WO2017128311A1 - Signal processing method, apparatus and system - Google Patents

Abstract

The present invention relates to the technical field of communications. Provided in embodiments of the present invention are a signal processing method, apparatus and system, capable of reducing bandwidth of a signal transmitted by a transmitting terminal device, and reducing system costs. The signal processing method comprises: a communication device acquiring a first symbol sequence to be transmitted, the number of levels of said first symbol sequence being M, and M ≥ 2; the communication device delaying said first symbol sequence to be transmitted by N number of first symbol periods, thus generating a second symbol sequence, said first symbol period being the length of time between any two adjacent symbols in said first symbol sequence, and N ≥ 1; according to said first symbol sequence to be transmitted and said second symbol sequence, the communication device determining a third symbol sequence, the bandwidth of said third symbol sequence being smaller than the bandwidth of said first symbol sequence to be transmitted; the communication device performing digital-to-analog conversion on said third symbol sequence, thus generating a first analog signal, and transmitting said first analog signal.

Description

一种信号处理方法、装置及***Signal processing method, device and system 技术领域Technical field

本发明涉及通信领域，尤其涉及一种信号处理方法、装置及***。The present invention relates to the field of communications, and in particular, to a signal processing method, apparatus, and system.

背景技术Background technique

随着通信技术的不断发展，短距离光通信***也迎来了高速发展时期。在短距离光通信***中，为了实现高速大容量传输，发送端设备一般使用直接调制——DD(Direct Detection，直接检测)技术对待传输符号序列进行调制。With the continuous development of communication technology, short-distance optical communication systems have also ushered in a period of rapid development. In short-range optical communication systems, in order to achieve high-speed and large-capacity transmission, the transmitting device generally uses direct modulation, DD (Direct Detection) technology, to modulate the transmitted symbol sequence.

通常情况下，短距离光通信***中的发送端设备主要使用PAM4(Four-level Pulse Amplitude Modulation，四电平脉冲幅度调制)技术对待传输符号序列进行调制，以生成已调符号序列。已调符号序列在经过数模转换、电光信号转换等一系列处理后，发送端设备将处理后的信号向对端设备发送。但是，利用PAM4技术生成的已调符号序列的带宽较大，使得发送端设备发送的信号在标准单模光纤信道中传输时抗色散能力较差。Generally, the transmitting device in the short-range optical communication system mainly uses PAM4 (Four-level Pulse Amplitude Modulation) technology to modulate the transmitted symbol sequence to generate a modulated symbol sequence. After the modulated symbol sequence undergoes a series of processing such as digital-to-analog conversion and electro-optical signal conversion, the transmitting device transmits the processed signal to the opposite device. However, the bandwidth of the modulated symbol sequence generated by the PAM4 technology is large, so that the signal transmitted by the transmitting device is less resistant to dispersion when transmitted in a standard single-mode fiber channel.

目前，为了减少已调符号序列的带宽，发送端设备利用携带至少3个抽头的RRC(Raised Root Cosine，根升余弦)滤波器对已调符号序列进行过滤，以减小已调符号序列的带宽。RRC滤波器通过调节抽头系数可以实现不同的滤波效果，且RRC滤波器携带的抽头数量越多，其滤波效果越好，经由RCC滤波器处理后的符号序列的带宽会越小。但是，随着抽头数量的增加，RRC的实现结构会越来越复杂，成本也会相应变高。Currently, in order to reduce the bandwidth of the modulated symbol sequence, the transmitting device filters the modulated symbol sequence by using an RRC (Raised Root Cosine) filter carrying at least 3 taps to reduce the bandwidth of the modulated symbol sequence. . The RRC filter can achieve different filtering effects by adjusting the tap coefficients, and the more the number of taps carried by the RRC filter, the better the filtering effect, and the smaller the bandwidth of the symbol sequence processed by the RCC filter. However, as the number of taps increases, the implementation structure of RRC will become more and more complex and the cost will increase accordingly.

发明内容Summary of the invention

本发明的实施例提供一种信号处理方法、装置及***，减少了发送端设备发送的信号的带宽，同时降低了***成本。Embodiments of the present invention provide a signal processing method, apparatus, and system that reduce the bandwidth of a signal transmitted by a transmitting device while reducing system cost.

为达到上述目的，本发明的实施例采用如下技术方案： In order to achieve the above object, embodiments of the present invention adopt the following technical solutions:

本发明实施例提供一种预编码器，包括延时单元和与所述延时单元连接的处理单元。An embodiment of the present invention provides a precoder including a delay unit and a processing unit connected to the delay unit.

具体的，所述延时单元，用于接收第一符号序列，且将所述第一符号序列延时N个第一符号周期，以生成第二符号序列，并向所述处理单元发送所述第二符号序列，所述第一符号序列的电平数量为M，所述第一符号周期为所述第一符号序列中任意两个相邻符号之间的时间长度，N≥1，M≥2。Specifically, the delay unit is configured to receive a first symbol sequence, and delay the first symbol sequence by N first symbol periods to generate a second symbol sequence, and send the a second symbol sequence, the number of levels of the first symbol sequence is M, and the first symbol period is a length of time between any two adjacent symbols in the first symbol sequence, N≥1, M≥ 2.

具体的，所述处理单元，用于接收所述第一符号序列和所述延时单元发送的第二符号序列，且根据所述第一符号序列和所述第二符号序列，生成第三符号序列，并将所述第三符号序列发送，所述第三符号序列的带宽小于所述第一符号序列的带宽。Specifically, the processing unit is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit, and generate a third symbol according to the first symbol sequence and the second symbol sequence. Sequences and transmitting the third sequence of symbols, the bandwidth of the third sequence of symbols being less than the bandwidth of the first sequence of symbols.

本发明实施例中，预编码器接收到的第一符号序列的电平数量为M，且M≥2，即第一符号序列是多电平符号序列，该第一符号序列的起伏变化比较剧烈，预编码器通过对第一符号序列的延时生成第二符号序列，并根据第一符号序列和第二序号序列确定出第三符号序列，能够有效降低第一符号序列的起伏变化，第三符号序列的起伏变化较为缓慢，使得第三符号序列的带宽小于第一符号序列的带宽，也就是说，本发明实施例提供的预编码器通过对第一符号序列的处理，能够有效降低第一符号序列的带宽。In the embodiment of the present invention, the number of levels of the first symbol sequence received by the precoder is M, and M≥2, that is, the first symbol sequence is a multi-level symbol sequence, and the fluctuation of the first symbol sequence is relatively severe. And the precoder generates a second symbol sequence by delaying the first symbol sequence, and determines the third symbol sequence according to the first symbol sequence and the second sequence sequence, which can effectively reduce the fluctuation of the first symbol sequence, and third The fluctuation of the symbol sequence is relatively slow, so that the bandwidth of the third symbol sequence is smaller than the bandwidth of the first symbol sequence. That is, the precoder provided by the embodiment of the present invention can effectively reduce the first by processing the first symbol sequence. The bandwidth of the symbol sequence.

进一步地，所述处理单元包括加法子单元和发送子单元，所述加法子单元与所述延时单元连接，所述加法子单元和所述发送子单元连接；其中，Further, the processing unit includes an adding subunit and a transmitting subunit, the adding subunit is connected to the delay unit, and the adding subunit is connected to the sending subunit;

所述加法子单元，用于接收所述第一符号序列和所述延时单元发送的第二符号序列，并将所述第一符号序列和所述第二符号序列相加，得到第三符号序列；The adding subunit is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit, and add the first symbol sequence and the second symbol sequence to obtain a third symbol sequence;

所述发送子单元，用于将所述加法子单元得到的所述第三符号序列发送。The sending subunit is configured to send the third symbol sequence obtained by the adding subunit.

本发明另一实施例提供一种通信设备，包括信号发生器，与所述信号发生器连接的符号调制器，以及数模转换器，与所述符号调 制器和所述数模转换器均连接的预编码器。Another embodiment of the present invention provides a communication device including a signal generator, a symbol modulator coupled to the signal generator, and a digital to analog converter, and the symbol modulation A precoder connected to both the controller and the digital to analog converter.

具体的，所述信号发生器，用于生成待传输的比特序列，并向所述符号调制器发送所述待传输的比特序列。Specifically, the signal generator is configured to generate a bit sequence to be transmitted, and send the bit sequence to be transmitted to the symbol modulator.

