WO2017054632A1 - 信号发送方法、信号接收方法、发射端及接收端 - Google Patents

信号发送方法、信号接收方法、发射端及接收端 Download PDF

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Publication number
WO2017054632A1
WO2017054632A1 PCT/CN2016/098476 CN2016098476W WO2017054632A1 WO 2017054632 A1 WO2017054632 A1 WO 2017054632A1 CN 2016098476 W CN2016098476 W CN 2016098476W WO 2017054632 A1 WO2017054632 A1 WO 2017054632A1
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Prior art keywords
signal
mixed carrier
carrier signal
fourier transform
weighting coefficient
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PCT/CN2016/098476
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English (en)
French (fr)
Inventor
沙学军
李婧
梅林�
包红强
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华为技术有限公司
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Publication of WO2017054632A1 publication Critical patent/WO2017054632A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
    • H04W40/06—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources based on characteristics of available antennas
    • 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
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2671—Time domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • H04L27/2672—Frequency domain
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
    • 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
    • H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal transmitting method, a signal receiving method, a transmitting end, and a receiving end.
  • multi-antenna technology can be adopted, and multiple antennas are placed at the transmitting end, and each antenna transmits the same signal, and signals transmitted by different antennas pass through different transmission channels to reach the receiving end. Since the fading conditions of the signals in different transmission channels are different from each other, when the receiving end receives the multiplex signals arriving through different transmission channels, the multiplex signals can be recovered to obtain the original signals.
  • the time domain signal will have deep fading in the time domain fading channel, resulting in more serious fading of the multiple signals received by the receiving end.
  • the accuracy of the original signal obtained is very low.
  • the frequency domain signal will have deep fading in the frequency domain fading channel, resulting in more serious fading of the multiple signals received by the receiving end, and the accuracy of the original signal obtained when recovering according to the multiplexed signal. It is also very low.
  • an embodiment of the present invention provides a signal sending method, a signal receiving method, a transmitting end, and a receiving end.
  • the technical solution is as follows:
  • a signal transmission method comprising:
  • the second signal is a signal obtained by performing a Fourier transform on the first signal
  • the third signal is that the first signal passes through two A signal obtained by a sub-Fourier transform, the fourth signal being a signal obtained by three-time Fourier transform of the first signal.
  • the acquiring the multiple signals includes:
  • the first signal and the fourth signal are performed according to a weighting coefficient of the first signal and a weighting coefficient of the fourth signal
  • the signals are weighted and combined to obtain a first mixed carrier signal, including:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • the fourth signal is represented
  • w 3 (a) represents a weighting coefficient of the fourth signal
  • a represents a dynamic parameter.
  • the weighting coefficient of the second signal and the weighting coefficient of the third signal, the second signal and the third The signals are weighted and combined to obtain a second mixed carrier signal, including:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • the third signal is represented
  • w 2 (a) represents a weighting coefficient of the third signal
  • a represents a dynamic parameter.
  • the method further includes:
  • a signal receiving method comprising:
  • the second signal, the third signal, and the fourth signal are respectively signals obtained by the first signal undergoing at least one Fourier transform.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal
  • the third signal is that the first signal passes through two A signal obtained by a sub-Fourier transform, the fourth signal being a signal obtained by three-time Fourier transform of the first signal.
  • a transmitting end is provided, where the transmitting end includes:
  • a signal acquisition module configured to acquire a multiplex signal, where the multiplex signal includes the first signal, the second signal, the third signal, and the fourth signal, the second signal, the third signal, and the The four signals are respectively signals obtained by the first signal passing through at least one Fourier transform;
  • a merging module configured to weight combine the first signal and the fourth signal according to a weighting coefficient of the first signal and a weighting coefficient of the fourth signal, to obtain a first mixed carrier signal
  • the merging module is further configured to weight combine the second signal and the third signal according to a weighting coefficient of the second signal and a weighting coefficient of the third signal to obtain a second mixed carrier signal;
  • a sending module configured to send the first hybrid carrier signal by using the configured first antenna
  • the sending module is further configured to send the second hybrid carrier signal by using the configured second antenna, so that the receiving end receives the combined signal of the first mixed carrier signal and the second mixed carrier signal,
  • the combined signal is subjected to a weighted fractional Fourier transform to obtain an estimated value of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal
  • the third signal is that the first signal passes through two A signal obtained by a sub-Fourier transform, the fourth signal being a signal obtained by three-time Fourier transform of the first signal.
  • the signal acquiring module is further configured to acquire the first signal, perform a Fourier transform on the first signal, to obtain the second signal, Performing a Fourier transform on the second signal to obtain the third signal, and performing a Fourier transform on the third signal to obtain the fourth signal.
  • the merging module is further configured to apply weighting and combining the first signal and the fourth signal to obtain the first Mixed carrier signal:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • the fourth signal is represented
  • w 3 (a) represents a weighting coefficient of the fourth signal
  • a represents a dynamic parameter.
  • the merging module is further configured to apply the following formula to weight combine the second signal and the third signal to obtain the second Mixed carrier signal:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • the third signal is represented
  • w 2 (a) represents a weighting coefficient of the third signal
  • a represents a dynamic parameter.
  • the transmitting end further includes:
  • a delay adjustment module configured to perform delay adjustment on the first mixed carrier signal and the second mixed carrier signal according to a delay feedback parameter
  • the sending module is further configured to send, by using the first antenna, a first mixed carrier signal after delay adjustment;
  • the sending module is further configured to send, by using the second antenna, a delay-adjusted second hybrid carrier signal, so that the receiving end receives the first mixed carrier signal and the second hybrid at the same time Carrier signal.
  • a receiving end is provided, where the receiving end includes:
  • a receiving module configured to receive a first mixed carrier signal that is sent by the transmitting end by using the first antenna, where the first mixed carrier signal is weighted and combined by the first signal and the fourth signal;
  • the receiving module is further configured to receive a second hybrid carrier signal sent by the transmitting end by using a second antenna, where the second mixed carrier signal is weighted and combined by the second signal and the third signal;
  • a processing module configured to perform a weighted fractional Fourier transform on the combined signal of the first mixed carrier signal and the second mixed carrier signal to obtain an estimated value of the first signal
  • the second signal, the third signal, and the fourth signal are respectively signals obtained by the first signal undergoing at least one Fourier transform.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal
  • the third signal is that the first signal passes through two A signal obtained by a sub-Fourier transform, the fourth signal being a signal obtained by three-time Fourier transform of the first signal.
  • the four-way weighted fractional Fourier transform is performed on the signal to be transmitted at the transmitting end, and four signals having a constraint relationship with each other are obtained, and the time domain signal and the frequency domain signal in the obtained four-way signal are combined to obtain a two-way hybrid.
  • the carrier signal transmits two mixed carrier signals respectively through the configured two antennas.
  • the first hybrid carrier signal and the second hybrid carrier signal have a constraint relationship, and the receiving end can recover the original signal by using the constraint relationship, and can recover effectively according to the first hybrid carrier signal and the second hybrid carrier signal. Resist the fading of the signal to the channel and improve the accuracy of the original signal. Reduce the bit error rate.
  • FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • FIG. 2 is a flowchart of a signal sending method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a signal receiving method according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a transmitting system according to an embodiment of the present invention.
  • 6A is a schematic structural diagram of an information modulation and combining module according to an embodiment of the present invention.
  • 6B is a schematic structural diagram of a delay adjustment module according to an embodiment of the present invention.
  • 7A is a schematic diagram of error performance of an antenna and two antennas according to an embodiment of the present invention.
  • FIG. 7B is a schematic diagram of error performance of different carrier systems according to an embodiment of the present invention.
  • FIG. 7C is a schematic diagram of complete transmission and component transmission of a WFRFT signal according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • FIG. 9 is a schematic structural diagram of a receiving end 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.
  • WFRFT Weighted-type Fractional Fourier Transform
  • the function g(x) is subjected to 1-3 Fourier transforms, and the result of the transformation can be expressed as G(x), g(-x), and G(-x), respectively.
  • the WFRFT of the function g(x) is determined according to four basic state functions and corresponding weighting coefficients, which are specifically defined as:
  • g(x), G(x), g(-x), G(-x) are four basic state functions
  • w 0 (a), w 1 (a), w 2 (a), w 3 (a) is a weighting factor for the four basic state functions.
  • the original function g(x) can be obtained by performing a weighted fractional Fourier transform on F[g(x)] obtained after WFRFT.
  • FIG. 1 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • the embodiment of the present invention is applied to a scenario in which a transmitting end sends a signal to a receiving end, where the communication system includes a transmitting end and a receiving end, and the transmitting end includes the transmitting end and the receiving end.
  • the end is configured with at least two antennas.
