WO2018119935A1 - 多天线无线通信方法和多天线无线通信装置 - Google Patents

多天线无线通信方法和多天线无线通信装置 Download PDF

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WO2018119935A1
WO2018119935A1 PCT/CN2016/113195 CN2016113195W WO2018119935A1 WO 2018119935 A1 WO2018119935 A1 WO 2018119935A1 CN 2016113195 W CN2016113195 W CN 2016113195W WO 2018119935 A1 WO2018119935 A1 WO 2018119935A1
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signal
time domain
channel
wireless communication
transmission
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PCT/CN2016/113195
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English (en)
French (fr)
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李明
刘雯菲
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深圳天珑无线科技有限公司
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Priority to PCT/CN2016/113195 priority Critical patent/WO2018119935A1/zh
Publication of WO2018119935A1 publication Critical patent/WO2018119935A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/40—Network security protocols

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  • the present application relates to the field of communications technologies, and in particular, to a multi-antenna wireless communication method and a multi-antenna wireless communication device.
  • multi-antenna wireless communication is highly vulnerable to security threats such as eavesdropping and interference due to its natural openness and broadcast characteristics.
  • physical layer security technology can be adopted to solve the information security problem in the communication process.
  • the embodiment of the present application provides a multi-antenna wireless communication method and a multi-antenna wireless communication device, which aims to solve the problem of low security of multi-antenna wireless communication in the related art, can effectively destroy the eavesdropper, and enhance the reliability of the communication system. Sex.
  • an embodiment of the present application provides a multi-antenna wireless communication method, including: performing joint processing on a transmission signal in a spatial domain and a frequency domain by using a transmission filter, where an operating parameter of the transmission filter is associated with a legal channel; Performing discrete Fourier transform on the processed transmission signal to obtain a time domain signal; performing processing of adding a cyclic prefix to the time domain signal; performing parallel-to-serial conversion processing on the processed time domain signal to obtain a final Transmitting a signal; transmitting the final transmitted signal to a receiver corresponding to the channel via a channel.
  • the method further includes: modulating the original signal to obtain the transmission signal.
  • the method further includes : Add artificial noise in the time domain that allows legitimate channels to perform normal transmission work.
  • the artificial noise is artificial artificial noise; or the artificial noise is artificial noise generated by remaining energy after power distribution using carrier energy.
  • an embodiment of the present application provides a multi-antenna wireless communication apparatus, including: a null-frequency domain processing unit, which performs joint processing on a transmission signal in a spatial domain and a frequency domain by using a transmission filter, and the transmission filter works.
  • the parameter is associated with the legal channel;
  • the signal inverse transform unit performs inverse discrete Fourier transform on the processed transmit signal to obtain a time domain signal; and adds a cyclic prefix processing unit to add the cyclic prefix to the time domain signal;
  • the parallel-to-serial conversion processing unit performs parallel-serial conversion processing on the processed time domain signal to obtain a final transmission signal, and the signal transmission unit transmits the final transmission signal to a receiver corresponding to the channel via a channel.
  • the method further includes: a signal modulating unit that modulates the original signal before processing the transmission signal in the airspace and the frequency domain by using the transmission filter in the space-frequency domain processing unit, The transmission signal is obtained.
  • the method further includes: an artificial noise adding unit, after the cyclic prefix processing unit performs the process of adding the cyclic prefix to the time domain signal, and the parallel-serial conversion processing The unit adds artificial noise that allows the legal channel to perform normal transmission work in the time domain before the unit performs the parallel-to-serial conversion process on the processed time domain signal.
  • the artificial noise is artificial artificial noise; or the artificial noise is artificial noise generated by remaining energy after power distribution using carrier energy.
  • an embodiment of the present application provides a multi-antenna wireless communication method, including: receiving a time domain signal from a sender through a channel; performing serial-to-parallel conversion and removing a cyclic prefix on the time domain signal; The subsequent time domain signal is subjected to discrete Fourier transform to obtain a null-frequency domain signal; the frequency domain signal is processed by a receiving filter, and the working parameters of the receiving filter are related to the channel of the receiver Union.
  • an embodiment of the present application provides a multi-antenna wireless communication apparatus, including: a signal receiving unit that receives a time domain signal from a sender through a channel; and a first signal processing unit that performs serialization on the time domain signal a process of converting and removing a cyclic prefix; a signal transform unit that performs a discrete Fourier transform on the processed time domain signal to obtain a null-frequency domain signal; and a second signal processing unit that passes the receive filter to the frequency domain
  • the signal is processed and the operating parameters of the receive filter are associated with the channel of the recipient.
  • a transmission filter designed according to the characteristics of the legal channel is added to the sender, and the transmission signal is processed by the transmission filter, so that The signal received by the legal receiver is as close as possible to the sender's transmission signal, reducing the difference between the signal received by the legitimate receiver and the transmitted signal.
  • the receiver also has a receiving filter designed based on the characteristics of its own channel. If the receiver is a legitimate receiver, its channel is also a legal channel, so when it receives the time domain signal from the sender, The time domain signal is processed by a transmission filter designed according to the characteristics of the legal channel, and the receiving filter of the legal channel can be effectively restored to the transmitting signal of the transmitting side.
  • the receiving party is an illegal receiver, that is, the eavesdropping party and/or the interfering party
  • the channel is an illegal channel
  • the receiving filter and the transmission filter that has processed the received signal are not applicable to the same legal channel, so The receiving filter of the illegal receiver cannot effectively recover the signal processed by the transmitting filter of the transmitting side.
  • the orthogonality of the signal is different from the illegal channel characteristics of the illegal receiver, the orthogonality of the signal is destroyed on the illegal receiver, so it is difficult for the illegal receiver to recover the original signal of the sender.
  • the signal recovered by the legal receiver will be the smallest difference from the original signal, thus ensuring the legal transmission of the signal and destroying the reception of the eavesdrope to the greatest extent, and ensuring the transmission security of the communication system.
  • FIG. 1 shows a flow chart of a multi-antenna wireless communication method of an embodiment of the present application
  • FIG. 2 is a flow chart showing a multi-antenna wireless communication method of another embodiment of the present application.
