WO2021082699A1 - 一种通信方法及装置 - Google Patents

一种通信方法及装置 Download PDF

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Publication number
WO2021082699A1
WO2021082699A1 PCT/CN2020/111927 CN2020111927W WO2021082699A1 WO 2021082699 A1 WO2021082699 A1 WO 2021082699A1 CN 2020111927 W CN2020111927 W CN 2020111927W WO 2021082699 A1 WO2021082699 A1 WO 2021082699A1
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WIPO (PCT)
Prior art keywords
ofdm symbol
symbol sequence
frequency band
signal frame
sequence
Prior art date
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PCT/CN2020/111927
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English (en)
French (fr)
Inventor
谢志鹏
曾焱
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华为技术有限公司
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Publication of WO2021082699A1 publication Critical patent/WO2021082699A1/zh

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    • 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
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/54—Systems for transmission via power distribution lines
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • 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
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • the first frequency band is a passband (passband) frequency band
  • the second frequency band is a baseband (baseband) frequency band.
  • the baseband may be a subcarrier transmission signal of 2 to 80 megahertz (MHz)
  • the passband may be a subcarrier transmission signal of 110 to 400 MHz.
  • the power line communication system can transmit only through the first frequency band or transmit signal frames only through the second frequency band.
  • the power line communication system can also transmit signal frames through the first frequency band and the second frequency band respectively in the shared transmission time slot. This transmission method can be called dual-band concurrent communication.
  • the first frequency band signal frame and the second frequency band signal frame are transmitted and received independently, so the OFDM symbol sequence corresponding to the first frequency band signal frame and the second frequency band signal
  • the OFDM symbol sequence corresponding to the frame needs to carry a preamble for signal frame synchronization, where each preamble occupies one or more orthogonal frequency division multiplexing (OFDM) symbols.
  • OFDM orthogonal frequency division multiplexing
  • the preamble symbol corresponding to the second frequency band signal frame occupies too much transmission resources of the second frequency band, and the overhead is relatively large.
  • the present application provides a communication method and device, which are used to reduce the problem that the second frequency band with a lower sampling rate has a higher overhead when dual-band concurrency is adopted in a power line communication system.
  • the present application provides a communication method, which can be implemented by a transmitting end communication device (hereinafter referred to as a transmitting end) or a chip in the transmitting end, and the transmitting end can be used for sending signal frames.
  • a transmitting end communication device hereinafter referred to as a transmitting end
  • the communication device may be a power line communication modem such as a power modem, or other wired or wireless communication devices.
  • the transmitting end can modulate the first signal frame into a first OFDM symbol sequence, and modulate the part of the second signal frame except the preamble sequence into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include multiple OFDM symbols (hereinafter may be simply referred to as symbols)
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the sending end may send the first OFDM symbol sequence first, and send the second OFDM symbol at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence
  • n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the cutoff point of the nth OFDM symbol of the transmitting end of the first OFDM symbol sequence is aligned with the starting point of the first OFDM symbol of the transmitting end of the second OFDM symbol sequence.
  • the second signal frame may include a pilot signal.
  • the pilot signal can be used to perform channel estimation on the header symbol of the second signal frame to extract the management information carried in the header of the second signal frame, thereby reducing the management information caused by the second OFDM symbol sequence not containing the preamble symbol Difficulty of extraction.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine the cutoff point of the sending end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the receiving end can learn that the transmitting end has sent the nth OFDM symbol in the first OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the second OFDM symbol sequence according to the indication information in the first signal frame.
  • One OFDM symbol so that the receiving end receives the first OFDM symbol in the second OFDM symbol sequence from the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the transmitting end can control whether the receiving end receives the OFDM symbol sequence carried in the second frequency band according to the communication method provided in the present application, thereby improving communication reliability and flexibility.
  • the transmitting end may determine the nth OFDM symbol from the N OFDM symbols, and the N OFDM symbols are For the OFDM symbols included in the first OFDM symbol sequence, the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain, N is a positive integer, and n is less than N.
  • the sending end may generate the above-mentioned indication information to indicate the value of n to the receiving end through the indication information, so that the receiving end can determine the cut-off point of receiving the nth OFDM symbol of the first OFDM symbol sequence and receive the second OFDM symbol The first OFDM symbol of the sequence.
  • time-domain overlap of the second OFDM symbol sequence and the third OFDM symbol sequence can be avoided, signal interference is reduced, and transmission quality is improved.
  • the sending end may send the first OFDM symbol sequence, and then At the cutoff point of the preamble symbol of the first OFDM symbol sequence, the first OFDM symbol in the second OFDM symbol sequence is sent.
  • the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the preamble symbol of the first OFDM symbol sequence, which can maximize the use of the time domain transmission resources of the second frequency band and improve the transmission resource efficiency. Utilization rate.
  • the present application provides a communication method, which can be implemented by a receiving end communication device (hereinafter referred to as a receiving end) or a chip in the sending end, and the receiving end can be used to receive signal frames, where the signal frame Can be sent by the sender.
  • the communication device may be a power line communication modem such as a power modem, or other wired or wireless communication devices.
  • the receiving end can receive the first OFDM symbol sequence transmitted through the first frequency band (such as the passband in power line communication), and synchronize the first signal frame according to the preamble symbol.
  • the preamble symbol is included in the first OFDM symbol sequence.
  • the first OFDM symbol sequence is carried in the first frequency band, the first OFDM symbol sequence includes a plurality of OFDM symbols, and the first OFDM symbol sequence is modulated according to a first signal frame, and the first signal frame includes a preamble. Sequence, the first signal frame is converted from a signal obtained through a first sampling rate on the first frequency band.
  • the receiving end may receive the first OFDM symbol in the second OFDM symbol sequence through the second frequency band (such as the baseband in power line communication) at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence, n Is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the second signal frame may include a pilot signal.
  • the pilot signal can be used to perform channel estimation on the header symbol of the second signal frame to extract the management information carried by the header of the second signal frame.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine the cutoff point of the sending end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the receiving end when the receiving end determines that the third OFDM symbol sequence carried in the second frequency band is detected, the receiving end may determine the nth OFDM symbol according to the indication information, so that in the receiving first OFDM symbol sequence The cut-off point of the nth OFDM symbol, receiving the first OFDM symbol of the second OFDM symbol sequence.
  • the receiving end may The cut-off point of the preamble symbol in the first OFDM symbol sequence is received, and the first OFDM symbol in the second OFDM symbol sequence is received.
  • the present application provides a communication device, which may be a sending-end communication device or a chip in a sending-end communication device.
  • the communication device may be used to perform the functions or steps or operations provided in the first aspect or any possible design of the first aspect.
  • the communication device can implement each function or step or operation in each of the foregoing methods through a hardware structure, a software module, or a hardware structure plus a software module.
  • a communication device may be provided with functional modules corresponding to the functions or steps or operations in the foregoing methods to support the communication device to execute the foregoing methods.
  • the communication device may include a communication module and a processing module coupled with each other, wherein the communication module can be used to support the communication device to communicate, and the processing module can be used for the communication device to perform processing operations, Such as generating information/messages that need to be sent through the communication module, or processing signals received by the communication module to obtain information/messages.
  • the processing module may be used to modulate the first signal frame into a first OFDM symbol sequence, and modulate a part of the second signal frame except the preamble sequence into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the communication module may be used to send the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the first OFDM symbol in the second OFDM symbol sequence, where n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame includes indication information.
  • the indication information can be used to determine the cut-off point of the transmitting end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the processing module when the processing module can also determine that the third OFDM symbol sequence of the second frequency band is detected, the processing module can also be used to determine the nth OFDM symbol from the N OFDM symbols, and the N OFDM symbols
  • the OFDM symbol is an OFDM symbol included in the first OFDM symbol sequence, the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain, N is a positive integer, and n is less than N.
  • the processing module can generate the above-mentioned indication information, which can be used to determine the value of n.
  • the communication module may be specifically configured to transmit the first OFDM symbol. At the cutoff point of the preamble symbol of the sequence, the first OFDM symbol in the second OFDM symbol sequence is sent.
  • the communication device may include a processor for executing the functions or steps or operations provided in the above-mentioned first aspect and/or any possible design of the first aspect.
  • the communication device may also include a memory. Wherein, the memory may be used to store instructions, and the processor may be used to call and run the instructions from the memory to execute the functions or steps or operations provided in the first aspect and/or any possible design of the first aspect.
  • the communication device may also include a communication interface for the communication device to communicate through a wired method such as a power line.
  • the processor may be used to modulate the first signal frame into a first OFDM symbol sequence, and modulate a part of the second signal frame except the preamble sequence into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the communication interface may be used to send the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the first OFDM symbol in the second OFDM symbol sequence, where n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame includes indication information.
  • the indication information can be used to determine the cut-off point of the transmitting end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the processor when the processor can also determine that the third OFDM symbol sequence of the second frequency band is detected, the processor can also be used to determine the nth OFDM symbol from the N OFDM symbols, and the N The OFDM symbol is an OFDM symbol included in the first OFDM symbol sequence, the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain, N is a positive integer, and n is less than N.
  • the processor may generate the foregoing indication information, and the indication information may be used to determine the value of n.
  • the communication interface may be specifically used to transmit the first OFDM symbol.
  • the first OFDM symbol in the second OFDM symbol sequence is sent.
  • the present application provides a communication device, which may be a receiving-end communication device or a chip in a receiving-end communication device.
  • the communication device can be used to perform the functions or steps or operations provided in the above-mentioned second aspect or any possible design of the second aspect.
  • the communication device can implement each function or step or operation in each of the foregoing methods through a hardware structure, a software module, or a hardware structure plus a software module.
  • a communication device may be provided with functional modules corresponding to the functions or steps or operations in the foregoing methods to support the communication device to execute the foregoing methods.
  • the communication device may include a communication module and a processing module coupled with each other, wherein the communication module can be used to support the communication device to communicate, and the processing module can be used for the communication device to perform processing operations, Such as generating information/messages that need to be sent through the communication module, or processing signals received by the communication module to obtain information/messages.
  • the communication module may be used to receive a first OFDM symbol sequence transmitted through a first frequency band (such as a passband in power line communication).
  • the processing module may synchronize the first signal frame according to the preamble symbol, and the preamble symbol is included in the first OFDM symbol sequence.
  • the first OFDM symbol sequence is carried in the first frequency band
  • the first OFDM symbol sequence includes a plurality of OFDM symbols
  • the first OFDM symbol sequence is modulated according to a first signal frame
  • the first signal frame includes a preamble.
  • the first signal frame is converted from a signal obtained through a first sampling rate on the first frequency band.
  • the communication module can also be used to receive the first OFDM symbol in the second OFDM symbol sequence through the second frequency band (such as the baseband in power line communication) at the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • Symbol, n is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine that the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence. And/or, the indication information can be used to determine the value of n.
  • the indication information is used to determine the value of n.
  • the processing module may determine the nth value according to the indication information. OFDM symbols, so that the communication module can receive the first OFDM symbol of the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the processing module determines that before receiving the first OFDM symbol sequence, the OFDM symbol sequence carried in the first frequency band and the OFDM symbol sequence carried in the second frequency band are not detected, then the communication The module may receive the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the preamble symbol of the first OFDM symbol sequence.
  • the communication device may include a processor for executing the functions or steps or operations provided in the foregoing second aspect and/or any possible design of the second aspect.
  • the communication device may also include a memory. Wherein, the memory may be used to store instructions, and the processor may be used to call and run the instructions from the memory to execute the functions or steps or operations provided in the second aspect and/or any possible design of the second aspect.
  • the communication device may also include a communication interface for the communication device to communicate through a wired method such as a power line.
  • the communication interface may be used to receive a first OFDM symbol sequence transmitted through a first frequency band (such as a passband in power line communication).
  • the processor may synchronize the first signal frame according to the preamble symbol, and the preamble symbol is included in the first OFDM symbol sequence.
  • the first OFDM symbol sequence is carried in the first frequency band
  • the first OFDM symbol sequence includes a plurality of OFDM symbols
  • the first OFDM symbol sequence is modulated according to a first signal frame
  • the first signal frame includes a preamble.
  • the first signal frame is converted from a signal obtained through a first sampling rate on the first frequency band.
  • the communication interface can also be used to receive the first OFDM symbol in the second OFDM symbol sequence through the second frequency band (such as the baseband in power line communication) at the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • Symbol, n is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine that the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence. And/or, the indication information can be used to determine the value of n.
  • the indication information is used to determine the value of n.
  • the processor may determine the nth value according to the indication information. OFDM symbols, so that the communication interface can receive the first OFDM symbol of the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the communication The interface may receive the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the preamble symbol of the first OFDM symbol sequence.
  • the present application provides a communication system, which may include the communication device shown in the third aspect and the communication device shown in the fourth aspect.
  • the communication device shown in the third aspect may be composed of software modules and/or hardware components
  • the communication device shown in the fourth aspect may be composed of software modules and/or hardware components.
  • the present application provides a communication system in which the transmitting end may modulate the first signal frame to The first OFDM symbol sequence, and the part except the preamble sequence in the second signal frame is modulated into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the sending end may send the first OFDM symbol sequence first, and send the second OFDM symbol at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence
  • n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the receiving end may receive the first OFDM symbol sequence transmitted through the first frequency band, and synchronize the first signal frame according to the preamble symbol in the first OFDM symbol sequence.
  • the receiving end may receive the first OFDM symbol in the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence, where n is a positive integer.
  • this application provides a computer-readable storage medium in which instructions (or programs) are stored, which when invoked for execution on a computer, cause the computer to execute the above-mentioned first aspect or Any one of the possible designs of the first aspect, or the method described in the above-mentioned second aspect or any one of the possible designs of the second aspect.
