WO2017092697A1 - Procédé et dispositif de traitement de signal de communication dans un système de communication - Google Patents

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

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Publication number
WO2017092697A1
WO2017092697A1 PCT/CN2016/108254 CN2016108254W WO2017092697A1 WO 2017092697 A1 WO2017092697 A1 WO 2017092697A1 CN 2016108254 W CN2016108254 W CN 2016108254W WO 2017092697 A1 WO2017092697 A1 WO 2017092697A1
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Prior art keywords
subcarriers
dft
data sequence
mapping
symbol
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PCT/CN2016/108254
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English (en)
Chinese (zh)
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任海豹
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华为技术有限公司
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    • 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
    • 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
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/262—Reduction thereof by selection of pilot symbols
    • 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
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • Embodiments of the present invention relate to the field of communications, and in particular, to a method and apparatus for processing a communication signal in a communication system.
  • Broadband communication systems in order to combat frequency-domain selective fading due to multipath, generally divide the entire system bandwidth into multiple sub-bands, each sub-band can be considered as flat fading, so that the receiver can be performed by a simple linear frequency domain equalizer. Frequency domain equalization and high reception performance.
  • a system in which a wideband signal is divided into a plurality of narrowband signals in the frequency domain for transmission and reception is referred to as a multicarrier system.
  • the Orthogonal Frequency Division Multiple Access (OFDMA) system is a typical multi-carrier system.
  • PAPR Peak to Average Power Ratio
  • the wireless system may use the wireless spectrum of higher frequency points.
  • the use of high frequency will make the wireless channel fading large.
  • Embodiments of the present invention provide a method and apparatus for processing a communication signal in a communication system, which can solve the problem of a high peak-to-average power ratio when transmitting information in a communication system.
  • a method for processing a communication signal in a communication system comprising: performing discrete Fourier transform (DFT) processing on the input data to obtain a DFT data sequence;
  • DFT discrete Fourier transform
  • the DFT data sequence and the pilot sequence are orthogonally frequency division multiplexed in the same symbol.
  • the data sequence subjected to the discrete Fourier transform process and the pilot sequence are orthogonally frequency division multiplexed in the same symbol, which can solve the transmission in the communication system.
  • the peak-to-average power ratio of the information is high, and the transmission overhead of the pilot can be reduced.
  • the performing orthogonal frequency division multiplexing on the DFT data sequence and the pilot sequence in the same symbol comprises: following the pilot sequence The manner of distributed mapping is mapped to K subcarriers among the M subcarriers in the symbol, K is a positive integer less than or equal to MN, M is the number of effective subcarriers in the symbol, and N is the The number of points processed by the DFT; mapping the DFT data sequence to N subcarriers of the M subcarriers within the symbol that are different from the K subcarriers.
  • the mapping the DFT data sequence to the N sub-carriers of the M sub-carriers in the symbol that are different from the K sub-carriers Transmitting, on the carrier, the phase rotation of the DFT data sequence and mapping to the N subcarriers, wherein a phase rotation factor of the phase rotation is S is the number of the subcarrier, and T is the number of points of the Inverse Fast Fourier Transform ("IFFT") in the communication system.
  • IFFT Inverse Fast Fourier Transform
  • the method further includes: sending sampling point shift indication information, where the sampling point shift indication information indicates that the DFT data is performed. Phase rotation processing.
  • the pilot sequence is mapped to K subcarriers of the M subcarriers in the symbol according to a distributed mapping manner.
  • the method includes: mapping the pilot sequence to the K subcarriers according to how every L subcarriers are mapped to one subcarrier, where L is a positive integer greater than or equal to 1.
  • the value of N is M/2.
  • a method of processing a communication signal in a communication system comprising: converting a received signal into a frequency domain signal, the received signal comprising a discrete Fourier transform (Discrete Fourier) Transform (referred to as "DFT") data sequence and pilot sequence, the DFT data sequence is a DFT processed data sequence, and the DFT data sequence and the pilot sequence are orthogonally frequency-divided in the same symbol Determining channel estimation information according to the pilot sequence; performing demodulation processing on the DFT data sequence according to the channel estimation information.
  • DFT discrete Fourier transform
  • the DFT data sequence and the pilot sequence are orthogonally frequency division multiplexed in the same symbol, including: the pilot sequence is distributed according to a distributed mapping The manner is mapped to K subcarriers among the M subcarriers in the symbol, K is a positive integer less than or equal to MN, M is the number of effective subcarriers in the symbol, and N is the DFT processing a number of points; the DFT data sequence is mapped on N subcarriers of the M subcarriers within the symbol that are different from the K subcarriers.
  • the DFT data sequence is mapped to N subcarriers different from the K subcarriers among M subcarriers in the symbol
  • the method includes: the DFT data sequence is phase-rotated and mapped to the N subcarriers, wherein a phase rotation factor of the phase rotation is Where S is the number of the subcarrier, and T is the Inverse Fast Fourier Transform (abbreviated as "IFFT") or the Inverse Discrete Fourier Transform (Inverse Discrete Fourier Transform) in the communication system. "IDFT”) points.
  • IFFT Inverse Fast Fourier Transform
  • IDFT Inverse Discrete Fourier Transform
  • the demodulating the DFT data sequence according to the channel estimation information includes:
  • the method further includes: receiving sampling point shift indication information, where the sampling point shift indication information indicates the DFT data sequence Phase rotation processing was performed.
  • the pilot sequence is mapped to K subcarriers of the M subcarriers in the symbol according to a distributed mapping manner, including The pilot sequence is mapped to the K subcarriers in such a manner that every L subcarriers are mapped to one subcarrier, and L is a positive integer greater than or equal to 1.
