WO2017035808A1 - 一种信号发送或接收方法和设备 - Google Patents

一种信号发送或接收方法和设备 Download PDF

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Publication number
WO2017035808A1
WO2017035808A1 PCT/CN2015/088850 CN2015088850W WO2017035808A1 WO 2017035808 A1 WO2017035808 A1 WO 2017035808A1 CN 2015088850 W CN2015088850 W CN 2015088850W WO 2017035808 A1 WO2017035808 A1 WO 2017035808A1
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WIPO (PCT)
Prior art keywords
sequence
time domain
subcarriers
domain sequence
signal
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PCT/CN2015/088850
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English (en)
French (fr)
Inventor
曲秉玉
刘建琴
刘鹍鹏
周永行
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to JP2018511481A priority Critical patent/JP6462952B2/ja
Priority to CN201580082685.1A priority patent/CN107949991B/zh
Priority to PCT/CN2015/088850 priority patent/WO2017035808A1/zh
Priority to EP15902615.2A priority patent/EP3334058B1/en
Publication of WO2017035808A1 publication Critical patent/WO2017035808A1/zh
Priority to US15/909,732 priority patent/US10312990B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/12—Frequency diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0684—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission using different training sequences per antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2621—Reduction thereof using phase offsets between subcarriers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/3405—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power
    • H04L27/3411—Modifications of the signal space to increase the efficiency of transmission, e.g. reduction of the bit error rate, bandwidth, or average power reducing the peak to average power ratio or the mean power of the constellation; Arrangements for increasing the shape gain of a signal set
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
    • H04L27/2636—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals

Definitions

  • the present invention relates to the field of communication systems, and in particular, to a signal transmission or reception method and apparatus.
  • Modern communication systems such as Global System for Mobile Communications (GSM) systems, Code Division Multiple Access 2000 (CDMA2000), Wideband Code Division Multiple Access (WCDMA)
  • GSM Global System for Mobile Communications
  • CDMA2000 Code Division Multiple Access 2000
  • WCDMA Wideband Code Division Multiple Access
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • the carrier frequency is in the range of 3 GHz to 200 GHz, and the potential available bandwidth is about 250 GHz. Therefore, in the future communication system, it is necessary to consider an efficient signal transmission method, such as a low peak-to-average ratio transmission method, to reduce the requirements on the transmitting device.
  • the downlink signal transmission in the current LTE system usually adopts Orthogonal Frequency Division Multiplexing (OFDM) technology.
  • OFDM technology has strong anti-multipath interference capability, simple implementation of discrete Fourier transform, and favorable multi-antenna transmission technology, which has been widely studied and applied.
  • the uplink signal transmission adopts a Discrete Fourier Transform-Spread-OFDM (DFT-S-OFDM) scheme.
  • DFT-expanded OFDM has peak-to-average ratio performance similar to that of a single carrier signal.
  • orthogonal frequency division multiplexing can be implemented, thereby obtaining a single carrier orthogonal frequency division multiplexing scheme.
  • the Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission based on DFT-S-OFDM defined in current LTE means that the time domain signal envelope before DFT conversion conforms to the single carrier characteristic. Or there is a better peak-to-average ratio characteristic (or a better cubic metric (CM) characteristic), so that a lower peak-to-average ratio of the transmitted signal can be obtained.
  • CM cubic metric
  • the frequency domain it can be implemented in two ways: centralized or distributed.
  • a transmission signal of one UE occupies a continuous spectrum in the frequency domain (ie, the frequency domain subcarrier is Continuous) is part of the overall system bandwidth.
  • a transmission signal of one UE occupies discontinuous equally spaced multiple subcarriers in the frequency domain.
  • Two channels of one user equipment or two channels of two user equipments may be frequency division multiplexed, thereby ensuring little interference between the two channels.
  • an uplink control channel and an uplink reference signal of each terminal device (such as a Demodulation Reference Signal (Demodulation Reference Signal, DMRS)) transmission by time division multiplexing, or each user's uplink data channel and uplink reference signal are transmitted by time division multiplexing, that is, transmitting on different time domain symbols to maintain signal transmission with single carrier Approximation of low peak-to-average ratio performance.
  • DMRS Demodulation Reference Signal
  • the prior art does not have a terminal device that simultaneously transmits two kinds of signals whose frequency division is orthogonal in one time domain symbol, and can reduce the peak-to-average ratio due to the superposition of two signals.
  • Embodiments of the present invention provide a signal transmitting or receiving method and apparatus to solve how to simultaneously transmit two signals with orthogonal frequency division on the same time domain symbol, and can reduce peaks caused by superposition of two signals. Than the question.
  • an embodiment of the present invention provides a signaling method, including:
  • the transmitting device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, where the first sequence is One of a third sequence and a fourth sequence, the second sequence being the other of the third sequence and the fourth sequence, the 2M subcarriers being subcarriers on the same time domain symbol, the
  • the fourth sequence is a sequence carrying M first information elements, and the elements of the second time domain sequence corresponding to the fourth sequence and the first time domain sequence corresponding to the third sequence at the same time meet the following one complex number
  • One of the first time domain sequence and the second time domain sequence outside the factor is an in-phase branch and the other is an orthogonal branch;
  • the transmitting device transmits the transmission signal.
  • the first sequence is the third sequence, and the second sequence is the fourth sequence;
  • mapping the second sequence to the M odd-numbered subcarriers of the 2M subcarriers include:
  • the transmitting device performs a first joint transformation on the second time domain sequence to obtain the second sequence, wherein the first joint transform is a combination of a first phase rotation and an M ⁇ M discrete Fourier transform DFT Transform.
  • the first time domain sequence is a sequence obtained by using the inverse discrete Fourier transform IDFT of the first sequence
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the first time domain sequence is the second a sequence obtained by a second joint transformation of the sequence, the second joint transformation being a joint transformation of an inverse discrete Fourier transform IDFT of M ⁇ M and a second phase rotation
  • Mapping the first sequence to the M even-numbered subcarriers of the 2M subcarriers including: the sending device performing DFT on the second time domain sequence to obtain the fourth sequence, and Four sequences are mapped onto the M even numbered subcarriers.
  • the sending device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and the second sequence Before mapping to the M odd-numbered subcarriers of the 2M subcarriers, the method further includes:
  • the second time domain sequence has a length of M
  • the fourth sequence is a DM obtained by performing a 2M ⁇ 2M DFT on the extended sequence of the second time domain sequence.
  • the M numbers in the sequence are odd-numbered elements
  • the length of the extended sequence of the second time-domain sequence is 2M
  • the last M elements of the extended sequence of the second time-domain sequence are respectively the second time domain M elements of the sequence The opposite number;
  • the length of the first time domain sequence is M
  • the third sequence is an M number even-numbered element in a sequence obtained by performing DMT of 2M ⁇ 2M on the extended sequence of the first time domain sequence
  • the extended sequence of the first time domain sequence has a length of 2M
  • the last M elements of the extended sequence of the first time domain sequence are identical to the M elements of the second time domain sequence, respectively.
  • the sending device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and the second sequence Before mapping to the M odd-numbered subcarriers of the 2M subcarriers, the method further includes:
  • the transmitting device acquires the first time domain sequence x(k) and the second time domain sequence y(k);
  • the transmitting device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, including:
  • the third sequence is a sequence determined by the sending device.
  • the M first information elements are information elements carried by a control channel
  • the M first information elements are information elements carried by the data channel;
  • the M first information elements are system information elements carried by a broadcast channel.
  • the first time domain sequence is a pre-determined sequence of the transmitting end carrying M second The sequence of information elements obtained.
  • the predetermined sequence is a sequence or ZC obtained by cyclic expansion of a Zaffer's initial ZC sequence or a ZC sequence The sequence obtained by truncating the sequence or the sequence corresponding to the sequence used by the reference signal in the Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the sending signal includes a first signal and a second signal, where the M even numbers
  • the corresponding signal on the carrier is the first signal
  • the corresponding signal on the M odd-numbered subcarriers is the second signal
  • the first signal corresponds to a first power adjustment value
  • the second signal corresponds to a second power adjustment value
  • the 2M subcarriers may be all subcarriers on the entire bandwidth, or may be part of the entire bandwidth.
  • an embodiment of the present invention provides a signal receiving method, including:
  • the receiving device receives signals from 2M subcarriers, wherein the 2M subcarriers are subcarriers on the same time domain symbol;
  • the receiving device performs fast Fourier transform FFT on the signal to obtain the received first sequence and the second sequence, where the first sequence is carried on M even-numbered subcarriers in the 2M subcarriers
  • the second sequence is carried on M odd-numbered subcarriers of the 2M subcarriers
  • the first sequence is one of the third sequence and the fourth sequence
  • the second sequence is the Another of the third sequence and the fourth sequence, the fourth sequence being a sequence carrying M first information elements
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, where the first time domain sequence corresponding to the third sequence and the The second time domain sequence corresponding to the fourth sequence satisfies one element of the first time domain sequence and the second time domain sequence in the same time factor except for one complex factor, and the other is an orthogonal branch. road.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence
  • the receiving device performs a second joint transform on the received fourth sequence carried on the M odd-numbered subcarriers to obtain the received second time domain sequence, where the second joint transform is a joint transformation of an inverse discrete Fourier transform IDFT and a second phase rotation;
  • the receiving device demodulates and acquires the M first information elements from the received second time domain sequence.
  • the first time domain sequence is a sequence obtained by the first sequence by IDFT
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the first time domain sequence is the third a sequence obtained by a second joint transform
  • the second joint transform is a joint transformation of an M ⁇ M IDFT and a second phase rotation
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device demodulates and acquires the M first information elements from the received second time domain sequence.
  • the method further include:
  • the receiving device performs a second joint transformation on the received second sequence to obtain the first time domain sequence
  • the second joint transformation is a joint transformation of an M ⁇ M IDFT and a second phase rotation, the first
  • the receiving device performs signal processing on the received signals on the M subcarriers that are in the fourth sequence, and obtains the M first information elements, including:
  • the receiving device expands the received fourth sequence by inserting 0 to a length of 2M;
  • the M first information elements are obtained by demodulating the received second time domain sequence.
  • the receiving device performs a fast Fourier transform FFT on the signal to obtain the received first sequence and the second sequence.
  • the method further includes:
  • the receiving device expands the received third sequence by inserting 0 to a length of 2M;
  • the receiving device acquires M second information elements carried by the third sequence by demodulating the received first time domain sequence.
  • the receiving device performs fast Fourier transform FFT on the signal to obtain the received first sequence and After the second sequence, the method further includes:
  • the receiving device performs the channel estimation according to the received third sequence.
  • the third sequence is a sequence determined by the receiving device.
  • the predetermined sequence is a sequence obtained by cyclic expansion of a Zardorf initial ZC sequence or a ZC sequence, or a ZC sequence is truncated.
  • the sequence corresponds to the sequence corresponding to the sequence used by the reference signal in the Long Term Evolution LTE system.
  • the M first information elements are information elements carried by the control channel;
  • the M first information elements are information elements carried by the data channel;
  • the M first information elements are system information elements carried by a broadcast channel.
  • the 2M subcarriers may be all subcarriers on the entire bandwidth, or may be part of the entire bandwidth.
  • a signal sending device including: a processing module and a sending module;
  • the processing module is configured to map the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and map the second sequence to the M odd-numbered subcarriers of the 2M subcarriers, where the The first sequence is one of a third sequence and a fourth sequence, the second sequence is the other of the third sequence and the fourth sequence, and the 2M subcarriers are children on the same time domain symbol a carrier, the fourth sequence is a sequence carrying M first information elements, and the second time domain sequence corresponding to the fourth sequence and the first time domain sequence corresponding to the third sequence are at the same time The element satisfies one of the first time domain sequence and the second time domain sequence except the one complex factor, and the other is an orthogonal branch;
  • the processing module is further configured to: generate a transmission signal by transforming a sequence mapped on the 2M subcarriers into a time domain;
  • the sending module is configured to send the sending signal generated by the processing module.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence
  • the processing module is configured to perform a first joint transformation on the second time domain sequence to obtain the second sequence, before the second sequence is mapped to the M odd-numbered subcarriers of the 2M subcarriers, where
  • the first joint transform is a joint transform of a first phase rotation and a M ⁇ M discrete Fourier transform DFT.
  • the first time domain sequence is a sequence obtained by using the inverse discrete Fourier transform IDFT of the first sequence
  • the processing module is configured to perform a first joint transformation on the second time domain sequence to obtain the second sequence:
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the first time domain sequence is the second a sequence obtained by a second joint transformation of the sequence, the second joint transformation being a joint transformation of an inverse discrete Fourier transform IDFT of M ⁇ M and a second phase rotation
  • the processing module is configured to map the first sequence to M even-numbered subcarriers of the 2M subcarriers by performing DFT on the second time domain sequence to obtain the first sequence, and The first sequence is mapped onto the M even-numbered subcarriers.
  • the processing module maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and the second sequence Before mapping to M odd-numbered subcarriers in the 2M subcarriers, it is also used to:
  • first time domain sequence and the second time domain sequence Obtaining the first time domain sequence and the second time domain sequence; and performing a first joint transformation on the first time domain sequence to obtain the third sequence, wherein the first joint transform is a first phase Rotating a joint transform with a discrete Fourier transform DFT of M ⁇ M; and performing DFT on the second time domain sequence to obtain the fourth sequence;
  • the second time domain sequence has a length of M
  • the fourth sequence is a DM obtained by performing a 2M ⁇ 2M DFT on the extended sequence of the second time domain sequence.
  • M odd-numbered elements in the sequence the extended sequence of the second time-domain sequence has a length of 2M
  • the last M elements of the extended sequence of the second time-domain sequence are respectively the second time-domain sequence The opposite of the M elements;
  • the length of the first time domain sequence is M
  • the third sequence is an M even numbered element in a sequence obtained by performing DMT of 2M ⁇ 2M on the extended sequence of the first time domain sequence, where the The length of the extended sequence of the one-time domain sequence is 2M, and the last M elements of the extended sequence of the first time-domain sequence are respectively identical to the M elements of the second time-domain sequence.
  • the processing module maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and the second sequence Before being mapped to M odd-numbered subcarriers of the 2M subcarriers,
  • the processing module maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the second sequence to the M odd-numbered subcarriers of the 2M subcarriers as follows:
  • the third sequence is a predetermined sequence of the device.
  • the M first information elements are information elements carried by the control channel.
  • the M first information elements are information elements carried by the data channel;
  • the M first information elements are system information elements carried by a broadcast channel.
  • the first time domain sequence carries M second information by using a predetermined sequence of the device The sequence obtained by the element.
  • the predetermined sequence is a sequence or ZC obtained by cyclic expansion of a Zhafufu ZC sequence or a ZC sequence The sequence obtained by truncating the sequence or the sequence corresponding to the sequence used by the reference signal in the Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the sending signal includes a first signal and a second signal, where the M even numbers The corresponding signal on the carrier is the first signal, and the corresponding signal on the M odd-numbered subcarriers is the second signal;
  • the first signal corresponds to a first power adjustment value
  • the second signal Corresponding to the second power adjustment value
  • the 2M subcarriers may be all subcarriers on the entire bandwidth, or may be part of the entire bandwidth.
  • an embodiment of the present invention provides a signal receiving device, including: a receiving module and a processing module;
  • the receiving module is configured to receive signals from 2M subcarriers, where the 2M subcarriers are subcarriers on the same time domain symbol;
  • the processing module is configured to perform fast Fourier transform FFT on the signal received by the receiving module to obtain a received first sequence and a second sequence, where the first sequence is carried in the 2M subcarriers On the M even-numbered subcarriers, the second sequence is carried on M odd-numbered subcarriers in the 2M subcarriers, and the first sequence is one of the third sequence and the fourth sequence The second sequence is the other of the third sequence and the fourth sequence, the fourth sequence is a sequence carrying M first information elements;
  • the processing module is further configured to perform signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquire the M first information elements, where the first time domain corresponding to the third sequence And the element of the second time domain sequence corresponding to the fourth sequence at the same time satisfies that one of the first time domain sequence and the second time domain sequence is an in-phase branch except for one complex factor, and the other It is an orthogonal branch.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence
  • the processing module is configured to perform signal processing on the received signals on the M subcarriers carrying the fourth sequence to obtain the M first information elements:
  • the first time domain sequence is a sequence obtained by the first sequence by IDFT
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the first time domain sequence is the third a sequence obtained by a second joint transform
  • the second joint transform is a joint transformation of an M ⁇ M IDFT and a second phase rotation
  • the processing module performs signal processing on the received signals on the M subcarriers carrying the fourth sequence to obtain the M first information elements:
  • the processing module performs FFT on the signal to obtain the received first sequence and the second sequence, and is further used to:
  • the second joint transform is a joint transformation of an M ⁇ M IDFT and a second phase rotation
  • the receiving device performs signal processing on the received signals on the M subcarriers that are in the fourth sequence, and obtains the M first information elements, including:
  • the receiving device expands the received fourth sequence by inserting 0 to a length of 2M;
  • the M first information elements are obtained by demodulating the received second time domain sequence.
  • the processing module After the processing module performs a fast Fourier transform FFT on the signal to obtain the received first sequence and the second sequence, the processing module is further configured to:
  • the receiving device performs fast Fourier transform FFT on the signal to obtain the received first sequence
  • the device further includes:
  • the receiving device performs the channel estimation according to the received third sequence.
  • the third sequence is a predetermined sequence of the device.
  • the predetermined sequence is a sequence obtained by cyclic expansion of a Zhadol initial ZC sequence or a ZC sequence or a ZC sequence truncation The resulting sequence, or the sequence corresponding to the sequence used by the reference signal in the Long Term Evolution LTE system.
  • the M first information elements are information elements carried by the control channel;
  • the M first information elements are information elements carried by the data channel;
  • the M first information elements are system information elements carried by a broadcast channel.
  • the 2M subcarriers may be all subcarriers on the entire bandwidth, or may be part of the entire bandwidth. Subcarrier.
  • the time domain sequence corresponding to the two signals transmitted on the same time domain symbol satisfies the characteristics of the in-phase branch and the orthogonal branch transmission, that is, two transmitted on the same time domain symbol.
  • the element I/Q of the time domain sequence corresponding to the road signal is orthogonal, so when the two signals are simultaneously transmitted in the same time domain symbol (such as a symbol), the amplitude of the signal superimposed by the two signals can be maintained. Low peak-to-average ratio, and there is no possibility that the two signals may be in phase or inverted. Therefore, the signals superimposed on the two signals do not have a peak-to-average ratio due to the randomness of the phase, and the increase is The peak-to-average ratio is small.
  • the two signals are respectively transmitted on M even-numbered subcarriers and M odd-numbered subcarriers of 2M subcarriers, and the two signals satisfy frequency division orthogonal characteristics, and subcarriers of one signal There is no other signal on the other, and it is easy to distinguish two signals, so that the two signals have no interference or little interference when receiving.
  • FIG. 1 is a schematic diagram of frequency domain resource division according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a frame applied to an embodiment of the present invention.
  • FIG. 3 is a schematic flowchart diagram of a signal sending method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of transmission of frequency division multiplexing of information carried by a broadcast channel and data carried by a downlink data channel according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of frequency division multiplexing of a secondary synchronization signal according to an embodiment of the present invention
  • 6a and 6b are schematic views of a first example of an embodiment of the present invention.
  • FIG. 7a and 7b are schematic diagrams showing a second example of an embodiment of the present invention.
  • 8a, 8b, 8c and 8d are schematic views of a third example of an embodiment of the present invention.
  • FIG. 9 is a schematic flowchart diagram of a signal receiving method according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a signal sending apparatus according to an embodiment of the present invention.
  • FIG. 11 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention.
  • an uplink control channel and an uplink reference signal of a terminal device are usually transmitted in a time division manner.
  • the terminal device simultaneously transmits the uplink control information and the uplink reference signal in the same time domain symbol (such as a time domain SC-FDMA symbol)
  • one possible solution is to at least one of the time domain symbols to be transmitted.
  • the physical resource block is divided into two carrier groups that do not overlap each other, and the two carrier groups respectively send the uplink control information and the uplink reference signal. That is, at least one physical resource block to be transmitted is frequency-divided into two comb teeth, as shown in FIG. 1 , comb 1 (comb 1) is used to send uplink control information, Comb 2 is used to transmit the upstream reference signal.
  • At least one physical resource block of one time domain symbol is divided into two combs to simultaneously transmit the uplink control information and the uplink reference signal, that is, Two signals are sent, although the SC-FDMA signal on each comb can have better peak-to-average ratio characteristics in the time domain, but the two signals are transmitted on the same time domain symbol, possibly at some sampling points.
  • the upper two signals are close to the same phase, so that the transmitted signal becomes larger, and at other sampling points, the two signals are close to the inversion, so that the transmitted signal becomes smaller, thus resulting in a higher peak-to-average ratio.
  • the embodiment of the invention provides a signal sending method, which can simultaneously reduce the peak-to-average ratio caused by the superposition of two signals while transmitting two signals simultaneously on the same time domain symbol.
