WO2018100428A1 - Procédé et dispositif de traitement de signal dans un système de communication - Google Patents

Procédé et dispositif de traitement de signal dans un système de communication Download PDF

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Publication number
WO2018100428A1
WO2018100428A1 PCT/IB2017/001587 IB2017001587W WO2018100428A1 WO 2018100428 A1 WO2018100428 A1 WO 2018100428A1 IB 2017001587 W IB2017001587 W IB 2017001587W WO 2018100428 A1 WO2018100428 A1 WO 2018100428A1
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WO
WIPO (PCT)
Prior art keywords
orthogonal
terminal device
signal
random
matrix
Prior art date
Application number
PCT/IB2017/001587
Other languages
English (en)
Inventor
Zhe LUO
Tao Tao
Jianguo Liu
Gang Shen
Yan Meng
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Alcatel Lucent
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Publication of WO2018100428A1 publication Critical patent/WO2018100428A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0026—Division using four or more dimensions
    • 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
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2692—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H04J11/0026—Interference mitigation or co-ordination of multi-user interference
    • H04J11/003—Interference mitigation or co-ordination of multi-user interference at the transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J13/00—Code division multiplex systems
    • H04J13/0007—Code type
    • H04J13/0055—ZCZ [zero correlation zone]
    • H04J13/0059—CAZAC [constant-amplitude and zero auto-correlation]
    • H04J13/0062—Zadoff-Chu
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present disclosure generally relates to the field of communication, and more specifically, to a method and device for signal processing in a communication system.
  • the fifth- generation (5G) mobile communication system needs to support a scenario of massive machine-type-communications (mMTC).
  • mMTC massive machine-type-communications
  • uplink small packets traffic widely exists. Because the grant-free contention based uplink transmission for small packets can reduce signaling overhead and transmission latency, it will play an important role.
  • the terminal device in case that a terminal device in idle state needs to transmit some uplink small packets, the terminal device should connect to a network device (for example, a base station device such as an eNB or a NodeB) before data transmission and obtain the uplink transmission grant. Then, the mobile communication system suffers a high signaling overhead for small packet transmission and a large connection latency.
  • the grant- free contention based uplink transmission can realize one- step uplink transmission. In other words, the terminal device transmits data using contention based uplink transmission, and the base station can recover the data.
  • a method of signal processing comprises: modulating a signal to be transmitted in a frequency domain; spreading the modulated signal with an orthogonal spreading sequence, the orthogonal spreading sequence being a non-constant amplitude sequence generated randomly; and converting the spread signal from the frequency domain to a time domain.
  • a method of signal processing comprises: obtaining information associated with a plurality of terminal devices, the information including orthogonal spreading sequences specific to the terminal devices and channel responses for terminal devices, the orthogonal spreading sequences being non-constant amplitude sequences generated randomly; receiving a signal to be processed; converting the received signal from a time domain to a frequency domain; and de-spreading the converted signal at least in part based on the information.
  • a terminal device comprises a controller and a memory including instructions.
  • the instructions when executed by the controller, cause the terminal device to implement actions, the actions comprising: modulating, in a frequency domain, a signal to be transmitted; spreading the modulated signal with an orthogonal spreading sequence, the orthogonal spreading sequence being a non-constant amplitude sequence generated randomly; and converting the spread signal from the frequency domain to a time domain.
  • a network device comprises a controller and a memory including instructions.
  • the instructions when executed by the controller, cause the network device to implement actions, the actions comprising: obtaining information associated with a plurality of terminal devices, the information including orthogonal spreading sequences specific to the terminal devices and channel responses for terminal devices, the orthogonal spreading sequences being non-constant amplitude sequences generated randomly; receiving a signal to be processed; converting the received signal from a time domain to a frequency domain; and de-spreading the converted signal at least in part based on the information.
  • Fig. 1 is a block diagram illustrating an architecture of a communication system according to an embodiment of the present disclosure
  • Fig. 2 is a flowchart illustrating a method of signal processing according to the first aspect of an embodiment of the present disclosure
  • FIG. 3 is a flowchart illustrating a method of signal processing according to the second aspect an embodiment of the present disclosure
  • Fig. 4 is a block diagram illustrating an apparatus according to the third aspect of an embodiment of the present disclosure
  • FIG. 5 is a block diagram illustrating an apparatus according to the fourth aspect of an embodiment of the present disclosure.
