WO2016000766A1 - Émission et réception de multiporteuse de banc de filtres (fbmc) avec une efficacité spectrale de système accrue - Google Patents

Émission et réception de multiporteuse de banc de filtres (fbmc) avec une efficacité spectrale de système accrue Download PDF

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Publication number
WO2016000766A1
WO2016000766A1 PCT/EP2014/063977 EP2014063977W WO2016000766A1 WO 2016000766 A1 WO2016000766 A1 WO 2016000766A1 EP 2014063977 W EP2014063977 W EP 2014063977W WO 2016000766 A1 WO2016000766 A1 WO 2016000766A1
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WIPO (PCT)
Prior art keywords
section
spectral
border
resource block
payload
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PCT/EP2014/063977
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English (en)
Inventor
Zhao ZHAO
Long YI
Malte Schellmann
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Huawei Technologies Duesseldorf Gmbh
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Priority to PCT/EP2014/063977 priority Critical patent/WO2016000766A1/fr
Publication of WO2016000766A1 publication Critical patent/WO2016000766A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2649—Demodulators
    • H04L27/26534—Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/2654—Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
    • H04L27/26416—Filtering per subcarrier, e.g. filterbank multicarrier [FBMC]

Definitions

  • the invention relates to a wireless communication system based on filter-bank multi-carrier modulation (FBMC) , especially to a transmission apparatus, a reception apparatus, a transmission method and a reception method.
  • FBMC filter-bank multi-carrier modulation
  • the apparatuses and methods use a special block, resource mapping, and frame structure design.
  • FBMC Filterbank Multicarrier
  • OFDM Offset Quadrature-Amplitude Modulation
  • each FBMC subcarrier Distinctive from CP-OFDM, the symbols conveyed on each FBMC subcarrier are OQAM or literally Pulse Amplitude modulated (PAM) .
  • PAM Pulse Amplitude modulated
  • the transmitter can deploy a precoder to pre-cancel the mutual interference, however, the performance of such a precoder highly relies on the accuracy of the channel knowledge and is very
  • the state-of-the-art FBMC system faces a strong mutual interference problem between the boundary subcarriers belonging to two different user blocks.
  • This problem for FBMC system has been known for a long time, but there is so far no good solution to overcome it.
  • the best common practice seems leaving at least one subcarrier between user blocks as empty or un-used in the frame structure design, e.g. in the resource scheduling and mapping stage, which results in a substantial spectral efficiency loss.
  • the object of the invention is to provide a transmission apparatus, a reception apparatus, a
  • a first aspect of the present invention provides a
  • the transmission apparatus for generating a filter bank multicarrier FBMC signal from a payload signal.
  • the transmission apparatus comprises an offset quadrature amplitude modulator and a quadrature amplitude modulator.
  • the transmission apparatus is adapted to generate at least one resource block from a time-frequency resource grid corresponding to the payload signal, wherein each resource block is a specific spectral section for a specific time slot, and comprises one spectral mid-section and at least one spectral border-section being located at a spectral border of each resource block.
  • the offset quadrature amplitude modulator is adapted to generate the spectral mid-sections of each resource block by performing an offset quadrature amplitude modulation to a first part of the payload signal.
  • the quadrature amplitude modulator is adapted to generate the at least one spectral border section of each resource block by performing a quadrature amplitude modulation to a second part of the payload signal. It is therefore possible to prevent inter-block interference between spectral border-sections of adjacent blocks.
  • each spectral border-section comprises a payload-segment comprising a cyclic prefix CP, a payload and a cyclic suffix CS, wherein the cyclic prefix CP comprises a first portion of the payload and the cyclic suffix CS comprises a second portion of the payload.
  • the border-section comprises a zero-padding- segment comprising at least one zero-padding. It is thereby possible to use at least part of the border- section for transmitting payload resulting in an increased spectral efficiency.
  • the payload-segment and the zero-padding- segment of the respective border-section have the same length, if the length of the spectral border-section is an even number. It is thereby possible to place the payload segment of the border-section of a first resource block next to the zero-padding-segment of the border-section of a second resource block. This prevents inter-block
  • the at least one resource block comprises a first and a second spectral border-section.