  • the computer when executing the above-mentioned first aspect or any one of the possible designs of the first aspect, when it is invoked and executed on a computer, the computer can modulate the first signal frame into the first OFDM symbol sequence, and the second signal frame The part except the preamble sequence is modulated into the second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • a first frequency band such as the passband in power line communication
  • the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the computer may send the first OFDM symbol sequence in the first frequency band through the communication interface, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the second OFDM symbol sequence in the second frequency band
  • n is a positive integer.
  • the computer can control the communication interface to receive the first frequency band (such as the passband in power line communication) transmission.
  • the first frequency band such as the passband in power line communication
  • An OFDM symbol sequence and perform synchronization of the first signal frame according to the preamble symbol in the first OFDM symbol sequence, and control the communication interface to pass the first signal frame at the cut-off point of receiving the nth OFDM symbol of the first OFDM symbol sequence
  • the second frequency band (such as the baseband in power line communication) receives the first OFDM symbol in the second OFDM symbol sequence, and n is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the present application provides a computer program product, which may contain instructions that when the computer program product runs on a computer, the computer can execute the first aspect or any one of the possible designs of the first aspect. , Or the method described in the above-mentioned second aspect or any one of the possible designs of the second aspect.
  • the present application provides a chip and/or a chip system including the chip, and the chip may include a processor.
  • the chip may also include a memory (or storage module) and/or a communication interface (or communication module).
  • the chip can be used to implement the method described in the foregoing first aspect or any one of the possible designs of the first aspect, or the foregoing second aspect or any one of the possible designs of the second aspect.
  • the chip system may be composed of the above-mentioned chips, or may include the above-mentioned chips and other discrete devices, such as a memory (or storage module), a communication interface, and/or a communication interface (or communication module).
  • FIG. 1 is a schematic diagram of the architecture of a communication system provided by an embodiment of this application.
  • FIG. 2 is a schematic diagram of a structural flow chart of an OFDM symbol sequence corresponding to a signal frame according to an embodiment of the application;
  • FIG. 3 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 4 is a schematic diagram of the structure flow of another OFDM symbol sequence corresponding to a signal frame provided by an embodiment of the application;
  • FIG. 5 is a schematic diagram of a frame header structure of a signal frame provided by an embodiment of the application.
  • FIG. 6 is a schematic diagram of a signal frame sending sequence provided by an embodiment of the application.
  • FIG. 7 is a schematic flowchart of a communication method provided by an embodiment of this application.
  • FIG. 8 is a schematic diagram of another signal frame sending sequence provided by an embodiment of the application.
  • FIG. 9 is a schematic flowchart of another communication method provided by an embodiment of this application.
  • FIG. 10 is a schematic structural diagram of a communication device provided by an embodiment of this application.
  • FIG. 11 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 12 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • FIG. 13 is a schematic structural diagram of another communication device provided by an embodiment of this application.
  • the communication method provided in the embodiments of this application can be used in wired or wireless communication systems such as power line communication (PLC) or broadband over power line (BPL) communication systems to improve the simultaneous performance of these communication systems.
  • PLC power line communication
  • BPL broadband over power line
  • An exemplary PLC communication system may have the architecture shown in FIG. 1.
  • the power line communication system may include power lines, gateway devices, multiple power line communication devices, and terminals and other network equipment. Among them, power lines are used to transmit power signals, and voltage signals can be used to drive electrical appliances.
  • the gateway device is connected to the Internet to provide Internet access.
  • the power line communication device may include a gateway side power line communication device (for example, the first power line communication device shown in FIG. 1), and the gateway side power line communication device is connected to the gateway device.
  • the power line communication device may further include a terminal-side power line communication device (for example, the second power line communication device shown in FIG. 1) for providing network signals to network-using devices such as terminals.
  • the first power line communication device may receive the data sent from the Internet to the terminal from the gateway device.
  • the first power line communication device can also modulate the data from the gateway to the PLC signal and couple it to the power line, so that the power line can be used to forward data.
  • the second power line communication device can be used to demodulate the PLC signal transmitted by the power line to obtain data, and forward the demodulated data to the terminal wirelessly, etc., so that the terminal and other network devices can receive the data from the Internet side .
  • the system shown in Figure 1 can also realize data transmission from the terminal to the Internet side.
  • the above power line communication equipment may be a power modem or other types of power line communication modems, which is not specifically limited in this application.
  • the first power line communication device and/or the second power line communication device as shown in FIG. 1 transmit data
  • the first power line communication device and/or the second power line communication device carry the data packet to be sent in the signal frame
  • the signal is modulated into an OFDM symbol sequence
  • the OFDM symbol sequence is further transmitted through the first frequency band signal and/or the second frequency band signal.
  • the receiving end power line communication device can obtain a signal frame through demodulation, and further analyze the data packet according to the signal frame.
  • the OFDM symbol sequence obtained by converting the signal frame to the time domain may include a preamble symbol, a frame header symbol, and a data carrier symbol.
  • the preamble symbol is obtained by converting the preamble of the signal frame, and can be used for synchronization.
  • the preamble symbol can also be used for initial channel estimation (initial channel estimation) and for automatic gain control (AGC), etc.
  • the header symbol can be converted from the header of the signal frame.
  • the frame header symbol may include some parameter information of the physical (PHY) layer, such as the identification (ID) of the transmitting end power line communication device (also known as the source identification (SID)), the receiving end power line The ID of the communication device (also referred to as the destination identification (DID)), etc.
  • the frame header symbol may be composed of at least one continuous OFDM symbol.
  • the data carrier symbol can be used to carry the payload of a signal frame, and the payload can carry data information, such as a data packet.
  • the OFDM symbol sequence corresponding to the signal frame may further include additional channel estimation (ACE) symbols, and the additional channel estimation symbols are obtained by converting the additional channel estimation information of the signal frame.
  • the additional channel estimation symbol may be located between the frame header symbol and the data carrier symbol, and may be carried on at least one OFDM symbol, which is not limited in this application.
  • the additional channel estimation symbols can be used to extract the data information carried by the data carrier symbols.
  • the second frequency band signal frame when the first frequency band signal frame and the second frequency band signal frame are simultaneously transmitted, the second frequency band signal frame can be synchronized through the preamble symbol of the first frequency band signal frame, so the second frequency band signal frame can be synchronized.
  • the OFDM symbol sequence of the frequency band signal frame may not include the preamble symbol to reduce the communication overhead of the second frequency band.
  • the communication method provided by the embodiments of the present application can be executed by the transmitting end power line communication device (or called the transmitting end) and the receiving end power to the communication device (or called the receiving end). As shown in Figure 3, the method may specifically include the following steps:
  • the transmitting end modulates the first signal frame into a first OFDM symbol sequence, and modulates a part of the second signal frame except the preamble sequence into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence includes multiple OFDM symbols
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the first signal frame is from the first signal frame.
  • a frequency band is converted from a signal obtained at a first sampling rate
  • the second signal frame is converted from a signal obtained at a second frequency band at a second sampling rate.
  • the first sampling rate is the second sampling rate.
  • the above-mentioned first signal frame and the above-mentioned second signal frame are data signals, which are obtained by sampling analog signals in the device and then converting them.
  • the first signal frame is obtained by sampling at the aforementioned first sampling rate
  • the second signal frame is obtained by sampling at the aforementioned second sampling rate.
  • the sampling rate is used to indicate how many trillion samples can be sampled per second, and the unit can be the number of megasamples per second (MSa/s). If the first frequency band is the passband in power line communication, the first sampling rate is 200 MSa/s. If the second frequency band is the baseband in power line communication, the second sampling rate is 800 MSa/s.
  • the transmitting end can first identify the preamble sequence in the signal frame, discard it, and perform processing on the other parts of the second signal frame. modulation.
  • the sending end may identify other parts of the second signal frame except the preamble sequence, and modulate these parts (or in other words, ignore the modulation of the preamble sequence in the second signal frame).
  • the sending end sends the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, sends the first OFDM symbol in the second OFDM symbol sequence.
  • the cut-off point of the nth OFDM symbol in the first OFDM symbol sequence is aligned with the start point of the first OFDM symbol in the second OFDM symbol sequence (alignment refers to time consistency).
  • the transmitting end sends the second OFDM symbol sequence starting from the cutoff point of the nth OFDM symbol in the first OFDM symbol sequence.
  • the cut-off point for sending the nth OFDM symbol refers to the cutoff time for the sending end to send the nth OFDM symbol; the starting point for sending the first OFDM symbol refers to the sending end to start sending the first OFDM symbol The moment.
  • the first OFDM symbol sequence is carried in the first frequency band (or the first OFDM symbol sequence is transmitted through the first frequency band), and the second OFDM symbol sequence is carried in the second frequency band (or the second frequency band).
  • the OFDM symbol sequence is sent through the second frequency band).
  • the receiving end receives the first OFDM symbol sequence.
  • S103 The receiving end synchronizes the first signal frame according to the preamble symbol included in the first OFDM symbol sequence.
  • the receiving end receives the first OFDM symbol in the second OFDM symbol sequence from the cutoff point of the nth OFDM symbol in the first OFDM symbol sequence. Or in other words, the receiving end receives the second OFDM symbol sequence from the cutoff point of the nth OFDM symbol in the first OFDM symbol sequence.
  • the cut-off point for receiving the nth OFDM symbol refers to the cutoff time for the receiving end to receive the nth OFDM symbol; the starting point for receiving the first OFDM symbol refers to the receiving end to start receiving the first OFDM symbol The moment.
  • the second OFDM symbol sequence does not include a preamble symbol
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band
  • n is a positive integer
  • the cut-off point of the nth OFDM symbol of the transmitting end of the first OFDM symbol sequence is aligned with the starting point of the first OFDM symbol of the transmitting end of the second OFDM symbol sequence.
  • the above first frequency band may be a passband in power line communication.
  • the second frequency band may be the baseband in power line communication.
  • the second OFDM symbol sequence may include frame header symbols and data carrier symbols. Since the preamble symbol is not included, when the same data is carried, the length of the second OFDM symbol sequence is smaller than the length of the OFDM symbol sequence corresponding to the signal frame containing the preamble symbol.
  • the frame header of the second signal frame may include a pilot signal (pilot tone), where the pilot signal may be used by the receiving end to extract the management information carried in the frame header.
  • the management information can be used to receive data carrier symbols in the second OFDM symbol sequence, and can be used to receive additional channel estimation symbols when the second OFDM symbol sequence includes additional channel estimation symbols.
  • the pilot signal may be set at the frame header of the second signal frame at equal intervals in units of subcarriers.
  • each pilot signal can occupy one sub-carrier
  • the interval between two adjacent pilot signals can be k sub-carriers
  • the remaining sub-carriers not occupied by the pilot signal can be used to carry forward error correction Code (forward error correction, FEC) encoding and repetition (repetition) frame header information
  • FEC forward error correction
  • FEC forward error correction
  • repetition repetition
  • frame header information such as management information
  • the transmitting end may also indicate to the receiving end to transmit the first OFDM symbol in the second OFDM symbol sequence at the cutoff point of transmitting the nth OFDM symbol in the first OFDM symbol sequence.
  • the first signal frame may carry indication information.
  • the indication information may be used to determine the cut-off point for the transmitting end to transmit the nth OFDM symbol in the first OFDM symbol sequence to transmit the first OFDM symbol of the second signal frame.
  • the indication information may be used to determine that the cut-off point of the nth OFDM symbol in the first OFDM symbol sequence is aligned with the start point of the first OFDM symbol in the second OFDM symbol sequence.
  • the indication information can be used to determine that the sending end starts sending the second signal frame from the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence. Therefore, the receiving end may receive the first OFDM symbol in the second OFDM symbol sequence from the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence according to the indication information in the first signal frame.
  • the indication information may be represented by a specific bit in the first signal frame.
  • the specific bit in the first signal frame has a value of 0, it means that the transmitting end is not sending any data in the first OFDM symbol sequence.
  • the cut-off point of the nth OFDM symbol sends the first OFDM symbol in the second OFDM symbol sequence; when the specific bit in the first signal frame has a value of 1, it means that the sender is sending the first OFDM symbol sequence
  • the first OFDM symbol in the second OFDM symbol sequence is aligned at the cutoff point of the nth OFDM symbol.
  • n takes a fixed value, such as 1 or other values
  • the receiving end can determine that the first OFDM symbol sequence is received from the first OFDM symbol sequence.
  • the cutoff point of the symbol starts to receive the first OFDM symbol of the second OFDM symbol sequence.
  • the value of n may also be indicated by other information in the first signal frame or information other than the first signal frame.
  • the sending end can instruct the receiving end through indication information, so that the receiving end can determine whether to detect an OFDM symbol sequence that does not contain a preamble symbol in the second frequency band (ie, the second signal frame provided by this application), when the first signal frame
  • the receiving end determines that there is no need to detect the OFDM symbol sequence that does not include the preamble symbol in the second frequency band.
  • the receiving end can detect the OFDM symbol sequence carrying the preamble symbol transmitted in the second frequency band, or in other words, the receiving end can synchronize the signal frame according to the preamble symbol of the signal frame transmitted in the second frequency band.
  • the indication information can also be used to determine the value of n, so that the receiving end can determine the cutoff point of which OFDM symbol of the first OFDM symbol sequence is sent by the sending end, and send the second OFDM symbol sequence.
  • the first OFDM symbol to improve transmission reliability.
  • the receiving end may not receive the first OFDM symbol in the second OFDM symbol sequence from the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the receiving end can detect the OFDM symbol sequence carrying the preamble symbol transmitted in the second frequency band according to the existing method (such as the carrier in the prior art or future technology).
  • the OFDM symbol sequence carrying the preamble symbol in the second frequency band), and the signal frame corresponding to the OFDM symbol sequence is obtained by demodulating.
