WO2016045047A1 - 一种支持鲁棒性通道rc的编码调制方法及装置 - Google Patents

一种支持鲁棒性通道rc的编码调制方法及装置 Download PDF

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Publication number
WO2016045047A1
WO2016045047A1 PCT/CN2014/087423 CN2014087423W WO2016045047A1 WO 2016045047 A1 WO2016045047 A1 WO 2016045047A1 CN 2014087423 W CN2014087423 W CN 2014087423W WO 2016045047 A1 WO2016045047 A1 WO 2016045047A1
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bit data
data
coded
subcarrier
subcarriers
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PCT/CN2014/087423
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English (en)
French (fr)
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刘建华
何孝月
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华为技术有限公司
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Priority to EP19174078.6A priority Critical patent/EP3614648B1/en
Priority to CN201480010069.0A priority patent/CN105637844B/zh
Priority to EP14902322.8A priority patent/EP3188451B1/en
Priority to PCT/CN2014/087423 priority patent/WO2016045047A1/zh
Publication of WO2016045047A1 publication Critical patent/WO2016045047A1/zh
Priority to US15/468,749 priority patent/US10263751B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0057—Block codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H04L5/0046—Determination of how many bits are transmitted on different sub-channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/10—Frequency-modulated carrier systems, i.e. using frequency-shift keying
    • H04L27/12—Modulator circuits; Transmitter circuits

Definitions

  • the present invention relates to the field of network technologies, and in particular, to a code modulation method and apparatus supporting a robust channel RC.
  • the communication system generally has a management and maintenance channel.
  • the management and maintenance channels of some systems are embedded in the data channel, so the reliability of the management and maintenance channel is the same as the reliability of the data channel.
  • some systems use some methods to improve reliability, such as taking out some subcarriers, increasing the SNR (Signal to Noise Ratio) margin of these subcarriers, and using these.
  • the subcarriers form an independent channel called RC (Robust Channel), and these subcarriers are called RC subcarriers.
  • Some communication systems can establish different reliability channels according to the importance of the data of the service to be transmitted to carry the reliability requirements. For example, VOIP (Voice over Internet Protocol) has less data and requires reliability. High and low latency, the system can establish a low latency RC channel with low latency and high reliability for VOIP. However, it is necessary to solve how to realize the transmission of RC channel data.
  • the signal modulation system architecture includes PMS-TC (Physical Media Specific Transmission Convergence) and PMD (Physical Media Dependent), in each DMT (Discrete Multi- During the transmission period of the Tone, discrete multi-audio) symbol, the PMT-TC writes a plurality of bit data to the PMD.
  • PMS-TC Physical Media Specific Transmission Convergence
  • PMD Physical Media Dependent
  • the interfaces of the PMS-TC and the PMD can be divided into an RC channel and a service data channel, and RC bit data and services are respectively transmitted from the above two channels in the transmission period of each DMT symbol. Bit data.
  • the DMT data frame encoding rate is affected and the throughput of the decoding is high, if Without coding, the bit data of the data frame is directly mapped onto the service subcarrier, and the security of the information transmission cannot be guaranteed because the coding protection is not performed.
  • the invention provides a code modulation method and device supporting a robust channel RC, which can not only improve the codec rate, but also ensure the security of information transmission.
  • a first aspect of the embodiments of the present invention provides a coding and modulation method supporting a robust channel RC, including:
  • Bit data carried by a DMT symbol is formed into a data frame at an interface between the PMD and the PMS-TC, and the bit data carried by the DMT symbol includes RC bit data acquired from the RC channel and service bits acquired from the service data channel. data;
  • first partial bit data including the RC bit data in the data frame as non-encoded bit data, and second part in the data frame Encoding the bit data to obtain encoded bit data, the data frame being composed of the first partial bit data and the second partial bit data;
  • the determining, by the interface between the PMD and the PMS-TC, the first part of the bit data including the RC bit data in the data frame is Non-coding bit data, and encoding the second partial bit data in the data frame to obtain coded bit data includes:
  • the determining, by the interface between the PMD and the PMS-TC, the first part of the bit data in the data frame that includes the RC bit data is Non-coding bit data, and encoding the second partial bit data in the data frame to obtain coded bit data includes:
  • the modulated subcarrier includes a non-coded subcarrier component and an encoded subcarrier component
  • the modulating the subcarriers by mapping the non-coded bit data and the coded bit data to the plurality of subcarriers corresponding to the data frame in the PMD to obtain the modulated subcarriers includes:
  • mapping the number of coded bit data to the target subcarrier to obtain the coded subcarrier component of the target subcarrier.
  • the second of the data frames Partial bit data is encoded to obtain coded bit data including:
  • a second aspect of the embodiments of the present invention provides a code modulation device that supports a robust channel RC, including:
  • a data obtaining module configured to form, by the PMD and the PMS-TC, the bit data carried by the DMT symbol into a data frame, where the bit data carried by the DMT symbol includes the RC bit data and the slave service data acquired from the RC channel. Traffic bit data obtained by the channel;
  • a data encoding module configured to determine, in an interface of the PMD and the PMS-TC, the first partial bit data including the RC bit data in the data frame as non-encoded bit data, and the first in the data frame Two-part bit data is encoded to obtain coded bit data, and the data frame is composed of The first partial bit data and the second partial bit data are composed;
  • a data modulation module configured to map the non-coded bit data and the coded bit data to a plurality of subcarriers corresponding to the data frame in the PMD to obtain a modulated subcarrier, where the data frame corresponds to a plurality of
  • the subcarriers include at least one RC subcarrier, and the RC bit data is mapped onto the at least one RC subcarrier.
  • the data encoding module is further configured to acquire, by using the number of non-coded bit data, each of the plurality of subcarriers corresponding to the data frame;
  • the subcarriers carry the sum of the number of non-coded bits as the number of the first partial bit data in the data frame.
  • the data encoding module is further configured to obtain the coding efficiency of encoding the bit data in the data frame, and obtain multiple sub-subjects corresponding to the data frame.
  • Each subcarrier in the carrier carries the number of coded bit data; calculates a sum of the number of the plurality of subcarriers carrying the coded bit data; and the sum of the number of the coded bit data according to the plurality of subcarriers and the pair
  • the coding efficiency of the bit data in the data frame is encoded, and the number of the second partial bit data in the data frame is calculated.
  • the modulated subcarrier includes a non-coded subcarrier component and an encoded subcarrier component
  • the data modulation module includes:
  • a number obtaining unit configured to acquire, respectively, a number of non-coded bit data of a target subcarrier and a number of pieces of coded bit data in the plurality of subcarriers
  • a first mapping unit configured to map the non-coded bit data of the target subcarrier to the target subcarrier to obtain a non-coded subcarrier of the target subcarrier according to the number of non-coded bit data of the target subcarrier Component
  • a second mapping unit configured to map the encoded bit data of the target subcarrier to the target subcarrier to obtain an encoded subcarrier component of the target subcarrier according to the number of the encoded bit data of the target subcarrier.