  • the transmitting end is configured to acquire a multi-path signal, where the multi-channel signal includes the first signal, the second signal, the third signal, and the fourth signal, where the second signal, the third signal, and the fourth signal are respectively a signal obtained by at least one Fourier transform of a signal; weighting and combining the first signal and the fourth signal according to a weighting coefficient of the first signal and a weighting coefficient of the fourth signal to obtain a first mixed carrier signal; a weighting coefficient of the second signal and a weighting coefficient of the third signal, weighting and combining the second signal and the third signal to obtain a second mixed carrier signal; and transmitting, by using the configured first antenna, the first hybrid carrier a signal; the second hybrid carrier signal is transmitted through the configured second antenna.
  • the receiving end is configured to receive a first mixed carrier signal that is sent by the transmitting end by using the first antenna, and receive a second mixed carrier signal that is sent by the transmitting end by using the second antenna; the first mixed carrier signal and the second hybrid carrier
  • the combined signal of the signal is subjected to a weighted fractional Fourier transform to obtain an estimated value of the first signal.
  • the embodiment of the present invention is applicable to a wireless local area network, a wireless metropolitan area network, a 3G network system, or other network systems, and is not limited in this embodiment of the present invention. .
  • FIG. 2 is a flowchart of a signal sending method according to an embodiment of the present invention.
  • the execution body of the embodiment of the present invention is a transmitting end. Referring to FIG. 2, the method includes:
  • the multiplex signal includes the first signal, the second signal, the third signal, and the fourth signal, where the second signal, the third signal, and the fourth signal are respectively the first signal
  • the time domain signal When the transmission channel is in time domain fading, the time domain signal will be fading, but the frequency domain signal is less affected, and the time domain signal has a constraint relationship with the frequency domain signal, and the inverse Fourier transform of the frequency domain signal can be restored.
  • the mixed carrier signal obtained by combining the time domain signal and the frequency domain signal is also less affected.
  • the frequency domain signal When the transmission channel is in the frequency domain fading, the frequency domain signal will be fading, but the time domain signal is less affected, and the time domain signal has a constraint relationship with the frequency domain signal, and the Fourier transform of the time domain signal can be restored.
  • the mixed carrier signal obtained by combining the time domain signal and the frequency domain signal In the frequency domain signal, the mixed carrier signal obtained by combining the time domain signal and the frequency domain signal is also less affected.
  • the time domain signal and the frequency domain signal in the four-way signal are combined to obtain two mixed carrier signals, and the original relationship between the first mixed carrier signal and the second mixed carrier signal can be used to restore the original Signal and improve the accuracy of restoring the original signal.
  • the method provided by the embodiment of the present invention performs four weighted fractional Fourier transforms on the signal to be transmitted, acquires four signals having a constraint relationship with each other, and performs time domain signals and frequency domain signals in the obtained four signals. After combining, two mixed carrier signals are obtained, and two mixed carrier signals are respectively transmitted through the configured two antennas.
  • the first hybrid carrier signal and the second hybrid carrier signal have a constraint relationship, and the receiving end can recover the original signal by using the constraint relationship, and can recover effectively according to the first hybrid carrier signal and the second hybrid carrier signal. Resist the fading of the signal to the channel, improve the accuracy of the original signal, and reduce the bit error rate.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • the acquiring the multiple signals includes:
  • the first signal and the fourth signal are weighted and combined according to the weighting coefficient of the first signal and the weighting coefficient of the fourth signal, to obtain a first mixed carrier signal, including:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • G(-x) represents the first
  • the four signals, w 3 (a) represent the weighting coefficients of the fourth signal, and a represents the dynamic parameters.
  • the second signal and the third signal are weighted and combined according to the weighting coefficient of the second signal and the weighting coefficient of the third signal, to obtain a second mixed carrier signal, including:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • g(-x) represents the first
  • the three signals, w 2 (a) represent the weighting coefficients of the third signal, and a represents the dynamic parameters.
  • the method further includes:
  • FIG. 3 is a flowchart of a signal receiving method according to an embodiment of the present invention.
  • Embodiment of the present invention The execution body is the receiving end. Referring to FIG. 3, the method includes:
  • the second signal, the third signal, and the fourth signal are respectively obtained by the at least one Fourier transform of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • the method provided by the embodiment of the present invention performs four weighted fractional Fourier transforms on the signal to be transmitted at the transmitting end, and acquires four signals having a constraint relationship with each other, and the time domain signal and the frequency domain in the obtained four signals are obtained.
  • the signals are combined to obtain two mixed carrier signals, and two mixed carrier signals are respectively transmitted through the configured two antennas.
  • the first hybrid carrier signal and the second hybrid carrier signal have a constraint relationship, and the receiving end can recover the original signal by using the constraint relationship, and can recover effectively according to the first hybrid carrier signal and the second hybrid carrier signal. Resist the fading of the signal to the channel, improve the accuracy of the original signal, and reduce the bit error rate.
  • FIG. 4 is a flowchart of a method for transmitting and receiving signals according to an embodiment of the present invention.
  • the execution body of the embodiment of the present invention is a transmitting end and a receiving end. Referring to FIG. 4, the method includes:
  • the transmitting end acquires multiple signals.
  • the transmitting end is configured to send a signal to the receiving end.
  • the transmitting end may be located at the base station or the user equipment, and the receiving end may also be located at the base station or the user equipment, which is not limited in this embodiment of the present invention.
  • the transmitting end may acquire a multiplex signal, where the multiplex signal includes the first signal, the second signal, the third signal, and the fourth signal, where the first signal is to be
  • the original signal sent to the receiving end, the second signal, the third signal and the fourth signal are respectively obtained by the at least one Fourier transform of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is the first signal.
  • the transmitting end may acquire the first signal to be sent, perform Fourier transform on the first signal, obtain the second signal, perform Fourier transform on the second signal, obtain the third signal, and perform the third signal.
  • Fourier transform to obtain the fourth signal.
  • the Fourier transform is a discrete Fourier transform or a fast Fourier transform, and is not limited in this embodiment of the present invention.
  • the transmitting end performs weighting and combining the first signal and the fourth signal according to the weighting coefficient of the first signal and the weighting coefficient of the fourth signal to obtain a first mixed carrier signal.
  • the transmitting end may perform weighting and combining the first signal and the fourth signal according to the weighting coefficient of the first signal and the weighting coefficient of the fourth signal, to obtain the first mixed carrier signal:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • G(-x) represents the first
  • the four signals, w 3 (a) represent the weighting coefficients of the fourth signal, and a represents the dynamic parameters.
  • weighting coefficient of each signal may be determined according to the dynamic parameter a. Specifically, the following formula may be applied to determine the weighting coefficient of each signal:
  • the dynamic parameter a can be set to any real number in the range [0, 4] or [-2, 2], which is not limited in the embodiment of the present invention.
  • the transmitting end performs weighting and combining the second signal and the third signal according to the weighting coefficient of the second signal and the weighting coefficient of the third signal to obtain a second mixed carrier signal.
  • the transmitting end may perform weighting and combining the second signal and the third signal according to the weighting coefficient of the second signal and the weighting coefficient of the third signal, to obtain the second mixed carrier signal:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • g(-x) represents the first
  • the three signals, w 2 (a) represent the weighting coefficients of the third signal, and a represents the dynamic parameters.
  • step 403 may also be performed before step 402, or step 402.
  • step 403 may also be performed before step 402, or step 402.
  • step 403 may also be performed before step 402, or step 402.
  • step 403 may also be performed before step 402, or step 402.
  • the embodiments of the present invention are not limited thereto.
  • the transmitting end performs delay adjustment on the first mixed carrier signal and the second mixed carrier signal according to the delay feedback parameter.
  • the transmitting end may insert a pilot sequence into the first mixed carrier signal, insert a pilot signal every fixed time interval, and then perform delay adjustment on the obtained signal according to the delay feedback parameter, thereby obtaining a delay adjustment.
  • the first mixed carrier signal may insert a pilot sequence into the first mixed carrier signal, insert a pilot signal every fixed time interval, and then perform delay adjustment on the obtained signal according to the delay feedback parameter, thereby obtaining a delay adjustment.
  • the transmitting end may insert a pilot sequence into the second mixed carrier signal, insert a pilot signal every fixed time interval, and then perform delay adjustment on the obtained signal according to the delay feedback parameter, thereby obtaining delay adjustment.
  • the second mixed carrier signal may insert a pilot sequence into the second mixed carrier signal, insert a pilot signal every fixed time interval, and then perform delay adjustment on the obtained signal according to the delay feedback parameter, thereby obtaining delay adjustment.
  • the delay feedback parameter may be fed back to the transmitting end by the receiving end, which is not limited in this embodiment of the present invention.
  • the transmitting end sends the first mixed carrier signal after the delay adjustment through the configured first antenna, and sends the second mixed carrier signal after the delay adjustment by using the configured second antenna.
  • the transmitting end is configured with at least two antennas, and the first hybrid carrier signal after the delay adjustment is sent through the configured first antenna, and the second mixed carrier signal adjusted by the delay is transmitted through the configured second antenna, so that The receiving end receives the first mixed carrier signal and the second mixed carrier signal at the same time.