  • the above-mentioned indication information may further include: information for determining that the sending end sends the first OFDM symbol in the second OFDM symbol sequence at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence (specific settings
  • the manner can refer to the description of the indication information in the above-mentioned first possible example), and includes information for indicating the value of n (for the specific setting manner, refer to the description of the indication information in the above-mentioned second possible example).
  • the above-mentioned indication information may be included in the frame header of the first signal frame.
  • the indication information can also be sent separately from the first signal frame.
  • the sending end sends the OFDM symbol sequence corresponding to the indication information before sending the first OFDM symbol sequence.
  • a communication method provided by an embodiment of the present application is introduced.
  • the sending end determines that the OFDM symbol sequence carried in the first frequency band is not detected in the communication medium (or in other words, the sending end does not detect that the OFDM symbol sequence is being transmitted in the first frequency band).
  • the communication medium has the transmission of the OFDM symbol sequence carried in the first frequency band
  • the transmitting end determines that the OFDM symbol sequence carried in the second frequency band is not detected (in other words, the transmitting end does not detect that the communication medium has the transmission of the second frequency band).
  • the sending end may send the first OFDM symbol sequence, and at the cutoff point of sending the preamble symbol in the first OFDM symbol sequence (for example, the first OFDM symbol in the first OFDM symbol sequence), Send the first OFDM symbol in the second OFDM symbol sequence.
  • the sending end or the receiving end can detect whether there is transmission of an OFDM symbol sequence in the current communication medium.
  • the communication medium can refer to the power line, and the transmitting end or the receiving end can detect whether there is an OFDM symbol sequence transmitted on the power line.
  • the communication medium may be a wireless air interface.
  • the receiving end before the receiving end detects the first OFDM symbol sequence transmitted in the communication medium, if the receiving end determines that the OFDM symbol sequence carried in the first frequency band and the OFDM symbol sequence carried in the second frequency band are not detected, the receiving end The first OFDM symbol of the second OFDM symbol sequence may be received at the cut-off point of receiving the preamble symbol in the first OFDM symbol sequence.
  • the frame header symbol of the first signal frame may carry indication information, which is used to determine that the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the preamble symbol in the first OFDM symbol sequence.
  • the header symbol of the first signal frame may carry the indication information.
  • the receiving end can also learn according to the indication information to receive the first OFDM symbol in the second OFDM symbol sequence from the cut-off point of receiving the preamble symbol in the first OFDM symbol sequence.
  • the receiving end when the first signal frame does not include the indication information, the receiving end can also be set to detect the OFDM symbol sequence of the signal frame transmitted in the second frequency band according to the prior art.
  • the OFDM symbol sequence of the signal frame transmitted in the second frequency band includes the preamble symbol
  • the receiving end can synchronize according to the preamble symbol and extract the frame header symbol of the OFDM symbol sequence according to the preamble symbol. Management information in.
  • the communication method provided in the example may include the following steps:
  • the first power line communication device determines that it has not detected that the OFDM symbol sequence carried in the passband and the OFDM symbol sequence carried in the baseband are transmitted in the power line.
  • the first power line communication device modulates the first signal frame into a first OFDM symbol sequence, and modulates a part of the second signal frame except the preamble sequence into a second OFDM symbol sequence. Therefore, the second OFDM symbol sequence does not contain the preamble symbol.
  • the frame header of the second signal frame may include a pilot signal for extracting management information in the frame header symbol of the second signal frame.
  • the first power line communication device sends the first OFDM symbol sequence, and sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the preamble symbol in the first OFDM symbol sequence.
  • the OFDM symbol sequence of the first signal frame is carried in the passband, and the second OFDM symbol sequence is carried in the baseband.
  • the second power line communication device receives the first OFDM symbol sequence, and determines that before detecting the first OFDM symbol sequence, the power line does not detect the OFDM symbol sequence carrying the signal frame carried in the passband and the signal carried in the baseband.
  • the OFDM symbol sequence of the frame is not detected.
  • the second power line communication device performs synchronization according to the preamble symbol of the first OFDM symbol sequence, and receives the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the preamble symbol in the first OFDM symbol sequence.
  • the second power line communication device extracts the management information in the header symbol of the first signal frame according to the preamble symbol in the first OFDM symbol sequence, and determines that the sending end is sending the first OFDM symbol according to the indication information contained in the management information
  • the cutoff point of the preamble symbol in the sequence transmits the first OFDM symbol in the second OFDM symbol sequence.
  • the second power line communication device may perform passband channel estimation according to the preamble symbol in the first OFDM symbol sequence to obtain the passband channel equalization coefficient, and extract the management information in the header symbol of the first signal frame according to the coefficient.
  • the second power line communication device may obtain the information carried by the data carrier symbol of the first signal frame according to the management information in the header symbol of the first signal frame.
  • the second power line communication device may receive the additional channel estimation symbols and data carrier symbols of the first signal frame according to the management information in the header symbols of the first signal frame, and perform channel estimation according to the additional channel estimation symbols to obtain channel equalization.
  • the coefficient is used to obtain the information carried by the data carrier symbol of the first signal frame.
  • the second power line communication device obtains the first OFDM symbol according to the frame header symbol in the second OFDM symbol sequence (that is, the first OFDM symbol, because the second OFDM symbol sequence does not contain the preamble symbol, so the first OFDM symbol is the frame header symbol).
  • the frame header of the frequency domain of the second signal frame is the first OFDM symbol according to the frame header symbol in the second OFDM symbol sequence (that is, the first OFDM symbol, because the second OFDM symbol sequence does not contain the preamble symbol, so the first OFDM symbol is the frame header symbol).
  • the second power line communication device may perform automatic power gain adjustment of the signal according to the first 1024 time-domain points in the cyclic preamble of the frame header symbol in the second OFDM symbol sequence, and perform automatic power gain adjustment on the first signal frame of the second signal frame.
  • the OFDM symbol is subjected to Fourier transform to obtain the frame header of the second signal frame.
  • the second power line communication device extracts the management information in the second signal frame according to the pilot signal in the frame header of the second signal frame.
  • the second power line communication device may extract the pilot signal in the frame header of the second signal frame, perform channel estimation by interpolation, and obtain the baseband channel equalization coefficient, so that the management information in the second signal frame may be extracted.
  • the second power line communication device acquires the information carried by the data carrier symbol of the second signal frame according to the management information in the frame header of the second signal frame.
  • the second power line communication device may receive the additional channel estimation symbols and data carrier symbols of the second signal frame according to the management information, and perform channel estimation according to the additional channel estimation symbols to obtain the channel equalization coefficient, which is used to obtain the data carrier symbols carried Data information.
  • the sending end before sending the first OFDM symbol sequence, if the sending end determines that the OFDM symbol sequence carried in the second frequency band transmitted in the communication medium is detected (the OFDM symbol sequence may be referred to as the third OFDM symbol sequence hereinafter), Then, as shown in Figure 8, the sending end can carry the indication information in the first signal frame.
  • the indication information may be used to determine that the sending end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence.
  • the header symbol of the first signal frame may carry the indication information.
  • the sending end may send the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the first OFDM symbol in the second OFDM symbol sequence.
  • the cut-off point of the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain.
  • the transmitting end may also determine the nth modulation symbol from the N OFDM symbols included in the first OFDM symbol sequence, where n and N are positive integers, and N ⁇ n.
  • the receiving end when the receiving end detects the first OFDM symbol sequence carried in the first frequency band, if the receiving end determines that the third OFDM symbol sequence carried in the second frequency band is also transmitted in the communication medium, the receiving end can follow the first
  • the indication information carried in the signal frame determines the cutoff point of the transmitting end at the nth OFDM symbol in the first OFDM symbol sequence, and sends the first OFDM symbol in the second OFDM symbol sequence. Therefore, the receiving end may start to receive the first OFDM symbol in the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the receiving end can also be set to detect the OFDM symbol sequence of the signal frame transmitted in the second frequency band according to the prior art.
  • the OFDM symbol sequence of the signal frame transmitted in the second frequency band includes the preamble symbol, and the receiving end can synchronize according to the preamble symbol and extract the management information in the frame header symbol according to the preamble symbol .
  • the transmitting end can determine whether to trigger the transmission of the second OFDM symbol sequence according to the OFDM symbol sequence of the first signal frame according to the resource scheduling situation (or in other words, determine Whether to send the first OFDM symbol of the second signal frame at the cutoff point of sending the nth OFDM symbol of the first signal frame). For example, if the time domain resources available for sending the OFDM symbol sequence of the second frequency band are insufficient to send the second OFDM symbol sequence, the sending end may determine not to use the first signal frame to trigger the sending of the second signal frame.
  • the cut-off point for transmitting all N OFDM symbols of the first signal frame overlaps with the OFDM symbol sequence of the signal frame carried by the second frequency band (including but not limited to the third OFDM symbol sequence). If the two signal frames may cause signal conflicts, it can be determined that the first OFDM symbol sequence is not used to trigger the transmission of the second OFDM symbol sequence.
  • the sending end determines that the sending of the second OFDM symbol sequence can be triggered according to the first OFDM symbol sequence corresponding to the first signal frame, the sending end can carry the indication information in the first signal frame, so that the receiving end can determine that it is receiving according to the indication information.
  • the cut-off point of the nth OFDM symbol of the first signal frame starts to receive the second signal frame. Otherwise, if the transmitting end determines that the transmission of the second OFDM symbol sequence cannot be triggered according to the OFDM symbol sequence of the first signal frame, the transmitting end does not carry indication information in the first signal frame, so that the receiving end determines not to trigger the transmission of the second OFDM symbol sequence according to the first signal frame.
  • the cut-off point of the n OFDM symbols is used to receive the second signal frame.
  • the transmitting end can transmit the OFDM symbol sequence containing the preamble symbol through the second frequency band, so that the receiving end can detect and receive the OFDM symbol sequence carrying the preamble symbol.
  • the sending end may carry another indication information in the first signal frame to indicate that the receiving end does not follow the first signal frame.
  • the second signal frame is received at the cut-off point of the nth OFDM symbol of the signal frame.
  • the communication method provided in the example may include the following steps:
  • the first power line communication device determines that a third OFDM symbol sequence carried on the baseband is detected.
  • the first power line communication device determines the nth OFDM symbol from the N OFDM symbols, modulates the first signal frame into the first OFDM symbol sequence, and modulates the second signal frame except the preamble sequence into the second signal frame. OFDM symbol sequence. Therefore, the second OFDM symbol sequence does not contain the preamble symbol.
  • the N OFDM symbols are OFDM symbols included in the first OFDM symbol sequence, and the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain.
  • the header symbol of the first signal frame includes indication information for determining to send the first OFDM symbol in the second OFDM symbol sequence at the cut-off point for sending the preamble symbol in the first OFDM symbol sequence.
  • the frame header of the second signal frame may include a pilot signal for extracting management information in the frame header symbol of the second signal frame.
  • the first power line communication device sends the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, sends the first OFDM symbol in the second OFDM symbol sequence.
  • the OFDM symbol sequence of the first signal frame is carried in the passband, and the second OFDM symbol sequence is carried in the baseband.
  • the second power line communication device receives the first OFDM symbol sequence, and determines that before receiving the first OFDM symbol sequence, it detects the third OFDM symbol sequence carried in the baseband.
  • the second power line communication device performs synchronization according to the preamble symbol in the first OFDM symbol sequence.
  • the second power line communication device extracts the management information in the header symbol of the first signal frame according to the preamble symbol in the first OFDM symbol sequence, and determines, according to the indication information contained in the management information, that the sending end is sending the first OFDM symbol sequence At the cutoff point of the nth OFDM symbol in, the first OFDM in the second OFDM symbol sequence is sent.
  • the second power line communication device may perform passband channel estimation according to the preamble symbol in the first OFDM symbol sequence to obtain the passband channel equalization coefficient, and extract the management information in the header symbol of the first signal frame according to the coefficient.
  • the second power line communication device may obtain the information carried by the data carrier symbol of the first signal frame according to the management information in the header symbol of the first signal frame.
  • the second power line communication device may receive the additional channel estimation symbols and data carrier symbols of the first signal frame according to the management information in the header symbols of the first signal frame, and perform channel estimation according to the additional channel estimation symbols to obtain channel equalization.
  • the coefficient is used to obtain the information carried by the symbol of the data carrier.
  • the second power line communication device receives the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the second power line communication device obtains the frequency domain frame header of the second signal frame according to the frame header symbols in the second OFDM symbol sequence.
  • the second power line communication device may perform automatic power gain adjustment of the signal according to the first 1024 time-domain points in the cyclic preamble of the frame header symbol (that is, the first OFDM symbol) in the second OFDM symbol sequence, and Fourier transform is performed on the first OFDM symbol of the second signal frame to obtain the frame header of the second signal frame.
  • the second power line communication device extracts the management information in the second signal frame according to the pilot signal in the frame header of the second signal frame.
  • the second power line communication device may extract the pilot signal in the frame header of the second signal frame, perform channel estimation by interpolation, and obtain the baseband channel equalization coefficient, so that the management information in the second signal frame may be extracted.
  • the second power line communication device obtains the information carried by the data carrier symbol of the second signal frame according to the management information in the frame header of the second signal frame.
  • the second power line communication device may manage the information to receive the additional channel estimation symbols and data carrier symbols of the second signal frame, and perform channel estimation according to the additional channel estimation symbols to obtain the channel equalization coefficient, which is used to obtain the information carried by the data carrier symbols .
  • the communication method and method flow provided in the embodiments of the present application are introduced from the perspective of the functions respectively implemented by the sending end and the receiving end.
  • the sending end and the receiving end may respectively include a hardware structure and/or a software module, and the foregoing may be implemented in the form of a hardware structure, a software module, or a hardware structure plus a software module.
  • whether a certain function of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.
  • a communication device 1000 provided by an embodiment of the present application may include a communication module 1001 and a processing module 1002, and the communication module 1001 and the processing module 1002 are coupled with each other.
  • the communication device 1000 can be used to execute the steps executed by the sending end in the above method embodiments.