  • the data encoding module is specifically used for The second part of the bit data in the data frame is subjected to low density parity check coding to obtain the number of coded bits according to.
  • a third aspect of the present invention provides a coded modulation apparatus supporting a robust channel RC, the apparatus comprising a network interface, a memory, and a processor, wherein the memory stores a set of program codes, and the processor is configured to call the memory for storage Program code for doing the following:
  • Bit data carried by a DMT symbol is formed into a data frame at an interface between the PMD and the PMS-TC, and the bit data carried by the DMT symbol includes RC bit data acquired from the RC channel and service bits acquired from the service data channel. data;
  • first partial bit data including the RC bit data in the data frame as non-encoded bit data, and second part in the data frame Encoding the bit data to obtain encoded bit data, the data frame being composed of the first partial bit data and the second partial bit data;
  • bit data carried by a DMT symbol is formed into a data frame at an interface between the PMD and the PMS-TC; and then the first part of the bit data including the RC bit data in the data frame is determined.
  • the modulation is performed on the carrier to obtain a modulated subcarrier, wherein the RC bit data is mapped onto the RC subcarrier, thereby not only improving the coding rate, but also ensuring the security of the RC data information transmission.
  • FIG. 1 is a flowchart of coding and modulation supporting a robust channel RC according to an embodiment of the present invention
  • FIG. 2 is a flow chart of another embodiment of a coded modulation supporting robust channel RC proposed by the present invention.
  • FIG. 3 is a schematic structural diagram of a DMT data frame according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of a coding and modulation structure supporting a robust channel RC according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a data modulation module in an apparatus according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of another embodiment of a code modulation device supporting a robust channel RC according to the present invention.
  • the embodiments of the present invention provide a coding and modulation method and apparatus for supporting a robust channel RC, which can not only improve the coding and decoding efficiency of a data frame but also ensure the security of information transmission. The details are described below separately.
  • FIG. 1 is a flowchart of a code modulation method supporting a robust channel RC according to an embodiment of the present invention. As shown in the figure, the method in the embodiment of the present invention includes:
  • the bit data carried by the DMT symbol is formed into a data frame at the interface between the PMD and the PMS-TC, and the bit data carried by the DMT symbol includes the RC bit data acquired from the RC channel and obtained from the service data channel.
  • Business bit data is formed into a data frame at the interface between the PMD and the PMS-TC, and the bit data carried by the DMT symbol includes the RC bit data acquired from the RC channel and obtained from the service data channel.
  • the RC bit data may be obtained from the RC channel, and then the service bit data is obtained from the service data channel, so that the RC bit data is arranged before the service bit data in the data frame.
  • L0 RC bit data is acquired from the RC channel, and data frames obtained by acquiring L1 service bit data are obtained from the service data channel.
  • the RC bit data may be one or more; the service bit data may also be one or more.
  • the first partial bit data including the RC bit data is determined as non-encoded bit data
  • the second partial bit data in the data frame is encoded to obtain coded bit data, the data frame being the first partial bit data and the The second part of the bit data composition.
  • the number of non-coded bit data of each subcarrier supported by the data frame may be acquired; and the sum of the number of non-coded bits of the multiple subcarriers is calculated as the first part of the data in the data frame. number.
  • the number of bit data (non-coded bit data and coded bit data) of each subcarrier can be determined by acquiring SNR (Signal Noise Ratio), Coding_gain (coding gain), and SNR_gap of each subcarrier ( SNR_margin and SNR_margin, according to the SNR, Coding_gain, SNR_gap and SNR_margin of each subcarrier, the number of bit data carried by each DMT subcarrier is calculated by Shannon formula.
  • the threshold value of the number of non-coded bits of the subcarriers may be preset within a range of the number of bits of the subcarriers, and the subcarriers actually carry the non-coded bits. The number of data is not greater than the threshold.
  • the coding efficiency of encoding the bit data in the data frame may be acquired; acquiring the number of coded bit data of each subcarrier corresponding to the multiple subcarriers corresponding to the data frame; and calculating the sum of the number of the plurality of subcarriers carrying the coded bit data And calculating the number of the second partial bit data in the data frame according to the sum of the number of the plurality of subcarriers carrying the encoded bit data and the encoding efficiency of encoding the bit data in the data frame.
  • the coded bit data includes information bits and redundant bits, and the coding efficiency is the length of the information bits divided by the sum of the length of the information bits and the length of the redundant bits, and the redundant bits are used for decoding the bits when decoding at the signal receiving end. The data is verified.
  • the number of the first partial bit data in the data frame is Lu, when the plurality of subcarriers are carried.
  • LDPC Low Density Parity Check
  • LDPC Low Density Parity Check
  • the coding of the LDPC code is highly emphasized, and the LDPC coding method can be preferentially used for coding.
  • S101-S102 is performed at the interface between the PMD and the PMS-TC, that is, the transition adaptation of the data from the intermediate process of the PMS-TC to the PMD. Further, the processing of the S101-S102 at the interface may be completed by PMD control or PMS-TC control.
  • the RC subcarrier and the service subcarrier are interleaved in the bit data loading table, so that the data bits are arranged in the service bit.
  • the RC bit data before the data is all mapped to the RC subcarrier, and the RC subcarrier can be arranged in front of the service subcarrier, so that the RC bit data in the non-coded bit data can be mapped to the bit from the first RC bit data.
  • the data is loaded on the RC subcarriers in the table.
  • the number of non-coded bit data carried by the at least one RC subcarrier must be not less than the number of RC bit data, so that all RC bit data can be mapped onto the RC subcarrier.
  • the remaining non-coded bit data and the remaining coded bit data are mapped onto the service subcarriers.
  • the SNR_margin of the RC subcarrier can be configured by the user, but is required to be higher than the SNR_margin of the service subcarrier.
  • bit data carried by one DMT symbol is formed into one data frame at an interface between the PMD and the PMS-TC; and then the first partial bit data including the RC bit data in the data frame is further included.
  • Determining as non-encoded bit data, and encoding the second partial bit data in the data frame to obtain coded bit data; finally mapping the non-coded bit data and the coded bit data to a corresponding one of the data frame Modulation is performed on the subcarriers to obtain modulated subcarriers, wherein the RC bit data is mapped onto the RC subcarriers, thereby not only improving the coding rate, but also ensuring the security of the RC data information transmission.
  • FIG. 2 is a flow chart of coding and modulation supporting a robust channel RC according to a second embodiment of the present invention. As shown in the figure, the method in the embodiment of the present invention includes:
  • the bit data carried by the same DMT symbol at the interface between the PMD and the PMS-TC is formed into a DMT data frame, where the DMT data frame includes the RC bit data and the slave service data acquired from the RC channel in the DMT period.
  • the service bit data obtained by the channel.
  • the RC bit data may be obtained from the RC channel, and then the service bit data is obtained from the service data channel, so that the RC bit data is arranged before the service bit data in the data frame.
  • L0 RC bit data is acquired from the RC channel, and data frames obtained by acquiring L1 service bit data are obtained from the service data channel.