  • the mixed carrier signal transmitted by the transmitting end has both a time domain signal and a frequency domain signal, and the first mixed carrier signal and the second mixed carrier signal have a constraint relationship, when the hybrid carrier on a certain channel When the fading of the signal is severe, the mixed carrier signal of the fading can be recovered by the mixed carrier signal of the other channel.
  • the receiving end receives the first mixed carrier signal and the second mixed carrier signal at the same time, receives the combined signal of the first mixed carrier signal and the second mixed carrier signal, and performs weighted score on the received combined signal.
  • An inverse Fourier transform yields an estimate of the first signal.
  • the transmitting end combines the four signals in advance according to the definition of WFRFT, and obtains two mixed carrier signals as two components of the WFRFT signal, and then sends the two mixed carrier signals through the two antennas.
  • the receiving end when the receiving end receives the two mixed carrier signals at the same time, the combined signals of the two mixed carrier signals can be obtained, thereby implementing the WFRFT process for the original signal.
  • the receiving end combines the received first mixed carrier signal F 1 [g(x)] and the second mixed carrier signal F 2 [g(x)] to obtain a combined signal as follows:
  • h 1 (t) is used to indicate the channel fading coefficient of the first mixed carrier signal from the first antenna of the transmitting end to the receiving antenna
  • h 2 (t) is used to indicate that the second mixed carrier signal is transmitted from the second antenna of the transmitting end to the receiving The channel fading coefficient of the antenna.
  • the receiving end performs a weighted fractional Fourier transform on the combined signal to obtain an estimated value of the first signal.
  • the method provided by the embodiment of the present invention performs four weighted fractional Fourier transforms on the signal to be transmitted, acquires four signals having a constraint relationship with each other, and performs time domain signals and frequency domain signals in the obtained four signals.
  • two mixed carrier signals are obtained, and two mixed carrier signals are respectively transmitted through the configured two antennas.
  • the first hybrid carrier signal and the second hybrid carrier signal have a constraint relationship, and the receiving end can recover the original signal by using the constraint relationship, and can recover effectively according to the first hybrid carrier signal and the second hybrid carrier signal. Resist the signal to the fading of the channel, improve the accuracy of the original signal, reduce the bit error rate, and use the time-frequency resources while obtaining a certain spatial diversity gain without occupying additional spectrum resources. Further, delay adjustment is performed on the first mixed carrier signal and the second mixed carrier signal according to the delay feedback parameter to ensure that the receiving end can receive the first mixed carrier signal and the second mixed carrier signal at the same time, further Increased accuracy.
  • the embodiment of the present invention provides a 2-antenna transmission method based on a four-term weighted fractional Fourier transform, which can be applied to the transmission system shown in FIG. 5, where the transmission system includes an information modulation and synthesis module, a delay feedback parameter acquisition module, No. 1 delay adjustment module, No. 2 delay adjustment module, No. 1 antenna and No. 2 antenna.
  • the output end of the information modulation and synthesis module is respectively connected with the input end of the first delay adjustment module and the input end of the second delay adjustment module, the output end of the first delay adjustment module and the first antenna and the delay feedback parameter acquisition module Connected, the output of the second delay adjustment module is connected to the second antenna and the delay feedback parameter acquisition module.
  • the signal sending method provided by the embodiment of the present invention may be implemented by the following steps:
  • Step 1 Send the first signal to be sent to the information modulation and combining module.
  • Step 2 The first signal entering the information modulation and synthesis module is modulated by information to obtain the transformed four-way signal: the data sequence to be transmitted, and the sequence of the data sequence to be transmitted after discrete Fourier transform
  • the sequence, the sequence of the data sequence to be transmitted processed by the inversion module, and the sequence of the data to be transmitted are sequentially processed by the Fourier transform module and the inversion module.
  • the information modulation module includes: a Fourier transform module, a first inversion module, a second inversion module, and a coefficient generation module.
  • the first signal passes through the first inversion module to obtain a third signal.
  • the first signal passes through the Fourier transform module to obtain a second signal, and the second signal passes through the second inversion module to obtain a fourth signal.
  • the weighting coefficients w 0 (a), w 1 (a), w 2 (a) and w 3 (a) of the four-way signal are controlled by the dynamic parameter a and generated by the coefficient generation module, and the four-way signal is synthesized with the corresponding weighting coefficients. Then send to the merge module.
  • Step 3 The four signals after the information modulation are combined to be combined.
  • the first signal to be transmitted and the first signal to be transmitted are sequentially combined by the Fourier transform module and the fourth signal obtained by the inversion module, and are combined into a first mixed carrier signal;
  • the second signal obtained after the signal is processed by the Fourier transform module and the third signal obtained after the first signal to be transmitted are processed by the inversion module are combined and combined into a second mixed carrier signal.
  • Step 4 The first mixed carrier signal after the information modulation and combining module enters the first delay adjustment module, first inserts a pilot sequence into the first mixed carrier signal, inserts the pilot signal at regular time intervals, and then sends the buffer signal into the buffer.
  • the delay adjustment is performed, and the delay control is controlled by the delay parameter fed back by the receiving end, and the first mixed carrier signal adjusted by the delay is transmitted by the first antenna and sent to the channel for transmission.
  • Step 5 The second mixed carrier signal after the information modulation and combining module enters the second delay adjustment module, first inserts a pilot sequence into the second mixed carrier signal, inserts the pilot signal at a fixed time interval, and then sends the buffer signal to the buffer.
  • the delay adjustment module is controlled by the delay parameter ⁇ fed back by the receiving end, and the second mixed carrier signal adjusted by the delay is transmitted by the second antenna and sent to the channel for transmission.
  • the delay adjustment module includes a pilot sequence module, a buffer, and a delay control module. After entering the pilot sequence module, the signal entering the delay sequence module enters the buffer for delay adjustment and is controlled by delay. The module controls the signal after the transmission delay is adjusted.
  • Figure 7A shows the error performance of a WFRFT-transformed signal transmitted by an antenna and two antennas in a time- and frequency selective fading channel.
  • the abscissa is the bit-to-noise ratio (E b /N 0 ). ), the ordinate is the bit error rate (BER).
  • BER bit error rate
  • Figure 7B shows the error performance comparison of different carrier systems transmitted by two antennas in time and frequency selective fading channels.
  • the abscissa is the bit signal-to-noise ratio (Eb/N0) and the ordinate is the bit error rate (BER). ).
  • the bit error rate of a single carrier signal is larger than the bit error rate of an OFDM (Orthogonal Frequency Division Multiplexing) signal, and the error of the OFDM signal is higher at a higher bit signal to noise ratio.
  • the bit rate is greater than the bit error rate of the WFRFT transformed signal.
  • WFRFT is applicable to a multi-antenna system, and its multi-antenna transmission error rate is greatly reduced compared with a single antenna, and WFRFT is more than single-carrier and under the same antenna number and the same channel condition. The error performance of multi-carrier systems is better.
  • Figure 7C shows the error performance comparison of the signal transmitted directly after WFRFT and the signal after WFRFT into two component emissions in the case of time and frequency selective fading.
  • the abscissa is the bit signal to noise ratio (Eb/N0). ), the ordinate is the bit error rate (BER).
  • BER bit error rate
  • FIG. 8 is a schematic structural diagram of a transmitting end according to an embodiment of the present invention.
  • the transmitting end includes:
  • the signal acquisition module 801 is configured to acquire a multiplex signal, where the multiplex signal includes the first signal, the second signal, the third signal, and the fourth signal, where the second signal, the third signal, and the fourth signal are respectively a signal obtained by the first signal passing through at least one Fourier transform;
  • the merging module 802 is configured to perform weighted combining on the first signal and the fourth signal according to the weighting coefficient of the first signal and the weighting coefficient of the fourth signal to obtain a first mixed carrier signal.
  • the merging module 802 is further configured to perform weighting and combining the second signal and the third signal according to the weighting coefficient of the second signal and the weighting coefficient of the third signal to obtain a second mixed carrier signal;
  • the sending module 803 is configured to send the first hybrid carrier signal by using the configured first antenna.
  • the sending module 803 is further configured to send the second hybrid carrier signal by using the configured second antenna, so that the receiving end receives the combined signal of the first mixed carrier signal and the second mixed carrier signal, and the combined signal is received.
  • a weighted fractional Fourier inverse transform is performed to obtain an estimated value of the first signal.
  • the transmitting end provided by the embodiment of the present invention performs four weighted fractional Fourier transforms on the signal to be transmitted, and acquires four signals having a constraint relationship with each other, and the time domain signal and the frequency domain signal in the obtained four signals are obtained. Perform the merging to obtain two mixed carrier signals, and divide the two antennas through the configuration. Do not send two mixed carrier signals.