  • the time domain symbols are simply referred to as symbols.
  • the embodiments of the present invention can be applied to a communication system including a terminal device or a terminal device.
  • the terminal device may also be referred to as a terminal, a user equipment, a mobile station (MS), a mobile terminal, and the like.
  • the terminal device can communicate with one or more core networks via a radio access network (RAN), for example, the terminal device can be a mobile phone (or a cellular phone), a computer with a mobile terminal, etc.
  • RAN radio access network
  • the terminal device can be a mobile phone (or a cellular phone), a computer with a mobile terminal, etc.
  • it may be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges voice and/or data with a wireless access network.
  • the access network device may be a base station, an enhanced base station, or a relay having a scheduling function, or a device having a base station function.
  • the base station may be an evolved base station (evolved Node B, eNB or e-NodeB) in the LTE system, or may be a base station in other systems, which is not limited in the embodiment of the present invention.
  • eNB evolved Node B
  • e-NodeB evolved Node B
  • the following embodiments are described by taking a base station as an example, but the embodiment of the present invention is not limited to the base station.
  • the resource blocks of the transmitted signal include time domain resources and frequency domain resources.
  • time domain resources may include OFDM or SC-FDMA symbols
  • frequency domain resources may include subcarriers.
  • one resource block includes 14 OFDM symbols or SC-FDMA symbols (abbreviated as time domain symbols or symbols in the embodiment of the present invention) in the time domain, and includes 12 subcarriers in the frequency domain.
  • the time domain symbol in the embodiment of the present invention may be an OFDM or SC-FDMA symbol in an LTE system, but is not limited thereto, and may be, for example, an OFDM or SC-FDMA symbol in the time domain in other systems or other The unit of the form of the time domain.
  • the technical solution provided by the embodiments of the present invention is to achieve simultaneous transmission of two signals on the same time domain symbol, for example, transmitting two signals on one time domain symbol, and reducing two signals The superposition caused by the peak ratio.
  • the two signals mentioned in the embodiments of the present invention may be two different signals, or may be two parts of one signal, but the embodiments of the present invention are not limited to only two types of signals.
  • the time domain symbol in the embodiment of the present invention is a time domain unit of a resource for transmitting a signal, and may be an OFDM symbol, and may also be other time domain symbols.
  • the sending device is configured to send a signal
  • the receiving device is configured to receive a signal sent by the sending device.
  • the sending device may be a terminal device or an access network device. If the sending device is a terminal device, correspondingly, the receiving device may be an access network device. In this case, the signal is an uplink signal. If the transmitting device is an access network device, the receiving device may be a terminal device. In this case, the signal is a downlink signal.
  • the two signals in the embodiment of the present invention are not limited to the uplink control information and the uplink reference. signal.
  • the two signals may be an uplink reference signal and uplink control information, or data carried by the uplink reference signal and the uplink data channel, respectively, or two different uplink reference signals.
  • the two signals may be a downlink reference signal and downlink control information, or are physical broadcast channel information and primary synchronization channel information, or are physical broadcast channel information and secondary synchronization channel information, or are primary synchronization channel information.
  • secondary synchronization channel information or two parts of the primary synchronization channel information, or two parts of the secondary synchronization channel information, or two data channels carried by different terminal devices, two control channels of different terminal devices
  • the control information of the bearer, or the data carried by the data channel of different terminal devices and the control information carried by the control channel, are not enumerated in the embodiments of the present invention.
  • the method of the embodiment of the present invention can be applied to an existing frame structure system, and can also be applied to other frame structure systems, such as a frame structure of a high frequency transmission system, for example, can be applied to a frame structure system as shown in FIG. 2.
  • U denotes an uplink subframe
  • D denotes a downlink subframe
  • GP denotes a guard interval (Guard Period).
  • a frame structure of a special subframe as shown in FIG. 2 can be designed, and a time domain for transmitting uplink control information is reserved in the special subframe. Symbols and time domain symbols used to transmit downlink control information.
  • the last symbol of the special subframe is used as a reserved uplink symbol to transmit uplink control information, such as Acknowledge/Non-Acknowledge (ACK/NACK) information of the following data channel transmission.
  • ACK/NACK Acknowledge/Non-Acknowledge
  • FIG. 3 is a schematic flowchart diagram of a signal sending method according to an embodiment of the present invention. The method includes the following steps.
  • Step 301 The transmitting device maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the second sequence to the M odd-numbered subcarriers of the 2M subcarriers, where the first The sequence is one of a third sequence and a fourth sequence, the second sequence is the other of the third sequence and the fourth sequence, and the 2M subcarriers are subcarriers on the same time domain symbol,
  • the fourth sequence is a sequence carrying M first information elements, and the second time domain sequence corresponding to the fourth sequence and the first time domain sequence corresponding to the third sequence meet at the same time
  • one of the first time domain sequence and the second time domain sequence is an in-phase component (I-way), and the other is a quadrature component (Q-channel) ), or in the plural, then one is the real part, the other is the imaginary part, the same below, this article will not repeat them;
  • Step 302 The sending device generates a sending signal by transforming a sequence mapped on the 2M subcarriers into a time domain;
  • Step 303 The sending device sends the sending signal.
  • the method further includes:
  • Step 300 The sending device generates the second time domain sequence and the third sequence.
  • the sending device may directly generate the third sequence, or may be a first time domain sequence, and then generate the third sequence.
  • the transmitting device does not need to generate the first time domain sequence.
  • the I/Q orthogonality characteristic is satisfied, that is, the second time domain sequence and the first time domain.
  • the elements of the sequence at the same time satisfy the first time domain sequence and the elements in the second time domain sequence except the one complex factor, one of which is an in-phase branch and the other is an orthogonal branch.
  • the time domain sequence corresponding to the third sequence may be inversely discrete by the third sequence.
  • Inverse discrete Fouier transform (IDFT) is obtained.
  • the element at the same time in the second time domain sequence and the first time domain sequence satisfies the first time domain sequence and the second time domain sequence except for one complex factor (ie, extracting a complex common factor)
  • one complex factor ie, extracting a complex common factor
  • One of them is the in-phase branch and the other is the orthogonal branch. That is, the time domain sequence corresponding to the two signals satisfies the I/Q orthogonal characteristic.
  • the first time domain sequence and the second time domain sequence may be configured separately, or the second time domain sequence may be based on the third sequence configuration, or the second time domain sequence and the third
  • the sequences are constructed based on the same rules, for example based on an identical Zadoff-Chu (ZC) sequence construction.
  • ZC Zadoff-Chu
  • Embodiments of the present invention do not limit how to construct the second time domain sequence and the third sequence.
  • the sequence and the third sequence for carrying the M first information elements are sequences having approximately constant model properties or low peak-to-average ratios (or low three-dimensional metrics).
  • the sequence corresponds to the time domain sequence, and except for z(t), the first time domain signal and the second time domain signal satisfy one being a real number and one being an imaginary number.
  • the fourth sequence may be constructed based on a third sequence, and the fourth sequence carries the M first information elements.
  • a sequence for modulating the M first information elements may be constructed based on the third sequence.
  • the second time domain sequence is obtained based on the third sequence carrying M first information elements. For example, assume that the third sequence is a(0), a(1), ..., a(M-1), and the time domain sequence corresponding to the third sequence is x(0), x(1),.
  • the second time domain sequence obtained by carrying the M first information elements based on the third sequence may be: x(0) ⁇ (+j or -j) ⁇ Q, x (1) ⁇ (+j or -j) ⁇ Q, ..., x (M-1) ⁇ (+j or -j) ⁇ Q.
  • Q is a positive real number.
  • the information to be transmitted carried on the tth element of the second time domain sequence is +j or -j.
  • the third sequence When the first sequence is the third sequence, that is, the third sequence is mapped onto the even subcarriers, from the third sequence a(0), a(1), ..., a(M-1) to its corresponding
  • the transformation of the time domain sequence x(0), x(1), ..., x(M-1) may be IDFT.
  • the power adjustment can be changed to V*(a(0), a(1), ..., a(M-1)), and V is power adjustment.
  • Quantity is a positive real number.
  • the fourth sequence c(0), c(1), ..., c(M-1) can also be adjusted before being mapped to M subcarriers, that is, multiplied by a positive real constant U, which is U*( c(0), c(1), ..., c(M-1)), U is the power adjustment amount.
  • the sequence for carrying the M first information elements may be a sequence obtained using the same predefined rules as the third sequence.
  • sequence for carrying the M first information elements may also be independent of the time domain sequence corresponding to the third sequence. That is, the sequence for carrying the M first information elements may be a sequence obtained by a predetermined rule, instead of being constructed based on a time domain sequence corresponding to the third sequence.
  • the M information elements may be M information elements obtained after the original information elements are encoded or rate matched or repeated.
  • PAPR peak-to-average power ratio
  • the value of g(t) is +1 ⁇ P or ⁇ 1 ⁇ P, and P is a positive amplitude value (positive real number).
  • the value of g(t) is +1 ⁇ P or ⁇ 1 ⁇ P is determined according to the information element to be transmitted carried in the third sequence.
  • the value of h(t) is +1 ⁇ Q or -1 ⁇ Q, and Q is a positive amplitude value.
  • whether the value of h(t) is +1 ⁇ Q or ⁇ 1 ⁇ Q is determined according to the information element to be transmitted carried in the fourth sequence, that is, the M first information elements in the foregoing embodiment.
  • the sending device may configure different P and Q according to different channels, Thereby configuring different transmit powers of different channels.
  • the transmit power of the reference signal channel may be different from the transmit power of the data signal, and there may be a power offset.
  • the value of g(t) is +1 ⁇ P ⁇ j or ⁇ 1 ⁇ P ⁇ j, and P is a positive real number, wherein The value of g(t) is +1 ⁇ P ⁇ j or ⁇ 1 ⁇ P ⁇ j is determined according to the information element to be transmitted carried in the first time domain sequence.
  • the value of h(t) is +1 ⁇ Q ⁇ j or -1 ⁇ Q ⁇ j, and Q is a positive real number.
  • the value of h(t) is +1 ⁇ Q ⁇ j or 1 ⁇ Q ⁇ j is determined according to the information element to be transmitted carried in the second time domain sequence, that is, the M first information elements in the foregoing embodiment.
  • h(t) is +1 ⁇ Q ⁇ j; when the tth element of the M first information elements is ⁇ 1, h (t) is -1 x Q x j, or vice versa.
  • PAPR peak-to-average power ratio
  • g(t) is a binary phase shift key (BPSK), quadrature phase shift keying (QPSK) or any quadrature amplitude modulation (QAM) modulated signal.
  • BPSK binary phase shift key
  • QPSK quadrature phase shift keying
  • QAM quadrature amplitude modulation
  • the value of h(t) is +1 ⁇ Q or -1 ⁇ Q
  • Q is a positive amplitude value.
  • Q t represents an imaginary unit, and whether the value of h(t) is +1 ⁇ Q or ⁇ 1 ⁇ Q is determined according to the information element to be transmitted carried in the second time domain sequence.
  • g(t) can be QPSK or any QAM modulated signal
  • the transmission signal adopts a higher order modulation mode, and the number of information bits corresponding to each signal is increased, so that the implementation can transmit more
  • the information value also maintains a low peak-to-average ratio.
  • the two signals transmitted on the same time domain symbol maintain a low peak-to-average ratio
  • the two signals can be used as an equivalent transmission signal occupying 2M subcarriers (on these 2M subcarriers).
  • the signal is transformed by the 2M*2M IDFT to the signal in the time domain with good peak-to-average ratio characteristics).
  • the equivalent transmission signal is transmitted in a comb-like frequency division orthogonally with another 2M transmission signals.
  • the other transmission signal is a BPSK-based signal.
  • Each channel is an equally spaced subcarrier with an interval of 2 kHz.
  • the two signals comb-frequency division multiplexing occupy a total of 4M equally spaced subcarriers with an interval of k.
  • the time domain sequence corresponding to the two signals transmitted on the same time domain symbol satisfies the characteristics of the in-phase branch and the orthogonal branch transmission, that is, the time corresponding to the two signals transmitted on the same time domain symbol
  • the elements of the domain sequence are I/Q orthogonal, so when the two signals are simultaneously transmitted in the same time domain symbol (such as a symbol), since the amplitude of the signal superimposed by the two signals can maintain a low peak-to-average ratio, Therefore, the signal superimposed by the two signals does not have a peak-to-average ratio due to the randomness of the phase, and the increased peak-to-average ratio is small.
  • the two signals satisfy the characteristics of frequency division orthogonality, and there is no other signal on the subcarrier of one signal, and the two signals can be easily distinguished, so that the two signals do not interfere when receiving. Or the interference is small.
  • the 2M subcarriers may be 2M subcarriers equally spaced in the frequency domain, which may have a good peak-to-average ratio or a cubic metric characteristic.
  • the first subcarrier number is 0, and thus the numbers of 2M subcarriers are 0, 1, ..., 2M-1, respectively.
  • the M even-numbered subcarriers are subcarriers 0, 2, 4, ..., 2M-2, and the M odd-numbered subcarriers are subcarriers 1, 3, 5, ..., 2M-1.
  • the meanings of the M odd-numbered subcarriers and the M even-numbered subcarriers in all embodiments of the present invention are the same. The following texts are all described in this meaning.
  • the M odd number subcarriers in all embodiments of the present invention should be M even number subcarriers in this case
  • the M even-numbered subcarriers should be M odd-numbered subcarriers in this case. That is, the M even-numbered subcarriers in the embodiment of the present invention are the subcarriers 1, 3, 5, ..., 2M-1 in this case, and the M odd-numbered subcarriers in the embodiment of the present invention are Subcarriers 2, 4, 6, ..., 2M in this case.
  • the power adjustment may be separately performed before the third sequence and the fourth sequence are mapped to the subcarriers, that is, each element of the third sequence is multiplied by a positive real constant V, and each element of the fourth sequence is multiplied by a positive The real constant U, while the combined output of the last time domain signal maintains a good peak-to-average ratio characteristic.
  • M odd-numbered subcarriers and M even-numbered subcarriers can be regarded as two comb teeth, wherein M even-numbered subcarriers can be regarded as comb ones and M odd numbers.
  • the carrier can be seen as a comb.
  • the third sequence and the fourth sequence may be mapped to the comb teeth and the comb teeth respectively, or may be mapped to the comb teeth 2 and the comb teeth 1 respectively. Different embodiments are possible for different mapping methods.
  • the transmitting device maps the third sequence to the M even-numbered subcarriers, and maps the fourth sequence to the M odd-numbered subcarriers. That is, the first sequence and the third sequence are the same sequence, and are mapped to the M even-numbered subcarriers; the second sequence and the fourth sequence are the same sequence, and are mapped to the M odd-numbered subcarriers, where
  • the second time domain sequence corresponding to the second sequence ie, the fourth sequence
  • the embodiment further includes:
  • the transmitting device performs a first joint transformation on the second time domain sequence to obtain the second sequence, wherein the first joint transform is a combination of a first phase rotation and an M ⁇ M discrete Fourier transform DFT Transform.
  • the D ⁇ of the M ⁇ M in the embodiment of the present invention may be as follows: (It can also be a definition of other changes, such as Where M is an arbitrary positive integer, where ⁇ X(n) ⁇ is the transformed frequency domain sequence and n is the number of the frequency domain subcarrier.
  • the ID of the M ⁇ M in the embodiment of the present invention may be as follows: Where x(n) is the transformed time domain sequence, and n is the time value corresponding to the time domain sequence (may also be a definition of other changes, for example, And X(k) is the corresponding frequency domain sequence, and k is the frequency domain subcarrier number.
  • f(t) is a corresponding time domain sequence, for example, for the first time domain sequence, where f(t) is x(t) above, and for the second time domain sequence, where f( t) is y(t) in the following text.
  • the M ⁇ M DFT transform corresponds to mapping on all even-numbered subcarriers in 2M subcarriers, so the second time domain sequence needs to be used when mapping the transformed frequency domain sequence onto the odd numbered subcarriers.
  • the first phase rotation is performed to achieve an offset from the mapping frequency of the even-numbered subcarriers to the odd-numbered subcarrier mapping frequency.
  • first phase rotation and the M ⁇ M discrete Fourier transform DFT may be implemented simultaneously, or the first joint transform may be equivalent to first performing the first phase rotation on the second time domain sequence. Then, a D ⁇ of M ⁇ M is performed on the rotated second time domain sequence.
  • the transmitting device performs joint transformation on the second time domain sequence.
  • the step of obtaining the second sequence includes:
  • the transmitting device performs corresponding first phase rotation on the M elements of the second time domain sequence, and performs M ⁇ M DFT on the rotated second time domain sequence to obtain the second sequence.
  • the sending device maps the first sequence to M even-numbered subcarriers of 2M subcarriers, and maps the second sequence.
  • the method further includes:
  • the transmitting device performs M ⁇ M DFT on the first time domain sequence to obtain the third sequence.
  • the transmitting device may map the third sequence to the M even-numbered subcarriers of the 2M subcarriers.
  • the transmitting device maps the fourth sequence to the M even-numbered subcarriers, and maps the third sequence to the M odd-numbered subcarriers. That is, the first sequence and the fourth sequence are the same sequence, and are mapped to the M even-numbered subcarriers, and the second sequence and the third sequence are the same sequence, and are mapped to the M odd-numbered subcarriers.
  • mapping the second sequence to the M odd-numbered subcarriers in the 2M subcarriers includes: the transmitting device mapping the third sequence to the M odd-numbered subcarriers;
  • Mapping the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers including: the sending device performing the D ⁇ of the M ⁇ M by using the second time domain sequence to obtain the fourth sequence, and Mapping the fourth sequence onto the M even-numbered subcarriers.
  • the sending device does not generate the first time domain sequence, but the third sequence is from the perspective of the time domain, and the corresponding first time domain sequence is the second sequence.
  • the second joint transformation is a joint transformation of an inverse discrete Fourier transform (IDFT) and a second phase rotation of M ⁇ M
  • IDFT inverse discrete Fourier transform
  • the second joint transform is an inverse transform of the first joint transform.
  • the first time domain sequence is represented by x(t)
  • the second time domain sequence is represented by y(t).
  • the IDSF- transformed sequence of the third sequence a(k) is x(t)e -j ⁇ 2t ⁇ /2M
  • the second phase rotation is performed on x(t)e -j ⁇ 2t ⁇ /2M to obtain x ( t).
  • the sending device maps the first sequence to M even-numbered subcarriers of 2M subcarriers, and maps the second sequence.
  • the method further includes:
  • the mapping to the subcarrier is an even number subcarrier or an odd number subcarrier
  • the correspondence between the time domain signal and the frequency domain signal is determined to be M ⁇ .
  • the DFT transform of M or the joint transform of the first linear phase rotation and the M ⁇ M DFT transform, can ensure the I/Q orthogonal characteristics of the first time domain sequence and the second time domain sequence, such that the first time domain signal
  • the peak-to-average ratio (or three-quantity amount) added to the second time domain signal reflects the peak-to-average ratio (or cubic metric) of the last transmitted true signal.
  • the method further includes:
  • the transmitting device performs a DFT of 2M ⁇ 2M on the extended sequence of the second time domain sequence.
  • the second sequence is the fourth sequence
  • the length of the second time domain sequence is M
  • the second sequence is 2M ⁇ of the extended sequence of the second time domain sequence.
  • the length of the extended sequence of the second time-domain sequence is 2M
  • the last M elements of the extended sequence of the second time-domain sequence are the second The inverse of the M elements of the time domain sequence. Therefore, the extended sequence of the second time domain sequence is an antisymmetric sequence. According to the characteristics of the DFT, it is known that the sequence of the DFT after the antisymmetric extended sequence has a value of zero on the even subcarriers.
  • the second time domain sequence is mapped to M odd-numbered subcarriers after 2M ⁇ 2M DFT.
  • the third sequence can be mapped to the M even-numbered subcarriers
  • the fourth sequence is mapped to the M odd-numbered subcarriers.
  • the third sequence when the third sequence is viewed from the perspective of the time domain, the length of the first time domain sequence is M, and the third sequence is 2M for the extended sequence of the first time domain sequence.
  • M even-numbered elements in the sequence obtained by DFT of 2M the length of the extended sequence of the first time-domain sequence is 2M, and the last M elements of the extended sequence of the first time-domain sequence and the The M elements of the one-time domain sequence are the same. Therefore, the extended sequence of the first time domain sequence is a symmetric sequence. According to the characteristics of the DFT, it is known that the sequence of the DFT of the symmetrically extended sequence has a value of zero on the odd subcarriers.
  • the first time domain sequence is a sequence in which the third sequence becomes 2M long after the odd index is inserted in the frequency domain, and the first M elements of the 2M long time domain sequence obtained by the 2M ⁇ 2M IDFT.
  • the zero insertion operation can be expressed as: a1, a2, a3, .., -> a1, 0, a2, 0, a3, 0, ....