  • the communication module 1001 can be used to support the communication device 1000 to communicate.
  • the communication module 1001 can have a communication function, for example, can receive and/or send data frames through a wired and/or wireless communication medium such as a power line.
  • the processing module 1002 can be used to support the communication device 1000 to perform the processing actions of the sending end in the foregoing method embodiments, including but not limited to: generating information and messages sent by the communication module 1001, and/or decoding signals received by the communication module 1001 Adjust and decode, determine communication parameters based on the received data frame, and so on.
  • the above processing module 1002 can be used to modulate the first signal frame into the first OFDM symbol sequence, and modulate the part of the second signal frame except the preamble sequence into The second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the communication module 1001 may be configured to send a first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the first OFDM symbol in the second OFDM symbol sequence, where n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame includes indication information.
  • the indication information can be used to determine the cut-off point of the transmitting end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the processing module 1002 when the processing module 1002 can also determine that the third OFDM symbol sequence of the second frequency band is detected, the processing module 1002 can also be used to determine the nth OFDM symbol from the N OFDM symbols, and The N OFDM symbols are OFDM symbols included in the first OFDM symbol sequence, the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain, N is a positive integer, and n is less than N. And, the processing module 1002 may generate the above-mentioned indication information, and the indication information may be used to determine the value of n.
  • the processing module 1002 determines that the OFDM symbol sequence carried in the first frequency band and the OFDM symbol sequence carried in the second frequency band are not detected, the communication module 1001 may be specifically configured to transmit the first frequency band. At the cutoff point of the preamble symbol of the OFDM symbol sequence, the first OFDM symbol in the second OFDM symbol sequence is sent.
  • the communication device may also include the structure shown in FIG. 11. It can be seen that the communication device 1100 may include a processor 1101, a memory 1102 and a communication interface 1103.
  • the above processor 1101 can be used to process the communication protocol and communication data, control the communication device, execute the software program, process the data of the software program, and so on.
  • the memory 1102 may be used to store instructions (or programs) and data, and the processor 1101 may execute the method executed by the sending end in the embodiment of the present application based on the instructions.
  • the communication interface 1103 can be used in the present application for the communication device 1100 to perform wired communication, for example, to receive signals transmitted through power lines, and to send signals through power lines.
  • the above processor 1101 may be used to execute the above steps executed by the processing module 1002.
  • the communication interface 1103 can be used to perform the steps performed by the communication module 1001 described above.
  • the processor 1101 may be configured to modulate the first signal frame into a first OFDM symbol sequence, and modulate a part of the second signal frame except the preamble sequence into a second OFDM symbol sequence.
  • the first signal frame and the second signal frame respectively include a preamble sequence
  • the first OFDM symbol sequence may include a plurality of OFDM symbols
  • the second OFDM symbol sequence may include at least one OFDM symbol.
  • the first signal frame is converted from a signal obtained through a first sampling rate on a first frequency band (such as the passband in power line communication), and the second signal frame is converted from a second frequency band (such as the baseband in power line communication)
  • the above is converted from the signal obtained through the second sampling rate, the first sampling rate is m times the second sampling rate, m is a positive integer and m is greater than or equal to 2.
  • the communication interface 1103 may be used to send the first OFDM symbol sequence, and at the cutoff point of sending the nth OFDM symbol in the first OFDM symbol sequence, send the first OFDM symbol in the second OFDM symbol sequence, where n is a positive integer.
  • the first signal frame is carried in the first frequency band
  • the second signal frame is carried in the second frequency band.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame includes indication information.
  • the indication information can be used to determine the cut-off point of the transmitting end at sending the nth OFDM symbol in the first OFDM symbol sequence, and the first OFDM symbol in the second OFDM symbol sequence is sent. And/or, the indication information can be used to determine the value of n.
  • the processor 1101 when the processor 1101 can also determine that the third OFDM symbol sequence of the second frequency band is detected, the processor 1101 can also be configured to determine the nth OFDM symbol from the N OFDM symbols, and the The N OFDM symbols are OFDM symbols included in the first OFDM symbol sequence, the cutoff point for transmitting the nth OFDM symbol does not overlap with the third OFDM symbol sequence in the time domain, N is a positive integer, and n is less than N. And, the processor 1101 may generate the foregoing indication information, and the indication information may be used to determine the value of n.
  • the communication interface 1103 may be specifically used to transmit the first frequency band. At the cutoff point of the preamble symbol of the OFDM symbol sequence, the first OFDM symbol in the second OFDM symbol sequence is sent.
  • the above communication device may also be composed of a chip.
  • the chip includes a processor 1101.
  • the chip may also be coupled with any one or more components in the memory 1102 or the communication interface 1103.
  • another communication device 1200 may include a communication module 1201 and a processing module 1202, and the communication module 1201 and the processing module 1202 are coupled with each other.
  • the communication device 1200 can be used to perform the steps performed by the sending end in the above method embodiments.
  • the communication module 1201 can be used to support the communication device 1200 to communicate.
  • the communication module 1201 can have a communication function, for example, can receive and/or send data frames through a wired and/or wireless communication medium such as a power line.
  • the processing module 1202 can be used to support the communication device 1200 to perform the processing actions of the sending end in the foregoing method embodiments, including but not limited to: generating information and messages sent by the communication module 1201, and/or decoding signals received by the communication module 1201 Adjust and decode, determine communication parameters based on the received data frame, and so on.
  • the communication module 1201 may be used to receive the first OFDM symbol sequence transmitted through the first frequency band (such as the passband in power line communication).
  • the processing module 1202 may synchronize the first signal frame according to the preamble symbol, and the preamble symbol is included in the first OFDM symbol sequence.
  • the first OFDM symbol sequence is carried in the first frequency band
  • the first OFDM symbol sequence includes a plurality of OFDM symbols
  • the first OFDM symbol sequence is modulated according to a first signal frame
  • the first signal frame includes a preamble.
  • the first signal frame is converted from a signal obtained through a first sampling rate on the first frequency band.
  • the communication module 1201 can also be used to receive the first OFDM symbol sequence in the second OFDM symbol sequence through a second frequency band (such as the baseband in power line communication) at the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • OFDM symbol, n is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine that the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence. And/or, the indication information can be used to determine the value of n.
  • the indication information is used to determine the value of n.
  • the processing module 1202 may determine the value of n according to the indication information.
  • the nth OFDM symbol so that the communication module 1201 may receive the first OFDM symbol of the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the processing module 1202 may receive the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the preamble symbol of the first OFDM symbol sequence.
  • the communication device may also include a structure as shown in FIG. 13. It can be seen that the communication device 1300 may include a processor 1301, a memory 1302, and a communication interface 1303.
  • the above processor 1301 can be used to process the communication protocol and communication data, control the communication device, execute the software program, and process the data of the software program.
  • the memory 1302 may be used to store instructions (or programs) and data, and the processor 1301 may execute the methods executed by the receiving end in the embodiments of the present application based on the instructions.
  • the communication interface 1303 can be used for the communication device 1300 to perform wired communication in the present application, for example, to receive signals transmitted through power lines, and to send signals through power lines.
  • the above processor 1301 may be used to execute the above steps executed by the processing module 1202.
  • the communication interface 1303 can be used to perform the steps performed by the communication module 1201 described above.
  • the communication interface 1303 may be used to receive the first OFDM symbol sequence transmitted through the first frequency band (such as the passband in power line communication).
  • the processor 1301 may synchronize the first signal frame according to the preamble symbol, and the preamble symbol is included in the first OFDM symbol sequence.
  • the first OFDM symbol sequence is carried in the first frequency band
  • the first OFDM symbol sequence includes a plurality of OFDM symbols
  • the first OFDM symbol sequence is modulated according to a first signal frame
  • the first signal frame includes a preamble.
  • the first signal frame is converted from a signal obtained through a first sampling rate on the first frequency band.
  • the communication interface 1303 can also be used to receive the first OFDM symbol sequence in the second frequency band (such as the baseband in power line communication) at the cut-off point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • OFDM symbol, n is a positive integer.
  • the second OFDM symbol sequence includes at least one OFDM symbol
  • the second OFDM symbol sequence is obtained by modulating a part of the second signal frame excluding the preamble sequence
  • the second signal frame includes the preamble sequence
  • the second signal frame The frame is converted from the signal obtained through the second sampling rate on the second frequency band
  • the first sampling rate is m times the second sampling rate
  • m is a positive integer
  • m is greater than or equal to 2.
  • the second signal frame includes a pilot signal.
  • the frame header of the first signal frame may include indication information.
  • the indication information may be used to determine that the transmitting end sends the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence. And/or, the indication information can be used to determine the value of n.
  • the indication information is used to determine the value of n.
  • the processor 1301 may determine the value of n according to the indication information.
  • the nth OFDM symbol so that the communication interface 1303 can receive the first OFDM symbol of the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence.
  • the The communication interface 1303 may receive the first OFDM symbol in the second OFDM symbol sequence at the cut-off point of receiving the preamble symbol of the first OFDM symbol sequence.
  • the above communication device may also be composed of a chip.
  • the chip includes a processor 1301.
  • the chip may also be coupled with any one or more components in the memory 1302 or the communication interface 1303.
  • the embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored.
  • the program is executed by a processor, the computer executes the above method embodiment and method implementation.
  • the method executed by the sending end and/or the receiving end in any one of the possible implementations of the example.
  • this application also provides a computer program product, which when invoked and executed by a computer, enables the computer to implement the above method embodiment and any possible implementation of the method embodiment In the method executed by the sender and/or receiver.
  • the present application also provides a chip or a chip system, and the chip may include a processor.
  • the chip may also include a memory (or storage module) and/or a communication interface (or communication module), or the chip may be coupled with a memory (or storage module) and/or a communication interface (or communication module), wherein the communication interface ( (Or communication module) can be used to support the chip for wired and/or wireless communication, the memory (or storage module) can be used to store a program, and the processor can call the program to implement any one of the above method embodiments and method embodiments.
  • the method executed by the sender and/or receiver in the implementation of.
  • the chip system may include the above chips, or may include the above chips and other discrete devices, such as a memory (or storage module) and/or a communication interface (or communication module).
  • the present application also provides a communication system, which may include the above communication device and a transmitter.
  • the communication system can be used to implement the foregoing method embodiment and the method involved in any one of the possible implementation manners of the method embodiment.
  • the communication system may have a structure as shown in FIG. 1.
  • the transmitting end can be used to modulate the first signal frame into an OFDM symbol sequence containing preamble symbols, and can modulate the second signal frame into an OFDM symbol sequence containing no preamble symbols.
  • the sending end may first send the first OFDM symbol sequence, and at the cut-off point of sending the nth OFDM symbol in the first OFDM symbol sequence, send For the first OFDM symbol in the second OFDM symbol sequence, n is a positive integer.
  • the first signal frame is carried in a first frequency band (such as the passband in power line communication)
  • the second signal frame is carried in a second frequency band (such as the baseband in power line communication).
  • the receiving end may receive the first OFDM symbol sequence, and synchronize the first signal frame according to the preamble symbol, and the preamble symbol is included in the first OFDM symbol sequence. And, the receiving end may receive the first OFDM symbol in the second OFDM symbol sequence at the cutoff point of receiving the nth OFDM symbol in the first OFDM symbol sequence, where n is a positive integer.
