WO2013185332A1 - 抵抗ofdm系统中噪声的方法、装置和ofdm系统 - Google Patents

抵抗ofdm系统中噪声的方法、装置和ofdm系统 Download PDF

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Publication number
WO2013185332A1
WO2013185332A1 PCT/CN2012/076951 CN2012076951W WO2013185332A1 WO 2013185332 A1 WO2013185332 A1 WO 2013185332A1 CN 2012076951 W CN2012076951 W CN 2012076951W WO 2013185332 A1 WO2013185332 A1 WO 2013185332A1
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Prior art keywords
noise
type
harq
retransmission
hybrid automatic
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PCT/CN2012/076951
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English (en)
French (fr)
Inventor
何孝月
石操
刘建华
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华为技术有限公司
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Priority to PCT/CN2012/076951 priority Critical patent/WO2013185332A1/zh
Priority to CN201280000771.XA priority patent/CN103636148B/zh
Publication of WO2013185332A1 publication Critical patent/WO2013185332A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/20Arrangements for detecting or preventing errors in the information received using signal quality detector
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, apparatus, and OFDM system for resisting noise in an OFDM (Orthogonal Frequency Division Multiplexing) system.
  • OFDM Orthogonal Frequency Division Multiplexing
  • OFDM system is a widely used system in communication systems.
  • the main working principle of OFDM system is to divide the channel into several orthogonal subchannels, convert high-speed data signals into parallel low-speed sub-data streams, and modulate to each sub-channel. transmission.
  • the orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce mutual interference between subchannels.
  • the signal bandwidth on each subchannel is less than the associated bandwidth of the channel, so that each subchannel can be seen as flat fading, thereby eliminating intersymbol interference.
  • channel equalization becomes relatively easy.
  • noise margin Noise Margin is usually configured to combat some noise that occurs in the OFDM system. Configuring noise margins, while maintaining system stability, can also cause system speed to drop, which can result in reduced system performance.
  • Embodiments of the present invention provide a method, apparatus, and OFDM system for resisting noise in an OFDM system, which can effectively resist system noise while ensuring the rate of system data transmission, thereby ensuring the performance of the OFDM system.
  • a method for resisting noise in an OFDM system includes: receiving a retransmission request information and a noise information detection result of a noise causing a data transmission error; transmitting the transmission result according to the retransmission request information and the noise information detection result Parameters are updated; according to the updated Send the parameter to send the data transmission unit.
  • Another method for resisting noise in an OFDM system includes: detecting noise information of a noise causing a transmission error of a data transmission unit; transmitting retransmission request information and the noise The noise information detection result; receiving the data transmission unit transmitted according to the updated transmission parameter.
  • An apparatus for resisting noise in an OFDM system includes: a receiver, a processor, and a transmitter, where the receiver is configured to receive retransmission request information and generate data
  • the transmission unit transmits a noise information detection result of the erroneous noise; the processor is configured to determine a transmission parameter according to the noise information detection result received by the receiver; and the transmitter is configured to send data according to the transmission parameter determined by the processor. Transmission unit.
  • Another apparatus for resisting noise in an OFDM system includes: a receiver, a processor, and a transmitter, where the processor is configured to cause a transmission error of a data transmission unit The noise information of the noise is detected; the transmitter is configured to send the retransmission request information and the noise information detection result detected by the processor; and the receiver is configured to receive the transmission according to the updated transmission parameter. Data transfer unit.
  • a third method for resisting noise in an OFDM system includes: detecting noise that causes a transmission error of a data transmission unit, and obtaining noise information for causing noise of a transmission error of the data transmission unit a result: determining, according to the noise information detection result of the noise, a transmission parameter; transmitting a retransmission request information and the determined transmission parameter; and receiving a data transmission unit that is sent according to the determined transmission parameter.
  • a device for resisting noise in an OFDM system includes: a receiver, a processor, and a transmitter, where the processor is configured to cause a transmission error of a data transmission unit The noise is detected, the noise information detection result of the noise causing the transmission error of the data transmission unit is obtained; and the transmission parameter is determined according to the noise information detection result; the transmitter is configured to send the retransmission request information and the information of the error data transmission unit a transmission parameter determined by the processor; the receiver, configured to receive data sent according to the determined transmission parameter Transmission unit.