具体的，所述符号调制器，用于接收所述信号发生器发送的所述待传输的比特序列，且采用预设的脉冲幅度调制方式对所述待传输比特序列进行调制，以生成第一符号序列，并向所述预编码器发送所述第一符号序列，所述第一符号序列的电平数量为M，M≥2。Specifically, the symbol modulator is configured to receive the bit sequence to be transmitted sent by the signal generator, and modulate the bit sequence to be transmitted by using a preset pulse amplitude modulation manner to generate a first And symbolizing a sequence of symbols, and transmitting the first sequence of symbols to the precoder, the number of levels of the first sequence of symbols being M, M≥2.

具体的，所述预编码器，用于接收所述符号调制器发送的所述第一符号序列，且对所述第一符号序列进行编码，以生成第三符号序列，并向所述数模转换器发送所述第三符号序列，所述第三符号序列的带宽小于所述第一符号序列的带宽。Specifically, the precoder is configured to receive the first symbol sequence sent by the symbol modulator, and encode the first symbol sequence to generate a third symbol sequence, and to the digital model The converter transmits the third sequence of symbols, the bandwidth of the third sequence of symbols being less than the bandwidth of the first sequence of symbols.

具体的，所述数模转换器，用于接收所述预编码器发送的所述第三符号序列，且对所述第三符号序列进行数模转换，生成第一模拟信号，并将所述第一模拟信号发送。Specifically, the digital-to-analog converter is configured to receive the third symbol sequence sent by the precoder, and perform digital-to-analog conversion on the third symbol sequence to generate a first analog signal, and The first analog signal is sent.

本发明实施例提供的通信设备包括上一实施例描述的预编码器，通信设备在生成待传输的比特序列，并就待传输的比特序列调至为第一符号序列后，通信设备利用预编码器对第一符号序列进行编码，生成了带宽小于第一符号序列的第三符号序列，第三符号序列的带宽的减小使得通信设备发送的信号的带宽减小，实现了通信设备发送信号的带宽的减小，降低了通信设备的成本，且减小了色散对通信设备发送的信号的影响。The communication device provided by the embodiment of the present invention includes the precoder described in the previous embodiment. After the communication device generates the bit sequence to be transmitted, and adjusts the bit sequence to be transmitted to the first symbol sequence, the communication device uses the precoding. The device encodes the first symbol sequence to generate a third symbol sequence having a bandwidth smaller than the first symbol sequence, and the reduction of the bandwidth of the third symbol sequence reduces the bandwidth of the signal transmitted by the communication device, thereby realizing the signal transmitted by the communication device. The reduction in bandwidth reduces the cost of the communication device and reduces the effect of dispersion on the signals transmitted by the communication device.

进一步地，所述通信设备还包括与所述数模转换器连接的光调制器。Further, the communication device further includes a light modulator coupled to the digital to analog converter.

所述光调制器，用于接收所述数模转换器发送的第一模拟信号，将所述第一模拟信号转换为光信号，并将所述光信号经由光纤信道发送。The optical modulator is configured to receive a first analog signal sent by the digital-to-analog converter, convert the first analog signal into an optical signal, and send the optical signal via a fiber channel.

本发明另一实施例提供一种信号处理方法，通信设备在获取到待传输的电平数量为M的第一符号序列后，将所述待传输的第一符号序列延时N个第一符号周期，生成第二符号序列，所述第一符号 周期为所述第一符号序列中任意两个相邻符号之间的时间长度，N≥1，M≥2，然后，所述通信设备根据所述待传输的第一符号序列和所述第二符号序列，确定第三符号序列，所述第三符号序列的带宽小于所述待传输的第一符号序列的带宽，最后，所述通信设备对所述第三符号序列进行数模转换，生成第一模拟信号，并将所述第一模拟信号发送。Another embodiment of the present invention provides a signal processing method, after the communication device acquires a first symbol sequence of a level M to be transmitted, delays the first symbol sequence to be transmitted by N first symbols. a second symbol sequence, the first symbol a period is a length of time between any two adjacent symbols in the first sequence of symbols, N≥1, M≥2, and then the communication device is configured according to the first symbol sequence to be transmitted and the second a symbol sequence, determining a third symbol sequence, wherein a bandwidth of the third symbol sequence is smaller than a bandwidth of the first symbol sequence to be transmitted, and finally, the communication device performs digital-to-analog conversion on the third symbol sequence to generate a An analog signal and transmitting the first analog signal.

本发明实施例中的通信设备与上一实施例描述的通信设备相对应，通信设备在获取到待传输的第一符号序列后，利用预编码器对第一符号序列进行编码，生成了带宽小于第一符号序列的第三符号序列，第三符号序列的带宽的减小使得通信设备发送的信号的带宽减小，实现了通信设备发送信号的带宽的减小，降低了通信设备的成本，且减小了色散对通信设备发送的信号的影响。The communication device in the embodiment of the present invention corresponds to the communication device described in the previous embodiment. After acquiring the first symbol sequence to be transmitted, the communication device encodes the first symbol sequence by using a precoder, and generates a bandwidth smaller than The third symbol sequence of the first symbol sequence, the reduction of the bandwidth of the third symbol sequence reduces the bandwidth of the signal transmitted by the communication device, reduces the bandwidth of the signal transmitted by the communication device, and reduces the cost of the communication device, and The effect of dispersion on the signal transmitted by the communication device is reduced.

进一步地，所述通信设备根据所述待传输的第一符号序列和所述第二符号序列，确定第三符号序列，具体包括：所述通信设备将所述待传输的第一符号序列和所述第二符号序列相加，得到所述第三符号序列。Further, the communication device determines the third symbol sequence according to the first symbol sequence to be transmitted and the second symbol sequence, and specifically includes: the communication device to use the first symbol sequence and the to-be-transmitted The second symbol sequence is added to obtain the third symbol sequence.

进一步地，所述通信设备获取待传输的第一符号序列，具体包括：所述通信设备生成待传输比特序列；所述通信设备采用预设的脉冲幅度调制方式对所述待传输比特序列进行调制，得到所述待传输的第一符号序列。Further, the acquiring, by the communications device, the first symbol sequence to be transmitted, specifically includes: the communications device generating a bit sequence to be transmitted; and the communications device modulating the bit sequence to be transmitted by using a preset pulse amplitude modulation manner Obtaining the first symbol sequence to be transmitted.

进一步地，所述通信将所述第一模拟信号发送，包括：所述通信设备将所述第一模拟信号转换为光信号，并将所述光信号经由光纤信道发送。Further, the communication transmits the first analog signal, including: the communication device converts the first analog signal into an optical signal, and transmits the optical signal via a fiber channel.

本发明另一实施例提供一种信号处理***，包括如上述实施例中任意一项所述的通信设备以及与所述通信设备相对应的接收端设备，所述通信设备为发送端设备，所述通信设备和所述接收端设备之间通过光纤连接。Another embodiment of the present invention provides a signal processing system, including the communication device according to any one of the above embodiments, and a receiving device corresponding to the communication device, where the communication device is a transmitting device, The communication device and the receiving end device are connected by an optical fiber.

具体的，所述接收端设备，用于接收所述通信设备发送的光信号，对所述光信号进行光电转换，生成第二模拟信号，且对所述第 二模拟信号进行模数转换，生成第四符号序列，并对所述第四符号序列进行解码处理和均衡处理，生成第五符号序列。Specifically, the receiving end device is configured to receive an optical signal sent by the communications device, perform photoelectric conversion on the optical signal, generate a second analog signal, and The two analog signals are subjected to analog-to-digital conversion to generate a fourth symbol sequence, and the fourth symbol sequence is subjected to decoding processing and equalization processing to generate a fifth symbol sequence.

本发明实施例提供的信号处理***的技术效果可以参见上述实施例中通信设备执行的信号处理方法中描述的通信设备的技术效果，此处不再赘述。The technical effects of the signal processing system provided by the embodiment of the present invention can be referred to the technical effects of the communication device described in the signal processing method performed by the communication device in the foregoing embodiment, and details are not described herein again.

进一步地，所述接收端设备，具体用于将所述第四符号序列延时K个第二符号周期生成第六符号序列，且将所述第四符号序列和所述第六符号序列相加，得到所述第七符号序列，并对所述第七符号序列进行均衡处理，生成所述第五符号序列。Further, the receiving end device is specifically configured to delay the fourth symbol sequence by K second symbol periods to generate a sixth symbol sequence, and add the fourth symbol sequence and the sixth symbol sequence And obtaining the seventh symbol sequence, and performing equalization processing on the seventh symbol sequence to generate the fifth symbol sequence.

附图说明DRAWINGS

为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例。In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described. It is obvious that the drawings in the following description are only some embodiments of the present invention.

