CN116015480B - A two-photon vector radio frequency signal generation method - Google Patents

A two-photon vector radio frequency signal generation method Download PDF

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CN116015480B
CN116015480B CN202310308955.2A CN202310308955A CN116015480B CN 116015480 B CN116015480 B CN 116015480B CN 202310308955 A CN202310308955 A CN 202310308955A CN 116015480 B CN116015480 B CN 116015480B
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CN116015480A (en
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李欣颖
潘晓龙
郭栋
忻向军
高然
董泽
常欢
胡善亭
李志沛
张琦
田清华
田凤
杨雷静
王富
张文全
武瑞德
黄鑫
闫景浩
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Jiangsu Yatai Gosi Communication Technology Co ltd
Yangtze River Delta Research Institute Of Beijing University Of Technology Jiaxing
Yatigers Shanghai Communication Technology Co ltd
Beijing Institute of Technology BIT
Beijing University of Posts and Telecommunications
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Jiangsu Yatai Gosi Communication Technology Co ltd
Yangtze River Delta Research Institute Of Beijing University Of Technology Jiaxing
Yatigers Shanghai Communication Technology Co ltd
Beijing Institute of Technology BIT
Beijing University of Posts and Telecommunications
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Abstract

本发明涉及一种双光子矢量射频信号产生方法，属于光载无线通信系统技术领域。本发明借助于可以把任意实信号转换成只含有+1和‑1的数字序列的DSM技术，以及可以实现基带光QPSK信号产生和检测的光I/Q调制和零差式相干检测架构，本发明极为灵活地为光载无线通信系统提供具有不同载波频率、不同调制格式以及不同波特率的两路相互独立的矢量射频波。这两路相互独立的矢量射频波可以携带非常高阶的QAM信号。这两路相互独立的矢量射频波可以均采用单载波调制或OFDM调制，也可以一路采用单载波调制，另一路采用OFDM调制。同时本发明避免了光偏振复用和光偏振分集的使用，从而极大地简化了系统架构并增加了系统的稳定性。

Figure 202310308955

The invention relates to a method for generating a two-photon vector radio frequency signal, which belongs to the technical field of wireless communication systems carried by light. The present invention relies on the DSM technology that can convert any real signal into a digital sequence containing only +1 and -1, and the optical I/Q modulation and homodyne coherent detection architecture that can realize baseband optical QPSK signal generation and detection. The invention flexibly provides two mutually independent vector radio frequency waves with different carrier frequencies, different modulation formats and different baud rates for the light-borne wireless communication system. These two independent vector RF waves can carry very high order QAM signals. These two channels of independent vector radio frequency waves can both be modulated by single carrier or OFDM, or one channel can be modulated by single carrier and the other channel can be modulated by OFDM. At the same time, the invention avoids the use of optical polarization multiplexing and optical polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.

Figure 202310308955

Description

一种双光子矢量射频信号产生方法A method for generating two-photon vector radio frequency signals

技术领域Technical Field

本发明属于光载无线（Radio-over-Fiber,缩写为RoF）通信系统技术领域，具体的说，涉及一种采用delta-sigma调制（delta-sigma modulation, 缩写为DSM）技术以及经典的光I/Q调制和零差式相干检测架构实现双光子矢量射频信号同时产生和检测的方法和系统。The present invention belongs to the technical field of Radio-over-Fiber (RoF) communication systems, and more specifically, to a method and system for realizing simultaneous generation and detection of dual-photon vector radio frequency signals by using delta-sigma modulation (DSM) technology and classic optical I/Q modulation and homodyne coherent detection architecture.

背景技术Background Art

光载无线（Radio-over-Fiber,缩写为RoF）融合系统兼有长传输距离和高移动性的双重优势，是未来宽带网络发展的必然趋势。在近来众多科研界所报道的RoF系统中，无线多输入多输出（multiple-input multiple output，缩写为MIMO）技术被用来增加无线传输容量，以匹配超大的光纤传输容量。但是，现有的MIMO型RoF融合系统通常需要采用光偏振复用和光偏振分集，以同时生成用于无线MIMO传输的多路矢量射频信号，这极大地增加了系统架构的复杂度。并且现有的MIMO型RoF融合系统产生和传输的多路矢量射频信号通常采用相同的载频和矢量调整格式并携带相同的信息，并且只能采用较为低阶的正交幅度调制(quadrature amplitude modulation, 缩写为QAM)，这极大地限制了系统的灵活性和频谱效率。Radio-over-Fiber (RoF) fusion systems have the dual advantages of long transmission distance and high mobility, and are an inevitable trend in the development of broadband networks in the future. In the RoF systems reported by many scientific research circles recently, wireless multiple-input multiple output (MIMO) technology is used to increase the wireless transmission capacity to match the ultra-large optical fiber transmission capacity. However, the existing MIMO-type RoF fusion system usually needs to use optical polarization multiplexing and optical polarization diversity to simultaneously generate multi-path vector RF signals for wireless MIMO transmission, which greatly increases the complexity of the system architecture. In addition, the multi-path vector RF signals generated and transmitted by the existing MIMO-type RoF fusion system usually use the same carrier frequency and vector adjustment format and carry the same information, and can only use relatively low-order quadrature amplitude modulation (QAM), which greatly limits the flexibility and spectrum efficiency of the system.

发明内容Summary of the invention

本发明的目的是为了解决现有技术存在阶数低导致频谱效率低和传输容量小的问题，提供一种双光子矢量射频信号产生方法和系统；该方法借助于可以把任意实信号转换成只含有+1和-1的数字序列的DSM技术，以及可以实现基带光QPSK信号产生和检测的光I/Q调制和零差式相干检测架构，本发明可以极为灵活地为RoF系统提供具有不同载波频率、不同调制格式以及不同波特率的两路相互独立的矢量射频波。这两路相互独立的矢量射频波可以携带非常高阶的QAM信号，例如256QAM或甚至更高。这两路相互独立的矢量射频波可以均采用单载波调制或OFDM调制，也可以一路采用单载波调制，另一路采用OFDM调制。同时本发明避免了光偏振复用和光偏振分集的使用，从而极大地简化了系统架构并增加了系统的稳定性。The purpose of the present invention is to solve the problem of low spectrum efficiency and small transmission capacity caused by low order in the prior art, and to provide a two-photon vector radio frequency signal generation method and system; the method uses the DSM technology that can convert any real signal into a digital sequence containing only +1 and -1, and the optical I/Q modulation and homodyne coherent detection architecture that can realize baseband optical QPSK signal generation and detection. The present invention can flexibly provide two independent vector radio frequency waves with different carrier frequencies, different modulation formats and different baud rates for the RoF system. The two independent vector radio frequency waves can carry very high-order QAM signals, such as 256QAM or even higher. The two independent vector radio frequency waves can both use single carrier modulation or OFDM modulation, or one can use single carrier modulation and the other can use OFDM modulation. At the same time, the present invention avoids the use of optical polarization multiplexing and optical polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.