  • the first hybrid carrier signal and the second hybrid carrier signal have a constraint relationship, and the receiving end can recover the original signal by using the constraint relationship, and can recover effectively according to the first hybrid carrier signal and the second hybrid carrier signal. Resist the fading of the signal to the channel, improve the accuracy of the original signal, and reduce the bit error rate.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • the signal obtaining module 801 is further configured to: acquire the first signal; perform Fourier transform on the first signal to obtain the second signal; perform Fourier transform on the second signal to obtain the third signal; The third signal is Fourier transformed to obtain the fourth signal.
  • the merging module 802 is further configured to apply the following formula to weight combine the first signal and the fourth signal to obtain the first mixed carrier signal:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • G(-x) represents the first
  • the four signals, w 3 (a) represent the weighting coefficients of the fourth signal, and a represents the dynamic parameters.
  • the merging module 802 is further configured to apply the following formula to weight combine the second signal and the third signal to obtain the second hybrid carrier signal:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • g(-x) represents the first
  • the three signals, w 2 (a) represent the weighting coefficients of the third signal, and a represents the dynamic parameters.
  • the transmitting end further includes:
  • a delay adjustment module configured to perform delay adjustment on the first mixed carrier signal and the second mixed carrier signal according to the delay feedback parameter
  • the sending module 803 is further configured to send, by using the first antenna, the first mixed carrier signal after the delay adjustment;
  • the sending module 803 is further configured to send, by using the second antenna, the second mixed carrier signal after the delay adjustment, so that the receiving end receives the first mixed carrier signal and the second mixed carrier signal at the same time.
  • FIG. 9 is a schematic structural diagram of a receiving end according to an embodiment of the present invention.
  • the receiving end includes:
  • the receiving module 901 is configured to receive a first mixed carrier signal that is sent by the transmitting end by using the first antenna, where the first mixed carrier signal is weighted and combined by the first signal and the fourth signal;
  • the receiving module 901 is further configured to receive a second hybrid carrier signal that is sent by the transmitting end by using the second antenna, where the second mixed carrier signal is weighted and combined by the second signal and the third signal;
  • the processing module 902 is configured to perform a weighted fractional Fourier transform on the combined signal of the first mixed carrier signal and the second mixed carrier signal to obtain an estimated value of the first signal;
  • the second signal, the third signal, and the fourth signal are respectively obtained by the at least one Fourier transform of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • the receiving end performs four weighted fractional Fourier transforms on the signal to be transmitted by the transmitting end, and acquires four signals having a constraint relationship with each other, and one time domain signal of the obtained four signals is One frequency domain signal is combined to obtain a first mixed carrier signal, and another time domain signal of the four signals is combined with another frequency domain signal to obtain a second mixed carrier signal, which is sent through two antennas configured a first hybrid carrier signal and the second mixed carrier signal.
  • the first mixed carrier signal and the second mixed carrier signal have a constraint relationship, and when the receiving end recovers according to the first mixed carrier signal and the second mixed carrier signal, the signal can effectively resist the fading of the channel and improve the original signal.
  • the accuracy rate reduces the bit error rate.
  • the transmitting end and the receiving end provided by the foregoing embodiments only use the division of the foregoing functional modules when transmitting or receiving signals.
  • the foregoing functions may be assigned different functions according to requirements.
  • the module is completed, that is, the internal structure of the transmitting end and the receiving end are divided into different functional modules to complete all or part of the functions described above.
  • the embodiments of the transmitting end and the receiving end are provided in the same manner as the method for transmitting the signal and the method for receiving the signal. The specific implementation process is described in detail in the method embodiment, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of a signal transmitting apparatus according to an embodiment of the present invention.
  • the system includes: a transformer 1001, a multi-channel combiner 1002, a transmitter 1003, and a multi-path merger.
  • the device 1002 is connected, and the multi-multiplexer 1002 is connected to the transmitter 1003.
  • the signal sending device may be a base station or a user equipment, and the like, which is not limited in this embodiment of the present invention.
  • the converter 1001 is configured to acquire a multiplex signal, where the multiplex signal includes the first signal, the second signal, the third signal, and the fourth signal, where the second signal, the third signal, and the fourth signal are respectively a signal obtained by at least one Fourier transform of a signal;
  • the multiplexer 1002 is configured to perform weighted combining on the first signal and the fourth signal according to the weighting coefficient of the first signal and the weighting coefficient of the fourth signal to obtain a first mixed carrier signal;
  • the multiplexer 1002 is further configured to perform weighting and combining the second signal and the third signal according to the weighting coefficient of the second signal and the weighting coefficient of the third signal to obtain a second mixed carrier signal;
  • the transmitter 1003 is configured to send the first hybrid carrier signal by using the configured first antenna;
  • the transmitter 1003 is further configured to send the second hybrid carrier signal by using the configured second antenna, so that the receiving end receives the combined signal of the first mixed carrier signal and the second mixed carrier signal, and weights the combined signal An inverse Fourier transform is performed to obtain an estimate of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • the converter 1001 is further configured to: acquire the first signal; perform Fourier transform on the first signal to obtain the second signal; perform Fourier transform on the second signal to obtain the third signal; The signal is Fourier transformed to obtain the fourth signal.
  • the multiplexer 1002 is further configured to apply the following formula to weight combine the first signal and the fourth signal to obtain the first mixed carrier signal:
  • F 1 [g(x)] represents the first mixed carrier signal
  • g(x) represents the first signal
  • w 0 (a) represents a weighting coefficient of the first signal
  • G(-x) represents the first
  • the four signals, w 3 (a) represent the weighting coefficients of the fourth signal, and a represents the dynamic parameters.
  • the multiplexer 1002 is further configured to apply the following formula, and weight combine the second signal and the third signal to obtain the second mixed carrier signal:
  • F 2 [g(x)] represents the second mixed carrier signal
  • G(x) represents the second signal
  • w 1 (a) represents a weighting coefficient of the second signal
  • g(-x) represents the first
  • the three signals, w 2 (a) represent the weighting coefficients of the third signal, and a represents the dynamic parameters.
  • the transmitter 1003 is further configured to: perform delay adjustment on the first hybrid carrier signal and the second hybrid carrier signal according to the delay feedback parameter; and send, by using the first antenna, the first mixture after the delay adjustment And transmitting, by the second antenna, the second mixed carrier signal after the delay adjustment, so that the receiving end receives the first mixed carrier signal and the second mixed carrier signal at the same time.
  • FIG. 10 only shows a simplified design of the signal transmitting device.
  • the signal transmitting device may also include any number of processors, memories, etc., and all signal transmitting devices that can implement the present invention are Within the scope of protection of the present invention.
  • FIG. 11 is a schematic structural diagram of a signal receiving apparatus according to an embodiment of the present invention.
  • a receiver 1101, an inverse transformer 1102, and a receiver 1101 are connected to an inverse transformer 1102.
  • the signal receiving device may be a base station or a user equipment, and the like, which is not limited in this embodiment of the present invention.
  • the receiver 1101 is configured to receive a first mixed carrier signal that is sent by the transmitting end by using the first antenna, where the first mixed carrier signal is weighted and combined by the first signal and the fourth signal;
  • the receiver 1101 is further configured to receive a second mixed carrier signal that is sent by the transmitting end by using the second antenna, where the second mixed carrier signal is weighted and combined by the second signal and the third signal;
  • the inverse transformer 1102 is configured to perform a weighted fractional Fourier transform on the combined signal of the first mixed carrier signal and the second mixed carrier signal to obtain an estimated value of the first signal;
  • the second signal, the third signal, and the fourth signal are respectively obtained by the at least one Fourier transform of the first signal.
  • the second signal is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times.
  • the signal obtained by Fourier transform is a signal obtained by performing a Fourier transform on the first signal, where the third signal is a signal obtained by two Fourier transforms of the first signal, and the fourth signal is that the first signal is three times. The signal obtained by Fourier transform.
  • FIG. 11 only shows a simplified design of the signal receiving device.
  • the signal receiving device may also include any number of processors, memories, etc., and all signal receiving devices that can implement the present invention are Within the scope of protection of the present invention.
  • the completion of the hardware may also be performed by a program to instruct related hardware.
  • the program may be stored in a computer readable storage medium.
  • the storage medium mentioned above may be a read only memory, a magnetic disk or an optical disk.