  • N In conjunction with the second aspect and the above implementation thereof, in another implementation of the second aspect, N The value is M/2.
  • a third aspect provides a method for processing a communication signal in a communication system, comprising: performing a N-point Discrete Fourier Transform (DFT) processing on the first data to obtain a first DFT data sequence.
  • the first data corresponds to the first group of user equipments, where N is less than M, M is the number of valid subcarriers included in the system bandwidth of the communication system, and M is a positive integer greater than 1;
  • DFT Discrete Fourier Transform
  • data of two sets of user equipments is subjected to independent discrete Fourier transform processing and subcarrier mapping to ensure that two groups of users transmit independently, thereby, each group of users can Independently perform multiple input and multiple output processing to obtain diversity, multiplexing, and array gain, and reduce the peak-to-average power ratio when transmitting information in a communication system.
  • the performing the orthogonal frequency division multiplexing on the first DFT data sequence and the second DFT data sequence in the same symbol includes: Mapping the first DFT data sequence to N subcarriers of the M subcarriers in the symbol according to a distributed mapping manner; mapping the second DFT data sequence to M subcarriers in the symbol On the K subcarriers of the other subcarriers other than the N subcarriers.
  • the K subcarriers of the other subcarriers include: phase-rotating the second DFT data sequence and mapping to the other subcarriers of the M subcarriers in the symbol except the N subcarriers K subcarriers; wherein the phase rotation of the phase rotation is S is the number of the subcarrier, and T is the number of points of the Inverse Fast Fourier Transform ("IFFT") in the communication system.
  • IFFT Inverse Fast Fourier Transform
  • the method further includes: sending sampling point shift indication information, where the sampling point shift indication information indicates the second DFT data The sequence is phase rotated.
  • the sending the sampling point shift indication information includes: transmitting a physical downlink control channel PDCCH information, where the PDCCH information includes the sampling point Shift indication information.
  • the PDCCH information further includes at least one of the following information: modulation and coding policy level information, user equipment group information, and data in DFT Location information in the middle.
  • the value of N is M/2.
  • a fourth aspect provides a method for processing a communication signal in a communication system, comprising: converting a received signal into a frequency domain signal, wherein the received signal includes Discrete Fourier Transform ("DFT") data.
  • DFT Discrete Fourier Transform
  • a sequence the DFT data sequence including a first DFT data sequence after the first data corresponding to the first group of user equipments is processed by the N-point DFT and the second data corresponding to the second group of user equipments is processed by the K-point DFT a second DFT data sequence, the first DFT data sequence and the second DFT data sequence are orthogonally frequency division multiplexed in the same symbol, wherein N is less than M, K is less than or equal to MN, and M is The system bandwidth of the communication system includes the number of effective subcarriers; and the DFT data sequence is demodulated according to channel estimation information.
  • DFT Discrete Fourier Transform
  • the first DFT data sequence and the second DFT data sequence are orthogonally frequency division multiplexed in the same symbol, including: the first DFT The data sequence is mapped in a distributed mapping manner on N subcarriers of the M subcarriers within the symbol; the second DFT data sequence is mapped among the M subcarriers in the symbol except the N subcarriers On the other subcarriers of the K subcarriers.
  • the second DFT data sequence is mapped to the M subcarriers in the symbol except the N subcarriers
  • the K subcarriers in the subcarriers include: the second DFT data sequence is phase rotated and mapped to the N subcarriers, wherein the phase rotation of the phase rotation is Where S is the number of the subcarrier, and T is the Inverse Discrete Fourier Transform (IDFT) point or the Inverse Fast Fourier Transform (referred to as Inverse Fast Fourier Transform) in the communication system. For "IFFT" points.
  • the demodulating the DFT data sequence according to the channel estimation information includes:
  • the method further includes: receiving sampling point shift indication information, where the sampling point shift indication information indicates the second DFT data The sequence is phase rotated.
  • the first DFT data sequence is mapped to N subcarriers of the M subcarriers in the symbol according to a distributed mapping manner.
  • the method includes: the first DFT data sequence is mapped to the N subcarriers in a manner that every L subcarriers are mapped to one subcarrier, and L is a positive integer greater than or equal to 1.
  • the receiving the sampling point shift indication information includes: receiving a physical downlink control channel PDCCH information, where the PDCCH information includes the sampling point Shift indication information.
  • the PDCCH information further includes at least one of the following information: modulation and coding policy level information, user equipment group information, and data in DFT Location information as described in .
  • the value of N is M/2.
  • an apparatus comprising: a processor and a memory, the processor and the memory being connected by a bus system, the memory is for storing instructions, and the processor is configured to execute instructions stored by the memory, The apparatus is caused to perform the method of any of the first aspect or the first aspect of the first aspect described above.
  • an apparatus including: a processor, a memory, and a receiver, the processor, the memory, and the receiver being connected by a bus system, the memory for storing instructions, the processor The instructions stored in the memory are executed to control the receiver to receive a signal such that the apparatus performs the method of any of the second aspect or the second aspect of the second aspect.
  • an apparatus including: a processor and a memory, the processor and the The memory is connected by a bus system for storing instructions for executing the instructions stored by the memory, such that the apparatus performs the method of any of the above third or third possible implementations .
  • an apparatus comprising: a processor, a memory, and a receiver, wherein the processor, the memory, and the receiver are connected by a bus system, the memory is configured to store an instruction, The processor is operative to execute the memory stored instructions to control the receiver to receive a signal such that the apparatus performs the method of any of the possible implementations of the fourth aspect or the fourth aspect.
  • a ninth aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of the first aspect or any of the possible implementations of the first aspect.