本发明的目的是通过下述技术方案实现的；The object of the present invention is achieved through the following technical solutions:

一种双矢量射频信号产生方法，包括如下步骤：A method for generating a dual-vector radio frequency signal comprises the following steps:

步骤一、利用数字信号处理产生两个相互独立的数字矢量基带信号s1和s2；然后经由上变频处理和数字带通DSM得到数字序列s1 * 和s2 * ；Step 1: Generate two independent digital vector baseband signals s1 and s2 by digital signal processing; then obtain digital sequences s1 * and s2 * by up-conversion processing and digital bandpass DSM;

结合频率为

Figure SMS_1
的数字本振源和数字混频器，将数字矢量基带信号s1进行上变频处理，得到载波频率为
Figure SMS_2
的数字矢量射频信号；然后经由中心频率为
Figure SMS_3
的数字带通DSM转换成一个只含有+1和-1的数字序列s1 * ；与此同时，结合频率为
Figure SMS_4
的数字本振源和数字混频器，将数字矢量基带信号s2进行上变频处理，得到载波频率为
Figure SMS_5
的数字矢量射频信号；然后经由中心频率为
Figure SMS_6
的数字带通DSM转换成一个只含有+1和-1的数字序列s2 * ；The binding frequency is
Figure SMS_1
The digital local oscillator source and digital mixer are used to up-convert the digital vector baseband signal s1 to obtain a carrier frequency of
Figure SMS_2
The digital vector RF signal is then transmitted through the center frequency
Figure SMS_3
The digital bandpass DSM is converted into a digital sequence s1 * containing only +1 and -1; at the same time, the combined frequency is
Figure SMS_4
The digital local oscillator source and digital mixer are used to up-convert the digital vector baseband signal s2 to obtain a carrier frequency of
Figure SMS_5
The digital vector RF signal is then transmitted through the center frequency
Figure SMS_6
The digital bandpass DSM is converted into a digital sequence s2 * containing only +1 and -1;

步骤二、具有相同速率的数字序列s1 * 和s2 * 被分别送入同一数模转换器的同相（in-phase, 缩写为I）和正交相(quadrature-phase,缩写为Q)输入口；数模转换器的I和Q输出分别经驱动放大器放大后用来驱动光I/Q调制器，以调制来自单模激光器的工作频率为

Figure SMS_7
的连续波长的光载波，用于实现基带光QPSK调制，得到等效基带光QPSK信号；Step 2: The digital sequences s1 * and s2 * with the same rate are respectively sent to the in-phase (I) and quadrature-phase (Q) input ports of the same digital-to-analog converter; the I and Q outputs of the digital-to-analog converter are respectively amplified by the driver amplifier and used to drive the optical I/Q modulator to modulate the operating frequency of the single-mode laser.
Figure SMS_7
The continuous wavelength optical carrier is used to implement baseband optical QPSK modulation to obtain an equivalent baseband optical QPSK signal;

所述等效基带光QPSK信号同时包含两个光射频波，其中一个是载波频率为

Figure SMS_8
的携带矢量信号s1的光射频波；另一个是载波频率为
Figure SMS_9
的携带矢量信号s2的光射频波；The equivalent baseband optical QPSK signal contains two optical radio frequency waves, one of which has a carrier frequency of
Figure SMS_8
The optical RF wave carrying the vector signal s1 ; the other is the carrier frequency
Figure SMS_9
An optical radio frequency wave carrying a vector signal s2 ;

步骤三、步骤二生成的等效基带光QPSK信号经掺铒光纤放大器放大并在长度为L的单模光纤中传输后，被送入零差式相干接收机，零差式相干接收机所采用的光本振源的工作频率是

Figure SMS_10
，所述工作频率
Figure SMS_11
与工作频率
Figure SMS_12
相同；Step 3: The equivalent baseband optical QPSK signal generated in step 2 is amplified by an erbium-doped fiber amplifier and transmitted in a single-mode optical fiber with a length of L, and then sent to a homodyne coherent receiver. The operating frequency of the optical local oscillator used by the homodyne coherent receiver is
Figure SMS_10
, the operating frequency
Figure SMS_11
With the operating frequency
Figure SMS_12
same;

步骤四、零差式相干接收机检测出来的I路和Q路电信号经由模数转换器处理后，利用QPSK恢复和解调算法被恢复出发送的数字序列s1 * 和s2 *；Step 4: After the I-channel and Q-channel electrical signals detected by the homodyne coherent receiver are processed by an analog-to-digital converter, the transmitted digital sequences s1 * and s2 * are recovered using a QPSK recovery and demodulation algorithm;

恢复出的数字序列s1 * 经由中心频率为

Figure SMS_13
的带通滤波器滤波后，从中恢复出原始的矢量信号s1；同理，恢复出的数字序列s2 *经由一个中心频率为
Figure SMS_14
的带通滤波器滤波后便可以从中恢复出原始的矢量信号s2。The recovered digital sequence s1 * has a center frequency of
Figure SMS_13
After filtering with a bandpass filter, the original vector signal s1 is recovered; similarly, the recovered digital sequence s2 * is filtered through a bandpass filter with a center frequency of
Figure SMS_14
The original vector signal s2 can be restored after filtering with a bandpass filter.

所述长度L的计算方法为：The length L is calculated as follows:

Figure SMS_15
Figure SMS_15

其中，L是光纤传输长度，

Figure SMS_16
是单模激光器的工作频率，c是光在真空中的传播速度，B是等效基带光QPSK信号的波特率，D是光纤色散系数，
Figure SMS_17
是双矢量射频信号载频之差的绝对值。Where L is the fiber transmission length,
Figure SMS_16
is the operating frequency of the single-mode laser, c is the propagation speed of light in a vacuum, B is the baud rate of the equivalent baseband optical QPSK signal, D is the fiber dispersion coefficient,
Figure SMS_17
It is the absolute value of the difference between the carrier frequencies of the dual-vector RF signals.