  • the first spectral border-section is located before the spectral mid-section and the second spectral border- section is located after the spectral mid-section.
  • the payload-segment of the second spectral border-section of the at least one resource block is immediately adjacent to the zero-padding-segment of the first spectral border- section of a further resource block immediately adjacent to the at least one resource block.
  • the neighboring block only comprises its zero-padding-segment bordering on the payload-segment of the first resource block .
  • the spectral mid-section of the at least one resource block comprises at least one cushion- band-section being located on the at least one border of the respective spectral mid-section.
  • the transmission apparatus comprises an interference cancellation precoder being adapted to perform precoding both for said spectral cushion-band-section of the spectral mid-section at the adjacent spectral border-section of the at least one resource block. By performing this precoding, intra-block- interference between the border-section and the mid- section is compensated.
  • a second aspect of the invention provides a reception apparatus for receiving a payload signal from a filter- bank multicarrier FBMC signal comprised of at least one resource block.
  • Each resource block comprises one spectral mid-section, which is offset quadrature amplitude
  • the reception apparatus comprises an offset quadrature
  • each spectral border-section comprises a payload segment comprising a cyclic prefix CP, a payload and a cyclic suffix CS, wherein the cyclic prefix CP comprises a first portion of the payload, and the cyclic suffix CS comprises a second portion of the payload.
  • each spectral border-section comprises a zero- padding-segment comprising at least one zero-padding.
  • the payload-segment and the zero-padding- segment of the respective spectral border-section have the same length if the length of the spectral border-section is an even number. This allows for an easy inverse
  • the spectral mid-section of the at least one resource block comprises at least one cushion-band-section being located on the at least one border of the respective spectral mid-section.
  • the cushion-band-section and the adjacent border-section have their inter-block- interference cancelled by a precoder.
  • the reception apparatus comprises an equalizer for performing a frequency domain equalization of the cushion-band- section and the adjacent border-section of each block. This allows for recreating the payload signal in a high quality .
  • a third aspect of the invention a
  • the communication system comprises a first transmission apparatus, as described above, a second transmission apparatus, as described above and a reception apparatus, as described above.
  • the first transmission apparatus is adapted to transmit a first payload signal comprising a first resource block
  • the second transmission apparatus is adapted to transmit a second payload signal comprising a second resource block.
  • the first resource block and the second resource block are spectral neighbors and are transmitted simultaneously.
  • the quadrature amplitude modulator of the first transmission apparatus is adapted to generate at least one border- section of the first resource block spectrally bordering the second resource block.
  • the quadrature amplitude modulator of the second transmission block is adapted to generate at least one border-section of the second
  • the reception apparatus is adapted to receive and demodulate the first and the second resource block and regenerate the first and the second payload signal. It is therefore possible to transmit the first and second resource block directly adjacent, without wasting
  • the payload-segment of the border- section of the first resource block is placed directly adjacent to the zero-padding-segment of the border-section of the second resource block. This allows for a very efficient cancellation of inter-block interference since inter-block interference generated by the payload-segments does not negatively affect the zero-padding segments.
  • a method for generating a filter-bank multicarrier FBMC signal from a payload signal is provided.
  • the method comprises generating at least one resource block from a time-frequency resource grid corresponding to the payload signal, wherein each resource block is a specific spectral section for a specific time slot, and comprises one spectral mid-section and at least one spectral border- section being located at a spectral border of each
  • the spectral mid-section of the at least one resource block is generated by performing an offset quadrature amplitude modulation to a first part of the payload signal.
  • the at least one spectral border-section of the at least one resource block is generated by
  • each spectral border-section comprises a payload-segment comprising a cyclic prefix CP, a payload, and cyclic suffix CS, wherein the cyclic prefix CP comprises a first portion of the payload, and the cyclic suffix CS comprises a second portion of the payload.
  • Each spectral border- section furthermore comprises a zero-padding-segment comprising at least one zero-padding. It is therefore possible to use at least part of the border-section for transmitting payload, resulting in a high spectral
  • the payload-segment and the zero-padding-segment of the respective spectral border-section have the same length, if the length of the spectral border-section is an even number. This allows for a simple inverted placement of the payload-segment and the zero-padding-segment of adjacent border-sections, allowing for a simple inter-block
  • the at least one resource block comprises a first and a second spectral border-section, the first spectral border- section is located before the spectral mid-section and the second spectral border-section is located after the spectral mid-section.