  • FIG. 6 is a block diagram illustrating a device according to an embodiment of the present disclosure.
  • Fig. 7 is a comparison chart of signal processing performance according to an embodiment of the present disclosure.
  • the term "network device” used herein refers to other entities or nodes having specific functions in a base station or communication network.
  • the term "base station” as used herein can represent a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a remote radio unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, or a low power node such as a pico station and a femto station, and the like.
  • NodeB or NB node B
  • eNodeB or eNB evolved NodeB
  • RRU remote radio unit
  • RH radio header
  • RRH remote radio head
  • relay or a low power node such as a pico station and a femto station, and the like.
  • terminal device or "user equipment” (UE) used herein refers to any terminal devices that can perform wireless communication with a base station or with each other.
  • a terminal device may include a mobile terminal (MT), a subscriber station (SS), a portable subscriber station (PSS), a mobile station (MS), or an access terminal (AT), and the above devices mounted on a vehicle.
  • MT mobile terminal
  • SS subscriber station
  • PSS portable subscriber station
  • MS mobile station
  • AT access terminal
  • NOMA non-orthogonal multi-user access
  • SCMA sparse code multiple access
  • RSMA resource spread multiple access
  • SCMA sparse code multiple access
  • SCMA sparse code multiple access
  • RSMA resource spread multiple access
  • SCMA and PDMA sparse code multiple access SCMA and pattern division multiple access PDMA schemes are obtained based on the observation of the sum of data of a plurality of terminal devices in each orthogonal resource, namely,
  • N is an integer which denotes the number of receiving antennae.
  • N is an integer which denotes the number of receiving antennae.
  • the matrix H cannot be converted by the receiver into a block diagonal matrix, which implies that the receiver based on the message-passing algorithm (MPA) cannot work efficiently.
  • the base station is equipped with a large number of antennae.
  • supporting spatial multiplexing will dramatically increase the transmission capacity for each active terminal device and the maximum number of terminal devices that are active simultaneously.
  • pre-coding cannot be realized and thus, spatial multiplexing with pre-coding cannot be supported. Therefore, to support spatial multiplexing in case of pre-coding, dense spreading for data signals is preferred.
  • the method of the present disclosure considers an uplink transmission scenario, where each terminal device has a single transmission antenna and each network device (such as an eNB) has a large number of receiving antennae.
  • each network device such as an eNB
  • the terminal device can be considered as a plurality of virtual terminal devices, each of the virtual terminal devices having a single antenna.
  • orthogonal spreading sequences and spatial multiplexing methods of the present disclosure can distinguish different data of different terminal devices.
  • a large number of terminal devices transmit data in the same resource. Namely, there is a high overloading factor.
  • the eNB distinguishes data of different terminal devices with spatial channels.
  • Fig. 1 is a block diagram illustrating a communication system 100 according to the embodiments of the present disclosure.
  • the communication system 100 comprises a transmitter 110, a channel 120, and a receiver 130.
  • the transmitter 110 can be a terminal device and the receiver 130 can be a base station device, such as an eNB or a NodeB.
  • a signal to be transmitted is modulated in a frequency domain.
  • the modulated signal is spread with orthogonal spreading sequence which is a randomly generated non-constant amplitude sequences.
  • the spread signal is converted from the frequency domain into a time domain.
  • information associated with a plurality of terminal devices is obtained.
  • the information includes an orthogonal spreading sequence specific to a terminal device and a channel response for the terminal device.
  • the orthogonal spreading sequence is a randomly generated non-constant amplitude sequence.
  • the signal to be processed is received from channel 120.
  • the received signal is converted from the time domain into the frequency domain.
  • the converted signal is de-spread at least partially based on the information.
  • FIG. 2 is a flowchart illustrating a method 200 of signal processing by a transmitter 110 in a communication system according to an embodiment of the present disclosure.
  • the method 200 for instance, can be implemented by the transmitter 110. It shall be appreciated that method 200 may further comprise additional actions and/or omit the shown actions.
  • the scope of the solution described in the present disclosure is not limited in this regard.