  • the transmitting end may be the first power line communication device in the power line communication system described in FIG. 1, and the receiving end may be the second power line communication device in the power line communication system described in FIG. 1. Alternatively, the transmitting end may be the second power line communication device in the power line communication system described in FIG. 1, and the receiving end may be the first power line communication device in the power line communication system described in FIG. 1.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

本申请提供一种通信方法及装置。在采用双频带并发信号帧时，发送端可将第一信号帧调制为第一OFDM符号序列，将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。发送端可通过第一频带发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带发送第二OFDM符号序列中的第一个OFDM符号。本申请能够根据第一信号帧实现第二信号帧的时域同步，因此可在第二OFDM符号序列中省略前导符号，以降低第二频带的传输开销。另外，由于接收端不需要根据第二OFDM符号序列的前导符号对第二信号帧进行同步，因此节省了对第二信号帧进行同步产生的时延，提高了通信速率。

Description

一种通信方法及装置
本申请要求于2019年10月30日提交中国国家知识产权局、申请号为201911046203.3、发明名称为“一种通信方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在电力线通信(power line communication，PLC)中，可采用第一频带以及第二频带两个频段同时进行信号传输，从而提高通信容量，其中，第一频段的采样率为第二频段的采样率的m倍，m≥2。例如，第一频带为通带(pass band)频段，第二频带为基带(base band)频段。其中，基带可以是2至80兆赫兹(MHz)的子载波传输信号，通带可以是110至400MHz的子载波传输信号。
在进行通信时，电力线通信系统可仅通过第一频带进行传输或仅通过第二频带进行信号帧的传输。此外，电力线通信系统还可在共用的传输时隙内分别通过第一频带以及第二频带进行信号帧的传输，此种传输方式可称为双频带并发通信。
目前的电力线通信技术中，当电力线通信系统采用双频带并发通信时，第一频带信号帧和第二频带信号帧是独立收发的，因此第一频带信号帧对应的OFDM符号序列和第二频带信号帧对应的OFDM符号序列都需要携带前导符号(preamble)，以便进行信号帧同步，其中，每个前导符号占用一个或多个正交频分复用(orthogonal frequency division multiplexing，OFDM)符号。然而，第二频带信号帧对应的前导符号会占用第二频带过多的传输资源，开销较大。
发明内容
本申请提供一种通信方法及装置，用以降低电力线通信系统中采用双频带并发时，采样率较低的第二频带开销较大的问题。
第一方面，本申请提供一种通信方法，该通信方法可由发送端通信设备(以下可简称为发送端)或发送端中的芯片实施，该发送端可用于信号帧的发送。示例性的，通信设备可以是电力猫等电力线通信调制解调器，或其他有线、无线通信设备。
根据该方法，在采用双频带并发信号帧时，发送端可将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号(以下可简称为符号)，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。当发送第一OFDM符号序列以及第二OFDM符号序列时，发送端可首先发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该 第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。
采用以上方法，发送端发送第一OFDM符号序列第n个OFDM符号的截止点，和发送端发送第二OFDM符号序列的第一个OFDM符号的起始点是对齐的。当接收端根据第一OFDM符号序列中的前导符号对第一信号帧进行同步，并从接收该第n个OFDM符号的截止点开始接收第二OFDM符号序列时，能够实现第二信号帧的时域同步，因此可在第二OFDM符号序列时省略前导符号，以降低第二频带的传输开销。另外，由于接收端不需要根据第二OFDM符号序列的前导符号对第二信号帧进行同步，因此节省了对第二信号帧进行同步产生的时延，提高了通信速率。
示例性的，第二信号帧中可包含导频信号。导频信号可用于对第二信号帧的帧头符号进行信道估计，以提取第二信号帧的帧头携带的管理信息，从而降低由于第二OFDM符号序列不包含前导符号所带来的管理信息的提取难度。
示例性的，第一信号帧的帧头中可包括指示信息。该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
采用该方法，接收端可根据第一信号帧中的指示信息，获知发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号，以便接收端从接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收该第二OFDM符号序列中的第一个OFDM符号。此外，当第一信号帧不包括指示信息时，接收端即确定不需要在第二频带检测不包含前导符号的OFDM符号序列。从而可由发送端对接收端是否按照本申请提供的通信方法接收承载于第二频带的OFDM符号序列进行控制，提高通信可靠性及灵活性。
在一种具体的示例中，当发送端确定检测到承载于第二频带的第三OFDM符号序列时，发送端可从N个OFDM符号中确定该第n个OFDM符号，该N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送该第n个OFDM符号的截止点不与该第三OFDM符号序列在时域重叠，N为正整数，n小于N。以及，发送端可生成上述指示信息，以通过该指示信息向接收端指示n的取值，以便接收端确定从接收第一OFDM符号序列的第n个OFDM符号的截至点，接收第二OFDM符号序列的第一个OFDM符号。
采用该方法，可避免第二OFDM符号序列与第三OFDM符号序列出现时域重叠，降低了信号干扰，从而提高传输质量。
在另一种具体的示例中，当发送端确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列时，发送端可发送第一OFDM符号序列，并在发送第一OFDM符号序列的前导符号的截止点，发送该第二OFDM符号序列中的第一个OFDM符号。
采用以上方法，发送端在发送第一OFDM符号序列的前导符号的截至点发送第二OFDM符号序列中的第一个OFDM符号，能够最大限度利用第二频带的时域传输资源，提高传输资源的利用率。
第二方面，本申请提供一种通信方法，该通信方法可由接收端通信设备(以下可简称为接收端)或发送端中的芯片实施，该接收端可用于信号帧的接收，其中，信号帧可由发送端发送。示例性的，通信设备可以是电力猫等电力线通信调制解调器，或其他有线、无线通信设备。
根据该方法，在采用双频带并发时，接收端可接收通过第一频带(如电力线通信中的通带)传输的第一OFDM符号序列，并根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。其中，该第一OFDM符号序列承载于该第一频带，该第一OFDM符号 序列包含多个OFDM符号，该第一OFDM符号序列是根据第一信号帧调制得到的，该第一信号帧包含前导序列，该第一信号帧是从该第一频带上通过第一采样率获得的信号转化来的。以及，接收端可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，该第二信号帧中可包括导频信号。导频信号可用于对第二信号帧的帧头符号进行信道估计，以提取第二信号帧的帧头携带的管理信息。
示例性的，该第一信号帧的帧头中可包括指示信息。该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
在一种具体的示例中，当接收端确定检测到承载于第二频带的第三OFDM符号序列时，接收端可根据该指示信息确定第n个OFDM符号，从而在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
在另一种具体的示例中，若接收端确定在接收到第一OFDM符号序列之前，未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，接收端可在接收第一OFDM符号序列中的前导符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号。
第三方面，本申请提供一种通信装置，该通信装置可以是发送端通信设备或发送端通信设备中的芯片。该通信装置可用于执行上述第一方面或第一方面的任一可能的设计中提供的功能或步骤或操作。该通信装置可通过硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各方法中的各功能或步骤或操作。比如，在通信装置中可以设置与上述各方法中的功能或步骤或操作相对应的功能模块来支持该通信装置执行上述方法。
在通过软件模块实现第三方面所示通信装置时，该通信装置可包括相互耦合的通信模块以及处理模块，其中，通信模块可用于支持通信装置进行通信，处理模块可用于通信装置执行处理操作，如生成需要通过通信模块发送的信息/消息，或对通信模块接收的信号进行处理以得到信息/消息。
示例性的，处理模块可用于将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。通信模块可用于发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
在一种具体的示例中，当该处理模块还可确定检测到第二频带的第三OFDM符号序列时，处理模块还可用于从N个OFDM符号中确定该第n个OFDM符号，该N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送该第n个OFDM符号的截止点不与该第三OFDM符号序列在时域重叠，N为正整数，n小于N。以及，处理模块可生成上述指示信息，指示信息可用于确定n的取值。
在另一种具体的示例中，当处理模块确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列时，该通信模块具体可用于在发送该第一OFDM符号序列的前导符号的截止点，发送该第二OFDM符号序列中的第一个OFDM符号。
在通过硬件组件实现第三方面所示通信装置时，该通信装置可包括处理器，用于执行上述第一方面和/或第一方面的任意可能的设计中提供的功能或步骤或操作。该通信装置还可以包括存储器。其中，存储器可用于存储指令，处理器可用于从所述存储器中调用并运行所述指令，以执行上述第一方面和/或第一方面的任意可能的设计中提供的功能或步骤或操作。该通信装置还可包括通信接口，用于通信装置通过电力线等有线方式进行通信。
示例性的，处理器可用于将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。通信接口可用于发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
在一种具体的示例中，当该处理器还可确定检测到第二频带的第三OFDM符号序列时，处理器还可用于从N个OFDM符号中确定该第n个OFDM符号，该N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送该第n个OFDM符号的截止点不与该第三OFDM符号序列在时域重叠，N为正整数，n小于N。以及，处理器可生成上述指示信息，指示信息可用于确定n的取值。
在另一种具体的示例中，当处理器确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列时，该通信接口具体可用于在发送该第一OFDM符号序列的前导符号的截止点，发送该第二OFDM符号序列中的第一个OFDM符号。
第四方面，本申请提供一种通信装置，该通信装置可以是接收端通信设备或接收端通信设备中的芯片。该通信装置可用于执行上述第二方面或第二方面的任一可能的设计中提供的功能或步骤或操作。该通信装置可通过硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各方法中的各功能或步骤或操作。比如，在通信装置中可以设置与上述各方法中的功能或步骤或操作相对应的功能模块来支持该通信装置执行上述方法。
在通过软件模块实现第四方面所示通信装置时，该通信装置可包括相互耦合的通信模块以及处理模块，其中，通信模块可用于支持通信装置进行通信，处理模块可用于通信装置执 行处理操作，如生成需要通过通信模块发送的信息/消息，或对通信模块接收的信号进行处理以得到信息/消息。
示例性的，该通信模块可用于接收通过第一频带(如电力线通信中的通带)传输的第一OFDM符号序列。处理模块可根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。其中，该第一OFDM符号序列承载于该第一频带，该第一OFDM符号序列包含多个OFDM符号，该第一OFDM符号序列是根据第一信号帧调制得到的，该第一信号帧包含前导序列，该第一信号帧是从该第一频带上通过第一采样率获得的信号转化来的。以及，该通信模块还可用于在接收第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中可包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号。和/或，该指示信息可用于确定该n的取值。
在一种具体的示例中，该指示信息用于确定n的取值，当该处理模块检测到承载于第二频带的第三OFDM符号序列时，该处理模块可根据该指示信息确定该第n个OFDM符号，从而通信模块可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
在另一种具体的示例中，若该处理模块确定在接收到第一OFDM符号序列之前，未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，则该通信模块可在接收第一OFDM符号序列前导符号的截止点，接收该第二OFDM符号序列中的第一个OFDM符号。
在通过硬件组件实现第四方面所示通信装置时，该通信装置可包括处理器，用于执行上述第二方面和/或第二方面的任意可能的设计中提供的功能或步骤或操作。该通信装置还可以包括存储器。其中，存储器可用于存储指令，处理器可用于从所述存储器中调用并运行所述指令，以执行上述第二方面和/或第二方面的任意可能的设计中提供的功能或步骤或操作。该通信装置还可包括通信接口，用于通信装置通过电力线等有线方式进行通信。
示例性的，该通信接口可用于接收通过第一频带(如电力线通信中的通带)传输的第一OFDM符号序列。处理器可根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。其中，该第一OFDM符号序列承载于该第一频带，该第一OFDM符号序列包含多个OFDM符号，该第一OFDM符号序列是根据第一信号帧调制得到的，该第一信号帧包含前导序列，该第一信号帧是从该第一频带上通过第一采样率获得的信号转化来的。以及，该通信接口还可用于在接收第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中可包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号。和/或，该指示信息可用于确定该n的取值。
在一种具体的示例中，该指示信息用于确定n的取值，当该处理器检测到承载于第二频带的第三OFDM符号序列时，该处理器可根据该指示信息确定该第n个OFDM符号，从而通信接口可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
在另一种具体的示例中，若该处理器确定在接收到第一OFDM符号序列之前，未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，则该通信接口可在接收第一OFDM符号序列前导符号的截止点，接收该第二OFDM符号序列中的第一个OFDM符号。