  • the payload-segment of the second spectral border-section of the at least one resource block is at least immediately adjacent to the zero-padding- segment of the first spectral border-section of a further resource block immediately adjacent to the at least one resource block. Inter-block interference is thereby efficiently cancelled, since inter-block interference generated by the payload-segment does not negatively affect the zero-padding-segment, since this does not contain any useful data.
  • the spectral mid-section of the at least one resource block comprises at least one cushion-band-section being located on the at least one border of the respective spectral mid-section.
  • a precoding both for the spectral cushion-band-section of the spectral mid-section and the adjacent spectral border-section of the at least one resource block are performed. Intra-block interference between the border-section and the mid-section is thereby cancelled. This allows for a high quality of the
  • a method for receiving a payload signal from a filter-bank multicarrier FBMC signal is proposed.
  • the FBMC signal is comprises of at least one resource block.
  • Each resource block comprises one spectral mid-section, which is offset quadrature amplitude
  • the reception method comprises performing an offset quadrature amplitude demodulation of a first part of the payload signal from the mid-sections and performing a quadrature amplitude demodulation of a second part of the payload signal from the border-sections. It is therefore possible to regenerate the original payload signal in a high quality.
  • each spectral border-section comprises a payload-segment comprising a cyclic prefix CP, a payload and a cyclic suffix CS, wherein the cyclic prefix CP comprises a first portion of the payload, and the cyclic suffix CS comprises a second portion of the payload.
  • the spectral border-section comprises a zero-padding-segment
  • the payload-segment and the zero-padding-segment of the respective spectral border-section have the same length, if the length of the spectral border-section is an even number. It is thereby easily possible to place a payload-segment of a border-section of a first resource block next to the zero-padding-segment of the border- section of the second resource block allowing for an inter-block-interference cancellation.
  • the at least one resource block comprises a first and a second spectral border-section, the first spectral border-section being located before the spectral mid-section and the second spectral border-section being located after the spectral mid-section.
  • the payload-segment of the second spectral border-section of the at least one resource block is immediately adjacent to the zero-padding-segment of the first spectral border-section of a further resource block immediately adjacent to the at least one resource block. This allows for a very efficient inter-block interference cancellation .
  • the spectral mid-section of the at least one resource block comprises at least one cushion-band-section being located on the at least one border of the respective spectral mid-section.
  • the reception method comprises performing a frequency domain equalization of the border- sections and respective cushion-band-sections of the respective mid-sections. This allows for a high-quality regeneration of the payload signal.
  • a computer program comprises program code means for performing all steps according to any of the above-shown methods, if the program is executed on a computer or a digital signal processor.
  • Fig. 1 shows a first embodiment of the inventive
  • Fig. 2 shows a first exemplary communication situation
  • Fig. 3 shows a second exemplary communication
  • FIG. 4 shows a second embodiment of the invention
  • Fig. 5 shows a detail of a third embodiment of the
  • FIG. 6 shows a detail of a second embodiment of the inventive reception apparatus in a block
  • FIG. 7 shows a detail of a fourth embodiment of the
  • Fig. 8 shows an exemplary resource block configuration
  • Fig. 9 shows an exemplary payload-segment
  • Fig. 10 shows a detail of a fifth embodiment of the
  • Fig. 11 shows a detail of a third embodiment of the
  • Fig. 12 shows exemplary channel responses during an
  • Fig. 13 shows a sixth embodiment of the inventive
  • Fig. 14 shows a comparison of a performance achievable by an embodiment of the invention and a state of the art communication system
  • Fig. 15 shows a comparison of a performance of an
  • FIG. 16 shows a seventh embodiment of the inventive transmission apparatus in a block-diagram
  • Fig. 17 shows an eighth embodiment of the inventive
  • Fig. 18 shows an exemplary resource block structure
  • Fig. 19 shows a further exemplary resource block
  • Fig. 20 shows an embodiment of the inventive
  • Fig. 21 shows an embodiment of the inventive reception method in a flow diagram.
