Signal sending method, device and equipment

Abstract

The invention provides a signal sending method, device and equipment. The method comprises the following steps: acquiring a bit sequence to be sent; based on a preset mapping rule, mapping the bit sequence into a fifth-order pulse amplitude modulation PAM5 symbol; the preset mapping rule is used for mapping every three continuous bits into one PAM5 symbol, and a plurality of PAM5 symbols are formed by mapping two different 3 bits; and converting the PAM5 symbol into an optical signal and sending the optical signal. According to the method provided by the embodiment of the invention, by adopting a many-to-one mapping mode of mapping one PAM5 symbol by 3 bits, the bit bearing capacity of a single symbol is greatly improved, a high transmission rate under a low symbol rate is realized, the bandwidth requirement of a device is effectively reduced, and compared with a traditional dual-polarization NRZ system and a same-rate PAM4 system, the requirement on the bandwidth of the device is remarkably reduced, and the system performance is improved. The bandwidth bottleneck that the more than 100G PON continues to use NRZ modulation is broken through, and meanwhile, the low-cost requirement of the ONU side is considered.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a signal transmission method, apparatus, and device. Background Technology

[0002] Passive Optical Networks (PONs) are point-to-multipoint (P2MP) optical transmission systems. As the next-generation optical access network technology evolving towards 50G PON, if GPONs exceeding 100G continue to use Non-Return to Zero (NRZ) modulation, the bandwidth required by the system will increase dramatically, significantly exceeding the development level of industry devices. Summary of the Invention

[0003] This invention provides a signal transmission method, apparatus, and device. By employing a many-to-one mapping method that maps 3 bits to 1 PAM5 symbol, the bit carrying capacity of a single symbol is significantly increased, achieving high transmission rates at low symbol rates and effectively reducing device bandwidth requirements. Compared to traditional dual-polarization NRZ systems and PAM4 systems at the same rate, it significantly reduces the bandwidth requirements of devices, breaking through the bandwidth bottleneck of using NRZ modulation in over 100G PONs, while also taking into account the low-cost requirements of the ONU side.

[0004] This invention provides a signal transmission method, comprising the following steps: Obtain the bit sequence to be sent; Based on a preset mapping rule, the bit sequence is mapped to a fifth-order pulse amplitude modulation (PAM5) symbol; the preset mapping rule is used to map every 3 consecutive bits to a PAM5 symbol, and there are multiple PAM5 symbols that are formed by mapping two different 3 bits. The PAM5 symbol is converted into an optical signal and transmitted.

[0005] According to a signal transmission method provided by the present invention, mapping the bit sequence into fifth-order pulse amplitude modulation (PAM5) symbols based on a preset mapping rule includes: Three consecutive bits of 000 are mapped to the first PAM5 symbol; Three consecutive bits 010 and three consecutive bits 011 are mapped together to form the second PAM5 symbol; Three consecutive bits 100 and three consecutive bits 101 are mapped together to the third PAM5 symbol; Three consecutive bits 110 and three consecutive bits 111 are mapped together to the fourth PAM5 symbol; Three consecutive bits 001 are mapped to the fifth PAM5 symbol.

[0006] According to a signal transmission method provided by the present invention, the probability distribution of the first PAM5 symbol to the fifth PAM5 symbol is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8].

[0007] According to a signal transmission method provided by the present invention, the signal entropy value of the PAM5 symbol is 2.25-bit / symbol.

[0008] According to the present invention, a signal transmission method is applied to the downlink transmission direction of a passive optical network (PON) exceeding 100G.

[0009] According to a signal transmission method provided by the present invention, the step of acquiring the bit sequence to be transmitted includes: Obtain a pseudo-random sequence; The pseudo-random sequence is channel-coded and interleaved to obtain the bit sequence.

[0010] The present invention also provides a signal transmitting device, comprising the following modules: The acquisition module is used to acquire the bit sequence to be sent; The mapping module is used to map the bit sequence into fifth-order pulse amplitude modulation (PAM5) symbols based on a preset mapping rule; the preset mapping rule is used to map every 3 consecutive bits into one PAM5 symbol, and there are multiple PAM5 symbols formed by two different 3-bit mappings. The transmitting module is used to convert the PAM5 symbol into an optical signal and transmit it.