  • the number of non-coded bit data of each subcarrier supported by the data frame may be acquired; and the sum of the number of non-coded bits of the multiple subcarriers is calculated as the first part of the data in the data frame. number.
  • the number of bit data (non-coded bit data and coded bit data) of each subcarrier can be determined by acquiring SNR (Signal Noise Ratio), Coding_gain (coding gain), and SNR_gap of each subcarrier ( SNR_margin and SNR_margin, according to the SNR, Coding_gain, SNR_gap and SNR_margin of each subcarrier, the number of bit data carried by each DMT subcarrier is calculated by Shannon formula.
  • the threshold value of the number of non-coded bits of the subcarriers may be preset within a range of the number of bits of the subcarriers, and the subcarriers actually carry the non-coded bits. The number of data is not greater than the threshold.
  • encoding efficiency for encoding bit data in a data frame can be obtained; acquiring data Each subcarrier corresponding to the frame carries the number of coded bit data; calculates a sum of the number of the plurality of subcarriers carrying the coded bit data; and the sum of the number of the coded bit data according to the plurality of subcarriers and the pair of data frames
  • the bit data is encoded for encoding efficiency, and the number of second partial bit data in the data frame is calculated.
  • the coded bit data includes information bits and redundant bits, and the coding efficiency is the length of the information bits divided by the sum of the length of the information bits and the length of the redundant bits, and the redundant bits are used for decoding the bits when decoding at the signal receiving end. The data is verified.
  • the number of the first partial bit data in the data frame is Lu, when the plurality of subcarriers are carried.
  • LDPC Low Density Parity Check
  • LDPC Low Density Parity Check
  • the coding of the LDPC code is highly emphasized, and the LDPC coding method can be preferentially used for coding.
  • S201-S202 can be completed by PMD control or PMS-TC control.
  • the threshold value of the number of non-coded bits of the target subcarrier may be preset in the range of the number of the target subcarriers. The number of non-coded bit data actually carried by the target subcarrier is not greater than the threshold.
  • the threshold value of the number of target subcarriers to be coded bits may be preset within a range of the number of the target subcarriers, and the number of the actual subcarriers of the target subcarriers is not greater than the threshold.
  • mapping the number of non-coded bit data to the target subcarrier to obtain a non-coded subcarrier component of the target subcarrier.
  • S205 The coded bit data of the target subcarrier is mapped to the target subcarrier according to the number of the coded bit data of the target subcarrier, and the coded subcarrier component of the target subcarrier is obtained.
  • the implementation flow of S203-S205 is completed by the above PMD control.
  • one subcarrier carries 8 bits of data d 3 d 2 d 1 d 0 c 3 c 2 c 1 c 0 , where d 3 d 2 d 1 d 0 is non-coded bit data, c 3 c 2 c 1 c 0 is coded bit data, and is divided into I d component and Q d component for non-coded bit data, wherein I d component is d 3 d 2 , Q d component is d 1 d 0 ; for coding bit data, it is further divided into I c Component and Q c component, where I c component is c 3 c 2 and Q c component is c 1 c 0 .
  • LDPC coded bit data is mapped to low-bit bits (LSBs) of subcarriers, non-coded bit data is mapped to MSB (most significant bits), and high-order non-coded bits are used.
  • the bit data is amplified by the coset technique to the Euclidean distance. For example, for 64QAM modulation, where the lower 4 bits (b3b2b1b0) are coded bit data, the upper 2 bits (a1a0) are non-coded bit data, the non-coded bit data and the coded bit data are modulated to obtain a rectangular constellation, as shown in the figure. As shown in FIG.
  • the four points of the black circle portion in the figure are cosets of non-coded bit data, and since the low-order coded bit data of the four points is the same (1010), the high-order non-coded bit data constitutes a coset.
  • the Euclidean distance between the points in this coset is magnified 4 times (12 dB).
  • bit data carried by one DMT symbol is formed into one data frame at an interface between the PMD and the PMS-TC; and then the first partial bit data including the RC bit data in the data frame is further included.
  • FIG. 5 is a device for supporting an RC channel in an LDPC coded modulation scheme according to an embodiment of the present invention.
  • the device in the embodiment of the present invention includes a data acquisition module 501, a data encoding module 502, and data modulation. Module 503.
  • the data obtaining module 501 is configured to form, by the PMD and the PMS-TC interface, bit data carried by one DMT symbol into a DMT data frame, where the DMT data frame includes RC bit data acquired from the RC channel in the DMT period, and Service bit data obtained from the service data channel.
  • the RC bit data may be obtained from the RC channel, and then the service bit data is obtained from the service data channel, so that the RC bit data is arranged before the service bit data in the data frame.
  • L0 RC bit data is acquired from the RC channel, and data frames obtained by acquiring L1 service bit data are obtained from the service data channel.
  • the data encoding module 502 is configured to determine, in the PMD and the PMS-TC interface, the first partial bit data including the plurality of RC bit numbers in the DMT data frame as non-coded bit data, and The second partial bit data in the DMT data frame is encoded to obtain encoded bit data, and the DMT data frame is composed of the first partial bit data and the second partial bit data.
  • the number of non-coded bit data of each subcarrier supported by the data frame may be acquired; and the sum of the number of non-coded bits of the multiple subcarriers is calculated as the first part of the data in the data frame. number.
  • the number of bit data (non-coded bit data and coded bit data) of each subcarrier can be determined by acquiring SNR (Signal Noise Ratio), Coding_gain (coding gain), and SNR_gap of each subcarrier ( SNR_margin and SNR_margin, according to the SNR, Coding_gain, SNR_gap and SNR_margin of each subcarrier, the number of bit data carried by each DMT subcarrier is calculated by Shannon formula.
  • the threshold value of the number of non-coded bits of the subcarriers may be preset within a range of the number of bits of the subcarriers, and the subcarriers actually carry the non-coded bits. The number of data is not greater than the threshold.
  • the coding efficiency of encoding the bit data in the data frame may be acquired; acquiring the number of coded bit data of each subcarrier corresponding to the multiple subcarriers corresponding to the data frame; and calculating the sum of the number of the plurality of subcarriers carrying the coded bit data And calculating the number of the second partial bit data in the data frame according to the sum of the number of the plurality of subcarriers carrying the encoded bit data and the encoding efficiency of encoding the bit data in the data frame.
  • the coded bit data includes information bits and redundant bits, and the coding efficiency is the length of the information bits divided by the sum of the length of the information bits and the length of the redundant bits, and the redundant bits are used for decoding the bits when decoding at the signal receiving end. The data is verified.
  • the number of the first partial bit data in the data frame is Lu, when the plurality of subcarriers are carried.
  • LDPC Low Density Parity Check
  • LDPC Low Density Parity Check
  • the coding of the LDPC code is highly emphasized, and the LDPC coding method can be preferentially used for coding.
  • the data acquisition module 501 and the data encoding module 502 can be controlled by PMD or PMS-TC.