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Abstract

本发明公开了一种信号发送方法、信号接收方法、发射端及接收端，属于通信技术领域。方法包括：获取多路信号，对第一信号和第四信号进行加权合并，得到第一混合载波信号；对第二信号和第三信号进行加权合并，得到第二混合载波信号；通过配置的第一天线发送第一混合载波信号；通过配置的第二天线发送第二混合载波信号，使得接收端对第一混合载波信号和第二混合载波信号的合并信号进行接收，对合并信号进行加权分数傅立叶逆变换，得到第一信号的估计值。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端根据该两路混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率。

Description

信号发送方法、信号接收方法、发射端及接收端
本申请要求于2015年09月29日提交中国专利局、申请号为201510632620.1、发明名称为“信号发送方法、信号接收方法、发射端及接收端”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，特别涉及一种信号发送方法、信号接收方法、发射端及接收端。
背景技术
随着无线技术的迅速发展，用户对通信质量的要求越来越高。而在实际的通信过程中，信号在传播过程中很容易受到传输信道的影响而出现信号衰落。
为了解决信号衰落的问题，可以采用多天线技术，在发射端放置多根天线，每根天线发射相同的信号，不同天线发射的信号会经过不同的传输信道到达接收端。由于信号在不同传输信道中的衰落情况互不相同，接收端接收到通过不同传输信道到达的多路信号时，可以对该多路信号进行恢复，得到原始信号。
但是，时域信号在时域衰落信道中会出现深衰落，导致接收端接收到的多路信号均出现较为严重的衰落，根据该多路信号进行恢复时，得到的原始信号的准确率很低。同理地，频域信号在频域衰落信道中会出现深衰落，导致接收端接收到的多路信号均出现较为严重的衰落，根据该多路信号进行恢复时，得到的原始信号的准确率也很低。
发明内容
为了解决现有技术的问题，本发明实施例提供了一种信号发送方法、信号接收方法、发射端及接收端。所述技术方案如下：
第一方面，提供了一种信号发送方法，所述方法包括：
获取多路信号，所述多路信号包括所述第一信号、第二信号、第三信号和第四信号，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号 经过至少一次傅立叶变换得到的信号；
根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号；
根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号；
通过配置的第一天线，发送所述第一混合载波信号；
通过配置的第二天线，发送所述第二混合载波信号，使得接收端对所述第一混合载波信号和所述第二混合载波信号的合并信号进行接收，对所述合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值。
结合第一方面，在第一方面的第一种可能实现方式中，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
结合第一方面，在第一方面的第二种可能实现方式中，所述获取多路信号，包括：
获取所述第一信号；
对所述第一信号进行傅立叶变换，得到所述第二信号；
对所述第二信号进行傅立叶变换，得到所述第三信号；
对所述第三信号进行傅立叶变换，得到所述第四信号。
结合第一方面，在第一方面的第三种可能实现方式中，所述根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号，包括：
应用以下公式，对所述第一信号和所述第四信号进行加权合并，得到所述第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示所述第一混合载波信号，g(x)表示所述第一信号，w0(a)表示所述第一信号的加权系数，G(-x)表示所述第四信号，w3(a)表示所述第四信号的加权系数，a表示动态参数。
结合第一方面，在第一方面的第四种可能实现方式中，所述根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号，包括：
应用以下公式，对所述第二信号和所述第三信号进行加权合并，得到所述第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示所述第二混合载波信号，G(x)表示所述第二信号，w1(a)表示所述第二信号的加权系数，g(-x)表示所述第三信号，w2(a)表示所述第三信号的加权系数，a表示动态参数。
结合第一方面，在第一方面的第五种可能实现方式中，所述方法还包括：
根据时延反馈参数，对所述第一混合载波信号和所述第二混合载波信号进行时延调整；
通过所述第一天线，发送时延调整后的第一混合载波信号；
通过所述第二天线，发送时延调整后的第二混合载波信号，使得所述接收端在同一时刻接收到所述第一混合载波信号和所述第二混合载波信号。
第二方面，提供了一种信号接收方法，所述方法包括：
接收发射端通过第一天线发送的第一混合载波信号，所述第一混合载波信号由第一信号和第四信号加权合并得到；
接收所述发射端通过第二天线发送的第二混合载波信号，所述第二混合载波信号由第二信号和第三信号加权合并得到；
对所述第一混合载波信号和所述第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值；
其中，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号。
结合第二方面，在第二方面的第一种可能实现方式中，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
第三方面，提供了一种发射端，所述发射端包括：
信号获取模块，用于获取多路信号，所述多路信号包括所述第一信号、第二信号、第三信号和第四信号，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号；
合并模块，用于根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号；
所述合并模块，还用于根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号；
发送模块，用于通过配置的第一天线，发送所述第一混合载波信号；
所述发送模块，还用于通过配置的第二天线，发送所述第二混合载波信号，使得接收端对所述第一混合载波信号和所述第二混合载波信号的合并信号进行接收，对所述合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值。
结合第二方面，在第二方面的第一种可能实现方式中，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
结合第二方面，在第二方面的第二种可能实现方式中，所述信号获取模块还用于获取所述第一信号；对所述第一信号进行傅立叶变换，得到所述第二信号；对所述第二信号进行傅立叶变换，得到所述第三信号；对所述第三信号进行傅立叶变换，得到所述第四信号。
结合第二方面，在第二方面的第三种可能实现方式中，所述合并模块还用于应用以下公式，对所述第一信号和所述第四信号进行加权合并，得到所述第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示所述第一混合载波信号，g(x)表示所述第一信号，w0(a)表示所述第一信号的加权系数，G(-x)表示所述第四信号，w3(a)表示所述第四信号的加权系数，a表示动态参数。
结合第二方面，在第二方面的第四种可能实现方式中，所述合并模块还用于应用以下公式，对所述第二信号和所述第三信号进行加权合并，得到所述第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示所述第二混合载波信号，G(x)表示所述第二信号，w1(a)表示所述第二信号的加权系数，g(-x)表示所述第三信号，w2(a)表示所述第三 信号的加权系数，a表示动态参数。
结合第二方面，在第二方面的第五种可能实现方式中，所述发射端还包括：
时延调整模块，用于根据时延反馈参数，对所述第一混合载波信号和所述第二混合载波信号进行时延调整；
所述发送模块，还用于通过所述第一天线，发送时延调整后的第一混合载波信号；
所述发送模块，还用于通过所述第二天线，发送时延调整后的第二混合载波信号，使得所述接收端在同一时刻接收到所述第一混合载波信号和所述第二混合载波信号。
第四方面，提供了一种接收端，所述接收端包括：
接收模块，用于接收发射端通过第一天线发送的第一混合载波信号，所述第一混合载波信号由第一信号和第四信号加权合并得到；
所述接收模块，还用于接收所述发射端通过第二天线发送的第二混合载波信号，所述第二混合载波信号由第二信号和第三信号加权合并得到；
处理模块，用于对所述第一混合载波信号和所述第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值；
其中，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号。
结合第四方面，在第四方面的第一种可能实现方式中，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
本发明实施例提供的技术方案带来的有益效果是：
通过发射端对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，通过配置的两根天线分别发送两路混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端利用该约束关系可以恢复原始信号，且根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率， 降低误码率。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的一种通信系统的结构示意图；
图2是本发明实施例提供的一种信号发送方法的流程图；
图3是本发明实施例提供的一种信号接收方法的流程图；
图4是本发明实施例提供的一种信号发送、接收方法的流程图；
图5是本发明实施例提供的发射系统的结构示意图；
图6A是本发明实施例提供的信息调制及合并模块的结构示意图；
图6B是本发明实施例提供的时延调节模块的结构示意图；
图7A是本发明实施例提供的一根天线和两根天线的误码性能示意图；
图7B是本发明实施例提供的不同载波体制的误码性能示意图；
图7C是本发明实施例提供的WFRFT信号完整发射和分量发射的示意图；
图8是本发明实施例提供的一种发射端的结构示意图；
图9是本发明实施例提供的一种接收端的结构示意图；
图10是本发明实施例提供的一种信号发送设备的结构示意图；
图11是本发明实施例提供的一种信号接收设备的结构示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
在对本发明进行详细说明之前，首先对WFRFT(Weighted-type Fractional Fourier Transform，加权分数傅立叶变换)进行如下说明：