[0011] The present invention also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the signal transmission method as described above.

[0012] The present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the signal transmission method as described above.

[0013] The present invention also provides a computer program product, including a computer program that, when executed by a processor, implements the signal transmission method as described above.

[0014] The signal transmission method, apparatus, and device provided by this invention significantly increase the bit capacity of a single symbol by adopting a many-to-one mapping method of 3 bits mapping 1 PAM5 symbol, achieving high transmission rate at low symbol rate and effectively reducing device bandwidth requirements. Compared with traditional dual-polarization NRZ systems and PAM4 systems at the same rate, it significantly reduces the requirements for device bandwidth, breaks through the bandwidth bottleneck of using NRZ modulation in over 100G PON, and also takes into account the low cost requirements of the ONU side. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the PON system structure provided by the present invention.

[0017] Figure 2 This is a flowchart illustrating the signal transmission method provided by the present invention.

[0018] Figure 3 This is a schematic diagram of the PAM5 symbol mapping provided by the present invention.

[0019] Figure 4 This is a schematic diagram of the signal transmitting device provided by the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the electronic device provided by the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0022] The following is combined Figures 1-5 The present invention describes a signal transmission method, apparatus, and device.

[0023] To facilitate a clearer understanding of the technical solutions of the various embodiments of this application, some technical content related to the various embodiments of this application will be introduced first.

[0024] Passive Optical Networks (PONs) are point-to-multipoint (P2MP) optical transmission systems. A PON network typically consists of three parts: an Optical Line Terminal (OLT), an Optical Distribution Network (ODN), and an Optical Network Unit (ONU). A schematic diagram is shown below. Figure 1 As shown, the ODN (Optical Network Node) consists of passive optical devices such as single-mode fiber, optical splitters, and optical connectors, providing the optical transmission medium for the physical connection between the OLT (Optical Line Terminal) and ONU (Optical Network Unit). Generally, the transmission direction from the OLT to the ONU is defined as the downlink transmission direction, and the transmission direction from the ONU to the OLT is defined as the uplink transmission direction. Currently, single-carrier 50Gb / s PON networks have been standardized. For the evolution of next-generation optical access networks towards 50G PON, multiple international standards organizations, including the ITU-T, are currently promoting the standardization work related to single-carrier speeds exceeding 100Gb / s.

[0025] For a PON system, it is a point-to-multipoint architecture. Therefore, given the low-cost requirements of PON, the ONU is extremely cost-sensitive. Thus, to ensure the overall system performance meets the industry-recognized 32dB requirement while simultaneously keeping the ONU as low-cost as possible, the ONU should use high-performance modulation schemes for signal generation.

[0026] As the next-generation optical access network technology for the evolution of 50G PON, if 100G+ PON continues to use Non-Return to Zero (NRZ) modulation, the bandwidth required by the system will increase dramatically, significantly exceeding the development level of industry devices. Therefore, existing technical solutions are difficult to directly continue to be used in 100G+ PON systems, and improvements to the signal transmission method are needed.

[0027] Figure 2 This is one of the flowcharts illustrating the signal transmission method provided by the present invention, which includes the following: Step 201: Obtain the bit sequence to be sent.

[0028] Specifically, in this embodiment, the PON system first obtains a pseudo-random sequence (PRBS), then performs channel coding and interleaving on the PRBS to finally obtain the bit sequence to be transmitted. Channel coding improves the signal's anti-interference capability, and interleaving effectively enhances the reliability of subsequent transmission.

[0029] Step 202: Based on the preset mapping rules, map the bit sequence into a fifth-order pulse amplitude modulation (PAM5) symbol; the preset mapping rules are used to map every 3 consecutive bits into a PAM5 symbol, and there are multiple PAM5 symbols that are mapped from two different 3 bits.

[0030] Specifically, after acquiring the bit sequence to be transmitted, this application maps every 3 consecutive bits to a PAM5 symbol based on a preset mapping rule, and multiple PAM5 symbols are mapped from two different combinations of 3 bits. In other words, this application uses a many-to-one mapping method of 3 bits to 1 PAM5 symbol, significantly increasing the bit capacity of a single symbol. Compared to traditional NRZ modulation, higher-order PAM5 modulation can achieve high transmission rates at lower symbol rates, effectively reducing device bandwidth requirements.

