WO2018196996A1 - Émetteur-récepteur de type à porteuse unique pour maintenir des sous-porteuses nulles - Google Patents

Émetteur-récepteur de type à porteuse unique pour maintenir des sous-porteuses nulles Download PDF

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Publication number
WO2018196996A1
WO2018196996A1 PCT/EP2017/060191 EP2017060191W WO2018196996A1 WO 2018196996 A1 WO2018196996 A1 WO 2018196996A1 EP 2017060191 W EP2017060191 W EP 2017060191W WO 2018196996 A1 WO2018196996 A1 WO 2018196996A1
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WO
WIPO (PCT)
Prior art keywords
subcarriers
matrix
data signal
multicarrier data
signal
Prior art date
Application number
PCT/EP2017/060191
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English (en)
Inventor
Traian ABRUDAN
Stepan Kucera
Holger Claussen
Original Assignee
Nokia Technologies Oy
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
Application filed by Nokia Technologies Oy filed Critical Nokia Technologies Oy
Priority to PCT/EP2017/060191 priority Critical patent/WO2018196996A1/fr
Publication of WO2018196996A1 publication Critical patent/WO2018196996A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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

Definitions

  • Wired and wireless communication is known.
  • Emerging wireless systems suggest employing visible-light communications (VLC) for transmitting data signals.
  • VLC visible-light communications
  • the intensity of light sources such as building lighting
  • VLC enables ubiquitous Gigabit per second per square meter wireless data transmission by modulating the intensity of a light source.
  • processing circuitry for processing a multicarrier data signal prior to transmitting the signal , the processing circuitry comprising: an input for receiving the multicarrier data signal; mapping circuitry operable to map the multicarrier data signal to a set of active subcarriers and to add nulls corresponding to a set of inactive subcarriers to generate a mapped multicarrier data signal; and transforming circuitry operable to generate a transformed mapped multicarrier data signal by applying a linear precoder matrix to maintain the nulls corresponding to the inactive subcarriers and encode the active subcarriers as orthogonal frequency-division multiplexed subcarriers.
  • mapping circuitry operable to map the multicarrier data signal to a set of active subcarriers and to add nulls corresponding to a set of inactive subcarriers to generate a mapped multicarrier data signal
  • transforming circuitry operable to generate a transformed mapped multicarrier data signal by applying a linear precoder matrix to maintain the nulls corresponding
  • a basic DC-biased Offset OFDM (DCO-OFDM) scheme [1] requires a bias voltage value optimization in order to ensure sufficient signal dynamic range and minimize signal clipping, but suffers from high PAPR.
  • Other modulations such as Asymmetrically Clipped Optical OFDM (ACO-OFDM) [2] and Unipolar-OFDM (U-OFDM) [5] have been proposed to overcome the high PAPR.
  • ACO-OFDM Asymmetrically Clipped Optical OFDM
  • U-OFDM Unipolar-OFDM
  • the processing circuitry may be operable to process or operate on a multicarrier data signal. Such processing may occur prior to or before transmitting the signal as a wired or wireless communication signal. In other words, the processing may prepare the signal for subsequent transmission as a wired or wireless signal. It will be appreciated that further processing may be required to produce a transmittable communication signal.
  • the processing circuitry may comprise an input which may receive the multicarrier data signal.
  • the processing circuitry may comprise mapping circuitry or logic.
  • the multicarrier data signal comprises an N subcarrier data signal
  • the set of active subcarriers comprises M active subcarriers
  • the set of inactive subcarriers comprise Z inactive subcarriers.
  • the multicarrier data signal comprises an N subcarrier data signal
  • the set of active subcarriers comprises M active subcarriers
  • the set of inactive subcarriers comprise Z inactive subcarriers.
  • the linear decoder matrix comprises a composite demodulation- decoding matrix having an identity matrix summed with a subcarrier nulling matrix.
  • the subcarrier nulling matrix comprises a matrix singular value decomposition. In one embodiment, the generating comprises generating the multicarrier data signal using 2NZ scalar operations.
  • the frequency-domain equalisation comprises single-tap frequency-domain equalisation. In one embodiment, the frequency-domain equalisation is performed by equalisation circuitry comprises an FFT matrix, a diagonal matrix and an IFFT matrix.
  • Figure 10 is a flow chart illustrating the main steps performed by the receiver of Figure 2.
  • the demodulation-decoding matrix is simply the transpose of the precoding- modulation matrix.
  • the PAPR level of the output signal is almost equal to the PAPR of the input signal (it is a quasi-single-carrier modulation) while permitting on-demand spectral blanking (unlike SC).
  • the idea of this invention is that the IFFT operation in the traditional OFDM
  • the overall computational complexity of the proposed receiver that includes single-tap channel estimation, frequency-domain channel equalization, OFDM demodulation and symbol decoding is of order of 2 N Io 3 ⁇ 4 N + 2NZ + 2M scalar operations (assuming radix-2 FFT), very similar to the conventional OFDM.
  • the amount of memory required at the receiver is the same as for the transmitter.
  • Embodiments achieve ultra-low PAPR, 3-5 dB lower than the state-of-the-art (e)U-OFDM and (e)ACO-OFDM modulations, and is just 1-3 dB above the PAPR level of SC modulation.
  • e U-OFDM
  • e ACO-OFDM modulations
  • Figure 6 illustrates that OFDM precoding scheme of embodiments outperforms the existing U-OFDM by 3-5 dB, and is just 1-3 dB above the level of single carrier modulation for 90% of time.
  • Figure 8 illustrates an amplitude spectrum of the precoded OFDM signal of
  • the scheme of embodiments exhibits half of the complexity of conventional OFDM at transmission, and slightly more than double complexity at reception.
  • the overall complexity of the proposed precoded OFDM does not exceed 50% of the complexity of conventional OFDM. This is well-justified, considering the substantial reduction in PAPR, flexibility in subcarrier nulling, and full throughput, unlike other existing schemes.
  • This complexity overhead (vs. OFDM) is negligible compared to other computationally-intensive transceiver operations used in the current and future high data rate wireless standards, such as Low Density Parity Check (LDPC) / turbo decoding.
  • LDPC Low Density Parity Check