  • a computer readable medium for storing a computer program comprising instructions for performing the method of any of the second aspect or any of the possible implementations of the second aspect.
  • a computer readable medium for storing a computer program comprising instructions for performing the method of any of the third aspect or any of the possible implementations of the third aspect.
  • a twelfth aspect a computer readable medium for storing a computer program, the computer program comprising instructions for performing the method of any of the fourth or fourth aspect of the fourth aspect.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of an internal structure of a base station and a user equipment in the application scenario described in FIG. 1;
  • FIG. 3 is a schematic flowchart of a method of processing a communication signal in a communication system according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a method for processing a communication signal in a communication system according to an embodiment of the present application
  • FIG. 5 is a schematic flowchart of a method of processing a communication signal in a communication system according to another embodiment of the present invention.
  • FIG. 6 is a schematic flowchart of a method for processing a communication signal according to another embodiment of the present application.
  • FIG. 7 is a schematic block diagram of an apparatus in accordance with an embodiment of the present invention.
  • FIG. 8 is a schematic block diagram of an apparatus in accordance with another embodiment of the present invention.
  • FIG. 9 is a schematic block diagram of an apparatus in accordance with still another embodiment of the present invention.
  • Figure 10 is a schematic block diagram of an apparatus in accordance with yet another embodiment of the present invention.
  • LTE Long Term Evolution
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • 5G D2D (Device to Device) system
  • M2M Machine to Machine
  • a user equipment may also be called a terminal equipment (Terminal Equipment), a mobile station (Mobile Station, abbreviated as "MS”), and a mobile terminal ( Mobile terminal, etc.
  • the user equipment can communicate with one or more core networks via a Radio Access Network (“RAN"), for example, the user equipment can be a mobile phone (or “cellular”) Telephone), a computer with a mobile terminal, etc., for example, a portable, pocket, handheld, computer built-in or in-vehicle mobile device, and a terminal device in a future 5G network or a future evolved public land mobile network (Public Land) Terminal devices in the Mobile Network, referred to as "PLMN".
  • RAN Radio Access Network
  • PLMN Public Land
  • the base station may be an evolved Node B (abbreviated as "eNB” or "e-NodeB”) in the radio access network of the LTE system, or a future communication system.
  • eNB evolved Node B
  • e-NodeB evolved Node B
  • the base station in the radio access network is not limited in this application.
  • FIG. 1 is a schematic diagram of an application scenario according to an embodiment of the present invention.
  • the base station communicates with a plurality of user equipments (UE1 to UE3) by wireless signals.
  • the wireless signals commonly used for communication are transmitted and received in a certain modulation manner, and can be classified into two types: single carrier modulation and multi-carrier modulation.
  • the base station may also have neighboring base stations and user equipments that transmit services on the same or different time-frequency resources, and each of the base stations may include other numbers of user equipments in the coverage.
  • the wireless communication system in which the base station and the user equipment are located in FIG. 1 may further include other network entities, such as a network controller, a mobility management entity, and the like, and the embodiment of the present invention is not limited thereto.
  • network entities such as a network controller, a mobility management entity, and the like, and the embodiment of the present invention is not limited thereto.
  • the base station may include an antenna or an antenna array, a duplexer, a transmitter (Transmitter, abbreviated as "TX”), and a receiver (Receiver, abbreviated as "RX”).
  • TX and RX may be collectively referred to as a transceiver. TRX), and baseband processing.
  • the duplexer is used to enable the antenna or the antenna array to be used for both transmitting signals and receiving signals.
  • TX is used to convert between RF signal and baseband signal.
  • TX can include Power Amplifier (“PA”), Digital to Analog Converter (“DAC”) and inverter.
  • PA Power Amplifier
  • DAC Digital to Analog Converter
  • the PA generally works in a certain linear range. When the input signal amplitude is too large, the PA will work in a non-linear interval and reduce the efficiency of the PA.
  • the RX may include a low-noise Amplifier (Low-Noise Amplifier, referred to as "LNA”), Analog to Digital Converter (“ADC”) and frequency converter.
  • LNA Low-Noise Amplifier
  • ADC Analog to Digital Converter
  • the baseband processing section is used to implement processing of transmitted or received signals, such as layer mapping, precoding, modulation/demodulation, encoding/compiling, etc., and for physical control channels, physical data channels, physical broadcast channels, reference signals, and the like. Separate processing.
  • the base station may further include a control portion for performing multi-user scheduling and resource allocation, pilot scheduling, user physical layer parameter configuration, and the like.
  • the UE may include an antenna, a duplexer, TX and RX (TX and RX may be collectively referred to as a transceiver TRX), and a baseband processing section. As shown in FIG. 2, the UE has a single antenna. It should be understood that the UE may also have multiple antennas (ie, antenna arrays). Among them, the duplexer enables the antenna or the antenna array to be used for both transmitting signals and receiving signals. TX is used to convert between RF signal and baseband signal. Generally, TX can include PA, DAC and inverter. The UE side is battery-powered, which is more sensitive to PA power amplifier efficiency. Usually RX can include LNA, ADC and Inverter.
  • the baseband processing section is used to implement processing of transmitted or received signals, such as layer mapping, precoding, modulation/demodulation, encoding/decoding, and the like. And separate processing is performed on the physical control channel, the physical data channel, the physical broadcast channel, the reference signal, and the like.
  • the UE may further include a control part, configured to request an uplink physical resource, and calculate channel state information (CSI) corresponding to the downlink channel, Determine whether the downlink packet is successfully received, etc.
  • CSI channel state information
  • embodiments of the present invention can be applied to a baseband processing portion of a base station or user equipment.