第五方面，本申请提供一种通信系统，该通信系统可以包括第三方面所示的通信装置以及第四方面所示的通信装置。其中，第三方面所示的通信装置可由软件模块和/或硬件组件构成，第四方面所示的通信装置可由软件模块和/或硬件组件构成。
示例性的，以第三方面所示的通信装置为发送端，第四方面所示的通信装置为接收端为例，本申请提供一种通信系统中，发送端可将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。当发送第一OFDM符号序列以及第二OFDM符号序列时，发送端可首先发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。相应地，接收端可接收通过第一频带传输的第一OFDM符号序列，并根据第一OFDM符号序列中的前导符号进行该第一信号帧的同步。以及，接收端可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。
第六方面，本申请提供一种计算机可读存储介质，所述计算机可读存储介质中存储有指令(或称程序)，当其在计算机上被调用执行时，使得计算机执行上述第一方面或第一方面的任意一种可能的设计，或上述第二方面或第二方面的任意一种可能的设计中所述的方法。
当执行上述第一方面或第一方面的任意一种可能的设计时，当其在计算机上被调用执行时，计算机可将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。以及，计算机可通过通信接口，在第一频带发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。
当执行上述第二方面或第二方面的任意一种可能的设计时，当其在计算机上被调用执行 时，计算机可控制通信接口接收第一频带(如电力线通信中的通带)传输的第一OFDM符号序列，并根据第一OFDM符号序列中的前导符号进行该第一信号帧的同步，以及，控制通信接口在接收该第一OFDM符号序列的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
第七方面，本申请提供一种计算机程序产品，该计算机程序产品可包含指令，当所述计算机程序产品在计算机上运行时使得计算机执行上述第一方面或第一方面的任意一种可能的设计，或上述第二方面或第二方面的任意一种可能的设计中所述的方法。
第八方面，本申请提供一种芯片和/或包含芯片的芯片系统，该芯片可包括处理器。该芯片还可以包括存储器(或存储模块)和/或通信接口(或通信模块)。该芯片可用于执行上述第一方面或第一方面的任意一种可能的设计，或上述第二方面或第二方面的任意一种可能的设计中所述的方法。该芯片系统可以由上述芯片构成，也可以包含上述芯片和其他分立器件，如存储器(或存储模块)、通信接口和/或通信接口(或通信模块)。
上述第二方面至第八方面及其可能的设计中的有益效果可以参考对第一方面及第一方面的可能的设计中所述方法的有益效果的描述。
附图说明
图1为本申请实施例提供的一种通信系统的架构示意图；
图2为本申请实施例提供的一种信号帧对应的OFDM符号序列的结构流程示意图；
图3为本申请实施例提供的一种通信方法的流程示意图；
图4为本申请实施例提供的另一种信号帧对应的OFDM符号序列的结构流程示意图；
图5为本申请实施例提供的一种信号帧的帧头结构示意图；
图6为本申请实施例提供的一种信号帧发送时序示意图；
图7为本申请实施例提供的一种通信方法的流程示意图；
图8为本申请实施例提供的另一种信号帧发送时序示意图；
图9为本申请实施例提供的另一种通信方法的流程示意图；
图10为本申请实施例提供的一种通信装置的结构示意图；
图11为本申请实施例提供的另一种通信装置的结构示意图；
图12为本申请实施例提供的另一种通信装置的结构示意图；
图13为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
本申请实施例提供的通信方法，可以用于电力线通信系统(power line communication，PLC)或宽带电力线(broadband over power line，BPL)通信系统等有线或无线通信系统中，用于提高这些通信系统同时通过第一频带和第二频带进行信号帧的传输时，第二频带信号的开销较大的问题。
一种示例性的PLC通信系统可具有图1所示架构。如图1所示，电力线通信系统可包括 电力线、网关设备、多个电力线通信设备以及终端等用网设备。其中，电力线用于传输电源信号，电压信号可用于驱动电器。网关设备与互联网连接，用于提供互联网的接入。电力线通信设备可包括网关侧电力线通信设备(例如图1所示的第一电力线通信设备)，网关侧电力线通信设备与网关设备连接。电力线通信设备还可包括用于向终端等用网设备提供网络信号的终端侧电力线通信设备(例如图1所示的第二电力线通信设备)。
在从互联网向终端发送数据时，第一电力线通信设备可接收自于网关设备的从互联网向终端发送的数据。第一电力线通信设备还可将来自网关的数据调制到PLC信号上并耦合到电力线，从而可利用电力线转发数据。第二电力线通信设备可用于将电力线传输的PLC信号进行解调以获得数据，并将解调后获得的数据通过无线等方式转发给终端，从而令终端等用网设备接收到来自互联网侧的数据。同理，图1所示系统也可以实现由终端向互联网侧的数据传输。
以上电力线通信设备具体可以是电力猫或其他类型的电力线通信调制解调器，本申请不予具体限定。
目前在如图1所示第一电力线通信设备和/或第二电力线通信设备进行数据发送时，由第一电力线通信设备和/或第二电力线通信设备将待发送的数据包承载于信号帧，并将信号调制为OFDM符号序列，进一步通过第一频带信号和/或第二频带信号发送该OFDM符号序列。相应地，接收端电力线通信设备在接收电力线中通过第一频带信号和/或第二频带信号传输的OFDM符号序列后，经过解调可获得信号帧，进一步可根据信号帧解析出数据包。
如图2所示，在一种可能的示例中，信号帧转换到时域所获得的OFDM符号序列可包括前导符号、帧头符号、以及数据载体符号。
其中，前导符号由信号帧的前导序列(preamble)转换得到，可用于进行同步。此外，前导符号还可以用于初始信道估计(initial channel estimation)以及用于自动增益控制(automatic gain control，AGC)等。
帧头符号可由信号帧的帧头(header)转换得到。帧头符号可包括物理(physical，PHY)层的一些参数信息，例如发送端电力线通信设备的标识(identification，ID)(又可以称之为源端标识(source identification，SID))、接收端电力线通信设备的ID(又可称之为目的端标识(destination identification，DID))等。例如，帧头符号可以是由至少一个连续的OFDM符号组成的。
数据载体符号，可用于承载信号帧的负载(payload)，负载中可携带数据信息，如数据包。
在一些实施例中，信号帧对应的OFDM符号序列还可以包括额外信道估计(additional channel estimation，ACE)符号，额外信道估计符号由信号帧的额外信道估计信息转换得到。具体的，额外信道估计符号可位于帧头符号和数据载体符号之间，可承载于至少一个OFDM符号上，本申请对此不作限定。额外信道估计符号可用于提取数据载体符号所承载的数据信息。
基于本申请实施例提供的通信方法，在同时进行第一频带信号帧和第二频带信号帧的传输时，可通过第一频带信号帧的前导符号对第二频带信号帧进行同步，因此第二频带信号帧的OFDM符号序列可不包含前导符号，以降低第二频带通信的开销。
本申请实施例提供的通信方法可由发送端电力线通信设备(或称发送端)以及接收端电力向通信设备(或称接收端)执行。如图3所示，该方法具体可包括以下步骤：
S101：发送端将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，该第一信号帧和该第二信号帧分别包含前导序列，该第一OFDM符号序列包含多个OFDM符号，该第二OFDM符号序列包含至少一个OFDM符号；该第一信号帧是从第一频带上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，上述第一信号帧和上述第二信号帧是数据信号，是器件中对模拟信号进行采样，然后转化而成的。其中，第一信号帧以上述第一采样率采样得到，和第二信号帧以上述第二采样率采样得到。采样率用于表示每秒能采样多少兆个样本，单位可以是兆样本数量/秒(MSa/s)。若第一频带为电力线通信中的通带，则第一采样率为200MSa/s。若第二频带为电力线通信中的基带，则第二采样率为800MSa/s。
在将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列时，发送端可先识别出信号帧中的前导序列，将其丢弃，并对第二信号帧中的其他部分进行调制。或者，发送端可识别第二信号帧中的除前导序列外的其他部分，对这些部分进行调制(或者说，忽略对于第二信号帧中的前导序列进行调制)。
S102：发送端发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号。或者说，第一OFDM符号序列中的第n个OFDM符号的截止点，与第二OFDM符号序列中的第一个OFDM符号的起始点对齐(对齐是指时间一致)。或者再换句话说，发送端从第一OFDM符号序列中的第n个OFDM符号的截止点开始，发送第二OFDM符号序列。应理解，本申请中，发送第n个OFDM符号的截止点是指发送端发送第n个OFDM符号的截止时刻；发送第一个OFDM符号的起始点是指发送端开始发送第一个OFDM符号的时刻。
其中，该第一OFDM符号序列承载于所述第一频带(或者说，第一OFDM符号序列通过第一频带发送)，该第二OFDM符号序列承载于所述第二频带(或者说，第二OFDM符号序列通过第二频带发送)。
相应地，接收端接收第一OFDM符号序列。
S103：接收端根据第一OFDM符号序列包含的前导符号进行第一信号帧的同步。
S104：接收端从第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号。或者换句话说，接收端从第一OFDM符号序列中的第n个OFDM符号的截止点开始，接收第二OFDM符号序列。应理解，本申请中，接收第n个OFDM符号的截止点是指接收端接收第n个OFDM符号的截止时刻；接收第一个OFDM符号的起始点是指接收端开始接收第一个OFDM符号的时刻。
其中，该第二OFDM符号序列不包括前导符号，该第一信号帧承载于第一频带，该第二信号帧承载于第二频带，n为正整数。
采用以上方式，发送端发送第一OFDM符号序列的第n个OFDM符号的截止点，和发送端发送第二OFDM符号序列的第一个OFDM符号的起始点是对齐的。当接收端根据第一OFDM符号序列的前导符号对第一信号帧进行同步，并从接收该第n个OFDM符号的截止点开始接收第二信号帧时，能够实现第二信号帧的时域同步，因此可在第二OFDM符号序列中省略前导符号，以降低第二频带的传输开销。另外，由于接收端不需要对第二信号帧进行同步，因此节省了 对第二信号帧进行同步产生的时延，提高了通信速率。
示例性的，以上第一频带可以是电力线通信中的通带。第二频带可以是电力线通信中的基带。
如图4所示，第二OFDM符号序列可包括帧头符号以及数据载体符号。由于不包含前导符号，当承载相同的数据时，第二OFDM符号序列的长度小于包含前导符号的信号帧对应的OFDM符号序列的长度。
在一种可能的示例中，第二信号帧的帧头中可包括导频信号(pilot tone)，其中，导频信号可用于接收端提取帧头携带的管理信息。该管理信息可用于接收第二OFDM符号序列中的数据载体符号，以及可在第二OFDM符号序列中包含额外信道估计符号时用于额外信道估计符号的接收。
具体的，如图5所示，导频信号可以以子载波为单位等间隔设置于第二信号帧的帧头。示例性的，每个导频信号可占用一个子载波，相邻两个导频信号之间的间隔可为k个子载波，其余未被导频信号占用的子载波可用于承载经过前向纠错码(forward error correction，FEC)编码和重复(repetition)的帧头信息，帧头信息例如管理信息，k为正整数。例如，k＝7。
在本申请的实施中，还可由发送端向接收端指示在发送第一OFDM符号序列中的第n个OFDM符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。
在第一种可能的示例中，第一信号帧中可携带指示信息。指示信息可用于确定发送端从发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送该第二信号帧的第一个OFDM符号。或者换句话说，该指示信息可用于确定第一OFDM符号序列中的第n个OFDM符号的截止点与该第二OFDM符号序列中的第一个OFDM符号的起始点对齐。或者再换句话说，指示信息可用于确定发送端从发送第一OFDM符号序列中的第n个OFDM符号的截止点开始，发送该第二信号帧。因此，接收端可根据第一信号帧中的指示信息，从接收第一OFDM符号序列中的第n个OFDM符号的截止点开始接收第二OFDM符号序列中的第一个OFDM符号。
具体来说，指示信息可以通过第一信号帧中的特定比特位表示，例如，当第一信号帧中的特定比特为取值为0时，表示发送端未在发送第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号；当第一信号帧中的特定比特为取值为1时，表示发送端在发送第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号对齐。
例如，当n取固定值时，如1或其他值，若接收端解析到第一信号帧的帧头符号中携带指示信息，则接收端可确定从接收第一OFDM符号序列的第1个OFDM符号的截止点开始接收第二OFDM符号序列的第1个OFDM符号。此外，n的取值也可通过第一信号帧中的其他信息或第一信号帧以外的信息指示。
采用该示例，可由发送端通过指示信息指示接收端，从而令接收端确定是否在第二频带检测不包含前导符号的OFDM符号序列(即本申请提供的第二信号帧)，当第一信号帧不包括指示信息时，接收端即确定不需要在第二频带检测不包含前导符号的OFDM符号序列。此时接收端可检测第二频带中传输的携带前导符号的OFDM符号序列，或者说，接收端可根据第二频带传输的信号帧的前导符号对信号帧进行同步。
在第二种可能的示例中，指示信息还可用于确定n的取值，从而可令接收端确定发送端 在发送第一OFDM符号序列的哪个OFDM符号的截止点，发送第二OFDM符号序列的第一个OFDM符号，以提高传输可靠性。例如，指示信息可通过字段表示n的取值，如，字段“001”表示n＝1，字段“111”表示n＝7，等等。
上述示例中，当第一信号帧中未携带指示信息时，接收端可不从接收第一OFDM符号序列中的第n个OFDM符号的截止点接收第二OFDM符号序列中的第一个OFDM符号。例如，当确定未检测到第一信号帧中携带有指示信息时，接收端可按照现有方法检测第二频带中传输的携带有前导符号的OFDM符号序列(如现有技术或未来技术中承载于第二频带的携带有前导符号的OFDM符号序列)，并解调得到该OFDM符号序列对应的信号帧。
此外，上述指示信息还可包括：用于确定发送端在发送第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号的信息(具体设置方式可参照上述第一种可能的示例中对于指示信息的说明)，以及包括用于指示n的取值的信息(具体设置方式可参照上述第二种可能的示例中对于指示信息的说明)。
示例性的，上述指示信息可包含于第一信号帧的帧头中。此外，该指示信息还可以独立于第一信号帧单独发送，例如，发送端在发送第一OFDM符号序列之前，发送该指示信息对应的OFDM符号序列。
下面，结合图6以及图7，介绍本申请实施例提供的一种通信方法。该通信方法中，在发送第一OFDM符号序列之前，如图6所示，若发送端确定未检测到通信介质中正在传输承载于第一频带的OFDM符号序列(或者说，发送端未检测到通信介质有承载于第一频带的OFDM符号序列传输)，以及发送端确定未检测到正在传输的承载于第二频带的OFDM符号序列(或者说，发送端未检测到通信介质有承载于第二频带的OFDM符号序列传输)，则发送端可发送第一OFDM符号序列，并在发送第一OFDM符号序列中的前导符号(例如第一OFDM符号序列中的第一个OFDM符号)的截止点，发送第二OFDM符号序列中的第一个OFDM符号。应理解，当进行有线和/或无线通信时，发送端或接收端可检测当前的通信介质中是否有OFDM符号序列的传输。以PLC通信为例，通信介质可以是指电力线，发送端或接收端可探测电力线中是否传输有OFDM符号序列。另外，对于无线通信，通信介质可以是无线空口。
相应地，在接收端检测到通信介质中传输的第一OFDM符号序列之前，若接收端确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，则接收端可在接收第一OFDM符号序列中的前导符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