  • a data modulation module 503 configured to map the non-coded bit data and the coded bit data to a plurality of subcarriers corresponding to the data frame in the PMD to obtain a modulated subcarrier, where the data frame corresponds to
  • the plurality of subcarriers includes at least one RC subcarrier, and the RC bit data is mapped onto the at least one RC subcarrier.
  • the modulated subcarrier includes a non-coded subcarrier component and an encoded subcarrier component.
  • the RC subcarriers in the multiple subcarriers corresponding to the data frame are not consecutive, the RC subcarrier and the service subcarrier are interleaved in the bit data loading table, so that the data bits are arranged in the service bit.
  • the RC bit data before the data is all mapped to the RC subcarrier, and the RC subcarrier can be arranged in front of the service subcarrier, so that the data can be opened from the first RC bit.
  • the RC bit data in the non-coded bit data is mapped onto the RC subcarriers in the bit data loading table.
  • the number of non-coded bit data carried by the at least one RC subcarrier must be not less than the number of RC bit data, so that all RC bit data can be mapped onto the RC subcarrier.
  • the remaining non-coded bit data and the remaining coded bit data are mapped onto the service subcarriers.
  • the SNR_margin of the RC subcarrier can be configured by the user, but is required to be higher than the SNR_margin of the service subcarrier.
  • the data modulation module 503 may further include:
  • the number obtaining unit 601 is configured to separately acquire the number of the target subcarriers carrying the non-coded bit data and the number of the coded bit data in the plurality of subcarriers.
  • the threshold value of the number of non-coded bits of the target subcarrier may be preset in the range of the number of the target subcarriers. The number of non-coded bit data actually carried by the target subcarrier is not greater than the threshold.
  • the threshold value of the number of target subcarriers to be coded bits may be preset within a range of the number of the target subcarriers, and the number of the actual subcarriers of the target subcarriers is not greater than the threshold.
  • the first mapping unit 602 is configured to: according to the number of non-coded bit data carried by the target subcarrier, map the number of non-coded bit data to the target subcarrier to obtain a non-coded sub-carrier of the target subcarrier. Carrier component.
  • the second mapping unit 603 is configured to map the coded bit data of the target subcarrier to the target subcarrier to obtain the coded subcarrier component of the target subcarrier according to the number of the coded bit data of the target subcarrier. Thereby, the non-coded subcarrier component and the coded bit component are finally combined to obtain a modulation target subcarrier.
  • one subcarrier carries 8 bits of data d 3 d 2 d 1 d 0 c 3 c 2 c 1 c 0 , where d 3 d 2 d 1 d 0 is non-coded bit data, c 3 c 2 c 1 c 0 is coded bit data, and is divided into I d component and Q d component for non-coded bit data, wherein I d component is d 3 d 2 , Q d component is d 1 d 0 ; for coding bit data, it is further divided into I c Component and Q c component, where I c component is c 3 c 2 and Q c component is c 1 c 0 .
  • LDPC coded bit data is mapped to low-bit bits (LSBs) of subcarriers, non-coded bit data is mapped to MSB (most significant bits), and high-order non-coded bits are used.
  • the bit data is amplified by the coset technique to the Euclidean distance. For example, for 64QAM modulation, where the lower 4 bits (b3b2b1b0) are coded bit data, the upper 2 bits (a1a0) are non-coded bit data, the non-coded bit data and the coded bit data are modulated to obtain a rectangular constellation, as shown in the figure. As shown in FIG.
  • the four points of the black circle portion in the figure are cosets of non-coded bit data, and since the low-order coded bit data of the four points is the same (1010), the high-order non-coded bit data constitutes a coset.
  • the Euclidean distance between the points in this coset is magnified 4 times (12 dB).
  • bit data carried by one DMT symbol is formed into one data frame at an interface between the PMD and the PMS-TC; and then the first partial bit data including the RC bit data in the data frame is further included.