  • the Floor function is an operation function that is rounded down, and a mathematical symbol can be used. Said.
  • the Ceiling function is an up-rounding function, which can be used with mathematical symbols. Said. E.g,
  • FIG. 3 illustrates a method 300 for processing a communication signal in a communication system according to an embodiment of the present disclosure.
  • the method 300 for processing a communication signal may be applied to the application scenario shown in FIG. 1, but the embodiment of the present invention is not limited thereto.
  • the method 300 includes:
  • the input data is subjected to discrete Fourier transform processing and orthogonal frequency division multiplexing is performed in the same symbol as the pilot sequence.
  • the peak-to-average power ratio at the time of transmitting information in the communication system can be reduced, and the transmission overhead of the pilot can be reduced.
  • the input data may be encoded and modulated user data.
  • the transmitting end for example, the base station or the user equipment
  • FEC Forward Error Correction
  • N for example, M/2
  • DFT Discrete Fourier Transform
  • the user data may refer to a physical downlink control channel (Physical Downlink Control Channel, referred to as "PDCCH”), a physical downlink shared channel (Physical Downlink Shared Channel (PDSCH), and a physical hybrid.
  • the physical hybrid data channel Physical Hybrid ARQ Indicator Channel, referred to as "PHICH”
  • PHICH Physical Hybrid ARQ Indicator Channel
  • the user data may refer to a Physical Uplink Shared Channel (PUSCH), physical.
  • the uplink uplink control channel Physical Uplink Control Channel, abbreviated as "PUCCH”
  • PUCCH Physical Uplink Control Channel
  • step S320 may be: mapping the DFT data sequence and the pilot sequence to different ones of the M valid subcarriers in the same symbol.
  • mapping the DFT data sequence to M/ On the two subcarriers the pilot sequence is mapped to other M/2 subcarriers.
  • the effective subcarrier can be understood as the subcarrier included in the bandwidth that can be used for transmitting data in the total bandwidth supported by the communication system.
  • the total band supported by the communication system can be referred to as “system bandwidth”, and the system bandwidth can be understood as the existing communication standard.
  • the system bandwidth that the LTE system can support may be 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, and the like.
  • the pilot sequence may be a Zadoff-Chu (“ZC") sequence, and may be other suitable sequences, which is not limited in this application.
  • ZC Zadoff-Chu
  • the transmitting signal may be generated according to the frequency domain generating signal method, as shown in S430-S460 in FIG. 4, the transmitting end may be in the mapped sub-carrier.
  • the two ends of the carrier are zero-padded, and then an Inverse Fast Fourier Transform ("IFFT") or an Inverse Discrete Fourier Transform (“IDFT”) is added, followed by a cyclic prefix. Or the 0 prefix, after serial and parallel conversion, is sent to the RF transmitting module for transmission.
  • IFFT Inverse Fast Fourier Transform
  • IDFT Inverse Discrete Fourier Transform
  • the receiving end when receiving, receives according to the reverse process of the above method 300. Specifically, the receiving end receives the data processed by the receiver radio frequency from the radio frequency receiving module, performs serial-to-parallel conversion, and removes the cyclic prefix or the zero prefix, and then performs FFT, and removes zeros at both ends of the subcarrier; and then uses the pilot part.
  • the channel estimation is performed, the channels on all time-frequency resources are estimated, and the estimated channel information is used to perform demodulation of the data portion.
  • the pilot sequence when performing orthogonal frequency division multiplexing on the DFT data sequence and the pilot sequence in the same symbol, the pilot sequence may be mapped to the M in the time domain symbol according to a distributed mapping manner.
  • K is a positive integer less than or equal to MN
  • M is the number of effective subcarriers in the symbol
  • N is the number of points processed by the DFT; mapping the DFT data sequence into the symbol Among the M subcarriers, N subcarriers different from the K subcarriers.
  • the manner of the distributed mapping may be performed by mapping the subcarriers with fixed intervals to one subcarrier, or mapping the subcarriers with irregular intervals to one subcarrier, for example,
  • subcarrier mapping may be performed in such a manner that one subcarrier is first spaced, two subcarriers are further spaced apart, one subcarrier is further spaced, and two subcarriers are further spaced.
  • the manner in which each seed carrier is mapped may be referred to as a mapping pattern.
  • the pilot sequence may be mapped to the K subcarriers by using L subcarriers mapped to one subcarrier, where L is a positive integer greater than or equal to 1. For example, the value of L can be 1.
  • the system may pre-define the pilot sequence to start mapping from the first subcarrier or start mapping from the second subcarrier or start mapping from other numbered subcarriers;
  • the dynamic selection of two "combs” can be performed in a certain way, for example, a "comb” rotation between two adjacent symbols or time slots (a time slot composed of a plurality of consecutive symbols), but This application is not limited to this.
  • the DFT data sequence may be phase rotated and mapped to the N subcarriers.
  • the DFT data sequence is subjected to sample point shift processing, for example, S470 in Fig. 4, and the DFT data sequence is subjected to half sampling point shift processing.
  • the phase rotation factor of the phase rotation is S is the number of the subcarrier
  • T is the number of fast Fourier transform IFFT points in the communication system.
  • the number of IFFT points is generally the smallest, greater than M, 3, or 5 product or integer power.
  • the above is a frequency domain signal generation method. It should be understood that the transmission signal generated by the above-described frequency domain signal generation method is equivalent to the transmission signal generated by the following time domain signal generation method:
  • l denotes the lth symbol
  • 0 ⁇ t ⁇ (N CP,l +T) ⁇ T s is the symbol duration
  • s l (t) is the generated time domain signal
  • N CP,l denotes the CP in symbol l
  • T is the number of inverse Fourier transform points in the communication system
  • ⁇ f represents the subcarrier frequency domain interval
  • T s is the system sampling clock period.