一个平方可积函数g(x)的傅立叶变换为：
Figure PCTCN2016098476-appb-000001
对函数g(x)分别进行1-3次傅立叶变换，变换结果可分别表示为G(x)、g(-x)、G(-x)。
进一步地，函数g(x)的WFRFT根据四个基本态函数和对应的加权系数确定，具体定义为：
F[g(x)]＝w0(a)g(x)+w1(a)G(x)+w2(a)g(-x)+w3(a)G(-x)；
其中，g(x)、G(x)、g(-x)、G(-x)为四个基本态函数，w0(a)、w1(a)、w2(a)、w3(a)为四个基本态函数的加权系数。
对经过WFRFT之后得到的F[g(x)]进行加权分数傅立叶逆变换，可以得到原始函数g(x)。
图1是本发明实施例提供的一种通信系统的结构示意图，参见图1，本发明实施例应用于发射端向接收端发送信号的场景下，该通信系统包括发射端和接收端，该发射端配置有至少两根天线。
该发射端用于获取多路信号，该多路信号包括该第一信号、第二信号、第三信号和第四信号，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号；根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号；根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号；通过配置的第一天线，发送该第一混合载波信号；通过配置的第二天线，发送该第二混合载波信号。
该接收端用于接收发射端通过第一天线发送的第一混合载波信号，并接收该发射端通过第二天线发送的第二混合载波信号；对该第一混合载波信号和该第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
需要说明的是，本发明实施例应用于发射端配置有多天线的情况下，可以应用于无线局域网、无线城域网、3G网络系统或者其他网络系统中，本发明实施例对此不做限定。
图2是本发明实施例提供的一种信号发送方法的流程图。本发明实施例的执行主体为发射端，参见图2，该方法包括：
201、获取多路信号，该多路信号包括该第一信号、第二信号、第三信号和第四信号，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号。
202、根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号。
203、根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号。
204、通过配置的第一天线，发送该第一混合载波信号。
205、通过配置的第二天线，发送该第二混合载波信号，使得接收端对该第一混合载波信号和该第二混合载波信号的合并信号进行接收，对该合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
当传输信道处于时域衰落时，时域信号会出现衰落，但频域信号受到的影响较小，且时域信号与频域信号之间具有约束关系，对频域信号进行傅立叶逆变换可以恢复时域信号，则由时域信号和频域信号合并得到的混合载波信号受到的影响也很小。而当传输信道处于频域衰落时，频域信号会出现衰落，但时域信号受到的影响较小，且时域信号与频域信号之间具有约束关系，对时域信号进行傅立叶变换可以恢复频域信号，则由时域信号和频域信号合并得到的混合载波信号受到的影响也很小。因此，本发明实施例将四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，利用第一混合载波信号与第二混合载波信号之间的约束关系，可以恢复原始信号，并提高恢复原始信号的准确率。
本发明实施例提供的方法，通过对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，通过配置的两根天线分别发送两路混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端利用该约束关系可以恢复原始信号，且根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
可选地，该获取多路信号，包括：
获取该第一信号；
对该第一信号进行傅立叶变换，得到该第二信号；
对该第二信号进行傅立叶变换，得到该第三信号；
对该第三信号进行傅立叶变换，得到该第四信号。
可选地，该根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号，包括：
应用以下公式，对该第一信号和该第四信号进行加权合并，得到该第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示该第一混合载波信号，g(x)表示该第一信号，w0(a)表示该第一信号的加权系数，G(-x)表示该第四信号，w3(a)表示该第四信号的加权系数，a表示动态参数。
可选地，该根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号，包括：
应用以下公式，对该第二信号和该第三信号进行加权合并，得到该第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示该第二混合载波信号，G(x)表示该第二信号，w1(a)表示该第二信号的加权系数，g(-x)表示该第三信号，w2(a)表示该第三信号的加权系数，a表示动态参数。
可选地，该方法还包括：
根据时延反馈参数，对该第一混合载波信号和该第二混合载波信号进行时延调整；
通过该第一天线，发送时延调整后的第一混合载波信号；
通过该第二天线，发送时延调整后的第二混合载波信号，使得该接收端在同一时刻接收到该第一混合载波信号和该第二混合载波信号。
上述所有可选技术方案，可以采用任意结合形成本发明的可选实施例，在此不再一一赘述。
图3是本发明实施例提供的一种信号接收方法的流程图。本发明实施例的 执行主体为接收端，参见图3，该方法包括：
301、接收发射端通过第一天线发送的第一混合载波信号，该第一混合载波信号由第一信号和第四信号加权合并得到。
302、接收该发射端通过第二天线发送的第二混合载波信号，该第二混合载波信号由第二信号和第三信号加权合并得到。
303、对该第一混合载波信号和该第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
其中，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
本发明实施例提供的方法，通过发射端对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，通过配置的两根天线分别发送两路混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端利用该约束关系可以恢复原始信号，且根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率。
图4是本发明实施例提供的一种信号发送、接收方法的流程图。本发明实施例的执行主体为发射端和接收端，参见图4，该方法包括：
401、发射端获取多路信号。
其中，该发射端用于向接收端发送信号。该发射端可以位于基站或者用户设备，该接收端也可以位于基站或者用户设备，本发明实施例对此不做限定。
在本发明实施例中，为了避免信号出现衰落，该发射端可以获取多路信号，该多路信号包括该第一信号、第二信号、第三信号和第四信号，该第一信号为待发送给接收端的原始信号，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信 号经过三次傅立叶变换得到的信号。
具体地，发射端可以获取待发送的第一信号，对该第一信号进行傅立叶变换，得到该第二信号，对该第二信号进行傅立叶变换，得到该第三信号，对该第三信号进行傅立叶变换，得到该第四信号。其中，该傅立叶变换是指离散傅立叶变换或者快速傅立叶变换等变换方式，本发明实施例对此不做限定。
402、发射端根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号。
具体地，该发射端可以根据该第一信号的加权系数和该第四信号的加权系数，应用以下公式，对该第一信号和该第四信号进行加权合并，得到该第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示该第一混合载波信号，g(x)表示该第一信号，w0(a)表示该第一信号的加权系数，G(-x)表示该第四信号，w3(a)表示该第四信号的加权系数，a表示动态参数。
进一步地，每路信号的加权系数可以根据动态参数a确定，具体地，可以应用以下公式，确定每路信号的加权系数：
Figure PCTCN2016098476-appb-000002
由于控制加权系数的调整阶数为4，该动态参数a可以设定为范围[0，4]或者[-2，2]内的任意实数，本发明实施例对此不做限定。
403、发射端根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号。
具体地，该发射端可以根据该第二信号的加权系数和该第三信号的加权系数，应用以下公式，对该第二信号和该第三信号进行加权合并，得到该第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示该第二混合载波信号，G(x)表示该第二信号，w1(a)表示该第二信号的加权系数，g(-x)表示该第三信号，w2(a)表示该第三信号的加权系数，a表示动态参数。
需要说明的是，本发明实施例仅以步骤403在步骤402之后执行为例进行说明，而在实际应用中，步骤403还可以在步骤402之前执行，或者与步骤402 同时执行，本发明实施例对此不做限定。
404、发射端根据时延反馈参数，对该第一混合载波信号和该第二混合载波信号进行时延调整。
该发射端可以对第一混合载波信号插入导频序列，每隔固定的时间间隔插入导频信号，之后，根据时延反馈参数，对得到的信号进行时延调整，从而得到时延调整完成后的第一混合载波信号。
该发射端可以对第二混合载波信号插入导频序列，每隔固定的时间间隔插入导频信号，之后，根据该时延反馈参数，对得到的信号进行时延调整，从而得到时延调整完成后的第二混合载波信号。
其中，该时延反馈参数可以由接收端反馈给该发射端，本发明实施例对此不做限定。
405、发射端通过配置的第一天线，发送时延调整后的第一混合载波信号，并通过配置的第二天线，发送时延调整后的第二混合载波信号。
发射端配置有至少两根天线，可以通过配置的第一天线，发送时延调整后的第一混合载波信号，并通过配置的第二天线，发送时延调整后的第二混合载波信号，使得接收端在同一时刻接收到该第一混合载波信号和第二混合载波信号。
本发明实施例中，发射端发射的混合载波信号中既有时域信号，也有频域信号，且第一混合载波信号与第二混合载波信号之间具有约束关系，当某一信道上的混合载波信号的衰落严重时，可以通过另一信道的混合载波信号来恢复该衰落严重的混合载波信号。
406、接收端在同一时刻接收到第一混合载波信号和第二混合载波信号，对该第一混合载波信号和该第二混合载波信号的合并信号进行接收，对接收到的合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
在本发明实施例中，发射端按照WFRFT的定义，预先将四路信号两两合并，得到两路混合载波信号，作为WFRFT信号的两路分量，再通过两根天线将两路混合载波信号发送给接收端，接收端在同一时刻接收到这两路混合载波信号时，可以得到这两路混合载波信号的合并信号，从而实现了对原始信号的WFRFT过程。