本发明中，两个独立的数字矢量基带信号可以具有相同或不同的波特率，并采用相同或不同的矢量调制格式，所述矢量调制格式包括正交相移键控（quadrature phaseshift keying, 缩写为QPSK），8阶正交幅度调制（8-ary quadrature amplitudemodulation, 缩写为8QAM），16阶正交幅度调制（16-ary quadrature amplitudemodulation, 缩写为16QAM）， 64阶正交幅度调制（64-ary quadrature amplitudemodulation，缩写为64QAM），128阶正交幅度调制（128-ary quadrature amplitudemodulation，缩写为128QAM）等等。In the present invention, two independent digital vector baseband signals may have the same or different baud rates and adopt the same or different vector modulation formats, wherein the vector modulation formats include quadrature phase shift keying (QPSK), 8-ary quadrature amplitude modulation (8QAM), 16-ary quadrature amplitude modulation (16QAM), 64-ary quadrature amplitude modulation (64QAM), 128-ary quadrature amplitude modulation (128QAM), and the like.

本发明中，两个独立的数字矢量基带信号可以采用非常高阶的QAM调制格式，例如256阶正交幅度调制（256-ary quadrature amplitude modulation，缩写为256QAM），512阶正交幅度调制（512-ary quadrature amplitude modulation，缩写为512QAM）或甚至更高。In the present invention, two independent digital vector baseband signals can adopt very high-order QAM modulation format, such as 256-ary quadrature amplitude modulation (256QAM), 512-ary quadrature amplitude modulation (512QAM) or even higher.

本发明中，两个独立的数字矢量基带信号可以均采用单载波调制或OFDM调制，也可以一路采用单载波调制，另一路采用OFDM调制。In the present invention, two independent digital vector baseband signals may both adopt single carrier modulation or OFDM modulation, or one may adopt single carrier modulation and the other may adopt OFDM modulation.

本发明中，

Figure SMS_18
和
Figure SMS_19
可以相等或不相等。In the present invention,
Figure SMS_18
and
Figure SMS_19
Can be equal or unequal.

本发明还提供了一种采用DSM技术以及经典的光I/Q调制和零差式相干检测架构实现双矢量射频信号同时产生和检测的系统，其包括：The present invention also provides a system for realizing simultaneous generation and detection of dual-vector RF signals by using DSM technology and classic optical I/Q modulation and homodyne coherent detection architecture, which comprises:

两个数字矢量基带信号产生模块，用于产生两个独立的数字矢量基带信号s1和s2，这两个数字矢量基带信号可以具有相同或不同的波特率，并采用相同或不同的矢量调制格式，包括QPSK、8QAM、16QAM、64QAM、128QAM 或乃至非常高阶的QAM等等，这两个数字矢量基带信号可以均采用单载波调制或OFDM调制，也可以一路采用单载波调制，另一路采用OFDM调制；Two digital vector baseband signal generating modules, used for generating two independent digital vector baseband signals s1 and s2 , the two digital vector baseband signals may have the same or different baud rates, and adopt the same or different vector modulation formats, including QPSK, 8QAM, 16QAM, 64QAM, 128QAM or even very high-order QAM, etc., the two digital vector baseband signals may both adopt single carrier modulation or OFDM modulation, or one may adopt single carrier modulation and the other OFDM modulation;

两组数字本振源和数字混频器，其中一组频率为

Figure SMS_20
的数字本振源和对应的数字混频器用于将数字矢量基带信号s1上变频成载波频率为
Figure SMS_21
的数字矢量射频信号，另一组频率为
Figure SMS_22
的数字本振源和对应的数字混频器用于将数字矢量基带信号s2上变频成载波频率为
Figure SMS_23
的数字矢量射频信号，
Figure SMS_24
和
Figure SMS_25
可以相等或不相等； Two sets of digital local oscillator sources and digital mixers, one of which has a frequency of
Figure SMS_20
The digital local oscillator source and the corresponding digital mixer are used to up-convert the digital vector baseband signal s1 into a carrier frequency of
Figure SMS_21
A digital vector RF signal, and another set of frequencies are
Figure SMS_22
The digital local oscillator source and the corresponding digital mixer are used to up-convert the digital vector baseband signal s2 into a carrier frequency of
Figure SMS_23
A digital vector RF signal,
Figure SMS_24
and
Figure SMS_25
Can be equal or unequal ;

两个数字带通DSM模块，其中中心频率为

Figure SMS_26
的数字带通DSM模块将载波频率为
Figure SMS_27
的数字矢量射频信号转换成一个只含有+1和-1的数字序列s1 * ，中心频率为
Figure SMS_28
的数字带通DSM模块将载波频率为
Figure SMS_29
的数字矢量射频信号转换成一个只含有+1和-1的数字序列s2 * ，数字序列s1 * 和s2 * 具有相同的速率； Two digital bandpass DSM modules with center frequencies of
Figure SMS_26
The digital bandpass DSM module converts the carrier frequency to
Figure SMS_27
The digital vector RF signal is converted into a digital sequence s1 * containing only +1 and -1, with a center frequency of
Figure SMS_28
The digital bandpass DSM module converts the carrier frequency to
Figure SMS_29
The digital vector RF signal is converted into a digital sequence s2 * containing only +1 and -1, and the digital sequences s1 * and s2 * have the same rate ;

数模转换器，用于实现具有相同速率的数字序列s1 * 和s2 * 从数字域到模拟域的转换，从而为I/Q调制器提供I路和Q路的驱动输入；A digital-to-analog converter, used for converting digital sequences s1 * and s2 * having the same rate from a digital domain to an analog domain, thereby providing driving inputs of I and Q channels for an I/Q modulator;

两个电放大器，分别用于放大I/Q调制器I路和Q路的驱动输入；Two electrical amplifiers, used for respectively amplifying the driving inputs of the I and Q paths of the I/Q modulator;

单模激光器，用于为I/Q调制器提供工作频率为

Figure SMS_30
的连续波长的光载波输入；Single-mode laser, used to provide the I/Q modulator with an operating frequency of
Figure SMS_30
Continuous wavelength optical carrier input;