  • a fourth apparatus for resisting noise in an OFDM system includes: a receiver, a processor, and a transmitter, where the processor is configured to cause a transmission error of a data transmission unit The noise information of the noise is detected; the transmission parameter is determined according to the noise information detection result of the noise caused by the receiver to cause the data transmission unit to transmit an error; the transmitter is configured to send the retransmission request information and the processor detects the a noise information detection result causing the data transmission unit to transmit an erroneous noise; transmitting a data transmission unit according to the transmission parameter determined by the processor; and the receiver is configured to receive the retransmission request information and the noise information detection result from the opposite end.
  • a fifth apparatus for resisting noise in an OFDM system includes: a receiver, a processor, and a transmitter, where the processor is configured to cause a transmission error of a data transmission unit The noise information of the noise is detected, the noise information detection result of the noise is obtained, and the transmission parameter is determined according to the noise information detection result; the data transmission unit is transmitted according to the transmission parameter received by the receiver; the transmitter is configured to send The sending parameter and the retransmission request information determined by the processor, where the receiver is configured to receive the sending parameter and the retransmission request information sent by the peer end.
  • An Orthogonal Frequency Division Multiplexing (OFDM) OFDM system includes a receiving device and a transmitting device that are connected to each other, wherein the receiving device is the second device provided by the foregoing embodiment of the present invention, and the transmitting device The first device provided by the embodiment of the present invention; or the receiving device is the third device provided by the embodiment of the present invention, where the sending device is configured to receive an error data transmission unit sent by the receiving device Retransmitting the request information and the sending parameter, and sending the data transmission unit to the receiving end according to the received sending parameter; or the receiving device is the fourth device provided by the embodiment of the present invention, where the sending device is The fourth device provided by the embodiment of the present invention; or the receiving device is the fifth device provided by the embodiment of the present invention, and the transmitting device is the fifth device provided by the foregoing embodiment of the present invention.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the method and device for resisting noise in an OFDM system provided by the embodiment of the present invention
  • the OFDM system detects the different noises that cause the data transmission unit to be erroneous, and then adopts methods such as determining the retransmission type as the corresponding HARQ type and reducing the bit loading value for different noise situations, and implementing the anti-channel noise. At the same time, the rate of data transmission in the OFDM system is ensured.
  • FIG. 1 is a flowchart of a method for resisting noise in an OFDM system according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a data frame in an OFDM system according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram showing the structure of a noise preventing device in an OFDM system according to an embodiment of the present invention
  • FIG. 4 shows an OFDM system according to an embodiment of the present invention
  • FIG. 5 is a flowchart of another method for resisting noise in an OFDM system according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of another apparatus for resisting noise in an OFDM system according to an embodiment of the present invention. detailed description:
  • the method, device and OFDM system for resisting noise in an OFDM system provided by the embodiments of the present invention can effectively resist noise while ensuring system data transmission rate and thereby ensuring performance of the OFDM system.
  • the method and apparatus for resisting noise in an OFDM system and the OFDM system provided by the embodiments of the present invention respectively adopt different types of Hybrid Automatic Repeat ReQuest (HARQ) resistance for different types of noise causing data transmission unit errors.
  • HARQ Hybrid Automatic Repeat ReQuest
  • the noise in the OFDM system is mainly divided into two types: impulse noise and Gaussian noise/Gauss-like noise.
  • Gaussian noise or Gaussian noise is collectively referred to as "Gaussian noise
  • the method, device and system for resisting noise in an OFDM system support the first type of hybrid automatic request retransmission Type I HARQ, and support the second type hybrid automatic request retransmission Type II HARQ, the third type
  • the first type of Type I HARQ is used to counter impulse noise;
  • the method, the device and the system for resisting the noise in the OFDM system provided by the embodiment of the present invention, when the system only supports the first type of hybrid automatic request retransmission Type I HARQ, determining the length of the corresponding different retransmission queue according to different types of impulse noise, In this way, the influence of the impulse noise is resisted; according to the variation of the Gaussian noise, the bit loading value of each data transmission unit subcarrier is correspondingly reduced to resist the Gaussian noise.
  • the first embodiment of the present invention provides a method for resisting noise in an OFDM system. As shown in FIG. 1, the method includes:
  • Step S110 performing error detection on the data transmission unit;
  • the receiving end performs error detection and correction on the data transmission unit by Forward Error Correction (FEC) or error detection on the data transmission unit through the cyclic redundancy check CRC. If there is no error, the ACK is sent to the transmitting end. The message, the ACK message is received on the receiving end, and the acknowledgment data transmission unit is correctly received. If there is an error, step S120 is performed. Step S120, detecting noise that causes a transmission error of the data transmission unit;
  • FEC Forward Error Correction
  • the receiving end detects the type of noise causing the transmission error of the data transmission unit to determine whether the noise causing the error of the data transmission unit is impulse noise or Gaussian noise.