图1为传统短距离光通信***的结构示意图；1 is a schematic structural view of a conventional short-distance optical communication system;

图2为传统短距离通信***中待传输的符号序列的频谱图；2 is a frequency spectrum diagram of a symbol sequence to be transmitted in a conventional short-range communication system;

图3为包含RRC的短距离光通信***的结构示意图；3 is a schematic structural diagram of a short-range optical communication system including RRC;

图4为本发明实施例提供的预编码器的结构示意图一；4 is a schematic structural diagram 1 of a precoder according to an embodiment of the present invention;

图5为本发明实施例提供的预编码器的结构示意图二；FIG. 5 is a schematic structural diagram 2 of a precoder according to an embodiment of the present disclosure;

图6为本发明实施例提供的通信设备的结构示意图一；FIG. 6 is a schematic structural diagram 1 of a communication device according to an embodiment of the present disclosure;

图7为本发明实施例提供的通信设备的结构示意图二；FIG. 7 is a schematic structural diagram 2 of a communication device according to an embodiment of the present disclosure;

图8为本发明实施例提供的信号处理方法的流程示意图；FIG. 8 is a schematic flowchart diagram of a signal processing method according to an embodiment of the present invention;

图9为本发明实施例中第三符号序列的频谱图；9 is a frequency spectrum diagram of a third symbol sequence in an embodiment of the present invention;

图10为本发明实施例提供的短距离光通信***的结构示意图。FIG. 10 is a schematic structural diagram of a short-distance optical communication system according to an embodiment of the present invention.

具体实施方式detailed description

下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments.

本发明的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”和“第四”等是用于区别不同对象，而不是用于限定 特定顺序。此外，术语“包括”和“具有”以及它们任何变形，意图在于覆盖不排他的包含。例如包含了一系列步骤或单元的过程、方法、***、产品或设备没有限定于已列出的步骤或单元，而是可选地还包括没有列出的步骤或单元，或可选地还包括对于这些过程、方法、产品或设备固有的其它步骤或单元。The terms "first", "second", "third" and "fourth" and the like in the specification and claims of the present invention and the above drawings are used to distinguish different objects, and are not intended to be limited. Specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or alternatively Other steps or units inherent to these processes, methods, products or equipment.

以下描述中，为了说明而不是为了限定，提出了诸如特定***结构、接口、技术之类的具体细节，以便透切理解本发明。然而，本领域的技术人员应当清楚，在没有这些具体细节的其它实施例中也可以实现本发明。在其它情况中，省略对众所周知的移动设备、电路以及方法的详细说明，以免不必要的细节妨碍本发明的描述。In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known mobile devices, circuits, and methods are omitted so as not to obscure the description of the invention.

另外，本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。In addition, the term "and/or" herein is merely an association relationship describing an associated object, indicating that there may be three relationships, for example, A and/or B, which may indicate that A exists separately, and A and B exist at the same time. There are three cases of B alone. In addition, the character "/" in this article generally indicates that the contextual object is an "or" relationship.

如图1所示，传统的短距离光通信***中，发送端设备包含PAM4序列生成器、DAC(Digital To Analog Converter，数模转换器)和激光器，接收端设备包含PD(Photo Diode，光电二极管)、ADC(Analog To Digital Converter，模数转换器)和判决均衡器。As shown in FIG. 1 , in a conventional short-distance optical communication system, a transmitting device includes a PAM4 sequence generator, a DAC (Digital To Analog Converter), and a laser, and the receiving device includes a PD (Photo Diode). ), ADC (Analog To Digital Converter) and decision equalizer.

发送端设备生成待传输的比特序列{b₁,b₂,...b_n,...b_2n}，其中，n为正整数。PAM4序列发生器采用PAM4技术对{b₁,b₂,...b_n,...b_2n}进行调制，生成具有4种不同电平的待传输的符号序列{I₁,I₂,...I_n}，其中，PAM4序列发生器的输入信号与输出信号具有如下关系：The transmitting device generates a bit sequence {b ₁ , b ₂ , . . . b _n , . . . b _2n } to be transmitted, where n is a positive integer. The PAM4 sequencer modulates {b ₁ , b ₂ ,...b _n ,...b _2n } using the PAM4 technique to generate a symbol sequence {I ₁ , I ₂ , to be transmitted with 4 different levels. ...I _n }, wherein the input signal of the PAM4 sequencer has the following relationship with the output signal:

I_k＝2⁰*b_2k-1+2¹*b_2k；1≤k≤nI _k = 2 ⁰ * b _2k-1 + 2 ¹ * b _2k ; 1 ≤ k ≤ n

PAM4序列发生器将其生成的待传输的符号序列{I₁,I₂,...I_n}发送至DAC，DAC将{I₁,I₂,...I_n}转换为模拟信号D(t)，并将D(t)发送至激光器。激光器在接收到模拟信号D(t)后，对模拟信号D(t)进行光调制，生成光信号，并将生成的光信号耦合到光纤信道中传输。The PAM4 sequencer sends its generated symbol sequence {I ₁ , I ₂ , ... I _n } to the DAC, and the DAC converts {I ₁ , I ₂ , ... I _n } into an analog signal D. (t) and send D(t) to the laser. After receiving the analog signal D(t), the laser optically modulates the analog signal D(t) to generate an optical signal, and couples the generated optical signal into a fiber channel for transmission.

接收端设备在接收到发送端设备发送的光信号后，光电二极管首先将接收到的光信号转换成有效的电信号R(t)，并将R(t)发送至 ADC，ADC对R(t)进行模数转换生成符号序列{v′₁,v'₂,...v'_n}，也可以说，ADC对R(t)按照一定的采样频率采样，生成符号序列{v′₁,v'₂,...v'_n}，ADC在生成符号序列{v′₁,v'₂,...v'_n}后，将符号序列{v′₁,v'₂,...v'_n}发送至判决均衡器，判决均衡器对{v′₁,v'₂,...v'_n}进行均衡，判决，输出最终的接收序列{I′₁,I'₂,...I'_n}。After receiving the optical signal sent by the transmitting device, the photodiode first converts the received optical signal into a valid electrical signal R(t), and sends R(t) to the ADC, and the ADC pairs R(t). Performing analog-to-digital conversion to generate symbol sequences {v' ₁ , v' ₂ , ... v' _n }, it can also be said that the ADC samples R(t) according to a certain sampling frequency to generate a symbol sequence {v' ₁ . _{v '2, ... v' n} }, ADC generated symbol sequence _{{v '1, v' 2} , ... v 'n} , the sequence of symbols _{{v' 1, v '2} , ... V' _n } is sent to the decision equalizer, and the decision equalizer equalizes {v' ₁ , v' ₂ , ... v' _n }, decides, and outputs the final received sequence {I' ₁ , I' ₂ , . ..I' _n }.

发送端设备发送待传输的比特序列时，采用PAM4技术调制{b₁,b₂,...b_n,...b_2n}生成了待传输的符号序列{I₁,I₂,...I_n}，该符号序列的带宽的数值与符号速率的数值相等。为了实现高速传输，在近距离光通信***中的符号速率大部分都很高，因此，采用PAM4技术生成的待传输的符号序列{I₁,I₂,...I_n}的带宽也较大。When the transmitting device sends the bit sequence to be transmitted, the PAM4 technology modulation {b ₁ , b ₂ , . . . b _n , . . . b _2n } generates the symbol sequence to be transmitted {I ₁ , I ₂ , .. .I _n }, the value of the bandwidth of the symbol sequence is equal to the value of the symbol rate. In order to achieve high-speed transmission, the symbol rate in the short-range optical communication system is mostly high. Therefore, the bandwidth of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted generated by the PAM4 technology is also higher. Big.

示例性的，待传输的符号序列{I₁,I₂,...I_n}的符号速率为25Gbs，即吉比特每秒，图2示出了待传输的符号序列{I₁,I₂,...I_n}的频谱图。图2中横轴代表频率f，纵轴代表振幅的对数Magnitude(大小)。从图2可以看出，待传输的符号序列{I₁,I₂,...I_n}的主瓣带宽为25GHz，即待传输的符号序列{I₁,I₂,...I_n}的主瓣带宽的数值与待传输的符号序列{I₁,I₂,...I_n}的符号速率的数值相等。Exemplarily, the symbol rate of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted is 25 Gbs, ie gigabits per second, and FIG. 2 shows the symbol sequence {I ₁ , I ₂ to be transmitted. , ... I _n } spectrum diagram. In Fig. 2, the horizontal axis represents the frequency f, and the vertical axis represents the logarithmic Magnitude of the amplitude. It can be seen from Fig. 2 that the main lobe bandwidth of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted is ₂₅ GHz, that is, the symbol sequence to be transmitted {I ₁ , I ₂ , ... I _n The value of the main lobe bandwidth of } is equal to the value of the symbol rate of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted.