  • the information modulated on the symbol l and the subcarrier k (-) may be a DFT-transformed data symbol or a symbol of the pilot
  • g(x) is a logic function, and the value is 0 or 1.
  • the device at the receiving end needs to determine whether the DFT data sequence is subjected to phase rotation processing. For example, whether the phase rotation processing can be performed according to a predefined implicit indication rule of the system, preferably, the transmitting end can send the sampling to the receiving end.
  • the point shift indication information indicating that the DFT data sequence is subjected to phase rotation processing.
  • the receiving end converts the received signal into a frequency domain signal when performing data demodulation (specifically, the received symbol (including the synthesized symbol composed of the pilot and the data) may be subjected to FFT or IDFT to obtain a frequency domain signal) And performing frequency domain equalization processing on the DFT data sequence according to the channel estimation information, and performing N-point discrete Fourier transform (IDFT) on the phase-compensated data of the frequency-domain equalized data sequence to obtain IDFT data.
  • IDFT discrete Fourier transform
  • the sampling point shift indication information is sent to the receiving end by sending a physical control channel (for example, PDCCH) to the receiving end, where the sending end is the user equipment.
  • a physical control channel for example, PDCCH
  • the base station may indicate whether the user equipment performs the sampling point shift when performing pilot and data transmission in a single symbol by sending a physical control channel to the user equipment, but the present application Not limited to this.
  • the PDCCH information further includes at least one of the following: modulation and coding policy level information, user equipment group information, location information of the data in the DFT, pilot and data occupied subcarriers. information.
  • the value of N may be M/2, and the number of pilot sequences may be M/2.
  • a method 500 for processing a communication signal in a communication system will be described in detail below with reference to FIG. 5.
  • the method 500 can be performed by a base station. As shown in FIG. 5, the method 500 includes:
  • S510 Perform N-point discrete Fourier transform DFT processing on the first data to obtain a first DFT data sequence, where the first data corresponds to the first group of user equipments, where N is less than M, and M is a system of the communication system.
  • the number of effective subcarriers included in the bandwidth, and M is a positive integer greater than one;
  • data of two sets of user equipments is subjected to independent discrete Fourier transform processing and subcarrier mapping to ensure that two sets of user equipments are independently transmitted, thereby
  • the group user equipment can independently perform multi-input and multi-output processing to obtain diversity, multiplexing, and array gain, and can reduce the peak-average function when transmitting information in the communication system. Rate ratio.
  • the user equipments in the system can be divided into two groups, and the first group includes n user equipments (n is greater than The second group includes the user equipment of m (m is an integer greater than 0).
  • the data of each user equipment in each group of user equipments is independently FEC encoded and interleaved. , scrambling, modulation, and the data modulated in the two groups are subjected to DFT processing.
  • the data of the first group of user equipments is subjected to N-point DFT processing to obtain a first DFT data sequence; and the data of the second group of user equipments is subjected to K-point DFT processing to obtain a second DFT data sequence, optionally, N and The value of K can be both M/2.
  • first and second are only used to distinguish and not describe the features described, for example, “first group of user equipments” may also be referred to as “second group of user equipments”, “first DFT data”.
  • the sequence can also be a "second DFT data sequence”.
  • the first DFT data sequence and the second DFT data sequence cannot occupy all valid subcarriers.
  • the first DFT data sequence may be repeatedly mapped and/or The manner of the second DFT data sequence avoids waste of frequency domain resources.
  • S530 may be expressed as: mapping the first DFT data sequence and the second DFT data sequence to different subcarriers of the M subcarriers in the same symbol, as shown in S620 in FIG.
  • the two sets of DFT data sequences are separately subjected to subcarrier mapping.
  • the base station may add zeros at both ends of the mapped subcarriers, and then perform IFFT or IDFT; and then add a cyclic prefix or a 0 prefix, and after serial-to-parallel conversion, send the radio frequency transmitting module. Send it.
  • the user equipment when receiving, performs the reverse process according to the foregoing method 500. Specifically, the user equipment receives the data processed by the receiver from the radio frequency receiving module, performs serial-to-parallel conversion, and removes the cyclic prefix or the 0 prefix, and then performs FFT, and removes zeros at both ends of the subcarrier, and then uses the guide.
  • the pilot in the symbol of the frequency part performs channel estimation, estimates the channel on all time-frequency resources in the symbol, and uses the estimated channel information to perform data demodulation.
  • the first DFT data sequence is distributed and mapped. Mapping to N subcarriers of the M subcarriers within the symbol, mapping the second DFT data sequence to other than the N subcarriers of the M subcarriers within the symbol On K subcarriers in subcarriers.
  • the manner of the distributed mapping may be performed by mapping the subcarriers with fixed intervals to one subcarrier, or mapping the subcarriers with unfixed intervals to one subcarrier, for example, A DFT data sequence is mapped in such a manner that one subcarrier is first spaced, two subcarriers are spaced apart, one subcarrier is further spaced, and two subcarriers are further spaced.
  • the manner in which each seed carrier is mapped may be referred to as a mapping pattern.
  • the first DFT data may be mapped to the N subcarriers by using L subcarriers mapped to one subcarrier, where L is a positive integer greater than or equal to 1. For example, the value of L is 1.