I/Q调制器，用于实现基带光QPSK调制以生成一个等效基带光QPSK信号，该等效基带光QPSK信号同时包含载波频率为

Figure SMS_31
的携带矢量信号s1的光射频波和载波频率为
Figure SMS_32
的携带矢量信号s2的光射频波；The I/Q modulator is used to implement baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal, which also includes a carrier frequency of
Figure SMS_31
The optical RF wave carrying the vector signal s1 and the carrier frequency are
Figure SMS_32
An optical radio frequency wave carrying a vector signal s2 ;

掺铒光纤放大器，用于放大生成的等效基带光QPSK信号；An erbium-doped fiber amplifier is used to amplify the generated equivalent baseband optical QPSK signal;

单模光纤，用于传输生成的等效基带光QPSK信号；Single-mode optical fiber, used to transmit the generated equivalent baseband optical QPSK signal;

零差式相干接收机和工作频率为

Figure SMS_33
的光本振源，用于对接收到的等效基带光QPSK信号进行零差检测，检测得到的I路和Q路电信号被送入到一个两路模数转换器中；Homodyne coherent receiver and the operating frequency is
Figure SMS_33
The optical local oscillator source is used to perform homodyne detection on the received equivalent baseband optical QPSK signal, and the I-channel and Q-channel electrical signals obtained by the detection are sent to a two-channel analog-to-digital converter;

模数转换器，用于实现对经由零差检测得到的I路和Q路电信号从模拟域到数字域的转换；An analog-to-digital converter, used for converting the I-channel and Q-channel electrical signals obtained by homodyne detection from an analog domain to a digital domain;

数字QPSK恢复和解调模块，用于从零差检测得到的I路和Q路信号中恢复出发送的数字序列s1 * 和s2 * ；A digital QPSK recovery and demodulation module, used to recover the transmitted digital sequences s1 * and s2 * from the I-channel and Q-channel signals obtained by homodyne detection;

两个数字带通滤波器，其中一个中心频率为

Figure SMS_34
的带通滤波器用于从恢复出的数字序列s1 * 中过滤出原始的矢量信号s1，另一个中心频率为
Figure SMS_35
的带通滤波器用于从恢复出的数字序列s2 * 中过滤出原始的矢量信号s2；Two digital bandpass filters, one with a center frequency of
Figure SMS_34
The bandpass filter is used to filter out the original vector signal s1 from the restored digital sequence s1 * , and the other one with a center frequency of
Figure SMS_35
The bandpass filter is used to filter out the original vector signal s2 from the restored digital sequence s2 * ;

两个数字矢量基带信号解调模块，用于恢复出原始的发送比特流。Two digital vector baseband signal demodulation modules are used to recover the original transmitted bit stream.

和现有技术相比，本发明的有益效果在于：Compared with the prior art, the present invention has the following beneficial effects:

本发明通过采用DSM技术以及经典的光I/Q调制和零差式相干检测架构，可以实现两路独立的矢量射频信号的同时产生和检测。The present invention can realize the simultaneous generation and detection of two independent vector radio frequency signals by adopting DSM technology and classic optical I/Q modulation and homodyne coherent detection architecture.

本发明借助于可以把任意实信号转换成只含有+1和-1的数字序列的DSM技术以及软硬件相结合的方式使得经典的硬件架构，也就是光I/Q调制和零差式相干检测架构，具有了新的功能，即同时产生和检测两路独立矢量射频信号的功能。The present invention uses the DSM technology that can convert any real signal into a digital sequence containing only +1 and -1, and combines software and hardware to enable the classic hardware architecture, that is, the optical I/Q modulation and homodyne coherent detection architecture, to have a new function, namely, the function of simultaneously generating and detecting two independent vector RF signals.

本发明中产生的两路矢量射频信号借助于DSM技术可以实现非常高阶的QAM调制，例如256QAM或者更高。The two-path vector radio frequency signals generated in the present invention can realize very high-order QAM modulation, such as 256QAM or higher, by means of DSM technology.

本发明中产生的两路矢量射频信号可以有不同的载波频率，不同的QAM调制格式，不同的波特率。The two-path vector radio frequency signals generated in the present invention may have different carrier frequencies, different QAM modulation formats, and different baud rates.

本发明中产生的两路矢量射频信号可以均采用单载波形式或OFDM形式，或者一路单载波另一路OFDM。The two vector radio frequency signals generated in the present invention may both be in a single carrier form or an OFDM form, or one may be a single carrier and the other OFDM.

本发明上述1-5的特性使得系统具有很强的灵活性。The above characteristics 1-5 of the present invention make the system highly flexible.

本发明避免了光偏振复用和光偏振分集的使用，从而极大地简化了系统架构并增加了系统的稳定性。The present invention avoids the use of optical polarization multiplexing and optical polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system.

附图说明BRIEF DESCRIPTION OF THE DRAWINGS

图1 是本发明提出的采用DSM技术以及经典的光I/Q调制和零差式相干检测架构实现双矢量射频信号同时产生和检测的系统示意图。FIG1 is a schematic diagram of a system proposed by the present invention for realizing simultaneous generation and detection of dual-vector RF signals by using DSM technology and classic optical I/Q modulation and homodyne coherent detection architecture.

图中标号：1-第一数字矢量基带信号产生模块；2-第二数字矢量基带信号产生模块；3-频率为

Figure SMS_36
的数字本振源；4-频率为
Figure SMS_37
的数字本振源；5-第一数字混频器；6-第二数字混频器；7-中心频率为
Figure SMS_38
的数字带通DSM模块；8-中心频率为
Figure SMS_39
的数字带通DSM模块；9-数模转换器；10-第一电放大器；11-第二电放大器；12-I/Q调制器；13-单模激光器；14-掺铒光纤放大器；15-单模光纤；16-零差式相干接收机；17-光本振源；18-模数转换器；19-数字QPSK恢复和解调模块；20-中心频率为
Figure SMS_40
的带通滤波器；21-中心频率为
Figure SMS_41
的带通滤波器；22-第一数字矢量基带信号解调模块；23-第二数字矢量基带信号解调模块。Numbers in the figure: 1-first digital vector baseband signal generating module; 2-second digital vector baseband signal generating module; 3-frequency
Figure SMS_36
Digital local oscillator source; 4-frequency is
Figure SMS_37
5- first digital mixer; 6- second digital mixer; 7- center frequency is
Figure SMS_38
Digital bandpass DSM module; 8-center frequency is
Figure SMS_39
digital bandpass DSM module; 9-digital-to-analog converter; 10-first electrical amplifier; 11-second electrical amplifier; 12-I/Q modulator; 13-single-mode laser; 14-erbium-doped fiber amplifier; 15-single-mode fiber; 16-homodyne coherent receiver; 17-optical local oscillator source; 18-analog-to-digital converter; 19-digital QPSK recovery and demodulation module; 20-center frequency
Figure SMS_40
Bandpass filter; 21- center frequency is
Figure SMS_41
Bandpass filter; 22-first digital vector baseband signal demodulation module; 23-second digital vector baseband signal demodulation module.