  • Fig. 1 an embodiment of the inventive transmission apparatus is shown.
  • the transmission apparatus 40
  • a payload signal 31 or a signal derived from a payload signal is provided both to the offset quadrature amplitude modulator 41 and to the quadrature amplitude modulator 41.
  • the offset quadrature amplitude modulator 41 performs an offset quadrature amplitude modulation and thereby
  • the quadrature amplitude modulator 42 generates border- sections of the resource blocks, which are located along the borders of the resource blocks adjacent to the mid ⁇ section by performing a quadrature amplitude modulation of a second part of the payload signal. The resulting mid ⁇ section and border-sections are combined. A transmission signal 32 is generated from this combined signal and transmitted .
  • a base station transmits a first block 10 to a first user and a second block 11 to a second user.
  • the first block 10 is processed through beam forming 12, while the second block 11 is process through beam forming 13.
  • Both resulting signals are precoded by a precoder 14 and transmitted through independent channels hi, h2 to the first mobile station 15 and the second mobile station 16.
  • the state of the art solution is to use a precoder for cancelling the interference between two successive user blocks 10, 11.
  • the precoder 14 relies on the real-time channel knowledge between two downlink users hi and h2.
  • the performance of this solution is very poor.
  • the interference cannot be effectively removed because the pre-knowledge of the channels hi and h2 is inaccurate at the transmitter.
  • FIG. 3 a second exemplary communication situation is shown.
  • a first user transmits a first pulse amplitude modulated block 20 to a base station 25, while a second user
  • the state of the art solution is to avoid the mutual interference between user blocks 20 and 21 by leaving at least one boundary subcarrier scO as empty, which is known as "subcarrier backoff".
  • neighbouring OQAM modulated subcarriers comprise those subcarriers which belong to the same block where the CQMB is located, and which are closely located to or adjacent to the said CQMB. These neighbouring subcarriers are named as cushion- band-section (CB) .
  • CB cushion- band-section
  • the QAM modulated symbols on CQMB may interfere with each other, since FBMC is only
  • the communication system 30 comprises a transmission apparatus 40, which comprises an offset quadrature amplitude modulator 41 and a quadrature
  • the communication system 30 comprises a reception apparatus 45, which in turn comprises an offset quadrature amplitude demodulator 46 and a quadrature amplitude demodulator 47.
  • a payload signal 31 or a signal derived from a payload signal is provided both to the offset quadrature amplitude modulator 41 and to the quadrature amplitude modulator 41.
  • the offset quadrature amplitude modulator 41 performs an offset quadrature amplitude modulation and thereby
  • the quadrature amplitude modulator 42 generates mid-sections of resource blocks, which are specific frequency sections during a specific time slot.
  • the quadrature amplitude modulator 42 generates spectral- border-sections of the resource blocks, which are located along the borders of the resource blocks adjacent to the mid-section by performing a quadrature amplitude
  • the reception apparatus 45 receives a signal 33.
  • This signal 33 or a signal derived from the signal 33 is supplied to the offset quadrature amplitude demodulator 46 and to the quadrature amplitude demodulator 47.
  • the offset quadrature amplitude modulator 46 performs and offset quadrature amplitude demodulation of the spectral-mid- sections, while the quadrature amplitude demodulator 47 performs a quadrature amplitude demodulation of the spectral-border-sections.
  • the resulting parts of the payload signal are combined to a payload signal 34, which corresponds to the original payload signal 31.
  • the proposed CQMB can be applied either at the transmitter side or at the receiver side separately, or on both sides of a communication system.
  • the transmitter side comprises amongst others, the
  • a resource mapping unit 50 is configured for mapping payload symbols together with reference symbols to the Time-Frequency resource grid according to a certain modulation order, e.g. PAM modulation orders for conventional FBMC/OQAM system.
  • a certain modulation order e.g. PAM modulation orders for conventional FBMC/OQAM system.
  • the detailed description of the Resource Mapping unit will be elaborated further regarding Fig. 7.
  • the resource mapping unit 50 depicted here corresponds to the OQAM
  • interference cancellation precoder is a special processing unit to pre-cancel the interference, which exists between the QAM modulated CQBM band and the OQAM modulated CB band.