  • FIG. 3 is a block diagram of a multi-antenna wireless communication device of one embodiment of the present application.
  • FIG. 4 is a block diagram showing a multi-antenna wireless communication device of another embodiment of the present application.
  • FIG. 5 is a schematic diagram of multi-antenna wireless communication interaction of an embodiment of the present application.
  • Figure 6 shows the receiver error rate curve under different power conditions
  • Figure 7 shows the receiver error rate curve under different power conditions
  • Figure 8 shows the relationship between the receiver bit error rate performance and the number of transmitter antennas
  • Figure 9 shows the bit error rate curve under different power conditions after adding artificial noise
  • Figure 10 shows the bit error rate curve for different MMSE conditions after adding artificial noise.
  • FIG. 1 shows a flow chart of a multi-antenna wireless communication method of one embodiment of the present application.
  • a multi-antenna wireless communication method includes:
  • Step 102 Perform joint processing on the transmission signal in the airspace and the frequency domain by using a transmission filter.
  • the operating parameters of the transmission filter are associated with a legal channel.
  • a transmission filter designed according to the characteristics of the legal channel is added to the sender, and the transmission signal is processed by the transmission filter, so that the signal received by the legal receiver is as close as possible to the sender's transmission signal, thereby reducing the legal receiver.
  • the difference between the received signal and the transmitted signal is a transmission filter designed according to the characteristics of the legal channel.
  • Step 104 Perform inverse Fourier transform on the processed transmission signal to obtain a time domain signal.
  • Step 106 Perform the process of adding a cyclic prefix to the time domain signal.
  • Step 108 Perform a parallel-to-serial conversion process on the processed time domain signal to obtain a final transmission signal.
  • Step 110 Send the final transmit signal to a receiver corresponding to the channel via a channel.
  • the receiver Since the receiver also has a receive filter designed based on the characteristics of its own channel, if the receiver is a legitimate receiver, its channel is also a legitimate channel, so when it receives the time domain signal from the sender, The domain signal is processed by a transmission filter designed according to the characteristics of the legal channel, and the receiving filter of the legal channel can be effectively restored to the transmitting signal of the transmitting side.
  • the receiving party is an illegal receiver, that is, the eavesdropping party and/or the interfering party
  • the channel is an illegal channel
  • the receiving filter and the transmission filter that has processed the received signal are not applicable to the same legal channel, so The receiving filter of the illegal receiver cannot effectively recover the signal processed by the transmitting filter of the transmitting side.
  • the orthogonality of the signal is different from the illegal channel characteristics of the illegal receiver, the orthogonality of the signal is destroyed on the illegal receiver, so it is difficult for the illegal receiver to recover the original signal of the sender.
  • the signal recovered by the legal receiver will be the smallest difference from the original signal, thus ensuring the legal transmission of the signal and destroying the reception of the eavesdrope to the greatest extent, and ensuring the transmission security of the communication system.
  • the method further includes: modulating the original signal to obtain the transmission signal. Specifically, the original signal is modulated to become:
  • N is the number of carriers of OFDM (Orthogonal Frequency Division Multiplexing).
  • the method further includes: adding artificial noise in the time domain that allows the legal channel to perform normal transmission work.
  • the artificial noise is artificial noise generated by remaining energy after power distribution by using carrier energy.
  • carrier energy when the energy of communication transmission is large, power allocation of carrier energy is needed when designing the transmission filter, considering After the power distribution, there will be residual energy.
  • artificial energy can be generated by using this part of the energy, thereby further destroying the eavesdropper's reception, and at the same time saving communication security maintenance costs.
  • FIG. 2 is a flow chart showing a multi-antenna wireless communication method of another embodiment of the present application.
  • a multi-antenna wireless communication method includes:
  • Step 202 Receive a time domain signal from a sender through a channel.
  • Step 204 Perform a process of serial-to-parallel conversion and removal of a cyclic prefix on the time domain signal.
  • Step 206 Perform discrete Fourier transform on the processed time domain signal to obtain a null-frequency domain signal.
  • Step 208 The frequency domain signal is processed by a receiving filter, and an operating parameter of the receiving filter is associated with the channel of the receiver.
  • the transmitting side has a transmission filter designed according to the characteristics of the legal channel
  • the receiving side also has a receiving filter designed based on the characteristics of its own channel.
  • the receiver is a legitimate receiver, its channel is also a legal channel, so when it receives the time domain signal from the sender, the time domain signal passes through the processing of the transmission filter designed according to the characteristics of the legal channel.
  • the receiving filter of the legal channel can also effectively restore it to The sender's send signal.
  • the receiver is an illegal receiver, that is, a wiretap and/or an interferer
  • the channel is an illegal channel
  • the transmission filter and the transmission filter that processes the received signal are not applicable to the same legal channel, so it is illegal.
  • the receiving filter of the receiver cannot effectively recover the signal processed by the transmission filter of the sender.
  • the orthogonality of the signal is different from the illegal channel characteristics of the illegal receiver, the orthogonality of the signal is destroyed on the illegal receiver, so it is difficult for the illegal receiver to recover the original signal of the sender.
  • the signal recovered by the legal receiver will be the smallest difference from the original signal, thus ensuring the legal transmission of the signal and destroying the reception of the eavesdrope to the greatest extent, and ensuring the transmission security of the communication system.
  • the receiver can receive artificial noise from the sender.
  • the artificial noise is generated in the zero space of the multi-antenna legal channel, and can be completely eliminated by the legal receiver.
  • the receiver is an illegal receiver
  • the artificial noise cannot be eliminated by the channel of the illegal receiver due to the difference of the channel, thereby fading the channel of the illegal receiver, destroying the eavesdropping of the eavesdropper, and not affecting the legality.
  • the receiver's reception of the signal further ensures the secure transmission of the communication system.
  • FIG. 3 shows a block diagram of a multi-antenna wireless communication device of one embodiment of the present application.
