of a first frequency interval and a guard band interval.
  • the guard band spacing can eliminate the mutual interference caused by the adjacent two sub-bands due to different channels.
  • step A2 after the transmitter performs frequency domain filtering on the frequency domain signal, the transmitter performs IDFT on the frequency domain filtered frequency domain signal to obtain a time domain signal. Further, when the value of the overlap factor of the prototype filter is an integer power of 2, the transmitter of step A2 performs IDFT on the frequency domain filtered frequency domain signal, which may include the following steps:
  • the frequency domain filtered frequency domain signal is subjected to fast inverse Fourier transform (English full name Inverse Fast Fourier Transform, English abbreviation IFFT) to obtain a time domain signal.
  • fast inverse Fourier transform English full name Inverse Fast Fourier Transform, English abbreviation IFFT
  • IFFT usually refers to the fast Fourier transform with a base of 2
  • IFFT it is also possible to add 0 to the frequency domain signal to satisfy the integer power of 2. It is required that IFFT can also be performed in this case.
  • step A3 after the transmitter performs IDFT on the frequency domain signal, the transmitter superimposes the time domain signal in the time domain to obtain the FBMC signal, which needs to be sent by the transmitter to the receiver. Further, step A3 may specifically include the following steps:
  • Time domain misalignment is performed on the time domain signal according to the offset interval T/2K, where T is the data length of a FBMC time domain signal, and K is the overlap factor of the prototype filter;
  • the time domain signals after the misalignment are superimposed to obtain the FBMC signal.
  • the misalignment interval can be T/2K.
  • the transmitter can also flexibly set the value of the misalignment interval according to the specific application scenario. After all the time domain signals are misaligned, the transmitter superimposes the time domain signals after the misalignment to obtain the FBMC signals superposed by the time domain misalignment.
  • the transmitter After the transmitter completes the misalignment of the FBMC signal, the transmitter will
  • the FBMC signal is sent to the receiver, which is received and parsed by the receiver.
  • the transmitter may specifically be a terminal, and the receiver may specifically be a base station, that is, the terminal sends the generated FBMC signal to the base station, and in addition, for the processing process of the downlink FBMC signal,
  • the transmitter may be a base station, and the receiver may be a terminal, that is, the base station sends the generated FBMC signal to the terminal.
  • the OQAM symbols on each subband are respectively mapped to the respective subcarriers to obtain a frequency domain signal, where the same sub There is a first frequency interval between adjacent subcarriers in the band, and a second frequency interval between adjacent subcarriers between adjacent two subbands, and the second frequency interval is a sum of the first frequency interval and the guard band interval And the guard band interval is a fractional multiple of the first frequency interval, then the frequency domain signal is generated for the FBMC signal, and finally the FBMC signal is sent to the receiver.
  • the second frequency interval is the first frequency interval between adjacent subcarriers in the same subband.
  • the sum of a frequency interval and a guard band interval, the guard band interval can effectively isolate the sub-carriers of adjacent sub-bands, and the spectrum of adjacent sub-bands of the guard band interval can be non-overlapping to achieve approximately orthogonality, so protection
  • the frequency band interval can eliminate mutual interference caused by adjacent sub-bands due to different channels, and since the guard band interval is a fractional multiple of the first frequency interval, and does not exceed one complete adjacent sub-carrier interval, Multiple times the guard band spacing reduces the occupation of spectrum resources.
  • the above embodiment describes the method for transmitting the FBMC signal provided by the embodiment of the present invention from the transmitter side.
  • the method for receiving the FBMC signal provided by the embodiment of the present invention is introduced, which is implemented by the receiver, as shown in FIG.
  • the indication may mainly include the following steps:
  • the receiver can normally receive the FBMC signal.
  • the receiver after receiving the FBMC signal, the receiver obtains the frequency domain signal by using the received FBMC signal.
  • the receiving, by the receiver, the frequency domain signal by using the received FBMC signal may include the following steps:
  • step Bl the receiver first performs time domain symbol extraction on the received FBMC signal to obtain a time domain signal. Further, step B1 performs time domain symbol extraction on the received FBMC signal to obtain a time domain signal, which may specifically include the following steps:
  • Time domain symbol extraction is performed on the received FBMC signal according to a misalignment interval T/2K, where T is the data length of the time domain signal and K is the overlap factor of the prototype filter.
  • the receiver when the receiver performs time domain symbol extraction on the FBMC signal transmitted by the transmitter, the receiver can extract according to the misalignment interval set by the transmitter, and then there are T/2K delays between the extracted two FBMC signals.
  • the receiver performs DFT on the time domain signal extracted by the time domain symbol to obtain a signal after the DFT, so as to realize the restoration of the FBMC signal from the time domain to the frequency domain.
  • the step B2 when the value of the overlap factor is an integer power of 2, the step B2 performs DFT on the time domain signal obtained by extracting the time domain symbol, and may specifically include the following Steps:
  • the fast Fourier transform (English full name Fast Fourier Transform, FFT for short) is performed on the time domain signal extracted from the time domain symbol.
  • the FFT usually refers to the fast Fourier transform with a base of 2, if the value of the overlap factor is not the integer power of 2, if the transmitter adds 0 to the FBMC frequency domain signal to satisfy the integer power of 2.
  • the IFFT is used in the request, and in this case the receiver can also perform the same number of FFTs as the transmitter's IFFT.
  • the receiver after the receiver performs DFT on the FBMC signal, the receiver also needs to perform frequency domain filtering on the FBMC signal after the DFT to obtain a frequency domain signal, where the frequency domain filtering may specifically pass through the receiver.
  • the configured filter is implemented.
  • step B3 performs frequency domain filtering on the signal after the DFT to obtain a frequency domain signal, which may include the following steps:
  • the signal after the DFT is convoluted with the conjugate of the frequency response of the filter provided by the transmitter to obtain a frequency domain signal.
  • the filter provided by the receiver and the filter provided by the transmitter are mutually conjugated in coefficients, and the frequency domain filter can be generated by the receiver through the frequency domain filtering of the filter.
  • the step B3 performs frequency domain filtering on the signal after the DFT to obtain the frequency domain signal.
  • the receiving method of the FBMC signal provided by the embodiment of the present invention may further include the following steps:
  • Channel equalization is performed on the signal after DFT.
  • the equalizer can be implemented by an equalizer configured in the receiver.
  • the equalizer acts as a tunable filter to correct and compensate for channel fading and reduce the influence of inter-symbol interference.
  • performing channel equalization on the signal after the DFT may specifically include the following steps: multiplying the signal after the DFT and the coefficients of the equalizer to obtain a time-domain signal after channel equalization, where the coefficient of the equalizer is a receiver The reciprocal of the channel frequency response.
  • 303 Perform inverse mapping on the frequency domain signal according to the first frequency interval and the second frequency interval, to obtain orthogonal amplitude modulated OQAM symbols carried on at least two subbands, where the first frequency interval is adjacent subcarriers in the same subband. There is a frequency interval between the two, and the second frequency interval is a frequency interval between adjacent subcarriers between adjacent two subbands.
  • the second frequency interval is a sum of the first frequency interval and the guard band interval, and between the guard bands The interval is a fractional multiple of the first frequency interval.
  • the method for transmitting the FBMC signal may further include The following steps:
  • the step 303 performs inverse mapping on the frequency domain signal according to the first frequency interval and the second frequency interval, and specifically includes the following steps:
  • the frequency domain signals mapped on the preset subcarriers are inversely mapped according to the first frequency interval and the second frequency interval.
  • the downlink FBMC signal sent by the transmitter may not be transmitted only to one user, and the receiver obtains the frequency domain by using the received FBMC signal.
  • the receiver can perform inverse mapping only on one or some specific subcarriers, and does not need to perform inverse mapping on all subcarriers. For example, if the transmitter performs downlink signal transmission, it receives The machine only needs to extract the data scheduled to its own subcarriers, and does not need to perform subsequent processing on the data on all subcarriers. If the transmitter performs uplink signal transmission, the receiver needs to extract all useful subcarriers. The data on it is processed later. Specifically, the receiver can filter the frequency domain signal, and filter the frequency domain signals mapped on the preset subcarriers from all the frequency domain signals.
  • the receiver inversely maps the frequency domain signal according to the mapping of the transmitter, that is, the receiver can extract data from the frequency domain signal according to the first frequency interval and the second frequency interval, as an inverse mapping. the result of. Since the transmitter uses two intervals for mapping the frequency domain signals (ie, the first frequency interval for adjacent subcarriers in the same subband and the adjacent subcarriers between adjacent two subbands) The second frequency interval is used;), then the receiver can extract data according to the first frequency interval and the second frequency when performing signal restoration to obtain an OQAM signal carried on at least two sub-bands.
  • the receiver when performing inverse mapping, may take out OQAM symbols according to the first frequency interval for adjacent subcarriers in each subband, and transmit for adjacent subcarriers belonging to the two subbands.
  • the second frequency interval is inserted between adjacent subcarriers belonging to the two subbands, and the second frequency interval is after the first frequency interval and the guard band interval, then the receiver also needs to follow the inverse mapping.
  • the second frequency interval inserted by the transmitter restores the OQAM symbol.
  • the guard sub-band is inserted into the adjacent sub-carrier between the adjacent two sub-bands, and the guard band interval can effectively isolate the adjacent two sub-bands, and the adjacent two sub-bands can be realized by the guard band interval.
  • the bands of the bands do not overlap so as to be approximately orthogonal, so the guard band interval can eliminate the mutual interference caused by the adjacent two sub-bands due to the different channels, and since the guard band interval is a fraction of the first frequency interval There is no more than one complete adjacent subcarrier spacing, so the fractional guard band spacing reduces the occupation of spectrum resources.
  • step 303 inversely maps the frequency domain signal according to the first frequency interval and the second frequency interval to obtain a quadrature amplitude modulated OQAM symbol carried on at least two subbands, and the present invention
  • the receiving method of the FBMC signal provided by the embodiment may further include the following steps:
  • Channel equalization is performed on OQAM symbols.
  • the equalizer can be implemented by an equalizer configured in the receiver.
  • the equalizer acts as a tunable filter to correct and compensate for channel fading and reduce the influence of inter-symbol interference.
  • performing channel equalization on the OQAM symbol may include the following steps:
  • the OQAM symbol is multiplied by the equalizer coefficients to obtain a channel-equalized OQAM symbol, wherein the equalizer coefficient is the reciprocal of the receiver's channel frequency response.
  • the channel equalization of the FBMC signal by the receiver in the embodiment of the present invention may be completed before the frequency domain filtering, or may be performed after the inverse mapping of the frequency domain signal according to the first frequency interval and the second frequency interval.
  • the completion may depend on the specific application scenario.
  • step 303 inversely maps the frequency domain signal according to the first frequency interval and the second frequency interval to obtain a quadrature amplitude modulation OQAM symbol carried on the at least two subbands, which may specifically include the following steps. :
  • the X refers to any one of the frequency domain signals.
  • the first subcarrier of the Xth subband and the last subcarrier of the (x-1)th subband are adjacent subcarriers belonging to two subbands, and the interval is the second frequency interval. Therefore, the first OQAM symbol carried on the Xth subband can be extracted from the Xth subband of the frequency domain signal according to the second frequency interval.
  • the second subcarrier of the Xth subband and the third subcarrier of the Xth subband are separated by a first frequency interval, and for the third subcarrier and the Xth subband of the Xth subband The four subcarriers are separated by a first frequency interval, so that the second OQAM symbol carried on the Xth subband can be extracted from the Xth subband of the frequency domain signal according to the first frequency interval until the last OQAM symbol
  • the first subcarrier of the (x+1)th subband and the last subcarrier of the Xth subband are adjacent subcarriers belonging to two subbands, and the interval is the second frequency interval, so The first OQAM symbol carried on the (x+1)th subband can be extracted from the (x+1)th subband of the frequency domain signal according to the second frequency interval.
  • the complete OQAM symbol can be extracted from the frequency domain signal by the above description.
  • the description of the present invention by the above embodiment shows that after receiving the FBMC signal from the transmitter, the receiver obtains the frequency domain signal from the received FBMC signal, and finally inversely maps the frequency domain signal according to the first frequency interval and the second frequency interval.
  • the interval, the second frequency interval is a sum of the first frequency interval and the guard band interval
  • the guard band interval is a fraction of the first frequency interval.
  • the receiver Since the transmitter forms a second frequency interval between adjacent subcarriers of two adjacent subbands, and a first frequency interval is formed between adjacent subcarriers of the same subband, the receiver needs to be based on the first frequency.
  • the interval and the second frequency interval inversely map the frequency domain signal to restore the OQAM symbol generated by the transmitter.
  • the second frequency interval is a sum of the first frequency interval and the guard band interval
  • the guard band interval may perform subcarriers of adjacent subbands Effective isolation, by guarding the frequency band interval adjacent sub-band spectrum can achieve non-overlapping to achieve approximately orthogonal, so the guard band interval can eliminate mutual interference caused by adjacent sub-bands due to different channels, and due to protection
  • the band spacing is a fraction of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, so a fractional guard band spacing reduces the occupation of spectrum resources.
  • embodiments of the present invention may configure filtering that satisfies the following requirements Wave:
  • the prototype filter has a narrow frequency domain transition band, wherein the transition band refers to the spectrum interval from the center of the filter frequency domain response to the frequency domain response close to 0, and the index for judging whether it is close to 0 is Whether the transmission performance is greatly affected, for example, the frequency domain response of less than -30 dB can be considered to be close to 0, because the signal to interference and noise ratio of the wireless communication system is usually below 30 dB.
  • the prototype filter has good real-domain orthogonality under OQAM modulation.
  • the filter can be implemented by some existing filter design and optimization techniques, as shown in FIG. 4-A and FIG. 4-B, which are schematic diagrams of time domain and frequency spectrum characteristics of the filter provided by the embodiment of the present invention.
  • FIG. 4-A and FIG. 4-B are schematic diagrams of time domain and frequency spectrum characteristics of the filter provided by the embodiment of the present invention.
  • FIG. 5 it is a schematic diagram of a method for transmitting a FBMC signal implemented by a transmitter according to an embodiment of the present invention, which mainly includes the following steps:
  • the aliasing factor of the prototype filter equipped in the transmitter is ⁇ , and the number of subcarriers in the frequency domain is ⁇ .
  • the specific implementation of the transmitter is as follows:
  • the generated OQAM symbol contains L subbands, where L is greater than or equal to 2.
  • n represents the number of the FBMC signal
  • N represents the total number of useful subcarriers, which is not numerically greater than the total number of subcarriers M
  • ⁇ z represents the zth subcarrier of the i th subband for generating the nth FBMC signal.
  • the role of the subcarrier mapping is to map the OQAM symbols on the L subbands onto the subcarriers (using vector to represent the data on all subcarriers after mapping), assuming that the original interval ⁇ between the two subcarriers is 1 interval. Unit, and insert a fractional guard band interval between subbands.
  • mapping rules performed by the transmitter are as follows:
  • the frequency interval between the last subcarrier of the previous subband and the first subcarrier of the latter subband is K+P, where P Is a non-negative integer. That is, if the last subcarrier of the i-th subband is mapped to , the subcarrier No. 0 of the i+1th subband is mapped to upper.
  • FIG. 6 is a schematic diagram of an application scenario in which a guard band interval is inserted between adjacent sub-bands according to an embodiment of the present invention, FIG. 6
  • the subcarrier mapping results of the critical positions of subband i and subband i+1 are given, in which K-1 zeros are inserted between two adjacent subcarriers in the same subband, and in two Between subbands, K+P-1 zeros are inserted.
  • the function of the frequency domain filtering is to filter the frequency of the mapped data block.
  • the implementation of frequency domain filtering can be achieved by convolving 3 ⁇ 4 with the filter frequency response , ie
  • is a convolutional operator
  • fi is the frequency response of the prototype filter
  • its length is usually KM, but for a filter with better frequency domain locality, the coefficient with less power can also be truncated. Make it less than KM in length, thus reducing computational complexity.
  • T is a value not less than KM, ie ⁇ ⁇ . If ⁇ is greater than ⁇ , you can insert 0 to make up the ⁇ point on both sides ofenfin, and then do IDFT . Obviously, the IDFT transformed length is T samples.
  • an inverse fast Fourier transform of 2 i.e., an IFFT transform
  • the T point data corresponding to the n+1th real symbol is delayed by T/2K point than the T point data corresponding to the nth real symbol, and all the real symbols are misplaced and then superimposed.
  • the parallel data becomes a serial data stream, and the transmitter transmits the FBMC signal to the receiver.
  • the receiver there may be two methods for receiving the FBMC signal, the main difference being the position of the equalizer, as shown in FIG. 7, which is the FBMC letter implemented by the receiver in the embodiment of the present invention.
  • the schematic diagram of the receiving method of the number mainly includes the following steps:
  • the time domain symbol of the nth FBMC signal is extracted, and it is obtained that e n is a vector of length T.coast
  • the T point data of +1 is delayed by T/2K point than the T point data of ⁇ .
  • the equalizer coefficients are:
  • Frequency domain filtering is a matched filtering operation of the transmitter's frequency domain filtering, which can be achieved by convolution.
  • the inverse mapping of the subcarriers corresponds to the subcarrier mapping module of the transmitter. After inverse mapping, get the transmitted data with the sender, a n 2 , ..., corresponding to the data to be detected? , ? composer 2 , ising, , where is the corresponding value to be detected, and there is a noise vector. As shown in Figure 7, after the receiver performs inverse mapping, the output result, q , .. . subcarrier inverse mapping is the transmitted sub- The inverse of carrier mapping, the specific method is:
  • a value is taken every K positions to be the result of the inverse mapping. For example: If inversely mapped, ⁇ is inversely mapped to +1 , where the first element is the jth element of ⁇ undomap.
  • the receiver only needs to extract the data on the subcarriers scheduled for itself, and does not need to perform subsequent processing on the data on all subcarriers.
  • the receiver needs to extract data on all useful subcarriers for subsequent processing.
  • OQAM data demodulation may also be performed.
  • OQAM data demodulation may also be performed.
  • FIG. 8 is a schematic diagram of another method for receiving a FBMC signal implemented by a receiver in an embodiment of the present invention
  • the equalizer is transferred to the subcarrier mapping.
  • S3 the implementation method of equalization
  • the difference is that the KM data needs to be balanced at most in Figure 7, and in Figure 8, only M data needs to be equalized.
  • a guard band interval is inserted between different subbands of the FBMC system to eliminate interference between adjacent subbands.
  • the guard band interval can achieve a fractional subcarrier spacing width, which saves frequency resources.
  • a transmitter 900 may include: a symbol generating module 901, a symbol mapping module 902, a signal generating module 903, and a sending module 904, where the symbol generating module 901, Generating an offset quadrature amplitude modulation OQAM symbol included on at least two subbands;
  • the symbol mapping module 902 is configured to map the OQAM symbols on each subband to each subcarrier to obtain a frequency domain signal, where adjacent subcarriers in the same subband have a first frequency interval, and adjacent two a second frequency interval between adjacent subcarriers between the subbands, the second frequency interval being a sum of the first frequency interval and the guard band interval, and the guard band interval is a fraction of the first frequency interval ;
  • a signal generating module 903, configured to generate the FBMC signal by using the frequency domain signal
  • the sending module 904 is configured to send the FBMC signal to the receiver.
  • the symbol mapping module 902 is specifically configured to map the nth OQAM symbol on the Xth subband to the yth subcarrier;
  • the (n+1)th OQAM symbol on the Xth subband is mapped onto the (y+1)th subcarrier;
  • the first y subcarrier and the (y+1)th subcarrier have a first frequency interval ⁇ , and the X refers to any one of the at least two subbands, and the ⁇ Refers to any one of the OQAM symbols on the Xth subband, the nth OQAM symbol and the (n+1)th OQAM symbol are two adjacent OQAM symbols on the Xth subband, the x , y, n are positive integers.
  • mapping the nth OQAM symbol on the Xth subband to the yth subcarrier and mapping the (n+1)th OQAM symbol on the Xth subband to the (y+1)th sub-carrier is implemented by:
  • the symbol mapping module 902 is specifically configured to map the last OQAM symbol on the Xth subband to the zth subcarrier;
  • the first OQAM symbol on (x+1) subbands is mapped onto the (z+1)th subcarrier;
  • the zth subcarrier and the (z+1)th subcarrier have a second frequency interval (m+1) A
  • the ⁇ / indicates the first frequency interval
  • the m A is protection Band spacing
  • the m is a fraction greater than 0
  • the x and z are both positive integers.
  • mapping the last OQAM symbol on the xth subband to the zth subcarrier and mapping the first OQAM symbol on the (x+1)th subband to the (z+1)th subcarrier is implemented by:
  • k is the overlap factor of the prototype filter
  • p is the out-of-band rejection factor of the prototype filter
  • the transmitter 900 further includes: a guard band interval acquiring module 905, where the guard band interval acquiring module 905 is configured to Before the symbol mapping module maps the OQAM symbols on each subband to the respective subcarriers, the guard band interval is obtained according to the overlap factor of the prototype filter and the outband suppression factor and the first frequency interval, where The guard band interval is as follows:
  • the G is the guard band interval
  • the overlap factor of the prototype filter the P is an out-of-band rejection factor of the prototype filter
  • the ⁇ is the first frequency interval.
  • the transmitter 900 in addition to the transmitter 900 shown in FIG. 9-A, further includes: a precoding module 906,
  • the signal generating module 903 pre-codes the OQAM symbols on each of the frequency domain signals before generating the FBMC signal by the frequency domain signal.
  • the symbol generating module 901 is specifically configured to generate OQAM symbols carried on the same subband for the same user.
  • the signal generating module 903 includes:
  • a filter 9031 configured to perform frequency domain filtering on the frequency domain signal
  • An inverse discrete Fourier transform module 9032 configured to perform an inverse discrete Fourier transform (IDFT) on the frequency domain filtered frequency domain signal to obtain a time domain signal;
  • IDFT inverse discrete Fourier transform
  • the misalignment superposition module 9033 is configured to perform time domain misalignment superposition on the time domain signal to obtain the FBMC signal.
  • the OQAM symbols on each subband are respectively mapped to the respective subcarriers to obtain a frequency domain signal, where the same sub There is a first frequency interval between adjacent subcarriers in the band, and a second frequency interval between adjacent subcarriers between adjacent two subbands, and the second frequency interval is a sum of the first frequency interval and the guard band interval And the guard band interval is a fractional multiple of the first frequency interval, then the frequency domain signal is generated for the FBMC signal, and finally the FBMC signal is sent to the receiver.
  • the second frequency interval is the first frequency interval between adjacent subcarriers in the same subband.
  • the sum of the frequency interval and the guard band interval, the guard band interval can effectively isolate the sub-carriers of the adjacent sub-bands, and the spectrum of the adjacent sub-bands of the guard band interval can be non-overlapping to achieve approximately orthogonality, so the guard band Intervals can eliminate mutual interference caused by adjacent subbands due to different channels, and since the guard band interval is a fraction of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, the fraction The multiple guard band spacing reduces the occupation of spectrum resources.
  • a receiver 1000 may include: a signal receiving module 1001, a frequency domain signal acquiring module 1002, and a signal inverse mapping module 1003, where the signal receiving module 1001 is used. Receiving an FBMC signal;
  • the frequency domain signal acquisition module 1002 is configured to obtain a frequency domain signal by using the received FBMC signal.
  • the signal inverse mapping module 1003 is configured to inversely map the frequency domain signal according to the first frequency interval and the second frequency interval to obtain a bearer. Orthogonal amplitude modulated OQAM symbols on at least two subbands, wherein the first frequency interval is a frequency interval between adjacent subcarriers in the same subband, and the second frequency interval is two adjacent subbands a frequency interval between adjacent subcarriers between the bands, the second frequency interval being a sum of the first frequency interval and the guard band interval, and the guard band interval is a fraction of the first frequency interval Several times.
  • the frequency domain signal acquisition module 1002 includes:
  • the time domain signal extraction sub-module 10021 is configured to perform time domain symbol extraction on the received FBMC signal to obtain a time domain signal.
  • a discrete Fourier transform sub-module 10022 configured to perform a discrete Fourier transform DFT on the time domain signal obtained by extracting the time domain symbols, to obtain a signal after the DFT;
  • the filter 10023 is configured to perform frequency domain filtering on the signal after the DFT to obtain the frequency domain signal. Further, as shown in FIG. 10-C, the frequency domain signal acquiring module 1002 further includes: a first equalizer 10024, configured to: after the filter 10023 performs frequency domain filtering on the DFT signal, after the DFT The signal is channel balanced.
  • the receiver 1000 if the received FBMC signal is a downlink signal, the receiver 1000, It can also include:
  • the frequency domain signal screening module 1004 is configured to: after the frequency domain signal acquiring module obtains the frequency domain signal by using the received FBMC signal, and screen the frequency domain signal mapped on the preset subcarrier from the frequency domain signal;
  • the signal inverse mapping module 1003 is specifically configured to inversely map the frequency domain signals mapped on the preset subcarriers according to the first frequency interval and the second frequency interval.
  • the receiver 1000 further includes: a second equalizer 1005 for the signal
  • the inverse mapping module 1003 inversely maps the frequency domain signal according to the first frequency interval and the second frequency interval, and obtains channel equalization of the OQAM symbol after obtaining the orthogonal amplitude modulated OQAM symbols carried on the at least two subbands.
  • the signal inverse mapping module 1003 may specifically include:
  • a first inverse mapping sub-module 10031 configured to extract, according to the second frequency interval, the first OQAM symbol carried on the Xth subband from the Xth subband of the frequency domain signal;
  • a second inverse mapping sub-module 10032 configured to extract, after the first OQAM symbol carried on the Xth subband, sequentially extract the bearer from the Xth subband of the frequency domain signal according to the first frequency interval.
  • the second OQAM symbol on the Xth subband up to the last OQAM symbol;
  • a third inverse mapping sub-module 10033 configured to extract, from the (x+1)th subband of the frequency domain signal, the first one carried on the (x+1)th subband according to the second frequency interval An OQAM symbol; wherein the X refers to any one of the frequency domain signals.
  • the receiver after receiving the FBMC signal from the transmitter, the receiver obtains the frequency domain signal by using the received FBMC signal, and finally according to the first frequency interval and the The two frequency intervals inversely map the frequency domain signals to obtain OQAM symbols carried on at least two subbands, wherein adjacent subcarriers in the same subband have a first frequency interval between adjacent two subbands.
  • There is a second frequency interval between adjacent subcarriers and the second frequency interval is a sum of the first frequency interval and the guard band interval, and the guard band interval is a fractional multiple of the first frequency interval.
  • the receiver Since the transmitter forms a second frequency interval between adjacent subcarriers of two adjacent subbands, and a first frequency interval is formed between adjacent subcarriers of the same subband, the receiver needs to be based on the first frequency.
  • the interval and the second frequency interval inversely map the frequency domain signal to restore the OQAM symbol generated by the transmitter.
  • the second frequency interval is a sum of the first frequency interval and the guard band interval
  • the guard band interval may perform subcarriers of adjacent subbands Effective isolation, by guarding the frequency band interval adjacent sub-band spectrum can achieve non-overlapping to achieve approximately orthogonal, so the guard band interval can eliminate mutual interference caused by adjacent sub-bands due to different channels, and due to protection
  • the band spacing is a fraction of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, so a fractional guard band spacing reduces the occupation of spectrum resources.
  • the embodiment of the present invention further provides a computer storage medium, wherein the computer storage medium stores a program, and the program executes some or all of the steps described in the foregoing method embodiments.
  • the transmitter 1100 includes:
  • the input device 1101, the output device 1102, the processor 1103, the memory 1104, and the filter 1105 (wherein the number of processors 1103 in the transmitter 1100 may be one or more, and one processor in Fig. 11 is taken as an example).
  • the input device 1101, the output device 1102, the processor 1103, and the memory 1104 may be connected by a bus or other means, wherein FIG. 11 is exemplified by a bus connection.
  • the processor 1103 is configured to perform the following steps:
  • the FBMC signal is sent to a receiver.
  • the processor 1103 is specifically configured to perform the following steps:
  • the processor 1103 is specifically configured to perform the following steps: mapping the nth OQAM symbol on the Xth subband to the yth subcarrier and the number of the Xth subband After the (n+1)th OQAM symbols are mapped to the (y+1)th subcarrier, the first frequency interval between the yth subcarrier and the (y+1)th subcarrier is implemented by:
  • the processor 1103 is configured to perform the following steps: mapping the last OQAM symbol on the Xth subband to the zth subcarrier;
  • the processor 1103 is specifically configured to perform the following steps: mapping the last OQAM symbol on the Xth subband to the zth subcarrier and the (x+1)th subband After the first OQAM symbol is mapped onto the (z+1)th subcarrier, the second frequency interval (m+) between the zth subcarrier and the (z+1)th subcarrier is implemented by: l) A: Inserting (k + p - 1 ) 0s between the last 0QAM symbol and the first 0QAM symbol;
  • k is the overlap factor of the prototype filter
  • p is the out-of-band rejection factor of the prototype filter
  • the processor 1103 is further configured to perform the following steps: before mapping the OQAM symbols on each subband to the respective subcarriers, according to the overlap factor and the outband suppression factor of the prototype filter. And obtaining, by the first frequency interval, the guard band interval, where the guard band interval is obtained by:
  • the G is the guard band interval
  • the overlap factor of the prototype filter the P is an out-of-band rejection factor of the prototype filter
  • the ⁇ is the first frequency interval.
  • the processor 1103 is further configured to: perform precoding on the OQAM symbols on each of the frequency domain signals before generating the FBMC signals by using the frequency domain signals.
  • the processor 1103 is specifically configured to perform the following steps: Generate OQAM symbols carried on the same subband for the same user.
  • the processor 1103 is specifically configured to perform the following steps: performing frequency domain filtering on the frequency domain signal;
  • the time domain misalignment is superposed on the time domain signal to obtain the FBMC signal.
  • the OQAM symbols on each subband are respectively mapped to the respective subcarriers to obtain a frequency domain signal, where the same sub There is a first frequency interval between adjacent subcarriers in the band, and a second frequency interval between adjacent subcarriers between adjacent two subbands, and the second frequency interval is a sum of the first frequency interval and the guard band interval And the guard band interval is a fractional multiple of the first frequency interval, then the frequency domain signal is generated for the FBMC signal, and finally the FBMC signal is sent to the receiver.
  • the second frequency interval is the first frequency interval between adjacent subcarriers in the same subband.
  • a frequency interval and The sum of the guard band intervals, the guard band interval can effectively isolate the subcarriers of the adjacent subbands, and the spectrum of the adjacent subbands of the guard band interval can be non-overlapping to achieve approximately orthogonality, so the guard band interval can be phased
  • the guard band interval is a fractional multiple of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, the guard band of the fractional multiple The spacing reduces the occupation of spectrum resources.
  • the receiver 1200 includes:
  • the input device 1201, the output device 1202, the processor 1203, the memory 1204, and the filter 1205 (wherein the number of the processors 1203 in the receiver 1200 may be one or more, and one processor in Fig. 12 is taken as an example).
  • the input device 1201, the output device 1202, the processor 1203, and the memory 1204 may be connected by a bus or other means, wherein the bus connection is taken as an example in FIG.
  • the processor 1203 is configured to perform the following steps:
  • the processor 1203 is specifically configured to: perform time domain symbol extraction on the received FBMC signal to obtain a time domain signal; and obtain a time domain signal obtained by time domain symbol extraction. Performing a discrete Fourier transform DFT to obtain a signal after DFT;
  • Frequency domain filtering is performed on the signal after DFT to obtain the frequency domain signal.
  • the processor 1203 is further configured to perform the following steps: performing channel equalization on the DFT signal before performing frequency domain filtering on the DFT signal.
  • the processor 1203 is further configured to: perform the following steps: if the received FBMC signal is a downlink signal, the frequency domain is obtained by using the received FBMC signal After the signal, the frequency domain signal mapped on the preset subcarrier is filtered out from the frequency domain signal; and the inverse mapping of the frequency domain signal according to the first frequency interval and the second frequency interval includes:
  • the frequency domain signals mapped on the preset subcarriers are inversely mapped according to the first frequency interval and the second frequency interval.
  • the processor 1203 is further configured to: perform inverse mapping on the frequency domain signal according to the first frequency interval and the second frequency interval to obtain a positive carried on at least two subbands After the amplitude modulation OQAM symbols, the OQAM symbols are channel equalized.
  • the processor 1203 is specifically configured to: perform, according to the second frequency interval, extract, from the Xth subband of the frequency domain signal, the bearer on the Xth subband.
  • the X refers to any one of the frequency domain signals.
  • the description of the present invention by the above embodiment shows that after receiving the FBMC signal from the transmitter, the receiver obtains the frequency domain signal from the received FBMC signal, and finally inversely maps the frequency domain signal according to the first frequency interval and the second frequency interval.
  • the interval, the second frequency interval is a sum of the first frequency interval and the guard band interval
  • the guard band interval is a fraction of the first frequency interval.
  • the receiver Since the transmitter forms a second frequency interval between adjacent subcarriers of two adjacent subbands, and a first frequency interval is formed between adjacent subcarriers of the same subband, the receiver needs to be based on the first frequency.
  • the interval and the second frequency interval inversely map the frequency domain signal to restore the OQAM symbol generated by the transmitter. Comparing the first frequency interval between adjacent subcarriers in the same subband, the second frequency interval is a sum of the first frequency interval and the guard band interval, and the guard band interval may perform subcarriers of adjacent subbands Effective isolation, by adjusting the spectrum of adjacent sub-bands of the frequency band interval, non-overlapping can be achieved to achieve approximate orthogonality, so the guard band interval can eliminate mutual interference caused by adjacent sub-bands due to different channels. Off, and since the guard band interval is a fraction of the first frequency interval and does not exceed one complete adjacent subcarrier spacing, the fractional guard band spacing reduces the occupation of the spectrum resources.
  • the device embodiments described above are merely illustrative, and the components may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Further, in the drawings of the apparatus embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection therebetween, and specifically, one or more communication buses or signal lines can be realized. Those of ordinary skill in the art can understand and implement without any creative effort.
  • the present invention can be implemented by means of software plus necessary general hardware, and of course, through dedicated hardware, including an application specific integrated circuit, a dedicated CPU, a dedicated memory, Special components and so on.
  • functions performed by computer programs can be easily implemented with the corresponding hardware.
  • the specific hardware structure used to implement the same function can be various, such as analog circuits, digital circuits, or dedicated circuits. Circuits, etc.
  • software program implementation is a better implementation in more cases.
  • the technical solution of the present invention which is essential or contributes to the prior art, may be embodied in the form of a software product stored in a readable storage medium, such as a floppy disk of a computer.
  • a readable storage medium such as a floppy disk of a computer.
  • U disk mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., including a number of instructions to make a computer device (may be a personal computer, server, or network device, etc.) performs the methods described in various embodiments of the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Transmitters (AREA)