  • the detail description of the CQMB-CB Precoder unit will be elaborated regarding Fig. 10.
  • An OQAM pre-modulation unit 52 is adapted to pre- modulate PAM modulated symbols in a way that only pure real or pure imaginary symbols are placed directly to each other, so that the real field orthogonality condition can be maintained.
  • the PAM modulated symbols such as CB and normal band symbols will be processed by this unit in the same way to conventional FBMC OQAM Pre-modulation algorithms, whereas the CQMB symbols may or may not be processed by this unit .
  • a MIMO layer-mapping/precoding unit 53 is an optional component depending on the MIMO mode support for the system.
  • An IDFT/PPN unit 54 is a component for modulating and filtering the FBMC signal.
  • FIG. 6 an embodiment of the reception apparatus is shown in a block-diagram.
  • the receiver side comprises amongst others, the following main components:
  • a PPN/DFT unit 60 is a component for de-modulating and match filtering the FBMC signal at the receiver side and transforming the signal into the frequency domain for each subcarrier.
  • a CQMB equalizer 61 is a unit for equalizing the CQMB symbols only. The detailed description of the CQMB equalizer is further explained along Fig. 11.
  • a PAM equalizer 62 is the equalizing unit for the PAM modulated subcarriers. This unit is responsible for equalize the symbols both for the mid-sections and the cushion-band-sections.
  • An OQAM post-modulation unit 63 is the counter part of OQAM pre-modulation part. It is configured to shift the cushion-band-section and spectral-mid- section symbols from pure real or pure imaginary back to pure real PAM symbols and dispose of the imaginary interference part.
  • a resource-demapping unit 64 is a unit configured for demapping the symbols in the time-frequency resource grid back to the respective transport blocks. It is the inverse operation of the Resource-Mapping unit 50 of Fig. 5.
  • FIG. 7 an embodiment of the inventive transmission apparatus is shown in a block diagram. Here, the inner working of a resource mapping unit 70, which corresponds to the resource mapping unit 50 of Fig. 5 is shown.
  • the Resource Mapping unit 70 is adapted for mapping the payload symbols to the time- frequency resource grid.
  • the resource mapping unit 70 comprises at least three sub-components: A CQMB mapping unit 71, which corresponds to the QAM Modulator 41 of Fig. 4, a CB mapping unit 72, and a Normal PAM mapping unit 73.
  • the CB mapping unit 72 and the Normal PAM mapping unit 73 correspond to the OQAM modulator 42 of Fig. 4.
  • Other implementation structures of resource mapping means can also be used as long as the function of the resource mapping can be performed as disclosed in the present invention .
  • the CQMB mapping unit 71 generates the mid-sections of the resource blocks.
  • the normal PAM mapping unit 73 generates the border-sections of the resource blocks.
  • the CB mapping unit 72 generates a cushion-band-section, which is part of the spectral-mid- section and is located along the border to the respective border section.
  • a first block 90 comprises a spectral-mid-section 105, which is comprises of a normal subcarrier 91 and a cushion-band- section 92. Moreover, the first block 90 comprises a border section 107, which is comprises of a zero-padding- segment 93 and a payload-segment 94.
  • the second block 100 is comprised of a mid-section 106, which is comprises of a normal subcarrier 101 and a cushion-band-section 102.
  • the second block 100 comprises a border-section 108, which is comprises of a zero-padding-segment 103 and a payload segment 104.
  • the normal subcarriers 91, 101 are OQAM-modulated .
  • the cushion-band-sections 92, 102 are also OQAM-modulated, but are additional interference compensated together with the border sections 107 and 108.
  • the payload-segments 94, 104 are QAM-modulated . Further details regarding the payload- segments 94, 104 are explained along Fig. 9.
  • Resource blocks 90, 100 have a length of N TTI .
  • the entirety of used blocks has a bandwidth M FFT .