  • a multi-antenna wireless communication apparatus 300 includes: a space-frequency domain processing unit 302 that performs joint processing on a transmission signal in a spatial domain and a frequency domain through a transmission filter, where the transmission filtering The working parameters of the device are associated with the legal channel; the signal inverse transform unit 304 performs inverse discrete Fourier transform on the processed transmitted signal to obtain a time domain signal; and adds a cyclic prefix processing unit 306 to add the time domain signal.
  • the method further includes: a signal modulation unit 312, in the air-frequency
  • the domain processing unit modulates the original signal by the transmission filter to process the transmitted signal in the spatial domain and the frequency domain to obtain the transmitted signal.
  • the method further includes: an artificial noise adding unit 314, after the cyclic prefix processing unit 306 performs the process of adding the cyclic prefix to the time domain signal, and in the parallel string
  • the conversion processing unit 308 adds artificial noise that allows the legal channel to perform normal transmission work in the time domain before the process of performing parallel-to-serial conversion on the processed time domain signal.
  • the artificial noise is artificial artificial noise; or the artificial noise is artificial noise generated by remaining energy after power distribution using carrier energy.
  • FIG. 4 is a block diagram of a multi-antenna wireless communication device of another embodiment of the present application.
  • a multi-antenna wireless communication device 400 includes: a signal receiving unit 402 that receives a time domain signal from a sender through a channel; and a first signal processing unit 404, for the time The domain signal performs a process of serial-to-parallel conversion and removal of the cyclic prefix; the signal transformation unit 406 performs discrete Fourier transform on the processed time domain signal to obtain a null-frequency domain signal; and the second signal processing unit 408 receives the A filter processes the frequency domain signal, the operating parameters of the receive filter being associated with the channel of the recipient.
  • the present application proposes a filter design method for destroying a listener's received signal in a MIMO (Multiple-Input Multiple-Output)-OFDM system.
  • MIMO Multiple-Input Multiple-Output
  • the following steps may be implemented in conjunction with the multi-antenna wireless communication interaction diagram shown in FIG. 5:
  • Step 1.1 The original signal transmitted by the sender is modulated and becomes:
  • N is the number of carriers of OFDM. Since the transmission filter of the present application is designed to process the signals in the spatial and frequency domains, the signal transmitted through the first space - frequency domain transmission filter W t, and then through the IFFT (Inverse Fast Fourier Transform) signal by the frequency domain becomes For the time domain signal.
  • IFFT Inverse Fast Fourier Transform
  • Step 1.2 Perform the cyclic prefix (CP) process again, and the purpose of adding the CP is to eliminate the subcarriers. Interference. Then, parallel-to-serial conversion is performed to propagate the data-passing multipath Rayleigh channel to the receiver.
  • the recipient includes the legal recipient and the eavesdropper.
  • Step 1.3 The channels of the sender to the legal receiver and the eavesdropper are H and G, respectively, where H is a block matrix, and each block represents a channel between the antenna of the sender and the antenna of the receiver.
  • H 1,1 represents the channel between the sender's first antenna and the receiver's first antenna. Therefore, the legal channel of MIMO-OFDM can be expressed as:
  • the form of the eavesdropping channel G is similar to H, and is expressed as follows:
  • Step 1.4 On the receiving side, the CP is removed after serial-to-parallel conversion, and the time domain signal is changed into a frequency domain signal by FFT (Fast Fourier Transform).
  • FFT Fast Fourier Transform
  • Step 1.5 The legitimate receiver and the eavesdropper use the receive filters W b and W t to recover the original signal, respectively. Since both the legitimate recipient and the eavesdropper can receive the transmitted information, this poses a threat to the security of the communication.
  • W t is designed according to the legal channel H, the purpose is to make the difference between the signal recovered by the eavesdropper and the original signal larger, and the signal error recovered by the legitimate receiver is smaller. If the legitimate receiver receives the signal as y b , then the recovered signal is:
  • the minimum mean square error can be expressed as:
  • Step 1.6 Minimize the J MSE to design the transmission filter W t to achieve the purpose of destroying eavesdropper eavesdropping.
  • the legitimate receiver can recover the original signal, and for the eavesdropper, because the signal is corrupted by orthogonality, the original signal cannot be recovered even if the receiving filter is used.
  • the signal obtained by the legal receiver is:
  • the legal receiver uses the MMSE filter W b to recover the interfered signal, and finally demodulates to recover the original signal.
  • the signal obtained by the legal receiver through the MMSE filter can be expressed as:
  • the time domain signal obtained by the eavesdropper can be expressed as:
  • the OFDM signal obtained by the eavesdropper is also non-orthogonal, and the MMSE filter W e is used to recover the interfered signal to obtain:
  • the MMSE filter also has a similar representation:
  • the filter W t is designed according to the characteristics of the legal channel. After transmission, the legal receiver can recover the original signal using the MMSE filter W b at the receiving side. For the eavesdropper, the orthogonality of the received signal is destroyed. Due to the difference of the channel, that is, the characteristics of the eavesdropping channel G and the legal channel H are different, the original signal cannot be recovered as the legitimate receiver, thus disturbing the eavesdropper. Eavesdropping enhances the reliable transmission of the system.
  • the eavesdropper's reception can be further disrupted by artificial noise.
  • Artificial noise is generated in the null space of the legal channel, which only destroys the reception of the eavesdropper.
  • Step 2.1 After the modulated transmission signal is modulated, it passes through the transmission filter W t in the frequency domain, then changes from the frequency domain to the time domain signal through the IFFT, and performs the CP process in the time domain.
  • Step 2.2 After adding the CP, artificial noise is added in the time domain, and the generated artificial noise vector is represented by Z a , and the signal is serially converted and transmitted to the receiver through the multipath Rayleigh channel.
  • the artificial noise must satisfy the condition that does not affect the legitimate receiver, that is, the legal receiver can completely eliminate the artificial noise.
  • Step 2.3 When passing the channel, Z b and Z e respectively represent the noise of the legal channel and the eavesdropping channel, and H and G respectively represent the channels of the sender to the legitimate receiver and the eavesdropper.
  • Step 2.3 After the legitimate receiver and the eavesdropper perform serial-to-parallel conversion and removal of the CP, the time domain signal is changed into a frequency domain signal by FFT.