即该接收端对接收到的第一混合载波信号F1[g(x)]和第二混合载波信号F2[g(x)]进行合并，得到合并信号如下：
F[g(x)]＝h1(t)F1[g(x)]+h2(t)F2[g(x)]
＝h1(t)w0(a)g(x)+h2(t)w1(a)G(x)+h2(t)w2(a)g(-x)+h1(t)w3(a)G(-x)
其中，h1(t)用于表示第一混合载波信号从发射端的第一天线到接收天线的信道衰落系数，h2(t)用于表示第二混合载波信号从发射端的第二天线到接收天线的信道衰落系数。
此时，接收端对合并信号进行加权分数傅立叶逆变换，即可得到该第一信号的估计值。
本发明实施例提供的方法，通过对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，通过配置的两根天线分别发送两路混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端利用该约束关系可以恢复原始信号，且根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率，在不占用额外频谱资源的情况下，利用时频资源的同时，还可以获得一定的空间分集增益。进一步地，根据时延反馈参数，对第一混合载波信号和第二混合载波信号进行时延调整，以保证接收端能够在同一时刻接收到该第一混合载波信号和第二混合载波信号，进一步提高了准确率。
本发明实施例提供了一种基于四项加权分数傅立叶变换的2天线发射方法，可以应用于图5所示的发射系统中，该发射系统包括信息调制及合成模块、时延反馈参数获取模块、一号时延调节模块、二号时延调节模块、一号天线和二号天线。信息调制及合成模块的输出端分别与一号时延调节模块的输入端和二号时延调节模块输入端的连接，一号时延调节模块的输出端与一号天线和时延反馈参数获取模块连接，二号时延调节模块输出端与二号天线和时延反馈参数获取模块连接。
基于上述发射系统，本发明实施例提供的信号发送方法可以由以下步骤实现：
步骤一、将待发送的第一信号送入信息调制及合并模块。
步骤二、进入信息调制及合成模块的第一信号经过信息调制，得到变换后的四路信号：待发送的数据序列、待发送的数据序列经离散傅立叶变换后的序 列、待发送的数据序列经过反转模块处理的序列以及待发送的数据序列依次经过傅立叶变换模块和反转模块处理后的序列。
参见图6A，该信息调制模块包括：傅立叶变换模块、一号反转模块、二号反转模块和系数产生模块。
第一信号经过一号反转模块，得到第三信号，第一信号经过傅立叶变换模块，得到第二信号，第二信号再经过二号反转模块，得到第四信号。四路信号的加权系数w0(a)、w1(a)、w2(a)和w3(a)由动态参数a控制并由系数产生模块产生，四路信号与对应的加权系数合成后送入合并模块。
步骤三、经过信息调制后的四路信号进行两两合并。
在合并模块中，待发送的第一信号和待发送的第一信号依次经过傅立叶变换模块和反转模块处理后得到的第四信号进行合并，合并后为第一混合载波信号；待发送的第一信号经过傅立叶变换模块处理后得到的第二信号和待发送的第一信号经过反转模块处理后得到的第三信号进行合并，合并后为第二混合载波信号。合并完成后同时进行步骤四和步骤五。
步骤四、经过信息调制及合并模块后的第一混合载波信号进入一号时延调节模块，先对第一混合载波信号插入导频序列，每隔固定的时间间隔插入导频信号后送入缓存器进行时延调整，时延控制由接收端反馈的时延参数进行控制，完成时延调整的第一混合载波信号由一号天线进行发射，送入信道进行传输。
步骤五、经过信息调制及合并模块后的第二混合载波信号进入二号时延调节模块，先对第二混合载波信号插入导频序列，每隔固定的时间间隔插入导频信号后送入缓存器进行时延调整，时延控制模块由接收端反馈的时延参数τ进行控制，完成时延调整的第二混合载波信号由二号天线进行发射，送入信道进行传输。
参见图6B，时延调节模块包括插入导频序列模块、缓存器和时延控制模块，进入时延调节模块的信号经过插入导频序列模块后，进入缓冲器进行时延调整，由时延控制模块控制发射时延调整后的信号。
图7A给出了在时间和频率选择性衰落信道下，经过WFRFT变换后的信号分别由一根天线和两根天线发射的误码性能比较，横坐标为比特信噪比(Eb/N0)，纵坐标为误比特率(BER)。参见图7A，采用一根天线发送经过 WFRFT变换后的信号时的误比特率要大于采用两根天线发送时的误比特率。
图7B给出了时间和频率选择性衰落信道下，不同载波体制均由两根天线发射的误码性能比较，横坐标为比特信噪比(Eb/N0)，纵坐标为误比特率(BER)。参见图7B，在较高比特信噪比时，单载波(Single Carrier)信号的误比特率大于OFDM(Orthogonal Frequency Division Multiplexing)，正交频分复用)信号的误比特率，OFDM信号的误比特率大于WFRFT变换信号的误比特率。
由图7A和图7B可以看出，WFRFT适用于多天线系统中，与单天线相比，其多天线发射误码率大大降低，并且在相同天线数和相同信道条件下，WFRFT比单载波和多载波系统的误码性能要好。
图7C给出了在时间和频率选择性衰落情况下，经过WFRFT后的信号直接发射和经过WFRFT后的信号分成两个分量发射的误码性能比较，横坐标为比特信噪比(Eb/N0)，纵坐标为误比特率(BER)。参见图7B，可以看出大约在11db以后，由WFRFT分量发射比WFRFT完整发射的误码性能大大提升。
图8是本发明实施例提供的一种发射端的结构示意图，参见图8，该发射端包括：
信号获取模块801，用于获取多路信号，该多路信号包括该第一信号、第二信号、第三信号和第四信号，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号；
合并模块802，用于根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号；
该合并模块802，还用于根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号；
发送模块803，用于通过配置的第一天线，发送该第一混合载波信号；
该发送模块803，还用于通过配置的第二天线，发送该第二混合载波信号，使得接收端对该第一混合载波信号和该第二混合载波信号的合并信号进行接收，对该合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
本发明实施例提供的发射端，通过对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的时域信号和频域信号进行合并，得到两路混合载波信号，通过配置的两根天线分 别发送两路混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端利用该约束关系可以恢复原始信号，且根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
可选地，该信号获取模块801还用于获取该第一信号；对该第一信号进行傅立叶变换，得到该第二信号；对该第二信号进行傅立叶变换，得到该第三信号；对该第三信号进行傅立叶变换，得到该第四信号。
可选地，该合并模块802还用于应用以下公式，对该第一信号和该第四信号进行加权合并，得到该第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示该第一混合载波信号，g(x)表示该第一信号，w0(a)表示该第一信号的加权系数，G(-x)表示该第四信号，w3(a)表示该第四信号的加权系数，a表示动态参数。
可选地，该合并模块802还用于应用以下公式，对该第二信号和该第三信号进行加权合并，得到该第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示该第二混合载波信号，G(x)表示该第二信号，w1(a)表示该第二信号的加权系数，g(-x)表示该第三信号，w2(a)表示该第三信号的加权系数，a表示动态参数。
可选地，该发射端还包括：
时延调整模块，用于根据时延反馈参数，对该第一混合载波信号和该第二混合载波信号进行时延调整；
该发送模块803，还用于通过该第一天线，发送时延调整后的第一混合载波信号；
该发送模块803，还用于通过该第二天线，发送时延调整后的第二混合载波信号，使得该接收端在同一时刻接收到该第一混合载波信号和该第二混合载波信号。
图9是本发明实施例提供的一种接收端的结构示意图，参见图9，该接收端包括：
接收模块901，用于接收发射端通过第一天线发送的第一混合载波信号，该第一混合载波信号由第一信号和第四信号加权合并得到；
该接收模块901，还用于接收该发射端通过第二天线发送的第二混合载波信号，该第二混合载波信号由第二信号和第三信号加权合并得到；
处理模块902，用于对该第一混合载波信号和该第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值；
其中，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
本发明实施例提供的接收端，通过发射端对待发送的信号进行四项加权分数傅立叶变换，获取到相互之间具有约束关系的四路信号，将得到的四路信号中的一路时域信号和一路频域信号进行合并，得到第一混合载波信号，并将四路信号中的另一路时域信号和另一路频域信号进行合并，得到第二混合载波信号，通过配置的两根天线发送该第一混合载波信号和该第二混合载波信号。由于第一混合载波信号与第二混合载波信号之间具有约束关系，接收端根据该第一混合载波信号和该第二混合载波信号进行恢复时，能够有效抵抗信号对信道的衰落，提高原始信号的准确率，降低误码率。
需要说明的是：上述实施例提供的发射端和接收端在发送或接收信号时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将发射端和接收端的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的发射端、接收端与信号发送方法、信号接收方法的实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
图10是本发明实施例提供的一种信号发送设备的结构示意图，参见图10，包括：变换器1001、多路合并器1002、发射器1003，变换器1001与多路合并 器1002连接，多路合并器1002与发射器1003连接；
其中，该信号发送设备可以为基站或者用户设备等，本发明实施例对此不做限定。
变换器1001用于获取多路信号，该多路信号包括该第一信号、第二信号、第三信号和第四信号，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号；
多路合并器1002用于根据该第一信号的加权系数和该第四信号的加权系数，对该第一信号和该第四信号进行加权合并，得到第一混合载波信号；
多路合并器1002还用于根据该第二信号的加权系数和该第三信号的加权系数，对该第二信号和该第三信号进行加权合并，得到第二混合载波信号；
发射器1003用于通过配置的第一天线，发送该第一混合载波信号；
发射器1003还用于通过配置的第二天线，发送该第二混合载波信号，使得接收端对该第一混合载波信号和该第二混合载波信号的合并信号进行接收，对该合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