  • a signal to be transmitted is modulated in the frequency domain.
  • the manner of modulation may comprise quadrature phase shift keying (QPSK), quadrature amplitude modulation (QAM), and so on.
  • QPSK or QAM modulation may comprise serial-to-parallel conversion of the signal to be transmitted and symbol mapping.
  • QAM modulation in the present disclosure may be implemented in various orders, such as 64QAM.
  • the modulation manner in embodiments of the present disclosure is not limiting. It is possible to utilize various manners of modulation to modulate the signal to be transmitted.
  • the modulated signal is spread with an orthogonal spreading sequence which is a randomly generated non-constant amplitude sequence.
  • the transmitter 110 can spread the modulated signal in such a manner that a unitary matrix specific to the terminal device can be generated based on a random matrix, and that the unitary matrix can be utilized to spread the modulated signal.
  • the unitary matrix is only a form of random orthogonal matrices and in the present disclosure, it is only used for illustrative purpose.
  • an orthogonal spreading sequence for data symbols of a terminal device can be selected from the unitary matrix.
  • An orthogonal spreading sequence for the data symbol can also be determined directly with data symbols of the terminal device, the orthogonal spreading sequence being in the unitary matrix.
  • a baseband signal can be generated through the orthogonal spreading sequence selected in the present disclosure.
  • the baseband signal can be an OFDM symbol.
  • a data signal occupies one or more continuous or non-continuous subcarriers of the OFDM symbol.
  • a plurality of terminal devices can transmit their respective baseband signals within the same time frequency resource or resource region, the time frequency resource being a physical resource block (PRB).
  • PRB physical resource block
  • the spreading process is illustrated herein. For example, based on a spreading sequence
  • N denotes the spreading length for OFDM.
  • a plurality of spread signals should be allocated to orthogonal frequency division multiplexing subcarriers. For the selected spreading sequence [Si > S 2 > S N ] 5
  • the spreading sequence can be divided into a plurality of portions, and each portion is transmitted on an OFDM symbol.
  • the spreading sequence [Si , S 2 , S N can be divided into two portions, namely, [Si ⁇ , S 2 > ⁇ ⁇ ⁇ ⁇ > S N/2 ⁇ an d [ ⁇ /2+1 ' ⁇ /2+2 ' ⁇ ⁇ ⁇ ' ⁇ ] , where N is an even number, and the length of the spreading sequence for the OFDM symbol is N/2.
  • a random orthogonal matrix it is necessary to obtain the identification and/or transmission parameter of the terminal device as a seed. Then, based on the obtained seed, a random matrix is generated using a pseudo-random algorithm. In some embodiments, a unitary matrix is generated by performing singular value decomposition (SVD) to the random matrix.
  • SSVD singular value decomposition
  • the identification of the terminal device comprises international mobile equipment identity (IMEI).
  • the transmission parameter comprises an orthogonal frequency division multiplexing symbol number or an sub-frame number.
  • the identification of the terminal device may further comprise a user name.
  • an identifier to identify the terminal device by other parties can also be used as a seed to generate the random matrix.
  • the orthogonal frequency division multiplexing symbol number is employed, as the obtained orthogonal spreading sequence is unique for the symbol, the orthogonal spreading sequence for the number of the symbol can be obtained directly without a selection process.
  • the orthogonal spreading sequence can be a non-constant amplitude sequence.
  • the orthogonal spreading sequence differs from a Zadoff-Chu (ZC) sequence which has constant amplitude.
  • ZC Zadoff-Chu
  • the present disclosure does not require the orthogonal spreading sequence to be a constant amplitude sequence. That is to say, items in the sequence are not required to have a normalized absolute value.
  • the flexibility of the generated orthogonal spreading sequence can be improved, so as to reduce limitations for system design.
  • the signals received at receiver 130 can be distinguished effectively. Collision between different signals of the same terminal device and corresponding signals of different terminal devices can be avoided. It should be appreciated that the orthogonal spreading sequences used between different signals of the same terminal device are orthogonal to each other, and thus, can be distinguished effectively at receiver 130.
  • the spreading sequences utilized between different terminal devices are not necessarily orthogonal. That is, at receiver 130, signals of different terminal devices cannot be distinguished only by spreading sequences, but further by spatial channels. Therefore, the method employed in the present disclosure can also be called semi-orthogonal spreading sequence method.