  • the payload segments 104, 94 and the zero-padding-segments 93, 103 each have a length N CQ MB-
  • CQMB subcarriers are inserted into the boundary subcarriers of the adjacent two blocks. For e.g. the block no .1 and no .2. These inserted CQMBs located in the two adjacent boundary subcarriers are time-divided in the sense that block no. 1 uses the a part of the N TTI symbols, for instance, the CQMB may be the 2nd half of N TTI symbols shown in Fig. 8. The length can be
  • the CB are the subcarriers which are the direct neighbouring subcarrier to CQMB within the block. In the block, those subcarriers other than CB or CQMB are normal subcarriers.
  • Fig. 9 an exemplary payload-segment 80 is shown.
  • the payload segment 80 comprises a cyclic prefix 82 and a cyclic suffix 83, which surround a payload 81.
  • the cyclic prefix 82 corresponds to a first part of the payload 81, while the cyclic suffix 83 corresponds to a second part of the payload 81.
  • the cyclic prefix has a length of N CP1
  • the payload has a length of N body
  • the cyclic suffix 93 has a length N CP2 .
  • the cyclic prefix 82, the payload 81 and the cyclic suffix 83 each comprise QAM-modulated symbols.
  • the total length of N C pi, C p2, and N b0 d y are following the equation :
  • N CQMB N CP1 + N CP2 + N BODY
  • N C Q MB 14.
  • the symbols from index no. 2 to no. 11 are payload symbols.
  • the symbols from index 0 - 1 and 12 - 13 are the cyclic prefix 82 and the cyclic suffix 83.
  • a border-section 114 comprises a payload segment 110 and a zero-padding-segment 111. Directly adjacent to the border- section 114, a cushion-band-section 112 is depicted. These parts of the block are entered into the precoder 113.
  • the CQMB-CB precoder 113 is the unit responsible to pre- cancel the interference between CQMB and CB symbols.
  • the intra-block interference exists due to the fact that CQMB, both the cyclic prefix, the cyclic suffix and the payload are QAM modulated that the real-field orthogonality condition of FBMC is no longer fulfilled.
  • V CB and V C Q MB is the vector of original symbols before the precoder
  • V' CB and V' CQMB is the resulting vector after precoder
  • I is the identity matrix
  • ⁇ , ⁇ and ⁇ , ⁇ are the filter-bank response between the CB and CQMB subcarrier.
  • reception apparatus is shown. Here, only part of the reception apparatus is shown in a block-diagram.
  • CP1 and cyclic suffix CP2 overhead being removed according to the pre-determined construction method for the CQMB.
  • a DFT algorithm is performed to the CP-removed payload data.
  • the DFT size is the same as the body payload symbol length, for the example, the DFT size is 10.
  • a frequency domain equalization is performed after the DFT is performed, by multiplying the H* vector, which is the equivalent channel response in frequency domain.
  • the equivalent channel response is depicted in Fig. 12, where fo(t) and go(t) are the transmitter (receiver) filters on subcarrier 0, which can be longer than one symbol (e.g. length is 4-M FFT ) , M FFT is the FFT size, L ch is the channel impulse response.
  • the equivalent channel in time domain can be simply given as:
  • ho is the scalar channel gain on subcarrier 0.
  • MFFT/2 is the intrinsic filter bank response, which relies only on the prototype filter adopted for the FBMC system and its coefficients can be pre ⁇ determined and stored, for instance, in the look up table.
  • DFT( . ) is the DFT operation, (.) * is the complex conjugate.
  • an IDFT is performed by an IDFT unit 124 to change the vector back from the frequency domain to the time domain.
  • the IDFT size is identical to the DFT size used by the DFT unit 122.
  • the communication system 200 comprises a transmission apparatus 150 and a reception apparatus 170.
  • the transmission apparatus 150 comprises an offset quadrature amplitude modulator 154 and a quadrature amplitude modulator 151.
  • the transmit data symbols are firstly mapped to the corresponding CQMB part of the resource map grit as explained earlier.
  • prefix/suffix unit 152 the cyclic prefixes and suffixes are added.
  • a zero-padding-unit 153 the zero-padding is added.
  • the resulting border-sections are handed to an interference cancellation precoder 162, which cancels mutual interference between the border-section and a neighboring cushion-band-section .
  • the offset quadrature amplitude modulator 154 comprises a first path scN for normal subcarriers not part of the cushion-band-sections.