[0031] Step 203: Convert the PAM5 symbol into an optical signal and transmit it.

[0032] Specifically, after mapping the bit sequence into fifth-order pulse amplitude modulation (PAM5) symbols based on a preset mapping rule, this application can convert the PAM5 symbols into optical signals that can be transmitted in optical fibers, and then send the optical signals into the downlink transmission channel of a 100G+ PON to complete the signal transmission. Optionally, when the symbol rate is 45 GBaud, the dual polarization technology doubles the number of bits carried by the symbol through orthogonal polarization multiplexing, increasing the equivalent entropy value of the PAM5 symbol to 4.5-bit / symbol. At this time, the transmission rate corresponding to the 45 GBaud symbol rate is 45 GBaud × 4.5-bit / symbol. The dual polarization system can achieve a transmission rate of 200 Gb / s. Moreover, according to the design principles of communication systems, the bandwidth requirement of optoelectronic devices is about 0.5 to 0.6 times the symbol rate, corresponding to a device bandwidth requirement of 45 GBaud × 0.5, that is, only 23 GHz of device bandwidth is required. Compared with the traditional dual polarization NRZ system and the same rate PAM4 system, the requirement for device bandwidth is significantly reduced, breaking through the bandwidth bottleneck of using NRZ modulation in over 100G PON, while also taking into account the low cost requirements on the ONU side.

[0033] The method described in the above embodiments significantly increases the bit capacity of a single symbol by using a many-to-one mapping method that maps 3 bits to 1 PAM5 symbol, achieving a high transmission rate at a low symbol rate and effectively reducing the device bandwidth requirements. Compared with traditional dual-polarization NRZ systems and PAM4 systems at the same rate, it significantly reduces the requirements for device bandwidth, breaks through the bandwidth bottleneck of using NRZ modulation in over 100G PON, and also takes into account the low-cost requirements of the ONU side.

[0034] In some embodiments, based on a preset mapping rule, the bit sequence is mapped to a fifth-order pulse amplitude modulation (PAM5) symbol, including: Three consecutive bits of 000 are mapped to the first PAM5 symbol; Three consecutive bits 010 and three consecutive bits 011 are mapped together to form the second PAM5 symbol; Three consecutive bits 100 and three consecutive bits 101 are mapped together to the third PAM5 symbol; Three consecutive bits 110 and three consecutive bits 111 are mapped together to the fourth PAM5 symbol; Three consecutive bits 001 are mapped to the fifth PAM5 symbol.

[0035] Specifically, in this embodiment of the application, based on a preset mapping rule, every 3 consecutive bits are mapped to a PAM5 symbol, and there are multiple PAM5 symbols that are mapped by two different combinations of 3 bits, thereby greatly increasing the bit carrying capacity of a single symbol.

[0036] Optionally, such as Figure 3 As shown, for three consecutive 000 bits in the bit sequence to be transmitted, they are uniquely mapped to the first PAM5 symbol "-4" according to a preset rule, and the three-bit sequence corresponds to only this single PAM5 symbol.

[0037] Optionally, for three consecutive bits 010 or 011 in the bit sequence to be transmitted, the two different 3-bit sequences are mapped together to the second PAM5 symbol "-2", forming a many-to-one mapping relationship.

[0038] Optionally, for three consecutive bits 100 or 101 in the bit sequence to be transmitted, these two 3-bit sequences are uniformly mapped to the third PAM5 symbol 0, following the many-to-one mapping rule.

[0039] Optionally, for three consecutive bits 110 or 111 in the bit sequence to be transmitted, the two different 3-bit sequences are jointly mapped to the fourth PAM5 symbol "2".

[0040] Optionally, for three consecutive bits 001 in the bit sequence to be transmitted, they are uniquely mapped to the fifth PAM5 symbol "4".

[0041] The method described in the above embodiments significantly increases the bit capacity of a single symbol by combining one-to-one and many-to-one PAM5 symbol mapping, achieving high transmission rates at low symbol rates, reducing device bandwidth requirements, and effectively overcoming the technical bottleneck of using NRZ modulation in over 100G PON, while balancing rate, bandwidth, and cost.

[0042] In some embodiments, the probability distribution of the first PAM5 symbol to the fifth PAM5 symbol is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8].