Abstract

FBMC信号的发送方法、接收方法和发射机和接收机。其中,发送方法包括:生成包含在至少两个子带上的偏置正交幅度调制OQAM符号;将每个子带上的OQAM符号分别映射到各个子载波上,得到频域信号,其中,同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间的相邻子载波之间具有第二频率间隔,所述第二频率间隔为第一频率间隔和保护频带间隔之和,且所述保护频带间隔为第一频率间隔的分数倍;将所述频域信号生成FBMC信号;将所述FBMC信号发送给接收机。

Description

FBMC信号的发送方法、 接收方法和发射机以及接收机 技术领域
本发明实施例涉及的是通信技术领域, 尤其涉及一种滤波器组多载波 ( Filter Bank Multi-Carrier, FBMC )信号的发送方法、 接收方法和发射机以及 接收机。 背景技术
FBMC是一种多载波调制技术,相对于正交频分复用(英文全称 Orthogonal Frequency Division Multiplexing,英文简称 OFDM ), FBMC具有更低的带外辐 射和更高的频谱效率, 具有良好的应用前景。 FBMC的一个重要特征是相邻子 载波以及相邻 FBMC符号间会有不同程度的相互干扰, 例如, 任意一个时频 资源上的发送符号会在相邻的时频资源位置上产生附加的接收信号,从而引起 对有用接收信号的干扰。
FBMC典型的实现方案是使用正交频分复用 (英文简称 OFDM ) /偏置正 交幅度调制 (英文全称 Offset Quadrature Amplitude Modulation, 英文简称 OQAM )技术。 OFDM/OQAM和 OFDM不同之处在于, OFDM/OQAM系统 中发送的是纯实数或者纯虚数的 OQAM符号, 并且以实虚交替的规律在时频 资源元素上进行映射。但是发送符号对接收信号的干扰总是出现在与发送符号 相对的虚部或实部上。 因此如果信道在时域和频域范围内能够维持不变的话, 在进行信道均衡之后, 通过一个实虚部分离的操作就可以把干扰消除。
但是, 在实际应用中, 信道在时域和频域范围内通常不可能是不变的。 如 果信道在时域或者频域的维度上发生较显著的变化,那么信道发生变化的时域 中,信道在频域上变化较剧烈, 并且由于宽带多载波系统广泛釆用了频分多址 技术, 也会造成频域信道的显著变化。 因此, 如何消除频域边界的相互干扰仍 有待解决。 发明内容
本发明实施例提供了一种 FBMC信号的发送方法、 接收方法和发射机和 接收机, 能够有效消除频域边界的相互干扰。
第一方面, 本发明实施例提供一种 FBMC信号的发送方法, 包括: 生成包含在至少两个子带上的偏置正交幅度调制 OQAM符号;
将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间 的相邻子载波之间具有第二频率间隔,所述第二频率间隔为第一频率间隔和保 护频带间隔之和, 且所述保护频带间隔为第一频率间隔的分数倍;
将所述频域信号生成 FBMC信号;
将所述 FBMC信号发送给接收机。
结合第一方面,在第一方面的第一种可能的实现方式中,对于都属于同一 个子带的 OQAM符号,所述将每个子带上的 OQAM符号分别映射到各个子载 波上, 包括:
将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上;
将第 X个子带上的第(n+1 )个 OQAM符号映射到第(y+1 )个子载波上; 其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第( n+1 ) 个 OQAM符号是第 X个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
结合第一方面的第一种可能的实现方式,在第一方面的第二种可能的实现 方式中, 所述将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上以 及将第 X个子带上的第 (n+1 )个 OQAM符号映射到第 (y+1 )个子载波上之 后, 所述第 y个子载波和所述第(y+1 )个子载波之间具有第一频率间隔 Δ 通 过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k
- 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
结合第一方面,在第一方面的第三种可能的实现方式中,对于分属于两个 子带的 OQAM符号,所述将每个子带上的 OQAM符号分别映射到各个子载波 上, 包括: 将第 x个子带上的最后一个 OQAM符号映射到第 z个子载波上; 将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上; 其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
结合第一方面的第三种可能的实现方式,在第一方面的第四种可能的实现 方式中, 所述将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波上 以及将第 (x+1 )个子带上的第一个 OQAM符号映射到第 (z+1 )个子载波上 之后, 所述第 z 个子载波和所述第 (z+1 )个子载波之间具有第二频率间隔 (m+ 1)Δ 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
结合第一方面或第一方面的第一种可能或第二种可能或第三种可能的实 现方式,在第一方面的第五种可能的实现方式中,所述将每个子带上的 OQAM 符号分别映射到各个子载波上之前, 所述方法还包括:
根据原型滤波器的交叠因子和带外抑制因子以及所述第一频率间隔获取 所述保护频带间隔, 其中, 获取所述保护频带间隔通过如下方式:
G = - Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
结合第一方面,在第一方面的第六种可能的实现方式中, 所述将所述频域 信号生成 FBMC信号之前, 所述方法还包括:
对所述频域信号中每个子带上的 OQAM符号进行预编码。
结合第一方面,在第一方面的第七种可能的实现方式中, 所述生成至少两 个子带上的偏置正交幅度调制 OQAM符号, 包括:
为同一个用户生成承载在同一个子带上的 OQAM符号。
结合第一方面或第一方面的第一种可能或第二种可能或第三种可能的实 现方式, 在第一方面的第八种可能的实现方式中, 所述将所述频域信号生成 FBMC信号, 包括:
对所述频域信号进行频域滤波;
对频域滤波后的所述频域信号进行离散傅里叶逆变换 IDFT, 得到时域信 号;
对所述时域信号进行时域错位叠加, 得到所述 FBMC信号。
第二方面, 本发明实施例还提供一种 FBMC信号的接收方法, 包括: 接收 FBMC信号;
用接收到的 FBMC信号得到频域信号;
根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射,得到承载 在至少两个子带上的正交幅度调制 OQAM符号, 其中, 所述第一频率间隔为 同一个子带内的相邻子载波之间具有的频率间隔,所述第二频率间隔为相邻两 个子带之间的相邻子载波之间具有的频率间隔,所述第二频率间隔为所述第一 频率间隔和保护频带间隔之和,且所述保护频带间隔为所述第一频率间隔的分 数倍。
结合第二方面,在第二方面的第一种可能的实现方式中, 所述用接收到的 FBMC信号得到所述频域信号, 包括:
对接收到的的所述 FBMC信号进行时域符号提取, 得到时域信号; 对时域符号提取得到的时域信号进行离散傅里叶变换 DFT, 得到 DFT后 的信号;
对 DFT后的信号进行频域滤波, 得到所述频域信号。
结合第二方面的第一种可能的实现方式,在第二方面的第二种可能的实现 方式中, 所述对 DFT后的信号进行频域滤波之前, 所述方法还包括:
对 DFT后的信号进行信道均衡。
结合第二方面,在第二方面的第三种可能的实现方式中, 若接收到的的所 述 FBMC信号为下行信号时,所述用接收到的 FBMC信号得到频域信号之后, 所述方法还包括:
从所述频域信号中筛选出映射在预置的子载波上的频域信号;
所述根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射, 包 括: 根据第一频率间隔和第二频率间隔对映射在预置的子载波上的频域信号 进行逆映射。
结合第二方面,在第二方面的第四种可能的实现方式中, 所述根据第一频 率间隔和第二频率间隔对所述频域信号进行逆映射,得到承载在至少两个子带 上的正交幅度调制 OQAM符号之后, 所述方法还包括:
对所述 OQAM符号进行信道均衡。
结合第二方面, 在第二方面的第五种可能的实现方式中,
所述根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射,得到 承载在至少两个子带上的正交幅度调制 OQAM符号, 包括:
按照所述第二频率间隔从所述频域信号的第 X个子带上提取出承载在第 X 个子带上的第一个 OQAM符号;
提取到承载在第 X个子带上的第一个 OQAM符号之后, 按照所述第一频 率间隔依次从所述频域信号的第 X个子带上提取出承载在第 X个子带上的第二 个 OQAM符号直至最后一个 OQAM符号;
按照所述第二频率间隔从所述频域信号的第 (x+1 )个子带上提取出承载 在第 (x+1 )个子带上的第一个 OQAM符号;
其中, 所述 X指的是所述频域信号中的任意一个子带。
第三方面, 本发明实施例提供一种发射机, 包括:
符号生成模块, 用于生成包含在至少两个子带上的偏置正交幅度调制 OQAM符号;
符号映射模块, 用于将每个子带上的 OQAM符号分别映射到各个子载波 上,得到频域信号,其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相邻两个子带之间的相邻子载波之间具有第二频率间隔,所述第二频率间隔为 第一频率间隔和保护频带间隔之和,且所述保护频带间隔为第一频率间隔的分 数倍;
信号生成模块, 用于将所述频域信号生成 FBMC信号;
发送模块, 用于将所述 FBMC信号发送给接收机。
结合第三方面,在第三方面的第一种可能的实现方式中,对于都属于同一 个子带的 OQAM符号, 所述符号映射模块, 具体用于将第 X个子带上的第 n 个 OQAM符号映射到第 y个子载波上;将第 x个子带上的第( n+1 )个 OQAM 符号映射到第 (y+1 )个子载波上;
其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 η个 OQAM符号和所述第( η+1 ) 个 OQAM符号是第 X个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
结合第三方面的第一种可能的实现方式,在第三方面的第二种可能的实现 方式中, 所述将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上以 及将第 X个子带上的第 (n+1 )个 OQAM符号映射到第 (y+1 )个子载波上之 后, 所述第 y个子载波和所述第(y+1 )个子载波之间具有第一频率间隔 Δ 通 过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
结合第三方面,在第三方面的第三种可能的实现方式中,对于分属于两个 子带的 OQAM符号, 所述符号映射模块, 具体用于将第 X个子带上的最后一 个 OQAM符号映射到第 z个子载波上;将第( x+1 )个子带上的第一个 OQAM 符号映射到第 (z+1 )个子载波上;
其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
结合第三方面的第三种可能的实现方式,在第三方面的第四种可能的实现 方式中, 所述将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波上 以及将第 (x+1 )个子带上的第一个 OQAM符号映射到第 (z+1 )个子载波上 之后, 所述第 z 个子载波和所述第 (z+1 )个子载波之间具有第二频率间隔 (m+ 1)Δ 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。 结合第三方面或第三方面的第一种可能或第二种可能或第三种可能的实 现方式, 在第三方面的第五种可能的实现方式中, 所述发射机, 还包括:
保护频带间隔获取模块, 用于所述符号映射模块将每个子带上的 OQAM 符号分别映射到各个子载波上之前,根据原型滤波器的交叠因子和带外抑制因 子以及所述第一频率间隔获取所述保护频带间隔, 其中, 获取所述保护频带间 隔通过如下方式:
p
G = —Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
结合第三方面, 在第三方面的第六种可能的实现方式中, 所述发射机, 还 包括: 预编码模块, 用于所述信号生成模块将所述频域信号生成 FBMC信号 之前, 对所述频域信号中每个子带上的 OQAM符号进行预编码。
结合第三方面,在第三方面的第七种可能的实现方式中, 所述符号生成模 块, 具体用于为同一个用户生成承载在同一个子带上的 OQAM符号。
结合第三方面或第三方面的第一种可能或第二种可能或第三种可能的实 现方式, 在第三方面的第八种可能的实现方式中, 所述信号生成模块, 包括: 滤波器, 用于对所述频域信号进行频域滤波;
离散傅里叶逆变换模块,用于对频域滤波后的所述频域信号进行离散傅里 叶逆变换 IDFT, 得到时域信号;
错位叠加模块, 用于对所述时域信号进行时域错位叠加,得到所述 FBMC 信号。
第四方面, 本发明实施例还提供一种接收机, 包括:
信号接收模块, 用于接收 FBMC信号;
频域信号获取模块, 用于用接收到的 FBMC信号得到频域信号; 信号逆映射模块,用于根据第一频率间隔和第二频率间隔对所述频域信号 进行逆映射,得到承载在至少两个子带上的正交幅度调制 OQAM符号,其中, 所述第一频率间隔为同一个子带内的相邻子载波之间具有的频率间隔,所述第 二频率间隔为相邻两个子带之间的相邻子载波之间具有的频率间隔,所述第二 频率间隔为所述第一频率间隔和保护频带间隔之和,且所述保护频带间隔为所 述第一频率间隔的分数倍。
结合第四方面,在第四方面的第一种可能的实现方式中, 频域信号获取模 块, 包括:
时域信号提取子模块, 用于对接收到的的所述 FBMC信号进行时域符号 提取, 得到时域信号;
离散傅里叶变换子模块,用于对时域符号提取得到的时域信号进行离散傅 里叶变换 DFT, 得到 DFT后的信号;
滤波器, 用于对 DFT后的信号进行频域滤波, 得到所述频域信号。
结合第四方面的第一种可能的实现方式,在第四方面的第二种可能的实现 方式中, 所述频域信号获取模块, 还包括:
第一均衡器,用于所述滤波器对 DFT后的信号进行频域滤波之前,对 DFT 后的信号进行信道均衡。
结合第四方面,在第四方面的第三种可能的实现方式中, 若接收到的的所 述 FBMC信号为下行信号时, 所述接收机, 还包括:
频域信号筛选模块, 用于所述频域信号获取模块用接收到的 FBMC信号 得到频域信号之后,从所述频域信号中 选出映射在预置的子载波上的频域信 号;
所述信号逆映射模块,具体用于根据第一频率间隔和第二频率间隔对映射 在预置的子载波上的频域信号进行逆映射。
结合第四方面, 在第四方面的第四种可能的实现方式中, 所述接收机, 还 包括:
第二均衡器,用于所述信号逆映射模块根据第一频率间隔和第二频率间隔 对所述频域信号进行逆映射, 得到承载在至少两个子带上的正交幅度调制 OQAM符号之后, 对所述 OQAM符号进行信道均衡。
结合第四方面,在第四方面的第五种可能的实现方式中, 所述信号逆映射 模块, 包括:
第一逆映射子模块,用于按照所述第二频率间隔从所述频域信号的第 X个 子带上提取出承载在第 X个子带上的第一个 OQAM符号;
第二逆映射子模块, 用于提取到承载在第 X个子带上的第一个 OQAM符 号之后,按照所述第一频率间隔依次从所述频域信号的第 X个子带上提取出承 载在第 x个子带上的第二个 OQAM符号直至最后一个 OQAM符号; 第三逆映射子模块, 用于按照所述第二频率间隔从所述频域信号的第 ( x+1 )个子带上提取出承载在第 (x+1 )个子带上的第一个 OQAM符号; 其中, 所述 X指的是所述频域信号中的任意一个子带。
从以上技术方案可以看出, 本发明实施例具有以下优点:
本发明实施例中,发射机生成包含在至少两个子带上的 OQAM符号之后, 将每个子带上的 OQAM符号分别映射到各个子载波上,得到频域信号,其中, 同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间的相邻 子载波之间具有第二频率间隔,第二频率间隔为第一频率间隔和保护频带间隔 之和,且保护频带间隔为第一频率间隔的分数倍,接下来将频域信号生成进行 FBMC信号, 最后将 FBMC信号发送给接收机。 由于发射机在相邻两个子带 的相邻子载波之间形成有第二频率间隔,相比于在同一个子带内的相邻子载波 之间的第一频率间隔, 第二频率间隔为第一频率间隔和保护频带间隔之和,保 护频带间隔可以将相邻子带的子载波进行有效的隔离,通过保护频带间隔相邻 子带的频谱可以实现不重叠从而达到近似正交,故保护频带间隔可以将相邻子 带由于经历了不同信道而产生的相互干扰消除掉,并且由于保护频带间隔是第 一频率间隔的分数倍, 并没有超过一个完整的相邻子载波间隔,故分数倍的保 护频带间隔减小了对频谱资源的占用。 附图说明
图 1为本发明实施例提供的一种 FBMC信号的发送方法的流程方框示意 图; 间隔的一种实现方式示意图; 间隔之后和插入保护频带间隔之前相比较消除相互干扰的实现方式示意图; 图 3为本发明实施例提供的一种 FBMC信号的接收方法的流程方框示意 图;
图 4-A为本发明实施例提供的滤波器的时域特性的示意图;
图 4-B为本发明实施例提供的滤波器的频谱域特性的示意图; 图 5为本发明实施例中发射机实现的 FBMC信号的发送方法示意图; 图 6 为本发明实施例中在相邻子带之间插入保护频带间隔的一种应用场 景示意图;
图 7为本发明实施例中接收机实现的 FBMC信号的接收方法示意图; 图 8为本发明实施例中接收机实现的另一种 FBMC信号的接收方法示意 图;
图 9-A为本发明实施例提供的一种发射机的组成结构示意图;
图 9-B为本发明实施例提供的另一种发射机的组成结构示意图;
图 9-C为本发明实施例提供的另一种发射机的组成结构示意图;
图 9-D为本发明实施例提供的一种信号生成模块的组成结构示意图; 图 10-A为本发明实施例提供的一种接收机的组成结构示意图;
图 10-B为本发明实施例提供的另一种接收机的组成结构示意图; 图 10-C为本发明实施例提供的另一种接收机的组成结构示意图; 图 10-D为本发明实施例提供的另一种接收机的组成结构示意图; 图 10-E为本发明实施例提供的另一种接收机的组成结构示意图; 图 10-F为本发明实施例提供的一种信号逆映射模块的组成结构示意图; 图 11为本发明实施例提供的另一种发射机的组成结构示意图;
图 12为本发明实施例提供的另一种接收机的组成结构示意图。 具体实施方式
本发明实施例提供了一种 FBMC信号的发送方法、 接收方法和发射机和 接收机, 能够有效消除频域边界的相互干扰。
为使得本发明的发明目的、 特征、 优点能够更加的明显和易懂, 下面将结 合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、 完整地描 述,显然,下面所描述的实施例仅仅是本发明一部分实施例,而非全部实施例。 基于本发明中的实施例, 本领域的技术人员所获得的所有其他实施例,都属于 本发明保护的范围。
本发明的说明书和权利要求书及上述附图中的术语 "包括"和 "具有" 以 及他们的任何变形,意图在于覆盖不排他的包含,以便包含一系列单元的过程、 方法、 系统、 产品或设备不必限于那些单元, 而是可包括没有清楚地列出的或 对于这些过程、 方法、 产品或设备固有的其它单元。
以下分别进行详细说明。
发送 FBMC信号时, 相邻的子载波以及相邻的 FBMC信号间会有不同程 度的相互干扰。任意一个时频资源上发送的信号会在相邻的时频资源位置上产 生附加的接收信号,从而对接收到的有用信号形成干扰。这种干扰可以用滤波 器组的复用转接器(英文全称 Transmultiplexer, 英文简称 TMUX )响应来表 示, TMUX 响应反映了在理想信道条件下, 某个时频位置上的发送信号向周 边时频位置上扩散的程度。 请参阅如下表 1所示, 为 FBMC信号的相邻子载 波以及相邻 FBMC信号间产生相互干扰的示意表, 其中, 表 1给出了一种典 型的 TMUX响应表的示例, 表 1中的第一列代表了子载波编号, 第一行则代 表了 FBMC信号的编号。 表 1 中除了第一行和第一列中的系数表示中心位置 (即子载波 0和信号 0 )所发送的信号在周围对应的子载波和信号位置上所产 生的接收信号的系数。 举例来讲, 假设中心位置发送的信号为 , 子载波 i、 信号 j位置的系数为 ^¾, 则发送^)的过程中会在子载波 i、 信号 j位置上将产 生一个接收信号 x^)。 如果不釆取任何措施, 这个接收信号 ·χ 将对子载 波 i、信号 j位置发送的有用信号的接收产生干扰,这种相互干扰通常是 FBMC 信号所固有的特性。