待传输的符号序列{I₁,I₂,...I_n}的带宽较大，使得发送端设备发送的信号在标准单模光纤信道中传输时抗色散能力较差，且发送端设备发送的信号在传输一定距离后，色散对该信号的影响较为严重，导致该信号发生畸变，误码率较大。The bandwidth of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted is large, so that the signal transmitted by the transmitting device is poor in anti-dispersion capability when transmitted in a standard single-mode fiber channel, and the transmitting device transmits After the signal is transmitted for a certain distance, the influence of the dispersion on the signal is serious, resulting in distortion of the signal and a large error rate.

另外，由于待传输的符号序列{I₁,I₂,...I_n}的带宽较大，因此需要能够支持更大带宽的设备来传输已调符号序列，而设备支持的带宽越大，其成本越高，使得***的成本增加。Further, since the symbol sequence to be transmitted _{{I 1, I 2, ...} I n} is large bandwidth, more bandwidth needs to be able to support a device to transmit the modulated symbol sequence, the larger the bandwidth supported by the device, The higher the cost, the higher the cost of the system.

在现有的短距离光通信***中，由于***成本的限制，***中使用的设备的带宽相对信号的带宽而言都是严重不足的。因此，在发送端设备，可以采用频谱压缩技术将发送端设备发送的信号的带宽降低。In existing short-range optical communication systems, the bandwidth of devices used in the system is seriously insufficient relative to the bandwidth of the signal due to system cost constraints. Therefore, at the transmitting end device, the spectrum compression technology can be used to reduce the bandwidth of the signal transmitted by the transmitting device.

现有技术中，为了减少待传输的符号序列{I₁,I₂,...I_n}的带宽，发送端设备利用携带至少3个抽头的RRC滤波器对待传输的符号序列 {I₁,I₂,...I_n}进行预处理。In the prior art, in order to reduce the symbol to be transmitted sequence _{{I 1, I 2, ...} I n} bandwidth, the transmission side apparatus by using at least three taps carry RRC filter symbols to be transmitted sequence {I _1, I ₂ ,...I _n } is pretreated.

RRC滤波器对待传输的符号序列{I₁,I₂,...I_n}的处理过程是一个滤波的过程。RRC滤波器通过改变RRC滤波器的抽头系数，可以达到不同的滤波效果，即不同的RRC滤波器的抽头系数可以使得待传输的符号序列{I₁,I₂,...I_n}的带宽不同。RRC滤波器对待传输符号序列{I₁,I₂,...I_n}的滤波过程也是RRC滤波器对待传输符号序列{I₁,I₂,...I_n}的宽带压缩过程。The processing of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted by the RRC filter is a filtering process. The RRC filter can achieve different filtering effects by changing the tap coefficients of the RRC filter, that is, the tap coefficients of different RRC filters can make the bandwidth of the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted different. Broadband RRC filter to be transmitted symbol sequence _{{I 1, I 2, ...} I n} RRC filter filtering process is to be transmitted symbol sequence _{{I 1, I 2, ...} I n} compression process.

具体的，结合图1，如图3所示，PAM4序列发生器在生成待传输的符号序列{I₁,I₂,...I_n}后，将待传输的符号序列{I₁,I₂,...I_n}发送至RRC滤波器，RRC滤波器对待传输的符号序列{I₁,I₂,...I_n}进行滤波处理，生成符号序列

其中，RRC滤波器的输入信号与输出信号具有如下关系：Specifically, in conjunction with FIGS. 1, 3, PAM4 symbol sequence generator generates a sequence to be transmitted symbol sequence _{{I 1, I 2, ...} I n} later, to be transmitted {I _1, I ₂ , ... I _n } is sent to the RRC filter, and the RRC filter filters the symbol sequences {I ₁ , I ₂ , ... I _n } to be transmitted to generate a symbol sequence

The input signal of the RRC filter has the following relationship with the output signal:

RRC滤波器将其生成的符号序列

发送至DAC，DAC将

转换为模拟信号D(t)，并将D(t)发送至激光器。激光器在接收到模拟信号D(t)后，对模拟信号D(t)进行光调制，生成光信号，并将生成的光信号耦合到光纤信道中传输。The symbol sequence generated by the RRC filter

Send to DAC, DAC will

Convert to analog signal D(t) and send D(t) to the laser. After receiving the analog signal D(t), the laser optically modulates the analog signal D(t) to generate an optical signal, and couples the generated optical signal into a fiber channel for transmission.

待传输的符号序列{I₁,I₂,...I_n}通过RRC滤波器的带宽压缩处理，符号序列

的带宽比待传输的符号序列{I₁,I₂,...I_n}小，能够符合信号对***带宽的要求。但是，RRC的实现结构非常复杂，需要采用至少3个不同系数的抽头，伴随着实现结构的复杂，***的成本会更高。The symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted is processed by the bandwidth compression of the RRC filter, the symbol sequence

The bandwidth is smaller than the symbol sequence {I ₁ , I ₂ , ... I _n } to be transmitted, and can meet the signal-to-system bandwidth requirements. However, the implementation structure of RRC is very complicated, and it is necessary to adopt at least three taps with different coefficients. With the complexity of the implementation structure, the cost of the system will be higher.

为了能够解决上述问题，本发明实施例提供一种信号处理方法、装置及***，发送端设备通过对待传输的序列信号经过延时叠加处理，即可降低发送端设备发送信号的带宽，且接收端设备在接收到发送端设备发送的信号后，也只需对接收到的信号进行延时叠加处理即可获取到发送端真正传输的信号，这样即可降低发送端设备发送的信号对设备的带宽的要求。 In order to solve the above problem, the embodiment of the present invention provides a signal processing method, apparatus, and system. The transmitting end device can reduce the bandwidth of the signal sent by the transmitting end device by delaying the superposition processing of the sequence signal to be transmitted, and the receiving end After receiving the signal sent by the sending end device, the device only needs to delay the superimposing processing on the received signal to obtain the signal actually transmitted by the transmitting end, so as to reduce the bandwidth of the signal sent by the transmitting end device to the device. Requirements.

实施例一 Embodiment 1

本发明实施例提供一种预编码器100，如图4所示，预编码器100包括延时单元10和与所述延时单元10连接的处理单元11。The embodiment of the present invention provides a precoder 100. As shown in FIG. 4, the precoder 100 includes a delay unit 10 and a processing unit 11 connected to the delay unit 10.

具体的，所述延时单元10，用于接收第一符号序列，且将所述第一符号序列延时N个第一符号周期，以生成第二符号序列，并向所述处理单元发送所述第二符号序列，所述第一符号序列的电平数量为M，所述第一符号周期为所述第一符号序列中任意两个相邻符号之间的时间长度，N≥1，M≥2。Specifically, the delay unit 10 is configured to receive a first symbol sequence, and delay the first symbol sequence by N first symbol periods to generate a second symbol sequence, and send the sequence to the processing unit. a second symbol sequence, the number of levels of the first symbol sequence is M, and the first symbol period is a length of time between any two adjacent symbols in the first symbol sequence, N≥1, M ≥2.

所述处理单元11，用于接收所述第一符号序列和所述延时单元10发送的第二符号序列，且根据所述第一符号序列和所述第二符号序列，生成第三符号序列，并将所述第三符号序列发送，所述第三符号序列的带宽小于所述第一符号序列的带宽。The processing unit 11 is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit 10, and generate a third symbol sequence according to the first symbol sequence and the second symbol sequence And transmitting the third symbol sequence, the third symbol sequence having a bandwidth smaller than a bandwidth of the first symbol sequence.

进一步地，如图5所示，本发明实施例提供的预编码器100中的所述处理单元11包括加法子单元11a和发送子单元11b，所述加法子单元11a与所述发送子单元11b和所述延时单元10均连接。Further, as shown in FIG. 5, the processing unit 11 in the precoder 100 according to the embodiment of the present invention includes an adding subunit 11a and a transmitting subunit 11b, and the adding subunit 11a and the transmitting subunit 11b And the delay unit 10 is connected.

具体的，所述加法子单元11a，用于接收所述第一符号序列和所述延时单元10发送的第二符号序列，并将所述第一符号序列和所述第二符号序列相加，得到第三符号序列。Specifically, the adding sub-unit 11a is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit 10, and add the first symbol sequence and the second symbol sequence , to obtain a third symbol sequence.