[0043] Specifically, in this embodiment of the application, the first PAM5 symbol is mapped by the 3-bit sequence 000. There are a total of 8 types of 3-bit sequences, namely 000, 001, 010, 011, 100, 101, 110, and 111. The probability of each 3-bit sequence appearing is 1 / 8. Therefore, the probability of the first PAM5 symbol is 1 / 8.

[0044] The second PAM5 symbol is mapped by two 3-bit sequences, 010 and 011. The total probability of the two sequences is 1 / 8 + 1 / 8 = 2 / 8, so the probability of the second PAM5 symbol is 2 / 8.

[0045] The third PAM5 symbol corresponds to two 3-bit sequences, 100 and 101, with a total probability of 2 / 8. Therefore, the probability of the third PAM5 symbol is 2 / 8.

[0046] The fourth PAM5 symbol is generated by mapping two 3-bit sequences, 110 and 111, with a total probability of 2 / 8. Therefore, the probability of the fourth PAM5 symbol is 2 / 8.

[0047] The fifth PAM5 symbol corresponds to only the 3-bit sequence 001. The probability of a single sequence is 1 / 8, therefore the probability of the fifth PAM5 symbol is 1 / 8.

[0048] In other words, this application uses a hybrid mapping design where one 3-bit sequence corresponds to one PAM5 symbol and two 3-bit sequences correspond to one PAM5 symbol, resulting in a probability distribution of [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8] for the five PAM5 symbols. The first and fifth symbols, corresponding to only one type of 3-bit sequence, each have a probability of 1 / 8; the second, third, and fourth symbols, corresponding to two types of 3-bit sequences, each have a probability of 2 / 8. This achieves a non-uniform distribution of symbol probabilities, accurately shaping the probability and improving signal anti-interference capabilities.

[0049] The method in the above embodiment, through a hybrid mapping design of one 3-bit sequence corresponding to one PAM5 symbol and two 3-bit sequences corresponding to one PAM5 symbol, enables the first to fifth PAM5 symbols to form a non-uniform probability distribution of [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8], accurately achieving probability shaping, significantly improving the anti-interference capability of over 100G PON systems, and effectively adapting to transmission scenarios with many passive ODN devices and complex links.

[0050] In some embodiments, the signal entropy value of a PAM5 symbol is 2.25-bit / symbol.

[0051] Specifically, in this embodiment, the signal entropy value is used to measure the average amount of information carried by a single symbol. Optionally, the probability distribution of the first to fifth PAM5 symbols is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8]. According to the formula for calculating the signal entropy value, the total entropy value is 2.25 bit / symbol, which means that a single PAM5 symbol can carry an average of 2.25 bits of information, and this entropy value is uniquely determined by the probability distribution.

[0052] Optionally, in a single-polarization scenario, if the symbol rate is 45 GBaud, the system transmission rate = symbol rate × entropy = 45 GBaud × 2.25-bit / symbol = 101.25 Gb / s, which can meet the basic rate requirements of over 100G PON.

[0053] In dual-polarization scenarios, dual-polarization technology can double the number of bits carried by a single symbol, that is, the entropy value is effectively increased to 4.5 bit / symbol. At this time, a 45GBaud symbol rate can achieve a transmission rate of 45×4.5 = 200Gb / s, which fully covers the high-speed requirements of over 100G PON.

[0054] Alternatively, according to the principle of communication, the bandwidth required by the device is positively correlated with the symbol rate. A traditional dual-polarization NRZ system requires a symbol rate of 100 GBaud to achieve a rate of 200 Gb / s, which corresponds to a device bandwidth requirement of about 50~60 GHz, far exceeding the conventional performance level of current optoelectronic devices in the industry.

[0055] In the dual-polarization scenario, this application can achieve a data rate of 200Gb / s with a symbol rate of 45GBaud, corresponding to a device bandwidth requirement of only 23GHz. This is more than 50% lower than the bandwidth requirement of NRZ system and lower than the 25GHz bandwidth requirement of PAM4 system at the same rate. It perfectly matches the current level of device development and effectively breaks through the bandwidth bottleneck of using NRZ modulation in PON over 100G.