  • the sending device maps the first sequence to Before mapping the second sequence to the M odd-numbered subcarriers of the 2M subcarriers on the M even-numbered subcarriers of the 2M subcarriers, the method further includes:
  • the sending device acquires the first time domain sequence and the second time domain sequence
  • the transmitting device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, including:
  • the transmitting device performs DMF of 2M ⁇ 2M on the sequence extended by the first time domain sequence to obtain the third sequence (an even-numbered element of a 2M-long sequence after DFT), and maps the third sequence Up to the M even-numbered subcarriers, performing a DFT of 2M ⁇ 2M on the extended sequence of the second time domain sequence to obtain the fourth sequence (an odd-numbered element of a 2M-long sequence after DFT), And mapping the fourth sequence onto the M odd-numbered subcarriers.
  • the transmitting device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and before mapping the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, the method further includes:
  • the sending device acquires the second time domain sequence
  • the sending device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, including:
  • the last M elements are the same as the first M elements, respectively, and correspondingly, from the perspective of the time domain.
  • the time domain sequence corresponding to the sequence, that is, the first time domain sequence, in the extended sequence of the first time domain sequence, the last M elements are respectively opposite numbers of the first M elements.
  • the method further includes:
  • the transmitting device performs a DFT of 2M ⁇ 2M on the extended sequence of the second time domain sequence.
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence.
  • the length of the second time domain sequence is M
  • the fourth sequence is an M even numbered element in a sequence obtained by performing DMT of 2M ⁇ 2M on the extended sequence of the second time domain sequence, where the The extended sequence of the two time domain sequence has a length of 2M, and the last M elements of the extended sequence of the second time domain sequence are identical to the M elements of the second time domain sequence.
  • the length of the first time domain sequence is M
  • the third sequence is 2M for the extended sequence of the first time domain sequence.
  • the M number in the sequence obtained by DFT of ⁇ 2M is an odd element
  • the length of the extended sequence of the first time domain sequence is 2M
  • the last M elements of the extended sequence of the first time domain sequence and the first The first M of a time domain sequence The opposite is true.
  • the sending device maps the first sequence to Before mapping the second sequence to the M odd-numbered subcarriers of the 2M subcarriers on the M even-numbered subcarriers of the 2M subcarriers, the method further includes:
  • the sending device acquires the first time domain sequence and the second time domain sequence
  • the transmitting device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, including:
  • the transmitting device performs a DFT of 2M ⁇ 2M on the sum of the extended sequence of the first time domain sequence and the extended sequence of the second time domain sequence, and maps the DFT sequence to the 2M subcarriers; or
  • the transmitting device performs a DFT of 2M ⁇ 2M on the extended sequence of the first time domain sequence to obtain the third sequence (ie, a sequence obtained by extracting odd-numbered elements of the sequence after DFT), and the third sequence is obtained. Mapping to the M odd-numbered subcarriers, performing a 2M ⁇ 2M DFT on the extended sequence of the second time domain sequence to obtain the fourth sequence (ie, a sequence obtained by extracting even-numbered elements of the sequence after DFT) And mapping the fourth sequence onto the M even-numbered subcarriers.
  • the sending device maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the second sequence to Before the M odd-numbered subcarriers of the 2M subcarriers, the method further includes:
  • the sending device acquires the second time domain sequence
  • the sending device maps the first sequence to the M even-numbered sub-carriers of the 2M sub-carriers, and maps the second sequence to the M odd-numbered sub-carriers of the 2M sub-carriers, including:
  • the first time domain signal or the second time domain signal has a symmetric or antisymmetric feature, so the corresponding two frequency domain signals are respectively mapped on even subcarriers or odd subcarriers.
  • the two signals transmitted by the device are frequency division orthogonal.
  • the transmitted signal also requires that the first signal and the second time domain signal corresponding to the third signal and the fourth signal, except one complex factor, one is an I channel, and one is a Q channel, so the two signals are added after the peak
  • the average ratio characteristics are better, and the symmetrical expansion and the antisymmetric expansion respectively obtain the peak-to-average ratio characteristics of the two signals added.
  • the two signals in the embodiments of the present invention may be in various combinations. These combinations can all be applied to the alternative embodiments described above.
  • the two signals may be a combination of reference signals and control information carried by the control channel, or a combination of reference signals and data carried by the data channel, or a combination of reference signals and other information to be transmitted.
  • the reference signal may be an uplink reference signal or a downlink reference signal.
  • control information may be the uplink control information carried by the uplink control channel, such as the uplink control information carried on the physical uplink control channel (PUCCH) or the downlink control information carried by the downlink control channel, such as physical Downlink control information carried on a downlink control channel (PDCCH).
  • uplink control information carried on the physical uplink control channel (PUCCH) or the downlink control information carried by the downlink control channel, such as physical Downlink control information carried on a downlink control channel (PDCCH).
  • PUCCH physical uplink control channel
  • PDCCH physical Downlink control information carried on a downlink control channel
  • the data channel may also be an uplink data channel, such as a Physical Uplink Shared Channel (PUSCH), or a downlink data channel, such as a Physical Downlink Shared Channel (PDSCH).
  • PUSCH Physical Uplink Shared Channel
  • PDSCH Physical Downlink Shared Channel
  • the information to be transmitted may also be system information carried by a broadcast channel, such as information carried by a physical broadcast channel (PBCH), or a synchronization signal used for synchronization, such as a primary synchronization signal (Priss Synchronization Signal, PSS). ) or Secondary Synchronization Signal (SSS).
  • PBCH physical broadcast channel
  • PSS Primary Synchronization Signal
  • SSS Secondary Synchronization Signal
  • the third sequence above corresponds to a reference signal, and the third sequence is a sequence determined in advance by the transmitting device.
  • the third sequence is a sequence obtained by the transmitting device according to a predetermined rule.
  • the third sequence may be mapped to the M even-numbered subcarriers, in which case the third sequence is the first sequence, Corresponding to the first implementation of the first alternative embodiment described above.
  • the third sequence may also be mapped to M odd-numbered subcarriers.
  • the third sequence, that is, the second sequence corresponds to the second implementation of the first alternative embodiment.
  • the fourth sequence described above corresponds to data carried by the data channel or control information carried by the control channel.
  • the second time domain sequence is a sequence carrying M first information elements, and the M first information elements may be data carried by control information or data channels.
  • the transmitting device may acquire a third sequence according to a predetermined rule, and the third sequence may be an existing reference signal sequence, or may be other sequences having low peak-to-average ratio characteristics, such as a sequence having a constant model.
  • the sending device may use the time domain sequence corresponding to the reference signal sequence to carry the sequence of the M first information elements to obtain the second time domain sequence.
  • the bearer may be that the time domain sequence corresponding to the reference signal sequence is multiplied by the sequence of the M first information elements at the corresponding location.
  • the second time domain sequence can also be obtained by: the transmitting device acquiring a sequence having a low peak-to-average ratio characteristic according to a predefined rule, and multiplying the M first by the element of the corresponding position of the sequence. A corresponding location element in the information element, that is, modulating the M first information elements with the sequence to obtain the second time domain sequence.
  • the third sequence may also be a sequence carrying information to be sent.
  • the first time domain sequence is a sequence obtained by carrying M second information elements in a predetermined sequence.
  • the combination of the two signals may be combined as follows:
  • the M first information elements are primary synchronization signals, and the M second information elements are secondary synchronization signals;
  • the M first information elements are secondary synchronization signals, and the M second information elements are primary synchronization signals;
  • the M first information elements are a first part of the secondary synchronization signal, and the M second information elements are a second part of the secondary synchronization signal;
  • the M first information elements are a first part of a primary synchronization signal, and the M second information elements are a second part of the primary synchronization signal;
  • the M first information elements are physical broadcast channel information, and the M second information elements are primary synchronization signals; or
  • the M first information elements are physical broadcast channel information, and the M second information elements are secondary synchronization signals.
  • the information carried by the broadcast channel (such as the information carried by the PBCH) and the data carried by the downlink data channel (such as the data carried by the PDSCH) are subjected to frequency division multiplexing as shown in FIG. 4, where the PBCH corresponds to the above embodiment.
  • the in-phase branch x(t) in the PDSCH corresponds to the orthogonal branch y(t) in the above embodiment, so that the above two channels can maintain a low peak-to-average ratio when simultaneously transmitted.
  • the PSS and the SSS may be time-domain multiplexed before the DFT mapping, where the PSS and the SSS respectively correspond to the in-phase branch x(t) and the orthogonal branch y(t) in the foregoing embodiment, and then The in-phase branch x(t) and the orthogonal branch y(t) are mapped to the same symbol after DFT, so that the above two synchronization signals can also maintain a low peak-to-average ratio when simultaneously transmitted.
  • the PSS or SSS can be divided into an in-phase branch and a quadrature branch for interleaving transmission.
  • the SSS is divided into two mutually independent independent signals, that is, an in-phase branch and an orthogonal branch, wherein the in-phase branch It is used to transmit the orthogonal components of the SSS, and the orthogonal branches are used to transmit the in-phase components of the SSS.
  • the two signals correspond to the two comb teeth of the time-frequency resource to be transmitted, as shown in FIG.
  • the first type of signal corresponds to a first seed frame type, a Frequency Division Duplexing (FDD) subframe type
  • the second type of signal corresponds to a second seed frame type
  • TDD Time Division Duplexing
  • different transmission times can be distinguished by mapping a signal into an in-phase branch and an orthogonal branch signal onto the same symbol.
  • the first signal corresponds to the first transmission time
  • the second signal corresponds to the second transmission time.
  • the predetermined sequence in all embodiments of the present invention for example, the sequence for carrying the M first information elements or the third sequence in the first implementation, It may be a ZC (Zadoff-Chu) sequence, or a cyclic extension sequence of a ZC sequence, or a truncated sequence of a ZC sequence, or other sequences of low peak-to-average/cubic measures.
  • it may be a time domain sequence corresponding to a reference signal sequence used in the current LTE system, or a frequency domain sequence.
  • the predetermined sequence adopts a reference signal sequence in current LTE, optionally, it may be expressed as follows:
  • J is an even number.
  • J is the length of the ZC sequence.
  • J M; of course, J may not be equal to M; q is an integer that is homogenous to J.
  • the predetermined sequence may also be other sequences having low peak-to-average ratio characteristics.
  • the 2M subcarriers in all embodiments of the present invention may be all subcarriers on the entire bandwidth, and may also be partial subcarriers on the entire bandwidth.
  • the 2M subcarriers are consecutive 2M subcarriers in the frequency domain or 2M subcarriers equally spaced.
  • the remaining subcarriers in the time domain symbols can also carry other signals. That is, the signal carried on the 2M can also be transmitted on the same time domain symbol in a manner of frequency division multiplexing with other signals.
  • the signals sent by the terminal device A such as the control information and the reference signal, and the Sounding Reference Signal (SRS) sent by the terminal device B can be multiplexed into the physical resources on the same symbol by frequency division.
  • the frequency division multiplexed control information and the first time domain signal and the second time domain signal corresponding to the reference signal are I/Q orthogonal, and do not result in a higher peak-to-average ratio.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence.
  • the embodiment further includes:
  • Step 300a1 The sending device acquires the third sequence a(k) and the second time domain sequence
  • step 300a2 the transmitting device performs the first phase rotation on the second time domain sequence y(t), and performs DFT on the rotated second time domain sequence to obtain the fourth sequence.
  • the transmitting device maps the third sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the fourth sequence to the M odd numbered subcarriers of the 2M subcarriers.
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence.
  • the embodiment further includes: the sending device acquiring the third sequence a(k) and In the second time domain sequence y(t), the transmitting device performs DFT on the second time domain sequence to obtain the fourth sequence.
  • the transmitting device maps the third sequence to M odd-numbered subcarriers of the 2M subcarriers, and maps the fourth sequence to the M even-numbered subcarriers of the 2M subcarriers.
  • the sending device may generate the sending signal by transforming the sequence mapped on the 2M subcarriers into the time domain, and the sending device performs IFFT by using the sequence mapped on the 2M subcarriers.
  • the transmission signal is generated.
  • the embodiment of the present invention may be implemented in this manner when generating the sending signal, and details are not described herein again.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence.
  • the embodiment further includes:
  • Step 300b1 The sending device acquires the second time domain sequence.
  • the third sequence in the embodiment of the present invention may be a reference signal sequence, that is, the information to be transmitted is not carried, or may be a sequence carrying the M second information elements, which is the same in subsequent embodiments. I will not repeat them later. If the third sequence carries the sequence of the M second information elements, step 300b1 also acquires the first time domain sequence.
  • the manner of acquiring the first time domain sequence and the second time domain sequence is not limited. Reference can be made to the above description.
  • the sending device may acquire a predetermined sequence according to a preset rule, that is, obtain a third sequence. If the first time domain sequence carries information to be sent, the sending device may acquire a predetermined sequence, and then carry the information to be transmitted to the predetermined sequence to obtain a first time domain sequence.
  • the predetermined sequence may be acquired according to a predetermined rule, or may be pre-stored to the sending device, or may be negotiated in advance by the sending device and the receiving device, and the like.
  • the manner of obtaining the second time domain sequence is similar to the case where the first time domain sequence carries the information to be sent, and details are not described herein again.
  • step 300b2 the transmitting device performs joint transformation of the first linear phase rotation and the M*M DFT transform on the second time domain sequence to obtain the fourth sequence.
  • the transmitting device also performs DFT on the first time domain sequence.
  • the transmitting device may further convert the first time domain sequence and the second time domain sequence together. Therefore, in this step, the order of how to transform the first time domain sequence and the second time domain sequence is not limited.
  • the transmitting device maps the third sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the fourth sequence to the M odd numbered subcarriers of the 2M subcarriers.
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence.
  • the embodiment further includes:
  • Step 300c1 the sending device acquires the second time domain sequence
  • Step 300c2 performing DFT on the second time domain sequence to obtain the third sequence.
  • the step further includes: the transmitting device performing a joint transformation of the first linear phase rotation and the M ⁇ M DFT transform on the first time domain sequence.
  • Said fourth sequence such that in step 301, the transmitting device maps the third sequence to M odd-numbered subcarriers of 2M subcarriers, and maps the fourth sequence to M of the 2M subcarriers Even numbered subcarriers.
  • the transmitting device does not acquire the first time domain sequence but directly generates a third sequence, the transmitting device directly maps the third sequence onto the M odd number subcarriers. If the third sequence is viewed from the perspective of the time domain, the first time domain sequence corresponding to the third sequence is a sequence of the second joint transformation of the third sequence, which is equivalent to the The three sequences are first subjected to IDFT, and then the second phase rotation described above is performed. See the description above for details.
  • the DFTs in the first mode and the second mode described above are both M ⁇ M long DFTs.
  • the third mode is shown in Figures 8a, 8b, 8c and 8d, where the DFT is a 2M x 2M long DFT.
  • the first sequence is the third sequence
  • the second sequence is the fourth sequence.
  • the embodiment further includes:
  • step 300d1 the sending device acquires the first time domain sequence and the second time domain sequence.
  • the expanded sequence can be expressed as:
  • the first time domain sequence is extended to obtain a symmetric sequence with M period
  • the second time domain sequence is extended to obtain an antisymmetric sequence with M period. Therefore, in the above step 300d2, the first time domain sequence is repeated once in M, and the second time domain sequence repeats the inverse of its M elements by M.
  • step 300d3 the sending device performs a DFT of length 2M ⁇ 2M on the sum of the first time domain sequence and the second time domain sequence, and maps the DFT sequence to the 2M subcarriers.
  • step 300d3 may also perform a DFT of length 2M ⁇ 2M for the extended first time domain sequence and the extended second time domain sequence, and map the DFT sequence to the 2M subcarriers.
  • the third sequence is still mapped to the M even numbered subcarriers
  • the fourth sequence is mapped to the M odd numbered subcarriers.
  • the embodiment only needs to process the second time domain sequence.
  • the second time domain sequence can be extended as described above.
  • the third sequence is mapped onto the even numbered subcarriers.
  • the second time domain sequence can be extended as described above.
  • the third sequence is mapped onto the odd numbered subcarriers.
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence.
  • the embodiment further includes:
  • the embodiment only needs to process the second time domain sequence.
  • the sending signal includes a first signal and a second signal, where a corresponding signal on the M even-numbered subcarriers is the first signal, and a corresponding signal on the M odd-numbered subcarriers Is the second signal;
  • the first signal corresponding to the first power adjustment value and the second signal corresponding to the second power adjustment value are sent by the sending device.
  • the first signal and the second signal in the embodiment of the present invention may be sent by using different power adjustment values.
  • the P in the first time domain sequence corresponding to the third sequence and the Q in the second time domain sequence may be the same or different.
  • signals carried on different sets of carriers may correspond to different power adjustment values. Therefore, flexible power setting can be performed according to the characteristics of the signal to be transmitted to achieve superior system performance, for example.
  • a higher power adjustment value may be set for the reference signal, and a lower power adjustment value is set for the data to be transmitted.
  • a higher power adjustment value can be set for the data to be transmitted, and a lower power adjustment value is set for the reference signal.
  • FIG. 9 is a schematic flowchart diagram of a signal receiving method according to an embodiment of the present invention. It should be noted that the method can be used as a separate embodiment or can be used together with the above signal transmission method. For the same content as the above embodiment, reference may be made to the description in the foregoing embodiment, and details are not described herein. This embodiment includes the following steps.
  • Step 901 The receiving device receives signals from 2M subcarriers, where the 2M subcarriers are subcarriers on the same time domain symbol.
  • Step 902 The receiving device performs fast Fourier transform (FFT) on the signal to obtain a received first sequence and a second sequence, where the first sequence is carried in the 2M subcarriers.
  • FFT fast Fourier transform
  • the second sequence is carried on M odd-numbered subcarriers in the 2M subcarriers
  • the first sequence is one of the third sequence and the fourth sequence
  • the second sequence is the other of the third sequence and the fourth sequence
  • the fourth sequence is a sequence carrying M first information elements
  • Step 903 The receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, where the first time domain sequence corresponding to the third sequence is obtained.
  • the second time domain sequence corresponding to the fourth sequence at the same time satisfies an element in the first time domain sequence and the second time domain sequence other than a complex factor, the other is an in-phase branch, and the other It is an orthogonal branch.
  • the signal processing of the receiver can utilize the above-mentioned I/Q orthogonal characteristics, corresponding to a specific transmission mode, and can have a corresponding receiving mode. For example, at a time when the second time domain sequence is a quadrature branch, the receiver may only acquire the received orthogonal branch of the second time domain sequence for signal processing to acquire M first information elements. Generally, the receiver is based on the characteristics of the I path (or Q path) except for a complex factor at a time according to the transmitted signal, and the complex factor can be removed at the receiving side to obtain the I path (or Q path) in the signal.
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and may perform signal processing based on the result of the channel estimation.
  • the third sequence is a reference signal sequence
  • the result of the channel estimation may be a result obtained by performing channel estimation based on the third sequence.
  • the third sequence is not a reference signal sequence
  • the result of the channel estimation may be obtained by channel estimation based on other signals. For example, it may be obtained by channel estimation based on a common reference signal.
  • the time domain sequence corresponding to the two signals transmitted on the same time domain symbol satisfies the characteristics of the in-phase branch and the orthogonal branch transmission, that is, the same time domain symbol transmission.
  • the elements of the time domain sequence corresponding to the two signals are orthogonal I/Q, so when the two signals are simultaneously transmitted in the same time domain symbol (such as a symbol), the amplitude of the signal after the two signals are superimposed The low peak-to-average ratio can be maintained. Therefore, the signals superimposed by the two signals do not have a peak-to-average ratio due to the randomness of the phase, and the increased peak-to-average ratio is small.
  • the two signals satisfy the characteristics of frequency division orthogonality, and there is no other signal on the subcarrier of one signal, and the two signals can be easily distinguished, so that the two signals have no interference or little interference when receiving.
  • the processing of the receiving device is different for the different alternative embodiments described above.
  • the first sequence is the third sequence, and the second sequence is the fourth sequence;
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device Receiving, by the receiving device, the received fourth sequence carried on the M odd-numbered subcarriers Generating a second joint transform to obtain the received second time domain sequence, wherein the second joint transform is a joint transform of an inverse discrete Fourier transform IDFT and a second phase rotation;
  • the receiving device demodulates and acquires the M first information elements from the received second time domain sequence.
  • the first time domain sequence is a sequence obtained by IDFT of the third sequence. It should be noted that the first time domain sequence does not necessarily need to be transformed by the third sequence, but the third sequence has the characteristic when the third sequence is viewed from the perspective of the time domain. For example, if the third sequence is an RS sequence, there is no need to perform IDFT processing on the RS sequence. And if the third sequence also carries an information element, the receiving device may perform IDFT on the received third sequence to obtain the received first time domain sequence.
  • Performing a second joint transformation on the received fourth sequence to obtain the received second time domain sequence including:
  • the receiving device performs a joint transformation of an M ⁇ M inverse discrete Fourier transform IDFT and a second phase rotation of the M elements on the received fourth sequence to obtain the received second time domain sequence, where ,
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the first time domain sequence is a sequence obtained by the second joint transformation of the third sequence
  • the first time domain sequence does not necessarily need to be transformed by the third sequence, but the third sequence has the characteristic when the third sequence is viewed from the perspective of the time domain.