  • Determining as non-encoded bit data, and encoding the second partial bit data in the data frame to obtain coded bit data; finally mapping the non-coded bit data and the coded bit data to a corresponding one of the data frame Modulation is performed on the subcarriers to obtain modulated subcarriers, wherein the RC bit data is mapped onto the RC subcarriers, thereby not only improving the coding rate, but also ensuring the security of the RC data information transmission.
  • FIG. 7 is a schematic structural diagram of another embodiment of a code modulation device supporting a robust channel RC according to the present invention.
  • the apparatus can include at least one processor 701, such as a CPU, at least one receiver 703, at least one memory 704, at least one transmitter 705, and at least one communication bus 702.
  • the communication bus 702 is used to implement connection communication between these components.
  • the receiver 703 and the transmitter 705 of the device in the embodiment of the present invention may be wired transmission ports. It can also be a wireless device, for example comprising an antenna device, for signalling or data communication with other node devices.
  • the memory 704 may be a high speed RAM memory or a non-volatile memory such as at least one disk memory.
  • the memory 704 can optionally also be at least one storage device located remotely from the aforementioned processor 701.
  • a set of program codes is stored in the memory 704, and the processor is configured to call program code stored in the memory for performing the following operations:
  • Bit data carried by a DMT symbol is formed into a data frame at an interface between the PMD and the PMS-TC, and the bit data carried by the DMT symbol includes RC bit data acquired from the RC channel and service bits acquired from the service data channel. data;
  • first partial bit data including the RC bit data in the data frame as non-encoded bit data, and second part in the data frame Encoding the bit data to obtain encoded bit data, the data frame being composed of the first partial bit data and the second partial bit data;
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, Read-Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

Abstract

本发明实施例提供了一种支持鲁棒性通道RC的编码调制方法，包括：在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧；在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据；在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述RC比特数据映射到所述至少一个RC子载波上。本发明还提供了一种支持RC通道的编码调制装置，采用本发明，不仅可以提高数据帧的编解码速率，而且保障了信息传输的安全性。

Description

一种支持鲁棒性通道RC的编码调制方法及装置 技术领域
本发明涉及网络技术领域，尤其涉及一种支持鲁棒性通道RC的编码调制方法及装置。
背景技术
通信系统一般存在一个管理维护通道，有些系统的管理维护通道是嵌入到数据通道中的，这样管理维护通道的可靠性和数据通道的可靠性是一样的。有些系统为了提高管理维护通道的可靠性，专门采用一些提高可靠性的方法，例如拿出一些子载波，增大这些子载波的SNR(Signal to Noise Ratio，信噪比)裕量，并使用这些子载波构成一个独立的通道，该通道叫做RC(Robust Channel，鲁棒性通道)，这些子载波叫做RC子载波。有些通信系统可以根据需要传送的业务的数据的重要性，建立不同可靠性的通道以承载可靠性要求把不同的业务，例如VOIP(Voice over Internet Protocol，网络电话)业务数据量少，要求可靠性高并且低时延，系统可以为VOIP建立一个低延时可靠性高的低速RC通道。但是需要解决如何实现RC通道数据的传输。
在现有技术方案中，信号调制系统架构包括PMS-TC(Physical Media Specific Transmission Convergence，物理媒质特定传输汇集层)和PMD(Physical Media Dependent，物理媒质相关层)，在每个DMT(Discrete Multi-Tone，离散多音频)符号的传输周期内，PMT-TC向PMD写入多个比特数据。当该信号调制系统支持RC通道时，PMS-TC和PMD的接口可以分为RC通道和业务数据通道，在每个DMT符号的传输周期内分别从上述两个通道中分别传输RC比特数据和业务比特数据。在从RC通道获取RC比特数据和从数据通道获取比特数据组成一个DMT数据帧之后，如果对DMT数据帧的所有比特数据进行编码，影响DMT数据帧编码速率且导致译码的吞吐量高，如果不编码而是直接将数据帧的比特数据映射到业务子载波上，又会导致因没有进行编码保护，不能保障信息传输的安全性。
发明内容
本发明提供了一种支持鲁棒性通道RC的编码调制方法及装置，不仅可以提高编解码速率，还可以保障信息传输的安全性。
本发明实施例第一方面提供了一种支持鲁棒性通道RC的编码调制方法，包括：
在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
在第一方面的第一种可能的实现方式中，所述在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据包括：
获取所述数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；
计算所述子载波承载非编码比特的个数之和，作为所述数据帧中第一部分比特数据的个数。
在第一方面的第二种可能的实现方式中，所述在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据包括：
获取所述对所述数据帧中的比特数据进行编码的编码效率；
获取所述数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；
计算所述多个子载波承载编码比特数据的个数之和；
根据所述多个子载波承载编码比特数据的个数之和以及所述对所述数据帧中的比特数据进行编码的编码效率，计算所述数据帧中的第二部分比特数据的个数。
在第一方面的第三种可能的实施方式中，所述调制子载波包括非编码子载波分量以及编码子载波分量；
所述在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波包括：
分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数；
根据所述目标子载波承载非编码比特数据的个数，将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量；
根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。
结合第一方面以及第一方面的第一种至第三种中的任一种可能的实现方式，在第一方面的第四种可能实现方式中，所述对所述数据帧中的第二部分比特数据进行编码得到编码比特数据包括：
对所述数据帧中的第二部分比特数据进行低密度奇偶校验编码得到编码比特数据。
本发明实施例第二方面提供了一种支持鲁棒性通道RC的编码调制装置，包括：
数据获取模块，用于在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
数据编码模块，用于在PMD与PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由 所述第一部分比特数据和所述第二部分比特数据组成；