  • the spread signal is converted from the frequency domain to the time domain.
  • IFFT fast Fourier transform
  • IFFT fast Fourier transform
  • Fig. 3 is a flowchart illustrating a method 300 of signal processing by a receiver in a communication system according to the embodiments of the present disclosure.
  • method 300 for instance, can be implemented by the receiver 130. It should be appreciated that method 300 may further comprise additional steps not shown and/or omit the shown steps. The scope of the subject matter described herein is not limited in this regard.
  • information associated with a plurality of terminal devices is obtained.
  • the obtained associated information comprises an orthogonal spreading sequence specific to a terminal device and a channel response for the terminal device.
  • the orthogonal spreading sequence is a non-constant amplitude sequence generated randomly.
  • obtaining information associated with a plurality of terminal devices comprises detecting a pilot signal for the terminal device and obtaining an orthogonal spreading sequence and a channel response using the pilot signal. For the plurality of terminal devices for which information needs to be obtained, the orthogonal spreading sequence specific for each of the plurality of terminal devices and the channel response for each terminal device should be obtained.
  • the signal to be processed is received.
  • the signal can be received, for instance, using a plurality of antennae.
  • the received signal can be pre-processed, for example, by making it pass through a filter.
  • a signal that is more suitable for subsequent processing can be provided.
  • the amplification of the signal can significantly reduce the demand on sensitivity for subsequent signal processing modules.
  • the received signal is converted from the time domain to the frequency domain.
  • fast Fourier transform IFFT
  • IFFT fast Fourier transform
  • the converted signal can be de-spread at least partially based on the obtained information.
  • the input utilized in de-spreading can be seen as a matrix. Each line in the matrix represents a modulated spreading sequence with data information and channel response of the antenna. Each column represents values of a plurality of antennae received on the same subcarrier. For instance, the input matrix can be written as:
  • R denotes the number of receiving antennae
  • N denotes the length of spreading sequence
  • M denotes the number of active terminal devices
  • h i j m denotes the channel response from the terminal device m to the receiving antenna i at the subcarrier j
  • ry denotes input matrix element for antenna i at the subcarrier j
  • K m denotes the number of constellation symbols for the terminal device m
  • X m ,k denotes the k th constellation symbol
  • the estimated value of a constellation symbol X m k can be calculated as or de-spread as:
  • the asterisk (*) in equation (4) represents plural conjugation, and (k, m) and (k' , m') are utilized to distinguish different elements represented with the same symbols.
  • the first item ( s m,j )* at the rightmost side of the equation (4) has high energy,
  • signals are processed using a successive interference cancellation receiver.
  • data of the terminal device with the strongest energy are de-modulated.
  • the de-modulated data may be checked and restored with a forward error correction FEC to improve performance. Then, the signal after FEC coding is output to a next processing device.
  • Fig. 4 is a block diagram illustrating an apparatus 400 according to the third aspect of an embodiment of the present disclosure. It should be appreciated that apparatus 400 can be implemented as a terminal device.
  • the apparatus 400 comprises a modulation unit 410, a spreading unit 420, and a frequency-time converting unit 430.
  • the modulation unit 410 is configured to modulate, in a frequency domain, a signal to be transmitted.
  • the spreading unit 420 is configured to spread the modulated signal using an orthogonal spreading sequence.
  • the orthogonal spreading sequence is a non-constant amplitude sequence generated randomly.
  • the frequency-time converting unit 430 is configured to convert the spread signal from the frequency domain to the time domain.
  • the spreading unit 420 may comprise a random orthogonal matrix generating sub-unit and a random orthogonal matrix spreading sub-unit.
  • the random orthogonal matrix generating sub-unit is configured to generate random orthogonal matrices specific to terminal devices based on the random matrix.
  • the random orthogonal matrix spreading sub-unit is configured to spread modulated signals with the random orthogonal matrix.
  • the random orthogonal matrix generating sub-unit comprises an obtaining sub-unit and a random orthogonal matrix generating sub-unit.
  • the obtaining sub-unit is configured to obtain identifiers and/or transmission parameter of the terminal device.