  • Step 2.4 The legitimate receiver and the eavesdropper use the MMSE filters W b and W t to recover the original signal, respectively.
  • the legitimate receiver can completely eliminate the artificial noise and recover the original signal. And stealing For the listener, not only the orthogonality of the signal is destroyed, but also the interference of artificial noise. In this way, the interception of the eavesdropper is further disturbed, and the security performance of the communication system is improved.
  • the signal received by the legal receiver is expressed as:
  • Artificial noise is transmitted in the zero space of the legal channel H, and does not affect the reception of the normal signal by the legitimate receiver. Artificial noise is generated as follows:
  • the signal y b received by the legal receiver can be seen:
  • the legitimate receiver can completely eliminate the effects of artificial noise.
  • the signals received by the eavesdropper are as follows:
  • the artificial noise signal is adaptively generated according to the information of the transmitted signal.
  • the artificial noise signal is a BPSK (Binary Phase Shift Keying) signal. If the original signal is a QPSK (Quadrature Phase Shift Keyin) signal, the artificial noise signal is a QPSK signal. If the original signal is a high-order QAM (Quadrature Amplitude Modulation) signal, the artificial noise signal is still a QPSK signal. If the modulation mode of the original signal is unknown, Gaussian noise is used as the artificial interference signal.
  • BPSK Binary Phase Shift Keying
  • QPSK Quadrature Phase Shift Keyin
  • QAM Quadrature Amplitude Modulation
  • the present application performs the following simulation:
  • the BER of the legal receiver is smaller, and the BER difference between the legitimate receiver and the eavesdropper is larger.
  • the number of carriers is increased to 128, the BER of the legitimate receiver and the eavesdropper in the MMSE system is still larger than that of the SVD system.
  • Figure 9 shows the bit error rate curve under different power conditions after adding artificial noise, that is, the bit error rate under different power conditions under a certain MSE limit. It can be seen from Figure 9 that the legal receiver and the eavesdropper are added after artificial noise. The BER difference is larger than without artificial noise, and the BER of the legal receiver is almost constant as the power increases.
  • Figure 10 shows the bit error rate curve under different MMSE conditions after adding artificial noise, which shows the bit error rate performance of artificial noise under different MSE conditions under the limit of 50dB total power. It can be seen that the error rate of the eavesdropper after adding artificial noise is higher than that without artificial noise, and the BER of the legal receiver is almost unchanged. Therefore, artificial noise can damage the receiver's reception, but does not affect the reception of the legitimate receiver, ensuring the reliability of the communication.
  • the technical solution of the present application is described in detail above with reference to the accompanying drawings.
  • the technical solution of the present application ensures the legal transmission of the signal, and the reception of the eavesdropper is destroyed to the greatest extent, and the transmission security of the communication system is ensured.