Figure imgf000012_0001
Figure imgf000012_0002
在 FBMC信号的处理系统中, 发送信号为纯实数或纯虚数, 并且以实数 和虚数交替的规律在时频资源元素上进行映射。 在这个前提下, 根据上述表 1 的干扰系数表可知,相互干扰总是出现在与发送信号相对的虚部或实部上。 因 此如果信道在表 1所示的时频范围内是不变的,在进行信道均衡之后,通过一 个简单的实虚部分离的操作就可以把干扰消除。 举例来说, 假设表 1中的(子 载波 0, 信号 0 )位置发送的 OQAM符号是一个纯实数符号 ,。), 则根据实数 和虚数交替的规律, 则(子载波 0, 信号 1 )位置发送的 OQAM符号是一个纯 虚数, 记为 1) . '。 具体的, 以 ( 对 1) · ·的干扰为例, 暂时忽略其它位置的 干扰, 其它位置的干扰可以用相同的方法来分析。假设信道在表 1范围内保持 不变, 取值为 , 则在接收机处, (子载波 0, 信号 1 )位置的接收信号可以表 示为 y(Q = H (a0 l · j + a0 0 · 0.5644) + n , 其中 n表示噪声。 假设釆用迫零均衡算法, 贝1 J均衡后的信号为 w) = yM) /H = αο ι · j + a0 0 · 0.5644 + w/H。 显然, 干扰信号 。· 0.5644是纯实数, 而目标接收信号 Ω(()1) · 是纯虚数, 通过求 )的虚部就可 以把干扰信号完全消除。
但是, 在实际应用中, 并不能保证信道在表 1范围内是不变的。 如果信道 在时间或者频率维度上发生较显著的变化,那么信道发生变化的时域边界或者 频域边界处的相邻发送信号之间将产生相互干扰。 例如上面的例子中, 如果 。,经历的信道是 H,, 而 经历的信道是 H2, 则接收信号将变为 yW) = H2 - αο ι · j + H! · a0 0 - 0.5644 + n, 这种情况下通常无法通过均衡将 和 H2的影 响同时消除, 而 和^通常为复数, 因此无法在通过上例中的取虚部的方法 把干扰信号消除。 在宽带多载波系统中, 信道在频域上变化较剧烈, 并且由于 宽带多载波系统广泛釆用了频分多址技术, 也会产生造成频域信道的显著变 施例中为了消除 FBMC信号所固有的相互干扰, 特提出 FBMC信号的发送方 法、 接收方法和发射机以及接收机, 接下来首先对 FBMC信号的发送方法进 行详细说明:
请参阅图 1 所示, 本发明一个实施例提供的滤波器组多载波(英文全称 Filter Bank Multi-Carrier, 英文简称 FBMC )信号的发送方法, 具体可以包括 如下步骤:
101、 生成包含在至少两个子带上的偏置正交幅度调制 (英文全称 Offset Quadrature Amplitude Modulation, 英文简称 OQAM )符号。
在本发明实施例中, 子带 (英文全称 subband )指的是多个连续的子载波 所构成的一段频率资源。 发射机生成的多个 OQAM符号承载在各个子带上。 其中 OQAM符号的生成过程可参阅现有技术, 本发明实施例中不再赘述。
在本发明的一些实施例中, 发射机生成的 OQAM符号用于上行传输时, 不同用户的信号经历了不同的信道后到达接收机,从接收机的角度来讲,在不 同用户的时频资源的临界位置上,信道同样不是恒定的,因此同样将产生干扰。 在接收机处, 两个数据块相邻的若干个子载波上也将产生相互干扰。 因此为了 避免不同用户之间的相互干扰, 可选的,在本发明的一些实施例中发射机为同 一个用户生成承载在同一个子带上的 OQAM符号, 即发射机为一个用户生成 的 OQAM符号承载在一个子带上,为不用用户生成的 OQAM符号承载在不同 的子带上。
102、将每个子带上的 OQAM符号分别映射到各个子载波上,得到频域信 号。 同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间的 相邻子载波之间具有第二频率间隔。
其中, 第二频率间隔为第一频率间隔和保护频带间隔之和,且保护频带间 隔为第一频率间隔的分数倍。
在本发明实施例中,发射机生成 OQAM符号之后,发射机对 OQAM符号 进行子载波映射, 发射机将每个子带上的 OQAM符号分别映射到各个子载波 上, 在映射完成之后, 各个子载波之间保持固定的间隔, 也就是说, 只要是相 邻的两个子载波之间都具有间隔 (也可简称为子载波间隔), 并且同一个子带 内的相邻子载波之间具有第一频率间隔,相邻两个子带之间的相邻子载波之间 具有第二频率间隔, 由于第二频率间隔为第一频率间隔和保护频带间隔之和, 所以在本发明实施例中,对于同一个子带内的相邻子载波之间的第一频率间隔 是小于相邻两个子带之间的相邻子载波之间具有的第二频率间隔,从数值上来 讲, 第二频率间隔减去第一频率间隔就等于保护频带间隔。
在本发明的一些实施例中, 步骤 102将每个子带上的 OQAM符号分别映 射到各个子载波上具体可以包括两种情形: 一种是将同一个子带上的 OQAM 符号映射到子载波上, 另一种是将相邻子带上各自承载的 OQAM符号映射到 子载波上。 具体的, 对于都属于同一个子带的 OQAM符号, 步骤 102将每个 子带上的 OQAM符号分别映射到各个子载波上, 可以包括如下步骤:
将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上;
将第 X个子带上的第(n+1 )个 OQAM符号映射到第(y+1 )个子载波上; 其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第 ( n+1 ) 个 OQAM符号是第 x个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
也就是说, 发射机可以对步骤 101中生成的所有 OQAM符号分别进行映 射,举例说明,以 X表示发射机进行子载波映射的子带,若发射机生成的 OQAM 符号承载在 4个子带上, 则 X的取值就可以为 1或 2或 3或 4, 以 n来表示第 X个子带上的任意一个 OQAM符号, 若发射机在第 X个子带上共承载有 5个 OQAM符号, 则 n的取值就可以为 1或 2或 3等, ( n+1 )就可以表示与 n相 邻的 OQAM符号,用 y来表示第 X个子带上的第 n个 OQAM符号映射到的子 载波。 以 X的取值为 1以及第 1个子带上共承载有 5个 OQAM符号为例, 首 先将第 1个子带上的第 1个 OQAM符号映射到第 y个子载波上, 然后将第 1 个子带上的第 2个 OQAM符号映射到第 (y+1 )个子载波上, ..., 直到将第 1 个子带上的第 5个 OQAM符号映射到了第 (y+4 )个子载波上。 按照如上描 述的方式对属于同一个子带的 OQAM符号进行子载波映射, 同一个子带内的 相邻子载波之间都具有相同的间隔值,该间隔值为第一频率间隔,可以用 Δ 来 表示。
进一步的, 在本发明的一些实施例中, 将第 X个子带上的第 n个 OQAM 符号映射到第 y个子载波上以及将第 X个子带上的第 (n+1 )个 OQAM符号 映射到第 (y+1 )个子载波上之后, 从频域上来讲, 第 y个子载波和第 (y+1 ) 个子载波之间具有第一频率间隔 Δ 通过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k
- 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
也就是说, 发射机在进行子载波映射时, 对于属于同一个子带的 OQAM 符号分别映射到子载波上的情形, 相邻子载波(即第 y个子载波和第 (y+1 ) 个子载波)之间具有的第一频率间隔是通过在第 n个 OQAM符号和第 (n+1 ) 个 OQAM符号之间插入(k - 1 )个 0来实现的, 其中 k是发射机设置的原型 滤波器的交叠因子。
在本发明的另一些实施例中, 对于分属于两个子带的 OQAM符号, 步骤 102将每个子带上的 OQAM符号分别映射到各个子载波上, 具体可以包括如 下步骤: 将第 x个子带上的最后一个 OQAM符号映射到第 z个子载波上; 将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上; 其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
也就是说, 发射机可以对步骤 101中生成的所有 OQAM符号分别进行映 射,举例说明,以 X表示发射机进行子载波映射的子带,若发射机生成的 OQAM 符号承载在 4个子带上, 则 X的取值就可以为 1或 2或 3, 用 ( x+1 )表示与 X 相邻的子带, 若将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波 上, 则与第 X个子带相邻的第 (x+1 )个子带上的第一个 OQAM符号就可以 映射到第 (z+1 )个子载波上。 以 X的取值为 1以及第 1个子带上共承载有 5 个 OQAM符号为例,对于分属于两个子带的 OQAM符号的实现场景,举例说 明如下: 将第 1个子带上的第 5个 OQAM符号映射到第 z个子载波上, 然后 将第 2个子带上的第 1个 OQAM符号映射到第 z+1个子载波上。 按照如上描 述的方式对分属于两个子带的 OQAM符号进行子载波映射, 分属于两个子带 的相邻子载波之间都具有相同的间隔值, 该间隔值为第二频率间隔, 可以用 (m+ l)A 来表示, m表示一个大于 0的分数, m A 就可以表示保护频带间隔。
进一步的,在本发明的一些实施例中,将第 X个子带上的最后一个 OQAM 符号映射到第 z个子载波上以及将第( x+1 )个子带上的第一个 OQAM符号映 射到第 ( z+1 )个子载波上之后, 从频域上来讲, 第 z个子载波和第 ( z+1 )个 子载波之间具有第二频率间隔 (m+ 1)Δ 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
也就是说, 发射机在进行子载波映射时, 对于分属于两个子带的 OQAM 符号分别映射到子载波上的情形, 相邻子载波(即第 z个子载波和第 (z+1 ) 个子载波 )之间具有的第二频率间隔是通过在第 X个子带上的最后一个 OQAM 符号和在第 (x+1 )个子带上的第一个 OQAM符号之间插入(k + p - 1 )个 0 来实现的, 其中 k是发射机设置的原型滤波器的交叠因子, p为原型滤波器的 带外抑制因子。 其中, 在本发明中, 带外抑制因子是一个反映原型滤波器带外 抑制效果的参数。 原型滤波器的带外抑制效果越好, 则带外抑制因子越小, 反 之则越大。 确定带外抑制因子的方法是, 如果在相邻两个 OQAM符号之间插 入 (k+p-1)个 0, 且经过频域滤波之后, 所述相邻两个 OQAM符号的频谱的能 量主要部分不产生交叠, 则认为 p是一个合理的带外抑制因子取值。
在本发明的一些实施例中,同一个子带内的相邻子载波之间具有第一频率 间隔和相邻两个子带之间的相邻子载波之间具有第二频率间隔,还可以通过如 下方式实现: 首先在所有的相邻子载波之间都插入第一频率间隔, 即无论是同 一个子带内的还是分属于两个子带之间的都插入第一频率间隔,然后对于分属 于两个子带之间的相邻子载波再插入保护频带间隔,所以保护频带间隔再加上 第一频率间隔就可以得到第二频率间隔。
也就是说, 发射机将所有 OQAM符号分别映射到各个子载波之后, 所有 的相邻子载波之间都具有第一频率间隔, 然后发射机在 FBMC信号中相邻两 个子带之间的相邻子载波之间再插入保护频带间隔,其中保护频带间隔是一个 取值为第一频率间隔的分数倍的间隔值,该间隔值的作用是用于保护相邻两个 子带上的 OQAM符号不产生相互干扰。 由于发射机在不同子带之间插入有保 护频带间隔, 而保护频带间隔可以将相邻子带进行有效的隔离,通过保护频带 间隔相邻子带的频谱可以实现不重叠从而达到近似正交,故保护频带间隔可以 将相邻子带由于经历了不同信道而产生的相互干扰消除掉,并且由于保护频带 间隔是第一频率间隔的分数倍, 并没有超过一个完整的相邻子载波间隔,故分 数倍的保护频带间隔减小了对频谱资源的占用。
举例说明如下, 第 X个子带的最后一个 OQAM符号映射到第 z个子载波 上, 第 (x+1 )个子带上的第一 OQAM符号映射到第 (z+1 )个子载波上, 分 属于两个子带的第 z个子载波和第(z+1 )个子载波之间先插入 Δ , 然后在第 ζ个子载波和第 (z+1 )个子载波之间再插入 πι Δ/·, 其中, πι Δ 为保护频带间 隔, m为大于 0的分数。
也就是说, 在第 z个子载波和第 (z+1 )个子载波之间存在间隔为 Δ 时, 本发明实施例中发射机插入的保护频带间隔为 m Δ , 并且 m是一个大于 0的 分数值。 在这种情况下, 通过步骤 102可知, 对于分属于两个不同子带的子载 波, 第 z个子载波和第 (z+1 )个子载波之间相隔(m +1) Δ 。 请参阅如图 2-Α 护频带间隔的一种实现方式示意图, 在时域(t )上连续分布有第 X个子带和 第 (x+1 )个子带, 在频域(f )上第 X个子带和第 (x+1 )个子带之间插入有 保护频带间隔, 可见,在不同子带之间插入的保护频带间隔可以将相邻子带进 行有效的隔离,故保护频带间隔可以将相邻子带由于经历了不同信道而产生的 相互干扰消除掉。
需要澄清的是,本发明实施例中,保护频带间隔为第一频率间隔的分数倍, 此处分数倍指的是一个大于 0的分数, 也可以认为分数倍是一个纯小数。
在本发明的实施例中,保护频带间隔的取值为第一频率间隔的分数倍,在 实际应用中, 保护频带间隔的获取方式有多种, 具体的, 在本发明的一些实施 例中, 步骤 102将每个子带上的 OQAM符号分别映射到各个子载波上之前, 本发明实施例提供的 FBMC信号的发送方法还可以包括如下步骤:
根据原型滤波器的交叠因子和带外抑制因子以及所述第一频率间隔获取 所述保护频带间隔, 其中, 获取所述保护频带间隔通过如下方式:
G = - Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
也就是说,发射机中配备有滤波器,发射机可以根据原型滤波器的交叠因 子和带外抑制因子以及第一频率间隔来确定保护频带间隔的取值, 其中, 交叠 因子的取值由发射机配备的滤波器来决定,带外抑制因子是指滤波器对通带以 外的信号的抑制程度,发射机可以使用滤波器的相关参数来确定保护频带间隔 的取值,本发明实施例中发射机只要设置的保护频带间隔的取值为第一频率间 隔的方式, 例如发射机可以预置一个分数倍的值作为保护频带间隔, 当发射机 将所有的 OQAM符号都映射到各个子载波上之后, 就可以将预置的保护频带 间隔插入到相邻子带的相邻子载波之间。
举例说明,在本发明实施例中, 同一个子带内的相邻子载波之间具有第一 频率间隔 (也就可以称之为子载波间隔, 例如 Δ )是固定的。 本发明实施例 中在相邻子带之间插入保护频带间隔 (也可以简称为保护间隔), 而且保护间 隔 (G )是分数子载波间隔, G f , 其中 K为正整数, P为非负整数。 也就是说, 插入了保护间隔后, 两个相邻子带的相邻子载波间隔变为了
K 插入保护频带间隔之后和插入保护频带间隔之前相比较消除相互干扰的实现 方式示意图, 图 2-B中, 用于实线表示子带 1的频谱, 用虚线表示子带 2的频 谱,图 2-B中左半部分为插入保护频带间隔之前子带 1和子带 2之间存在干扰 的频谱重叠示意图,图 2-B中右半部分为插入保护频带间隔之后相互干扰被消 除的频谱不重叠示意图,通过在相邻子带之间插入保护间隔,相邻子带的频谱 的能量主要部分可以实现不重叠从而达到近似正交。 另外, 若不同的子带分配 给不同的用户, 还可以保证用户之间的正交。
在 FBMC信号的技术领域中, 信号是以子载波为单位进行处理的, 通常 情况下, 保护间隔只能是整数倍的子载波间隔 (如 1个或 2个子载波间隔), 但是按照本发明实施例提供的方法, 保护间隔可以只是分数倍的子载波间隔 (例如 3/4个子载波间隔)。 故分数倍的保护频带间隔减小了对频谱资源的占 用。
103、 将频域信号生成 FBMC信号。
在本发明实施例中, 发射机将每个子带上的 OQAM符号分别映射到各个 子载波上得到频域信号后,该频域信号在同一个子带内的相邻子载波之间具有 第一频率间隔,在相邻两个子带之间的相邻子载波之间具有第二频率间隔,发 射机得到上述频域信号之后, 发射机将该频域信号生成 FBMC信号。
需要说明的是, 在本发明的一些实施例中, 步骤 103 将频域信号生成 FBMC信号, 可以包括如下步骤:
Al、 对频域信号进行频域滤波;
A2、 对频域滤波后的所述频域信号进行离散傅里叶逆变换 (英文全称 Inverse Discrete Fourier Transform, 英文简称 IDFT ), 得到时域信号;
A3、 对所述时域信号进行时域错位叠加, 得到所述 FBMC信号。
具体来说, 对于步骤 Al, 发射机对频域信号进行频域滤波, 得到频域滤 波后的频域信号。 多个子带上承载的 OQAM符号构成 FBMC信号, 并且每个 FBMC信号都包括有多个子带上承载的 OQAM符号, 在本发明实施例中, 发 射机将频域信号进行频域滤波, 具体可以通过发射机中配置的滤波器来实现。 在本发明的一些实施例中, 步骤 A1对频域信号进行频域滤波, 具体可以 包括如下步骤:
将频域信号与发射机中配置的滤波器的频域响应进行卷积,得到频域滤波 后的频域信号。
在本发明的一些实施例中, 步骤 A1对频域信号进行频域滤波之前, 本发 明实施例提供的 FBMC信号的发送方法, 还可以包括如下步骤:
对所述频域信号进行预编码。
其中,发射机在已知信道状态信息的情况下,通过在发送端对发送的信号 做一个预先的处理即预编码, 可以方便接收机进行信号检测。
需要说明的是, 在本发明实施例中, 对于 FBMC信号适用的其中一个典 型场景是在多输入多输出(英文全称 Multiple Input Multiple Output- Filter Bank Multi Carrier, 英文简称 MIMO-FBMC ) 系统中, 如果使用了预编码技术, 那 么信道将变成等效信道, 可以通过信道和预编码矩阵的乘积来表示。 由于通常 预编码是按照一定的时频粒度进行的, 因此在不同预编码码块的频域边界附 近, 等效信道可能不再恒定。 举例说明, 数据块 1和数据块 2上如果使用了不 同的预编码矩阵 P1和 P2,那么即便可以认为数据块 1和数据块 2相邻的子载 波上经历的信道都是 H,但两个数据块临界的相邻子载波上的等效信道仍然分 别是 H*P1和 H*P2, 这将产生相邻子载波之间的相互干扰。 本发明实施例中 通过步骤 102的描述可知,发射机在相邻两个子带之间的相邻子载波之间具有 第二频率间隔, 并且第二频率间隔由第一频率间隔和保护频带间隔组成, 而保 相邻两个子带的频谱实现不重叠从而达到近似正交,故保护频带间隔可以将相 邻的两个子带由于经历了不同信道而产生的相互干扰消除掉。
对于步骤 A2, 发射机对频域信号进行频域滤波之后, 发射机对频域滤波 后的频域信号进行 IDFT, 得到时域信号。 进一步的, 当原型滤波器的交叠因 子的取值为 2 的整数次幂时, 步骤 A2发射机对频域滤波后的频域信号进行 IDFT, 具体可以包括如下步骤:
对频域滤波后的频域信号进行快速傅里叶逆变换(英文全称 Inverse Fast Fourier Transform, 英文简称 IFFT ), 得到时域信号。 其中, 因为 IFFT通常特指基为 2的快速傅里叶变换, 如果交叠因子的值 不是 2的整数次幂时,但也可以在频域信号中加 0使其满足 2的整数次幂的要 求, 在这种情况下也可以进行 IFFT。
对于步骤 A3, 发射机对频域信号进行 IDFT之后, 发射机对时域信号进 行时域错位叠加, 得到 FBMC信号, 该 FBMC信号需要由发射机发送给接收 机。 进一步的, 步骤 A3具体可以包括如下步骤:
按照错位间隔为 T/2K对时域信号进行时域错位, 其中, T为一个 FBMC 时域信号的数据长度, K为原型滤波器的交叠因子;
对错位后的各个时域信号进行叠加, 得到 FBMC信号。
在实际应用中, 错位间隔可以为 T/2K, 当然, 发射机还可以根据具体的 应用场景来灵活设定错位的间隔取值。 当对所有的时域信号都完成错位之后, 发射机再对错位后的各个时域信号进行叠加, 可以得到时域错位叠加后的 FBMC信号。
104、 将 FBMC信号发送给接收机。
在本发明实施例中, 发射机对 FBMC信号完成错位叠加之后, 发射机将
FBMC信号发送给接收机, 由接收机来接收并进行解析。
在实际应用中, 对于上行 FBMC信号的处理过程, 发射机具体可以为终 端, 接收机具体可以为基站, 即终端将生成的 FBMC信号发送给基站, 另夕卜, 对于下行 FBMC信号的处理过程, 发射机具体可以为基站, 接收机具体可以 为终端, 即基站将生成的 FBMC信号发送给终端。