[0056] In the method of the above embodiment, the probability distribution of the first to fifth PAM5 symbols is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8]. According to the formula for calculating the signal entropy, the total entropy value is 2.25 bit / symbol, which means that a single PAM5 symbol can carry an average of 2.25 bits of information. In a single polarization scenario, a symbol rate of 45 GBaud can achieve a transmission rate of 101.25 Gb / s, meeting the basic requirements of over 100 G. In a dual polarization scenario, the entropy value is effectively increased to 4.5 bit / symbol, and a symbol rate of 45 GBaud can achieve a high rate of 200 Gb / s, fully covering the transmission requirements of over 100 G PON. Moreover, this application only requires a symbol rate of 45 GBaud and a bandwidth of 23 GHz, which is more than 50% lower than the bandwidth requirement of the NRZ system and lower than the 25 GHz bandwidth of the PAM4 system at the same rate. It effectively adapts to the development level of existing devices and breaks through the bandwidth bottleneck of over 100 G PON using NRZ modulation.

[0057] For example, this application provides a signaling method, the specific process of which is as follows: For communication systems, pseudo-random sequences (PRBS) are typically first channel-coded and then symbol-mapped before being output to the channel for transmission. To reduce device bandwidth requirements, this application introduces high-order modulation (PAM5) to increase the number of bits carried per symbol, thereby enabling PON systems exceeding 100G even with relatively small signal bandwidth.

[0058] Optionally, the symbol-bit mapping rule of PAM5 is as follows: Figure 3 As shown, "X" represents a fuzzy bit, which can be either bit "0" or bit "1". According to... Figure 3 According to the mapping rule, a bit sequence of length 3 will be mapped to a non-equally distributed symbol sequence with 5 levels.

[0059] For example, the bit sequence "000" will be mapped to the symbol "-4", and the bit sequence combinations "011" and "010" will both be mapped to the symbol "-2", and so on. After mapping, the probability distribution of the generated PAM5 symbols is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8], with a corresponding signal entropy value of 2.25 bits / symbol. When using a dual-polarization system, each symbol in the system will carry 4.5 bits. Therefore, when the symbol rate is 45 GBaud, the system rate can reach 200 Gb / s, meeting the transmission rate specified by current 100GPON standards, and the corresponding device bandwidth requirement will be reduced to 23 GHz.

[0060] It should be noted that the system device bandwidth required in the signal transmission method of this application is 23 GHz, while the symbol rate of a traditional dual-polarization NRZ system would jump to 100 GBaud to achieve the same transmission rate, and the corresponding device bandwidth requirement would increase to 50 GHz. Therefore, compared with the existing methods, the technical solution of this application can significantly reduce the device bandwidth requirement. At the same time, compared with a 50 GBaud dual-polarization fifth-order pulse amplitude modulation (PAM4) signal with the same rate and a bandwidth requirement of 25 GHz, the bandwidth is also significantly reduced.

[0061] The signal transmitting apparatus provided by the present invention will be described below. The signal transmitting apparatus described below can be referred to in correspondence with the signal transmitting method described above. The signal transmitting apparatus of the embodiments of this application is as follows: Figure 4 As shown, it includes: The acquisition module 410 is used to acquire the bit sequence to be sent; The mapping module 420 is used to map a bit sequence into a fifth-order pulse amplitude modulation (PAM5) symbol based on a preset mapping rule. The preset mapping rule is used to map every 3 consecutive bits into one PAM5 symbol, and there are multiple PAM5 symbols that are formed by mapping two different 3 bits. The transmitting module 430 is used to convert PAM5 symbols into optical signals and transmit them.

[0062] Optionally, the mapping module 420 is specifically used for: Three consecutive bits of 000 are mapped to the first PAM5 symbol; Three consecutive bits 010 and three consecutive bits 011 are mapped together to form the second PAM5 symbol; Three consecutive bits 100 and three consecutive bits 101 are mapped together to the third PAM5 symbol; Three consecutive bits 110 and three consecutive bits 111 are mapped together to the fourth PAM5 symbol; Three consecutive bits 001 are mapped to the fifth PAM5 symbol. Optionally, the probability distribution of the first to the fifth PAM5 symbols is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8].

[0063] Optionally, the signal entropy value of a PAM5 symbol is 2.25-bit / symbol.