  • the second DFT data sequence when the second DFT data sequence is mapped to K subcarriers of the M subcarriers other than the N subcarriers in the M subcarriers in the symbol, the second DFT data sequence may be phase rotated Then mapping to K subcarriers of the M subcarriers other than the N subcarriers in the symbol, or performing the sampling point shift processing on the second DFT data sequence, for example, in FIG. S670, half sampling point shift processing can be performed, wherein the phase rotation factor of the bit rotation is S is the number of the subcarrier, and T is the inverse Fourier transform IFFT point number in the communication system.
  • the number of IFFT points is generally the smallest, greater than M, 2, 3 or 5 integer powers.
  • the above is a frequency domain signal generation method.
  • the time domain signal generation method described in the method 300 above may be used to generate a transmission signal equivalent to the transmission signal generated by the above-described frequency domain signal generation method. To avoid repetition, details are not described again. Thereby, the peak-to-average power ratio in the communication system can be further reduced.
  • the user equipment needs to determine whether the second DFT data sequence is subjected to phase rotation processing, for example, the second DFT may be determined according to a system predefined implicit indication rule. Whether the data sequence is subjected to phase rotation processing.
  • the base station may send sampling point shift indication information to the user equipment, where the sampling point shift indication information indicates that the second DFT data sequence is subjected to phase rotation processing.
  • the received signal needs to be converted into a frequency domain signal; then, according to the channel estimation information, the second DFT data sequence is subjected to frequency domain equalization processing to obtain a frequency domain equalized data sequence, which will be
  • the phase-compensated data sequence of the frequency-domain equalized data sequence performs a K-point IDFT to obtain an IDFT data sequence, wherein the phase compensation factor of the phase compensation is
  • the user equipment intercepts the information symbols of the user equipment and performs demodulation and decoding processing.
  • data of multiple user equipments may be multiplexed according to method 500 to form a set of numbers.
  • the data set can be multiplexed in the same symbol by the method 300 and the pilot sequence.
  • the base station may send physical downlink control channel PDCCH information to the user equipment, where the PDCCH information includes the sampling point shift indication information.
  • the PDCCH information further includes at least one of the following: modulation and coding policy level information, user equipment group information, and location information of the data in the DFT.
  • the modulation and coding scheme (“MCS”) information may be used to multiplex the indication method of the MCS in the LTE system, and the 32 MCS levels are represented by 5 bits.
  • the user equipment grouping information is used to indicate the group to which the user equipment belongs, and the group to which the user equipment belongs may be indicated by one bit. For example, “1” may be used to indicate that the user equipment belongs to the first group of user equipments, and “0” indicates that the user equipment belongs to the second group of user equipments. It is also possible to use multiple bits to indicate the packet to which the user equipment belongs.
  • the location information of the data in the DFT is used to indicate which part of the first DFT data sequence the data corresponding to the user equipment is, or which part of the second DFT data sequence, in particular, a DFT data block may include
  • the data of the user equipments 1, 2, and 3 can be cascaded into P symbols to perform DFT processing.
  • the user equipment receives data, it needs to know the symbols occupied by the corresponding data. Which of the P symbols are the locations of the user equipment's data in the DFT.
  • the number of bits required to carry the location information of the data in the DFT may be calculated according to formula (1):
  • M step is the minimum granularity indicated by the resource, which is an integer greater than or equal to 1.
  • the base station can be configured by broadcast or predefined by the system.
  • the L CRs jointly represent the location of the data of the user equipment, and the Resource Indicator Value ("RIV") of the PDCCH can be calculated by the following method:
  • the value of N may be M/2, and further, the value of K may be M/2.
  • the method 500 is not necessarily limited to the case of two sets of user equipment, but may also be applied to the case of more than two sets of user equipment. At this point, it is only necessary to perform the corresponding operation according to the method 500.
  • a method of processing a communication signal in a communication system according to an embodiment of the present invention is described in detail above with reference to FIGS. 3 through 6, and an apparatus according to an embodiment of the present invention will be described in detail below with reference to FIGS. 7 through 10.
  • Figure 7 shows a device 10 according to an embodiment of the invention, the device 10 comprising:
  • a first processing unit 11 configured to perform discrete Fourier transform DFT processing on the input data to obtain a DFT data sequence
  • the second processing unit 12 is further configured to perform orthogonal frequency division multiplexing on the DFT data sequence and the pilot sequence in the same symbol.
  • the input data is subjected to discrete Fourier transform processing, and orthogonal frequency division multiplexing is performed in the same symbol as the pilot sequence.
  • orthogonal frequency division multiplexing is performed in the same symbol as the pilot sequence.
  • the first processing unit 11 is configured to: map the pilot sequence according to a distributed mapping manner by performing orthogonal frequency division multiplexing on the DFT data sequence and the pilot sequence in the same symbol.
  • K is a positive integer less than or equal to MN
  • M is the number of effective subcarriers in the symbol
  • N is the number of points processed by the DFT
  • the DFT data is The sequence is mapped to N subcarriers of the M subcarriers within the symbol that are different from the K subcarriers.
  • the first processing unit 11 is configured to: phase the DFT data sequence into the N subcarriers of the M subcarriers in the symbol that are different from the K subcarriers.
  • the first processing unit 11 is configured to: map the pilot sequence according to a distributed mapping manner to K subcarriers of the M subcarriers in the symbol.
  • a manner in which L subcarriers are mapped onto one subcarrier is mapped to the K subcarriers, and L is a positive integer greater than or equal to 1.
  • N is M/2.
  • the apparatus 10 herein is embodied in the form of a functional unit.
  • the term "unit” herein may refer to an application specific integrated circuit ("ASIC"), an electronic circuit, a processor for executing one or more software or firmware programs (eg, a shared processor, a proprietary A processor or group processor, etc.) and memory, merge logic, and/or other suitable components that support the functions described.