数据调制模块，用于在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
在第二方面的第一种可能的实现方式中，所述数据编码模块，还用于获取所述数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；计算所述多个子载波承载非编码比特的个数之和，作为所述数据帧中第一部分比特数据的个数。
在第二方面的第二种可能的实现方式中，所述数据编码模块，还用于获取所述对所述数据帧中的比特数据进行编码的编码效率；获取所述数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；计算所述多个子载波承载编码比特数据的个数之和；根据所述多个子载波承载编码比特数据的个数之和以及所述对所述数据帧中的比特数据进行编码的编码效率，计算所述数据帧中的第二部分比特数据的个数。
在第二方面的第三种可能的实施方式中，所述调制子载波包括非编码子载波分量以及编码子载波分量；
所述数据调制模块包括：
个数获取单元，用于分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数；
第一映射单元，用于根据所述目标子载波承载非编码比特数据的个数，将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量；
第二映射单元，用于根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。
结合第二方面以及第二方面的第一种至第三种中的任一种可能的实现方式，在第二方面的第四种可能实现方式中，所述数据编码模块，具体用于对所述数据帧中的第二部分比特数据进行低密度奇偶校验编码得到编码比特数 据。
本发明第三方面提供了一种支持鲁棒性通道RC的编码调制装置，所述装置包括网络接口、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。实施本发明实施例，首先在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧；然后将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据；最后将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，其中RC比特数据映射到RC子载波上，从而不仅提高了编码速率，而且保障了RC数据信息传输的安全性。
附图说明
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，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提出的一种支持鲁棒性通道RC的编码调制的流程图；
图2是本发明提出的一种支持鲁棒性通道RC的编码调制的另一实施例的流程图；
图3是本发明实施例提供的一种DMT数据帧的结构示意图；
图4是本发明实施例提供的一种64QAM星座图；
图5是本发明实施例提出的一种支持鲁棒性通道RC的编码调制结构示意图；
图6是本发明实施例提出的装置中数据调制模块的结构示意图；
图7是本发明提出的一种支持鲁棒性通道RC的编码调制装置的另一实施例的结构示意图。
具体实施方式
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。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供了一种支持鲁棒性通道RC的编码调制方法和装置，不仅可以提高数据帧的编解码效率而且可以保障信息传输的安全性。以下分别进行详细说明。
请参考图1，图1是本发明实施例提出的一种支持鲁棒性通道RC的编码调制方法的流程图。如图所示，本发明实施例中的方法包括：
S101，在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据。
具体实现中，可以先从RC通道获取RC比特数据，然后再从业务数据通道中获取业务比特数据，使得在数据帧中RC比特数据排列在业务比特数据之前。例如，如图3所示，从RC通道中获取L0个RC比特数据，从业务数据通道中获取L1个业务比特数据得到的数据帧。所述RC比特数据可以是一个或多个；所述业务比特数据也可以是一个和多个。
S102，在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述 RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成。
具体实现中，可以获取数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；计算多个子载波承载非编码比特的个数之和，作为数据帧中第一部分比特数据的个数。其中，各个子载波承载比特数据(非编码比特数据和编码比特数据)的个数可以通过如下确定：获取各个子载波的SNR(Signal Noise Ratio，信噪比)、Coding_gain(编码增益)、SNR_gap(信噪比差额)以及SNR_margin(信噪比裕度)，根据各个子载波的SNR，Coding_gain、SNR_gap以及SNR_margin，通过香农公式计算得到各个DMT子载波承载比特数据的个数
Figure PCTCN2014087423-appb-000001
在计算得到各个子载波承载比特数据的个数之后，可以在各个子载波承载比特数据的个数范围内预设子载波承载非编码比特的个数的门限值，子载波实际承载非编码比特数据的个数不大于该门限值。
另外，可以获取对数据帧中的比特数据进行编码的编码效率；获取数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；计算多个子载波承载编码比特数据的个数之和；根据多个子载波承载编码比特数据的个数之和以及对所述数据帧中的比特数据进行编码的编码效率，计算数据帧中的第二部分比特数据的个数。其中，编码比特数据包括信息位和冗余位，编码效率为信息位的长度除以信息位的长度与冗余位的长度之和，该冗余位用于在信号接收端解码时对编码比特数据进行校验。
例如：如图3所示，当数据帧对应的多个子载波承载非编码比特数据的个数之和为Lu时，数据帧中的第一部分比特数据的个数为Lu，当上述多个子载波承载编码比特数据的个数之和为La，编码效率为R时，数据帧中的第二部分比特数据的个数为Lc＝La*R。需要说明的是，DMT数据帧中第一部分比特数据的个数不小于上述RC比特数据的个数。
可选的，对所述DMT数据帧中的第二部分比特数据进行LDPC(Low Density Parity Check，低密度奇偶校验编码)得到编码比特数据。其中，LDPC码的编码强调高，可以优先使用LDPC编码方法进行编码。
需要说明的是，S101-S102的实现流程是在PMD和PMS-TC之间的接口处进行的，即数据从PMS-TC到PMD的中间过程中进行的过渡适配。进一步的，S101-S102在接口处的处理，可以由PMD控制完成或者PMS-TC控制完成。
S103，在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
具体实现中，由于在上述数据帧对应的多个子载波中的RC子载波不是连续的，在比特数据加载表中RC子载波和业务子载波成交织状，为了使数据帧中的排列在业务比特数据前的RC比特数据全部映射到RC子载波上，可以将RC子载波排列在业务子载波前，从而可以从第一个RC比特数据开始，将非编码比特数据中的RC比特数据映射到比特数据加载表中的RC子载波上。其中，上述至少一个RC子载波承载非编码比特数据的个数必须不小于RC比特数据的个数，从而可以将所有的RC比特数据映射到RC子载波上。当将非编码比特数据以及编码比特数据映射到全部的RC子载波上时，将剩下的非编码比特数据以及剩下的编码比特数据映射到业务子载波上。另外，RC子载波的SNR_margin可以由用户配置，但要求比业务子载波的SNR_margin要高。
在本发明实施例中，首先在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧；然后将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据；最后将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，其中RC比特数据映射到RC子载波上，从而不仅提高了编码速率，而且保障了RC数据信息传输的安全性。
请参考图2，图2是本发明第二实施例提出的一种支持鲁棒性通道RC的编码调制流程图。如图所示，本发明实施例中的方法包括：
S201，将在PMD与PMS-TC接口处的同一个DMT符号承载的比特数据组成一个DMT数据帧，所述DMT数据帧包括在该DMT周期内从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据。
具体实现中，可以先从RC通道获取RC比特数据，然后再从业务数据通道中获取业务比特数据，使得在数据帧中RC比特数据排列在业务比特数据之前。例如，如图3所示，从RC通道中获取L0个RC比特数据，从业务数据通道中获取L1个业务比特数据得到的数据帧。
S202，在所述PMD与所述PMS-TC接口处将所述DMT数据帧中包括所述多个RC比特数在内的第一部分比特数据确定为非编码比特数据，并对所述DMT数据帧中的第二部分比特数据进行编码得到编码比特数据，所述DMT数据帧由所述第一部分比特数据和第二部分比特数据组成。
具体实现中，可以获取数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；计算多个子载波承载非编码比特的个数之和，作为数据帧中第一部分比特数据的个数。其中，各个子载波承载比特数据(非编码比特数据和编码比特数据)的个数可以通过如下确定：获取各个子载波的SNR(Signal Noise Ratio，信噪比)、Coding_gain(编码增益)、SNR_gap(信噪比差额)以及SNR_margin(信噪比裕度)，根据各个子载波的SNR，Coding_gain、SNR_gap以及SNR_margin，通过香农公式计算得到各个DMT子载波承载比特数据的个数
Figure PCTCN2014087423-appb-000002
在计算得到各个子载波承载比特数据的个数之后，可以在各个子载波承载比特数据的个数范围内预设子载波承载非编码比特的个数的门限值，子载波实际承载非编码比特数据的个数不大于该门限值。