  • the receiving end detects the noise type that causes the data transmission unit error to be implemented by:
  • the receiving end can count the distribution of noise causing the error of the data transmission unit (for example, by counting the distribution of the Slicer Error/Viterbi Error) to determine which kind of noise causes the data transmission unit error. If the noise distribution satisfies the Gaussian distribution, then it is Gaussian. Data transmission unit error caused by noise; if the Gaussian distribution is not satisfied, it is a data transmission unit error caused by impulse noise;
  • the receiving end can also detect the extent to which the data transmission unit packet is corrupted to determine which type of noise is causing the data transmission unit error.
  • This method of detecting the type of noise needs to define a new data frame format.
  • a field information is added to the data frame format (the length is one byte or more bytes) to indicate the quality status of the data frame, and the transmitting end Modulate certain specific sequences (such as repeating 1-bit or 2-bit sequences, etc.) on a partial tone with a high signal-to-noise ratio in one symbol, and each tone is subjected to low-order modulation, making these tones highly resistant to noise.
  • the receiving end detects whether the field is destroyed.
  • the field is destroyed, indicating that the data transmission unit is severely damaged, it is determined to be a data transmission unit error caused by impulse noise, if the field is not destroyed, If the data transmission unit is only slightly damaged, it is determined that the data transmission unit is caused by Gaussian noise.
  • a field Qflag210 is inserted in the data frame specified in G.998.4, and the Qflag field 210 may be located in the RRC (Retransmission Return Channel) of the data frame.
  • the Qflag field 210 may also be located after the RRC.
  • the Qflag field 210 is used to indicate the quality status of the data frame.
  • the noise type determined to cause the data transmission unit error is impulse noise. If the Qflag field 210 is not corrupted, the noise type determined to cause the data transmission unit error is Gaussian noise.
  • the receiving end can further detect, specifically,
  • the noise type is impulse noise
  • the length and interval of the impulse noise are detected; or after detecting the length and interval of the impulse noise, the type of the impulse noise is further determined according to the length and interval of the impulse noise;
  • the variation of the Gaussian noise with respect to the steady state is detected.
  • the change of the Gaussian noise with respect to the steady state may include a change direction, such as an increase or decrease in noise, and a change amplitude, such as a change of 3db, 6db, and the like.
  • Step S130 determining a transmission parameter according to the detection result of the noise type detection; if the noise type detection result in step 120 is impulse noise, and the OFDM system supports the first type hybrid automatic request retransmission Type I HARQ, and supports the second type Hybrid automatic request retransmission Type II HARQ, third type incremental redundancy hybrid automatic request retransmission Type lll IR-HARQ or third type chasing merge hybrid automatic request retransmission Type ⁇ any one or more of CC-HARQ Then, it is determined that the retransmission type in the transmission parameter is Type I HARQ to counter the pulse confrontation.
  • the Type I HARQ type is the most single HARQ processing mode. The receiving end notifies the transmitting end to retransmit.
  • the transmitting end After receiving the retransmission request information of a data transmission unit, the transmitting end initiates retransmission of the data transmission unit and retransmits.
  • the content is exactly the same as the original data transmission unit, that is, the retransmitted data transmission unit only copies the original data, and the receiving end will receive the wrong data transmission.
  • the unit performs the discarding process, so each time the retransmitted data packet is correctly decoded, the probability is the same as the original data;
  • the noise type detection result in step 120 is Gaussian noise
  • the OFDM system supports the first type hybrid automatic request retransmission Type I HARQ, and supports the second type hybrid automatic request retransmission Type II HARQ
  • the third type increment Redundant hybrid automatic request retransmission Typelll IR-HARQ or third type chasing merge hybrid automatic request retransmission Type ⁇ CC-HARQ any one or more, then determine the retransmission type as Type II HARQ, Type III IR- Any of HARQ or Type ⁇ CC-HARQ acts as a way to resist noise.
  • Type ll HARQ that is, only the added redundant information is transmitted every retransmission, and the retransmission data transmission unit does not include the system information byte/bit, so the receiving end needs to retransmit the redundant information and the initial redundancy.
  • the information is combined to form a FEC codeword with stronger error correction capability. For example, the first transmission selects the redundancy version 0, the second transmission selects the redundancy version 1, and then the two redundancy are combined to form. With more redundant FEC codewords, the error correction capability is stronger, which makes it possible to correct bit errors caused by Gaussian noise or Gaussian noise.