图2为在具体的实施例子中DSM前后的24GHz信号频谱。FIG. 2 is a 24 GHz signal spectrum before and after DSM in a specific implementation example.

图3为在具体的实施例子中DSM前后的28GHz信号频谱。FIG. 3 is a 28 GHz signal spectrum before and after DSM in a specific implementation example.

图4为在具体的实施例子中I/Q调制器的输出光谱。FIG. 4 is an output spectrum of an I/Q modulator in a specific implementation example.

图5为在具体的实施例子中接收到的DSM后的24GHz信号频谱，图5中的插图为在具体的实施例子中恢复出的16QAM星座图。FIG. 5 is a spectrum of a 24 GHz signal after DSM received in a specific implementation example, and the illustration in FIG. 5 is a 16QAM constellation diagram restored in the specific implementation example.

图6为在具体的实施例子中接收到的DSM后的28GHz信号频谱。图5中的插图为在具体的实施例子中恢复出的256QAM星座图。Fig. 6 is a spectrum of a 28 GHz signal after DSM received in a specific implementation example. The illustration in Fig. 5 is a 256QAM constellation diagram recovered in a specific implementation example.

实施方式Implementation

下面结合具体实施例子，并且参照附图，对本发明进一步详细说明。The present invention will be further described in detail below in conjunction with specific implementation examples and with reference to the accompanying drawings.

图1为采用DSM技术以及经典的光I/Q调制和零差式相干检测架构实现双矢量射频信号同时产生和检测的系统示意图，它包括：FIG1 is a schematic diagram of a system for realizing simultaneous generation and detection of dual-vector RF signals using DSM technology and classic optical I/Q modulation and homodyne coherent detection architecture, which includes:

第一数字矢量基带信号产生模块1用于产生数字矢量基带信号s1。然后，借助于频率为

Figure SMS_42
的数字本振源3和数字混频器5，数字矢量基带信号s1被上变频成载波频率为
Figure SMS_43
的数字矢量射频信号。然后，载波频率为
Figure SMS_44
的数字矢量射频信号经由中心频率为
Figure SMS_45
的数字带通DSM模块7被转换成一个只含有+1和-1的数字序列s1 * 。The first digital vector baseband signal generating module 1 is used to generate a digital vector baseband signal s1 . Then, with the help of a frequency
Figure SMS_42
The digital local oscillator source 3 and the digital mixer 5 are used to up-convert the digital vector baseband signal s1 into a carrier frequency of
Figure SMS_43
The digital vector RF signal is then
Figure SMS_44
The digital vector RF signal is transmitted through the center frequency
Figure SMS_45
The digital bandpass DSM module 7 is converted into a digital sequence s1 * containing only +1 and -1.

与此同时，第二数字矢量基带信号产生模块2用于产生数字矢量基带信号s2。然后，借助于频率为

Figure SMS_46
的数字本振源4和数字混频器6，数字矢量基带信号s2被上变频成载波频率为
Figure SMS_47
的数字矢量射频信号。然后，载波频率为
Figure SMS_48
的数字矢量射频信号经由中心频率为
Figure SMS_49
的数字带通DSM模块8被转换成一个只含有+1和-1的数字序列s2 * 。 At the same time, the second digital vector baseband signal generating module 2 is used to generate a digital vector baseband signal s2 . Then, with the help of a frequency
Figure SMS_46
The digital local oscillator source 4 and the digital mixer 6 are used to up-convert the digital vector baseband signal s2 into a carrier frequency of
Figure SMS_47
The digital vector RF signal is then
Figure SMS_48
The digital vector RF signal is transmitted through the center frequency
Figure SMS_49
The digital bandpass DSM module 8 is converted into a digital sequence s2 * containing only +1 and -1 .

在具体的实施例子中，s1是8Gb/s (2Gbaud)的单载波16QAM信号，

Figure SMS_50
等于24GHz；s2是8Gb/s (1Gbaud)的单载波256QAM信号，
Figure SMS_51
等于28GHz。中心频率为
Figure SMS_52
的数字带通DSM模块7和中心频率为
Figure SMS_53
的数字带通DSM模块8的过采样率分别设置为32和64。数字序列s1 * 和s2 * 具有相同的速率128Gb/s。图2为在具体的实施例子中DSM前后的24GHz信号频谱。图3为在具体的实施例子中DSM前后的28GHz信号频谱。In a specific implementation example, s1 is a single-carrier 16QAM signal of 8 Gb/s (2 Gbaud),
Figure SMS_50
= 24GHz; s2 is a single-carrier 256QAM signal at 8Gb/s (1Gbaud),
Figure SMS_51
Equal to 28GHz. The center frequency is
Figure SMS_52
The digital bandpass DSM module 7 and the center frequency are
Figure SMS_53
The oversampling rates of the digital bandpass DSM module 8 are set to 32 and 64 respectively . The digital sequences s1 * and s2 * have the same rate of 128Gb/s. FIG2 is a 24GHz signal spectrum before and after DSM in a specific implementation example. FIG3 is a 28GHz signal spectrum before and after DSM in a specific implementation example.

然后，双路数模转换器9用于实现具有相同速率的数字序列s1 * 和s2 * 从数字域到模拟域的转换，从而为I/Q调制器12提供I路和Q路的驱动输入。第一电放大器10和第二电放大器11分别用于放大I/Q调制器12的I路和Q路的驱动输入。在具体的实施例子中，数模转换器的采样率设置为128GSa/s。Then, the dual-channel digital-to-analog converter 9 is used to realize the conversion of the digital sequences s1 * and s2 * with the same rate from the digital domain to the analog domain, thereby providing the driving inputs of the I and Q channels for the I/Q modulator 12. The first electrical amplifier 10 and the second electrical amplifier 11 are respectively used to amplify the driving inputs of the I and Q channels of the I/Q modulator 12. In a specific implementation example, the sampling rate of the digital-to-analog converter is set to 128GSa/s.