  • the word “if” as used herein may be interpreted as “when” or “when” or “in response to determining” or “in response to detecting.”
  • the phrase “if determined” or “if detected (conditions or events stated)” may be interpreted as “when determined” or “in response to determination” or “when detected (stated condition or event) “Time” or “in response to a test (condition or event stated)”.
  • the disclosed systems, devices, and methods may be implemented in other manners.
  • the device embodiments described above are merely illustrative.
  • the division of the unit is only a logical function division.
  • multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.
  • the above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium.
  • the software functional unit is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to perform the methods of the various embodiments of the present application. Part of the steps.
  • the foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like, which can store program codes. .

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Abstract

本申请提出了一种多天线无线通信方法和一种多天线无线通信装置，其中，多天线无线通信方法包括：通过传输滤波器在空域和频域对发送信号进行联合处理，传输滤波器的工作参数与合法信道相关联；对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；将时域信号进行加循环前缀的处理；对处理后的时域信号进行并串转换的处理，得到最终发送信号；将最终发送信号经信道发送至信道对应的接收方。通过本申请的技术方案，保证了信号的合法传输，并能够最大程度上破坏窃听者的接收，保证了通信系统的传输安全。

Description

多天线无线通信方法和多天线无线通信装置 技术领域
本申请涉及通信技术领域，尤其涉及一种多天线无线通信方法和一种多天线无线通信装置。
背景技术
目前，多天线无线通信由于天然的开放性和广播性特点，极易受到窃听和干扰等安全威胁。相关技术中，可采用物理层安全技术来解决通信过程中的信息安全问题。
然而，物理层安全技术的有效性与发送方天线的数目相关，当发送方天线的数目过多时，采用物理层安全技术进行防窃听和防干扰仍旧有些吃力。
因此，如何在多天线无线通信过程中进一步有效地防止窃听和干扰，成为目前亟待解决的技术问题。
发明内容
本申请实施例提供了一种多天线无线通信方法和一种多天线无线通信装置，旨在解决相关技术中多天线无线通信的安全性较低问题，能够有效破坏窃听者，增强通信系统的可靠性。
第一方面，本申请实施例提供了一种多天线无线通信方法，包括：通过传输滤波器在空域和频域对发送信号进行联合处理，所述传输滤波器的工作参数与合法信道相关联；对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；将所述时域信号进行加循环前缀的处理；对处理后的所述时域信号进行并串转换的处理，得到最终发送信号；将所述最终发送信号经信道发送至所述信道对应的接收方。
在本申请上述实施例中，可选地，在通过传输滤波器在空域和频域对发送信号进行联合处理的步骤之前，还包括：对原始信号进行调制，得到所述发送信号。
在本申请上述实施例中，可选地，在将所述时域信号进行加循环前缀的处理的步骤之后，对处理后的所述时域信号进行并串转换的处理的步骤之前，还包括：在时域中加入允许合法信道进行正常传输工作的人工噪声。
在本申请上述实施例中，可选地，所述人工噪声为外加人工噪声；或者所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声。
第二方面，本申请实施例提供了一种多天线无线通信装置，包括：空-频域处理单元，通过传输滤波器在空域和频域对发送信号进行联合处理，所述传输滤波器的工作参数与合法信道相关联；信号逆变换单元，对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；加循环前缀处理单元，将所述时域信号进行加循环前缀的处理；并串转换处理单元，对处理后的所述时域信号进行并串转换的处理，得到最终发送信号；信号发送单元，将所述最终发送信号经信道发送至所述信道对应的接收方。
在本申请上述实施例中，可选地，还包括：信号调制单元，在空-频域处理单元通过所述传输滤波器在空域和频域对发送信号进行处理之前，对原始信号进行调制，得到所述发送信号。
在本申请上述实施例中，可选地，还包括：人工噪声加入单元，在所述加循环前缀处理单元将所述时域信号进行加循环前缀的处理之后，以及在所述并串转换处理单元对处理后的所述时域信号进行并串转换的处理之前，在时域中加入允许合法信道进行正常传输工作的人工噪声。
在本申请上述实施例中，可选地，所述人工噪声为外加人工噪声；或者所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声。
第三方面，本申请实施例提供了一种多天线无线通信方法，包括：通过信道接收来自发送方的时域信号；对所述时域信号进行串并转换和去除循环前缀的处理；对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号；通过接收滤波器对所述频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
第四方面，本申请实施例提供了一种多天线无线通信装置，包括：信号接收单元，通过信道接收来自发送方的时域信号；第一信号处理单元，对所述时域信号进行串并转换和去除循环前缀的处理；信号变换单元，对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号；第二信号处理单元，通过接收滤波器对所述频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
通过以上技术方案，针对相关技术中的多天线无线通信的安全性较低问题，在发送方增设了根据合法信道的特性设计的传输滤波器，通过该传输滤波器对发送信号进行处理，可以使得合法接收方接收到的信号尽可能地贴近发送方的发送信号，减少合法接收方接收到的信号与发送信号的差异。
同时，接收方也具有基于自身信道的特性设计的接收滤波器，如果该接收方为合法接收方，则其信道也为合法信道，故其在接收到来自发送方的时域信号时，由于该时域信号经过了根据合法信道的特性设计的传输滤波器的处理，则该合法信道的接收滤波器也就能够将其有效地恢复为发送方的发送信号。
而如果该接收方为非法接收方，也就是窃听方和/或干扰方，则其信道为非法信道，其接收滤波器与处理过接收信号的传输滤波器并不适用于同样的合法信道，故非法接收方的接收滤波器无法有效恢复经发送方的传输滤波器处理过的信号。