  • this path scN the transmit data symbols are firstly mapped to the corresponding part of the resource map grit as explained above.
  • the cushion-band-sections are OQAM-modulated . The results of this second path are also fed to the
  • interference cancellation precoder 162 By use of the interference cancellation precoder 162, the data symbol vectors on CQMB and the data symbol vectors on CB are jointly precoded to pre-cancel the mutual interference, as explained above. The precoded symbols are handed on to an IDFT/filter bank unit 163.
  • the OQAM-modulated symbols of the path scN are handed to this unit 163.
  • the symbols are jointly
  • the resulting signals handed on to a DAC/RF unit 164, which transforms the previously digital signal into an analog signal and transforms it into the radio frequency.
  • the resulting signals handed on to an antenna 165, which transmits the signal.
  • the signal is received by an antenna 171 of the reception apparatus 170 and handed on to an RF/ADC unit 172, which reduces the signal's frequency and transforms it to a digital signal.
  • the signal is handed on to a filter bank/DFT unit 173, which filters the signal and transforms it to the frequency domain.
  • the non-cushion-band-sections of the mid-sections are handed on to a QAM-demodulator 175, which performs a QAM-demodulation .
  • the border- sections and the cushion-band-sections of the mid-sections are handed to an equalization unit 174, which performs a frequency domain equalization removing the effects of the interference cancellation precoder 162.
  • the resulting symbols are demodulated by an offset quadrature amplitude demodulator 178.
  • the resulting symbols are combined to a payload signal.
  • the inter -block interference for proposed scheme is more than 45.25 dB lower than the payload symbol power, which is negligible for both uplink and downlink .
  • Fig. 14 the spectral efficiency resulting from an embodiment of the inventive communication system is depicted in comparison to the spectral efficiency of a state of the art system. As can be seen, the spectral efficiency of the proposed system is substantially higher.
  • the gain by the present invention is higher or lower. In case of a small number of subcarriers for each user block, the gain is higher than for a high number of subcarriers for each user block.
  • modulation e.g. PAM8 for CB or QAM64 for CQMB.
  • Fig. 16 an exemplary application of the invention is shown.
  • the proposed invention can be applied in the downlink MIMO precoded case.
  • the proposed algorithm can successfully avoid the inter-block interference between user no. 1 and no. 2 by adopting the proposed resource mapping of CQMB and CB, by adopting the proposed CQMB-CB precoder. It is especially noteworthy, that there is no wasted subcarrier between the two user blocks.
  • the proposed invention can be applied in the FBMC uplink multiple access case.
  • the proposed algorithm can successfully avoid the inter-user interference between user no. 1 and no. 2 by adopting the proposed resource mapping of CQMB and CB, by adopting the proposed CQMB-CB precoder. Also, here it is noteworthy, that there is no necessity for wasting a subcarrier between the user blocks. Also, no knowledge of the channels hi, h2 is necessary .
  • the proposed invention can also be adapted to other alternative FBMC transmissions and different prototype filters, other than the PHYDYAS filter, as long as it is OQAM modulated and utilizing the frequency-domain multiaccess for different user blocks.
  • the block has a length of N.
  • the mid-section has a spectral width of Li
  • the border-section has a spectral width of Lo .
  • the mid-section comprises a normal subcarrier 268 and a cushion-band-section 267.
  • the border- section comprises several payload-segments 261, 262 and 265 and several zero-padding-segments 260, 263, 264.
  • the zero-padding-segments 260, 263, 264 are alternatingly arranged with the payload-segments 261, 262, and 265. This allows for an increased inter-block interference
  • Possible adaptations include but are not limited to the following :
  • the length of CP on the CQMB depends on the
  • N C Q MB can be changed to other integer value from 0, 1, ... , N*N TT i
  • the subcarrier numbers LQ for CQMB, Lo l, in
  • the symbol numbers of each block N is a system parameter to adjust the frame size in time domain.
  • the CQMB-CB precoder for different frame construction methods i.e. circular convolution based, where the filter response seen from the transmitter should be circularly rotated from the cyclic prefix and cyclic suffix. It is straightforward to adjust the precoder accordingly .