通过以上实施例对本发明的描述可知,发射机生成包含在至少两个子带上 的 OQAM符号之后, 将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相 邻两个子带之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频 率间隔和保护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍,接下 来将频域信号生成进行 FBMC信号, 最后将 FBMC信号发送给接收机。 由于 发射机在相邻两个子带的相邻子载波之间形成有第二频率间隔,相比于在同一 个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率间隔和 保护频带间隔之和, 保护频带间隔可以将相邻子带的子载波进行有效的隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交,故保护 频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除掉,并且 由于保护频带间隔是第一频率间隔的分数倍,并没有超过一个完整的相邻子载 波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。
以上实施例从发射机一侧对本发明实施例提供的 FBMC信号的发送方法 进行了描述, 接下来介绍本发明实施例提供的 FBMC信号的接收方法, 由接 收机来实现, 请参阅如图 3所示, 主要可以包括如下步骤:
301、 接收 FBMC信号。
在本发明实施例中, 发射机将 FBMC信号发送出去之后, 接收机可以正 常接收到 FBMC信号。
302、 用接收到的 FBMC信号得到频域信号。
在本发明实施例中, 接收机接收到 FBMC信号之后, 接收机用接收到的 FBMC信号得到频域信号。
具体的, 接收机用接收到的 FBMC信号得到频域信号具体可以包括如下 步骤:
Bl、 对接收到的的所述 FBMC信号进行时域符号提取, 得到时域信号;
B2、 对时域符号提取得到的时域信号进行离散傅里叶变换 (英文全称 Discrete Fourier Transform, 英文简称 DFT ), 得到 DFT后的信号;
B3、 对 DFT后的信号进行频域滤波, 得到所述频域信号。
对于步骤 Bl, 接收机首先对接收到的 FBMC信号进行时域符号提取, 得 到时域信号。 进一步的, 步骤 B1对接收到的 FBMC信号进行时域符号提取, 得到时域信号, 具体可以包括如下步骤:
对接收到的 FBMC信号按照错位间隔 T/2K进行时域符号提取, 其中, T 为时域信号的数据长度, K为原型滤波器的交叠因子。
也就是说, 接收机对发射机发送的 FBMC信号进行时域符号提取时可以 按照发射机设置的错位间隔来进行提取, 则提取到的两个 FBMC信号之间有 T/2K个延迟。
对于步骤 B2,接收机对时域符号提取得到的时域信号进行 DFT,得到 DFT 后的信号, 以实现将 FBMC信号从时域到频域的还原。
需要说的是,在本发明的一些实施例中, 当交叠因子的取值为 2的整数次 幂时, 步骤 B2对时域符号提取得到的时域信号进行 DFT, 具体可以包括如下 步骤:
对时域符号提取得到的时域信号进行快速傅里叶变换 (英文全称 Fast Fourier Transform, 英文简称 FFT )。
其中, 因为 FFT通常特指基为 2的快速傅里叶变换, 如果交叠因子的值 不是 2的整数次幂时, 如果发射机在 FBMC频域信号中加 0使其满足 2的整 数次幂的要求而釆用了 IFFT, 在这种情况下接收机也可以进行和发射机的 IFFT相同点数的 FFT。
对于步骤 B3, 在本发明实施例中, 接收机对 FBMC信号进行 DFT之后, 接收机还需要对 DFT后的 FBMC信号进行频域滤波, 得到频域信号, 其中频 域滤波具体可以通过接收机中配置的滤波器来实现。
进一步的, 步骤 B3对 DFT后的信号进行频域滤波, 得到频域信号, 具体 可以包括如下步骤:
将 DFT后的信号与发射机配备的滤波器的频率响应的共轭进行卷积, 得 到频域信号。
其中,接收机配备的滤波器和发射机配备的滤波器在系数上互为共轭,通 过滤波器的频域滤波, 接收机可以生成频域信号。
在本发明的一些实施例中, 步骤 B3对 DFT后的信号进行频域滤波,得到 频域信号之前, 本发明实施例提供的 FBMC信号的接收方法还可以包括如下 步骤:
对 DFT后的信号进行信道均衡。
具体的, 可以通过接收机中配置的均衡器来实现, 对于衰落信道, 均衡器 作为一种可调滤波器, 可以校正和补偿信道衰落, 减少码间干扰的影响。
具体的, 对 DFT后的信号进行信道均衡, 具体可包括如下步骤: 将 DFT后的信号与均衡器的系数进行相乘,得到信道均衡后的时域信号, 其中, 均衡器的系数为接收机的信道频率响应的倒数。
303、 根据第一频率间隔和第二频率间隔对频域信号进行逆映射, 得到承 载在至少两个子带上的正交幅度调制 OQAM符号, 第一频率间隔为同一个子 带内的相邻子载波之间具有的频率间隔,第二频率间隔为相邻两个子带之间的 相邻子载波之间具有的频率间隔。
其中, 第二频率间隔为第一频率间隔和保护频带间隔之和,且保护频带间 隔为第一频率间隔的分数倍。
需要说明的是, 在本发明的一些实施例中, 若发射机进行下行数据传输, 步骤 302 用接收到的 FBMC信号得到频域信号之后, 本发明实施例提供的 FBMC信号的发送方法还可以包括如下步骤:
从所述频域信号中筛选出映射在预置的子载波上的频域信号;
在这种应用场景下,步骤 303根据第一频率间隔和第二频率间隔对所述频 域信号进行逆映射, 具体可以包括如下步骤:
根据第一频率间隔和第二频率间隔对映射在预置的子载波上的频域信号 进行逆映射。
其中, 若发射机进行的是下行数据传输, 则对于 MIMO-FBMC系统来说, 发射机发送的下行 FBMC信号可能并不是只传输给一个用户的, 则接收机用 接收到的 FBMC信号得到频域信号之后, 接收机可以只在某个或某些特定子 载波上进行逆映射, 而并不需要在全部的子载波上都进行逆映射, 例如, 对于 发射机进行下行信号传输的情况,则接收机只需要提取出调度给自己的子载波 上的数据即可, 无需对所有子载波上的数据进行后续处理, 而如果发射机进行 的是上行信号传输,则接收机需要提取所有有用的子载波上的数据进行后续处 理。 具体的, 接收机可以对频域信号进行筛选, 从所有的频域信号中筛选出映 射在预置的子载波上的频域信号。
在本发明实施例中,接收机对频域信号按照发射机进行映射相反的方式进 行逆映射,即接收机可以根据第一频率间隔和第二频率间隔从频域信号中取出 数据,作为逆映射的结果。 由于发射机在对频域信号进行映射时釆用了两种间 隔(即对于同一个子带内的相邻子载波釆用的第一频率间隔和对于相邻两个子 带之间的相邻子载波釆用的第二频率间隔;), 那么接收机在进行信号还原时可 以按照上述第一频率间隔和第二频率取出数据,得到承载在至少两个子带上的 OQAM信号。
在本发明实施例中,接收机在进行逆映射时,对于每个子带内的相邻子载 波可以根据第一频率间隔取出 OQAM符号, 而对于分属于两个子带的相邻子 载波, 由于发射机在分属于两个子带的相邻子载波之间插入的是第二频率间 隔, 而第二频率间隔为第一频率间隔和保护频带间隔之后, 那么接收机在进行 逆映射时, 也需要按照发射机插入的第二频率间隔来还原出 OQAM符号。 由 于发射机在相邻两个子带之间的相邻子载波插入有保护频带间隔,而保护频带 间隔可以将相邻的两个子带进行有效的隔离,通过保护频带间隔可以实现相邻 的两个子带的频谱不重叠从而达到近似正交,故保护频带间隔可以将相邻的两 个子带由于经历了不同信道而产生的相互干扰消除掉,并且由于保护频带间隔 是第一频率间隔的分数倍, 并没有超过一个完整的相邻子载波间隔,故分数倍 的保护频带间隔减小了对频谱资源的占用。
在本发明的一些实施例中,步骤 303根据第一频率间隔和第二频率间隔对 所述频域信号进行逆映射, 得到承载在至少两个子带上的正交幅度调制 OQAM符号之后, 本发明实施例提供的 FBMC信号的接收方法, 还可以包括 如下步骤:
对 OQAM符号进行信道均衡。
具体的, 可以通过接收机中配置的均衡器来实现, 对于衰落信道, 均衡器 作为一种可调滤波器, 可以校正和补偿信道衰落, 减少码间干扰的影响。
具体的, 对 OQAM符号进行信道均衡, 可包括如下步骤:
将 OQAM符号与均衡器的系数进行相乘,得到信道均衡后的 OQAM符号, 其中, 均衡器的系数为接收机的信道频率响应的倒数。
通过前述的内容描述可知, 本发明实施例中接收机对 FBMC信号的信道 均衡可以在频域滤波之前完成,也可以在根据第一频率间隔和第二频率间隔对 频域信号进行逆映射之后来完成, 具体可以取决于具体的应用场景。
在本发明的一些实施例中,步骤 303根据第一频率间隔和第二频率间隔对 频域信号进行逆映射, 得到承载在至少两个子带上的正交幅度调制 OQAM符 号, 具体可以包括如下步骤:
Cl、 按照所述第二频率间隔从所述频域信号的第 X个子带上提取出承载 在第 X个子带上的第一个 OQAM符号;
C2、 提取到承载在第 X个子带上的第一个 OQAM符号之后, 按照所述第 一频率间隔依次从所述频域信号的第 X个子带上提取出承载在第 X个子带上的 第二个 OQAM符号直至最后一个 OQAM符号;
C3、 按照所述第二频率间隔从所述频域信号的第 (x+1 )个子带上提取出 承载在第 (x+1 )个子带上的第一个 OQAM符号;
其中, 所述 X指的是所述频域信号中的任意一个子带。 具体的, 对于步骤 Cl, 第 X个子带的第一个子载波和第 (x-1 )个子带的 最后一个子载波为分属于两个子带的相邻子载波, 其间隔为第二频率间隔, 所 以按照第二频率间隔可以从频域信号的第 X个子带上提取出承载在第 X个子带 上的第一个 OQAM符号。对于步骤 C2, 第 X个子带的第二子载波和第 X个子 带的第三个子载波, 其间隔为第一频率间隔, 并且对于第 X个子带的第三个子 载波和第 X个子带的第四个子载波, 其间隔都是第一频率间隔, 所以按照第一 频率间隔可以从频域信号的第 X个子带上提取出承载在第 X个子带上的第二个 OQAM符号直至最后一个 OQAM符号, 对于步骤 C3, 第 (x+1 )个子带的第 一个子载波和第 X个子带的最后一个子载波为分属于两个子带的相邻子载波, 其间隔为第二频率间隔, 所以按照第二频率间隔可以从频域信号的第 (x+1 ) 个子带上提取出承载在第 (x+1 )个子带上的第一个 OQAM符号。 通过如上 方式的描述就可以从频域信号中提取出完整的 OQAM符号。
通过以上实施例对本发明的描述可知, 接收机从发射机接收到 FBMC信 号之后, 用接收到的 FBMC信号得到频域信号, 最后根据第一频率间隔和第 二频率间隔对频域信号进行逆映射, 得到承载在至少两个子带上的 OQAM符 号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相邻两个子带 之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频率间隔和保 护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍。 由于发射机在相 邻两个子带的相邻子载波之间形成有第二频率间隔,而在同一个子带的相邻子 载波之间形成有第一频率间隔,所以接收机需要根据第一频率间隔和第二频率 间隔对频域信号进行逆映射, 才能还原出发射机生成的 OQAM符号。 相比于 在同一个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率 间隔和保护频带间隔之和,保护频带间隔可以将相邻子带的子载波进行有效的 隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交, 故保护频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除 掉, 并且由于保护频带间隔是第一频率间隔的分数倍, 并没有超过一个完整的 相邻子载波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。
为便于更好的理解和实施本发明实施例的上述方案,下面举例相应的应用 场景来进行具体说明。
为了实现分数倍的保护频带间隔,本发明实施例可配置满足如下要求的滤 波器:
1 )、 原型滤波器具有较窄的频域过渡带, 其中, 过渡带指从滤波器频域响 应的中心到频域响应接近为 0的这段频谱间隔,判断是否接近为 0的指标是看 是否对传输性能造成较大影响, 例如可以认为小于 -30dB的频域响应是接近于 0的, 因为通常无线通信系统的信干噪比在 30dB以下。
2 )、 原型滤波器在 OQAM调制下具有良好的实数域正交性。
通过现有的一些滤波器设计和优化技术可以实现这种滤波器,请参阅如图 4-A和图 4-B所示,为本发明实施例提供的滤波器的时域和频谱特性的示意图, 图 4-A和图 4-B中给出了一个满足上述两个条件的原型滤波器,它由一个滚降 系数 α=0.125的升余弦滤波器经过优化得到, 交叠因子为 8。
请参阅如图 5所示, 为本发明实施例中发射机实现的 FBMC信号的发送 方法示意图, 主要包括如下步骤:
发射机中配备的原型滤波器的交叠因子为 Κ,频域子载波的个数为 Μ。发 射机的具体实现方法如下列步骤所述:
Sl、 生成包含在至少两个子带上的 OQAM符号
假设生成的 OQAM符号包含了 L个子带,其中 L大于等于 2。这里用 , , ... ..., 来表示用于生成第 n个 FBMC信号的 L个子带上的 OQAM符号 组成的向量, 其中 ― J , ¾ = [ 。 IT , ,
¾ = [ 0, 1,-, ¾-17' Ν, , Ν2 , ……, N£都为正整数,代表了每个子带中的子 载波个数, 且 + N2 + = N≤M。 n代表 FBMC信号的编号, N代表有用 子载波的总数, 它在数值上不大于总子载波个数 M, <z代表第 i个子带的第 z 号子载波的用于生成第 n个 FBMC信号的数据。
S2、 子载波映射
子载波映射的作用是将上述 L个子带上的 OQAM符号映射到子载波上 (用矢量 表示映射后的所有子载波上的数据), 假设两个子载波之间的原有 间隔 Δ 为 1个间隔单位, 并在子带之间插入分数倍的保护频带间隔。
其中, 发射机进行的映射规则如下:
1 )、 对于第 i个子带内部的子载波映射, 如果<。映射到 ^., 则将 映射 到 ^, 依此类推, 即映射后各个子载波保持固定的间隔, 即交叠因子 K 。 2 )、 对于相邻子带的临界位置, 为了避免干扰产生, 使前一个子带的最后 一个子载波和后一个子带的第一个子载波之间的频率间隔为 K+P , 其中 P为 非负整数。 即如果第 i个子带的最后一个子载波映射到 .上, 则第 i+1个子带 的第 0号子载波映射到 上。
4叚设滤波器交叠因子 K为 8, P为 4, 请参阅如图 6所示, 为本发明实施 例中在相邻子带之间插入保护频带间隔的一种应用场景示意图,图 6给出了子 带 i和子带 i+1的临界位置的子载波映射结果, 其中, 在相同的子带内, 两个 相邻的子载波之间被插入了 K-1个 0, 而在两个子带之间, 则被插入了 K+P-1 个 0。
S3、 频域滤波
频域滤波的作用是对经过映射后的数据块 在频率进行滤波操作。频域滤 波的实现方式上, 可以通过将 ¾与滤波器频率响应 ή进行卷积得到, 即
cn = bn on ,
其中符号 Θ为卷积计算符, fi为原型滤波器的频率响应, 它的长度通常为 KM,但对于具有较好频域局域性的滤波器,也可以将其功率较小的系数截断, 使其长度小于 KM, 从而减小计算复杂度。
54、 IDFT
对数据 进行 τ点 IDFT变换得到 J„, 其中 T是一个不小于 KM的值, 即 Γ≥ Μ。 如果 Τ大于 ΚΜ, 则可以在?„的两侧插入 0补足 Τ点, 再做 IDFT 即可。 显然, IDFT变换后的 的长度为 T个釆样点。
如果 T的值为 2的整数次幂,则可以进行基为 2的快速傅里叶逆变换, 即 IFFT变换。
55、 时域错位叠加
下一步进行并串转换, 并串转换后, 第 n+1个实数符号对应的 T点数据 要比第 n个实数符号对应的 T点数据延迟 T/2K点, 所有实数符号完成错位后 再叠加, 并行的数据就变为串行数据流, 发射机再将 FBMC信号发送给接收 机。
而对于接收机, 可以有两种 FBMC信号的接收方法, 其主要差异在于均 衡器的位置, 请参阅如图 7所示, 为本发明实施例中接收机实现的 FBMC信 号的接收方法示意图, 主要包括如下步骤:
Sl、 接收信号时域符号提取
提取第 n个 FBMC信号的时域符号,得到 , en是长度为 T的矢量。 „+1的 T点数据要比 ^的 T点数据要延迟 T/2K点。
S2、 DFT
en进行 T点 DFT操作得到 /„。 由于 Γ≥ M, 如果 Γ > KM, 则按照发射机 端补 0的规律, 去掉/„两侧多余的 0, 得到长度为 KM的有效数据/„。
Step3、 信道均衡
在进行均衡时, 假设信道频率响应为 C(i), 那么均衡器的系数为:
EQ{i) = -^—, 0≤i≤KM-l 于是经过信道均衡后的信号为:
gn,, =fn,,xEQ(i), 0≤i≤KM-l 其中, /„,,是/„的第 i个元素, ^是 的第 i个元素。
S4、 频域滤波
频域滤波是发射机频域滤波的匹配滤波操作, 可以通过卷积来实现。具体 实现方法是令 与 ή'进行卷积操作, 即 = „〇fi', 其中 δ'是 ή的共轭, 其中 符号〇表示卷积。
S5、 子载波逆映射
子载波的逆映射与发射机的子载波映射模块相对应。 经过逆映射,得到和 发送端的发送数据 , an 2, ……, 相对应的待检测数据?, ?„2, ……, , 其 中 是 对应的待检测值, 有 其中 是噪声向量。 如图 7 所示, 接收机进行逆映射之后, 输出结果 、 q 、 .. 。 子载波逆映射是发送的子载 波映射的逆过程, 其具体方法为:
1)、对于第 i个子带内的数据,每间隔 K个位置取出一个数值作为逆映射 的结果。例如: 如果 被逆映射到 , 则 ^被逆映射到 +1,其中 是 的 第 1个元素, 是 ^„的第 j个元素。
2)、 对于相邻子带的临界位置, 在发射端进行子载波映射时, 前一个子带 的最后一个子载波和后一个子带的第一个子载波之间的频率间隔为 K+P 。 因 此在接收端进行子载波逆映射时,在两个相邻子带的临界两个子载波之间的频 率间隔是 Κ+Ρ。 即如果 被逆映射到了子带 i的最后一个子载波上, 则 ^ 将被逆映射到第 i+1个子带的第一个子载波上。
需要指出的是,如果是下行信号传输, 则接收机只需要提取出调度给自己 的子载波上的数据即可, 无需对所有子载波上的数据进行后续处理。 而如果是 上行信号传输, 则接收机需要提取所有有用的子载波上的数据进行后续处理。
在本发明的一些实施例中, 接收机生成 OQAM 符号之后, 还可以进行 OQAM数据解调, 其中, OQAM数据的解调以及译码等处理过程请参阅现有 技术。
经过以上这些操作, 插入分数倍的保护频带间隔的 FBMC系统得以实现。 请参阅如图 8所示, 为本发明实施例中接收机实现的另一种 FBMC信号 的接收方法示意图, 和图 7的不同在于均衡器转移到了子载波映射之后进行。 均衡的实现方法和 S3中没有差别, 区别在于图 7中最多需要对 KM个数据进 行均衡操作, 而图 8中最多只需要对 M个数据进行进行均衡操作。
本发明实施例中, 在 FBMC 系统不同子带之间插入保护频带间隔来消除 相邻子带间干扰。保护频带间隔能够做到分数子载波间隔宽度, 节省了频语资 源。
需要说明的是, 对于前述的各方法实施例, 为了简单描述, 故将其都表述 为一系列的动作组合, 但是本领域技术人员应该知悉, 本发明并不受所描述 的动作顺序的限制, 因为依据本发明, 某些步骤可以釆用其他顺序或者同 时进行。 其次, 本领域技术人员也应该知悉, 说明书中所描述的实施例均 属于优选实施例, 所涉及的动作和模块并不一定是本发明所必须的。
为便于实施本发明实施例的上述方案, 下面还提供用于实施上述方案 的相关装置。
请参阅图 9-A所示, 本发明实施例提供的一种发射机 900, 可以包括: 符 号生成模块 901、符号映射模块 902、信号生成模块 903、发送模块 904,其中, 符号生成模块 901, 用于生成包含在至少两个子带上的偏置正交幅度调制 OQAM符号; 符号映射模块 902, 用于将每个子带上的 OQAM符号分别映射到各个子 载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率 间隔,相邻两个子带之间的相邻子载波之间具有第二频率间隔, 所述第二频率 间隔为第一频率间隔和保护频带间隔之和,且所述保护频带间隔为第一频率间 隔的分数倍;
信号生成模块 903, 用于将所述频域信号生成 FBMC信号;
发送模块 904, 用于将所述 FBMC信号发送给接收机。
在本发明的一些实施例中, 对于都属于同一个子带的 OQAM符号, 所述 符号映射模块 902,具体用于将第 X个子带上的第 n个 OQAM符号映射到第 y 个子载波上; 将第 X个子带上的第 (n+1 )个 OQAM符号映射到第 ( y+1 )个 子载波上;
其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第( n+1 ) 个 OQAM符号是第 X个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