  • ASIC application specific integrated circuit
  • the apparatus 10 may be used to perform various processes and/or steps of the method 300 in the foregoing method embodiments. To avoid repetition, details are not described herein.
  • Figure 8 shows a device 20 according to another embodiment of the invention, the device 20 comprising:
  • the first processing unit 21 is configured to perform N-point discrete Fourier transform DFT processing on the first data to obtain a first DFT data sequence, where the first data corresponds to the first group of user equipments, where N is less than M, M M is a positive integer greater than 1 for the number of valid subcarriers included in the system bandwidth of the communication system;
  • the first processing unit 21 is further configured to perform K-point DFT processing on the second data to obtain a second DFT data sequence, where the second data corresponds to the second group of user equipments, and K is less than or equal to M-N;
  • the second processing unit 22 is further configured to perform orthogonal frequency division multiplexing on the first DFT data sequence and the second DFT data sequence in the same symbol.
  • the data of the two sets of user equipments are subjected to independent discrete Fourier transform processing and subcarrier mapping to ensure that the two sets of user equipments are independently transmitted, thereby each group of user equipments can independently perform multiple inputs.
  • Multiple output processing which acquires diversity, multiplexing, and array gain, and reduces the peak-to-average power ratio when transmitting information in a communication system.
  • the second processing unit 22 is specifically configured to: use the first DFT data sequence Mapping to N subcarriers of M subcarriers within the symbol according to a distributed mapping manner; mapping the second DFT data sequence to other subcarriers of the M subcarriers in the symbol except the N subcarriers On the K subcarriers.
  • the second processing unit 22 is specifically configured to map the second DFT data sequence to K subcarriers of the M subcarriers other than the N subcarriers in the M subcarriers in the symbol. Transmitting the second DFT data sequence to K subcarriers of the M subcarriers other than the N subcarriers in the M subcarriers in the symbol;
  • phase rotation factor of the phase rotation is S is the number of the subcarrier, and T is the number of fast Fourier transform IFFT points in the communication system.
  • the first processing unit 22 is specifically configured to: map the first DFT data sequence to the N subcarriers of the M subcarriers in the symbol according to a distributed mapping manner, where the second processing unit 22 is specifically configured to: use the first DFT The data sequence is mapped to the N subcarriers in such a manner that every L subcarriers are mapped to one subcarrier, and L is a positive integer greater than or equal to 1.
  • N is M/2.
  • the apparatus 20 herein is embodied in the form of a functional unit.
  • the term "unit” herein may refer to an application specific integrated circuit ("ASIC"), an electronic circuit, a processor for executing one or more software or firmware programs (eg, a shared processor, a proprietary A processor or group processor, etc.) and memory, merge logic, and/or other suitable components that support the functions described.
  • ASIC application specific integrated circuit
  • the apparatus 20 may be used to perform various processes and/or steps of the method 500 in the foregoing method embodiments. To avoid repetition, details are not described herein again.
  • FIG. 9 shows a device 30 according to a further embodiment of the invention, the device 30 comprising a processor 31, a memory 32 and a bus system 33, the processor 31 and the memory 32 being connected by a bus system 33, the memory 32 being used for
  • the instructions are stored by the processor 31 for executing the instructions stored by the memory 32 such that the apparatus 30 performs the steps performed by the base station or user equipment in the method 300 above.
  • the processor 31 is configured to input data and perform discrete Fourier transform DFT processing to obtain a DFT data sequence.
  • the processor 31 is further configured to perform orthogonal frequency division multiplexing on the DFT data sequence and the pilot sequence in the same symbol.
  • the input data is subjected to discrete Fourier transform processing, and then the pilot sequence is mapped in the same symbol to perform orthogonal frequency division multiplexing.
  • the peak-to-average power ratio at the time of information transmission in the communication system can be reduced, and the pilot transmission overhead can be reduced.
  • the processor 31 may be a central processing unit (CPU), and the processor 31 may also be other common parts.
  • Processor Digital Signal Processing (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic device , discrete gates or transistor logic devices, discrete hardware components, etc.
  • DSP Digital Signal Processing
  • ASIC Application Specific Integrated Circuit
  • FPGA Field-Programmable Gate Array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 31 may also be a dedicated processor, and the dedicated processor may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the base station.
  • the memory 32 can include read only memory and random access memory and provides instructions and data to the processor 31. A portion of the memory 32 may also include a non-volatile random access memory. For example, the memory 32 can also store information of the device type.
  • the bus system 33 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as the bus system 33 in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor 31 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 32, and the processor 31 reads the information in the memory 32 and, in conjunction with its hardware, performs the steps of the above method. To avoid repetition, it will not be described in detail here.
  • the processor 31 is specifically configured to map the pilot sequence to K subcarriers of the M subcarriers in the symbol according to a distributed mapping manner, where K is less than or equal to MN.
  • K is less than or equal to MN.
  • M is the number of valid subcarriers in the symbol
  • N is the number of points processed by the DFT; and the DFT data sequence is mapped to N subcarriers of the M subcarriers in the symbol different from the K subcarriers on.
  • the processor 31 is specifically configured to: after the phase rotation of the DFT data sequence is mapped to the N subcarriers, where the phase rotation factor of the phase rotation is S is the number of the subcarrier, and T is the number of fast Fourier transform IFFT points in the communication system.
  • the processor 31 is specifically configured to: follow the pilot sequence according to The mapping is performed on the K subcarriers every L subcarriers are mapped to one subcarrier, and L is a positive integer greater than or equal to 1.
  • the value of N is M/2.