此外，第一信号帧的帧头符号可携带指示信息，用于确定发送端在发送第一OFDM符号序列中的前导符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。第一信号帧的帧头符号可承载该指示信息。相应地，当第一信号帧包括指示信息时，接收端也可根据指示信息获知，从接收第一OFDM符号序列中的前导符号的截止点接收第二OFDM符号序列中的第一个OFDM符号。此外，当第一信号帧不包括指示信息时，也可设置接收端按照现有技术检测该第二频带中传输的信号帧的OFDM符号序列。或者说，当第一信号帧不包括指示信息时，该第二频带传输的信号帧的OFDM符号序列包括前导符号，接收端可根据前导符号进行同步以及根据前导符号提取OFDM符号序列的帧头符号中的管理信息。
以如图1所示的电力线通信场景为例，当由第一电力线通信设备作为信号帧的发送端，且第二电力线通信设备为信号帧的接收端时，如图7所示，本申请实施例提供的通信方法可包括以下步骤：
S201：第一电力线通信设备确定未检测到电力线中传输有承载于通带的OFDM符号序列以及承载于基带的OFDM符号序列。
S202：第一电力线通信设备将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧除前导序列以外的部分调制为第二OFDM符号序列。从而第二OFDM符号序列不包含前导符号。
其中，第二信号帧的帧头中可包括导频信号，用于提取第二信号帧的帧头符号中的管理信息。上述第一信号帧是从通带上通过第一采样率获得的信号转化来的，第二信号帧是从基带上通过第二采样率获得的信号转化来的。
S203：第一电力线通信设备发送第一OFDM符号序列，以及在发送第一OFDM符号序列中的前导符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。
其中，第一信号帧的OFDM符号序列承载于通带，第二OFDM符号序列承载于基带。
S204：第二电力线通信设备接收第一OFDM符号序列，以及确定在检测到第一OFDM符号序列前，未检测到电力线中传输有承载于通带的信号帧的OFDM符号序列以及承载于基带的信号帧的OFDM符号序列。
S205：第二电力线通信设备根据第一OFDM符号序列的前导符号进行同步，并在接收第一OFDM符号序列中的前导符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号。
S206：第二电力线通信设备根据第一OFDM符号序列中的前导符号，提取第一信号帧的帧头符号中的管理信息，并根据管理信息包含的指示信息，确定发送端在发送第一OFDM符号序列中的前导符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。
其中，第二电力线通信设备可根据第一OFDM符号序列中的前导符号进行通带信道估计，得到通带信道均衡系数，根据该系数提取第一信号帧的帧头符号中的管理信息。
此外，第二电力线通信设备可根据第一信号帧的帧头符号中的管理信息获取第一信号帧的数据载体符号所承载的信息。
具体的，第二电力线通信设备可根据第一信号帧的帧头符号中的管理信息接收第一信号帧的额外信道估计符号以及数据载体符号，并根据额外信道估计符号进行信道估计，得到信道均衡系数，用于获取第一信号帧的数据载体符号承载的信息。
S207：第二电力线通信设备根据第二OFDM符号序列中的帧头符号(即第一个OFDM符号，因为第二OFDM符号序列不包含前导符号，因此第一个OFDM符号为帧头符号)获得第二信号帧的频域的帧头。
具体的，第二电力线通信设备可根据第二OFDM符号序列中，帧头符号的循环前序中的前1024个时域点进行信号的自动功率增益调整，并对第二信号帧的第一个OFDM符号进行傅里叶变换得到第二信号帧的帧头。
S208：第二电力线通信设备根据第二信号帧的帧头中的导频信号，提取出第二信号帧中的管理信息。
示例性的，第二电力线通信设备可提取第二信号帧的帧头中的导频信号，并插值进行信道估计，得到基带信道均衡系数，从而可以提取出第二信号帧中的管理信息。
S209：第二电力线通信设备根据第二信号帧的帧头中的管理信息获取第二信号帧的数据载体符号承载的信息。
具体的，第二电力线通信设备可根据管理信息接收第二信号帧的额外信道估计符号以及数据载体符号，并根据额外信道估计符号进行信道估计，得到信道均衡系数，用于获取数据 载体符号承载的数据信息。
下面，结合图8以及图9，介绍本申请实施例提供的另一种通信方法。该通信方法中，在发送第一OFDM符号序列之前，若发送端确定检测到通信介质中传输的承载于第二频带的OFDM符号序列(以下可称该OFDM符号序列为第三OFDM符号序列)，则如图8所示，发送端可在第一信号帧中携带指示信息。指示信息可用于确定发送端在发送第一OFDM符号序列中的第n个OFDM符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。第一信号帧的帧头符号可承载该指示信息。以及，发送端可发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号。其中，第n个OFDM符号的截止点不与第三OFDM符号序列存在时域的重合。发送端还可从第一OFDM符号序列包含的N个OFDM符号中，确定该第n个调制符号，n、N为正整数，且N≥n。
相应地，当接收端检测到承载于第一频带的第一OFDM符号序列时，若接收端确定通信介质中还传输有承载于第二频带的第三OFDM符号序列，则接收端可根据第一信号帧携带的指示信息，确定发送端在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号。从而接收端可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，开始接收第二OFDM符号序列中的第一个OFDM符号。
此外，当第一信号帧不包括指示信息时，也可设置接收端按照现有技术检测该第二频带中传输的信号帧的OFDM符号序列。或者说，当第一信号帧不包括指示信息时，该第二频带传输的信号帧的OFDM符号序列包括前导符号，接收端可根据前导符号进行同步以及根据前导符号提取帧头符号中的管理信息。
在该示例中，当判断当前有第二频带的OFDM符号序列的发送，发送端可根据资源调度情况确定是否根据第一信号帧的OFDM符号序列触发第二OFDM符号序列的发送(或者说，确定是否在发送第一信号帧的第n个OFDM符号的截止点发送第二信号帧的第一个OFDM符号)。比如，可供发送第二频带的OFDM符号序列的时域资源不足以发送第二OFDM符号序列，则发送端可确定不采用第一信号帧触发第二信号帧的发送。再比如，发送第一信号帧的全部N个OFDM符号的截止点都与第二频带承载的信号帧的OFDM符号序列(包括但不限于第三OFDM符号序列)存在时域重叠，此时发送第二信号帧可能造成信号冲突，则可确定不采用第一OFDM符号序列触发第二OFDM符号序列的发送。
如果发送端确定可以根据第一信号帧对应的第一OFDM符号序列触发第二OFDM符号序列的发送，则发送端可在第一信号帧中携带指示信息，从而令接收端根据指示信息确定在接收第一信号帧的第n个OFDM符号的截止点开始接收第二信号帧。否则，如果发送端确定不能根据第一信号帧的OFDM符号序列触发第二OFDM符号序列的发送，则发送端不在第一信号帧中携带指示信息，使得接收端确定不根据第一信号帧的第n个OFDM符号的截止点进行第二信号帧的接收，此时，发送端可通过该第二频带传输包含前导符号的OFDM符号序列，使得接收端检测并接收携带前导符号的OFDM符号序列。或者，如果发送端确定不能根据第一信号帧的OFDM符号序列触发第二OFDM符号序列的发送，则发送端可在第一信号帧中携带另一个指示信息，用于指示接收端不根据第一信号帧的第n个OFDM符号的截止点进行第二信号帧的接收。
以如图1所示的电力线通信场景为例，当由第一电力线通信设备作为信号帧的发送端，且第二电力线通信设备为信号帧的接收端时，如图9所示，本申请实施例提供的通信方法可包括以下步骤：
S301：第一电力线通信设备确定检测到承载于基带的第三OFDM符号序列。
S302：第一电力线通信设备从N个OFDM符号中确定第n个OFDM符号，并将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧除前导序列以外的部分调制为第二OFDM符号序列。从而第二OFDM符号序列不包含前导符号。
其中，N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送第n个OFDM符号的截止点不与第三OFDM符号序列在时域重叠。上述第一信号帧的帧头符号中包括指示信息，用于确定在发送第一OFDM符号序列中的前导符号的截止点发送第二OFDM符号序列中的第一个OFDM符号。
此外，上述第二信号帧的帧头中可包括导频信号，用于提取第二信号帧的帧头符号中的管理信息。上述第一信号帧是从通带上通过第一采样率获得的信号转化来的，第二信号帧是从基带上通过第二采样率获得的信号转化来的。
S303：第一电力线通信设备发送第一OFDM符号序列，以及在发送第一OFDM符号序列中的该第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号。
其中，第一信号帧的OFDM符号序列承载于通带，第二OFDM符号序列承载于基带。
S304：第二电力线通信设备接收第一OFDM符号序列，以及确定在接收第一OFDM符号序列之前，检测到承载于基带的第三OFDM符号序列。
S305：第二电力线通信设备根据第一OFDM符号序列中的前导符号进行同步。
S306：第二电力线通信设备根据第一OFDM符号序列中的前导符号，提取第一信号帧的帧头符号中的管理信息，并根据管理信息包含的指示信息确定发送端在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM。
其中，第二电力线通信设备可根据第一OFDM符号序列中的前导符号进行通带信道估计，得到通带信道均衡系数，根据该系数提取第一信号帧的帧头符号中的管理信息。
此外，第二电力线通信设备可根据第一信号帧的帧头符号中的管理信息获取第一信号帧的数据载体符号所承载的信息。
具体的，第二电力线通信设备可根据第一信号帧的帧头符号中的管理信息接收第一信号帧的额外信道估计符号以及数据载体符号，并根据额外信道估计符号进行信道估计，得到信道均衡系数，用于获取数据载体符号承载的信息。
S307：第二电力线通信设备在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号。
S308：第二电力线通信设备根据第二OFDM符号序列中的帧头符号获得第二信号帧的频域的帧头。
具体的，第二电力线通信设备可根据第二OFDM符号序列中，帧头符号(即第一个OFDM符号)的循环前序中的前1024个时域点进行信号的自动功率增益调整，并对第二信号帧的第一个OFDM符号进行傅里叶变换得到第二信号帧的帧头。
S309：第二电力线通信设备根据第二信号帧的帧头中的导频信号，提取出第二信号帧中的管理信息。
示例性的，第二电力线通信设备可提取第二信号帧的帧头中的导频信号，并插值进行信道估计，得到基带信道均衡系数，从而可以提取出第二信号帧中的管理信息。
S310：第二电力线通信设备根据第二信号帧的帧头中的管理信息获取第二信号帧的数据 载体符号承载的信息。
具体的，第二电力线通信设备可管理信息接收第二信号帧的额外信道估计符号以及数据载体符号，并根据额外信道估计符号进行信道估计，得到信道均衡系数，用于获取数据载体符号承载的信息。
上述本申请提供的实施例中，从发送端及接收端分别所实现的功能的角度对本申请实施例提供的通信方法及方法流程进行了介绍。为了实现上述本申请实施例提供的方法中的各功能，该发送端及接收端可以分别包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。发送端及接收端中，上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
如图10所示，本申请实施例提供的一种通信装置1000可以包括通信模块1001以及处理模块1002，以上通信模块1001以及处理模块1002之间相互耦合。该通信装置1000可用于执行以上方法实施例中由发送端执行的步骤。该通信模块1001可用于支持通信装置1000进行通信，通信模块1001可具备通信功能，例如能够通过电力线等有线和/或无线通信介质进行数据帧的接收和/或发送。处理模块1002可用于支持该通信装置1000执行上述方法实施例中发送端的处理动作，包括但不限于：生成由通信模块1001发送的信息、消息，和/或，对通信模块1001接收的信号进行解调解码、根据接收的数据帧确定通信参数等等。
在执行上述方法实施例中由电力线通信设备执行的步骤时，以上处理模块1002可用于将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。通信模块1001可用于发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
在一种具体的示例中，当该处理模块1002还可确定检测到第二频带的第三OFDM符号序列时，处理模块1002还可用于从N个OFDM符号中确定该第n个OFDM符号，该N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送该第n个OFDM符号的截止点不与该第三OFDM符号序列在时域重叠，N为正整数，n小于N。以及，处理模块1002可生成上述指示信息，指示信息可用于确定n的取值。
在另一种具体的示例中，当处理模块1002确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列时，该通信模块1001具体可用于在发送该第一OFDM符号序列的前导符号的截止点，发送该第二OFDM符号序列中的第一个OFDM符号。
当本申请提供的通信方法应用于电力线通信系统时，通信装置还可包括如图11所示结构，可见，通信装置1100可包括处理器1101、存储器1102以及通信接口1103。
以上处理器1101可用于对通信协议以及通信数据进行处理，以及对通信装置进行控制，执行软件程序，处理软件程序的数据等。存储器1102可用于存储指令(或称程序)和数据，处理器1101可基于该指令执行本申请实施例中由发送端执行的方法。通信接口1103在本申请中可用于通信装置1100进行有线通信，例如，接收通过电力线传输的信号，以及通过电力线发送信号。
示例性的，以上处理器1101可用于执行上述由处理模块1002所执行的步骤。通信接口1103可用于执行上述由通信模块1001执行的步骤。
具体的，处理器1101可用于将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列。其中，第一信号帧和第二信号帧分别包含前导序列，该第一OFDM符号序列可包含多个OFDM符号，该第二OFDM符号序列可包含至少一个OFDM符号。该第一信号帧是从第一频带(如电力线通信中的通带)上通过第一采样率获得的信号转化来的，该第二信号帧是从第二频带(如电力线通信中的基带)上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。通信接口1103可用于发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于该第一频带，该第二信号帧承载于该第二频带。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点，发送了该第二OFDM符号序列中的第一个OFDM符号。和/或，指示信息可用于确定n的取值。
在一种具体的示例中，当该处理器1101还可确定检测到第二频带的第三OFDM符号序列时，处理器1101还可用于从N个OFDM符号中确定该第n个OFDM符号，该N个OFDM符号为该第一OFDM符号序列包含的OFDM符号，发送该第n个OFDM符号的截止点不与该第三OFDM符号序列在时域重叠，N为正整数，n小于N。以及，处理器1101可生成上述指示信息，指示信息可用于确定n的取值。
在另一种具体的示例中，当处理器1101确定未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列时，该通信接口1103具体可用于在发送该第一OFDM符号序列的前导符号的截止点，发送该第二OFDM符号序列中的第一个OFDM符号。
应理解，以上通信装置也可由芯片构成。例如，该芯片包含处理器1101。另外，该芯片还可与存储器1102或者通信接口1103中的任意一个或多个组件耦合。
如图12所示，本申请实施例提供的另一种通信装置1200可以包括通信模块1201以及处理模块1202，以上通信模块1201以及处理模块1202之间相互耦合。该通信装置1200可用于执行以上方法实施例中由发送端执行的步骤。该通信模块1201可用于支持通信装置1200进行通信，通信模块1201可具备通信功能，例如能够通过电力线等有线和/或无线通信介质进行数据帧的接收和/或发送。处理模块1202可用于支持该通信装置1200执行上述方法实施例中发送端的处理动作，包括但不限于：生成由通信模块1201发送的信息、消息，和/或，对通信模块1201接收的信号进行解调解码、根据接收的数据帧确定通信参数等等。