进一步的, 所述将第 X个子带上的第 n个 OQAM符号映射到第 y个子载 波上以及将第 X个子带上的第 (n+1 )个 OQAM符号映射到第 (y+1 )个子载 波上之后, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ 通过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
在本发明的一些实施例中, 对于分属于两个子带的 OQAM符号, 所述符 号映射模块 902,具体用于将第 X个子带上的最后一个 OQAM符号映射到第 z 个子载波上; 将第 (x+1 )个子带上的第一个 OQAM符号映射到第 (z+1 )个 子载波上;
其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。 进一步的, 所述将第 x个子带上的最后一个 OQAM符号映射到第 z个子 载波上以及将第 (x+1 )个子带上的第一个 OQAM符号映射到第 (z+1 )个子 载波上之后, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率 间隔(m+ 1)Δ 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入( k + p
- 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
在本发明的一些实施例中, 请参阅如图 9-B所示, 所述发射机 900, 还包 括: 保护频带间隔获取模块 905, 其中, 所述保护频带间隔获取模块 905, 用 于所述符号映射模块将每个子带上的 OQAM符号分别映射到各个子载波上之 前,根据原型滤波器的交叠因子和带外抑制因子以及所述第一频率间隔获取所 述保护频带间隔, 其中, 获取所述保护频带间隔通过如下方式:
p
G = —Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
在本发明的一些实施例中, 请参阅如图 9-C所示, 所述发射机 900, 相比 于如图 9-A所示的发射机 900, 还包括: 预编码模块 906, 用于所述信号生成 模块 903将所述频域信号生成 FBMC信号之前, 对所述频域信号中每个子带 上的 OQAM符号进行预编码。
在本发明的一些实施例中, 符号生成模块 901, 具体用于为同一个用户生 成承载在同一个子带上的 OQAM符号。
在本发明的一些实施例中, 请参阅如图 9-D所示, 信号生成模块 903, 包 括:
滤波器 9031, 用于对所述频域信号进行频域滤波;
离散傅里叶逆变换模块 9032, 用于对频域滤波后的所述频域信号进行离 散傅里叶逆变换 IDFT, 得到时域信号;
错位叠加模块 9033, 用于对所述时域信号进行时域错位叠加, 得到所述 FBMC信号。 通过以上实施例对本发明的描述可知,发射机生成包含在至少两个子带上 的 OQAM符号之后, 将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相 邻两个子带之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频 率间隔和保护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍,接下 来将频域信号生成进行 FBMC信号, 最后将 FBMC信号发送给接收机。 由于 发射机在相邻两个子带的相邻子载波之间形成有第二频率间隔,相比于在同一 个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率间隔和 保护频带间隔之和, 保护频带间隔可以将相邻子带的子载波进行有效的隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交,故保护 频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除掉,并且 由于保护频带间隔是第一频率间隔的分数倍,并没有超过一个完整的相邻子载 波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。
请参阅图 10-A所示, 本发明实施例提供的一种接收机 1000, 可以包括: 信号接收模块 1001、 频域信号获取模块 1002、 信号逆映射模块 1003, 其中, 信号接收模块 1001, 用于接收 FBMC信号;
频域信号获取模块 1002, 用于用接收到的 FBMC信号得到频域信号; 信号逆映射模块 1003, 用于根据第一频率间隔和第二频率间隔对所述频 域信号进行逆映射,得到承载在至少两个子带上的正交幅度调制 OQAM符号, 其中, 所述第一频率间隔为同一个子带内的相邻子载波之间具有的频率间隔, 所述第二频率间隔为相邻两个子带之间的相邻子载波之间具有的频率间隔,所 述第二频率间隔为所述第一频率间隔和保护频带间隔之和,且所述保护频带间 隔为所述第一频率间隔的分数倍。
在本发明的一些实施例中, 请参阅如图 10-B 所示, 频域信号获取模块 1002, 包括:
时域信号提取子模块 10021,用于对接收到的的所述 FBMC信号进行时域 符号提取, 得到时域信号;
离散傅里叶变换子模块 10022, 用于对时域符号提取得到的时域信号进行 离散傅里叶变换 DFT, 得到 DFT后的信号;
滤波器 10023, 用于对 DFT后的信号进行频域滤波, 得到所述频域信号。 进一步的, 请参阅如图 10-C所示, 频域信号获取模块 1002, 还包括: 第一均衡器 10024, 用于所述滤波器 10023对 DFT后的信号进行频域滤 波之前, 对 DFT后的信号进行信道均衡。
在本发明的一些实施例中,请参阅如图 10-D所示,相对于如图 10-A所示 的接收机, 若接收到的的所述 FBMC信号为下行信号时, 接收机 1000, 还可 以包括:
频域信号筛选模块 1004, 用于所述频域信号获取模块用接收到的 FBMC 信号得到频域信号之后,从所述频域信号中筛选出映射在预置的子载波上的频 域信号;
在这种应用场景下, 所述信号逆映射模块 1003, 具体用于根据第一频率 间隔和第二频率间隔对映射在预置的子载波上的频域信号进行逆映射。
在本发明的一些实施例中,请参阅如图 10-E所示,相对于如图 10-A所示 的接收机, 接收机 1000, 还包括: 第二均衡器 1005, 用于所述信号逆映射模 块 1003根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射, 得到 承载在至少两个子带上的正交幅度调制 OQAM符号之后,对所述 OQAM符号 进行信道均衡。
在本发明的一些实施例中,请参阅如图 10-F所示,信号逆映射模块 1003, 具体可以包括:
第一逆映射子模块 10031, 用于按照所述第二频率间隔从所述频域信号的 第 X个子带上提取出承载在第 X个子带上的第一个 OQAM符号;
第二逆映射子模块 10032, 用于提取到承载在第 X 个子带上的第一个 OQAM符号之后, 按照所述第一频率间隔依次从所述频域信号的第 X个子带 上提取出承载在第 X个子带上的第二个 OQAM符号直至最后一个 OQAM符 号;
第三逆映射子模块 10033, 用于按照所述第二频率间隔从所述频域信号的 第 (x+1 )个子带上提取出承载在第 (x+1 )个子带上的第一个 OQAM符号; 其中, 所述 X指的是所述频域信号中的任意一个子带。
通过以上实施例对本发明的描述可知, 接收机从发射机接收到 FBMC信 号之后, 用接收到的 FBMC信号得到频域信号, 最后根据第一频率间隔和第 二频率间隔对频域信号进行逆映射, 得到承载在至少两个子带上的 OQAM符 号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相邻两个子带 之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频率间隔和保 护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍。 由于发射机在相 邻两个子带的相邻子载波之间形成有第二频率间隔,而在同一个子带的相邻子 载波之间形成有第一频率间隔,所以接收机需要根据第一频率间隔和第二频率 间隔对频域信号进行逆映射, 才能还原出发射机生成的 OQAM符号。 相比于 在同一个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率 间隔和保护频带间隔之和,保护频带间隔可以将相邻子带的子载波进行有效的 隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交, 故保护频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除 掉, 并且由于保护频带间隔是第一频率间隔的分数倍, 并没有超过一个完整的 相邻子载波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。 本发明实施例还提供一种计算机存储介质, 其中, 该计算机存储介质存储 有程序, 该程序执行包括上述方法实施例中记载的部分或全部步骤。
接下来介绍本发明实施例提供的另一种发射机, 请参阅图 11所示, 发射 机 1100包括:
输入装置 1101、输出装置 1102、处理器 1103、存储器 1104、滤波器 1105(其 中发射机 1100中的处理器 1103的数量可以一个或多个, 图 11中以一个处理 器为例)。 在本发明的一些实施例中, 输入装置 1101、 输出装置 1102、 处理器 1103和存储器 1104可通过总线或其它方式连接, 其中, 图 11 中以通过总线 连接为例。
其中, 处理器 1103, 用于执行如下步骤:
生成包含在至少两个子带上的偏置正交幅度调制 OQAM符号;
将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间 的相邻子载波之间具有第二频率间隔,所述第二频率间隔为第一频率间隔和保 护频带间隔之和, 且所述保护频带间隔为第一频率间隔的分数倍;
将所述频域信号生成 FBMC信号; 将所述 FBMC信号发送给接收机。
在本发明的一些实施例中, 对于都属于同一个子带的 OQAM符号, 处理 器 1103, 具体用于执行如下步骤:
将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上;
将第 X个子带上的第(n+1 )个 OQAM符号映射到第(y+1 )个子载波上; 其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第( n+1 ) 个 OQAM符号是第 X个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
在本发明的一些实施例中, 处理器 1103, 具体用于执行如下步骤: 所述将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上以及将 第 X个子带上的第 (n+1 )个 OQAM符号映射到第 (y+1 )个子载波上之后, 通过如下方式实现所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一 频率间隔
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
在本发明的一些实施例中, 对于分属于两个子带的 OQAM符号, 处理器 1103 , 具体用于执行如下步骤: 将第 X个子带上的最后一个 OQAM符号映射 到第 z个子载波上;
将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上; 其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
在本发明的一些实施例中, 处理器 1103, 具体用于执行如下步骤: 所述将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波上以及 将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上之后, 通过如下方式实现所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二 频率间隔 (m+ l)A : 在所述最后一个 0QAM符号和所述第一个 0QAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
在本发明的一些实施例中, 处理器 1103, 还用于执行如下步骤: 将每个 子带上的 OQAM符号分别映射到各个子载波上之前, 根据原型滤波器的交叠 因子和带外抑制因子以及所述第一频率间隔获取所述保护频带间隔, 其中, 获 取所述保护频带间隔通过如下方式:
p
G = —Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
在本发明的一些实施例中, 处理器 1103, 还用于执行如下步骤: 将所述 频域信号生成 FBMC信号之前,对所述频域信号中每个子带上的 OQAM符号 进行预编码。
在本发明的一些实施例中, 处理器 1103, 具体用于执行如下步骤: 为同一个用户生成承载在同一个子带上的 OQAM符号。
在本发明的一些实施例中, 处理器 1103, 具体用于执行如下步骤: 对所述频域信号进行频域滤波;
对频域滤波后的所述频域信号进行离散傅里叶逆变换 IDFT, 得到时域信 号;
对所述时域信号进行时域错位叠加, 得到所述 FBMC信号。
通过以上实施例对本发明的描述可知,发射机生成包含在至少两个子带上 的 OQAM符号之后, 将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相 邻两个子带之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频 率间隔和保护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍,接下 来将频域信号生成进行 FBMC信号, 最后将 FBMC信号发送给接收机。 由于 发射机在相邻两个子带的相邻子载波之间形成有第二频率间隔,相比于在同一 个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率间隔和 保护频带间隔之和, 保护频带间隔可以将相邻子带的子载波进行有效的隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交,故保护 频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除掉,并且 由于保护频带间隔是第一频率间隔的分数倍,并没有超过一个完整的相邻子载 波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。
接下来介绍本发明实施例提供的另一种接收机, 请参阅图 12-A所示, 接 收机 1200包括:
输入装置 1201、输出装置 1202、处理器 1203、存储器 1204、滤波器 1205(其 中接收机 1200中的处理器 1203的数量可以一个或多个, 图 12中以一个处理 器为例)。 在本发明的一些实施例中, 输入装置 1201、 输出装置 1202、 处理器 1203和存储器 1204可通过总线或其它方式连接, 其中, 图 12中以通过总线 连接为例。
其中, 处理器 1203, 用于执行如下步骤:
接收 FBMC信号;
用接收到的 FBMC信号得到频域信号;
根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射,得到承载 在至少两个子带上的正交幅度调制 OQAM符号, 其中, 所述第一频率间隔为 同一个子带内的相邻子载波之间具有的频率间隔,所述第二频率间隔为相邻两 个子带之间的相邻子载波之间具有的频率间隔,所述第二频率间隔为所述第一 频率间隔和保护频带间隔之和,且所述保护频带间隔为所述第一频率间隔的分 数倍。
在本发明的一些实施例中, 处理器 1203, 具体用于执行如下步骤: 对接收到的的所述 FBMC信号进行时域符号提取, 得到时域信号; 对时域符号提取得到的时域信号进行离散傅里叶变换 DFT, 得到 DFT后 的信号;
对 DFT后的信号进行频域滤波, 得到所述频域信号。
在本发明的一些实施例中, 处理器 1203, 还用于执行如下步骤: 对 DFT 后的信号进行频域滤波之前, 对 DFT后的信号进行信道均衡。
在本发明的一些实施例中, 处理器 1203, 还用于执行如下步骤: 若接收 到的的所述 FBMC信号为下行信号时, 所述用接收到的 FBMC信号得到频域 信号之后, 从所述频域信号中筛选出映射在预置的子载波上的频域信号; 所述根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射, 包 括:
根据第一频率间隔和第二频率间隔对映射在预置的子载波上的频域信号 进行逆映射。
在本发明的一些实施例中, 处理器 1203, 还用于执行如下步骤: 根据第 一频率间隔和第二频率间隔对所述频域信号进行逆映射,得到承载在至少两个 子带上的正交幅度调制 OQAM符号之后, 对所述 OQAM符号进行信道均衡。
在本发明的另一些实施例中, 处理器 1203, 具体用于执行如下步骤: 按照所述第二频率间隔从所述频域信号的第 X个子带上提取出承载在第 X 个子带上的第一个 OQAM符号;
提取到承载在第 X个子带上的第一个 OQAM符号之后, 按照所述第一频 率间隔依次从所述频域信号的第 X个子带上提取出承载在第 X个子带上的第二 个 OQAM符号直至最后一个 OQAM符号;
按照所述第二频率间隔从所述频域信号的第 (x+1 )个子带上提取出承载 在第 (x+1 )个子带上的第一个 OQAM符号;
其中, 所述 X指的是所述频域信号中的任意一个子带。
通过以上实施例对本发明的描述可知, 接收机从发射机接收到 FBMC信 号之后, 用接收到的 FBMC信号得到频域信号, 最后根据第一频率间隔和第 二频率间隔对频域信号进行逆映射, 得到承载在至少两个子带上的 OQAM符 号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相邻两个子带 之间的相邻子载波之间具有第二频率间隔,第二频率间隔为第一频率间隔和保 护频带间隔之和,且保护频带间隔为第一频率间隔的分数倍。 由于发射机在相 邻两个子带的相邻子载波之间形成有第二频率间隔,而在同一个子带的相邻子 载波之间形成有第一频率间隔,所以接收机需要根据第一频率间隔和第二频率 间隔对频域信号进行逆映射, 才能还原出发射机生成的 OQAM符号。 相比于 在同一个子带内的相邻子载波之间的第一频率间隔,第二频率间隔为第一频率 间隔和保护频带间隔之和,保护频带间隔可以将相邻子带的子载波进行有效的 隔离, 通过保护频带间隔相邻子带的频谱可以实现不重叠从而达到近似正交, 故保护频带间隔可以将相邻子带由于经历了不同信道而产生的相互干扰消除 掉, 并且由于保护频带间隔是第一频率间隔的分数倍, 并没有超过一个完整的 相邻子载波间隔, 故分数倍的保护频带间隔减小了对频谱资源的占用。
另外需说明的是, 以上所描述的装置实施例仅仅是示意性的, 其中所述作 部件可以是或者也可以不是物理单元, 即可以位于一个地方, 或者也可以分布 到多个网络单元上。可以根据实际的需要选择其中的部分或者全部模块来实现 本实施例方案的目的。 另外, 本发明提供的装置实施例附图中, 模块之间的连 接关系表示它们之间具有通信连接,具体可以实现为一条或多条通信总线或信 号线。本领域普通技术人员在不付出创造性劳动的情况下,即可以理解并实施。
通过以上的实施方式的描述,所属领域的技术人员可以清楚地了解到本发 明可借助软件加必需的通用硬件的方式来实现,当然也可以通过专用硬件包括 专用集成电路、 专用 CPU、 专用存储器、 专用元器件等来实现。 一般情况下, 凡由计算机程序完成的功能都可以很容易地用相应的硬件来实现, 而且, 用来 实现同一功能的具体硬件结构也可以是多种多样的, 例如模拟电路、数字电路 或专用电路等。但是,对本发明而言更多情况下软件程序实现是更佳的实施方 式。基于这样的理解, 本发明的技术方案本质上或者说对现有技术做出贡献的 部分可以以软件产品的形式体现出来,该计算机软件产品存储在可读取的存储 介质中, 如计算机的软盘, U盘、 移动硬盘、 只读存储器(ROM, Read-Only Memory )、 随机存取存 4诸器(RAM, Random Access Memory )、 磁碟或者光盘 等, 包括若干指令用以使得一台计算机设备(可以是个人计算机, 服务器, 或 者网络设备等)执行本发明各个实施例所述的方法。
综上所述, 以上实施例仅用以说明本发明的技术方案, 而非对其限制; 尽 管参照上述实施例对本发明进行了详细的说明,本领域的普通技术人员应当理 解: 其依然可以对上述各实施例所记载的技术方案进行修改, 或者对其中部分 技术特征进行等同替换; 而这些修改或者替换, 并不使相应技术方案的本质脱 离本发明各实施例技术方案的精神和范围。
+