  • Type III IR-HARQ that is, each retransmission is transmitted in addition to the added redundant information.
  • the retransmission data transmission unit has self-decoding capability because it contains all system information bytes/bits and partially added redundant information, and the receiving end first decodes the retransmission packets. If the decoding is unsuccessful, the data transmission units that are transmitted multiple times are combined and then decoded. If the decoding still cannot be correctly decoded, the transmission is continued. Continued retransmission data transmission unit. Since this method optimizes the system information bytes/bits each time, the combining gain will be larger, and the higher the probability of successful decoding, the more favorable it is to combat random errors caused by Gaussian noise, etc.
  • Type III CC- HARQ this mode of HARQ has only one redundancy version, either full redundancy or one of the redundancy versions. It is recommended to use all redundancy, that is, to retransmit the data transmission unit with the same redundancy version each time.
  • the receiving end will receive the signal-to-noise ratio of each received data transmission unit and all previously received data transmission units according to the channel at each reception.
  • the noise type detection result in step 120 is impulse noise
  • the OFDM system only supports the first type hybrid automatic request retransmission Type l HARQ, determining the corresponding retransmission queue length according to the type of impulse noise in the noise information; Or determining the length of the corresponding retransmission queue according to the length and interval of the impulse noise in the noise information.
  • the specific impulse noise types generally include: (1) REIN (Repetitive Electrical Impulse Noise) is a periodic impulse noise that is repeated at a frequency of 100 Hz or 120 Hz. It is the impulse noise of the power grid coupled into the twisted pair. The length of the REIN is approximately 1DMT ⁇ 3DMT symbol. (2) PEIN (Prolonged Electrical Impulse noise) is a non-periodic impulse noise with a duration ranging from 1ms to 10ms. (3) SHINE (Single High Impulse Noise Environment) is a random extra long impulse noise. The single impulse noise lasts for more than 10ms, and its main sources are lightning, car start, and so on.
  • REIN Repetitive Electrical Impulse Noise
  • PEIN Prolonged Electrical Impulse noise
  • SHINE Single High Impulse Noise Environment
  • the queue length must be sufficient to satisfy the data retransmission of lms, and the retransmission delay should be within 2ms.
  • the prior art can determine the length of the corresponding retransmission queue according to the type of impulse noise in the noise information, or determine the length of the corresponding retransmission queue according to the length and interval of the impulse noise in the noise information.
  • the noise type detection result in step 120 is Gaussian noise, and the OFDM system only supports the first type hybrid automatic request retransmission Type l HARQ, determining each data transmission unit subcarrier according to the noise variation in the noise information
  • the bit loading value may specifically determine whether the noise change is increasing. If the noise is increased, it is judged whether the increasing amplitude exceeds the threshold. If the threshold is not exceeded, the bit loading value of each data transmission unit subcarrier is decreased.
  • the threshold value may be determined in advance according to a specific network environment or service requirement or other conditions, or dynamically adjusted by the network management system or automatically updated according to certain predetermined conditions. For example, the threshold may be taken as 6 db.
  • Step S140 sending a retransmission request message.
  • the analysis is performed, the corresponding retransmission process is prepared, and the transmission parameters specified by the receiving end are used for data transmission.
  • the method for retransmitting the request may be multiple, one may be to confirm the status of multiple data transmission units at one time, and indirectly request the data transmission unit that needs to be retransmitted, and at least the retransmission request information needs to include: Whether the transmission unit is correctly transmitted state ACK or NAK information, where ACK represents that the acknowledgment data transmission unit fed back to the transmitting end by the receiving end is correctly received, and the NAK represents that the data transmission unit fed back to the transmitting end by the receiving end is not correctly received; The data transmission unit that needs to be retransmitted is directly requested. In this case, at least the retransmission request information needs to include: a sequence number of the data transmission unit that needs to be retransmitted.
  • the transmission parameters can be sent together with the retransmission request, and the modulation is sent in the same symbol. For example, in one symbol, some tone modulation retransmission request information is used, and other tone modulation transmission parameter information is used.
  • the sending parameters can also be sent out with a single symbol, which is not limited here.