因此，以上技术方案，由于发送方的合法信道与非法接收方的非法信道特性的不同，信号的正交性在非法接收方被破坏，故非法接收方很难恢复出发送方的原始信号，相反地，合法接收方所恢复的信号就会与原始信号差异最小，从而保证了信号的合法传输，并最大程度上破坏窃听者的接收，保证了通信系统的传输安全。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例中所需要 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申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以这些附图获得其它的附图。
图1示出了本申请的一个实施例的多天线无线通信方法的流程图；
图2示出了本申请的另一个实施例的多天线无线通信方法的流程图；
图3示出了本申请的一个实施例的多天线无线通信装置的框图；
图4示出了本申请的另一个实施例的多天线无线通信装置的框图；
图5示出了本申请的一个实施例的多天线无线通信交互示意图；
图6示出了不同功率条件下接收方误码率曲线；
图7示出了不同功率条件下接收方误码率曲线；
图8示出了接收方误码率性能与发送方天线个数的关系；
图9示出了加人工噪声后不同功率条件下误码率曲线；
图10示出了加人工噪声后不同MMSE条件下误码率曲线。
具体实施方式
为了更好的理解本申请的技术方案，下面结合附图对本申请实施例进行详细描述。
应当明确，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
在本申请实施例中使用的术语是仅仅出于描述特定实施例的目的，而非旨在限制本申请。在本申请实施例和所附权利要求书中所使用的单数形式的“一种”、“所述”和“该”也旨在包括多数形式，除非上下文清楚地表示其他含义。
图1示出了本申请的一个实施例的多天线无线通信方法的流程图。
如图1所示，本申请的一个实施例的多天线无线通信方法，包括：
步骤102，通过传输滤波器在空域和频域对发送信号进行联合处理，所 述传输滤波器的工作参数与合法信道相关联。
在发送方增设了根据合法信道的特性设计的传输滤波器，通过该传输滤波器对发送信号进行处理，可以使得合法接收方接收到的信号尽可能地贴近发送方的发送信号，减少合法接收方接收到的信号与发送信号的差异。
步骤104，对处理后的发送信号进行离散傅里叶逆变换，得到时域信号。
步骤106，将所述时域信号进行加循环前缀的处理。
步骤108，对处理后的所述时域信号进行并串转换的处理，得到最终发送信号。
步骤110，将所述最终发送信号经信道发送至所述信道对应的接收方。
由于接收方也具有基于自身信道的特性设计的接收滤波器，如果该接收方为合法接收方，则其信道也为合法信道，故其在接收到来自发送方的时域信号时，由于该时域信号经过了根据合法信道的特性设计的传输滤波器的处理，则该合法信道的接收滤波器也就能够将其有效地恢复为发送方的发送信号。
而如果该接收方为非法接收方，也就是窃听方和/或干扰方，则其信道为非法信道，其接收滤波器与处理过接收信号的传输滤波器并不适用于同样的合法信道，故非法接收方的接收滤波器无法有效恢复经发送方的传输滤波器处理过的信号。
因此，以上技术方案，由于发送方的合法信道与非法接收方的非法信道特性的不同，信号的正交性在非法接收方被破坏，故非法接收方很难恢复出发送方的原始信号，相反地，合法接收方所恢复的信号就会与原始信号差异最小，从而保证了信号的合法传输，并最大程度上破坏窃听者的接收，保证了通信系统的传输安全。
在本申请上述实施例中，可选地，在步骤102之前，还包括：对原始信号进行调制，得到所述发送信号。具体地，原始信号经过调制之后变为：
S[S1，S2，…，SN]T
其中N是OFDM(Orthogonal Frequency Division Multiplexing，正交频分复用技术)的载波数量。
在本申请上述实施例中，可选地，在步骤106之后，步骤108之前，还包括：在时域中加入允许合法信道进行正常传输工作的人工噪声。
人工噪声产生在多天线合法信道的零空间，能被合法接收方完全消除，但是由于信道的差异性，无法被非法接收方的信道消除，从而能衰落非法接收方的信道，破坏窃听者的窃听，同时也不会影响到合法接收方对信号的接收，进一步保障了通信系统的安全传输。
其中，所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声，具体来说，当通信传输的能量较大时，在设计传输滤波器时需要对载波能量进行功率分配，考虑到功率分配之后会有剩余能量存在，为了有效的利用资源，即可利用这部分能量产生人工噪声，从而进一步破坏窃听者的接收，同时能够节省通信安全维护成本。
图2示出了本申请的另一个实施例的多天线无线通信方法的流程图。
如图2所示，本申请的另一个实施例的多天线无线通信方法，包括：
步骤202，通过信道接收来自发送方的时域信号。
步骤204，对所述时域信号进行串并转换和去除循环前缀的处理。
步骤206，对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号。
步骤208，通过接收滤波器对所述频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
也就是说，在发送方具有根据合法信道的特性设计的传输滤波器的同时，接收方也具有基于自身信道的特性设计的接收滤波器。
如果该接收方为合法接收方，则其信道也为合法信道，故其在接收到来自发送方的时域信号时，由于该时域信号经过了根据合法信道的特性设计的传输滤波器的处理，则该合法信道的接收滤波器也就能够将其有效地恢复为 发送方的发送信号。
如果该接收方为非法接收方，也就是窃听方和/或干扰方，则其信道为非法信道，其接收滤波器与处理过接收信号的传输滤波器并不适用于同样的合法信道，故非法接收方的接收滤波器无法有效恢复经发送方的传输滤波器处理过的信号。
因此，以上技术方案，由于发送方的合法信道与非法接收方的非法信道特性的不同，信号的正交性在非法接收方被破坏，故非法接收方很难恢复出发送方的原始信号，相反地，合法接收方所恢复的信号就会与原始信号差异最小，从而保证了信号的合法传输，并最大程度上破坏窃听者的接收，保证了通信系统的传输安全。
另外，可选地，接收方能够接收到来自发送方的人工噪声，当接收方为合法接收方时，由于该人工噪声产生在多天线合法信道的零空间，能被合法接收方完全消除。
但如果该接收方为非法接收方，由于信道的差异性，该人工噪声无法被非法接收方的信道消除，从而能衰落非法接收方的信道，破坏窃听者的窃听，同时也不会影响到合法接收方对信号的接收，进一步保障了通信系统的安全传输。
图3示出了本申请的一个实施例的多天线无线通信装置的框图。
如图3所示，本申请的一个实施例的多天线无线通信装置300，包括：空-频域处理单元302，通过传输滤波器在空域和频域对发送信号进行联合处理，所述传输滤波器的工作参数与合法信道相关联；信号逆变换单元304，对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；加循环前缀处理单元306，将所述时域信号进行加循环前缀的处理；并串转换处理单元308，对处理后的所述时域信号进行并串转换的处理，得到最终发送信号；信号发送单元310，将所述最终发送信号经信道发送至所述信道对应的接收方。
在本申请上述实施例中，可选地，还包括：信号调制单元312，在空-频 域处理单元通过传输滤波器在空域和频域对发送信号进行处理之前，对原始信号进行调制，得到所述发送信号。
在本申请上述实施例中，可选地，还包括：人工噪声加入单元314，在所述加循环前缀处理单元306将所述时域信号进行加循环前缀的处理之后，以及在所述并串转换处理单元308对处理后的所述时域信号进行并串转换的处理之前，在时域中加入允许合法信道进行正常传输工作的人工噪声。
在本申请上述实施例中，可选地，所述人工噪声为外加人工噪声；或者所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声。