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device demodulates and acquires the M first information from the received second time domain sequence element.
  • the method further includes:
  • the receiving device obtains M second information elements carried by the first time domain sequence by demodulating the received first time domain sequence.
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device performs channel equalization on the received fourth sequence
  • the receiving device expands the received fourth sequence by inserting 0 to a length of 2M;
  • the receiving device performs a 2M ⁇ 2M IDFT on the extended fourth sequence to obtain the received second time domain sequence, where the second time domain sequence is the 2M ⁇ 2M IDFT
  • the first M elements of the sequence of the IDFT are the opposite of the last M elements of the sequence after the IDFT, so the first M elements of the sequence obtained after IDFT are obtained to obtain the received second time domain sequence;
  • the receiving device acquires the M first information elements by demodulating the received second time domain sequence.
  • the method further includes:
  • the receiving device performs channel equalization on the received third sequence
  • the receiving device expands the received third sequence into a sequence of length 2M by inserting 0;
  • the receiving device acquires M second information elements carried by the third sequence by demodulating the received first time domain sequence.
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device expands the fourth sequence by inserting 0 to a length of 2M;
  • the receiving device performs 2M ⁇ 2M IDFT on the extended fourth sequence to obtain the second time domain sequence, where the second time domain sequence is the first M sequences of the 2M ⁇ 2M IDFT sequence Element or last M elements;
  • the receiving device acquires the M first information elements by demodulating the second time domain sequence.
  • the method further includes:
  • the receiving device expands the third sequence by inserting 0 to a length of 2M;
  • the receiving device acquires M second information elements carried by the third sequence by demodulating the first time domain sequence.
  • the two signals are the uplink reference signal and the uplink control information to be transmitted.
  • the uplink control channel to be transmitted includes M information elements, the sending device is a terminal device, and the receiving device is an access network device.
  • the first sequence is a third sequence and corresponds to an uplink reference signal, and the second sequence is a fourth sequence and corresponds to uplink control information.
  • the uplink control information and the uplink reference signal occupy 2M subcarriers on one time domain symbol.
  • the uplink control information occupies M odd-numbered subcarriers (for example, subcarriers 1, 3, 5, 7 ...) of 2M subcarriers, and the uplink reference signal occupies M even subcarriers of 2M subcarriers (For example, subcarriers 0, 2, 4, 6).
  • the uplink control information to be transmitted may also occupy M even-numbered sub-carriers of 2M sub-carriers, and the uplink reference signal occupies M odd-numbered sub-carriers of 2M sub-carriers.
  • the previous method in this example is described as an example.
  • the elements of the first sequence may be obtained according to a preset rule, for example, may be a Zadoff-Chu sequence (ZC sequence), or may be a cyclic extension sequence of a ZC sequence, or may be a ZC sequence.
  • ZC sequence Zadoff-Chu sequence
  • LTE Long Term Evolution
  • the first sequence corresponding to the uplink reference signal is predefined.
  • the second time domain sequence corresponding to the second sequence is constructed based on the first sequence, wherein the second time domain sequence carries modulation phase information of the M information elements, and the first sequence corresponds to
  • the time domain signal is an in-phase branch, and the signal corresponding to the second time domain sequence is a quadrature branch.
  • the time domain signal corresponding to the second sequence and the time domain signal corresponding to the first sequence differ by one positive and negative imaginary unit.
  • the terminal device And acquiring, by the terminal device, the pre-defined first sequence, and using the time domain sequence corresponding to the first sequence to carry the M information elements to obtain a second time domain sequence.
  • the first time domain sequence corresponding to the first sequence is represented as x(t).
  • Q t j or -j, wherein Q t is j or -j is related to the tth information element of the M information elements, for example, if the tth information element to be transmitted is 1, Q t can is j, if the t-th transmission information element is to be -1, Q t may -j, or vice versa.
  • the elements at the same time of the first time domain sequence and the second time domain sequence satisfy the characteristics of the in-phase branch and the orthogonal branch in the corresponding baseband signal except for one complex common factor z(t).
  • the terminal device After acquiring the first sequence of the second time domain sequence, the terminal device performs a first joint transformation on the second time domain sequence, for example, the first linear phase rotation may be used to obtain the rotated second time domain sequence, and the rotation is performed.
  • the subsequent second time domain sequence performs DFT to obtain a second sequence, then maps the second sequence to the M odd number subcarriers, and maps the first sequence to the M even numbered subcarriers.
  • the M ⁇ M DFT transform Since the correspondence between the time domain signal and the frequency domain signal is determined according to whether the mapped subcarrier is an even number subcarrier or an odd number subcarrier, is the M ⁇ M DFT transform, or the first linear phase rotation and the M ⁇ M DFT
  • the joint transformation of the transform can ensure the I/Q orthogonality of the first time domain sequence and the second time domain sequence, such that the peak-to-average ratio (or the third quantitative amount) of the first time domain signal and the second time domain signal are added. ) reflects the peak-to-average ratio (or cubic metric) of the last transmitted real signal.
  • the elements at the same time of the first time domain sequence and the second time domain sequence satisfy the characteristics of the in-phase branch and the orthogonal branch in the baseband signal after extracting a complex common factor. That is, after the first time domain sequence x(t) and the second time domain sequence y(t) extract a common factor, one of them is an in-phase branch of the baseband signal, and one is an orthogonal branch of the baseband signal. .
  • the common factor is a complex factor. In special cases, the complex factor can be a constant.
  • the values of g(t) and h(t) are +1 or -1, such that the corresponding portion of the first time domain sequence after extracting the common factor is an in-phase branch, and the second time domain sequence is extracted.
  • the corresponding part after the factor is an orthogonal branch.
  • the sequence x(t) on the M even-numbered subcarriers is a known cyclically extended ZC sequence
  • channel estimation can be performed based on the known sequence, and M odd numbers can be obtained by some channel interpolation algorithm.
  • the interpolation algorithm may be a typical interpolation algorithm such as linear interpolation or linear extrapolation.
  • the modulation phase value is further detected based on the channel values on the M subcarriers in the second subcarrier group estimated and the second sequence y(k). Thereby, a modulation phase value carried by each of the M odd-numbered subcarriers is obtained.
  • FIG. 10 is a schematic structural diagram of a signal sending apparatus according to an embodiment of the present invention. It should be noted that the device may be used to perform the method in the foregoing embodiment. Therefore, the same content as the foregoing embodiment may be referred to the description in the foregoing embodiment, and details are not described herein.
  • the device in this embodiment may include a processing module and a sending module.
  • the device may further include a storage module, a receiving module, and the like.
  • the storage module can store, for example, a predetermined sequence, and can also store predetermined rules and the like.
  • the processing module is configured to map the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and map the second sequence to the M odd-numbered subcarriers of the 2M subcarriers, where the The first sequence is one of a third sequence and a fourth sequence, the second sequence is the other of the third sequence and the fourth sequence, and the 2M subcarriers are children on the same time domain symbol a carrier, the fourth sequence is a sequence carrying M first information elements, and the second time domain sequence corresponding to the fourth sequence and the first time domain sequence corresponding to the third sequence are at the same time The element satisfies one of the first time domain sequence and the second time domain sequence except the one complex factor, and the other is an orthogonal branch;
  • the processing module is further configured to: generate a transmission signal by transforming a sequence mapped on the 2M subcarriers into a time domain;
  • the sending module is configured to send the sending signal generated by the processing module.
  • the time domain sequence corresponding to the two signals transmitted on the same time domain symbol satisfies the characteristics of the in-phase branch and the orthogonal branch transmission, that is, the same time domain symbol transmission.
  • the time-domain sequences corresponding to the two signals are orthogonal, so when the two signals are simultaneously transmitted in the same time-domain symbol (such as a symbol), the amplitude of the signal superimposed by the two signals can maintain a low peak. Therefore, the signal superimposed on the two signals does not have a peak-to-average ratio due to the randomness of the phase, and the increased peak-to-average ratio is small.
  • the two signals satisfy the characteristics of frequency division orthogonality, and there is no other signal on the subcarrier of one signal, and the two signals can be easily distinguished, so that the two signals have no interference or little interference when receiving.
  • the first sequence is the third sequence, and the second sequence is the fourth sequence;
  • the processing module is configured to perform a first joint transformation on the second time domain sequence to obtain the second sequence, before the second sequence is mapped to the M odd-numbered subcarriers of the 2M subcarriers, where
  • the first joint transform is a joint transformation of a first linear phase rotation and a DFT transform of M elements.
  • the first time domain sequence is a sequence obtained by the inverse discrete Fourier transform IDFT of the first sequence
  • the processing module is configured to perform a first joint transformation on the second time domain sequence to obtain the second sequence:
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the processing module is configured to map the first sequence to M even-numbered subcarriers of the 2M subcarriers by performing DFT on the second time domain sequence to obtain the first sequence, and The first sequence is mapped onto the M even-numbered subcarriers.
  • the processing module maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and before mapping the second sequence to the M odd-numbered subcarriers of the 2M subcarriers, :
  • the method for the processing module to obtain the first time domain sequence and the second time domain sequence may refer to the foregoing description, and details are not described herein again.
  • the length of the second time domain sequence is M
  • the fourth sequence is M odd-numbered elements in a sequence obtained by performing DMT of 2M ⁇ 2M on the extended sequence of the second time domain sequence, where the The length of the extended sequence of the second time domain sequence is 2M, and the last M elements of the extended sequence of the second time domain sequence are respectively opposite numbers of the M elements of the second time domain sequence;
  • the length of the first time domain sequence is M
  • the third sequence is an M even numbered element in a sequence obtained by performing DMT of 2M ⁇ 2M on the extended sequence of the first time domain sequence, where the The length of the extended sequence of the one-time domain sequence is 2M, and the last M elements of the extended sequence of the first time-domain sequence are respectively identical to the M elements of the second time-domain sequence.
  • the processing module maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and before mapping the second sequence to the M odd-numbered subcarriers of the 2M subcarriers, ,
  • the processing module maps the first sequence to the M even-numbered subcarriers of the 2M subcarriers, and maps the second sequence to the M odd-numbered subcarriers of the 2M subcarriers as follows:
  • the first time domain sequence and the second time domain sequence are expanded in a manner opposite to that of the third embodiment.
  • the transmission signal includes a first signal and a second signal, where a corresponding signal on the M even-numbered subcarriers is the first signal, and a corresponding signal on the M odd-numbered subcarriers is The second signal;
  • the sending module sends the sending signal as follows:
  • the 2M subcarriers may be all subcarriers on the entire bandwidth, and may also be partial subcarriers on the entire bandwidth.
  • the signal sending device in this embodiment may be a terminal device for the uplink signal, or may be a processor in the terminal device.
  • the downlink signal may be an access network device, and may also be a processor in the access network device.
  • FIG. 11 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention. It should be noted that the device may be used to perform the method in the foregoing embodiment. Therefore, the same content as the foregoing embodiment may be referred to the description in the foregoing embodiment, and details are not described herein.
  • the device in this embodiment may include a processing module and a receiving module.
  • the device may further include a storage module, a sending module, and the like.
  • the storage module can store, for example, a predetermined sequence, and can also store predetermined rules and the like.
  • the receiving module is configured to receive signals from 2M subcarriers, where the 2M subcarriers Is a subcarrier on the same time domain symbol;
  • the processing module is configured to perform fast Fourier transform FFT on the signal received by the receiving module to obtain a received first sequence and a second sequence, where the first sequence is carried in the 2M subcarriers On the M even-numbered subcarriers, the second sequence is carried on M odd-numbered subcarriers in the 2M subcarriers, and the first sequence is one of the third sequence and the fourth sequence The second sequence is the other of the third sequence and the fourth sequence, the fourth sequence is a sequence carrying M first information elements;
  • the processing module is further configured to perform signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquire the M first information elements, where the first time domain corresponding to the third sequence And the element of the second time domain sequence corresponding to the fourth sequence at the same time satisfies that one of the first time domain sequence and the second time domain sequence is an in-phase branch except for one complex factor, and the other It is an orthogonal branch.
  • the time domain sequence corresponding to the two signals transmitted on the same time domain symbol satisfies the characteristics of the in-phase branch and the orthogonal branch transmission, that is, the same time domain symbol transmission.
  • the time-domain sequences corresponding to the two signals are orthogonal, so when the two signals are simultaneously transmitted in the same time-domain symbol (such as a symbol), the amplitude of the signal superimposed by the two signals can maintain a low peak. Therefore, the signal superimposed on the two signals does not have a peak-to-average ratio due to the randomness of the phase, and the increased peak-to-average ratio is small.
  • the two signals satisfy the characteristics of frequency division orthogonality, and there is no other signal on the subcarrier of one signal, and the two signals can be easily distinguished, so that the two signals have no interference or little interference when receiving.
  • the first sequence is the third sequence, and the second sequence is the fourth sequence;
  • the processing module is configured to perform signal processing on the received signals on the M subcarriers carrying the fourth sequence to obtain the M first information elements:
  • the first time domain sequence is a sequence obtained by the first sequence of the IDFT
  • the processing module performs a second joint transformation on the received second sequence to obtain the received second time domain sequence:
  • the first sequence is the fourth sequence
  • the second sequence is the third sequence
  • the processing module performs signal processing on the received signals on the M subcarriers carrying the fourth sequence to obtain the M first information elements:
  • the processing module performs FFT on the signal to obtain the received first sequence and the second sequence
  • the processing module is further configured to:
  • the receiving device performs signal processing on the received signals on the M subcarriers carrying the fourth sequence, and acquires the M first information elements, including:
  • the receiving device expands the received fourth sequence by inserting 0 to a length of 2M;
  • the M first information elements are obtained by demodulating the received second time domain sequence.
  • the processing module performs a fast Fourier transform FFT on the signal to obtain the received first sequence and the second sequence
  • the processing module is further configured to:
  • the first time domain sequence and the second time domain sequence are expanded in a manner opposite to that of the third embodiment.
  • the extended fourth received sequence is subjected to IDM of 2M ⁇ 2M, wherein the received second time domain sequence is the first M elements of the sequence after the IDFT or is the sequence after the IDFT. The last M elements.
  • the signal receiving device in this embodiment may be an access network device for the uplink signal, and may also be a processor in the access network device.
  • the downlink signal may be a terminal device, and may also be a processor in the terminal device.
  • the embodiments of the present invention can be applied to a single carrier multiple access method, such as DFT-S-OFDM (Discrete Fourier Transformation-Spread-OFDM) or Filter-SC-OFDM (Filter-Single Carrier-OFDM) or other SC-FDMA (In Single Carrier-Frequency Division Multiple Access, the transmission of control information (uplink or downlink control information) and reference signals (uplink reference signal or downlink reference signal) is performed simultaneously in one symbol.
  • DFT-S-OFDM Discrete Fourier Transformation-Spread-OFDM
  • Filter-SC-OFDM Filter-SC-OFDM
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • the processing module in all the foregoing embodiments of the present invention may be implemented by at least one processor, where the processor may be a central processing unit (CPU), or other general-purpose processors, digital signals.
  • the sending module can be implemented by a transmitter or a transceiver.
  • the receiving module can be implemented by a receiver or a transceiver.
  • the access network device and the user equipment in the above embodiments of the present invention may further include components such as a memory, where the memory may include a read only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory can also store information of the device type.
  • the processor calls the instruction code of the memory to control the network device in the embodiment of the present invention and other modules in the user equipment to perform the foregoing operations.
  • system and “network” are used interchangeably herein. It should be understood that the term “and/or” herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist simultaneously. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.
  • B corresponding to A means that B is associated with A, and B can be determined from A.
  • determining B from A does not mean that B is only determined based on A, and that B can also be determined based on A and/or other information.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, which may be electrical, mechanical. Or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • An integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, can be stored in a computer readable storage medium.
  • the technical solution of the present invention which is essential or contributes to the prior art, or a part of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium, including
  • the instructions are used to cause a computer device (which may be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like.
  • the medium of the program code includes: a U disk, a mobile hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a disk or an optical disk, and the like.