然后，单模激光器13用于为I/Q调制器12提供工作频率为

Figure SMS_54
的连续波长的光载波输入。I/Q调制器12用于实现基带光QPSK调制以生成一个等效基带光QPSK信号，该等效基带光QPSK信号同时包含载波频率为
Figure SMS_55
的携带矢量信号s1的光射频波和载波频率为
Figure SMS_56
的携带矢量信号s2的光射频波。在具体的实施例子中，
Figure SMS_57
等于193.1THz。图4为在具体的实施例子中I/Q调制器的输出光谱。Then, the single-mode laser 13 is used to provide the I/Q modulator 12 with an operating frequency of
Figure SMS_54
The I/Q modulator 12 is used to implement baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal, which also includes a carrier frequency of
Figure SMS_55
The optical RF wave carrying the vector signal s1 and the carrier frequency are
Figure SMS_56
An optical radio frequency wave carrying a vector signal s2 . In a specific implementation example,
Figure SMS_57
Equal to 193.1 THz . FIG4 is an output spectrum of the I/Q modulator in a specific implementation example.

然后，生成的等效基带光QPSK信号经掺铒光纤放大器14放大后被送入具有一定长度的单模光纤15中进行传输，然后再被送入零差式相干接收机16，零差式相干接收机所采用的光本振源17的工作频率是

Figure SMS_58
。Then, the generated equivalent baseband optical QPSK signal is amplified by an erbium-doped fiber amplifier 14 and sent to a single-mode optical fiber 15 of a certain length for transmission, and then sent to a homodyne coherent receiver 16. The operating frequency of the optical local oscillator 17 used by the homodyne coherent receiver is
Figure SMS_58
.

然后，经由零差式相干接收机16检测出来的I路和Q路电信号经由模数转换器18处理后，被进一步送入到数字QPSK恢复和解调模块19中以恢复出发送的数字序列s1 * 和s2 *。图5为在具体的实施例子中接收到的DSM后的24GHz信号频谱。图6为在具体的实施例子中接收到的DSM后的28GHz信号频谱。Then, the I-channel and Q-channel electrical signals detected by the homodyne coherent receiver 16 are processed by the analog-to-digital converter 18 and further sent to the digital QPSK recovery and demodulation module 19 to recover the transmitted digital sequences s1 * and s2 * . FIG5 is a spectrum of a 24 GHz signal after DSM received in a specific implementation example. FIG6 is a spectrum of a 28 GHz signal after DSM received in a specific implementation example.

最后，恢复出的数字序列s1 * 经由中心频率为

Figure SMS_59
的带通滤波器20滤波后便可以从中恢复出原始的矢量信号s1，恢复出的矢量信号s1经由第一数字矢量基带信号解调模块22处理后可以恢复出原始的比特流。Finally, the recovered digital sequence s1 * is
Figure SMS_59
The original vector signal s1 can be restored after filtering by the bandpass filter 20, and the restored vector signal s1 can be restored to the original bit stream after being processed by the first digital vector baseband signal demodulation module 22.

与此同时，恢复出的数字序列s2 *经由中心频率为

Figure SMS_60
的带通滤波器21滤波后便可以从中恢复出原始的矢量信号s2，恢复出的矢量信号s2经由第二数字矢量基带信号解调模块23处理后可以恢复出原始的比特流。At the same time, the recovered digital sequence s2 * is
Figure SMS_60
The original vector signal s2 can be restored after filtering by the bandpass filter 21, and the restored vector signal s2 can be restored to the original bit stream after being processed by the second digital vector baseband signal demodulation module 23.

图5中的插图为在具体的实施例子中恢复出的16QAM星座图。图6中的插图为在具体的实施例子中恢复出的256QAM星座图。The illustration in Fig. 5 is a 16QAM constellation diagram restored in a specific implementation example. The illustration in Fig. 6 is a 256QAM constellation diagram restored in a specific implementation example.

总之，本发明所述的采用DSM技术以及经典的光I/Q调制和零差式相干检测架构的方法和系统，可以实现不同载波频率的、不同调制格式的、不同波特率的、两路独立的矢量射频信号的产生和检测，从而增强了系统的灵活性；避免了光偏振复用和光偏振分集的使用，从而极大地简化了系统架构并增加了系统的稳定性。本发明所述的采用DSM技术以及经典的光I/Q调制和零差式相干检测架构实现双矢量射频信号同时产生和检测的方法和系统，适合于不同调制格式、不同波特率以及不同载波频率复用的MIMO型光载无线通信。In summary, the method and system of the present invention using DSM technology and the classic optical I/Q modulation and homodyne coherent detection architecture can realize the generation and detection of two independent vector RF signals with different carrier frequencies, different modulation formats, and different baud rates, thereby enhancing the flexibility of the system; avoiding the use of optical polarization multiplexing and optical polarization diversity, thereby greatly simplifying the system architecture and increasing the stability of the system. The method and system of the present invention using DSM technology and the classic optical I/Q modulation and homodyne coherent detection architecture to realize the simultaneous generation and detection of dual vector RF signals are suitable for MIMO optical wireless communications with different modulation formats, different baud rates, and different carrier frequency multiplexing.

以上所述的具体描述，对发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施例而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。The specific description above further illustrates the purpose, technical solutions and beneficial effects of the invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims (5)