  • the random orthogonal matrix generating sub-unit is configured to generate, based on the obtained identifiers and/or transmission parameter of the terminal device, random orthogonal matrices using a pseudo-random algorithm.
  • the identifiers of the terminal device comprise international mobile equipment identity; and the transmission parameter comprises orthogonal frequency division multiplexing symbol number or sub-frame number.
  • the random orthogonal matrix is a unitary matrix; and the random orthogonal matrix generating sub-unit comprises a singular value decomposing sub-unit.
  • the singular value decomposing sub-unit is configured to perform singular value decomposition to the random matrix to generate a unitary matrix.
  • the apparatus 400 further comprises a resource distributing unit.
  • the resource distributing unit is configured to transmit a plurality of modulated signals of the terminal device on the same physical resources.
  • the apparatus 400 further comprises a segmenting unit configured to segment the orthogonal spreading sequence into at least one part. Each portion in at least one part is transmitted on an orthogonal frequency division multiplexing symbol.
  • the apparatus 400 further comprises a distributing unit.
  • the distributing unit is configured to distribute the spread signal to the orthogonal frequency division multiplexing subcarriers.
  • Fig. 5 is a block diagram illustrating an apparatus 500 according to the fourth aspect of an embodiment of the present disclosure. It can be appreciated that the apparatus 500 can be implemented as a network device.
  • the apparatus 500 comprises an information obtaining unit 510, a receiving unit 520, a time-frequency converting unit 530, and a de-spreading unit 540.
  • the information obtaining unit 510 is configured to obtain information associated with the terminal device.
  • the information including an orthogonal spreading sequence specific to a terminal device and a channel response for the terminal device.
  • the orthogonal spreading sequence is a randomly generated non-constant amplitude sequence.
  • the receiving unit 520 is configured to receive a signal to be processed.
  • the time-frequency converting unit 530 is configured to convert the received signal from the time domain to the frequency domain.
  • the de-spreading unit 540 is configured to de-spread the converted signal at least partially based on the orthogonal spreading sequence.
  • the orthogonal spreading sequence of the de- spreading unit 540 for de- spreading the signal is a non-constant amplitude sequence.
  • the information obtaining unit 510 further comprises a pilot detection sub-unit and a pilot processing sub-unit.
  • the pilot detection sub-unit is configured to detect pilot signals for the terminal device.
  • the pilot processing sub-unit is configured to obtain, using a pilot signal, an orthogonal spreading sequence and a channel response.
  • the apparatus 500 further comprises a successive interference cancellation receiver configured to process the converted signal.
  • apparatus 400 and apparatus 500 are not shown in Fig. 4 and Fig. 5. However, it is to be understood that various features as described with reference to Figs. 1-5 are likewise applicable to apparatus 400 and apparatus 500. Besides, various units in apparatus 400 and apparatus 500 may be hardware modules or software modules. For example, in some embodiments, the apparatus 400 and apparatus 500 may be partially or completely implemented using software and/or firmware, for example, implemented as a computer program product embodied on a computer readable medium.
  • the apparatus 400 and apparatus 500 may be partially or completely implemented based on hardware, for example, an integrated circuit (IC) chip, an application specific integrated circuit (ASIC), a system on chip (SOC), a field programmable gate array (FPGA), and so on.
  • IC integrated circuit
  • ASIC application specific integrated circuit
  • SOC system on chip
  • FPGA field programmable gate array
  • Fig. 6 is a schematic block diagram of an example device 600 suitable for implementing embodiments of the present disclosure.
  • the device 600 can be used to implement the network device and/or to implement the terminal device.
  • the device 600 comprises a controller 610 which controls the operations and functions of device 600.
  • the controller 610 can implement various operations by means of instructions 630 stored in a memory 620 coupled thereto.
  • the memory 620 can be any proper type adapted to the local technical environment and be implemented with any proper data storage technology, including but not limited to, a semiconductor-based storage device, a magnetic storage device and system and an optical storage device and a system.
  • Fig. 6 only illustrates one memory unit, multiple physically different memory units may exist in device 600.
  • the controller 610 may be any proper type adapted to the local technical environment, comprising, but not limited to, one or more of a general computer, a dedicated computer, a micro-controller, a digital signal controller (DSP) and one or more of a controller-based multi-core controller architecture.
