WO2022095369A1 - 一种依赖于通信距离的随机相位调制方法 - Google Patents

一种依赖于通信距离的随机相位调制方法 Download PDF

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WO2022095369A1
WO2022095369A1 PCT/CN2021/090943 CN2021090943W WO2022095369A1 WO 2022095369 A1 WO2022095369 A1 WO 2022095369A1 CN 2021090943 W CN2021090943 W CN 2021090943W WO 2022095369 A1 WO2022095369 A1 WO 2022095369A1
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岳光荣
余代中
杨霖
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电子科技大学
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • H04K1/006—Secret communication by varying or inverting the phase, at periodic or random intervals

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  • the invention belongs to the field of communication technology, and in particular relates to a random phase modulation method depending on communication distance.
  • the existing physical layer encryption authentication methods include physical layer watermarking, physical layer challenge response, cross-layer authentication, physical layer key exchange, radio frequency fingerprint and wireless channel fingerprint.
  • Most of the existing physical layer encryption and authentication technologies are based on information theory and utilize the randomness of the channel, while the potential security performance brought by some other natural factors, such as the location of the transmitter and receiver, has not been fully exploited.
  • the present invention provides a physical layer encryption algorithm, through random phase modulation depending on the communication distance, so that the receiver at the expected distance can receive the signal with the correct phase, and the receiver at other distances can receive the signal with the correct phase.
  • the machine receives signals with chaotic phases, which improves the secure communication capability of the wireless communication system in the spatial dimension.
  • the present invention provides a random phase modulation method dependent on communication distance, characterized in that the method comprises the following steps:
  • Step 1 Time synchronization between the transmitter and the receiver, the transmitter is used to process and transmit the original signal, and the receiver is used to recover the received signal;
  • Step 2 The transmitter and the receiver obtain the kth sampling time according to the pre-agreed sampling rate T s :
  • t 0 represents the initial time of sampling
  • Step 3 The transmitter generates the local random signal ⁇ (t 0 ) at the initial sampling time at the initial sampling time t 0 , where ⁇ (t 0 ) obeys a uniform distribution on the interval [0, 2 ⁇ ); at the kth sampling time, The transmitter generates the local random signal ⁇ (t k ) at the kth sampling time according to the local random signal ⁇ (t k -1 ) at the last sampling time.
  • the generation method is as follows:
  • ⁇ is a constant on the interval [0, 1]
  • ⁇ (t k ) is the local random signal increment generated by the transmitter at the kth sampling time, and ⁇ (t k ) obeys the constant on the interval [0, 2 ⁇ ) Evenly distributed;
  • Step 4 The transmitter calculates the sampling point offset between the transmitter and the receiver according to the transmission delay ⁇ t to the receiver in Represents an upward rounding operation; the transmitter generates a precoded signal at the kth sampling time according to the local random signal ⁇ (t k+ ⁇ ) at the k+ ⁇ sampling time
  • Step 6 The receiver estimates the transmitted signal at the k-th sampling time to obtain the received signal r k at the k-th sampling time; the receiver generates the k-th random signal ⁇ (t k ) according to the local random signal ⁇ (t k ) at the k-th sampling time Local matching signal at sub-sample time The receiver multiplies the received signal r k at the k-th sampling time by the local matching signal ⁇ k at the k-th sampling time to obtain an estimate of the original signal at the k-th sampling time
  • the method provided by the present invention performs time synchronization through a transmitter and a receiver, generates a local random signal, precodes the original signal to be sent according to the transmission delay and the generated local random signal, and realizes random phase modulation depending on the communication distance. , making full use of the potential security brought by the location of the transmitter and receiver, so that the receiver at the expected distance can receive the correct phase signal, while the receiver at other distances receives the phase position
  • the chaotic signal can improve the safe communication capability of the wireless communication system in the dimension of space.
  • Fig. 1 shows the signal processing block diagram of the transmitter of the present invention.
  • FIG. 2 shows a block diagram of the receiver signal processing of the present invention.
  • FIG. 3 shows the EVM performance of the system described in Embodiment 1
  • the distance interval from the transmitter to the receiver is 3km.
  • the transmitter and the receiver perform time synchronization
  • the transmitter generates a local random signal ⁇ (t 0 ) at the initial sampling time at the initial sampling time t 0 , where ⁇ (t 0 ) obeys a uniform distribution on the interval [0, 2 ⁇ );
  • the signal ⁇ (t k ) is generated by
  • the receiver adopts the architecture shown in FIG. 2 , the receiver estimates the transmitted signal at the kth sampling time, and obtains the received signal r k at the kth sampling time;
  • the random signal ⁇ (t k ) generates the local matching signal at the kth sampling time.
  • the receiver multiplies the received signal rk at the k -th sampling time by the local matching signal ⁇ k at the k-th sampling time to obtain an estimate of the original signal at the k-th sampling time