所述发送子单元11b，用于将所述加法子单元11a得到的所述第三符号序列发送。The transmitting subunit 11b is configured to send the third symbol sequence obtained by the adding subunit 11a.

需要说明的是，本发明实施例中的处理单元11根据所述第一符号序列和所述第二符号序列，生成第三符号序列的子单元并不仅仅限定于加法子单元11b，还可以为其他任意一种能够实现该功能的子单元，例如乘法子单元。It should be noted that the processing unit 11 in the embodiment of the present invention generates a sub-unit of the third symbol sequence according to the first symbol sequence and the second symbol sequence, and is not limited to the addition sub-unit 11b, and may be Any other subunit capable of implementing this function, such as a multiplication subunit.

可以理解的是，本发明实施例提供的延时单元10可以包含接收子单元、延时处理子单元和发送子单元，也可以为集成延时单元10所完成功能的模块，本发明实施例不作具体限定。It can be understood that the delay unit 10 provided by the embodiment of the present invention may include a receiving subunit, a delay processing subunit, and a sending subunit, or may be a module that integrates the functions of the delay unit 10, which is not implemented in the embodiment of the present invention. Specifically limited.

本发明实施例中，预编码器接收到的第一符号序列的电平数量为M，且M≥2，即第一符号序列是多电平符号序列，该第一符号序 列的起伏变化比较剧烈，且第一符号序列的频谱分布比较分散，预编码器通过对第一符号序列的延时生成第二符号序列，并将第一符号序列和第二序号序列相加得到第三符号序列，采用该方式对第一符号序列处理后得到的第三符号序列的起伏变化较为缓慢，相应的，第三符号序列的频谱较为集中，使得第三符号序列的带宽小于第一符号序列的带宽，也就是说，本发明实施例提供的预编码器通过对第一符号序列的处理，能够有效降低第一符号序列的带宽。In the embodiment of the present invention, the number of levels of the first symbol sequence received by the precoder is M, and M≥2, that is, the first symbol sequence is a multi-level symbol sequence, and the first symbol sequence The fluctuation of the column is more severe, and the spectral distribution of the first symbol sequence is relatively scattered. The precoder generates a second symbol sequence by delaying the first symbol sequence, and adds the first symbol sequence and the second sequence number. a third symbol sequence, in which the fluctuation of the third symbol sequence obtained after processing the first symbol sequence is relatively slow, and correspondingly, the spectrum of the third symbol sequence is concentrated, so that the bandwidth of the third symbol sequence is smaller than the first symbol The bandwidth of the sequence, that is, the precoder provided by the embodiment of the present invention can effectively reduce the bandwidth of the first symbol sequence by processing the first symbol sequence.

实施例二 Embodiment 2

本发明实施例提供一种包含实施例一描述的预编码器的通信设备110，如图6所示，该通信设备110包括信号发生器20，与所述信号发生器20连接的符号调制器21，与符号调制器21连接的预编码器22，以及与预编码器22连接的数模转换器23。The embodiment of the present invention provides a communication device 110 including the precoder described in Embodiment 1. As shown in FIG. 6, the communication device 110 includes a signal generator 20, and a symbol modulator 21 connected to the signal generator 20. A precoder 22 connected to the symbol modulator 21 and a digital to analog converter 23 connected to the precoder 22.

具体的，所述信号发生器20，用于生成待传输的比特序列，并向所述符号调制器21发送所述待传输的比特序列。Specifically, the signal generator 20 is configured to generate a bit sequence to be transmitted, and send the bit sequence to be transmitted to the symbol modulator 21.

具体的，所述符号调制器21，用于接收所述信号发生器20发送的所述待传输的比特序列，且采用预设的脉冲幅度调制方式对所述待传输比特序列进行调制，以生成第一符号序列，并向所述预编码器22发送所述第一符号序列，所述第一符号序列的电平数量为M，M≥2。Specifically, the symbol modulator 21 is configured to receive the bit sequence to be transmitted sent by the signal generator 20, and modulate the bit sequence to be transmitted by using a preset pulse amplitude modulation manner to generate a first sequence of symbols and transmitting the first sequence of symbols to the precoder 22, the number of levels of the first sequence of symbols being M, M ≥ 2.

其中，预设的脉冲幅度调制方法可以为PAM4，也可以为PAM6，还可以为其他任意一种多电平的PAM，本发明实施例对此不作具体限定。The preset pulse amplitude modulation method may be PAM4 or PAM6, and may also be any other multi-level PAM, which is not specifically limited in the embodiment of the present invention.

具体的，所述预编码器22，用于接收所述符号调制器21发送的所述第一符号序列，且对所述第一符号序列进行编码，以生成第三符号序列，并向所述数模转换器23发送所述第三符号序列，所述第三符号序列的带宽小于所述第一符号序列的带宽。Specifically, the precoder 22 is configured to receive the first symbol sequence sent by the symbol modulator 21, and encode the first symbol sequence to generate a third symbol sequence, and The digital to analog converter 23 transmits the third sequence of symbols, the bandwidth of the third sequence of symbols being less than the bandwidth of the first sequence of symbols.

这里，预编码器22与实施例一中的预编码器100是相同的。Here, the precoder 22 is the same as the precoder 100 in the first embodiment.

所述数模转换器23，用于接收所述预编码器22发送的所述第三符号序列，且对所述第三符号序列进行数模转换，生成第一模拟 信号，并将所述第一模拟信号发送。The digital-to-analog converter 23 is configured to receive the third symbol sequence sent by the precoder 22, and perform digital-to-analog conversion on the third symbol sequence to generate a first simulation. Signaling and transmitting the first analog signal.

进一步地，结合图6，如图7所示，所述通信设备110还包括与所述数模转换器23连接的光调制器24。Further, in conjunction with FIG. 6, as shown in FIG. 7, the communication device 110 further includes a light modulator 24 coupled to the digital to analog converter 23.

所述光调制器24，用于接收所述数模转换器23发送的第一模拟信号，将所述第一模拟信号转换为光信号，并将所述光信号经由光纤信道发送。The optical modulator 24 is configured to receive a first analog signal sent by the digital-to-analog converter 23, convert the first analog signal into an optical signal, and transmit the optical signal via a fiber channel.

优选的，本发明实施例中的光调制器24为激光器。Preferably, the light modulator 24 in the embodiment of the invention is a laser.

本发明实施例中的通信设备在生成待传输的比特序列，并就待传输的比特序列调至为第一符号序列后，通信设备利用预编码器对第一符号序列进行编码，生成了带宽小于第一符号序列的第三符号序列，第三符号序列的带宽的减小使得通信设备发送的信号的带宽减小，实现了通信设备发送信号的带宽的减小，降低了通信设备的成本，且减小了色散对通信设备发送的信号的影响。After the communication device in the embodiment of the present invention generates the bit sequence to be transmitted and adjusts the bit sequence to be transmitted to the first symbol sequence, the communication device uses the precoder to encode the first symbol sequence, and generates a bandwidth smaller than The third symbol sequence of the first symbol sequence, the reduction of the bandwidth of the third symbol sequence reduces the bandwidth of the signal transmitted by the communication device, reduces the bandwidth of the signal transmitted by the communication device, and reduces the cost of the communication device, and The effect of dispersion on the signal transmitted by the communication device is reduced.

实施例三Embodiment 3

本发明实施例提供一种信号处理方法，应用于包含有上述通信设备和与该相对应的接收端设备的通信***。其中，上述通信设备为发送端设备，该通信设备的结构示意图可以参考图6和图7。The embodiment of the invention provides a signal processing method, which is applied to a communication system including the above communication device and the corresponding receiving device. The foregoing communication device is a transmitting device, and a schematic structural diagram of the communication device can refer to FIG. 6 and FIG. 7.

如图8所示，该信号处理方法包括：As shown in FIG. 8, the signal processing method includes:

S101、通信设备获取待传输的电平数量为M第一符号序列，M≥2。S101. The communication device acquires the level of the level to be transmitted as the M first symbol sequence, and M≥2.

具体的，本发明实施例中通信设备获取待传输的第一符号序列的方法为：通信设备在生成待传输比特序列之后，该通信设备采用预设的脉冲幅度调制方式对待传输比特序列进行调制，生成待传输的第一符号序列。Specifically, in the embodiment of the present invention, the method for the communication device to obtain the first symbol sequence to be transmitted is: after the communication device generates the bit sequence to be transmitted, the communication device uses a preset pulse amplitude modulation manner to modulate the transmission bit sequence. A first symbol sequence to be transmitted is generated.