Landscapes

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

Abstract

La présente invention concerne des circuits, des procédés et des produits-programmes informatiques. Un circuit de traitement, permettant de traiter un signal de données à porteuses multiples avant une émission du signal en tant que signal de communication, comprend : une entrée permettant de recevoir le signal de données à porteuses multiples ; des circuits de mappage pouvant servir à mapper le signal de données à porteuses multiples sur un ensemble de sous-porteuses actives et à ajouter des sous-porteuses nulles correspondant à un ensemble de sous-porteuses inactives afin de générer un signal de données à porteuses multiples mappé ; et des circuits de transformation pouvant servir à générer un signal de données à porteuses multiples mappé transformé par application d'une matrice de précodage linéaire afin de maintenir les sous-porteuses nulles correspondant aux sous-porteuses inactives et pour coder les sous-porteuses actives en tant que sous-porteuses multiplexées par répartition orthogonale de la fréquence. De cette manière, tant un signal précodé ou mappé qu'un signal modulé orthogonalement est fourni à l'aide d'une opération linéaire, ce qui réduit de manière considérable le traitement nécessaire pour produire le signal de données à porteuses multiples mappé transformé en vue d'une utilisation ultérieure en tant que signal de communication.
PCT/EP2017/060191 2017-04-28 2017-04-28 Émetteur-récepteur de type à porteuse unique pour maintenir des sous-porteuses nulles WO2018196996A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/060191 WO2018196996A1 (fr) 2017-04-28 2017-04-28 Émetteur-récepteur de type à porteuse unique pour maintenir des sous-porteuses nulles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/060191 WO2018196996A1 (fr) 2017-04-28 2017-04-28 Émetteur-récepteur de type à porteuse unique pour maintenir des sous-porteuses nulles

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WO2018196996A1 true WO2018196996A1 (fr) 2018-11-01

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020145422A1 (fr) * 2019-01-08 2020-07-16 엘지전자 주식회사 Procédé d'émission ou de réception de signal dans un système de communication sans fil et dispositif de prise en charge associé

Non-Patent Citations (8)

* Cited by examiner, † Cited by third party
Title
D. TSONEV; H. HAAS: "Avoiding spectral efficiency loss in unipolar OFDM for optical wireless communication", IEEE INT. CONF. COMMUN. (ICC, 2014, pages 3336 - 3341, XP032632184, DOI: doi:10.1109/ICC.2014.6883836
D. TSONEV; S. SINANOVIC; H. HAAS: "Novel unipolar orthogonal frequency division multiplexing (U-OFDM) for optical wireless", IEEE TH VEH. TECH. CONF. (VTC SPRING, vol. 2012, 2012, pages 1 - 5, XP032202477, DOI: doi:10.1109/VETECS.2012.6240060
FANG-MING WU; CHUN-TING LIN; CHIA-CHIEN WEI; CHENG-WEI CHEN; HOU-TZU HUANG; CHUN-HUNG HO: "Gb/s White-LED-Based Visible Light Communication Employing Carrier-Less Amplitude and Phase Modulation", IEEE PHOTON. TECH. LETT., vol. 24, no. 19, October 2012 (2012-10-01), XP011460849, DOI: doi:10.1109/LPT.2012.2210540
J. ARMSTRONG; A. LOWERY: "Power efficient optical OFDM", ELECTRON. LETT., vol. 42, no. 6, 2006, pages 370 - 372, XP006026350, DOI: doi:10.1049/el:20063636
J. B. CARRUTHERS; J. M. KAHN: "Multiple-subcarrier modulation for nondirected wireless infrared communication", IEEE J. SELECT. AREAS COMMUN., vol. SAC-14, April 1996 (1996-04-01), pages 538 - 546
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SAIED OSAMA ET AL: "Single carrier optical FDM in visible light communication", 2016 10TH INTERNATIONAL SYMPOSIUM ON COMMUNICATION SYSTEMS, NETWORKS AND DIGITAL SIGNAL PROCESSING (CSNDSP), IEEE, 20 July 2016 (2016-07-20), pages 1 - 5, XP032968147, DOI: 10.1109/CSNDSP.2016.7573947 *
Y. WANG; R. LI; Y. WANG; Z. ZHANG: "Gbps visible light communication system based on single carrier frequency domain equalization utilizing an RGB LED", OFC, vol. 3.25, 2014, pages 1 - 3, XP032633355, DOI: doi:10.1109/OFC.2014.6886663

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020145422A1 (fr) * 2019-01-08 2020-07-16 엘지전자 주식회사 Procédé d'émission ou de réception de signal dans un système de communication sans fil et dispositif de prise en charge associé

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