图4示出了本申请的另一个实施例的多天线无线通信装置的框图。
如图4所示，本申请的另一个实施例的多天线无线通信装置400，包括：信号接收单元402，通过信道接收来自发送方的时域信号；第一信号处理单元404，对所述时域信号进行串并转换和去除循环前缀的处理；信号变换单元406，对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号；第二信号处理单元408，通过接收滤波器对所述频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
下面具体描述本申请的技术方案。
本申请提出一种在MIMO(Multiple-Input Multiple-Output，多变量控制系统)-OFDM系统中用来破坏窃听者接收信号的滤波器设计方法。
若发送方的天线数是NA，合法接收方和窃听者的天线数分别是NB、NE，则结合图5所示多天线无线通信交互示意图，可实施以下步骤：
步骤1.1：发送方传输的原始信号经过调制之后变为：
S[S1，S2，…，SN]T
其中N是OFDM的载波数量。由于本申请设计的传输滤波器是在空域和频域对信号进行处理，则发送信号首先经过空-频域传输滤波器Wt，再通过IFFT(快速傅里叶逆变换)由频域信号变为时域信号。
步骤1.2：再进行加循环前缀(CP)过程，加CP的目的是消除子载波之 间的干扰。接着，进行并串转换，将数据流通过多径瑞利信道传播给接收方。接收方包括合法接收方和窃听者。
步骤1.3：发送方到合法接收方和窃听者的信道分别是H、G，其中H是块矩阵，每一块代表发送方的天线到接收方天线之间的信道。例如：H1，1代表发送方第一根天线与接收方第一根天线之间的信道。所以MIMO-OFDM的合法信道可以表示为：
Figure PCTCN2016113195-appb-000001
窃听信道G的形式和H类似，有如下表示：
Figure PCTCN2016113195-appb-000002
步骤1.4：在接收方，经过串并转换之后去除CP，并通过FFT(快速傅里叶变换)把时域信号变为频域信号。
步骤1.5：合法接收方和窃听者分别用接收滤波器Wb和Wt来恢复出原始信号。由于合法接收方和窃听者都可以接收到发送的信息，这样对通信的安全性会造成威胁。
因为Wt是根据合法信道H设计的，目的是使窃听者恢复出的信号与原始信号差异更大，而合法接收方恢复出的信号差错更小。如果合法接收方接收信号是yb，那么恢复的信号为：
Figure PCTCN2016113195-appb-000003
本申请的目的是最小化合法接收方的MSE，也就是
Figure PCTCN2016113195-appb-000004
和s的均方误差。根据MMSE(最小均方误差)滤波器准则，在合法接收方，最小均方误差可以表示为：
Figure PCTCN2016113195-appb-000005
步骤1.6：最小化JMSE来设计传输滤波器Wt，以达到破坏窃听者窃听的目的。
因此，合法接收方能恢复出原始信号，而对窃听者来说，因为信号被破坏了正交性，即使使用接收滤波器也不能恢复出原始信号。
为了进一步描述以上实例，以合法接收方为例，我们令
Figure PCTCN2016113195-appb-000006
和
Figure PCTCN2016113195-appb-000007
分别表示FFT和IFFT变换矩阵，加CP和去CP的矩阵分别是
Figure PCTCN2016113195-appb-000008
和
Figure PCTCN2016113195-appb-000009
yb表示合法接收方接收的信号。
在接收方，经过串并转换之后去除CP，并通过FFT把时域信号变为频域信号之后，合法接收方得到的信号是：
Figure PCTCN2016113195-appb-000010
因为传输滤波器会破坏信号的正交性，即
Figure PCTCN2016113195-appb-000011
不是对角矩阵，合法接收方利用MMSE滤波器Wb来恢复被干扰的信号，最后经过解调恢复出原始信号。合法接收方经过MMSE滤波器得到的信号可以表示为：
Figure PCTCN2016113195-appb-000012
以及，其中：
Figure PCTCN2016113195-appb-000013
而对窃听者来说，与合法接收方的表示形式类似，去除CP之后进行FFT变换，把频域信号变为时域信号，则窃听者得到的时域信号可以表示为：
Figure PCTCN2016113195-appb-000014
窃听者得到的OFDM信号也是非正交的，利用MMSE滤波器We恢复被干扰的信号之后得到：
Figure PCTCN2016113195-appb-000015
其中，MMSE滤波器也有类似的表示形式：
Figure PCTCN2016113195-appb-000016
根据合法信道的特性对滤波器Wt进行设计，经过传输之后，合法接收方在接收方可以使用MMSE滤波器Wb恢复出原始信号。对窃听者来说，接收信号的正交性被破坏，由于信道的差异性，即窃听信道G和合法信道H的特性不同，不能和合法接收方一样恢复出原始信号，这样就干扰了窃听者的窃听，增强了系统的可靠传输。
另外，还可以通过人工噪声进一步破坏窃听者的接收。人工噪声产生在合法信道的零空间，只破坏窃听者的接收。
具体来说，实际中当发送功率较大时，在设计传输滤波器时需要对载波能量进行功率分配。考虑到功率分配之后会有剩余能量存在，我们可以利用这部分能量产生人工噪声。加入人工噪声的具体步骤如下：
步骤2.1：已经调制过的发送信号经过调制之后，在频域经过传输滤波器Wt，再通过IFFT由频域变为时域信号，并在时域进行加CP过程。
步骤2.2：加CP之后，在时域加入人工噪声，用Za表示产生的人工噪声矢量，信号经串并转换后经过多径瑞利信道发送给接收方。其中，人工噪声要满足不影响合法接收方的条件，也就是说，合法接收方能够完全消除人工噪声。
步骤2.3：经过信道时Zb、Ze分别表示合法信道和窃听信道的噪声，H、G分别表示发送方到合法接收方和窃听者的信道。
步骤2.3：合法接收方和窃听者经过串并转换和去除CP后，通过FFT把时域信号变为频域信号。
步骤2.4：合法接收方和窃听者分别用MMSE滤波器Wb和Wt来恢复出原始信号。
因此，合法接收方能够完全消除人工噪声，并恢复出原始信号。而对窃 听者来说，不仅信号的正交性被破坏，又有人工噪声的干扰。这样，进一步干扰了窃听者的接收，提高了通信系统的安全性能。
其中，合法接收方接收的信号表示为：
Figure PCTCN2016113195-appb-000017
人工噪声是在合法信道H的零空间传输，不影响合法接收方对于正常信号的接收。人工噪声的产生方式如下：
1、令Qa表示
Figure PCTCN2016113195-appb-000018
零空间的正交基，满足
Figure PCTCN2016113195-appb-000019
2、令Za＝Qad，d是复高斯随机向量，均值是0，方差为
Figure PCTCN2016113195-appb-000020
由合法接收方接收的信号yb可以看出：
Figure PCTCN2016113195-appb-000021
也就是说，合法接收方可以完全消除人工噪声的影响。
由于合法信道H和窃听信道G的差异性，窃听者接收到的信号如下：
Figure PCTCN2016113195-appb-000022
其中，
Figure PCTCN2016113195-appb-000023
所以人工噪声对窃听者有干扰作用，窃听者不能像合法接收方一样消除人工噪声的影响。
3、同时根据发送信号的信息，自适应地产生人工噪声信号。
若原始信号为BPSK，则人工噪声信号为BPSK(Binary Phase Shift Keying，二进制相移键控)信号。若原始信号为QPSK(Quadrature Phase Shift Keyin，正交相移键控)信号，则人工噪声信号为QPSK信号。若原始信号为高阶QAM(Quadrature Amplitude Modulation，正交振幅调制)信号，则人工噪声信号仍为QPSK信号。若原始信号的调制方式未知，则采用高斯噪声作为人工干扰信号。