其中，本发明实施例中预设的脉冲幅度调制方法可以为PAM4，也可以为PAM6，还可以为其他任意一种多电平的PAM，本发明实施例对此不作具体限定。The method for modulating the pulse amplitude in the embodiment of the present invention may be PAM4 or PAM6, and may also be any other multi-level PAM, which is not specifically limited in this embodiment of the present invention.

示例性的，通信设备生成的待传输比特序列为{b₁,b₂,...b_n,...b_2n}，n为正整数。通信设备采用PAM4技术对待传输比特序列{b₁,b₂,...b_n,...b_2n} 进行调制，生成待传输的第一符号序列{I₁,I₂,...I_n}。Exemplarily, the bit sequence to be transmitted generated by the communication device is {b ₁ , b ₂ , . . . b _n , . . . b _2n }, and n is a positive integer. The communication device uses the PAM4 technology to modulate the transmission bit sequence {b ₁ , b ₂ , ... b _n , ... b _2n } to generate a first symbol sequence {I ₁ , I ₂ , ... I to be transmitted _n }.

本发明实施例中通信设备获取待传输的第一符号序列的方法与现有技术中发送端设备获取待传输的符号序列的方法相同，此处不再详细赘述。The method for obtaining the first symbol sequence to be transmitted by the communication device in the embodiment of the present invention is the same as the method for the source device to obtain the symbol sequence to be transmitted in the prior art, and details are not described herein again.

S102、通信设备将待传输的第一符号序列延时N个第一符号周期，生成第二符号序列。S102. The communications device delays the first symbol sequence to be transmitted by N first symbol periods to generate a second symbol sequence.

其中，第一符号周期为第一符号序列中任意两个相邻符号之间的时间长度，N≥1。The first symbol period is a length of time between any two adjacent symbols in the first symbol sequence, and N≥1.

优选的，本发明实施例中的通信设备将待传输的第一符号序列延时一个第一符号周期，生成第二符号序列。Preferably, the communication device in the embodiment of the present invention delays the first symbol sequence to be transmitted by a first symbol period to generate a second symbol sequence.

S103、通信设备根据待传输的第一符号序列和第二符号序列，生成第三符号序列，第三符号序列的带宽小于待传输的第一符号序列的带宽。S103. The communications device generates a third symbol sequence according to the first symbol sequence and the second symbol sequence to be transmitted. The bandwidth of the third symbol sequence is smaller than the bandwidth of the first symbol sequence to be transmitted.

具体的，通信设备将待传输的第一符号序列和第二符号序列相加，得到第三符号序列。Specifically, the communication device adds the first symbol sequence and the second symbol sequence to be transmitted to obtain a third symbol sequence.

优选的，本发明实施例中的通信设备将待传输的第一符号序列延时一个第一符号周期，生成第二符号序列。Preferably, the communication device in the embodiment of the present invention delays the first symbol sequence to be transmitted by a first symbol period to generate a second symbol sequence.

示例性的，待传输的第一符号序列表示为：d[k]＝I_k；1≤k≤n，第一符号周期T，通信设备将d[k]＝I_k；1≤k≤n延时一个符号周期生成的第二符号序列表示为d[k-1]＝I_k-1；1≤k≤n，则通信设备生成的第三符号序列

可以表示为

Exemplarily, the first symbol sequence to be transmitted is represented as: d[k]=I _k ; 1≤k≤n, the first symbol period T, the communication device will d[k]=I _k ;1≤k≤n The second symbol sequence generated by delaying one symbol period is represented as d[k-1]=I _k-1 ; 1≤k≤n, then the third symbol sequence generated by the communication device

It can be expressed as

若假设I₀＝0，则第三符号序列为：If I ₀ = 0, the third symbol sequence is:

本发明实施例中通信设备获取到的第一符号序列的电平数量为M，且M≥2，即第一符号序列是多电平符号序列，该第一符号序列的起伏变化比较剧烈，且第一符号序列的频谱分布比较分散，通信设备通过对第一符号序列的延时生成第二符号序列，并将第一符号序列和第二序号序列相加得到第三符号序列，采用该方式对第一符号序列处理后得到的第三符号序列的起伏变化较为缓慢，相应的， 第三符号序列的频谱较为集中，使得第三符号序列的带宽小于第一符号序列的带宽，也就是说，本发明实施例提供的通信设备通过对第一符号序列的处理，能够有效降低第一符号序列的带宽。In the embodiment of the present invention, the number of levels of the first symbol sequence acquired by the communication device is M, and M≥2, that is, the first symbol sequence is a multi-level symbol sequence, and the fluctuation of the first symbol sequence is relatively severe, and The spectrum distribution of the first symbol sequence is relatively dispersed. The communication device generates a second symbol sequence by delaying the first symbol sequence, and adds the first symbol sequence and the second sequence sequence to obtain a third symbol sequence. The fluctuation of the third symbol sequence obtained after the processing of the first symbol sequence is relatively slow, correspondingly, The spectrum of the third symbol sequence is relatively concentrated, so that the bandwidth of the third symbol sequence is smaller than the bandwidth of the first symbol sequence. That is, the communication device provided by the embodiment of the present invention can effectively reduce the first by processing the first symbol sequence. The bandwidth of the symbol sequence.

示例性的，第三符号序列

的符号速率为25Gbps，图9示出了第三符号序列

的频谱图。图9中横轴代表频率f，纵轴代表振幅的对数。从图9可以看出，第三符号序列

的主瓣带宽为12.5GHz，第三符号序列

的主瓣带宽的数值为第三符号序列

的符号速率的数值的一半。Exemplary, third symbol sequence

The symbol rate is 25 Gbps, and Figure 9 shows the third symbol sequence.

Spectrogram. In Fig. 9, the horizontal axis represents the frequency f, and the vertical axis represents the logarithm of the amplitude. As can be seen from Figure 9, the third symbol sequence

The main lobe bandwidth is 12.5 GHz, the third symbol sequence

The value of the main lobe bandwidth is the third symbol sequence

Half of the value of the symbol rate.

将图2和图9做比较，可以看出，本发明实施例中通信设备发送的第三符号序列的主瓣带宽要小于现有技术中发送端设备发送的待传输的符号序列的主瓣带宽，同时通信设备发送的第三符号序列的旁瓣带宽也要小于现有技术中发送端设备发送的待传输的符号序列的旁瓣带宽。Comparing FIG. 2 and FIG. 9 , it can be seen that the main lobe bandwidth of the third symbol sequence sent by the communication device in the embodiment of the present invention is smaller than the main lobe bandwidth of the symbol sequence to be transmitted sent by the transmitting device in the prior art. At the same time, the sidelobe bandwidth of the third symbol sequence sent by the communication device is also smaller than the sidelobe bandwidth of the symbol sequence to be transmitted sent by the transmitting device in the prior art.

S104、通信设备对第三符号序列进行数模转换，生成第一模拟信号。S104. The communication device performs digital-to-analog conversion on the third symbol sequence to generate a first analog signal.

S105、通信设备将第一模拟信号转换为光信号，并将光信号经由光纤信道发送。S105. The communication device converts the first analog signal into an optical signal, and transmits the optical signal via a fiber channel.

本发明实施例中S104和S105与现有技术中发送端设备对待传输的符号序列的处理过程相同，此处不再详细赘述。In the embodiment of the present invention, S104 and S105 are the same as the processing procedure of the symbol sequence to be transmitted by the transmitting device in the prior art, and details are not described herein again.

本发明实施例中通信设备通过对待传输的第一符号序列进行延时叠加处理，生成了带宽较小的第三符号序列，这样，第三符号序列的传输可以使通信***采用支持较低带宽的设备，使得***的实现成本大大降低。In the embodiment of the present invention, the communication device performs delay overlay processing on the first symbol sequence to be transmitted, and generates a third symbol sequence with a smaller bandwidth, so that the transmission of the third symbol sequence can enable the communication system to support lower bandwidth. The equipment makes the implementation cost of the system greatly reduced.

S106、接收端设备通过光纤信道接收通信设备发送的光信号。S106. The receiving end device receives the optical signal sent by the communications device by using a fiber channel.

S107、接收端设备对光信号进行光电转换，生成第二模拟信号。S107. The receiving end device photoelectrically converts the optical signal to generate a second analog signal.

S108、接收端设备对第二模拟信号进行模数转换，生成第四符号序列。S108. The receiving end device performs analog-to-digital conversion on the second analog signal to generate a fourth symbol sequence.

接收端设备对第二模拟信号进行模数转换的过程可视为接收端设备对采用预设抽样频率对第二模拟信号进行采样。 The process of analog-to-digital conversion of the second analog signal by the receiving end device may be regarded as the receiving end device sampling the second analog signal by using a preset sampling frequency.