  • the device 600 may also comprise a plurality of controllers 610.
  • the controller 610 may be coupled with a transceiver 640 which can achieve reception and transmission of information by means of one or more antennae 650 and/or other components.
  • the first method is the "random" method according to the present disclosure.
  • a vector from the unitary matrix is selected as the spreading sequence for the terminal device m; and the unitary matrix can be obtained through singular value decomposition.
  • the second method is based on "ZC" sequence whose length is 71.
  • the non-stop cyclic shifts are used as spreading sequences for the terminal device; and different roots are used to generate semi- orthogonal spreading sequences.
  • the modulated spreading sequences are mapped into six successive physical resource blocks, where one resource block has 6x12 sub-carriers. For the traditional uplink transmission, six terminal devices can utilize these resources for operation.
  • Fig. 7 illustrates an error bit rate BER in case that no forward error correction FEC is performed.
  • a specially designed ZC-based spreading sequence is compared with the orthogonal spreading sequence proposed in the present disclosure, where different numbers of receiving antennae and different overloading factors are used.
  • the signal-to-noise ratio SNR for each spreading sequence ranges from -5dB to 5dB; and the maximum time difference between receiving signals of different terminal devices is 66.7 ⁇ 8.
  • each terminal device has a single antenna and each eNB has a plurality of receiving antennae.
  • the number of receiving antennae is used as a value of the lateral axis.
  • the signal waveform of the orthogonal spreading sequence of the present disclosure can support greater overloading factors with the assistance of massive receiving antennae, for instance, can reach 1600%.
  • the overloading factors of NOMA scheme without using spatial multiplexing normally can reach 150%-400%.
  • the spreading sequence generated randomly has better performance than ZC spreading sequence designed dedicatedly.
  • Some embodiments of the present disclosure employ spreading sequences and spatial channels to discriminate data of the terminal device. Compared with the NOMA scheme, the combination of spreading sequences and spatial channels can increase the supported overloading factors significantly.
  • the spreading sequences in the present disclosure are a vector of the unitary matrix generated randomly.
  • the spreading sequences are plural and have non-uniform absolute values.
  • the orthogonality of short spreading sequences designed dedicatedly will be affected accordingly. Besides, because the number of potential spreading sequences is large enough to produce spreading sequences generated randomly, the collision probability of spreading sequences will decline correspondingly As the spreading sequences utilized by different terminal devices are non-orthogonal, the interference between users is inhibited through spatial channels.
  • the spreading sequences employed by data of the same terminal device are orthogonal, so as to reduce interference from the user itself.
  • a plurality of terminal devices can transmit data of different sizes to the eNB.
  • embodiments of the present disclosure can be implemented in software, hardware, or a combination thereof.
  • the hardware part can be implemented by a special logic; the software part can be stored in a memory and executed by a suitable instruction execution system such as a microprocessor or special purpose hardware.
  • a suitable instruction execution system such as a microprocessor or special purpose hardware.
  • the above device and method may be implemented with computer executable instructions and/or in processor-controlled code, for example, such code is provided on such as a programmable memory or a data bearer such as an optical or electronic signal bearer.

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  • Computer Networks & Wireless Communication (AREA)
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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de traitement de signal dans un système de communication. La présente invention utilise des séquences d'étalement orthogonales et quasi-orthogonales, et des canaux spatiaux, pour différencier des données d'un dispositif terminal. Du fait même que les séquences d'étalement utilisées par des données du même dispositif terminal sont orthogonales, un brouillage émanant de l'utilisateur lui-même est éliminé. Du fait même que des séquences d'étalement utilisées par différents dispositifs terminaux sont quasi-orthogonales, un brouillage entre utilisateurs est empêché via des canaux spatiaux. Par rapport à un autre schéma d'accès multi-utilisateur non orthogonal, la présente invention augmente le facteur de surcharge supporté en combinant les séquences d'étalement orthogonales et les canaux spatiaux.
PCT/IB2017/001587 2016-11-29 2017-11-28 Procédé et dispositif de traitement de signal dans un système de communication WO2018100428A1 (fr)

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CN201611073505.6A CN108123903B (zh) 2016-11-29 2016-11-29 通信系统中的信号处理方法和设备

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