1.一种双光子矢量射频信号产生方法，其特征在于：包括如下步骤：1. A two-photon vector radio frequency signal generation method, characterized in that it comprises the following steps: 步骤一、利用数字信号处理产生两个相互独立的数字矢量基带信号s1和s2；然后经由上变频处理和数字带通DSM得到数字序列s1 * 和s2 * ；Step 1: Generate two independent digital vector baseband signals s1 and s2 by digital signal processing; then obtain digital sequences s1 * and s2 * by up-conversion processing and digital bandpass DSM; 结合频率为
Figure QLYQS_1
的数字本振源和数字混频器，将数字矢量基带信号s1进行上变频处理，得到载波频率为
Figure QLYQS_2
的数字矢量射频信号；然后经由中心频率为
Figure QLYQS_3
的数字带通DSM转换成一个只含有+1和-1的数字序列s1 * ；与此同时，结合频率为
Figure QLYQS_4
的数字本振源和数字混频器，将数字矢量基带信号s2进行上变频处理，得到载波频率为
Figure QLYQS_5
的数字矢量射频信号；然后经由中心频率为
Figure QLYQS_6
的数字带通DSM转换成一个只含有+1和-1的数字序列s2 * ；The binding frequency is
Figure QLYQS_1
The digital local oscillator source and digital mixer are used to up-convert the digital vector baseband signal s1 to obtain a carrier frequency of
Figure QLYQS_2
The digital vector RF signal is then transmitted through the center frequency
Figure QLYQS_3
The digital bandpass DSM is converted into a digital sequence s1 * containing only +1 and -1; at the same time, the combined frequency is
Figure QLYQS_4
The digital local oscillator source and digital mixer are used to up-convert the digital vector baseband signal s2 to obtain a carrier frequency of
Figure QLYQS_5
The digital vector RF signal is then transmitted through the center frequency
Figure QLYQS_6
The digital bandpass DSM is converted into a digital sequence s2 * containing only +1 and -1; 步骤二、具有相同速率的数字序列s1 * 和s2 * 被分别送入同一数模转换器的同相I和正交相Q输入口；数模转换器的同相I和正交相Q输出分别经驱动放大器放大后用来驱动光I/Q调制器，以调制来自单模激光器的工作频率为
Figure QLYQS_7
的连续波长的光载波，用于实现基带光QPSK调制，得到等效基带光QPSK信号；Step 2: The digital sequences s1 * and s2 * with the same rate are respectively sent to the in-phase I and quadrature-phase Q input ports of the same digital-to-analog converter; the in-phase I and quadrature-phase Q outputs of the digital-to-analog converter are respectively amplified by the driving amplifier and used to drive the optical I/Q modulator to modulate the operating frequency of the single-mode laser.
Figure QLYQS_7
The continuous wavelength optical carrier is used to implement baseband optical QPSK modulation to obtain an equivalent baseband optical QPSK signal; 所述等效基带光QPSK信号同时包含两个光射频波，其中一个是载波频率为
Figure QLYQS_8
的携带矢量信号s1的光射频波；另一个是载波频率为
Figure QLYQS_9
的携带矢量信号s2的光射频波；即产生双光子矢量射频信号；The equivalent baseband optical QPSK signal contains two optical radio frequency waves, one of which has a carrier frequency of
Figure QLYQS_8
The optical RF wave carrying the vector signal s1 ; the other is the carrier frequency
Figure QLYQS_9
An optical radio frequency wave carrying a vector signal s2 ; that is, a two-photon vector radio frequency signal is generated; 步骤三、生成的等效基带光QPSK信号经掺铒光纤放大器放大并在长度为L的单模光纤中传输后，被送入零差式相干接收机；所述零差式相干接收机所采用的光本振源的工作频率是
Figure QLYQS_10
，工作频率
Figure QLYQS_11
与工作频率
Figure QLYQS_12
相同；Step 3: The generated equivalent baseband optical QPSK signal is amplified by an erbium-doped fiber amplifier and transmitted in a single-mode optical fiber with a length of L, and then sent to a homodyne coherent receiver; the operating frequency of the optical local oscillator source used by the homodyne coherent receiver is
Figure QLYQS_10
, operating frequency
Figure QLYQS_11
With the operating frequency
Figure QLYQS_12
same; 步骤四、零差式相干接收机检测出来的I路和Q路电信号经由模数转换器处理后，再利用QPSK恢复和解调算法恢复出发送的数字序列s1 * 和s2 * ；Step 4: After the I-channel and Q-channel electrical signals detected by the homodyne coherent receiver are processed by an analog-to-digital converter, the transmitted digital sequences s1 * and s2 * are recovered using a QPSK recovery and demodulation algorithm; 恢复出的数字序列s1 * 经由中心频率为
Figure QLYQS_13
的带通滤波器滤波后，从中恢复出原始的矢量信号s1；同理，恢复出的数字序列s2 * 经由一个中心频率为
Figure QLYQS_14
的带通滤波器滤波后，从中恢复出原始的矢量信号s2。The recovered digital sequence s1 * has a center frequency of
Figure QLYQS_13
After filtering with a bandpass filter, the original vector signal s1 is recovered; similarly, the recovered digital sequence s2 * is filtered through a bandpass filter with a center frequency of
Figure QLYQS_14
After filtering with a bandpass filter, the original vector signal s2 is restored. 2.如权利要求1所述一种双光子矢量射频信号产生方法，其特征在于：2. A two-photon vector radio frequency signal generation method as claimed in claim 1, characterized in that: 所述长度L的计算方法为：The length L is calculated as follows:
Figure QLYQS_15
，
Figure QLYQS_15
, 其中，L是光纤传输长度，
Figure QLYQS_16
是单模激光器的工作频率，c是光在真空中的传播速度，B是等效基带光QPSK信号的波特率，D是光纤色散系数，
Figure QLYQS_17
是双矢量射频信号载频之差的绝对值。Where L is the fiber transmission length,
Figure QLYQS_16
is the operating frequency of the single-mode laser, c is the propagation speed of light in a vacuum, B is the baud rate of the equivalent baseband optical QPSK signal, D is the fiber dispersion coefficient,
Figure QLYQS_17