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Abstract

一种信号发送方法包括：发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；所述发送设备通过将所述2M个子载波上映射的序列变换到时域生成发送信号后发送。上述方法实现了所述相同的时域符号上传输的两路信号且保持低峰均比。

Description

一种信号发送或接收方法和设备 技术领域
本发明涉及通信系统领域，特别涉及一种信号发送或接收方法和装置。
背景技术
现代通信系统(例如全球移动通信(Global System for Mobile Communications,GSM)系统、码分多址接入2000(Code Division Multiple Access2000，CDMA2000)，宽带码分多址接入(Wideband Code Division Multiple Access，WCDMA)系统，以及第三代合作伙伴计划(3rd Generation Partnership Project，3GPP)长期演进(Long Term Evolution，LTE)系统)通常都工作在3GHz以下的载频上。随着智能终端特别是视频业务的出现，当前的频谱资源已经难以满足用户对容量需求的爆炸式增长。具有更大的可用带宽的高频频段特别是毫米波频段，日益成为下一代通信系统的候选频段。例如载频在3GHz-200GHz的范围内，潜在的可用带宽约为250GHz。因此，在未来通信系统中需要考虑高效的信号发送方法，例如低峰均比的发送方法，减少对发射器件的要求。
当前LTE系统中的下行信号传输通常采用正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术。OFDM技术具有强的抗多径干扰能力，离散傅里叶变换实现简单，以及有利于多天线传输技术等特点，从而得到广泛的研究和应用。上行信号传输采用离散傅里叶变换-扩展-OFDM(Discrete Fourier Transmform-Spread-OFDM，DFT-S-OFDM)方案。DFT扩展的OFDM具有与单载波信号相近的峰均比性能。当不同用户设备所占用的子载波组不重叠时，可实现正交频分复用，由此得到单载波正交频分复用方案。
在当前LTE中定义的基于DFT-S-OFDM的单载波频分复用(Single Carrier-Frequency Division Multiple Access，SC-FDMA)传输是指其进行DFT变换前的时域信号包络符合单载波特性或者有比较好的峰均比特性(或者比较好的三次度量量(cubic metric,CM)特性)，从而可以获得较低的发射信号的峰均比。在频域上，可以通过集中式或分布式两种方式实现。对于集中式SC-FDMA传输，一个UE的一种发送信号在频域上占有一个连续的频谱(即频域子载波是 连续的)，是整个系统带宽的一部分。分布式的SC-FDMA传输，一个UE的一种发送信号在频域上占有不连续的等间隔的多个子载波。一个用户设备的两个信道或者两个用户设备的两个信道可以频分复用，从而保证两个信道之间的干扰很小。而对于一个UE的多个信号或信道传输来说，为保持与单载波信号相近的峰均比性能，每个终端设备的上行控制信道和上行参考信号(如解调参考信号(Demodulation Reference Signal,DMRS))采用时分复用的方式进行传输，或每个用户的上行数据信道和上行参考信号采用时分复用的方式进行传输，即在不同时域符号上进行发送，以保持与单载波信号传输逼近的低峰均比性能。
然而，现有技术并没有一个终端设备在一个时域符号同时发送频分正交的两种信号，并能够减少因为两个信号的叠加而导致的高峰均比的技术方案。
发明内容
本发明实施例提供一种信号发送或接收方法和设备，以解决如何在相同的时域符号上同时发送频分正交的两种信号，并能够减少因为两个信号的叠加而导致的高峰均比的问题。
第一方面，本发明实施例提供了一种信号发送方法，包括：
发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；
所述发送设备通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
所述发送设备发送所述发送信号。
结合第一方面的第一种可能的实现方式，在第二种可能的实现方式中，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包 括：
所述发送设备对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换。
在第一方面的第三种可能的实现方式中，所述第一时域序列是所述第一序列经逆离散傅里叶变换IDFT得到的序列；
所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
在第一方面的第三种可能的实现方式中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第二序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述将第一序列映射到所述2M个子载波中的M个偶数号子载波，包括：所述发送设备将所述第二时域序列进行DFT得到所述第四序列，并将所述第四序列映射到所述M个偶数号子载波上。
结合第一方面的第四种可能的实现方式，在第五种可能的实现方式中，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第一时域序列和所述第二时域序列；以及
所述发送设备对所述第一时域序列进行第一联合变换得到所述第三序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换；以及将所述第二时域序列进行DFT得到所述第四序列；
其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
在第一方面的第六种可能的实现方式中，所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个编号为奇数的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素分别为所述第二时域序列的M个元素 的相反数；
所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个编号为偶数的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素分别与所述第二时域序列的M个元素相同。
结合第一方面的第六种可能的实现方式，在第七种可能的实现方式中，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第一时域序列x(k)和所述第二时域序列y(k)；
所述发送设备将所述第一时域序列x(k)和所述第二时域序列x(k)均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k),k＝0,1,...,M-1；
所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
所述发送设备将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
所述发送设备将所述第一时域序列进行2M×2M的DFT得到所述第三序列，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列进行2M×2M的DFT得到所述第四序列，并将所述第四序列映射到所述M个奇数号子载波上。
结合第一方面或第一方面的任一种可能的实现方式，在第八种可能的实现方式中，所述第三序列为所述发送设备预先确定的序列。
结合第一方面或第一方面的任一种可能的实现方式，在第九种可能的实现方式中，所述M个第一信息元素为控制信道承载的信息元素；或者
所述M个第一信息元素为数据信道承载的信息元素；或者
所述M个第一信息元素为广播信道承载的系统信息元素。
结合第一方面或第一方面的任一种可能的实现方式，在第十种可能的实现方式中，所述第一时域序列为用所述发射端预先确定序列的承载了M个第二信息元素得到的序列。
结合第一方面的第八或第十种可能的实现方式，在第十一种可能的实现方式中，所述预先确定的序列为扎道夫初ZC序列或ZC序列的循环扩充得到的序列或ZC序列截短得到的序列或者长期演进LTE系统中参考信号使用的序列对应的序列。
结合第一方面或第一方面的任一种可能的实现方式，在第十二种可能的实现方式中，所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
所述发送信号中，所述第一信号对应第一功率调整值，以及所述第二信号对应第二功率调整值。
结合第一方面或第一方面的任一种可能的实现方式，在第十三种可能的实现方式中，所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波
第二方面，本发明实施例提供了一种信号接收方法，包括：
接收设备从2M个子载波上接收信号，其中，所述2M个子载波为相同时域符号上的子载波；
所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列；
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。
在第二方面的第一种可能的实现方式中，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处 理，获取所述M个第一信息元素，包括：
所述接收设备对所述M个奇数号子载波上承载的接收到的所述第四序列进行第二联合变换得到接收到的所述第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
所述接收设备从接收到的所述第二时域序列中解调获取所述M个第一信息元素。
结合第二方面的第一种可能的实现方式，在第二种可能的实现方式中，所述第一时域序列是所述第一序列经IDFT得到的序列；
所述M个元素对应的所述第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
在第二方面的第三种可能的实现方式中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备对所述M个偶数号子载波上承载的接收到的所述第四序列进行M×M的IDFT得到接收到的所述第二时域序列；以及
所述接收设备从接收到的所述第二时域序列中解调获取所述M个第一信息元素。
结合第二方面的第三种可能的实现方式，在第四种可能的实现方式中，所述接收设备对所述信号进行FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备对所述接收到的第二序列进行第二联合变换得到所述第一时域序列，第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；以及
所述接收设备通过对所述接收到的第一时域序列解调获取所述接收到的第一时域序列承载的M个第二信息元素。
在第二方面的第五种可能的实现方式中，所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
对扩展后的接收到的第四序列进行2M×2M的IDFT得到所述接收到的第二时域序列，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数；以及
通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
结合第二方面的第五种可能的实现方式，在第六种可能的实现方式中，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备将所述接收到的第三序列通过插0扩展为长度为2M；
对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素；以及
所述接收设备通过解调所述接收到的第一时域序列获取所述第三序列携带的M个第二信息元素。
结合第二方面或第二方面的任一种可能的实现方式，在第七种可能的实现方式中，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备根据所述接收到的第三序列进行所述信道估计。
结合第二方面的第七种可能的实现方式，在第八种可能的实现方式中，所述第三序列为所述接收设备预先确定的序列。
结合第二方面的第八种可能的实现方式，在第九种可能的实现方式中，所述预先确定的序列为扎道夫初ZC序列或ZC序列的循环扩充得到的序列或ZC序列截短得到的序列或者长期演进LTE系统中的参考信号使用的序列对应的序列。
结合第二方面或第二方面的任一种可能的实现方式，在第十种可能的实现方式中，所述M个第一信息元素为控制信道承载的信息元素；或者
所述M个第一信息元素为数据信道承载的信息元素；或者
所述M个第一信息元素为广播信道承载的系统信息元素。
结合第二方面或第二方面的任一种可能的实现方式，在第十一种可能的实现方式中，所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波
第三方面，提供了一种信号发送设备，其特征在于，包括：处理模块和发送模块；其中，
所述处理模块，用于将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；
所述处理模块还用于，通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
所述发送模块，用于发送所述处理模块生成的所述发送信号。
在第三方面的第一种可能的实现方式中，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述处理模块将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换。
结合第三方面的第一种可能的实现方式，在第二种可能的实现方式中，所述第一时域序列是所述第一序列经逆离散傅里叶变换IDFT得到的序列；
所述处理模块用于按如下方式对所述第二时域序列进行第一联合变换得到所述第二序列：
将所述第二时域序列的M个元素分别进行相应的第一相位旋转，并对旋转后的第二时域序列进行M×M的DFT得到所述第二序列，
其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
在第三方面的第三种可能的实现方式中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第二序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述处理模块用于按如下方式将所述第一序列映射到所述2M个子载波中的M个偶数号子载波：将所述第二时域序列进行DFT得到所述第一序列，并将所述第一序列映射到所述M个偶数号子载波上。
结合第三方面的第三种可能的实现方式，在第四种可能的实现方式中，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于：
获取所述第一时域序列和所述第二时域序列；以及对所述第一时域序列进行第一联合变换得到所述第三序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换；以及将所述第二时域序列进行DFT得到所述第四序列；
其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
在第三方面的第五种可能的实现方式中，所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个奇数编号的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素分别为所述第二时域序列的M个元素的相反数；
所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个偶数编号的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素分别与所述第二时域序列的M个元素相同。
结合第三方面的第五种可能的实现方式，在第六种可能的实现方式中，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于，
获取所述第一时域序列x(k)和所述第二时域序列y(k)；
将所述第一时域序列x(k)和所述第二时域序列y(k)均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k)，k＝0,1,...,M-1；
所述处理模块按如下方式将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波：
将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
将所述第一时域序列进行2M×2M的DFT得到所述第三序列，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列进行2M×2M的DFT得到所述第四序列，并将所述第四序列映射到所述M个奇数号子载波上。
结合第三方面或第三方面的任一种可能的实现方式，在第七种可能的实现方式中，所述第三序列为所述设备预先确定的序列。
结合第三方面或第三方面的任一种可能的实现方式，在第八种可能的实现方式中，所述M个第一信息元素为控制信道承载的信息元素；或者
所述M个第一信息元素为数据信道承载的信息元素；或者
所述M个第一信息元素为广播信道承载的系统信息元素。
结合第三方面或第三方面的任一种可能的实现方式，在第九种可能的实现方式中，所述第一时域序列为用所述设备预先确定的序列承载了M个第二信息元素得到的序列。
结合第三方面的第七或第九种可能的实现方式，在第十种可能的实现方式中，所述预先确定的序列为的扎道夫初ZC序列或ZC序列的循环扩充得到的序列或ZC序列截短得到的序列或者长期演进LTE系统中参考信号使用的序列对应的序列。
结合第三方面或第三方面的任一种可能的实现方式，在第十一种可能的实现方式中，所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
所述发送信号中，所述第一信号对应第一功率调整值，以及所述第二信号 对应第二功率调整值。
结合第三方面或第三方面的任一种可能的实现方式，在第十二种可能的实现方式中，所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波
第四方面，本发明实施例提供了一种信号接收设备，包括：接收模块和处理模块；其中，
所述接收模块，用于从2M个子载波上接收信号，其中，所述2M个子载波为相同时域符号上的子载波；
所述处理模块用于，对所述接收模块接收的所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列；以及
所述处理模块还用于，对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。
在第四方面的第一种可能的实现方式中，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述处理模块用于按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
对所述M个奇数号子载波上承载的所述接收到的第二序列进行第二联合变换得到所述接收到的第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
结合第四方面的第一种可能的实现方式，在第二种可能的实现方式中，所述第一时域序列是所述第一序列经IDFT得到的序列；
所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
在第四方面的第三种可能的实现方式中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述处理模块按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
对所述M个偶数号子载波上承载的所述接收到的第一序列进行M×M的IDFT得到所述接收到的第二时域序列；以及
从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
结合第四方面的第三种可能的实现方式，在第四种可能的实现方式中，所述处理模块对所述信号进行FFT得到接收到的第一序列和第二序列之后，还用于：
对所述接收到的第二序列进行第二联合变换得到所述接收到的第一时域信号，第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；；以及
通过对所述接收到的第一时域序列解调获取所述接收到的第一时域序列承载的M个第二信息元素。
在第四方面的第五种可能的实现方式中，所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
对扩展后的接收到的第四序列进行2M×2M的IDFT，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数；以及
通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
结合第四方面的第五种可能的实现方式中，在第六种可能的实现方式中， 所述处理模块对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，还用于：
将所述接收到的第三序列通过插0扩展为长度为2M；
对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素；以及
通过解调所述接收到的第一时域序列获取所述接收到的第三序列携带的M个第二信息元素。
结合第四方面或第四方面的任一种可能的实现方式中，在第七种可能的实现方式中，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述设备还包括：
所述接收设备根据所述接收到的第三序列进行所述信道估计。
结合第四方面的第七种可能的实现方式中，在第八种可能的实现方式中，所述第三序列为所述设备预先确定的序列。
结合第四方面的第八种可能的实现方式中，在第九种可能的实现方式中，所述预先确定的序列为扎道夫初ZC序列或ZC序列的循环扩充得到的序列或ZC序列截短得到的序列，或者长期演进LTE系统中的参考信号使用的序列对应的序列。
结合第四方面或第四方面的任一种可能的实现方式中，在第十种可能的实现方式中，所述M个第一信息元素为控制信道承载的信息元素；或者
所述M个第一信息元素为数据信道承载的信息元素；或者
所述M个第一信息元素为广播信道承载的系统信息元素。
结合第四方面或第四方面的任一种可能的实现方式，在第十一种可能的实现方式中，所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波。
通过上述实施例，由于所述相同的时域符号上传输的两路信号对应的时域序列满足同相支路和正交支路传输的特性，也即所述相同的时域符号上传输的两路信号对应的时域序列的元素I/Q正交，因此当两路信号在相同的时域符号(如一个符号)内同时传输时，由于该两路信号叠加后的信号的幅值能够保持 低峰均比，而不会出现两路信号可能是同相，也可以能是反相，因此，该两路信号叠加后的信号不会出现由于相位的随机性而导致的高峰均比，增加的峰均比很少。同时，所述两路信号分别在2M个子载波中的M个偶数号子载波上和M个奇数号子载波上发送，所述两路信号满足频分正交的特性，在一路信号的子载波上没有另一路信号，能够容易区分出两路信号，从而接收时两路信号没有干扰或干扰很小。
附图说明
图1为本发明实施例的一种频域资源划分的示意图；
图2为本发明实施例所应用的一种帧结构示意图；
图3为本发明实施例提供的信号发送方法的流程示意图；
图4为本发明实施例广播信道承载的信息和下行数据信道承载的数据的频分复用的发送示意图；
图5为本发明实施例辅同步信号频分复用示意图；
图6a和6b为本发明实施例的第一种示例的示意图；
图7a和7b为本发明实施例的第二种示例的示意图；
图8a、8b、8c和8d为本发明实施例的第三种示例的示意图；
图9所示为本发明实施例提供的信号接收方法的流程示意图；
图10所示为本发明实施例提供的信号发送设备的结构示意图；以及
图11所示为本发明实施例提供的信号接收设备的结构示意图。
具体实施方式
现有技术中一个终端设备的上行控制信道和上行参考信号通常采用时分的方式发送。为实现终端设备在相同的时域符号(如一个时域SC-FDMA符号)内同时发送上行控制信息和上行参考信号，一种可以采用的方案是将所述时域符号内待传输的至少一个物理资源块分成互不重叠的两个载波组，两个载波组分别发送所述上行控制信息和上行参考信号。即，待传输的至少一个物理资源块被频分为两个梳齿，如图1所示，梳齿一(comb 1)用于发送上行控制信息， 梳齿二(comb 2)用作发送上行参考信号。然而，上述方案在一个时域符号上同时发送上行控制信息和上行参考信号时，由于一个时域符号的至少一个物理资源块被分成两个梳齿来同时发送上行控制信息和上行参考信号，即发送的是两种信号，虽然每一个梳齿上的SC-FDMA信号在时域上可以有比较好的峰均比特性，但是两个信号在同一个时域符号上发射，可能在一些采样点上两个信号接近同相，从而发射信号变大，在另外一些采样点上两个信号接近反相，从而发射信号变小，因此造成较高的峰均比。
本发明实施例提供了一种信号发送方法，能够实现在相同的时域符号上同时传输两种信号的同时，减少因为两个信号的叠加而导致的高峰均比。后文将时域符号简称为符号。
本发明实施例可以应用于包括接入网设备和终端设备(terminal device or terminal equipment)的通信系统中。应理解，在本发明实施例中，终端设备也可称之为终端、用户设备(user equipment)、移动台(mobile station，MS)、移动终端(mobile terminal)等。该终端设备可以经无线接入网(radio access network，RAN)与一个或多个核心网进行通信，例如，终端设备可以是移动电话(或称为蜂窝电话)、具有移动终端的计算机等，又例如，可以是便携式、袖珍式、手持式、计算机内置的或者车载的移动装置，它们与无线接入网交换语音和/或数据。接入网设备可以是基站、增强型基站、或具有调度功能的中继、或具有基站功能的设备等。其中，基站可以是LTE系统中的演进型基站(evolved Node B，eNB或e-NodeB)，也可以其他系统中的基站，本发明实施例并不限定。后续实施例以基站为例进行说明，但是并不表示本发明实施例仅限于基站。
传输信号的资源块包括时域资源和频域资源。例如，LTE系统中，时域资源可以包括OFDM或者SC-FDMA符号，频域资源可以包括子载波。当前LTE系统中，一个资源块在时域上包括14个OFDM符号或者SC-FDMA符号(本发明实施例简称为时域符号或符号)，在频域上包括12个子载波。本发明实施例中所述的时域符号可以是LTE系统中的OFDM或者SC-FDMA符号，但是并不限于此，例如还可以是其他系统中的时域上的OFDM或者SC-FDMA符号或者其他形式的时域上的单位。
本发明实施例提供的技术方案旨在实现在相同的时域符号上同时传输两种信号的同时，例如在一个时域符号上传输两种信号，并能够减少因为两个信号 的叠加而导致的高峰均比。
需要说明的是，本发明实施例中提到的两种信号可以是两种不同的信号，也可以是一个信号的两个部分，但是本发明实施例并非限定为只能是两种信号。此外，本发明实施例中所述的时域符号是传输信号的资源的时域单位，如可以是指OFDM符号，也可以是其他的时域符号。而本发明实施例中所述的相同的时域符号可以是一个符号，也可以是多个时域符号。在相同的时域符号上同时传输两种信号例如可以是，如果时域符号为1个符号，则在该1个符号上同时传输两种信号，如果时域符号为至少2个符号，则在该至少2个符号的每个符号上同时传输两种信号。
此外，本发明实施例中，发送设备用于发送信号，接收设备用于接收发送设备发送的信号。其中，发送设备可以是终端设备，也可以是接入网设备。如果发送设备是终端设备，相应的，接收设备可以是接入网设备，这种情况下，信号为上行信号。如果发送设备是接入网设备，则接收设备可以是终端设备，这种情况下，信号为下行信号。