另外，可以获取对数据帧中的比特数据进行编码的编码效率；获取数据 帧对应的多个子载波中各个子载波承载编码比特数据的个数；计算多个子载波承载编码比特数据的个数之和；根据多个子载波承载编码比特数据的个数之和以及对数据帧中的比特数据进行编码的编码效率，计算数据帧中的第二部分比特数据的个数。其中，编码比特数据包括信息位和冗余位，编码效率为信息位的长度除以信息位的长度与冗余位的长度之和，该冗余位用于在信号接收端解码时对编码比特数据进行校验。
例如：如图3所示，当数据帧对应的多个子载波承载非编码比特数据的个数之和为Lu时，数据帧中的第一部分比特数据的个数为Lu，当上述多个子载波承载编码比特数据的个数之和为La，编码效率为R时，数据帧中的第二部分比特数据的个数为Lc＝La*R。需要说明的是，DMT数据帧中第一部分比特数据的个数不小于上述RC比特数据的个数。
可选的，对所述DMT数据帧中的第二部分比特数据进行LDPC(Low Density Parity Check，低密度奇偶校验编码)得到编码比特数据。其中，LDPC码的编码强调高，可以优先使用LDPC编码方法进行编码。
需要说明的是，S201-S202的实现流程可以由PMD控制完成或者PMS-TC控制完成。
S203，分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数。
需要说明的是，在上述计算得到各个子载波承载比特数据的个数之后，可以在目标子载波承载比特数据的个数范围内预设目标子载波承载非编码比特的个数的门限值，目标子载波实际承载非编码比特数据的个数不大于该门限值。同样，可以在目标子载波承载比特数据的个数范围内预设目标子载波承载编码比特的个数的门限值，目标子载波实际承载编码比特数据的个数不大于该门限值。
S204，根据所述目标子载波承载非编码比特数据的个数，将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量。
S205，根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。 S203-S205的实现流程由上述PMD控制完成。
例如：一个子载波承载8个比特数据d3d2d1d0c3c2c1c0，其中，d3d2d1d0为非编码比特数据，c3c2c1c0为编码比特数据，对于非编码比特数据又分为Id分量和Qd分量，其中Id分量为d3d2，Qd分量为d1d0；对于编码比特数据又分为Ic分量和Qc分量，其中Ic分量为c3c2，Qc分量为c1c0。对非编码比特数据和编码比特数据分别进行格雷映射得到非编码子载波分量(Iu,Qu)和编码子载波分量(Ic,Qc)，最后非编码子载波分量(Iu,Qu)和编码子载波分量(Ic,Qc)合并处理得到调制目标子载波(I,Q)，该调制目标子载波可以表示为矩形星座坐标，其中(I,Q)＝l×(Iu,Qu)+(Ic,Qc)，l＝4(当非编码比特数据的个数为2时，l＝2；当非编码比特数据的个数为4时，l＝4；当非编码比特数据的个数为6时，l＝8)。
需要说明的是，通常LDPC编码比特数据映射到子载波的低位比特(LSB：least-significant bits)，非编码比特数据的映射到子载波的高位比特(MSB：most significant bits)，高位的非编码比特数据通过陪集技术放大欧式距离。例如：对于64QAM调制，其中低位的4比特(b3b2b1b0)为编码比特数据，高位的2比特(a1a0)为非编码比特数据，非编码比特数据和编码比特数据经过调制得到的矩形星座图，如图4所示，图中黑色圆圈部分的4个点为非编码比特数据的陪集，由于该4个点的低位的编码比特数据相同(1010)，高位的非编码比特数据就构成一个陪集，这个陪集中的点与点之间的欧式距离被放大4倍(12dB)。在信号接收端进行解调时，首先根据低位的编码比特数据，确定高位的非编码比特数据所处的陪集，然后在确定的陪集中根据最小欧式距离准则，确定该陪集中的具体某个点，解映射出高位的非编码比特数据。通过陪集关系非编码比特数据可以与编码比特数据得到相同级别的保护，因此非编码比特数据与编码比特数据的误码率相同。
在本发明实施例中，首先在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧；然后将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据；最后将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，其中RC比特数据映射到RC子载波上，从而不仅提高了编码速 率，而且保障了RC数据信息传输的安全性。
参考图5，图5是本发明实施例提出的一种LDPC编码调制方案中支持RC通道的装置，如图所示，本发明实施例的装置包括数据获取模块501、数据编码模块502和数据调制模块503。
数据获取模块501，用于在PMD与PMS-TC接口处将一个DMT符号承载的比特数据组成一个DMT数据帧，所述DMT数据帧包括在该DMT周期内从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据。
具体实现中，可以先从RC通道获取RC比特数据，然后再从业务数据通道中获取业务比特数据，使得在数据帧中RC比特数据排列在业务比特数据之前。例如，如图3所示，从RC通道中获取L0个RC比特数据，从业务数据通道中获取L1个业务比特数据得到的数据帧。
数据编码模块502，用于在所述PMD与所述PMS-TC接口处将所述DMT数据帧中包括所述多个RC比特数在内的第一部分比特数据确定为非编码比特数据，并对所述DMT数据帧中的第二部分比特数据进行编码得到编码比特数据，所述DMT数据帧由所述第一部分比特数据和第二部分比特数据组成。
具体实现中，可以获取数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；计算多个子载波承载非编码比特的个数之和，作为数据帧中第一部分比特数据的个数。其中，各个子载波承载比特数据(非编码比特数据和编码比特数据)的个数可以通过如下确定：获取各个子载波的SNR(Signal Noise Ratio，信噪比)、Coding_gain(编码增益)、SNR_gap(信噪比差额)以及SNR_margin(信噪比裕度)，根据各个子载波的SNR，Coding_gain、SNR_gap以及SNR_margin，通过香农公式计算得到各个DMT子载波承载比特数据的个数
Figure PCTCN2014087423-appb-000003
 在计算得到各个子载波承载比特数据的个数之后，可以在各个子载波承载比特数据的个数范围内预设子载波承载非编码比特的个数的门限值，子载波实际承载非编码比特数据的个数不大于该门限值。
另外，可以获取对数据帧中的比特数据进行编码的编码效率；获取数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；计算多个子载波承载编码比特数据的个数之和；根据多个子载波承载编码比特数据的个数之和以及对数据帧中的比特数据进行编码的编码效率，计算数据帧中的第二部分比特数据的个数。其中，编码比特数据包括信息位和冗余位，编码效率为信息位的长度除以信息位的长度与冗余位的长度之和，该冗余位用于在信号接收端解码时对编码比特数据进行校验。
例如：如图3所示，当数据帧对应的多个子载波承载非编码比特数据的个数之和为Lu时，数据帧中的第一部分比特数据的个数为Lu，当上述多个子载波承载编码比特数据的个数之和为La，编码效率为R时，数据帧中的第二部分比特数据的个数为Lc＝La*R。需要说明的是，DMT数据帧中第一部分比特数据的个数不小于上述RC比特数据的个数。
可选的，对所述DMT数据帧中的第二部分比特数据进行LDPC(Low Density Parity Check，低密度奇偶校验编码)得到编码比特数据。其中，LDPC码的编码强调高，可以优先使用LDPC编码方法进行编码。
需要说明的是，数据获取模块501和数据编码模块502可以由PMD控制或者PMS-TC控制。
数据调制模块503，用于在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。其中，调制子载波包括非编码子载波分量和编码子载波分量。
具体实现中，由于在上述数据帧对应的多个子载波中的RC子载波不是连续的，在比特数据加载表中RC子载波和业务子载波成交织状，为了使数据帧中的排列在业务比特数据前的RC比特数据全部映射到RC子载波上，可以将RC子载波排列在业务子载波前，从而可以从第一个RC比特数据开 始，将非编码比特数据中的RC比特数据映射到比特数据加载表中的RC子载波上。其中，上述至少一个RC子载波承载非编码比特数据的个数必须不小于RC比特数据的个数，从而可以将所有的RC比特数据映射到RC子载波上。当将非编码比特数据以及编码比特数据映射到全部的RC子载波上时，将剩下的非编码比特数据以及剩下的编码比特数据映射到业务子载波上。另外，RC子载波的SNR_margin可以由用户配置，但要求比业务子载波的SNR_margin要高。
可选的，如图6所示，数据调制模块503可以进一步包括：
个数获取单元601，用于分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数。
需要说明的是，在上述计算得到各个子载波承载比特数据的个数之后，可以在目标子载波承载比特数据的个数范围内预设目标子载波承载非编码比特的个数的门限值，目标子载波实际承载非编码比特数据的个数不大于该门限值。同样，可以在目标子载波承载比特数据的个数范围内预设目标子载波承载编码比特的个数的门限值，目标子载波实际承载编码比特数据的个数不大于该门限值。
第一映射单元602，用于根据所述目标子载波承载非编码比特数据的个数，将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量。
第二映射单元603，用于根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。从而最后将所述非编码子载波分量以及所述编码比特分量合并处理得到调制目标子载波。