[0064] Figure 5 A schematic diagram of the physical structure of an electronic device is provided. This electronic device may include a processor 510, a communications interface 520, a memory 530, and a communication bus 540. The processor 510, communications interface 520, and memory 530 communicate with each other via the communication bus 540. The processor 510 can call logical instructions in the memory 530 to execute a signal transmission method. This method includes: acquiring a bit sequence to be transmitted; mapping the bit sequence to a fifth-order pulse amplitude modulation (PAM5) symbol based on a preset mapping rule; the preset mapping rule is used to map every three consecutive bits to one PAM5 symbol, and multiple PAM5 symbols are formed by mapping two different 3-bit sequences; converting the PAM5 symbol into an optical signal and transmitting it.

[0065] Furthermore, the logical instructions in the aforementioned memory 530 can be implemented as software functional units and, when sold or used as independent products, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0066] On the other hand, the present invention also provides a computer program product, which includes a computer program that can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the signal transmission method provided by the above methods. The method includes: acquiring a bit sequence to be transmitted; mapping the bit sequence to a fifth-order pulse amplitude modulation (PAM5) symbol based on a preset mapping rule; the preset mapping rule is used to map every three consecutive bits to one PAM5 symbol, and there are multiple PAM5 symbols formed by mapping two different 3 bits; converting the PAM5 symbol into an optical signal and transmitting it.

[0067] In another aspect, the present invention also provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the signal transmission method provided by the above methods. The method includes: acquiring a bit sequence to be transmitted; mapping the bit sequence to a fifth-order pulse amplitude modulation (PAM5) symbol based on a preset mapping rule; the preset mapping rule is used to map every three consecutive bits to one PAM5 symbol, and there are multiple PAM5 symbols formed by two different 3-bit mappings; converting the PAM5 symbol into an optical signal and transmitting it.

[0068] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without any creative effort.

[0069] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A signal transmission method, characterized in that, include: Obtain the bit sequence to be sent; Based on a preset mapping rule, the bit sequence is mapped to a fifth-order pulse amplitude modulation (PAM5) symbol; the preset mapping rule is used to map every 3 consecutive bits to a PAM5 symbol, and there are multiple PAM5 symbols that are formed by mapping two different 3 bits. The PAM5 symbol is converted into an optical signal and transmitted.

2. The signal transmission method according to claim 1, characterized in that, The mapping of the bit sequence to fifth-order pulse amplitude modulation (PAM5) symbols based on a preset mapping rule includes: Three consecutive bits of 000 are mapped to the first PAM5 symbol; Three consecutive bits 010 and three consecutive bits 011 are mapped together to form the second PAM5 symbol; Three consecutive bits 100 and three consecutive bits 101 are mapped together to the third PAM5 symbol; Three consecutive bits 110 and three consecutive bits 111 are mapped together to the fourth PAM5 symbol; Three consecutive bits 001 are mapped to the fifth PAM5 symbol.

3. The signal transmission method according to claim 2, characterized in that, The probability distribution of the first PAM5 symbol to the fifth PAM5 symbol is [1 / 8, 2 / 8, 2 / 8, 2 / 8, 1 / 8].

4. The signal transmission method according to any one of claims 1-3, characterized in that, The signal entropy value of the PAM5 symbol is 2.25-bit / symbol.

5. The signal transmission method according to claim 4, characterized in that, The method is applied to the downlink transmission direction of a 100G+ Passive Optical Network (PON).

6. The signal transmission method according to any one of claims 1-3, characterized in that, The step of obtaining the bit sequence to be sent includes: Obtain a pseudo-random sequence; The pseudo-random sequence is channel-coded and interleaved to obtain the bit sequence.

7. A signal transmitting device, characterized in that, include: The acquisition module is used to acquire the bit sequence to be sent; The mapping module is used to map the bit sequence into fifth-order pulse amplitude modulation (PAM5) symbols based on a preset mapping rule; the preset mapping rule is used to map every 3 consecutive bits into one PAM5 symbol, and there are multiple PAM5 symbols formed by two different 3-bit mappings. The transmitting module is used to convert the PAM5 symbol into an optical signal and transmit it.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the signal transmission method as described in any one of claims 1 to 6.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the signal transmission method as described in any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the signal transmission method as described in any one of claims 1 to 6.

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