在执行上述方法实施例中由电力线通信设备执行的步骤时，该通信模块1201可用于接收通过第一频带(如电力线通信中的通带)传输的第一OFDM符号序列。处理模块1202可根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。其中，该第一OFDM符号序列承载于该第一频带，该第一OFDM符号序列包含多个OFDM符号，该第一OFDM符号序列是根据第一信号帧调制得到的，该第一信号帧包含前导序列，该第一信号帧是从该第一频带上通过第一采样率获得的信号转化来的。以及，该通信模块1201还可用于在接收第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中可包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号。和/或，该指示信息可用于确定该n的取值。
在一种具体的示例中，该指示信息用于确定n的取值，当该处理模块1202检测到承载于第二频带的第三OFDM符号序列时，该处理模块1202可根据该指示信息确定该第n个OFDM符号，从而通信模块1201可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
在另一种具体的示例中，若该处理模块1202确定在接收到第一OFDM符号序列之前，未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，则该通信模块1201可在接收第一OFDM符号序列前导符号的截止点，接收该第二OFDM符号序列中的第一个OFDM符号。
当本申请提供的通信方法应用于电力线通信系统时，通信装置还可包括如图13所示结构。可见，通信装置1300可包括处理器1301、存储器1302、以及通信接口1303。
以上处理器1301可用于对通信协议以及通信数据进行处理，以及对通信装置进行控制，执行软件程序，处理软件程序的数据等。存储器1302可用于存储指令(或称程序)和数据，处理器1301可基于该指令执行本申请实施例中由接收端执行的方法。通信接口1303在本申请中可用于通信装置1300进行有线通信，例如，接收通过电力线传输的信号，以及通过电力线发送信号。
示例性的，以上处理器1301可用于执行上述由处理模块1202所执行的步骤。通信接口1303可用于执行上述由通信模块1201执行的步骤。
具体的，该通信接口1303可用于接收通过第一频带(如电力线通信中的通带)传输的第一OFDM符号序列。处理器1301可根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。其中，该第一OFDM符号序列承载于该第一频带，该第一OFDM符号序列包含多个OFDM符号，该第一OFDM符号序列是根据第一信号帧调制得到的，该第一信号帧包含前导序列，该第一信号帧是从该第一频带上通过第一采样率获得的信号转化来的。以及，该通信接口1303还可用于在接收第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带(如电力线通信中的基带)接收第二OFDM符号序列中的第一个OFDM符号，n为 正整数。其中，该第二OFDM符号序列包含至少一个OFDM符号，该第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，该第二信号帧包含前导序列，该第二信号帧是从该第二频带上通过第二采样率获得的信号转化来的，该第一采样率是该第二采样率的m倍，m为正整数且m大于等于2。
示例性的，该第二信号帧中包括导频信号。
示例性的，该第一信号帧的帧头中可包括指示信息。其中，该指示信息可用于确定发送端在发送该第一OFDM符号序列中的第n个OFDM符号的截止点发送该第二OFDM符号序列中的第一个OFDM符号。和/或，该指示信息可用于确定该n的取值。
在一种具体的示例中，该指示信息用于确定n的取值，当该处理器1301检测到承载于第二频带的第三OFDM符号序列时，该处理器1301可根据该指示信息确定该第n个OFDM符号，从而通信接口1303可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列的第一个OFDM符号。
在另一种具体的示例中，若该处理器1301确定在接收到第一OFDM符号序列之前，未检测到承载于第一频带的OFDM符号序列以及承载于第二频带的OFDM符号序列，则该通信接口1303可在接收第一OFDM符号序列前导符号的截止点，接收该第二OFDM符号序列中的第一个OFDM符号。
应理解，以上通信装置也可由芯片构成。例如，该芯片包含处理器1301。另外，该芯片还可与存储器1302或者通信接口1303中的任意一个或多个组件耦合。
基于与上述方法实施例相同构思，本申请实施例中还提供一种计算机可读存储介质，其上存储有计算机程序，该程序被处理器执行时，使该计算机执行上述方法实施例、方法实施例的任意一种可能的实现方式中由发送端和/或接收端执行的方法。
基于与上述方法实施例相同构思，本申请还提供一种计算机程序产品，该计算机程序产品在被计算机调用执行时，可以使得计算机实现上述方法实施例、方法实施例的任意一种可能的实现方式中由发送端和/或接收端执行的方法。
基于与上述方法实施例相同构思，本申请还提供一种芯片或芯片系统，该芯片可包括处理器。该芯片还可包括存储器(或存储模块)和/或通信接口(或通信模块)，或者，该芯片与存储器(或存储模块)和/或通信接口(或通信模块)耦合，其中，通信接口(或通信模块)可用于支持该芯片进行有线和/或无线通信，存储器(或存储模块)可用于存储程序，该处理器调用该程序可用于实现上述方法实施例、方法实施例的任意一种可能的实现方式中由发送端和/或接收端执行的方法。该芯片系统可包括以上芯片，也可以包含上述芯片和其他分立器件，如存储器(或存储模块)和/或通信接口(或通信模块)。
基于与上述方法实施例相同构思，本申请还提供一种通信系统，该通信系统可包括以上通信装置以及发射器。该通信系统可用于实现上述方法实施例、方法实施例的任意一种可能的实现方式中涉及的方法。示例性的，该通信系统可具有如图1所示结构。
发送端可用于将第一信号帧调制为包含前导符号的OFDM符号序列，以及可将第二信号帧调制为不包含前导符号的OFDM符号序列。在发送第一信号帧以及第二信号帧分别对应的OFDM符号序列时，发送端可首先发送第一OFDM符号序列，并在发送第一OFDM符号序列中的第n个OFDM符号的截止点，发送第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，该第一信号帧承载于第一频带(如电力线通信中的通带)，该第二信号帧承载于第二频带(如 电力线通信中的基带)。相应地，接收端可接收第一OFDM符号序列，并根据前导符号进行该第一信号帧的同步，该前导符号包含于第一OFDM符号序列中。以及，接收端可在接收第一OFDM符号序列中的第n个OFDM符号的截止点，接收第二OFDM符号序列中的第一个OFDM符号，n为正整数。其中，发送端可以是图1所述电力线通信系统中的第一电力线通信设备，接收端可以是图1所述电力线通信系统中的第二电力线通信设备。或者，发送端可以是图1所述电力线通信系统中的第二电力线通信设备，接收端可以是图1所述电力线通信系统中的第一电力线通信设备。
本申请实施例是参照实施例所涉及的方法、装置、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。

Claims (21)

  1. 一种通信方法，其特征在于，包括：
    发送端将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列；其中，所述第一信号帧和所述第二信号帧分别包含前导序列，所述第一OFDM符号序列包含多个OFDM符号，所述第二OFDM符号序列包含至少一个OFDM符号；所述第一信号帧是从第一频带上通过第一采样率获得的信号转化来的，所述第二信号帧是从第二频带上通过第二采样率获得的信号转化来的，所述第一采样率是所述第二采样率的m倍，m为正整数且m大于等于2；
    所述发送端发送所述第一OFDM符号序列，并在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号，n为正整数，其中，所述第一OFDM符号序列承载于所述第一频带，所述第二OFDM符号序列承载于所述第二频带。
  2. 如权利要求1所述的方法，其特征在于，所述第二信号帧中包括导频信号。
  3. 如权利要求1或2所述的方法，其特征在于，所述第一信号帧的帧头中包括指示信息；
    其中，所述指示信息用于确定发送端在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号；和/或，
    所述指示信息用于确定所述n的取值。
  4. 如权利要求3所述的方法，其特征在于，所述方法还包括：
    所述发送端确定检测到所述第二频带中传输的第三OFDM符号序列；
    所述发送端从N个OFDM符号中确定所述第n个OFDM符号，所述N个OFDM符号为所述第一OFDM符号序列包含的OFDM符号，发送所述第n个OFDM符号的截止点不与所述第三OFDM符号序列在时域重叠，N为正整数，n小于N；
    所述发送端生成所述指示信息，所述指示信息用于确定所述n的取值。
  5. 如权利要求1-3中任一所述的方法，其特征在于，所述方法还包括：
    所述发送端确定未检测到承载于所述第一频带的OFDM符号序列以及承载于所述第二频带的OFDM符号序列；
    所述发送端发送所述第一OFDM符号序列，并在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号，包括：
    所述发送端在发送所述第一OFDM符号序列中的前导符号的截止点，发送所述第二OFDM符号序列中的第一个OFDM符号。
  6. 如权利要求1-5中任一所述的方法，其特征在于，所述第一频带包括电力线通信的通带，所述第二频带包括电力线通信的基带。
  7. 一种通信方法，其特征在于，包括：
    接收端接收通过第一频带传输的第一OFDM符号序列，所述第一OFDM符号序列承载于所述第一频带，所述第一OFDM符号序列包含多个OFDM符号，所述第一OFDM符号序列是根据第一信号帧调制得到的，所述第一信号帧包含前导序列，所述第一信号帧是从所述第一频带上通过第一采样率获得的信号转化来的；
    所述接收端根据所述第一OFDM符号序列的前导符号进行所述第一信号帧的同步，所述前导符号包含于所述第一OFDM符号序列；
    所述接收端在接收所述第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带接收第二OFDM符号序列中的第一个OFDM符号，n为正整数；其中，所述第二OFDM符号序 列包含至少一个OFDM符号，所述第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，所述第二信号帧包含前导序列，所述第二信号帧是从所述第二频带上通过第二采样率获得的信号转化来的，所述第一采样率是所述第二采样率的m倍，m为正整数且m大于等于2。
  8. 如权利要求7所述的方法，其特征在于，所述第一信号帧的帧头中包括指示信息；
    其中，所述指示信息用于确定发送端在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号；和/或，
    所述指示信息用于确定所述n的取值。
  9. 如权利要求8所述的方法，其特征在于，所述指示信息用于确定所述n的取值，所述方法还包括：
    所述接收端确定检测到所述第二频带中传输的第三OFDM符号序列；
    所述接收端根据所述指示信息确定所述第n个OFDM符号。
  10. 如权利要求7或8所述的方法，其特征在于，所述方法还包括：
    所述接收端确定在接收到所述第一OFDM符号序列之前，未检测到承载于所述第一频带的OFDM符号序列以及承载于所述第二频带的OFDM符号序列；
    所述接收端在接收所述第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带接收第二OFDM符号序列中的第一个OFDM符号，包括：
    所述接收端在接收所述前导符号的截止点，接收所述第二OFDM符号序列中的第一个OFDM符号。
  11. 如权利要求7-10中任一所述的方法，其特征在于，所述第一频带包括电力线通信的通带，所述第二频带包括电力线通信的基带。
  12. 一种通信装置，其特征在于，包括处理模块以及通信模块；
    所述处理模块，用于将第一信号帧调制为第一OFDM符号序列，以及将第二信号帧中除前导序列以外的部分调制为第二OFDM符号序列；其中，所述第一信号帧和所述第二信号帧分别包含前导序列，所述第一OFDM符号序列包含多个OFDM符号，所述第二OFDM符号序列包含至少一个OFDM符号；所述第一信号帧是从第一频带上通过第一采样率获得的信号转化来的，所述第二信号帧是从第二频带上通过第二采样率获得的信号转化来的，所述第一采样率是所述第二采样率的m倍，m为正整数且m大于等于2；
    所述通信模块，用于发送所述第一OFDM符号序列，并在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号，n为正整数，其中，所述第一OFDM符号序列承载于所述第一频带，所述第二OFDM符号序列承载于所述第二频带。
  13. 如权利要求12所述的通信装置，其特征在于，所述第一信号帧的帧头中包括指示信息；
    其中，所述指示信息用于确定发送端在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号；和/或，
    所述指示信息用于确定所述n的取值。
  14. 如权利要求13所述的通信装置，其特征在于，所述处理模块还用于：
    确定检测到所述第二频带中传输的第三OFDM符号序列；
    从N个OFDM符号中确定所述第n个OFDM符号，所述N个OFDM符号为所述第一OFDM符号序列包含的OFDM符号，发送所述第n个OFDM符号的截止点不与所述第三OFDM符号序列在 时域重叠，N为正整数，n小于N；
    生成所述指示信息，所述指示信息用于确定所述n的取值。
  15. 如权利要求12-14中任一所述的通信装置，其特征在于，所述处理模块还用于：
    确定未检测到承载于所述第一频带的OFDM符号序列以及承载于所述第二频带的OFDM符号序列；
    所述通信模块具体用于：
    在发送所述第一OFDM符号序列中的前导符号的截止点，发送所述第二OFDM符号序列中的第一个OFDM符号。
  16. 如权利要求12-15中任一所述的通信装置，其特征在于，所述第一频带包括电力线通信的通带，所述第二频带包括电力线通信的基带。
  17. 一种通信装置，其特征在于，包括处理模块以及通信模块；
    所述通信模块，用于接收通过第一频带传输的第一OFDM符号序列，所述第一OFDM符号序列承载于所述第一频带，所述第一OFDM符号序列是根据第一信号帧调制得到的，所述第一信号帧包含前导序列，所述第一信号帧是从所述第一频带上通过第一采样率获得的信号转化来的；
    所述处理模块，用于根据所述第一OFDM符号序列的前导符号进行所述第一信号帧的同步，所述前导符号包含于所述第一OFDM符号序列；
    所述通信模块，还用于在接收所述第一OFDM符号序列中的第n个OFDM符号的截止点，通过第二频带接收第二OFDM符号序列中的第一个OFDM符号，n为正整数；其中，所述第二OFDM符号序列是根据第二信号帧中除前导序列以外的部分调制得到的，所述第二信号帧包含前导序列，所述第二信号帧是从所述第二频带上通过第二采样率获得的信号转化来的，所述第一采样率是所述第二采样率的m倍，m为正整数且m大于等于2。
  18. 如权利要求17所述的通信装置，其特征在于，所述第一信号帧的帧头中包括指示信息；
    其中，所述指示信息用于确定发送端在发送所述第一OFDM符号序列中的第n个OFDM符号的截止点发送所述第二OFDM符号序列中的第一个OFDM符号；和/或，
    所述指示信息用于确定所述n的取值。
  19. 如权利要求18所述的通信装置，其特征在于，所述指示信息用于确定所述n的取值，所述处理模块还用于：
    确定检测到所述第二频带中传输的第三OFDM符号序列：
    根据所述指示信息确定所述第n个OFDM符号。
  20. 如权利要求17或18所述的通信装置，其特征在于，所述处理模块还用于：
    确定在接收到所述第一OFDM符号序列之前，未检测到承载于所述第一频带的OFDM符号序列以及承载于所述第二频带的OFDM符号序列；
    所述通信模块具体用于：
    在接收所述前导符号的截止点，接收所述第二OFDM符号序列中的第一个OFDM符号。
  21. 如权利要求17-20中任一所述的通信装置，其特征在于，所述第一频带包括电力线通信的通带，所述第二频带包括电力线通信的基带。
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