例如：一个子载波承载8个比特数据d3d2d1d0c3c2c1c0，其中，d3d2d1d0为非编码比特数据，c3c2c1c0为编码比特数据，对于非编码比特数据又分为Id分量和Qd分量，其中Id分量为d3d2，Qd分量为d1d0；对于编码比特数据又分为Ic分量和Qc分量，其中Ic分量为c3c2，Qc分量为c1c0。对非编码比特数据和编码比特数据分别进行格雷映射得到非编码子载波分量(Iu,Qu)和编码子载波分量(Ic,Qc)，最后非编码子载波分量(Iu,Qu)和编码子载波分量(Ic,Qc)合并处理得到 调制目标子载波(I,Q)，该调制目标子载波可以表示为矩形星座坐标，其中(I,Q)＝l×(Iu,Qu)+(Ic,Qc)，l＝4(当非编码比特数据的个数为2时，l＝2；当非编码比特数据的个数为4时，l＝4；当非编码比特数据的个数为6时，l＝8)。
需要说明的是，通常LDPC编码比特数据映射到子载波的低位比特(LSB：least-significant bits)，非编码比特数据的映射到子载波的高位比特(MSB：most significant bits)，高位的非编码比特数据通过陪集技术放大欧式距离。例如：对于64QAM调制，其中低位的4比特(b3b2b1b0)为编码比特数据，高位的2比特(a1a0)为非编码比特数据，非编码比特数据和编码比特数据经过调制得到的矩形星座图，如图4所示，图中黑色圆圈部分的4个点为非编码比特数据的陪集，由于该4个点的低位的编码比特数据相同(1010)，高位的非编码比特数据就构成一个陪集，这个陪集中的点与点之间的欧式距离被放大4倍(12dB)。在信号接收端进行解调时，首先根据低位的编码比特数据，确定高位的非编码比特数据所处的陪集，然后在确定的陪集中根据最小欧式距离准则，确定该陪集中的具体某个点，解映射出高位的非编码比特数据。通过陪集关系非编码比特数据可以与编码比特数据得到相同级别的保护，因此非编码比特数据与编码比特数据的误码率相同。
在本发明实施例中，首先在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧；然后将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据；最后将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，其中RC比特数据映射到RC子载波上，从而不仅提高了编码速率，而且保障了RC数据信息传输的安全性。
图7是本发明提出的一种支持鲁棒性通道RC的编码调制装置的另一实施例的结构示意图。如图所示，该装置可以包括：至少一个处理器701，例如CPU，至少一个接收器703，至少一个存储器704，至少一个发送器705，至少一个通信总线702。其中，通信总线702用于实现这些组件之间的连接通信。其中，本发明实施例中装置的接收器703和发送器705可以是有线发送端口， 也可以为无线设备，例如包括天线装置，用于与其他节点设备进行信令或数据的通信。存储器704可以是高速RAM存储器，也可以是非不稳定的存储器(non-volatile memory)，例如至少一个磁盘存储器。存储器704可选的还可以是至少一个位于远离前述处理器701的存储装置。存储器704中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
在PMD与PMS-TC的接口处将一个DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
需要说明的是，对于前述的各个方法实施例，为了简单描述，故将其都表述为一系列的动作组合，但是本领域技术人员应该知悉，本发明并不受所描述的动作顺序的限制，因为依据本发明，某一些步骤可以采用其他顺序或者同时进行。其次，本领域技术人员也应该知悉，说明书中所描述的实施例均属于优选实施例，所涉及的动作和模块并不一定是本发明所必须的。
在上述实施例中，对各个实施例的描述都各有侧重，某个实施例中没有详细描述的部分，可以参见其他实施例的相关描述。
本领域普通技术人员可以理解上述实施例的各种方法中的全部或部分步骤是可以通过程序来指令相关的硬件来完成，该程序可以存储于一计算机可读存储介质中，存储介质可以包括：闪存盘、只读存储器(Read-Only Memory，ROM)、随机存取器(Random Access Memory，RAM)、磁盘或光盘等。
以上对本发明实施例所提供的内容下载方法及相关设备、系统进行了详细介绍，本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想；同时，对于本领域的一般技术人员，依据本发明的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本发明的限制。

Claims (11)

  1. 一种支持鲁棒性通道RC的编码调制方法，其特征在于，所述方法包括：
    在物理媒质相关层PMD与物理媒质特定传输汇集层PMS-TC的接口处将一个离散多音频DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
    在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
    在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
  2. 如权利要求1所述的方法，其特征在于，所述在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据包括：
    获取所述数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；
    计算所述多个子载波承载非编码比特的个数之和，作为所述数据帧中第一部分比特数据的个数。
  3. 如权利要求1所述的方法，其特征在于，所述在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行 编码得到编码比特数据包括：
    获取所述对所述数据帧中的比特数据进行编码的编码效率；
    获取所述数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；
    计算所述多个子载波承载编码比特数据的个数之和；
    根据所述多个子载波承载编码比特数据的个数之和以及所述对所述数据帧中的比特数据进行编码的编码效率，计算所述数据帧中的第二部分比特数据的个数。
  4. 如权利要求1所述的方法，其特征在于，所述调制子载波包括非编码子载波分量以及编码子载波分量；
    所述在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波包括：
    分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数；
    根据所述目标子载波承载非编码比特数据的个数，将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量；
    根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。
  5. 如权利要求1～4任意一项所述的方法，其特征在于，所述对所述数据帧中的第二部分比特数据进行编码得到编码比特数据包括：
    对所述数据帧中的第二部分比特数据进行低密度奇偶校验编码得到编码比特数据。
  6. 一种支持鲁棒性通道RC的编码调制装置，其特征在于，所述装置包括：
    数据获取模块，用于在物理媒质相关层PMD与物理媒质特定传输汇集层PMS-TC的接口处将一个离散多音频DMT符号承载的比特数据组成一个 数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
    数据编码模块，用于在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
    数据调制模块，用于在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
  7. 如权利要求6所述的装置，其特征在于，
    所述数据编码模块，还用于获取所述数据帧对应的多个子载波中各个子载波承载非编码比特数据的个数；计算所述多个子载波承载非编码比特的个数之和，作为所述数据帧中第一部分比特数据的个数。
  8. 如权利要求6所述的装置，其特征在于，
    所述数据编码模块，还用于获取所述对所述数据帧中的比特数据进行编码的编码效率；获取所述数据帧对应的多个子载波中各个子载波承载编码比特数据的个数；计算所述多个子载波承载编码比特数据的个数之和；根据所述多个子载波承载编码比特数据的个数之和以及所述对所述数据帧中的比特数据进行编码的编码效率，计算所述数据帧中的第二部分比特数据的个数。
  9. 如权利要求6所述的装置，其特征在于，所述调制子载波包括非编码子载波分量以及编码子载波分量；
    所述数据调制模块包括：
    个数获取单元，用于分别获取所述多个子载波中目标子载波承载非编码比特数据的个数以及承载编码比特数据的个数；
    第一映射单元，用于根据所述目标子载波承载非编码比特数据的个数， 将该个数的非编码比特数据映射到所述目标子载波上得到所述目标子载波的非编码子载波分量；
    第二映射单元，用于根据所述目标子载波承载编码比特数据的个数，将该个数的编码比特数据映射到所述目标子载波上得到所述目标子载波的编码子载波分量。
  10. 如权利要求6～9任意一项所述的装置，其特征在于，
    所述数据编码模块，具体用于对所述数据帧中的第二部分比特数据进行低密度奇偶校验编码得到编码比特数据。
  11. 一种支持鲁棒性通道RC的编码调制装置，其特征在于，所述装置包括网络接口、存储器以及处理器，其中，存储器中存储一组程序代码，且处理器用于调用存储器中存储的程序代码，用于执行以下操作：
    在物理媒质相关层PMD与物理媒质特定传输汇集层PMS-TC的接口处将一个离散多音频DMT符号承载的比特数据组成一个数据帧，所述DMT符号承载的比特数据包括从RC通道获取到的RC比特数据和从业务数据通道获取到的业务比特数据；
    在所述PMD与所述PMS-TC的接口处将所述数据帧中包括所述RC比特数据在内的第一部分比特数据确定为非编码比特数据，并对所述数据帧中的第二部分比特数据进行编码得到编码比特数据，所述数据帧由所述第一部分比特数据和所述第二部分比特数据组成；
    在所述PMD中将所述非编码比特数据以及所述编码比特数据映射到所述数据帧对应的多个子载波上进行调制得到调制子载波，所述数据帧对应的多个子载波包括至少一个RC子载波，所述RC比特数据映射到所述至少一个RC子载波上。
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