可选地，变换器1001还用于获取该第一信号；对该第一信号进行傅立叶变换，得到该第二信号；对该第二信号进行傅立叶变换，得到该第三信号；对该第三信号进行傅立叶变换，得到该第四信号。
可选地，多路合并器1002还用于应用以下公式，对该第一信号和该第四信号进行加权合并，得到该第一混合载波信号：
F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
其中，F1[g(x)]表示该第一混合载波信号，g(x)表示该第一信号，w0(a)表示该第一信号的加权系数，G(-x)表示该第四信号，w3(a)表示该第四信号的加权系数，a表示动态参数。
可选地，多路合并器1002还用于应用以下公式，对该第二信号和该第三信号进行加权合并，得到该第二混合载波信号：
F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
其中，F2[g(x)]表示该第二混合载波信号，G(x)表示该第二信号，w1(a)表示该第二信号的加权系数，g(-x)表示该第三信号，w2(a)表示该第三信号的加权 系数，a表示动态参数。
可选地，发射器1003还用于根据时延反馈参数，对该第一混合载波信号和该第二混合载波信号进行时延调整；通过该第一天线，发送时延调整后的第一混合载波信号；通过该第二天线，发送时延调整后的第二混合载波信号，使得该接收端在同一时刻接收到该第一混合载波信号和该第二混合载波信号。
上述所有可选技术方案，可以采用任意结合形成本发明的可选实施例，在此不再一一赘述。
可以理解的是，图10仅仅示出了信号发送设备的简化设计，在实际应用中，信号发送设备还可以包括任意数量的处理器、存储器等，而所有可以实现本发明的信号发送设备都在本发明的保护范围之内。
图11是本发明实施例提供的一种信号接收设备的结构示意图，参见图11，包括：接收器1101、逆变换器1102，接收器1101与逆变换器1102连接；
其中，该信号接收设备可以为基站或者用户设备等，本发明实施例对此不做限定。
接收器1101用于接收发射端通过第一天线发送的第一混合载波信号，该第一混合载波信号由第一信号和第四信号加权合并得到；
接收器1101还用于接收该发射端通过第二天线发送的第二混合载波信号，该第二混合载波信号由第二信号和第三信号加权合并得到；
逆变换器1102用于对该第一混合载波信号和该第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到该第一信号的估计值；
其中，该第二信号、该第三信号和该第四信号分别为该第一信号经过至少一次傅立叶变换得到的信号。
可选地，该第二信号为该第一信号经过一次傅立叶变换得到的信号，该第三信号为该第一信号经过两次傅立叶变换得到的信号，该第四信号为该第一信号经过三次傅立叶变换得到的信号。
可以理解的是，图11仅仅示出了信号接收设备的简化设计，在实际应用中，信号接收设备还可以包括任意数量的处理器、存储器等，而所有可以实现本发明的信号接收设备都在本发明的保护范围之内。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通 过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本发明的较佳实施例，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (16)

  1. 一种信号发送方法，其特征在于，所述方法包括：
    获取多路信号，所述多路信号包括所述第一信号、第二信号、第三信号和第四信号，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号；
    根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号；
    根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号；
    通过配置的第一天线，发送所述第一混合载波信号；
    通过配置的第二天线，发送所述第二混合载波信号，使得接收端对所述第一混合载波信号和所述第二混合载波信号的合并信号进行接收，对所述合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值。
  2. 根据权利要求1所述的方法，其特征在于，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
  3. 根据权利要求1所述的方法，其特征在于，所述获取多路信号，包括：
    获取所述第一信号；
    对所述第一信号进行傅立叶变换，得到所述第二信号；
    对所述第二信号进行傅立叶变换，得到所述第三信号；
    对所述第三信号进行傅立叶变换，得到所述第四信号。
  4. 根据权利要求1所述的方法，其特征在于，所述根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号，包括：
    应用以下公式，对所述第一信号和所述第四信号进行加权合并，得到所述第一混合载波信号：
    F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
    其中，F1[g(x)]表示所述第一混合载波信号，g(x)表示所述第一信号，w0(a)表示所述第一信号的加权系数，G(-x)表示所述第四信号，w3(a)表示所述第四信号的加权系数，a表示动态参数。
  5. 根据权利要求1所述的方法，其特征在于，所述根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号，包括：
    应用以下公式，对所述第二信号和所述第三信号进行加权合并，得到所述第二混合载波信号：
    F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
    其中，F2[g(x)]表示所述第二混合载波信号，G(x)表示所述第二信号，w1(a)表示所述第二信号的加权系数，g(-x)表示所述第三信号，w2(a)表示所述第三信号的加权系数，a表示动态参数。
  6. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    根据时延反馈参数，对所述第一混合载波信号和所述第二混合载波信号进行时延调整；
    通过所述第一天线，发送时延调整后的第一混合载波信号；
    通过所述第二天线，发送时延调整后的第二混合载波信号，使得所述接收端在同一时刻接收到所述第一混合载波信号和所述第二混合载波信号。
  7. 一种信号接收方法，其特征在于，所述方法包括：
    接收发射端通过第一天线发送的第一混合载波信号，所述第一混合载波信号由第一信号和第四信号加权合并得到；
    接收所述发射端通过第二天线发送的第二混合载波信号，所述第二混合载波信号由第二信号和第三信号加权合并得到；
    对所述第一混合载波信号和所述第二混合载波信号的合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值；
    其中，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号。
  8. 根据权利要求7所述的方法，其特征在于，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
  9. 一种发射端，其特征在于，所述发射端包括：
    信号获取模块，用于获取多路信号，所述多路信号包括所述第一信号、第二信号、第三信号和第四信号，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号；
    合并模块，用于根据所述第一信号的加权系数和所述第四信号的加权系数，对所述第一信号和所述第四信号进行加权合并，得到第一混合载波信号；
    所述合并模块，还用于根据所述第二信号的加权系数和所述第三信号的加权系数，对所述第二信号和所述第三信号进行加权合并，得到第二混合载波信号；
    发送模块，用于通过配置的第一天线，发送所述第一混合载波信号；
    所述发送模块，还用于通过配置的第二天线，发送所述第二混合载波信号，使得接收端对所述第一混合载波信号和所述第二混合载波信号的合并信号进行接收，对所述合并信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值。
  10. 根据权利要求9所述的发射端，其特征在于，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
  11. 根据权利要求9所述的发射端，其特征在于，所述信号获取模块还用于获取所述第一信号；对所述第一信号进行傅立叶变换，得到所述第二信号；对所述第二信号进行傅立叶变换，得到所述第三信号；对所述第三信号进行傅立叶变换，得到所述第四信号。
  12. 根据权利要求9所述的发射端，其特征在于，所述合并模块还用于应用以下公式，对所述第一信号和所述第四信号进行加权合并，得到所述第一混合载波信号：
    F1[g(x)]＝w0(a)g(x)+w3(a)G(-x)；
    其中，F1[g(x)]表示所述第一混合载波信号，g(x)表示所述第一信号，w0(a)表示所述第一信号的加权系数，G(-x)表示所述第四信号，w3(a)表示所述第四信号的加权系数，a表示动态参数。
  13. 根据权利要求9所述的发射端，其特征在于，所述合并模块还用于应用以下公式，对所述第二信号和所述第三信号进行加权合并，得到所述第二混合载波信号：
    F2[g(x)]＝w1(a)G(x)+w2(a)g(-x)；
    其中，F2[g(x)]表示所述第二混合载波信号，G(x)表示所述第二信号，w1(a)表示所述第二信号的加权系数，g(-x)表示所述第三信号，w2(a)表示所述第三信号的加权系数，a表示动态参数。
  14. 根据权利要求9所述的发射端，其特征在于，所述发射端还包括：
    时延调整模块，用于根据时延反馈参数，对所述第一混合载波信号和所述第二混合载波信号进行时延调整；
    所述发送模块，还用于通过所述第一天线，发送时延调整后的第一混合载波信号；
    所述发送模块，还用于通过所述第二天线，发送时延调整后的第二混合载波信号，使得所述接收端在同一时刻接收到所述第一混合载波信号和所述第二混合载波信号。
  15. 一种接收端，其特征在于，所述接收端包括：
    接收模块，用于接收发射端通过第一天线发送的第一混合载波信号，所述第一混合载波信号由第一信号和第四信号加权合并得到；
    所述接收模块，还用于接收所述发射端通过第二天线发送的第二混合载波信号，所述第二混合载波信号由第二信号和第三信号加权合并得到；
    处理模块，用于对所述第一混合载波信号和所述第二混合载波信号的合并 信号进行加权分数傅立叶逆变换，得到所述第一信号的估计值；
    其中，所述第二信号、所述第三信号和所述第四信号分别为所述第一信号经过至少一次傅立叶变换得到的信号。
  16. 如权利要求15所述的接收端，其特征在于，所述第二信号为所述第一信号经过一次傅立叶变换得到的信号，所述第三信号为所述第一信号经过两次傅立叶变换得到的信号，所述第四信号为所述第一信号经过三次傅立叶变换得到的信号。
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