Claims

权 利 要 求
1、 一种滤波器组多载波 FBMC信号的发送方法, 其特征在于, 包括: 生成包含在至少两个子带上的偏置正交幅度调制 OQAM符号;
将每个子带上的 OQAM符号分别映射到各个子载波上, 得到频域信号, 其中, 同一个子带内的相邻子载波之间具有第一频率间隔,相邻两个子带之间 的相邻子载波之间具有第二频率间隔,所述第二频率间隔为第一频率间隔和保 护频带间隔之和, 且所述保护频带间隔为第一频率间隔的分数倍;
将所述频域信号生成 FBMC信号;
将所述 FBMC信号发送给接收机。
2、 根据权利要求 1所述的方法, 其特征在于, 对于都属于同一个子带的
OQAM符号, 所述将每个子带上的 OQAM符号分别映射到各个子载波上, 包 括:
将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上;
将第 X个子带上的第(n+1 )个 OQAM符号映射到第(y+1 )个子载波上; 其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第( n+1 ) 个 OQAM符号是第 X个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
3、 根据权利要求 2所述的方法, 其特征在于, 所述将第 X个子带上的第 n个 OQAM符号映射到第 y个子载波上以及将第 x个子带上的第 ( n+1 )个 OQAM符号映射到第(y+1 )个子载波上之后,所述第 y个子载波和所述第(y+1 ) 个子载波之间具有第一频率间隔 Δ 通过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
4、 根据权利要求 1 所述的方法, 其特征在于, 对于分属于两个子带的 OQAM符号, 所述将每个子带上的 OQAM符号分别映射到各个子载波上, 包 括:
将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波上; 将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上; 其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
5、 根据权利要求 4所述的方法, 其特征在于, 所述将第 X个子带上的最 后一个 OQAM符号映射到第 z个子载波上以及将第(x+1 )个子带上的第一个 OQAM符号映射到第(z+1 )个子载波上之后,所述第 z个子载波和所述第(z+1 ) 个子载波之间具有第二频率间隔 (m+ 1)Δ 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
6、 根据权利要求 1至 4中任一项所述的方法, 其特征在于, 所述将每个 子带上的 OQAM符号分别映射到各个子载波上之前, 所述方法还包括:
根据原型滤波器的交叠因子和带外抑制因子以及所述第一频率间隔获取 所述保护频带间隔, 其中, 获取所述保护频带间隔通过如下方式:
p
G = —Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
7、 根据权利要求 1所述的方法, 其特征在于, 所述将所述频域信号生成
FBMC信号之前, 所述方法还包括:
对所述频域信号中每个子带上的 OQAM符号进行预编码。
8、 根据权利要求 1所述的方法, 其特征在于, 所述生成至少两个子带上 的偏置正交幅度调制 OQAM符号, 包括:
为同一个用户生成承载在同一个子带上的 OQAM符号。
9、 根据权利要求 1至 4中任一项所述的方法, 其特征在于, 所述将所述 频域信号生成 FBMC信号, 包括:
对所述频域信号进行频域滤波;
对频域滤波后的所述频域信号进行离散傅里叶逆变换 IDFT, 得到时域信 号;
对所述时域信号进行时域错位叠加, 得到所述 FBMC信号。
10、 一种滤波器组多载波 FBMC信号的接收方法, 其特征在于, 包括: 接收 FBMC信号;
用接收到的 FBMC信号得到频域信号;
根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射,得到承载 在至少两个子带上的正交幅度调制 OQAM符号, 其中, 所述第一频率间隔为 同一个子带内的相邻子载波之间具有的频率间隔,所述第二频率间隔为相邻两 个子带之间的相邻子载波之间具有的频率间隔,所述第二频率间隔为所述第一 频率间隔和保护频带间隔之和,且所述保护频带间隔为所述第一频率间隔的分 数倍。
11、 根据权利要求 10所述的方法, 其特征在于, 所述用接收到的 FBMC 信号得到所述频域信号, 包括:
对接收到的的所述 FBMC信号进行时域符号提取, 得到时域信号; 对时域符号提取得到的时域信号进行离散傅里叶变换 DFT, 得到 DFT后 的信号;
对 DFT后的信号进行频域滤波, 得到所述频域信号。
12、 根据权利要求 11所述的方法, 其特征在于, 所述对 DFT后的信号进 行频域滤波之前, 所述方法还包括:
对 DFT后的信号进行信道均衡。
13、根据权利要求 10所述的方法,其特征在于,若接收到的的所述 FBMC 信号为下行信号时, 所述用接收到的 FBMC信号得到频域信号之后, 所述方 法还包括:
从所述频域信号中筛选出映射在预置的子载波上的频域信号;
所述根据第一频率间隔和第二频率间隔对所述频域信号进行逆映射, 包 括:
根据第一频率间隔和第二频率间隔对映射在预置的子载波上的频域信号 进行逆映射。
14、 根据权利要求 10所述的方法, 其特征在于, 所述根据第一频率间隔 和第二频率间隔对所述频域信号进行逆映射,得到承载在至少两个子带上的正 交幅度调制 OQAM符号之后, 所述方法还包括:
对所述 OQAM符号进行信道均衡。
15、 根据权利要求 10所述的方法, 其特征在于, 所述根据第一频率间隔 和第二频率间隔对所述频域信号进行逆映射,得到承载在至少两个子带上的正 交幅度调制 OQAM符号, 包括:
按照所述第二频率间隔从所述频域信号的第 X个子带上提取出承载在第 X 个子带上的第一个 OQAM符号;
提取到承载在第 X个子带上的第一个 OQAM符号之后, 按照所述第一频 率间隔依次从所述频域信号的第 X个子带上提取出承载在第 X个子带上的第二 个 OQAM符号直至最后一个 OQAM符号;
按照所述第二频率间隔从所述频域信号的第 (x+1 )个子带上提取出承载 在第 (x+1 )个子带上的第一个 OQAM符号;
其中, 所述 X指的是所述频域信号中的任意一个子带。
16、 一种发射机, 其特征在于, 包括:
符号生成模块, 用于生成包含在至少两个子带上的偏置正交幅度调制
OQAM符号;
符号映射模块, 用于将每个子带上的 OQAM符号分别映射到各个子载波 上,得到频域信号,其中, 同一个子带内的相邻子载波之间具有第一频率间隔, 相邻两个子带之间的相邻子载波之间具有第二频率间隔,所述第二频率间隔为 第一频率间隔和保护频带间隔之和,且所述保护频带间隔为第一频率间隔的分 数倍;
信号生成模块, 用于将所述频域信号生成 FBMC信号;
发送模块, 用于将所述 FBMC信号发送给接收机。
17、 根据权利要求 16所述的发射机, 其特征在于, 对于都属于同一个子 带的 OQAM符号, 所述符号映射模块, 具体用于将第 X个子带上的第 n个
OQAM符号映射到第 y个子载波上; 将第 X个子带上的第 (n+1 )个 OQAM 符号映射到第 (y+1 )个子载波上;
其中, 所述第 y个子载波和所述第 (y+1 )个子载波之间具有第一频率间 隔 Δ , 所述 X指的是所述至少两个子带中的任意一个子带, 所述 η指的是第 X个子带上的任意一个 OQAM符号, 所述第 n个 OQAM符号和所述第 ( n+1 ) 个 OQAM符号是第 x个子带上的相邻两个 OQAM符号, 所述 x、 y、 n均为正 整数。
18、 根据权利要求 17所述的发射机, 其特征在于, 所述将第 X个子带上 的第 n个 OQAM符号映射到第 y个子载波上以及将第 X个子带上的第 ( n+1 ) 个 OQAM符号映射到第 (y+1 )个子载波上之后, 所述第 y个子载波和所述 第 (y+1 )个子载波之间具有第一频率间隔 Δ 通过如下方式实现:
在所述第 n个 OQAM符号和所述第 ( n+1 )个 OQAM符号之间插入 ( k - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子。
19、 根据权利要求 16所述的发射机, 其特征在于, 对于分属于两个子带 的 OQAM符号, 所述符号映射模块, 具体用于将第 X个子带上的最后一个 OQAM符号映射到第 z个子载波上; 将第 (x+1 )个子带上的第一个 OQAM 符号映射到第 (z+1 )个子载波上;
其中, 所述第 z个子载波和所述第 (z+1 )个子载波之间具有第二频率间 隔 (m+ l)A , 所述 Δ/表示所述第一频率间隔, 所述 m A 为保护频带间隔, 所 述 m为大于 0的分数, 所述 x、 z均为正整数。
20、 根据权利要求 19所述的发射机, 其特征在于, 所述将第 X个子带上 的最后一个 OQAM符号映射到第 z个子载波上以及将第(x+1 )个子带上的第 一个 OQAM符号映射到第( z+1 )个子载波上之后, 所述第 z个子载波和所述 第 (z+1 )个子载波之间具有第二频率间隔 (m+ l)A 通过如下方式实现:
在所述最后一个 OQAM符号和所述第一个 OQAM符号之间插入 ( k + p - 1 )个 0;
其中, 所述 k为原型滤波器的交叠因子, 所述 p为原型滤波器的带外抑制 因子。
21、 根据权利要求 16至 19中任一项所述的发射机, 其特征在于, 所述发 射机, 还包括:
保护频带间隔获取模块, 用于所述符号映射模块将每个子带上的 OQAM 符号分别映射到各个子载波上之前,根据原型滤波器的交叠因子和带外抑制因 子以及所述第一频率间隔获取所述保护频带间隔, 其中, 获取所述保护频带间 隔通过如下方式: P
G = —Af ,
K
其中, 所述 G为所述保护频带间隔, 所述 为原型滤波器的交叠因子, 所述 P为原型滤波器的带外抑制因子, 所述 Δ 为所述第一频率间隔。
22、 根据权利要求 16所述的发射机, 其特征在于, 所述发射机, 还包括: 预编码模块, 用于所述信号生成模块将所述频域信号生成 FBMC信号之前, 对所述频域信号中每个子带上的 OQAM符号进行预编码。
23、 根据权利要求 16所述的发射机, 其特征在于, 所述符号生成模块, 具体用于为同一个用户生成承载在同一个子带上的 OQAM符号。
24、 根据权利要求 16至 19中任一项所述的发射机, 其特征在于, 所述信 号生成模块, 包括:
滤波器, 用于对所述频域信号进行频域滤波;
离散傅里叶逆变换模块,用于对频域滤波后的所述频域信号进行离散傅里 叶逆变换 IDFT, 得到时域信号;
错位叠加模块, 用于对所述时域信号进行时域错位叠加,得到所述 FBMC 信号。
25、 一种接收机, 其特征在于, 包括:
信号接收模块, 用于接收 FBMC信号;
频域信号获取模块, 用于用接收到的 FBMC信号得到频域信号; 信号逆映射模块,用于根据第一频率间隔和第二频率间隔对所述频域信号 进行逆映射,得到承载在至少两个子带上的正交幅度调制 OQAM符号,其中, 所述第一频率间隔为同一个子带内的相邻子载波之间具有的频率间隔,所述第 二频率间隔为相邻两个子带之间的相邻子载波之间具有的频率间隔,所述第二 频率间隔为所述第一频率间隔和保护频带间隔之和,且所述保护频带间隔为所 述第一频率间隔的分数倍。
26、 根据权利要求 25所述的接收机, 其特征在于, 频域信号获取模块, 包括:
时域信号提取子模块, 用于对接收到的的所述 FBMC信号进行时域符号 提取, 得到时域信号;
离散傅里叶变换子模块,用于对时域符号提取得到的时域信号进行离散傅 里叶变换 DFT, 得到 DFT后的信号;
滤波器, 用于对 DFT后的信号进行频域滤波, 得到所述频域信号。
27、 根据权利要求 26所述的接收机, 其特征在于, 所述频域信号获取模 块, 还包括:
第一均衡器,用于所述滤波器对 DFT后的信号进行频域滤波之前,对 DFT 后的信号进行信道均衡。
28、 根据权利要求 25 所述的接收机, 其特征在于, 若接收到的的所述 FBMC信号为下行信号时, 所述接收机, 还包括:
频域信号筛选模块, 用于所述频域信号获取模块用接收到的 FBMC信号 得到频域信号之后,从所述频域信号中 选出映射在预置的子载波上的频域信 号;
所述信号逆映射模块,具体用于根据第一频率间隔和第二频率间隔对映射 在预置的子载波上的频域信号进行逆映射。
29、 根据权利要求 25所述的接收机, 其特征在于, 所述接收机, 还包括: 第二均衡器,用于所述信号逆映射模块根据第一频率间隔和第二频率间隔 对所述频域信号进行逆映射, 得到承载在至少两个子带上的正交幅度调制 OQAM符号之后, 对所述 OQAM符号进行信道均衡。
30、 根据权利要求 25所述的接收机, 其特征在于, 所述信号逆映射模块, 包括:
第一逆映射子模块,用于按照所述第二频率间隔从所述频域信号的第 X个 子带上提取出承载在第 X个子带上的第一个 OQAM符号;
第二逆映射子模块, 用于提取到承载在第 X个子带上的第一个 OQAM符 号之后,按照所述第一频率间隔依次从所述频域信号的第 X个子带上提取出承 载在第 X个子带上的第二个 OQAM符号直至最后一个 OQAM符号;
第三逆映射子模块, 用于按照所述第二频率间隔从所述频域信号的第
( x+1 )个子带上提取出承载在第 (x+1 )个子带上的第一个 OQAM符号;
其中, 所述 X指的是所述频域信号中的任意一个子带。
+
PCT/CN2014/084289 2014-08-13 2014-08-13 Fbmc信号的发送方法、接收方法和发射机以及接收机 WO2016023194A1 (zh)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BR112017002602A BR112017002602A2 (pt) 2014-08-13 2014-08-13 método de transmissão e método de recepção de sinal de fbmc, transmissor e receptor
EP14899710.9A EP3171563B1 (en) 2014-08-13 2014-08-13 Fbmc signal transmission method, receiving method, transmitter and receiver
RU2017107271A RU2659352C1 (ru) 2014-08-13 2014-08-13 Передатчик и приемник, способ приема и способ передачи через fbmc сигнала
PCT/CN2014/084289 WO2016023194A1 (zh) 2014-08-13 2014-08-13 Fbmc信号的发送方法、接收方法和发射机以及接收机
CN201480080893.3A CN106576092B (zh) 2014-08-13 2014-08-13 Fbmc信号的发送方法、接收方法和发射机以及接收机
CA2957836A CA2957836C (en) 2014-08-13 2014-08-13 Fbmc signal transmitting method and receiving method, transmitter and receiver
MYPI2017700418A MY192108A (en) 2014-08-13 2014-08-13 Fbmc signal transmitting method and receiving method, transmitter and receiver
KR1020177006754A KR101984151B1 (ko) 2014-08-13 2014-08-13 Fbmc 신호 전송 방법, 수신 방법, 전송기 및 수신기
JP2017507827A JP6334816B2 (ja) 2014-08-13 2014-08-13 Fbmc信号送信方法及び受信方法、送信機及び受信機
AU2014403687A AU2014403687C1 (en) 2014-08-13 2014-08-13 FBMC signal transmission method, receiving method, transmitter and receiver
US15/431,472 US10135663B2 (en) 2014-08-13 2017-02-13 FBMC signal transmitting method and receiving method, transmitter and receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/084289 WO2016023194A1 (zh) 2014-08-13 2014-08-13 Fbmc信号的发送方法、接收方法和发射机以及接收机