It is the absolute value of the difference between the carrier frequencies of the dual-vector RF signals. 3.如权利要求1所述一种双光子矢量射频信号产生方法，其特征在于：所述两个相互独立的数字矢量基带信号具有相同或不同的波特率，并采用相同或不同的矢量调制格式；所述调制格式包括正交相移键控、8阶正交幅度调制、16阶正交幅度调制、64阶正交幅度调制、128阶正交幅度调制、256阶正交幅度调制、512阶正交幅度调制。3. A two-photon vector RF signal generation method as described in claim 1, characterized in that: the two independent digital vector baseband signals have the same or different baud rates and adopt the same or different vector modulation formats; the modulation formats include orthogonal phase shift keying, 8th order orthogonal amplitude modulation, 16th order orthogonal amplitude modulation, 64th order orthogonal amplitude modulation, 128th order orthogonal amplitude modulation, 256th order orthogonal amplitude modulation, and 512th order orthogonal amplitude modulation. 4.如权利要求1所述一种双光子矢量射频信号产生方法，其特征在于：4. A two-photon vector radio frequency signal generation method as claimed in claim 1, characterized in that: 所述两个独立的数字矢量基带信号均采用单载波调制或OFDM调制；The two independent digital vector baseband signals both adopt single carrier modulation or OFDM modulation; 或所述两个独立的数字矢量基带信号一路采用单载波调制，另一路采用OFDM调制。Or one of the two independent digital vector baseband signals is modulated by a single carrier, and the other is modulated by OFDM. 5.实现如权利要求1所述一种双光子矢量射频信号产生方法的装置，其特征在于：包括：5. A device for implementing a two-photon vector radio frequency signal generation method as claimed in claim 1, characterized in that it comprises: 两个数字矢量基带信号产生模块，用于产生两个独立的数字矢量基带信号s1和s2；Two digital vector baseband signal generating modules, used to generate two independent digital vector baseband signals s1 and s2 ; 两组数字本振源和数字混频器，其中一组频率为
Figure QLYQS_18
的数字本振源和对应的数字混频器用于将数字矢量基带信号s1上变频成载波频率为
Figure QLYQS_19
的数字矢量射频信号；另一组频率为
Figure QLYQS_20
的数字本振源和对应的数字混频器用于将数字矢量基带信号s2上变频成载波频率为
Figure QLYQS_21
的数字矢量射频信号；Two sets of digital local oscillator sources and digital mixers, one of which has a frequency of
Figure QLYQS_18
The digital local oscillator source and the corresponding digital mixer are used to up-convert the digital vector baseband signal s1 into a carrier frequency of
Figure QLYQS_19
The digital vector RF signal of
Figure QLYQS_20
The digital local oscillator source and the corresponding digital mixer are used to up-convert the digital vector baseband signal s2 into a carrier frequency of
Figure QLYQS_21
Digital vector RF signal; 两个数字带通DSM模块，其中中心频率为
Figure QLYQS_22
的数字带通DSM模块将载波频率为
Figure QLYQS_23
的数字矢量射频信号转换成一个只含有+1和-1的数字序列s1 * ，中心频率为
Figure QLYQS_24
的数字带通DSM模块将载波频率为
Figure QLYQS_25
的数字矢量射频信号转换成一个只含有+1和-1的数字序列s2 * ；Two digital bandpass DSM modules with center frequencies of
Figure QLYQS_22
The digital bandpass DSM module converts the carrier frequency to
Figure QLYQS_23
The digital vector RF signal is converted into a digital sequence s1 * containing only +1 and -1, with a center frequency of
Figure QLYQS_24
The digital bandpass DSM module converts the carrier frequency to
Figure QLYQS_25
The digital vector RF signal is converted into a digital sequence s2 * containing only +1 and -1; 数模转换器，用于实现具有相同速率的数字序列s1 * 和s2 * 从数字域到模拟域的转换，s1 * 和s2 * 被分别送入同一数模转换器的同相I和正交相Q输入口，从而为I/Q调制器提供I路和Q路的驱动输入；A digital-to-analog converter, used for realizing conversion of digital sequences s1 * and s2 * with the same rate from the digital domain to the analog domain. s1 * and s2 * are respectively sent to the in-phase I and quadrature-phase Q input ports of the same digital-to-analog converter, thereby providing driving inputs of I and Q channels for the I/Q modulator; 两个电放大器，分别用于放大I/Q调制器I路和Q路的驱动输入；Two electrical amplifiers, used for respectively amplifying the driving inputs of the I and Q paths of the I/Q modulator; 单模激光器，用于为I/Q调制器提供工作频率为
Figure QLYQS_26
的连续波长的光载波输入；Single-mode laser, used to provide the I/Q modulator with an operating frequency of
Figure QLYQS_26
Continuous wavelength optical carrier input; I/Q调制器，用于实现基带光QPSK调制以生成一个等效基带光QPSK信号，所述等效基带光QPSK信号同时包含载波频率为
Figure QLYQS_27
的携带矢量信号s1的光射频波以及载波频率为
Figure QLYQS_28
的携带矢量信号s2的光射频波；The I/Q modulator is used to implement baseband optical QPSK modulation to generate an equivalent baseband optical QPSK signal, wherein the equivalent baseband optical QPSK signal also includes a carrier frequency of
Figure QLYQS_27
The optical RF wave carrying the vector signal s1 and the carrier frequency are
Figure QLYQS_28
An optical radio frequency wave carrying a vector signal s2 ; 掺铒光纤放大器，用于放大生成的等效基带光QPSK信号；An erbium-doped fiber amplifier is used to amplify the generated equivalent baseband optical QPSK signal; 单模光纤，用于传输生成的等效基带光QPSK信号；Single-mode optical fiber, used to transmit the generated equivalent baseband optical QPSK signal; 零差式相干接收机和工作频率为
Figure QLYQS_29
的光本振源，用于对接收到的等效基带光QPSK信号进行零差检测，检测得到的I路和Q路电信号被送入到模数转换器中；Homodyne coherent receiver and the operating frequency is
Figure QLYQS_29
The optical local oscillator source is used to perform homodyne detection on the received equivalent baseband optical QPSK signal, and the I-channel and Q-channel electrical signals obtained by the detection are sent to the analog-to-digital converter; 模数转换器，用于实现对经由零差检测得到的I路和Q路电信号从模拟域到数字域的转换；An analog-to-digital converter, used for converting the I-channel and Q-channel electrical signals obtained by homodyne detection from an analog domain to a digital domain; 数字QPSK恢复和解调模块，用于从零差检测得到的I路和Q路信号中恢复出发送的数字序列s1 * 和s2 * ；A digital QPSK recovery and demodulation module, used to recover the transmitted digital sequences s1 * and s2 * from the I-channel and Q-channel signals obtained by homodyne detection; 两个数字带通滤波器，其中一个中心频率为
Figure QLYQS_30
的带通滤波器用于从恢复出的数字序列s1 * 中过滤出原始的矢量信号s1，另一个中心频率为
Figure QLYQS_31
的带通滤波器用于从恢复出的数字序列s2 * 中过滤出原始的矢量信号s2；Two digital bandpass filters, one with a center frequency of
Figure QLYQS_30
The bandpass filter is used to filter out the original vector signal s1 from the restored digital sequence s1 * , and the other one with a center frequency of
Figure QLYQS_31
The bandpass filter is used to filter out the original vector signal s2 from the restored digital sequence s2 * ; 两个数字矢量基带信号解调模块，用于恢复出原始的发送比特流。Two digital vector baseband signal demodulation modules are used to recover the original transmitted bit stream.
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