  • apparatus 30 in accordance with an embodiment of the present invention may correspond to apparatus 10 in accordance with an embodiment of the present invention, and that the above and other operations and/or functions of various modules in apparatus 30 are respectively implemented to implement the respective processes of method 300 of FIG. For the sake of brevity, we will not repeat them here.
  • the input data is subjected to discrete Fourier transform processing, and orthogonal frequency division multiplexing is performed in the same symbol as the pilot sequence.
  • orthogonal frequency division multiplexing is performed in the same symbol as the pilot sequence.
  • FIG. 10 shows a device 40 according to a further embodiment of the present application.
  • the device 40 comprises a processor 41, a memory 42 and a bus system 43.
  • the processor 41 and the memory 42 are connected by a bus system 43 for
  • the processor 41 is configured to execute the instructions stored by the memory 42 such that the apparatus 40 performs the steps performed by the base station in the method 500 above.
  • the processor 41 is configured to perform N-point discrete Fourier transform DFT processing on the first data to obtain a first DFT data sequence, where the first data corresponds to the first group of user equipments, where N is less than M, and M is the communication.
  • the system bandwidth of the system includes the number of effective subcarriers, and M is a positive integer greater than one;
  • the processor 41 is further configured to perform K-point DFT processing on the second data to obtain a second DFT data sequence, where the second data corresponds to the second group of user equipments, and K is less than or equal to M-N;
  • the processor 41 is further configured to perform orthogonal frequency division multiplexing on the first DFT data sequence and the second DFT data sequence in the same symbol.
  • the device of the embodiment of the present invention performs independent discrete Fourier transform processing and subcarrier mapping on data of two sets of user equipments, so as to ensure that two sets of user equipments are independently transmitted, thereby, each group of user equipments can independently perform multiple input and multiple inputs.
  • the processor 41 may be a central processing unit (CPU), and the processor 41 may also be other general-purpose processors and digital signal processors (Digital). Signal Processing (DSP), Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete Hardware components, etc.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 41 may also be a dedicated processor, and the dedicated processor may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the base station.
  • the memory 42 can include read only memory and random access memory and provides instructions and data to the processor 41.
  • a portion of the memory 42 may also include a non-volatile random access memory.
  • the memory 42 can also store information of the device type.
  • the bus system 43 may include a power bus, a control bus, a status signal bus, and the like in addition to the data bus. However, for clarity of description, various buses are labeled as the bus system 43 in the figure.
  • each step of the above method may be completed by an integrated logic circuit of hardware in the processor 41 or an instruction in a form of software.
  • the steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor.
  • the software modules can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, and the like.
  • the storage medium is located in the memory 42, and the processor 41 reads the information in the memory 42 and performs the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the processor 41 is specifically configured to: map the first DFT data sequence to N subcarriers of the M subcarriers in the symbol according to a distributed mapping manner; The DFT data sequence is mapped to K subcarriers of the M subcarriers in the symbol except for the N subcarriers.
  • the processor 41 is specifically configured to: after the phase rotation of the second DFT data sequence is mapped to other subcarriers of the M subcarriers in the symbol except the N subcarriers. On K subcarriers;
  • phase rotation factor of the phase rotation is S is the number of the subcarrier, and T is the number of fast Fourier transform IFFT points in the communication system.
  • the processor 41 is specifically configured to map the first DFT data sequence to the N subcarriers according to the manner that every L subcarriers are mapped to one subcarrier, where L is greater than Or a positive integer equal to 1.
  • the value of N is M/2.
  • the device of the embodiment of the present invention performs independent discrete Fourier processing and subcarrier mapping on data of two sets of user equipments, so as to ensure that two sets of user equipments are independently transmitted, thereby, each group of user equipments can be
  • the multi-input and multi-output processing is performed independently to obtain diversity, multiplexing, and array gain, and the peak-to-average power ratio of the communication system can be reduced.
  • the term "and/or” is merely an association relationship describing an associated object, indicating that there may be three relationships.
  • a and/or B may indicate that A exists separately, and A and B exist simultaneously, and B cases exist alone.
  • the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of cells is only a logical function division.
  • multiple units or components may be combined or integrated. Go to another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, or an electrical, mechanical or other form of connection.
  • the units described as separate components may or may not be physically separate, and the components displayed as units 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 units may be selected according to actual needs to achieve the objectives of the embodiments of the present invention.
  • each functional unit in various embodiments of the present invention may be integrated in one processing unit
  • each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.
  • Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another.
  • a storage medium may be any available media that can be accessed by a computer.
  • computer readable media may comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, disk storage media or other magnetic storage device, or can be used for carrying or storing in the form of an instruction or data structure.
  • Any connection may suitably be a computer readable medium.
  • the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), or wireless technologies such as infrared, radio, and microwave.
  • coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, wireless, and microwave are included in the fixing of the associated medium.
  • a disk and a disc include a compact disc (CD), a laser disc, a compact disc, a digital versatile disc (DVD), a floppy disk, and a Blu-ray disc, wherein the disc is usually magnetically copied, and the disc is The laser is used to optically replicate the data. Combinations of the above should also be included within the scope of the computer readable media.

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Abstract

La présente invention concerne, dans un mode de réalisation, un procédé et un dispositif de traitement de signaux dans un système de communication. Le procédé consiste à : mettre en oeuvre un traitement de transformée de Fourier discrète (TFD) sur des données d'entrée et acquérir une séquence de données de TFD ; et mettre en oeuvre un multiplexage par répartition orthogonale de la fréquence sur la séquence de données de TFD et une séquence de fréquence pilote dans un même symbole. L'invention permet de réduire le rapport puissance de crête/puissance moyenne lorsque des informations sont transmises dans le système de communication, ce qui réduit le surdébit de transmission d'une fréquence pilote.
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