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/431,472 Continuation US10135663B2 (en) 2014-08-13 2017-02-13 FBMC signal transmitting method and receiving method, transmitter and receiver

Publications (1)

Publication Number Publication Date
WO2016023194A1 true WO2016023194A1 (zh) 2016-02-18

Family

ID=55303796

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/084289 WO2016023194A1 (zh) 2014-08-13 2014-08-13 Fbmc信号的发送方法、接收方法和发射机以及接收机

Country Status (11)

Country Link
US (1) US10135663B2 (zh)
EP (1) EP3171563B1 (zh)
JP (1) JP6334816B2 (zh)
KR (1) KR101984151B1 (zh)
CN (1) CN106576092B (zh)
AU (1) AU2014403687C1 (zh)
BR (1) BR112017002602A2 (zh)
CA (1) CA2957836C (zh)
MY (1) MY192108A (zh)
RU (1) RU2659352C1 (zh)
WO (1) WO2016023194A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106230757A (zh) * 2016-08-04 2016-12-14 成都极比特通信技术有限公司 基于预编码的fbmc系统实数域均衡方法
WO2018028378A1 (zh) * 2016-08-12 2018-02-15 华为技术有限公司 一种通信的方法及装置

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9553699B2 (en) * 2014-08-28 2017-01-24 Newracom, Inc. Frame transmitting method and frame receiving method
FR3032321A1 (fr) * 2015-01-30 2016-08-05 Orange Procede et dispositif de modulation de symboles complexes, procede et dispositif de demodulation et programmes d'ordinateur correspondants.
KR102299663B1 (ko) * 2015-02-24 2021-09-08 삼성전자 주식회사 이동 통신 시스템에서 동기화 방법 및 장치
KR102380179B1 (ko) * 2015-05-26 2022-03-29 삼성전자주식회사 무선 통신 시스템에서 필터 뱅크 다중 반송파 기법을 위한 필터 제어 장치 및 방법
US10798668B2 (en) * 2016-03-28 2020-10-06 Anritsu Corporation Synchronization circuit, synchronization method, signal generating device, signal generating method, and recording medium
CN108923896B (zh) * 2017-04-19 2021-03-26 上海朗帛通信技术有限公司 一种被用于寻呼的用户设备、基站中的方法和装置
CN107995141B (zh) * 2017-10-23 2020-08-04 中国人民解放军信息工程大学 一种fbmc-oqam系统的载波调制方法及装置
CN109962764B (zh) * 2017-12-26 2021-09-21 中国移动通信集团湖南有限公司 一种fbmc模块及基于fbmc模块的分组传输方法
EP3537678B1 (en) * 2018-03-08 2022-05-04 Institut Mines Telecom - IMT Atlantique - Bretagne - Pays de la Loire Pseudo-guard intervals insertion in an fbmc transmitter
US11177995B2 (en) * 2020-02-05 2021-11-16 Huawei Technologies Co., Ltd. Methods and apparatus for communicating a single carrier waveform
WO2023106448A1 (ko) * 2021-12-08 2023-06-15 포항공과대학교 산학협력단 직교 진폭 변조 필터 뱅크 다중 반송파 통신 시스템에서 낮은 자기 간섭 및 높은 주파수 효율에 도달하기 위한 송수신기, 송수신 방법 및 수신 원형 필터 설계 방법

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101272371A (zh) * 2008-02-25 2008-09-24 上海瀚讯无线技术有限公司 一种基于dft扩频广义多载波传输系统的跳频传输方法
US20110182332A1 (en) * 2010-01-25 2011-07-28 Harris Corporation Method and apparatus for high speed data transmission modulation and demodulation
CN103825862A (zh) * 2014-03-07 2014-05-28 华中科技大学 一种基于偏移正交幅度调制的滤波器组多载波方法
CN103888406A (zh) * 2014-03-28 2014-06-25 华中科技大学 一种滤波器组多载波系统的数据传输方法

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040044267A (ko) * 2002-11-20 2004-05-28 삼성전자주식회사 직교 주파수 분할 다중 접속방식 시스템에 있어서 측부엽억제신호 발생장치 및 이를 채용하는 상향링크 통신장치
US20040252772A1 (en) 2002-12-31 2004-12-16 Markku Renfors Filter bank based signal processing
CN101356757B (zh) 2006-01-10 2012-09-05 松下电器产业株式会社 多载波调制方法以及利用该方法的发送装置及接收装置
FR2928233A1 (fr) 2008-02-29 2009-09-04 France Telecom Procedes de transmission et de reception d'un signal multiporteuse comprenant un intervalle de garde, produits programme d'ordinateur, dispositifs d'emission et de reception, et signal correspondants
BRPI1006119A2 (pt) 2009-01-08 2016-02-16 Sharp Kk aparelho de transmissão, método de transmissão, sistema de comunicação, e método de comunicação
FR2951046B1 (fr) * 2009-10-02 2011-10-14 Conservatoire Nat Des Arts Et Metiers Cnam Systemes de transmission multiporteuse de donnees numeriques et procedes de transmission utilisant de tels systemes
FR2973187B1 (fr) * 2011-03-25 2013-11-15 Commissariat Energie Atomique Procede de traitement d'un signal multiporteuses a bancs de filtre pour la synchronisation par preambule
CN102904854A (zh) * 2011-07-29 2013-01-30 上海贝尔股份有限公司 一种在滤波器组多载波系统中减小峰均比的方法和装置
CN103368889B (zh) * 2012-03-29 2016-06-29 上海贝尔股份有限公司 滤波器组多载波信号发射及信道估计的方法和装置
CN104823402B (zh) * 2012-11-29 2017-07-28 Idac控股公司 一种用于在无线通信设备内执行多载波调制的方法
WO2015031075A1 (en) * 2013-08-29 2015-03-05 Interdigital Patent Holdings, Inc. Methods and apparatus for faster than nyquist rate multi-carrier modulation
FR3010269B1 (fr) * 2013-09-04 2015-10-02 Commissariat Energie Atomique Recepteur fbmc a compensation d'offset de frequence porteuse
US20160261388A1 (en) * 2013-11-25 2016-09-08 University Of Utah Research Foundation A multiple user communication network
AU2016347456B2 (en) * 2015-10-27 2018-12-13 F. Hoffmann-La Roche Ag Peptide macrocycles against acinetobacter baumannii

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101272371A (zh) * 2008-02-25 2008-09-24 上海瀚讯无线技术有限公司 一种基于dft扩频广义多载波传输系统的跳频传输方法
US20110182332A1 (en) * 2010-01-25 2011-07-28 Harris Corporation Method and apparatus for high speed data transmission modulation and demodulation
CN103825862A (zh) * 2014-03-07 2014-05-28 华中科技大学 一种基于偏移正交幅度调制的滤波器组多载波方法
CN103888406A (zh) * 2014-03-28 2014-06-25 华中科技大学 一种滤波器组多载波系统的数据传输方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP3171563A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106230757A (zh) * 2016-08-04 2016-12-14 成都极比特通信技术有限公司 基于预编码的fbmc系统实数域均衡方法
WO2018028378A1 (zh) * 2016-08-12 2018-02-15 华为技术有限公司 一种通信的方法及装置
US10756878B2 (en) 2016-08-12 2020-08-25 Huawei Technologies Co., Ltd. Communication method and communications apparatus

Also Published As

Publication number Publication date
RU2659352C1 (ru) 2018-07-03
CA2957836A1 (en) 2016-02-18
KR101984151B1 (ko) 2019-05-30
AU2014403687A1 (en) 2017-03-16
EP3171563A4 (en) 2017-07-26
CN106576092B (zh) 2019-11-19
EP3171563A1 (en) 2017-05-24
AU2014403687B2 (en) 2017-11-02
BR112017002602A2 (pt) 2018-07-17
KR20170041881A (ko) 2017-04-17
JP6334816B2 (ja) 2018-05-30
CN106576092A (zh) 2017-04-19
MY192108A (en) 2022-07-27
AU2014403687C1 (en) 2018-08-09
CA2957836C (en) 2019-06-25
US10135663B2 (en) 2018-11-20
JP2017528066A (ja) 2017-09-21
EP3171563B1 (en) 2018-11-07
US20170171010A1 (en) 2017-06-15

Similar Documents

Publication Publication Date Title
WO2016023194A1 (zh) Fbmc信号的发送方法、接收方法和发射机以及接收机
CN105612725B (zh) 用于经滤波的多载波信号的接收器和接收方法
Farhang-Boroujeny Filter bank multicarrier modulation: A waveform candidate for 5G and beyond
WO2015032313A2 (en) System and method for channel estimation for generalized frequency division multiplexing (gfdm)
EP2926494A1 (en) Reduction of spectral leakage in an ofdm system
US20140286384A1 (en) Method for equalizing filterbank multicarrier (fbmc)modulations
US11070415B2 (en) Overlap-save FBMC receiver
EP3148141B1 (en) Method, apparatus, and device for transmitting data
CN107171984A (zh) 一种异步多载波系统频域信道估计方法
CN109565679B (zh) Ofdm信号传输的复杂度降低
CN101155164B (zh) 一种dft扩频的广义多载波系统的sinr估计方法
WO2016055002A1 (en) Systems and methods for circular convolution
WO2013155908A1 (zh) 一种re检测方法及装置
JP6743327B2 (ja) 無線通信システム、無線送信装置および無線受信装置
CN107438041B (zh) 一种发送信号和接收信号的方法及装置
US9893923B2 (en) Method for transmitting and receiving QAM signal in filter bank-based multicarrier communication system, and apparatus therefor
WO2016023195A1 (zh) 导频符号的发送方法、接收方法和发射机以及接收机
TW202019139A (zh) 對多個層進行分離的方法、接收器電路和無線通訊裝置
KR101499250B1 (ko) 직교 주파수 분할 다중 전송 방식의 주파수 효율 증가 장치및 방법
CN109075884A (zh) 用于在循环脉冲形波形上传送数据的系统、设备和方法
Krishna et al. Hardware implementation of OFDM transceiver using FPGA
Garcia-Roger et al. Multicarrier Waveform Harmonization and Complexity Analysis for an Efficient 5G Air Interface Implementation
CN106899533A (zh) 多天线分集发射、多天线分集接收方法及装置
Maliatsos et al. Multicarrier Modulation Schemes—Candidate Waveforms for 5G
Medjahdi et al. Waveforms MOdels for Machine Type CommuNication inteGrating 5G Networks (WONG5) Document Number D2. 1 Critical and comparative study of waveforms in C-MTC context

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14899710

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2017507827

Country of ref document: JP

Kind code of ref document: A

Ref document number: 2957836

Country of ref document: CA

NENP Non-entry into the national phase

Ref country code: DE

REEP Request for entry into the european phase

Ref document number: 2014899710

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 2014899710

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2017107271

Country of ref document: RU

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 20177006754

Country of ref document: KR

Kind code of ref document: A

ENP Entry into the national phase

Ref document number: 2014403687

Country of ref document: AU

Date of ref document: 20140813

Kind code of ref document: A

REG Reference to national code

Ref country code: BR

Ref legal event code: B01A

Ref document number: 112017002602

Country of ref document: BR

ENP Entry into the national phase

Ref document number: 112017002602

Country of ref document: BR

Kind code of ref document: A2

Effective date: 20170208