  • the equalizer can be amended for different channel condition, i.e. frequency selective channels, where a more advanced equalizer other than the one described above can be used for improved CQMB receiving
  • each resource block is divided from a neighboring resource block by a border- section and a cushion-band-section.
  • a spectral mid-section of at least one resource block is generated by performing an offset quadrature amplitude modulation of a first part of a payload signal.
  • a spectral border-section of the at least one resource block is generated by performing a quadrature amplitude modulation of a second part of the payload signal.
  • a cushion-band-section is generated by performing a precoding for the cushion-band- section and an adjacent border-section.
  • a signal is generated from the at least one resource block and transmitted.
  • a first embodiment of the inventive reception method is shown.
  • a signal comprising at least one resource block is received.
  • an equalization of a cushion-band-section and a border-section is performed.
  • a quadrature amplitude demodulation of the border section is performed.
  • an offset quadrature amplitude demodulation of a mid-section and a cushion-band section is performed.
  • the payload signal is recreated from the demodulated signals.
  • the invention is not limited to the examples shown above.
  • the characteristics of the exemplary embodiments can be used in any advantageous combination.
  • the proposed invention is adopted at the TTI base to cancel the inter-block interference.
  • the example is given in an LTE-TDD downlink frame structure, where the proposed scheme is utilized to isolate each of the precoded blocks in the subframe (TTI) basis.
  • TTI subframe
  • a single processor or other unit may fulfill the functions of several items recited in the claims.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.
  • a computer program may be stored/distributed on a suitable medium, such as an optical storage medium or a solid-state medium supplied together with or as part of other

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

Abstract

Selon l'invention, un appareil d'émission (30) consiste à générer un signal de multiporteuse de banc de filtres (FBMC) (32) à partir d'un signal de données utiles (31). L'appareil d'émission (30) comprend un dispositif de modulation d'amplitude en quadrature à décalage (41) et un dispositif de modulation d'amplitude en quadrature (42). L'appareil d'émission (30) est conçu pour générer au moins un bloc de ressources à partir d'une grille de ressources temps-fréquence correspondant au signal de données utiles (31), chaque bloc de ressources étant une section spectrale spécifique pour un créneau temporel spécifique, et comprenant une section intermédiaire spectrale et au moins une section de bordure spectrale qui est située au niveau d'une bordure spectrale de chaque bloc de ressources. Le dispositif de modulation d'amplitude en quadrature à décalage (41) est conçu pour générer les sections intermédiaires spectrales de chaque bloc de ressources par réalisation d'une modulation d'amplitude en quadrature à décalage au niveau d'une première partie du signal de données utiles (31). Le dispositif de modulation d'amplitude en quadrature (42) est conçu pour générer la ou les sections de bordure spectrale de chaque bloc de ressources par réalisation d'une modulation d'amplitude en quadrature au niveau d'une seconde partie du signal de données utiles (31).
PCT/EP2014/063977 2014-07-01 2014-07-01 Émission et réception de multiporteuse de banc de filtres (fbmc) avec une efficacité spectrale de système accrue WO2016000766A1 (fr)

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Applications Claiming Priority (1)

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PCT/EP2014/063977 WO2016000766A1 (fr) 2014-07-01 2014-07-01 Émission et réception de multiporteuse de banc de filtres (fbmc) avec une efficacité spectrale de système accrue

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Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FRANK SCHAICH: "Filterbank based multi carrier transmission (FBMC) - evolving OFDM: FBMC in the context of WiMAX", IEEE EUROPEAN WIRELESS CONFERENCE - EW 2010, 12 April 2010 (2010-04-12), NJ, USA, pages 1051 - 1058, XP031688571, ISBN: 978-1-4244-5999-5 *
RENFORS MARKKU ET AL: "On the Use of Filter Bank Based Multicarrier Modulation for Professional Mobile Radio", IEEE 77TH VEHICULAR TECHNOLOGY CONFERENCE - VTC 2013, 2 June 2013 (2013-06-02), NJ, USA, pages 1 - 5, XP032547947, ISSN: 1550-2252, [retrieved on 20131222], DOI: 10.1109/VTCSPRING.2013.6692670 *

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