本发明实施例中的S106-S108与现有技术中接收端设备对接收到的光信号进行光电转换和模数转换的过程相同，此处不再详细赘述。The S106-S108 in the embodiment of the present invention is the same as the process of performing photoelectric conversion and analog-to-digital conversion on the received optical signal in the prior art, and details are not described herein again.

S109、接收端设备将第四符号序列延时K个第二符号周期生成第六符号序列。S109. The receiving end device delays the fourth symbol sequence by K second symbol periods to generate a sixth symbol sequence.

其中，K≥1，第二符号周期为第四符号序列的符号周期，第四符号序列的符号周期与上述预设的抽样频率相关。Wherein, K≥1, the second symbol period is a symbol period of the fourth symbol sequence, and the symbol period of the fourth symbol sequence is related to the preset sampling frequency.

优选的，本发明实施例中预设的抽样频率与第四符号序列的频率相同。Preferably, the sampling frequency preset in the embodiment of the present invention is the same as the frequency of the fourth symbol sequence.

S110、接收端设备将第四符号序列和第六符号序列相加，得到第七符号序列。S110. The receiving end device adds the fourth symbol sequence and the sixth symbol sequence to obtain a seventh symbol sequence.

S111、接收端设备对第七符号序列进行均衡处理，得到第七符号序列。S111. The receiving end device performs equalization processing on the seventh symbol sequence to obtain a seventh symbol sequence.

与通信设备对待传输的第一符号序列的处理相对应，接收端设备对第四符号序列进行延时叠加处理，即可恢复出通信设备发送的待传输的第一符号序列。Corresponding to the processing of the first symbol sequence to be transmitted by the communication device, the receiving device delays the fourth symbol sequence to recover the first symbol sequence to be transmitted sent by the communication device.

为了更加详细的说明本发明提供的信号处理方法，图10示出了本发明实施例中通信设备发送光信号和接收端设备接收光信号的流程。In order to explain the signal processing method provided by the present invention in more detail, FIG. 10 shows a flow of the optical signal transmitted by the communication device and the optical signal received by the receiving device in the embodiment of the present invention.

其中，{b₁,b₂,...b_n,...b_2n}为待传输的比特序列，{I₁,I₂,...I_n}为待传输的第一符号序列，

为第三符号序列，D(t)为第一模拟信号，R(t)为第二模拟信号，{v′₁,v'₂,...v'_n}为第四符号序列，{v₁,v₂,...v_n}为第六符号序列，{I′₁,I′₂,...I′_n}为第七符号序列，Z_- ¹表示将符号序列延时一个符号周期。Where {b ₁ , b ₂ , . . . b _n , . . . b _2n } is the bit sequence to be transmitted, and {I ₁ , I ₂ , . . . , I _n } is the first symbol sequence to be transmitted.

For the third symbol sequence, D(t) is the first analog signal, R(t) is the second analog signal, {v' ₁ , v' ₂ , ... v' _n } is the fourth symbol sequence, {v ₁ , v ₂ , ... v _n } is a sixth symbol sequence, {I' ₁ , I' ₂ , ... I' _n } is a seventh symbol sequence, and Z _- ¹ represents a symbol sequence delayed by one symbol cycle.

图10所示的信号处理流程可以参考上述对S101-S111的相关描述，此处不再详细赘述。For the signal processing procedure shown in FIG. 10, reference may be made to the foregoing description of S101-S111, and details are not described herein again.

本发明实施例中的通信设备在获取到待传输的第一符号序列后，通信设备利用预编码器对第一符号序列进行编码，生成了带宽小于第一符号序列的第三符号序列，第三符号序列的带宽的减小使 得通信设备发送的信号的带宽减小，实现了通信设备发送信号的带宽的减小，降低了通信设备的成本，而且减小了色散对通信设备发送的信号的影响。After acquiring the first symbol sequence to be transmitted, the communications device in the embodiment of the present invention uses the precoder to encode the first symbol sequence, and generates a third symbol sequence having a bandwidth smaller than the first symbol sequence, and third. The reduction in the bandwidth of the symbol sequence The bandwidth of the signal transmitted by the communication device is reduced, the bandwidth of the signal transmitted by the communication device is reduced, the cost of the communication device is reduced, and the influence of the dispersion on the signal transmitted by the communication device is reduced.

光信号在光纤中传输一段距离后，光信号会发生幅度降低、宽度展宽的变化，这种现象称为色散。After the optical signal is transmitted for a certain distance in the optical fiber, the optical signal will undergo a decrease in amplitude and a widening of the width. This phenomenon is called dispersion.

在光纤中，光信号中的不同波长的信号成分对应不同的传输速度，因此，光信号中的信号成分到达光纤的输出端所使用的时间就会不同，会引起的光信号的展宽，即光脉冲信号沿着光纤传输一段距离后会造成频宽变大。In an optical fiber, signal components of different wavelengths in an optical signal correspond to different transmission speeds. Therefore, the time required for the signal components in the optical signal to reach the output end of the optical fiber is different, and the optical signal is broadened, that is, light. When the pulse signal is transmitted along the optical fiber for a certain distance, the bandwidth becomes large.

通常情况下，光信号在光纤中传输一段距离后，受色散影响，使得接收端设备接收到的光信号的带宽过大，从而导致接收端设备接收信号的灵敏度下降。Generally, after the optical signal is transmitted for a long distance in the optical fiber, it is affected by the dispersion, so that the bandwidth of the optical signal received by the receiving device is too large, thereby causing the sensitivity of the receiving device to receive the signal to decrease.

本发明实施例中，由于发送端设备发送的光信号的带宽较小，因此光信号受色散的影响较小，使得接收端设备接收到的光信号的带宽较小，从而提高了接收端设备接收信号的灵敏度。In the embodiment of the present invention, since the bandwidth of the optical signal sent by the transmitting device is small, the optical signal is less affected by the dispersion, so that the bandwidth of the optical signal received by the receiving device is smaller, thereby improving the receiving of the receiving device. The sensitivity of the signal.

所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将移动设备的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。上述描述的***，移动设备和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。It will be clearly understood by those skilled in the art that for the convenience and brevity of the description, only the division of each functional module described above is exemplified. In practical applications, the above function assignment can be completed by different functional modules as needed. The internal structure of the mobile device is divided into different functional modules to perform all or part of the functions described above. For the specific working process of the foregoing system, the mobile device and the unit, refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

在本申请所提供的几个实施例中，应该理解到，所揭露的***，移动设备和方法，可以通过其它的方式实现。例如，以上所描述的移动设备实施例仅仅是示意性的，例如，所述模块或单元的划分，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***，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，移动设备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。 In the several embodiments provided by the present application, it should be understood that the disclosed system, mobile device and method may be implemented in other manners. For example, the mobile device embodiments described above are merely illustrative. For example, the division of the modules or units is only one logical function division. In actual implementation, there may be another division manner, such as multiple units or components. It can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, mobile device or unit, and may be in electrical, mechanical or other form.

所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

另外，在本发明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，也可以采用软件功能单元的形式实现。In addition, each functional unit in each embodiment of the present invention 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 a software functional unit.

所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本发明的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本发明各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention, which is essential or contributes to the prior art, or all or part of the technical solution, may be embodied in the form of a software product stored in a storage medium. A number of instructions are included to cause a computer device (which may be a personal computer, server, or network device, etc.) or a processor to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, and the like. .

以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。 The above is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention. It should be covered by the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the appended claims.