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Abstract

该发明公开了一种依赖于通信距离的随机相位调制方法，属于通信技术领域。本发明所提供的方法通过发射机和接收机进行时间同步，并产生本地随机信号，依据传输时延和所产生本地随机信号对待发送的原始信号进行预编码，实现依赖于通信距离的随机相位调制，充分利用了发射机和接收机的位置所带来的潜在安全性，实现在预期距离位置处的接收机能够收到相位正确的信号，而在其他距离位置处的接收机则收到相位置乱的信号，在空间的维度上提升无线通信系统的安全通信能力。

Description

一种依赖于通信距离的随机相位调制方法 技术领域
该发明属于通信技术领域，具体涉及依赖于通信距离的随机相位调制方法。
背景技术
传统的抗截获安全通信方法依赖于上层的加密和认证技术，然而随着计算能力的提升，上层的加密和认证技术面临着前所未有的挑战。例如，2019年9月，谷歌公司宣告在全球首次实现“量子霸权”：其量子计算机仅用200秒就完成了世界第一超算Summit用1万年的时间才能完成的计算，计算能力提升了15亿倍。在另一方面，随着无线接入的增加，高层加密认证技术的秘钥分配管理更加困难。基于此背景，物理层加密认证技术得到了广泛而深入的研究。物理层加密认证技术通过基于物理层的特征属性来实现加密认证，充分利用了底层信号特征属性，并且还具备较高的协议架构兼容性、高灵活性和低时延特征。
现有的物理层加密认证方法包括物理层水印、物理层挑战响应、跨层认证、物理层秘钥交换、射频指纹和无线信道指纹等。现有物理层加密认证技术大多基于信息论基础，对信道的随机性加以利用，而一些其他自然因素，例如发射机和接收机的位置，所带来的潜在安全性能没有得到充分挖掘。
发明内容
为了解决该问题，本发明提供一种物理层加密算法，通过依赖于通信距离的随机相位调制，实现在预期距离位置处的接收机能够收到相位正确的信号，而在其他距离位置处的接收机则收到相位置乱的信号，在空间的维度上提升无线通信系统的安全通信能力。
为了实现上述目的，本发明提供一种依赖于通信距离的随机相位调制方法，其特征在于，该方法包括以下步骤：
步骤1：将发射机和接收机进行时间同步，发射机用于对原始信号进行处理和发射，接收机用于对接收信号进行恢复；
步骤2：发射机和接收机依据事先约定的采样率T s，得到第k次采样时刻：
t k＝t 0+kT s
其中，t 0表示采样初始时刻；
步骤3：发射机在采样初始时刻t 0产生初始采样时刻的本地随机信号θ(t 0)，其中θ(t 0)服 从区间[0，2π)上的均匀分布；在第k次采样时刻，发射机依据上一次采样时刻的本地随机信号θ(t k-1)，产生在第k次采样时刻的本地随机信号θ(t k)，产生方法为：
Figure PCTCN2021090943-appb-000001
其中ρ为区间[0，1]上的常数，χ(t k)为在第k次采样时刻发射机产生的本地随机信号增量，并且χ(t k)服从区间[0，2π)上的均匀分布；
步骤4：发射机依据到接收机的传输时延Δt，计算发射机与接收机之间的采样点偏移
Figure PCTCN2021090943-appb-000002
其中
Figure PCTCN2021090943-appb-000003
表示向上取整操作；发射机依据第k+Δτ次采样时刻的本地随机信号θ(t k+Δτ)产生第k次采样时刻的预编码信号
Figure PCTCN2021090943-appb-000004
步骤5：发射机将第k次采样时刻的原始信号s k，与第k次采样时刻的预编码信号α k相乘，得到第k次采样时刻的发送信号x k＝s kα k，并发送至接收机，其中原始信号s k表示待发送的数据信号；
步骤6：接收机对第k次采样时刻的发送信号进行估计，得到第k次采样时刻的接收信号r k；接收机依据第k次采样时刻的本地随机信号θ(t k)，产生第k次采样时刻的本地匹配信号
Figure PCTCN2021090943-appb-000005
接收机将第k次采样时刻的接收信号r k与第k次采样时刻的本地匹配信号β k相乘，得到对所述第k次采样时刻的原始信号的估计
Figure PCTCN2021090943-appb-000006
本发明所提供的方法通过发射机和接收机进行时间同步，并产生本地随机信号，依据传输时延和所产生本地随机信号对待发送的原始信号进行预编码，实现依赖于通信距离的随机相位调制，充分利用了发射机和接收机的位置所带来的潜在安全性，实现在预期距离位置处的接收机能够收到相位正确的信号，而在其他距离位置处的接收机则收到相位置乱的信号，在空间的维度上提升无线通信系统的安全通信能力。
附图说明
图1给出了本发明发射机信号处理框图。
图2给出了本发明接收机信号处理框图。
图3给出了实施方式1所描述系统的EVM性能
具体实施方式
下面结合附图，详细说明本发明的实施方式。
发射机采用如图1所示架构，假设所述发射机和所述接收机依据事先约定的采样率T s＝0.025μs。初始采样时刻为t 0＝0。假设发射机到接收机的距离间隔为3km。
(1)所述发射机和所述接收机进行时间同步；
(2)所述发射机和所述接收机依据事先约定的采样率T s，得到第k次采样时刻t k＝kT s＝0.025kμs；
(3)所述发射机在所述采样初始时刻t 0产生初始采样时刻的本地随机信号θ(t 0)，其中θ(t 0)服从区间[0，2π)上的均匀分布；在所述第k次采样时刻，其中k＝1，2，3，…，所述发射机依据上一次采样时刻的本地随机信号θ(t k-1)，产生在所述第k次采样时刻的本地随机信号θ(t k)，产生方法为
Figure PCTCN2021090943-appb-000007
其中ρ＝0.99，χ(t k)服从区间[0，2π)上的均匀分布。
(4)所述发射机依据到所述接收机的传输时延Δt＝(3km)/c＝10μs，其中c为电磁波在空间中的传播速度，计算发射机与接收机之间的采样点偏移
Figure PCTCN2021090943-appb-000008
产生第k次采样时刻的预编码信号
Figure PCTCN2021090943-appb-000009
其中θ(t k+400)表示第k+400次采样时刻的本地随机信号。
(5)所述发射机将第k次采样时刻的原始信号s k与所述第k次采样时刻的预编码信号α k相乘，得到第k次采样时刻的发送信号x k＝s kα k，发送至接收机。
接收机采用图2所示的架构，接收机对第k次采样时刻的发送信号进行估计，得到第k次采样时刻的接收信号r k；所述接收机依据所述第k次采样时刻的本地随机信号θ(t k)，产生 第k次采样时刻的本地匹配信号
Figure PCTCN2021090943-appb-000010
所述接收机将所述第k次采样时刻的接收信号r k与所述第k次采样时刻的本地匹配信号β k相乘，得到对所述第k次采样时刻的原始信号的估计
Figure PCTCN2021090943-appb-000011
图3给出了该实施方式所描述系统的EVM性能随传输距离的关系，可以看到，只有在预期距离位置3km附近的接收机能够收到相位正确的信号，误差向量幅度EVM＝0％,在其他位置处的接收机接收到的都是相位置乱的信号，EVM值非0且大于100％。