需要说明的是，虽然本发明实施例的方法是基于同时发送上行控制信息和上行参考信号这一问题而提出的，但是本发明实施例中的两种信号并不限于是上行控制信息和上行参考信号。例如，如果信号为上行信号，则两种信号可以分别为上行参考信号和上行控制信息，或者分别为上行参考信号和上行数据信道承载的数据，还可以是两种不同的上行参考信号。如果信号为下行信号，则两种信号可以是下行参考信号和下行控制信息，或者为物理广播信道信息和主同步信道信息，或者为物理广播信道信息和辅同步信道信息，或者为主同步信道信息和辅同步信道信息，或者为主同步信道信息的两个部分，或者为辅同步信道信息的两个部分等，或者为不同终端设备的两个数据信道承载的数据，不同终端设备两个控制信道承载的控制信息，或者为不同终端设备的数据信道承载的数据和控制信道承载的控制信息，本发明实施例不再一一列举。
本发明实施例的方法可以应用于现有的帧结构系统中，也可以应用于其他帧结构系统，如高频传输系统的帧结构中，例如，可以应用于如图2所示的帧结构系统，其中，“U”表示上行子帧，“D”表示下行子帧，“GP”表示保护间隔(Guard Period)。TDD系统中，为保证高频传输的低时延需求，可设计一种如图2所示的特殊子帧的帧结构，在该特殊子帧内同时预留用于传输上行控制信息的时域 符号和用于传输下行控制信息的时域符号。图2中，所述特殊子帧的最后一个符号作为预留的上行符号用来传输上行控制信息，如下行数据信道传输的确认或非确认(Acknowledge/Non-Acknowledge，ACK/NACK)信息等。
下面结合具体实施例说明本发明实施例如何实现在相同的时域符号上发送或接收至少两种信号。
图3所示为本发明实施例提供的信号发送方法的流程示意图。该方法包括如下步骤。
步骤301，发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路(In-phase component，I路)，另一个是正交支路(Quadrature component，Q路),或者用复数表示，则一个是实部，另外一个是虚部,下同，本文中不再赘述；
步骤302，所述发送设备通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
步骤303，所述发送设备发送所述发送信号。
可选的，步骤301之前还包括：
步骤300，所述发送设备生成所述第二时域序列和所述第三序列。
其中，所述发送设备可以直接生成所述第三序列，也可以是先生成所述第一时域序列，然后再生成所述第三序列。
例如，如果所述第三序列为参考信号序列，则所述发送设备无需生成所述第一时域序列。但是，从所述第三序列对应的时域序列，即第一时域序列的角度上看，符合上述I/Q正交特性，即，所述第二时域序列与所述第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的元素一个是同相支路，另一个是正交支路。
其中，所述第三序列对应的时域序列可以通过对所述第三序列进行逆离散 傅里叶变换(inverse discrete Fouier transform,IDFT)得到。
本实施例中，第二时域序列与第一时域序列在同一时刻的元素满足除了一个复数因子(即提取一个复数公因子)外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。也即两路信号对应的时域序列满足I/Q正交特性。
其中，所述第一时域序列和所述第二时域序列可以是单独构造，也可以是第二时域序列基于所述第三序列构造，或者是第二时域序列和所述第三序列是基于相同的规则构造，例如都基于一个相同的扎道夫-初(Zadoff-Chu，ZC)序列构造的等。本发明实施例并不限定如何构造所述第二时域序列和所述第三序列。优选的用于承载了所述M个第一信息元素的序列和第三序列为具有近似恒模特性的序列或者低峰均比(或者低三次度量量)的序列。例如，不同时刻的复数因子组成的序列z(t),t＝0,1,2,…,M-1是低峰均比(或者三次度量量小)的序列，例如LTE系统中参考信号采用的序列对应的时域序列，而除z(t)之外，第一时域信号和第二时域信号满足一个是实数，一个是虚数。
可选的，如果该第三序列对应于参考信号，该第四序列可以是基于第三序列构造的，且该第四序列携带所述M个第一信息元素。例如，用于调制所述M个第一信息元素的序列可以是基于所述第三序列构造的。可选的，所述第二时域序列是基于所述第三序列承载了M个第一信息元素得到的。如，假定第三序列为a(0),a(1),...,a(M-1)，且该第三序列对应的时域序列为x(0),x(1),...,x(M-1)，所述基于第三序列承载了M个第一信息元素得到的第二时域序列可以是：x(0)×(+j或-j)×Q,x(1)×(+j或-j)×Q,...,x(M-1)×(+j或-j)×Q。其中，Q是正实数。第二时域序列的第t个元素上承载的待传输信息为+j或-j。当第一序列是第三序列时，也即第三序列映射到偶数子载波上，从第三序列a(0),a(1),...,a(M-1)到其对应的时域序列x(0),x(1),...,x(M-1)的变换可以是IDFT。另外的，第三序列在映射到M个子载波之前，还可以进行功率调整变为V*(a(0),a(1),...,a(M-1)),V是功率调整量，是一个正实数。第四序列c(0),c(1),...,c(M-1)在映射到M个子载波之前，还可以进行功率调整，即乘上一个正实常数U，为U*(c(0),c(1),...,c(M-1))，U是功率调整量。
或者，该用于承载所述M个第一信息元素的序列可以是用与第三序列相同的预定义的规则获得的序列。
当然，该用于承载所述M个第一信息元素的序列也可以独立于所述第三序列对应的时域序列。即，该用于承载所述M个第一信息元素的序列可以是用预先确定的规则获取的序列，而不是基于所述第三序列对应的时域序列构造的。
M个信息元素可以是原始信息元素经过编码或者速率匹配或者重复之后获得的M个信息元素。
本实施例中，第三序列可以表示为a(k)，k＝0,1,...,M-1。该第三序列对应的时域序列，即第一时域序列表示为x(t)＝z(t)×g(t)。所述第二时域序列可以表示为y(t)＝z(t)×Qt×h(t)。其中，t＝0,1,...,M-1，z(t)可以是一个低峰均功率比(peak-to-average power ratio，PAPR)序列的第t个元素，Qt＝j或-j。
一种实施例中，所述第一时域序列和第二时域序列中，g(t)的取值为+1×P或-1×P,P为正的幅度值(正实数)。其中，g(t)的取值为+1×P还是-1×P是根据第三序列携带的待发送信息元素决定的。这种情况下，h(t)的取值为+1×Q或-1×Q，Q为正的幅度值。同样，h(t)的取值为+1×Q还是-1×Q是根据第四序列携带的待发送信息元素决定的，即上述实施例中M个第一信息元素决定的。例如，当所述M个第一信息元素中第t个元素为1，h(t)为+1×Q；当所述M个第一信息元素中第t个元素为-1，h(t)为-1×Q。或者，当所述M个第一信息元素中第t个元素为1，h(t)为-1×Q；当所述M个第一信息元素中第t个元素为-1，h(t)为+1×Q。可以看出，如果P＝Q，则第一时域序列和第二时域序列具有相同的功率。即，所述第一信号和第二信号采用相同功率发送。而如果P≠Q，则第一时域序列和第二时域序列功率不同，即所述第一信号和第二信号采用不同功率发送，发送设备可以根据信道的不同配置不同的P和Q,从而配置不同信道的不同发射功率。例如，参考信号信道的发射功率，可能和数据信号的发射功率不同，可以有一个功率偏置量。
又一种实施例中，所述第一时域序列和第二时域序列中，g(t)的取值为+1×P×j或-1×P×j，P为正实数，其中，g(t)的取值为+1×P×j还是-1×P×j是根据第一时域序列携带的待发送信息元素决定的。这种情况下，h(t)的取值为+1×Q×j或-1×Q×j，Q为正实数，同样，h(t)的取值为+1×Q×j还是-1×Q×j是根据第二时域序列携带的待发送信息元素决定的，即上述实施例中M个第一信息元素决定的。例如，当所述M个第一信息元素中第t个元素为1，h(t)为+1×Q×j；当所述M个第一信息元素中第t个元素为-1，h(t)为-1×Q×j，或者相反。
再一种实施例中，第三序列可以表示为a(k)，k＝0,1,...,M-1。该第三序列对应的时域序列，即第一时域序列表示为x(t)＝z(t)×g(t)。所述第二时域序列可以表示为y(t)＝z(t)×g(t)×Q×h(t)。其中，t＝0,1,...,M-1，z(t)为一个低峰均功率比(peak-to-average power ratio，PAPR)序列的第t个元素，可选地，z(t)＝1或模为1的复数或复常数，Q的取值不随t的变化而变化，可以为j或-j。g(t)为二进制相移键控(binary phase shift key，BPSK)，正交相移键控(quadrature phase shift keying,QPSK)或任意正交幅度调制(quadrature amplitude modulation，QAM)调制的信号。h(t)的取值为+1×Q或-1×Q，Q为正的幅度值。本实施例中，Qt表示虚数单位，h(t)的取值为+1×Q还是-1×Q是根据第二时域序列携带的待发送信息元素决定的。因为g(t)可以是QPSK或任意QAM调制的信号，因此，传输信号采用了更高阶的调制方式，每个信号对应的信息比特数增加了，从而所述实施方式既能传输更多的信息值又同时保持较低的峰均比。
此外，所述相同时域符号上传输的两路信号由于保持了较低的峰均比，因此所述两路信号可被作为一路占用了2M个子载波的等效传输信号(这2M个子载波上的信号经过2M*2M的IDFT变换到时域上的信号，具有好的峰均比特性)。该等效传输信号与另一路占用了2M个传输信号进行梳状的频分正交的发送，可选地，另一路传输信号为基于BPSK调制的信号。每一路信号都是等间隔分布的子载波，间隔为2kHz，两路信号梳状频分复用一共占用了4M个等间隔分配的子载波，间隔为k。同样地，这种情况所述4M个子载波中的奇数子载波和偶数子载波对应的两路信号对应的时域序列仍然满足同相支路和正交支路传输的I/Q正交特性。因此具有好的峰均比特性。如果k是正偶数，可以继续把这4M个子载波的信号和另外4M个子载波的信号梳状频分复用，而保持好的峰均比特性，直到k＝0。
由于所述相同的时域符号上传输的两路信号对应的时域序列满足同相支路和正交支路传输的特性，也即所述相同的时域符号上传输的两路信号对应的时域序列的元素I/Q正交，因此当两路信号在相同的时域符号(如一个符号)内同时传输时，由于该两路信号叠加后的信号的幅值能够保持低峰均比，因此，该两路信号叠加后的信号不会出现由于相位的随机性而导致的高峰均比，增加的峰均比很少。同时，所述两路信号满足频分正交的特性，在一路信号的子载波上没有另一路信号，能够容易区分出两路信号，从而接收时两路信号没有干扰 或干扰很小。
可选的，所述2M个子载波可以是频域上等间隔分布的2M个子载波，这样可以具有好的峰均比或者三次度量量特性。
需要特别说明的是，本发明实施例中，将2M个子载波统一编号的话，第一个子载波编号为0，这样，2M个子载波的编号分别为0,1,…,2M-1。所述M个偶数号子载波为子载波0,2,4,…,2M-2，所述M个奇数号子载波为子载波1,3,5,…,2M-1。本发明所有实施例中的所述M个奇数号子载波和所述M个偶数号子载波的含义均如此。后文均以这种含义为准进行描述。
而如果将2M个子载波统一编号且第一个子载波编号为1，本发明所有实施例中的所述M个奇数号子载波应当为这种情况下的M个偶数号子载波，而所述M个偶数号子载波应当为这种情况下的M个奇数号子载波。即本发明实施例中的所述M个偶数号子载波为这种情况下的子载波1,3,5,…,2M-1，本发明实施例中的所述M个奇数号子载波为这种情况下的子载波2,4,6,…,2M。
可选的，第三序列和第四序列映射到子载波之前还可以分别进行功率调整，即第三序列的每个元素乘上一个正实常数V，第四序列的每个元素乘上一个正实常数U，而最后输出的合并后的时域信号保持好的峰均比特性。
本发明实施例中，可以将M个奇数号子载波和M个偶数号子载波看做是两把梳齿，其中，M个偶数号子载波可以看做是梳齿一，M个奇数号子载波可以看做是梳齿二。所述第三序列和所述第四序列可以分别映射到梳齿一和梳齿二，也可以分别映射到梳齿二和梳齿一。针对于不同的映射方式，可以有不同的实施例。
第一种可选实施例
所述发送设备将所述第三序列映射到所述M个偶数号子载波上，将所述第四序列映射到所述M个奇数号子载波。即第一序列和第三序列为同一序列，映射到所述M个偶数号子载波上；第二序列和第四序列为同一序列，映射到所述M个奇数号子载波上，其中，第二序列(即第四序列)对应的第二时域序列是承载了M个第一信息元素的序列，即第二序列携带了M个第一信息元素。
这样，所述发送设备将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，该实施例还包括：
所述发送设备对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换。
其中，本发明实施例中的M×M的DFT可以如下式所示：
Figure PCTCN2015088850-appb-000001
(也可以是其他的变化的定义，例如
Figure PCTCN2015088850-appb-000002
)，其中，M是任意的正整数，其中{X(n)}为变换后的频域序列，n是频域子载波的编号。本发明实施例中的M×M的IDFT可以如下式所示：
Figure PCTCN2015088850-appb-000003
其中x(n)为变换后的时域序列，n为时域序列对应的时刻值(也可以是其他的变化的定义，例如，
Figure PCTCN2015088850-appb-000004
)而X(k)为对应的频域序列，k是频域子载波编号。
而f(t)为对应的时域序列，如，对于第一时域序列，此处的f(t)为上文的x(t)，而对于第二时域序列，此处的f(t)为后文中的y(t)。而M×M的DFT变换对应了2M个子载波中所有偶数编号的子载波上的映射，因此当需要将变换后的频域序列映射到奇数号子载波上时需对所述第二时域序列进行第一相位旋转，以实现从偶数号子载波的映射频率到奇数号子载波映射频率的偏移。需要说明的是，第一相位旋转与M×M的离散傅里叶变换DFT可以同时实现，或者，所述第一联合变换可以等价于先对所述第二时域序列进行第一相位旋转，然后对旋转后的第二时域序列进行M×M的DFT。
当假定第二时域序列为y(0),y(1),...,y(M-1),而第四序列为b(0),b(1),...,b(M-1)时，所述第二序列和第二时域序列的关系可表示为：{b(i)}＝A{y(i)},i＝0,1,...,M-1。所述第一联合变换A为第一相位旋转变换B和离散傅里叶变换C的乘积，即A＝CB。
进一步地，所述第一联合变换是M个元素对应的第一相位旋转与M×M的离散傅里叶变换DFT的联合变换，其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
例如，如果先对所述第二时域序列进行第一相位旋转，然后对旋转后的第二时域序列进行M×M的DFT，所述发送设备对所述第二时域序列进行联合变换 得到所述第二序列的步骤，包括：
所述发送设备将所述第二时域序列的M个元素分别进行相应的第一相位旋转，并对旋转后的第二时域序列进行M×M的DFT得到所述第二序列，
其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
具体的，所述第二时域序列用y(t)表示，t＝0,1,...,M-1，旋转后的第二时域序列则为y(t)e-j×2tπ/2M。
这种实现方式中，如果所述第三序列携带了M个第二信息元素，则所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，该方法还包括：
所述发送设备获取所述第一时域序列和所述第二时域序列；以及
所述发送设备对所述第一时域序列进行M×M的DFT得到所述第三序列。
如果第三序列为参考信号序列，没有携带信息元素，则，所述发送设备将所述第三序列映射到所述2M个子载波中的M个偶数号子载波上即可。
第二种可选实施例
所述发送设备将所述第四序列映射到所述M个偶数号子载波上，将所述第三序列映射到所述M个奇数号子载波。即第一序列和第四序列为同一序列，映射到所述M个偶数号子载波上，第二序列和第三序列为同一序列，映射到所述M个奇数号子载波上。
这样，所述将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：所述发送设备将所述第三序列映射到所述M个奇数号子载波；
所述将第一序列映射到所述2M个子载波中的M个偶数号子载波，包括：所述发送设备将所述第二时域序列进行M×M的DFT得到所述第四序列，并将所述第四序列映射到所述M个偶数号子载波上。
这种情况下，所述发送设备不会生成所述第一时域序列，但是所述第三序列从时域的角度看，其对应的所述第一时域序列是将所述第二序列(即第三序列)经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换(inverse discrete Fourier transform，IDFT)与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。第二联合变换是第一联合变换的逆变换。
具体的，所述第一时域序列用x(t)表示，第二时域序列用y(t)表示，
Figure PCTCN2015088850-appb-000005
这样，所述第三序列a(k)经IDFT变换后的序列为x(t)e-j×2tπ/2M，对x(t)e-j×2tπ/2M进行第二相位旋转得到x(t)。
这种实现方式中，如果所述第三序列携带了M个第二信息元素，则所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第一时域序列和所述第二时域序列；以及
所述发送设备对所述第一时域序列进行第一相位旋转，对旋转后的第一时域序列进行DFT得到所述第三序列，以及将所述第二时域序列进行DFT得到所述第四序列；
其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
第一种可选实施例和第二种可选实施例中，由于根据映射到子载波是偶数号子载波，还是奇数号子载波，从而确定时域信号和频域信号的对应关系是M×M的DFT变换，还是第一线性相位旋转和M×M的DFT变换的联合变换，可以保证第一时域序列和第二时域序列的I/Q正交特性，这样，第一时域信号和第二时域信号相加的峰均比(或三次定量量)反映了最后发射的真实信号的峰均比(或者三次度量量)。
第三种可选实施例
所述发送设备将第四序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备对所述第二时域序列的扩展序列进行2M×2M的DFT。
这种实现方式中，所述第二序列为所述第四序列，所述第二时域序列的长度为M，所述第二序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个奇数编号的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素为所述第二时域序列的M个元素的相反数。因此，所述第二时域序列的扩展序列是一个反对称的序列。根据DFT的特性知道，反对称扩展的序列的DFT后的序列在偶数子载波上的值为零。 因此，第二时域序列经2M×2M的DFT后映射到M个奇数号子载波上。这种情况下，能够实现所述第三序列映射到所述M个偶数号子载波，所述第四序列映射到所述M个奇数号子载波。
这种情况下，从时域的角度上看所述第三序列的话，所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个偶数编号的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素与所述第一时域序列的M个元素相同。因此，所述第一时域序列的扩展序列是一个对称序列。根据DFT的特性知道，对称扩展的序列的DFT后的序列在奇数子载波上的值为零。第一时域序列是第三序列在频域上奇数指标插零后变成2M长的序列，经过2M×2M的IDFT得到的2M长时域序列的前M个元素。插零操作可以表示为：a1,a2,a3,..,->a1,0,a2,0,a3,0,…。
进一步地，在所述第三序列携带了M个第二信息元素或者所述发送设备直接生成的是第一时域序列而不是第三序列的情况下，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第一时域序列和所述第二时域序列；
所述发送设备将所述第一时域序列和所述第二时域序列均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k)，k＝0,1,...,M-1；
所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
所述发送设备将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
所述发送设备将所述第一时域序列扩展后的序列进行2M×2M的DFT得到所述第三序列(DFT后的2M长的序列的偶数编号的元素)，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列扩展后的序列进行2M×2M的DFT得到所述第四序列(DFT后的2M长的序列的奇数编号的元素)，并将所述第四序列映射到所述M个奇数号子载波上。
可选的，如果所述第三序列不携带信息元素，只是参考信号序列的话，所 述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第二时域序列；
所述发送设备将所述第二时域序列扩展为2M长的序列，其中，所述第二时域序列的扩展方式为y(k+M)＝-y(k)，k＝0,1,...,M-1；
进一步地，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
所述发送设备将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列的扩展序列进行2M×2M的DFT得到所述第四序列(DFT后的2M长的序列的奇数编号的元素)，并将所述第四序列映射到所述M个奇数号子载波上。
第四种可选实施例
与第三种可选实施例不同的是，本实施例中，第二时域序列的扩展序列中，后M个元素与前M个元素分别相同，相应的，从时域的角度看第三序列对应的时域序列，即第一时域序列，该第一时域序列的扩展序列中，后M个元素分别为前M个元素的相反数。
所述发送设备将第四序列映射到所述2M个子载波中的M个偶数号子载波之前，还包括：
所述发送设备对所述第二时域序列的扩展序列进行2M×2M的DFT。
这种实现方式中，所述第一序列为所述第四序列，所述第二序列为所述第三序列。所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个偶数编号的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素和所述第二时域序列的M个元素相同。
这种情况下，从时域的角度上看所述第三序列的话，所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M编号为奇数的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素与所述第一时域序列的前M个 元素相反。
进一步地，在所述第三序列携带了M个第二信息元素或者所述发送设备直接生成的是第一时域序列而不是第三序列的情况下，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第一时域序列和所述第二时域序列；
所述发送设备将所述第一时域序列和所述第二时域序列均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝-x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝y(k)，k＝0,1,...,M-1；
所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
所述发送设备将所述第一时域序列的扩展序列和所述第二时域序列的扩展序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
所述发送设备将所述第一时域序列的扩展序列进行2M×2M的DFT得到所述第三序列(即抽取DFT之后的序列的奇数编号的元素得到的序列)，将所述第三序列映射到所述M个奇数号子载波上，将所述第二时域序列的扩展序列进行2M×2M的DFT得到所述第四序列(即抽取DFT之后的序列的偶数编号的元素得到的序列)，并将所述第四序列映射到所述M个偶数号子载波上。
可选的，如果所述第三序列不携带信息元素，只是参考信号序列的话，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
所述发送设备获取所述第二时域序列；
所述发送设备将所述第二时域序列扩展为2M长的序列，其中，所述第二时域序列的扩展方式为y(k+M)＝y(k)，k＝0,1,2,3,...,M-1；
进一步地，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
所述发送设备将所述第三序列映射到所述M个奇数号子载波上，将所述第二时域序列的扩展序列进行2M×2M的DFT得到所述第四序列(即抽取DFT之 后的序列的偶数编号的元素得到的序列)，并将所述第四序列映射到所述M个偶数号子载波上。
可选实施例三和四中，第一时域信号或者第二时域信号由于有对称或者反对称的特征，因此对应的两个频域信号分别只映射在偶数子载波或者奇数子载波上，从而设备发送的两个信号是频分正交的。发射的信号还要求，第三信号和第四信号对应的第一时信号和第二时域信号，除一个复因子外，一个是I路，一个是Q路，因此两个信号相加后峰均比特性比较好，分别进行对称扩展和反对称扩展后得两个信号相加仍然保持好的峰均比特性。
进一步地，如上文中描述，本发明实施例中的两种信号可以是多种组合方式。这些组合均可以应用于上述可选实施例中。
例如，两种信号可以是参考信号和控制信道承载的控制信息的组合，也可以是参考信号和数据信道承载的数据的组合，还可以是参考信号和其他待传输信息的组合。
其中，该参考信号可以是上行参考信号，也可以是下行参考信号。
相应的，控制信息可以是上行控制信道承载的上行控制信息，如物理上行控制信道(Physical Uplink Control Channel，PUCCH)上承载的上行控制信息，或下行控制信道承载的下行控制信息，具体的如物理下行控制信道(Physical Downlink Control Channel，PDCCH)上承载的下行控制信息。
数据信道也可以是上行数据信道，如物理上行共享信道(Physical Uplink Shared Channel，PUSCH)，或者是下行数据信道，如物理下行共享信道(Physical Downlink Shared Channel，PDSCH)等。
此外，所述待传输信息也可以是广播信道承载的系统信息，如物理广播信道(physical broadcast channel，PBCH)承载的信息，或用于同步的同步信号，如主同步信号(Primary Synchronization Signal,PSS)或辅同步信号(Secondary Synchronization Signal,SSS)等。
上述第三序列对应于参考信号，所述第三序列为所述发送设备预先确定的序列。例如，该第三序列为发送设备根据预先确定的规则获取的序列。该第三序列可以映射到所述M个偶数号子载波，这种情况下，该第三序列即第一序列， 对应于上述第一种可选实施例中的第一种实现方式。该第三序列也可以映射到M个奇数号子载波上，这种情况下，该第三序列即第二序列，对应于上述第一种可选实施例中的第二种实现方式。上述第四序列则对应于数据信道承载的数据或控制信道承载的控制信息等。第二时域序列是承载了M个第一信息元素的序列，所述M个第一信息元素可以是控制信息或数据信道承载的数据。
发送设备可以根据预先确定的规则获取第三序列，该第三序列可以是现有的参考信号序列，也可以是其他具有低峰均比特性的序列，例如具有恒模特性的序列。
可选的，发送设备可以用该参考信号序列对应的时域序列承载所述M个第一信息元素的序列来获取所述第二时域序列。其中，承载可以是将所述参考信号序列对应的时域序列与相应位置的所述M个第一信息元素的序列相乘。当然，该第二时域序列也可以通过如下方式获得：所述发送设备按照预定义的规则获取一个具有低峰均比特性的序列，并用该序列相应位置的元素乘以所述M个第一信息元素中的相应位置元素,即用该序列调制所述M个第一信息元素得到所述第二时域序列。
可选的，所述第三序列还可以是携带了待发送信息的序列。这种情况下，所述第一时域序列为用预先确定的序列承载了M个第二信息元素得到的序列。
进一步地，在第二种实现方式中，两种信号的组合方式可以是如下组合方式：
所述M个第一信息元素为主同步信号，所述M个第二信息元素为辅同步信号；或者，
所述M个第一信息元素为辅同步信号，所述M个第二信息元素为主同步信号；或者，
所述M个第一信息元素为辅同步信号的第一部分，所述M个第二信息元素为所述辅同步信号的第二部分；或者，