综上所述，对于合法接收方来说，因为人工噪声产生在合法信道的零空 间，在合法接收方可以被完全消除，人工噪声的增加不会对合法接收方产生影响。但是对窃听者来说，其不能消除人工噪声的干扰，从而窃听者的接收被干扰。因此，通过增加人工噪声可以在不影响合法接收方的前提下进一步破坏窃听者，提高通信系统的安全性能。
为了进一步验证本申请的性能和有益效果，本申请进行了如下仿真：
设置发送方天线NA为4，合法接收方和窃听者的天线均为2，即NB＝NE＝2。图6和图7分别示出了载波数为64和128时不同功率条件下加滤波器的误码率曲线。
由图中可以看出，与传统SVD滤波器相比，加MMSE滤波器的MIMO-OFDM系统中，合法接收方的BER更小，并且合法接收方和窃听者之间的BER差距更大。当增加载波个数至128时，在MMSE系统中合法接收方和窃听者的BER仍然比SVD系统的大。这表明，增加MMSE传输滤波器之后，能提高通信的质量和系统的可靠性，并且该技术能在不同的载波条件下适用。
图8示出了接收方误码率性能与发送方天线个数的关系，即改变发送方天线数比较合法接收方和窃听者的误码率变化，取发送天线数目从2到10，接收方天线数NB＝NE＝2。由图8可见，随着发送天线的增大，合法接收方的误码率随之下降，而窃听者几乎保持不变。这是因为发送天线数目越多，发送方有更大的自由度来防止窃听，同时合法接收方在MMSE滤波器系统下的误码率比SVD更低，因此，MMSE滤波器可以达到更好地通信防干扰性能。
图9示出了加人工噪声后不同功率条件下误码率曲线，即在一定MSE限制下，不同功率条件下的误码率，由图9可知，加人工噪声之后合法接收方和窃听者的BER差距比不加人工噪声更大，并且随着功率的增大合法接收方的BER几乎不变。
图10示出了加人工噪声后不同MMSE条件下误码率曲线，即示出了在总功率为50dB限制下，不同MSE条件下加人工噪声的误码率性能，由图10 可知，加人工噪声后窃听者的误码率比不加人工噪声更高，而合法接收方的BER几乎不变。因此，人工噪声可以破坏窃听者的接收，但是不影响合法接收方的接收，保证了通信的可靠性。
以上结合附图详细说明了本申请的技术方案，通过本申请的技术方案，保证了信号的合法传输，并最大程度上破坏窃听者的接收，保证了通信系统的传输安全。
应当理解，本文中使用的术语“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。
取决于语境，如在此所使用的词语“如果”可以被解释成为“在……时”或“当……时”或“响应于确定”或“响应于检测”。类似地，取决于语境，短语“如果确定”或“如果检测(陈述的条件或事件)”可以被解释成为“当确定时”或“响应于确定”或“当检测(陈述的条件或事件)时”或“响应于检测(陈述的条件或事件)”。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如，多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，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。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用硬件加软件功能单元的形式实现。
上述以软件功能单元的形式实现的集成的单元，可以存储在一个计算机可读取存储介质中。上述软件功能单元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装置(可以是个人计算机，服务器，或者网络装置等)或处理器(Processor)执行本申请各个实施例所述方法的部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(Read-Only Memory，ROM)、随机存取存储器(Random Access Memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述仅为本申请的较佳实施例而已，并不用以限制本申请，凡在本申请的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本申请保护的范围之内。

Claims (10)

  1. 一种多天线无线通信方法，其特征在于，包括：
    通过传输滤波器在空域和频域对发送信号进行联合处理，所述传输滤波器的工作参数与合法信道相关联；
    对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；
    将所述时域信号进行加循环前缀的处理；
    对处理后的所述时域信号进行并串转换的处理，得到最终发送信号；
    将所述最终发送信号经信道发送至所述信道对应的接收方。
  2. 根据权利要求1所述的多天线无线通信方法，其特征在于，在通过传输滤波器在空域和频域对发送信号进行联合处理的步骤之前，还包括：
    对原始信号进行调制，得到所述发送信号。
  3. 根据权利要求1或2所述的多天线无线通信方法，其特征在于，在将所述时域信号进行加循环前缀的处理的步骤之后，对处理后的所述时域信号进行并串转换的处理的步骤之前，还包括：
    在时域中加入允许合法信道进行正常传输工作的人工噪声。
  4. 根据权利要求3所述的多天线无线通信方法，其特征在于，所述人工噪声为外加人工噪声；或者
    所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声。
  5. 一种多天线无线通信装置，其特征在于，包括：
    空-频域处理单元，通过传输滤波器在空域和频域对发送信号进行联合处理，所述传输滤波器的工作参数与合法信道相关联；
    信号逆变换单元，对处理后的发送信号进行离散傅里叶逆变换，得到时域信号；
    加循环前缀处理单元，将所述时域信号进行加循环前缀的处理；
    并串转换处理单元，对处理后的所述时域信号进行并串转换的处理，得 到最终发送信号；
    信号发送单元，将所述最终发送信号经信道发送至所述信道对应的接收方。
  6. 根据权利要求5所述的多天线无线通信装置，其特征在于，还包括：
    信号调制单元，在空-频域处理单元通过所述传输滤波器在空域和频域对发送信号进行处理之前，对原始信号进行调制，得到所述发送信号。
  7. 根据权利要求5或6所述的多天线无线通信装置，其特征在于，还包括：
    人工噪声加入单元，在所述加循环前缀处理单元将所述时域信号进行加循环前缀的处理之后，以及在所述并串转换处理单元对处理后的所述时域信号进行并串转换的处理之前，在时域中加入允许合法信道进行正常传输工作的人工噪声。
  8. 根据权利要求7所述的多天线无线通信方法，其特征在于，所述人工噪声为外加人工噪声；或者
    所述人工噪声为利用载波能量进行功率分配后的剩余能量产生的人工噪声。
  9. 一种多天线无线通信方法，其特征在于，包括：
    通过信道接收来自发送方的时域信号；
    对所述时域信号进行串并转换和去除循环前缀的处理；
    对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号；
    通过接收滤波器对所述频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
  10. 一种多天线无线通信装置，其特征在于，包括：
    信号接收单元，通过信道接收来自发送方的时域信号；
    第一信号处理单元，对所述时域信号进行串并转换和去除循环前缀的处理；
    信号变换单元，对处理后的所述时域信号进行离散傅里叶变换，得到空-频域信号；
    第二信号处理单元，通过接收滤波器对所述空-频域信号进行处理，所述接收滤波器的工作参数与接收方的所述信道相关联。
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