Claims (1)

  1. 一种依赖于通信距离的随机相位调制方法，其特征在于，该方法包括以下步骤：：
    步骤1：将发射机和接收机进行时间同步，发射机用于对原始信号进行处理和发射，接收机用于对接收信号进行恢复；
    步骤2：发射机和接收机依据事先约定的采样率T s，得到第k次采样时刻：
    t k＝t 0+kT s
    其中，t 0表示采样初始时刻；
    步骤3：发射机在采样初始时刻t 0产生初始采样时刻的本地随机信号θ(t 0)，其中θ(t 0)服从区间[0，2π)上的均匀分布；在第k次采样时刻，发射机依据上一次采样时刻的本地随机信号θ(t k-1)，产生在第k次采样时刻的本地随机信号θ(t k)，产生方法为：
    Figure PCTCN2021090943-appb-100001
    其中ρ为区间[0，1]上的常数，χ(t k)为在第k次采样时刻发射机产生的本地随机信号增量，并且χ(t k)服从区间[0，2π)上的均匀分布；
    步骤4：发射机依据到接收机的传输时延Δt，计算发射机与接收机之间的采样点偏移
    Figure PCTCN2021090943-appb-100002
    其中
    Figure PCTCN2021090943-appb-100003
    表示向上取整操作；发射机依据第k+Δτ次采样时刻的本地随机信号θ(t k+Δτ)产生第k次采样时刻的预编码信号
    Figure PCTCN2021090943-appb-100004
    步骤5：发射机将第k次采样时刻的原始信号s k，与第k次采样时刻的预编码信号α k相乘，得到第k次采样时刻的发送信号x k＝s kα k，并发送至接收机，其中原始信号s k表示待发送的数据信号；
    步骤6：接收机对第k次采样时刻的发送信号进行估计，得到第k次采样时刻的接收信号r k；接收机依据第k次采样时刻的本地随机信号θ(t k)，产生第k次采样时刻的本地匹配信号
    Figure PCTCN2021090943-appb-100005
    接收机将第k次采样时刻的接收信号r k与第k次采样时刻的本地匹配信号β k相乘，得到对所述第k次采样时刻的原始信号的估计
    Figure PCTCN2021090943-appb-100006
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