所述M个第一信息元素为主同步信号的第一部分，所述M个第二信息元素为所述主同步信号的第二部分；或者，
所述M个第一信息元素为物理广播信道信息，所述M个第二信息元素为主同步信号；或者，
所述M个第一信息元素为物理广播信道信息，所述M个第二信息元素为辅同步信号。
需要说明的是，上述的组合方式仅仅是示例，本发明实施例并不限于此。
一种示例中，将广播信道承载的信息(如PBCH承载的信息)和下行数据信道承载的数据(如PDSCH承载的数据)进行如图4所示的频分复用，其中PBCH对应上述实施例中的同相支路x(t)，PDSCH对应上述实施例中的正交支路y(t)，从而上述两个信道同时传输时可保持较低的峰均比。
一种示例中，可以将PSS和SSS在DFT映射前进行时域复用，其中PSS和SSS分别对应上述实施例中的同相支路x(t)和正交支路y(t)，然后对同相支路x(t)和正交支路y(t)进行DFT后映射到同一符号上，从而上述两个同步信号同时传输时也可保持较低的峰均比。
一种示例中，可以将PSS或SSS分成同相支路和正交支路进行交织传输，如SSS分成相互正交独立的两路信号，即同相支路和正交支路，其中，同相支路用来传输SSS的正交分量，正交支路用来传输SSS的同相分量。两路信号分别对应了待传输时频资源的两把梳齿，如图5所示。该示例中，通过将一种信号分成同相支路和正交支路信号，并映射在两把梳齿上，通过梳齿上信号的不同，可以传输不同的信息，例如小区的标识信息；或者可实现区分不同子帧类型。如第一种信号对应第一种子帧类型，频分双工(Frequency Division Duplexing,FDD)子帧类型，而第二种信号对应第二种子帧类型，时分双工(Time Division Duplexing，TDD)子帧类型。或者，通过将一种信号分成同相支路和正交支路信号映射到相同符号上，可以区分不同的传输时刻。如，第一种信号对应第一传输时刻，第二种信号对应第二传输时刻。
可选的，本发明所有实施例中的所述预先确定的序列，例如，上文中的用于承载所述M个第一信息元素的序列，或者第一种实现方式中的第三序列，都可以是ZC(Zadoff-Chu)序列，或ZC序列的循环扩展序列，或ZC序列的截短序列，或者其它的低峰均比/三次度量量的序列。例如，可以是目前LTE系统中所使用的参考信号序列对应的时域序列，或者频域序列。
进一步地，如果所述预先确定的序列采用当前LTE中的参考信号序列，可选地，具体可以表示为如下形式：
Figure PCTCN2015088850-appb-000006
J为奇数
Figure PCTCN2015088850-appb-000007
J为偶数。
这里，J为ZC序列的长度，本实施例中，可选地，J＝M；当然J也可以不等于M；q为与J互质的整数。
当然，所述预先确定的序列也可以是其他的具有低峰均比特性的序列。
进一步地，本发明所有实施例中的所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波。优选地，所述2M个子载波是频域上连续的2M个子载波或者等间隔分布的2M个子载波。这样，所述时域符号中的剩余子载波还可以承载其他信号。即，所述2M上承载的信号还可以和其他信号通过频分复用的方式在所述相同时域符号上发送。
例如，可以将终端设备A发送的信号，如控制信息及参考信号和终端设备B发送的探测参考信号(Sounding Reference Signal，SRS)采用频分的方式复用到同一个符号上的物理资源上。对于终端设备A而言，频分复用的控制信息和参考信号对应的第一时域信号和第二时域信号是I/Q正交的，不会导致较高的峰均比。
下文通过结合附图描述上述可选实施例的几种实现方式的示例。
第一方式如图6a和6b所示。
图6a中，所述第一序列为所述第三序列，所述第二序列为所述第四序列，所述步骤301之前，本实施例还包括：
步骤300a1，所述发送设备获取所述第三序列a(k)和所述第二时域序列；
步骤300a2，所述发送设备将所述第二时域序列y(t)进行第一相位旋转，并对旋转后的第二时域序列进行DFT得到所述第四序列。
这样，在步骤301中，所述发送设备将第三序列映射到2M个子载波中的M个偶数号子载波上，将第四序列映射到所述2M个子载波中的M个奇数号子载波。
图6b中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述步骤301之前，本实施例还包括：所述发送设备获取所述第三序列a(k)和所 述第二时域序列y(t)，所述发送设备将所述第二时域序列进行DFT得到所述第四序列。
这样，在步骤301中，所述发送设备将第三序列映射到2M个子载波中的M个奇数号子载波上，将第四序列映射到所述2M个子载波中的M个偶数号子载波。
进一步地，在步骤302中，所述发送设备通过将所述2M个子载波上映射的序列变换到时域生成发送信号可以是，所述发送设备通过将所述2M个子载波上映射的序列进行IFFT生成所述发送信号。本发明实施例在生成所述发送信号时均可以按照此方式实现，后文不再赘述。
第二方式如图7a和7b所示。
图7a中，所述第一序列为所述第三序列，所述第二序列为所述第四序列，所述步骤301之前，本实施例还包括：
步骤300b1，所述发送设备获取所述第二时域序列；
需要说明的是本发明实施例中的所述第三序列可以是参考信号序列，即没有承载待发送信息，也可以是携带了所述M个第二信息元素的序列，后续实施例均如此，后文不再赘述。如果所述第三序列携带了所述M个第二信息元素的序列，则步骤300b1还获取所述第一时域序列。
此外，本发明所有实施例中，获取第一时域序列和所述第二时域序列的方式也不限定。可以参照上文描述。例如，如果所述第一时域序列不承载待发送信息，所述发送设备可以根据预先设定的规则获取预先确定的序列，即得到第三序列。如果所述第一时域序列承载了待发送信息，所述发送设备可以获取预先确定的序列，然后将待发送信息承载到该预先确定的序列从而得到第一时域序列。而该预先确定的序列可以是根据预先确定的规则获取，也可以是预先存储到所述发送设备，还可以是所述发送设备和所述接收设备事先协商好的，等等。获取第二时域序列的方式与所述第一时域序列承载了待发送信息的情况类似，此处不再赘述。
步骤300b2，所述发送设备将所述第二时域序列进行第一线性相位旋转和M*M的DFT变换的联合变换得到所述第四序列。
需要说明的是，如果步骤300b1还获取了所述第一时域序列，则本步骤中， 所述发送设备还要对所述第一时域序列进行DFT。
所述发送设备还可以是将所述第一时域序列和所述第二时域序列一起进行变换。因此，本步骤中对如何对第一时域序列和第二时域序列进行变换的顺序不做限定。
这样，在步骤301中，所述发送设备将第三序列映射到2M个子载波中的M个偶数号子载波上，将第四序列映射到所述2M个子载波中的M个奇数号子载波。
或者，图7a中，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述步骤301之前，本实施例还包括：
步骤300c1，所述发送设备获取所述第二时域序列；
所述第三序列的情况同上述实施例的描述，此处不再赘述。
步骤300c2，将所述第二时域序列进行DFT得到所述第三序列。
如果所述发送设备获取了所述第一时域序列，则本步骤还包括所述发送设备对所述第一时域序列进行第一线性相位旋转和M×M的DFT变换的联合变换得到所述第四序列，这样，在步骤301中，所述发送设备将第三序列映射到2M个子载波中的M个奇数号子载波上，将第四序列映射到所述2M个子载波中的M个偶数号子载波。
如果所述发送设备没有获取所述第一时域序列而是直接生成第三序列，则所述发送设备直接将所述第三序列映射到所述M个奇数号子载波上。这样从时域的角度看所述第三序列，则所述第三序列对应的所述第一时域序列即为所述第三序列进行第二联合变换的序列，等价于对所述第三序列先进行IDFT，然后进行上述第二相位旋转。详见上文的描述。
上述第一方式和第二方式中的DFT均为M×M长的DFT。
第三方式如图8a、8b、8c和8d所示，该方式中的DFT为2M×2M长的DFT。
图8a中，所述第一序列为所述第三序列，所述第二序列为所述第四序列，所述步骤301之前，本实施例还包括：
步骤300d1，所述发送设备获取所述第一时域序列和所述第二时域序列。
步骤300d2，所述发送设备将所述第一时域序列和所述第二时域序列均扩展为2M长的序列，其中，第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1， 所述第二时域序列的扩展方式为y(k+M)＝-y(k)，k＝0,1,...,M-1。
经过扩展后的序列可以表示为：
x(0),x(1),…,x(M-1),x(M)＝x(0),x(M+1)＝x(1),…,x(2M-1)＝x(M-1)；
y(0),y(1),…,y(M-1),y(M)＝-y(0),y(M+1)＝-y(1),…,y(2M-1)＝-y(M-1)。
可见，上述步骤300d2中，所述第一时域序列经扩展后得到以M为周期的对称序列，所述第二时域序列经扩展后得到以M为周期的反对称序列。因此，上述步骤300d2即将所述第一时域序列以M为周期重复一次，所述第二时域序列以M为周期将其M个元素的相反数重复一次。
步骤300d3，所述发送设备将所述第一时域序列和所述第二时域序列的和进行长度2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上。
即对x(i)+y(i)进行长度2M×2M的DFT，其中，i＝0,1,...,2M-1，当
Figure PCTCN2015088850-appb-000008
时，x(i)即为上文中的x(t)；y(i)即为上文中的y(t)。
当然，步骤300d3也可以是对扩展的第一时域序列和扩展的第二时域序列分别进行长度2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上
通过上述方式映射到所述2M个子载波上的序列中，所述第三序列仍然是映射到所述M个偶数号子载波上，所述第四序列映射到所述M个奇数号子载波上。
当然，如果不存在第三时域序列，则本实施例只需要对第二时域序列进行处理即可。如图8c所示，可以对第二时域序列进行如上文所述的扩展。将第三序列映射到偶数号子载波上。或者如图8d所示，可以对第二时域序列进行如上文所述的扩展。将第三序列映射到奇数号子载波上。
或者，如图8b所示，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述步骤301之前，本实施例还包括：
步骤300e2与步骤300d2类似，步骤300e3与步骤300d3类似，不同的是，本方式中对x(i)+y(i)进行长度2M×2M的DFT，其中，i＝0,1,...,2M-1，当
Figure PCTCN2015088850-appb-000009
时1，x(i)即为上文中的x(t)，y(i)即为上文中的y(t)，而且通过上述方式映射到所述2M个子载波上的序列中，所述第三序列是映射到所述M个奇数号子载波上，所述第四序列映射到所述M个偶数号子载波上。当然，如果不存在第三时域序列，则本实施例只需要对第二时域序列进行处理即可。如图8c所示，可以对第二时域序列进行如上文所述的对称扩展。将第三序列映射到奇数号子 载波上。可选的，所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
所述发送设备发送的所述发送信号中，第一信号对应第一功率调整值，所述第二信号对应第二功率调整值。
可见，本发明实施例中的第一信号和第二信号可以是通过不同的功率调整值发送。例如，如上文中，所述第三序列对应的第一时域序列中的P和第二时域序列中的Q可以相同，也可以不同。
本实施例中，不同载波集合上承载的信号可以对应于不同的功率调整值。从而可根据待传信号的特征进行灵活的功率设置以达到较优的系统性能，如。为得到较好的信道估计性能，可对参考信号设置较高的功率调整值，而待传输数据设置较低的功率调整值。而相反地，为得到较好的数据传输性能，可对待传输数据设置较高的功率调整值，而对参考信号设置较低的功率调整值。
图9所示为本发明实施例提供的信号接收方法的流程示意图。需要说明的是，该方法可以作为单独实施例使用，也可以和上述信号发送方法一起使用。且与上述实施例相同的内容可以参照上述实施例中的描述，后续不再赘述。本实施例包括如下步骤。
步骤901，接收设备从2M个子载波上接收信号，其中，所述2M个子载波为相同时域符号上的子载波；
步骤902，所述接收设备对所述信号进行快速傅里叶变换(fast Fourier transformation，FFT)得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列
步骤903，所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个 是正交支路。
接收机的信号处理可以利用上述的I/Q正交特性，对应于具体的发送方式，可以有相应的接收方式。例如在一个时刻第二时域序列是正交支路，则接收机可以只获取接收到的第二时域序列的正交支路进行信号处理，获取M个第一信息元素。一般的，接收机根据发射的信号在一个时刻除了一个复因子外是I路，(或者Q路)的特性，可以在接收方去掉复因子，获取信号中的I路(或者Q路)。
本实施例中，所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理可以是基于信道估计的结果进行信号处理。其中，如果所述第三序列为参考信号序列，则所述信道估计的结果可以是基于所述第三序列进行信道估计得到的结果。如果所述第三序列不是参考信号序列，则所述信道估计的结果可以是基于其他信号进行信道估计得到的。例如，可以是基于公共参考信号进行信道估计得到的。
其中，接收设备的步骤中，相同的内容可以参照上述实施例的描述，后续不再赘述。
同上述实施例所述，由于所述相同的时域符号上传输的两路信号对应的时域序列满足同相支路和正交支路传输的特性，也即所述相同的时域符号上传输的两路信号对应的时域序列的元素I/Q正交，因此当两路信号在相同的时域符号(如一个符号)内同时传输时，由于该两路信号叠加后的信号的幅值能够保持低峰均比，因此，该两路信号叠加后的信号不会出现由于相位的随机性而导致的高峰均比，增加的峰均比很少。同时，所述两路信号满足频分正交的特性，在一路信号的子载波上没有另一路信号，能够容易区分出两路信号，从而接收时两路信号没有干扰或干扰很小。
针对上述不同的可选实施例，接收设备的处理有所不同。
对应的于上述第一可选的实施例：
所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备对所述M个奇数号子载波上承载的接收到的所述第四序列进 行第二联合变换得到所述接收到的第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
所述接收设备从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
其中，所述第一时域序列是所述第三序列经IDFT得到的序列。需要说明的是，所述第一时域序列并非一定需要对所述第三序列进行变换得到，而是站在时域的角度看所述第三序列的话，第三序列具有该特性。例如，如果第三序列是RS序列，则不需要将RS序列进行IDFT处理。而如果所述第三序列也携带了信息元素，则所述接收设备可以对所述接收到的第三序列进行IDFT得到所述接收到的第一时域序列。
所述对所述接收到的第四序列进行第二联合变换得到所述接收到的第二时域序列，包括：
所述接收设备对所述接收到的第四序列进行M×M的逆离散傅里叶变换IDFT与M个元素的第二相位旋转的联合变换得到所述接收到的第二时域序列，其中，
其中，所述M个元素对应的相位分别为ej×2tπ/2M，t＝0,1,...,M-1。等价于进行M×M的IDFT，并对IDFT后的序列的M个元素分别进行相应的第二相位旋转。
对应的上述第二可选的实施例：
所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
同样的，所述第一时域序列并非一定需要对所述第三序列进行变换得到，而是站在时域的角度看所述第三序列的话，第三序列具有该特性。
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备对所述M个偶数号子载波上承载的接收到的所述第四序列进行M×M的IDFT得到接收到的所述第二时域序列；以及
所述接收设备从接收到的所述第二时域序列中解调获取所述M个第一信息 元素。
进一步地，如果所述第三序列携带信息元素，所述接收设备对所述信号进行FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备对接收到的所述第二序列进行M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换得到接收到的所述第一时域序列；以及
所述接收设备通过对接收到的所述第一时域序列解调获取所述第一时域序列承载的M个第二信息元素。
对应的于上述第三可选的实施例：
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备对接收到的第四序列进行信道均衡；
所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
所述接收设备对扩展后的接收到的第四序列进行2M×2M的IDFT得到接收到的所述第二时域序列，其中，所述第二时域序列为所述2M×2M的IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数，因此取IDFT后得到的序列的前M个元素得到接收到的第二时域序列；以及
所述接收设备通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
进一步地，如果所述第三序列也携带了信息元素，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备对接收到的第三序列进行信道均衡；
所述接收设备将所述接收到的第三序列通过插0扩展为长度为2M的序列；
对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列前M个元素或后M个元素；以及
所述接收设备通过解调所述接收到的第一时域序列获取所述第三序列携带的M个第二信息元素。
对应的于上述第四可选的实施例：
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备将所述第四序列通过插0扩展为长度为2M；
所述接收设备对扩展后的第四序列进行2M×2M的IDFT得到所述第二时域序列，其中，所述第二时域序列为所述2M×2M的IDFT后的序列的前M个元素或后M个元素；以及
所述接收设备通过解调所述第二时域序列获取所述M个第一信息元素。
进一步地，如果所述第三序列也携带了信息元素，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
所述接收设备将所述第三序列通过插0扩展为长度为2M；
对扩展后的第三序列进行2M×2M的IDFT，其中，所述第一时域序列为所述IDFT后的序列前M个元素或为所述IDFT后的序列的后M个元素的相反数；以及
所述接收设备通过解调所述第一时域序列获取所述第三序列携带的M个第二信息元素。
下面通过一个具体的应用示例来进一步说明本发明实施例的技术方案。
本示例中，两个信号分别为上行参考信号和待传输的上行控制信息。其中，待传输的上行控制信道包括M个信息元素，发送设备为终端设备，接收设备为接入网设备。其中，第一序列为第三序列且对应于上行参考信号，第二序列为第四序列且对应于上行控制信息。
本示例中，所述上行控制信息和所述上行参考信号占用1个时域符号上的2M个子载波。所述上行控制信息占用2M个子载波中的M个奇数号子载波(例如，第1、3、5、7……号子载波)，上行参考信号占用2M个子载波中的M个偶数号子载波(例如，第0、2、4、6……号子载波)。当然，待传输的上行控制信息也可以是占用2M个子载波中的M个偶数号子载波，上行参考信号占用2M个子载波中的M个奇数号子载波。本示例中以前一种方式为例进行说明。
所述第一序列的元素可以根据预先设定的规则获得，例如，可以是扎道夫初序列(Zadoff-Chu sequence，ZC sequence)，或者可以是ZC序列的循环扩充序列，或者可以是ZC序列的截短序列，或者是长期演进LTE系统中参考信号使用的序列对应的序列，例如对应的时域序列，或者频域序列。
本示例中，上行参考信号对应的第一序列是预先定义的。所述第二序列对应的第二时域序列是基于所述第一序列构造的，其中所述第二时域序列携带所述M个信息元素的调制相位信息，且所述第一序列对应的时域信号为同相支路，所述第二时域序列对应的信号是正交支路。例如，第二序列对应的时域信号和第一序列对应的时域信号相差一个正负虚数单位。
所述终端设备获取该预先定义的所述第一序列，用所述第一序列对应的时域序列承载所述M个信息元素得到第二时域序列。例如，所述终端设备获取的所述第一序列表示为a(k)，k＝0,1,…,M-1,该第一序列对应的第一时域序列表示为x(t)，t＝0,1,…,M-1，该x(t)可以表示为x(t)＝z(t)×g(t)。第二时域序列可以表示为y(t)＝z(t)×Qt×h(t)。Qt＝j或-j，其中，Qt为j还是-j与所述M个信息元素中的的第t个信息元素有关，例如，如果第t个待发送信息元素为1，Qt可以为j，如果第t个待发送信息元素为-1，Qt可以为-j，或者相反。这样，第一时域序列和第二时域序列的同一时刻的元素满足除了一个复数公因子z(t)外分别对应基带信号中的同相支路和正交支路的特征。
所述终端设备在获取第一序列第二时域序列后，对所述第二时域序列进行第一联合变换，例如可以经第一线性相位旋转得到旋转后的第二时域序列，对旋转后的第二时域序列进行DFT得到第二序列，然后将该第二序列映射到所述M个奇数号子载波，并将所述第一序列映射到所述M个偶数号子载波。
其中，第二时域序列中的M个元素y(t)对应的第一线性相位分别为e-j×2tπ/2M，t＝0,1,...,M-1。因此，第一时域序列和第二时域序列的同一时刻的元素同样满足除了一个复数公因子z(t)外分别对应基带信号中的同相支路(实数部分)和正交支路(虚数部分)特征。由于根据映射到子载波是偶数号子载波，还是奇数号子载波，从而确定时域信号和频域信号的对应关系是M×M的DFT变换，还是第一线性相位旋转和M×M的DFT变换的联合变换，可以保证第一时域序列和第二时域序列的I/Q正交特性，这样，第一时域信号和第二时域信号相加的峰均比(或三次定量量)反映了最后发射的真实信号的峰均比(或者三次度量量)。
因此，所述第一时域序列和所述第二时域序列的同一时刻的元素满足提取一个复数公因子后，分别对应基带信号中的同相支路和正交支路的特征。即，所述第一时域序列x(t)和所述第二时域序列y(t)提取一个公因子后，其中一个是基带信号的同相支路，一个是基带信号的正交支路。该公因子为一个复数因子，特殊情形下，该复数因子可以为一个常数。例如，本示例中g(t)和h(t)的取值为+1或-1，这样，第一时域序列提取公因子后对应的部分为同相支路，第二时域序列提取公因子后对应的部分为正交支路。
由于在所述M个偶数号子载波上的序列x(t)是已知的循环扩展的ZC序列，因此可基于对该已知序列进行信道估计，并通过某种信道插值算法得到M个奇数号子载波上所有子载波上的信道估计值。可选地，所述插值算法可以是线性内插或线性外插等典型常用的插值算法。再基于上述估计的第二个子载波组中的M个子载波上的信道值和第二序列y(k)对所述调制相位值进行检测。从而得到所述M个奇数号子载波中每个子载波所携带的调制相位值。
图10所示为本发明实施例提供的信号发送设备的结构示意图。需要说明的是，该设备可以用于执行上述实施例中的方法，因此，与上述实施例相同的内容可以参照上述实施例中的描述，后续不再赘述。
本实施例中的设备可以包括处理模块和发送模块。当然，该设备还可以包括存储模块和接收模块等。存储模块例如可以存储预先确定的序列，还可以存储预先确定的规则等。
所述处理模块，用于将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；
所述处理模块还用于，通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
所述发送模块，用于发送所述处理模块生成的所述发送信号。
同上述实施例所述，由于所述相同的时域符号上传输的两路信号对应的时域序列满足同相支路和正交支路传输的特性，也即所述相同的时域符号上传输的两路信号对应的时域序列正交，因此当两路信号在相同的时域符号(如一个符号)内同时传输时，由于该两路信号叠加后的信号的幅值能够保持低峰均比，因此，该两路信号叠加后的信号不会出现由于相位的随机性而导致的高峰均比，增加的峰均比很少。同时，所述两路信号满足频分正交的特性，在一路信号的子载波上没有另一路信号，能够容易区分出两路信号，从而接收时两路信号没有干扰或干扰很小。
对应于上述第一可选的实施例：
所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述处理模块将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是M个元素的第一线性相位旋转和DFT变换的联合变换。
进一步地，所述第一联合变换是M个元素对应的第一相位旋转与M×M的离散傅里叶变换DFT的联合变换，其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
进一步地，所述第一时域序列是所述第一序列经逆离散傅里叶变换IDFT得到的序列；
所述处理模块用于按如下方式对所述第二时域序列进行第一联合变换得到所述第二序列：
将所述第二时域序列的M个元素分别进行相应的第一相位旋转，并对旋转后的第二时域序列进行M×M的DFT得到所述第二序列，
其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
对应于上述第二可选的实施例：
所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第二序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述处理模块用于按如下方式将所述第一序列映射到所述2M个子载波中的M个偶数号子载波：将所述第二时域序列进行DFT得到所述第一序列，并将所述第一序列映射到所述M个偶数号子载波上。
进一步地，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于：
获取所述第一时域序列和所述第二时域序列；以及
对所述第一时域序列进行第一相位旋转，对旋转后的第一时域序列进行DFT得到所述第三序列，以及将所述第二时域序列进行DFT得到所述第四序列；
其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
所述处理模块获取所述第一时域序列和所述第二时域序列的方法可以参照上文的描述，此处不再赘述。
对应于上述第三可选的实施例：
所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个奇数编号的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素分别为所述第二时域序列的M个元素的相反数；
所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个偶数编号的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素分别与所述第二时域序列的M个元素相同。
进一步地，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于，
获取所述第一时域序列x(k)和所述第二时域序列y(k)；
将所述第一时域序列x(k)和所述第二时域序列y(k)均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k),k＝0,1,...,M-1；
所述处理模块按如下方式将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波：
将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
将所述第一时域序列进行2M×2M的DFT得到所述第三序列，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列进行2M×2M的DFT得到所述第四序列，并将所述第四序列映射到所述M个奇数号子载波上。
对应于上述可选的第四实施例：
与第三实施例不同的是，第一时域序列和第二时域序列的扩展方式正好与所述第三实施例的方式相反。
进一步地，所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