Claims (10)

1. 一种预编码器，其特征在于，包括延时单元和与所述延时单元连接的处理单元；其中，A precoder, comprising: a delay unit and a processing unit connected to the delay unit; wherein

   所述延时单元，用于接收第一符号序列，且将所述第一符号序列延时N个第一符号周期，以生成第二符号序列，并向所述处理单元发送所述第二符号序列，所述第一符号序列的电平数量为M，所述第一符号周期为所述第一符号序列中任意两个相邻符号之间的时间长度，N≥1，M≥2；The delay unit is configured to receive a first symbol sequence, and delay the first symbol sequence by N first symbol periods to generate a second symbol sequence, and send the second symbol to the processing unit a sequence, the number of levels of the first symbol sequence is M, the first symbol period is a length of time between any two adjacent symbols in the first symbol sequence, N≥1, M≥2;

   所述处理单元，用于接收所述第一符号序列和所述延时单元发送的第二符号序列，且根据所述第一符号序列和所述第二符号序列，生成第三符号序列，并将所述第三符号序列发送，所述第三符号序列的带宽小于所述第一符号序列的带宽。The processing unit is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit, and generate a third symbol sequence according to the first symbol sequence and the second symbol sequence, and Transmitting the third symbol sequence, the third symbol sequence having a bandwidth smaller than a bandwidth of the first symbol sequence.
2. 根据权利要求1所述的预编码器，其特征在于，所述处理单元包括加法子单元和发送子单元，所述加法子单元与所述延时单元连接，所述加法子单元和所述发送子单元连接；其中，The precoder according to claim 1, wherein said processing unit comprises an addition subunit and a transmission subunit, said addition subunit being connected to said delay unit, said addition subunit and said transmitting Subunit connection; where

   所述加法子单元，用于接收所述第一符号序列和所述延时单元发送的第二符号序列，并将所述第一符号序列和所述第二符号序列相加，得到第三符号序列；The adding subunit is configured to receive the first symbol sequence and the second symbol sequence sent by the delay unit, and add the first symbol sequence and the second symbol sequence to obtain a third symbol sequence;

   所述发送子单元，用于将所述加法子单元得到的所述第三符号序列发送。The sending subunit is configured to send the third symbol sequence obtained by the adding subunit.
3. 一种通信设备，包括信号发生器，与所述信号发生器连接的符号调制器，以及数模转换器，其特征在于，所述通信设备还包括如权利要求1所述的预编码器，所述预编码器与所述符号调制器和所述数模转换器均连接；其中，A communication device comprising a signal generator, a symbol modulator coupled to the signal generator, and a digital to analog converter, wherein the communication device further comprises the precoder of claim 1 a precoder coupled to the symbol modulator and the digital to analog converter; wherein

   所述信号发生器，用于生成待传输的比特序列，并向所述符号调制器发送所述待传输的比特序列；The signal generator is configured to generate a bit sequence to be transmitted, and send the bit sequence to be transmitted to the symbol modulator;

   所述符号调制器，用于接收所述信号发生器发送的所述待传输的比特序列，且采用预设的脉冲幅度调制方式对所述待传输比特序列进行调制，以生成第一符号序列，并向所述预编码器发送所述第一符号 序列，所述第一符号序列的电平数量为M，M≥2；The symbol modulator is configured to receive the bit sequence to be transmitted sent by the signal generator, and modulate the bit sequence to be transmitted by using a preset pulse amplitude modulation manner to generate a first symbol sequence. And transmitting the first symbol to the precoder a sequence, the number of levels of the first symbol sequence is M, M ≥ 2;

   所述预编码器，用于接收所述符号调制器发送的所述第一符号序列，且对所述第一符号序列进行编码，以生成第三符号序列，并向所述数模转换器发送所述第三符号序列，所述第三符号序列的带宽小于所述第一符号序列的带宽；The precoder is configured to receive the first symbol sequence sent by the symbol modulator, and encode the first symbol sequence to generate a third symbol sequence, and send the digital symbol sequence to the digital to analog converter The third symbol sequence, the third symbol sequence has a bandwidth smaller than a bandwidth of the first symbol sequence;

   所述数模转换器，用于接收所述预编码器发送的所述第三符号序列，且对所述第三符号序列进行数模转换，生成第一模拟信号，并将所述第一模拟信号发送。The digital-to-analog converter is configured to receive the third symbol sequence sent by the precoder, perform digital-to-analog conversion on the third symbol sequence, generate a first analog signal, and generate the first analog Signal transmission.
4. 根据权利要求3所述的通信设备，其特征在于，所述通信设备还包括与所述数模转换器连接的光调制器；The communication device according to claim 3, wherein said communication device further comprises a light modulator coupled to said digital to analog converter;

   所述光调制器，用于接收所述数模转换器发送的第一模拟信号，将所述第一模拟信号转换为光信号，并将所述光信号经由光纤信道发送。The optical modulator is configured to receive a first analog signal sent by the digital-to-analog converter, convert the first analog signal into an optical signal, and send the optical signal via a fiber channel.
5. 一种信号处理方法，其特征在于，应用于如权利要求3或4所述的通信设备，所述信号处理方法包括：A signal processing method, characterized by being applied to the communication device according to claim 3 or 4, wherein the signal processing method comprises:

   所述通信设备获取待传输的第一符号序列，所述第一符号序列的电平数量为M，M≥2；The communication device acquires a first symbol sequence to be transmitted, where the level of the first symbol sequence is M, M ≥ 2;

   所述通信设备将所述待传输的第一符号序列延时N个第一符号周期，生成第二符号序列，所述第一符号周期为所述第一符号序列中任意两个相邻符号之间的时间长度，N≥1；The communication device delays the first symbol sequence to be transmitted by N first symbol periods to generate a second symbol sequence, where the first symbol period is any two adjacent symbols in the first symbol sequence. Length of time between, N≥1;

   所述通信设备根据所述待传输的第一符号序列和所述第二符号序列，生成第三符号序列，所述第三符号序列的带宽小于所述待传输的第一符号序列的带宽；Generating, by the communication device, a third symbol sequence according to the first symbol sequence to be transmitted and the second symbol sequence, where a bandwidth of the third symbol sequence is smaller than a bandwidth of the first symbol sequence to be transmitted;

   所述通信设备对所述第三符号序列进行数模转换，生成第一模拟信号，并将所述第一模拟信号发送。The communication device performs digital-to-analog conversion on the third symbol sequence, generates a first analog signal, and transmits the first analog signal.
6. 根据权利要求5所述的信号处理方法，其特征在于，所述通信设备根据所述待传输的第一符号序列和所述第二符号序列，确定第三符号序列，具体包括：The signal processing method according to claim 5, wherein the communication device determines the third symbol sequence according to the first symbol sequence to be transmitted and the second symbol sequence, and specifically includes:

   所述通信设备将所述待传输的第一符号序列和所述第二符号序 列相加，得到所述第三符号序列。The communication device sets the first symbol sequence to be transmitted and the second symbol sequence The columns are added to obtain the third symbol sequence.
7. 根据权利要求5或6所述的信号处理方法，其特征在于，所述通信设备获取待传输的第一符号序列，具体包括：The signal processing method according to claim 5 or 6, wherein the communication device acquires the first symbol sequence to be transmitted, and specifically includes:

   所述通信设备生成待传输比特序列；The communication device generates a bit sequence to be transmitted;

   所述通信设备采用预设的脉冲幅度调制方式对所述待传输比特序列进行调制，得到所述待传输的第一符号序列。The communication device modulates the bit sequence to be transmitted by using a preset pulse amplitude modulation manner to obtain the first symbol sequence to be transmitted.
8. 根据权利要求7所述的信号处理方法，其特征在于，所述通信将所述第一模拟信号发送，包括：The signal processing method according to claim 7, wherein the transmitting the first analog signal comprises:

   所述通信设备将所述第一模拟信号转换为光信号，并将所述光信号经由光纤信道发送。The communication device converts the first analog signal into an optical signal and transmits the optical signal via a fiber channel.
9. 一种信号处理***，其特征在于，包括如权利要求3-4中任意一项所述的通信设备以及与所述通信设备相对应的接收端设备，所述通信设备为发送端设备，所述通信设备和所述接收端设备之间通过光纤连接；其中，A signal processing system, comprising: the communication device according to any one of claims 3-4; and the receiving device corresponding to the communication device, the communication device being a transmitting device, The communication device and the receiving end device are connected by an optical fiber; wherein

   所述接收端设备，用于接收所述通信设备发送的光信号，对所述光信号进行光电转换，生成第二模拟信号，且对所述第二模拟信号进行模数转换，生成第四符号序列，并对所述第四符号序列进行解码处理和均衡处理，生成第五符号序列。The receiving end device is configured to receive an optical signal sent by the communications device, perform photoelectric conversion on the optical signal, generate a second analog signal, and perform analog-to-digital conversion on the second analog signal to generate a fourth symbol. And performing a decoding process and an equalization process on the fourth symbol sequence to generate a fifth symbol sequence.
10. 根据权利要求9所述的信号处理***，其特征在于，A signal processing system according to claim 9, wherein:

    所述接收端设备，具体用于将所述第四符号序列延时K个第二符号周期生成第六符号序列，且将所述第四符号序列和所述第六符号序列相加，得到所述第七符号序列，并对所述第七符号序列进行均衡处理，得到所述第五符号序列，K≥1。 The receiving end device is specifically configured to delay the fourth symbol sequence by K second symbol periods to generate a sixth symbol sequence, and add the fourth symbol sequence and the sixth symbol sequence to obtain a The seventh symbol sequence is described, and the seventh symbol sequence is equalized to obtain the fifth symbol sequence, K≥1.

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