所述发送模块按如下方式发送所述发送信号：
发送所述第一信号与第一功率调整值的乘积信号以及所述第二信号与第二功率调整值的乘积信号。
进一步地，所述2M个子载波可以是整个带宽上全部子载波，还可以是整个带宽上的部分子载波
需要说明的是，本实施例中的信号发送设备对于上行信号可以是终端设备，还可以是终端设备中的处理器。对于下行信号可以是接入网设备，还可以是接入网设备中的处理器。
图11所示为本发明实施例提供的信号接收设备的结构示意图。需要说明的是，该设备可以用于执行上述实施例中的方法，因此，与上述实施例相同的内容可以参照上述实施例中的描述，后续不再赘述。
本实施例中的设备可以包括处理模块和接收模块。当然，该设备还可以包括存储模块和发送模块等。存储模块例如可以存储预先确定的序列，还可以存储预先确定的规则等。
所述接收模块，用于从2M个子载波上接收信号，其中，所述2M个子载波 为相同时域符号上的子载波；
所述处理模块用于，对所述接收模块接收的所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列；以及
所述处理模块还用于，对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。
同上述实施例所述，由于所述相同的时域符号上传输的两路信号对应的时域序列满足同相支路和正交支路传输的特性，也即所述相同的时域符号上传输的两路信号对应的时域序列正交，因此当两路信号在相同的时域符号(如一个符号)内同时传输时，由于该两路信号叠加后的信号的幅值能够保持低峰均比，因此，该两路信号叠加后的信号不会出现由于相位的随机性而导致的高峰均比，增加的峰均比很少。同时，所述两路信号满足频分正交的特性，在一路信号的子载波上没有另一路信号，能够容易区分出两路信号，从而接收时两路信号没有干扰或干扰很小。
对应于上述第一可选的实施例：
所述第一序列为所述第三序列，所述第二序列为所述第四序列；
所述处理模块用于按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
对所述M个奇数号子载波上承载的所述接收到的第二序列进行第二联合变换得到所述接收到的第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
进一步地，所述第一时域序列是所述第一序列经IDFT得到的序列；
所述处理模块按如下方式对所述接收到的第二序列进行第二联合变换得到所述接收到的第二时域序列：
对所述接收到的第二序列进行M×M的IDFT，并对IDFT后的序列的M个元素分别进行相应的第二相位旋转得到所述接收到的第二时域序列，其中，
其中，所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
对应于上述第二可选的实施例：
所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
所述处理模块按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
对所述M个偶数号子载波上承载的所述接收到的第一序列进行M×M的IDFT得到所述接收到的第二时域序列；以及
从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
进一步地，所述处理模块对所述信号进行FFT得到接收到的第一序列和第二序列之后，还用于：
对所述接收到的第二序列进行M×M的IDFT，并对IDFT得到的M个元素分别进行所述第二相位旋转得到所述接收到的第一时域序列(或者对接收到的第二序列进行第二联合变换得到接收到的所述第一时域序列)；以及
通过对所述接收到的第一时域序列解调获取所述第一时域序列承载的M个第二信息元素。
对应于上述第三可选的实施例：
所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
对扩展后的接收到的第四序列进行2M×2M的IDFT，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后 M个元素的相反数；以及
通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
进一步地，所述处理模块对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，还用于：
将所述接收到的第三序列通过插0扩展为长度为2M；
对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素；以及
通过解调所述接收到的第一时域序列获取所述接收到的第三序列携带的M个第二信息元素。
对应于上述第四可选的实施例：
与上述第三可选的实施例不同的是，与第三实施例不同的是，第一时域序列和第二时域序列的扩展方式正好与所述第三实施例的方式相反。
即对扩展后的接收到的第四序列进行2M×2M的IDFT，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素。
进一步地，对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数。
需要说明的是，本实施例中的信号接收设备对于上行信号可以是接入网设备，还可以是接入网设备中的处理器。对于下行信号可以是终端设备，还可以是终端设备中的处理器。
本发明实施例可以应用在单载波多址方式的技术，如DFT-S-OFDM(Discrete Fourier Transformation-Spread-OFDM)或Filter-SC-OFDM(Filter-Single Carrier-OFDM)或其他SC-FDMA(Single Carrier-Frequency Division Multiple Access)中，一个符号内同时进行控制信息(上行或下行控制信息)和参考信号(上行参考信号或下行参考信号)的传输。
需要说明的是，本发明上述所有实施例中的处理模块可以由至少一个处理器实现，这里处理器可以是一个中央处理器(central processing unit，CPU)，还可以是其他通用处理器、数字信号处理器(digital singal processor，DSP)、专用集成电路(application-specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件等。发送模块可以由发送器实现，也可以是收发器实现。接收模块可以由接收器实现，也可以是收发器实现。此外，本发明上述实施例中的接入网设备和用户设备还可以包括存储器等部件，这里存储器可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。处理器调用存储器的指令代码，控制本发明实施例中的网络设备和用户设备中的其他模块执行上述操作。
应理解，说明书通篇中提到的“一个实施例”或“一实施例”意味着与实施例有关的特定特征、结构或特性包括在本发明的至少一个实施例中。因此，在整个说明书各处出现的“在一个实施例中”或“在一实施例中”未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。
在本发明的各种实施例中，应理解，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本发明实施例的实施过程构成任何限定。
另外，本文中术语“系统”和“网络”在本文中常可互换使用。应理解，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请所提供的实施例中，应理解，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地 描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
在本申请所提供的几个实施例中，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，简称为ROM)、随机存取存储器(Random Access Memory，简称为RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (40)

  1. 一种信号发送方法，其特征在于，包括：
    发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；
    所述发送设备通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
    所述发送设备发送所述发送信号。
  2. 根据权利要求1所述的方法，其特征在于，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
    所述将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
    所述发送设备对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换。
  3. 根据权利要求2所述的方法，其特征在于，所述第一时域序列是所述第一序列经逆离散傅里叶变换IDFT得到的序列；
    所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
  4. 根据权利要求1所述的方法，其特征在于，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第二序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
    所述将第一序列映射到所述2M个子载波中的M个偶数号子载波，包括：所述发送设备将所述第二时域序列进行DFT得到所述第四序列，并将所述第四序列映射到所述M个偶数号子载波上。
  5. 根据权利要求4所述的方法，其特征在于，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
    所述发送设备获取所述第一时域序列和所述第二时域序列；以及
    所述发送设备对所述第一时域序列进行第一联合变换得到所述第三序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换；以及将所述第二时域序列进行DFT得到所述第四序列；
    其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
  6. 根据权利要求1所述的方法，其特征在于，
    所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个编号为奇数的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素分别为所述第二时域序列的M个元素的相反数；
    所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个编号为偶数的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素分别与所述第二时域序列的M个元素相同。
  7. 根据权利要求6所述的方法，其特征在于，所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还包括：
    所述发送设备获取所述第一时域序列x(k)和所述第二时域序列y(k)；
    所述发送设备将所述第一时域序列x(k)和所述第二时域序列x(k)均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k),k＝0,1,...,M-1；
    所述发送设备将第一序列映射到2M个子载波中的M个偶数号子载波上，将 第二序列映射到所述2M个子载波中的M个奇数号子载波，包括：
    所述发送设备将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
    所述发送设备将所述第一时域序列进行2M×2M的DFT得到所述第三序列，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列进行2M×2M的DFT得到所述第四序列，并将所述第四序列映射到所述M个奇数号子载波上。
  8. 根据权利要求1至6中任一项所述的方法，其特征在于，
    所述第三序列为所述发送设备预先确定的序列。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，
    所述M个第一信息元素为控制信道承载的信息元素；或者
    所述M个第一信息元素为数据信道承载的信息元素；或者
    所述M个第一信息元素为广播信道承载的系统信息元素。
  10. 根据权利要求1至9中任一项所述的方法，其特征在于，
    所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
    所述发送信号中，所述第一信号对应第一功率调整值，以及所述第二信号对应第二功率调整值。
  11. 一种信号接收方法，其特征在于，包括：
    接收设备从2M个子载波上接收信号，其中，所述2M个子载波为相同时域符号上的子载波；
    所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列；
    所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处 理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。
  12. 根据权利要求11所述的方法，其特征在于，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
    所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
    所述接收设备对所述M个奇数号子载波上承载的接收到的所述第四序列进行第二联合变换得到接收到的所述第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
    所述接收设备从接收到的所述第二时域序列中解调获取所述M个第一信息元素。
  13. 根据权利要求12所述的方法，其特征在于，所述第一时域序列是所述第一序列经IDFT得到的序列；
    所述M个元素对应的所述第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
  14. 根据权利要求11所述的方法，其特征在于，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
    所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
    所述接收设备对所述M个偶数号子载波上承载的接收到的所述第四序列进行M×M的IDFT得到接收到的所述第二时域序列；以及
    所述接收设备从接收到的所述第二时域序列中解调获取所述M个第一信息元素。
  15. 根据权利要求14所述的方法，其特征在于，所述接收设备对所述信号进行FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
    所述接收设备对所述接收到的第二序列进行第二联合变换得到所述第一时域序列，第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；以及
    所述接收设备通过对所述接收到的第一时域序列解调获取所述接收到的第一时域序列承载的M个第二信息元素。
  16. 根据权利要求11所述的方法，其特征在于，
    所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
    所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
    对扩展后的接收到的第四序列进行2M×2M的IDFT得到所述接收到的第二时域序列，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数；以及
    通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
  17. 根据权利要求16所述的方法，其特征在于，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
    所述接收设备将所述接收到的第三序列通过插0扩展为长度为2M；
    对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素；以及
    所述接收设备通过解调所述接收到的第一时域序列获取所述第三序列携带的M个第二信息元素。
  18. 根据权利要求11至14以及16中任一项所述的方法，其特征在于，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，所述方法还包括：
    所述接收设备根据所述接收到的第三序列进行所述信道估计。
  19. 根据权利要求11至14中任一项或16或18所述的方法，其特征在于，
    所述第三序列为所述接收设备预先确定的序列。
  20. 根据权利要求11至19中任一项所述的方法，其特征在于，
    所述M个第一信息元素为控制信道承载的信息元素；或者
    所述M个第一信息元素为数据信道承载的信息元素；或者
    所述M个第一信息元素为广播信道承载的系统信息元素。
  21. 一种信号发送设备，其特征在于，包括：处理模块和发送模块；其中，
    所述处理模块，用于将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波，其中，所述第一序列为第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述2M个子载波为相同时域符号上的子载波，所述第四序列是携带了M个第一信息元素的序列，以及，所述第四序列对应的第二时域序列与所述第三序列对应的第一时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路；
    所述处理模块还用于，通过将所述2M个子载波上映射的序列变换到时域生成发送信号；以及
    所述发送模块，用于发送所述处理模块生成的所述发送信号。
  22. 根据权利要求21所述的设备，其特征在于，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
    所述处理模块将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于对所述第二时域序列进行第一联合变换得到所述第二序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换。
  23. 根据权利要求22所述的设备，其特征在于，所述第一时域序列是所述第一序列经逆离散傅里叶变换IDFT得到的序列；
    所述处理模块用于按如下方式对所述第二时域序列进行第一联合变换得到所述第二序列：
    将所述第二时域序列的M个元素分别进行相应的第一相位旋转，并对旋转后的第二时域序列进行M×M的DFT得到所述第二序列，
    其中，所述M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
  24. 根据权利要求21所述的设备，其特征在于，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第二序列经第二联合变换得到的序列，所述第二联合变换为M×M的逆离散傅里叶变换IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
    所述处理模块用于按如下方式将所述第一序列映射到所述2M个子载波中的M个偶数号子载波：将所述第二时域序列进行DFT得到所述第一序列，并将所述第一序列映射到所述M个偶数号子载波上。
  25. 根据权利要求24所述的设备，其特征在于，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波之前，还用于：
    获取所述第一时域序列和所述第二时域序列；以及对所述第一时域序列进行第一联合变换得到所述第三序列，其中，所述第一联合变换是第一相位旋转与M×M的离散傅里叶变换DFT的联合变换；以及将所述第二时域序列进行DFT得到所述第四序列；
    其中，所述第一时域序列的M个元素对应的第一相位旋转分别为e-j×2tπ/2M，t＝0,1,...,M-1。
  26. 根据权利要求21所述的设备，其特征在于，
    所述第二时域序列的长度为M，所述第四序列是对所述第二时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个奇数编号的元素，所述第二时域序列的扩展序列的长度为2M，所述第二时域序列的扩展序列的后M个元素分别为所述第二时域序列的M个元素的相反数；
    所述第一时域序列的长度为M，所述第三序列是对所述第一时域序列的扩展序列进行2M×2M的DFT得到的序列中的M个偶数编号的元素，所述第一时域序列的扩展序列的长度为2M，所述第一时域序列的扩展序列的后M个元素分别与所述第二时域序列的M个元素相同。
  27. 根据权利要求26所述的设备，其特征在于，所述处理模块将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个 子载波中的M个奇数号子载波之前，还用于，
    获取所述第一时域序列x(k)和所述第二时域序列y(k)；
    将所述第一时域序列x(k)和所述第二时域序列y(k)均扩展为2M长的序列，其中，所述第一时域序列的扩展方式为x(k+M)＝x(k)，k＝0,1,...,M-1，所述第二时域序列的扩展方式为y(k+M)＝-y(k)，k＝0,1,...,M-1；
    所述处理模块按如下方式将第一序列映射到2M个子载波中的M个偶数号子载波上，将第二序列映射到所述2M个子载波中的M个奇数号子载波：
    将所述第一时域序列和所述第二时域序列的和进行2M×2M的DFT，并将DFT后的序列映射到所述2M个子载波上；或者
    将所述第一时域序列进行2M×2M的DFT得到所述第三序列，将所述第三序列映射到所述M个偶数号子载波上，将所述第二时域序列进行2M×2M的DFT得到所述第四序列，并将所述第四序列映射到所述M个奇数号子载波上。
  28. 根据权利要求21至27中任一项所述的设备，其特征在于，
    所述第三序列为所述设备预先确定的序列。
  29. 根据权利要求21至28中任一项所述的设备，其特征在于，
    所述M个第一信息元素为控制信道承载的信息元素；或者
    所述M个第一信息元素为数据信道承载的信息元素；或者
    所述M个第一信息元素为广播信道承载的系统信息元素。
  30. 根据权利要求21至29中任一项所述的设备，其特征在于，
    所述发送信号包括第一信号和第二信号，其中，所述M个偶数号子载波上对应的信号为所述第一信号，所述M个奇数号子载波上对应的信号为所述第二信号；
    所述发送信号中，所述第一信号对应第一功率调整值，以及所述第二信号对应第二功率调整值。
  31. 一种信号接收设备，其特征在于，包括：接收模块和处理模块；其中，
    所述接收模块，用于从2M个子载波上接收信号，其中，所述2M个子载波为相同时域符号上的子载波；
    所述处理模块用于，对所述接收模块接收的所述信号进行快速傅里叶变换 FFT得到接收到的第一序列和第二序列，其中，所述第一序列承载在所述2M个子载波中的M个偶数号子载波上，所述第二序列承载在所述2M个子载波中的M个奇数号子载波上,所述第一序列为所述第三序列和第四序列中的一个，所述第二序列为所述第三序列和所述第四序列中的另一个，所述第四序列是携带了M个第一信息元素的序列；以及
    所述处理模块还用于，对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，其中，所述第三序列对应的第一时域序列和所述第四序列对应的第二时域序列在同一时刻的元素满足除了一个复数因子外所述第一时域序列和所述第二时域序列中的一个是同相支路，另一个是正交支路。
  32. 根据权利要求31所述的设备，其特征在于，所述第一序列为所述第三序列，所述第二序列为所述第四序列；
    所述处理模块用于按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
    对所述M个奇数号子载波上承载的所述接收到的第二序列进行第二联合变换得到所述接收到的第二时域序列，其中，所述第二联合变换是逆离散傅里叶变换IDFT与第二相位旋转的联合变换；以及
    从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
  33. 根据权利要求32所述的设备，其特征在于，所述第一时域序列是所述第一序列经IDFT得到的序列；
    所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1。
  34. 根据权利要求31所述的设备，其特征在于，所述第一序列为所述第四序列，所述第二序列为所述第三序列，所述第一时域序列是所述第三序列经第二联合变换得到的序列，所述第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述第一时域序列的所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；
    所述处理模块按如下方式对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素：
    对所述M个偶数号子载波上承载的所述接收到的第一序列进行M×M的IDFT得到所述接收到的第二时域序列；以及
    从所述接收到的第二时域序列中解调获取所述M个第一信息元素。
  35. 根据权利要求34所述的设备，其特征在于，所述处理模块对所述信号进行FFT得到接收到的第一序列和第二序列之后，还用于：
    对所述接收到的第二序列进行第二联合变换得到所述接收到的第一时域信号，第二联合变换为M×M的IDFT与第二相位旋转的联合变换，所述M个元素对应的第二相位旋转分别为ej×2tπ/2M，t＝0,1,...,M-1；；以及
    通过对所述接收到的第一时域序列解调获取所述接收到的第一时域序列承载的M个第二信息元素。
  36. 根据权利要求31所述的设备，其特征在于，
    所述接收设备对承载所述第四序列的M个子载波上的接收信号进行信号处理，获取所述M个第一信息元素，包括：
    所述接收设备将所述接收到的第四序列通过插0扩展为长度为2M；
    对扩展后的接收到的第四序列进行2M×2M的IDFT，其中，所述接收到的第二时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素的相反数；以及
    通过解调所述接收到的第二时域序列获取所述M个第一信息元素。
  37. 根据权利要求36所述的设备，其特征在于，所述处理模块对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二序列之后，还用于：
    将所述接收到的第三序列通过插0扩展为长度为2M；
    对扩展后的接收到的第三序列进行2M×2M的IDFT，其中，所述接收到的第一时域序列为所述IDFT后的序列的前M个元素或为所述IDFT后的序列的后M个元素；以及
    通过解调所述接收到的第一时域序列获取所述接收到的第三序列携带的M个第二信息元素。
  38. 根据权利要求31至34以及36中任一项所述的设备，其特征在于，所述接收设备对所述信号进行快速傅里叶变换FFT得到接收到的第一序列和第二 序列之后，所述设备还包括：
    所述接收设备根据所述接收到的第三序列进行所述信道估计。
  39. 根据权利要求1至34以及36和38中任一项所述的设备，其特征在于，
    所述第三序列为所述设备预先确定的序列。
  40. 根据权利要求31至39中任一项所述的设备，其特征在于，
    所述M个第一信息元素为控制信道承载的信息元素；或者
    所述M个第一信息元素为数据信道承载的信息元素；或者
    所述M个第一信息元素为广播信道承载的系统信息元素。
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