  • the receiving end may use two-bit information to indicate the type of HARQ. For example, one of the cases may be that the type 1 HARQ is represented by "00", and the type II is represented by "01". HARQ, "10" represents the Type IIIIR-HARQ, and "11” represents the TypelllCC-HARQ, which is only a case where the HARQ type is represented by two-bit information. In specific applications, it may not be limited to this case, and other Variety of ways. If the system supports only two HARQ types, the receiving end can represent the HARQ type with only 1 bit of information.
  • Step S150 Receive a data transmission unit that is sent according to the transmission parameter determined above.
  • the transmitting end performs data transmission according to the received corresponding transmission type according to the retransmission request information of the erroneous data transmission unit sent by the receiving end in step S140, and the receiving end pairs according to the phase
  • the error data transmission unit that should transmit the parameters for retransmission is received.
  • the method for resisting noise in an OFDM system detects corresponding noise information caused by a data transmission unit error, and then adopts corresponding countermeasures for different noise types, such as adopting a corresponding retransmission type, and reducing the bit loading value. Or the length of the retransmission queue after updating, etc., to achieve the resistance to channel noise while ensuring the rate of data transmission in the OFDM system.
  • the second embodiment of the present invention provides a device for resisting noise in an OFDM system, and the device can perform the method in the first embodiment described above to achieve noise resistance. effect.
  • the apparatus 300 for resisting noise in an OFDM system includes: a processor 310, a transmitter 320, and a receiver 330.
  • the processor 310 may include a detection module 3101 and a transmission parameter determination module 3102.
  • the processor 310 is configured to detect noise causing a transmission error of the data transmission unit, obtain a noise information detection result of noise causing transmission error of the data transmission unit, and determine a transmission parameter according to the noise information detection result.
  • the detecting module 3101 is configured to detect a type of noise that causes a data transmission unit error; since the error included in the data transmission unit received by the receiving end exceeds the FEC error correction capability, the error detection function or loop of the FEC after the FEC is passed
  • the redundancy check (CRC) finds that the data transmission unit is in error, and the detection module 31 01 in the receiving end starts detecting the type of noise causing the error of the data transmission unit to determine whether the noise causing the error of the data transmission unit is impulse noise or Gaussian noise. .
  • the detecting module 3101 can count the distribution of noise causing the data transmission unit error (for example, by statistically distributing the distribution of the Slicer/Viterbi Error) to determine which kind of noise causes the data transmission unit error, if the noise distribution satisfies the Gaussian Distribution, then the data transmission unit error caused by Gaussian noise; if the Gaussian distribution is not satisfied, it is the data transmission unit error caused by the impulse noise;
  • the detecting module 3101 can also detect the extent to which the data transmission unit packet is destroyed to determine which kind of noise-induced data transmission unit error, and thereby determine the HARQ retransmission type.
  • the noise type method needs to define a new data frame format.
  • a field information is added to the data frame format (the length is one byte or more bytes) to indicate the quality status of the data frame, and the sender will have some
  • a specific sequence (such as repeating a 1-bit or 2-bit sequence, etc.) is modulated on a partial tone with a high signal-to-noise ratio in one symbol, and each tone is subjected to low-order modulation, so that these tones have high noise immunity, and the receiving end Detecting whether the field is destroyed.
  • the field is destroyed, indicating that the data transmission unit is severely damaged, it is determined to be a data transmission unit error caused by impulse noise. If the field is not destroyed, the data transmission is indicated. If the unit is only slightly damaged, it is judged to be a data transmission unit error caused by Gaussian noise.
  • the receiving end can further detect, for example, if the noise type is impulse noise, detecting the length and interval of the impulse noise; or after detecting the length and interval of obtaining the impulse noise, further according to the length of the impulse noise And the interval determines the type of the impulse noise; if the noise type is Gaussian noise, the variation of the Gaussian noise with respect to the steady state is detected.
  • the change of the Gaussian noise with respect to the steady state may include a change direction, such as an increase or decrease in noise, and a change amplitude, such as a change of 3db, 6db, and the like.
  • the sending parameter determining module 3102 is configured to determine a sending parameter according to the detection result of the noise information by the detecting module.
  • the third type increment Redundant hybrid automatic request retransmission Type lll IR-HARQ or third type chasing merge hybrid automatic request retransmission Type ⁇ CC-HARQ any one or more, then determine the retransmission type in the transmission parameter is Type I HARQ To fight against the pulse.
  • the Type I HARQ type is the most single HARQ processing mode. The receiving end notifies the sending end to retransmit. After receiving the retransmission request information of a data transmission unit, the transmitting end starts the number.
  • the content of the retransmission is exactly the same as the original data transmission unit, that is, the retransmitted data transmission unit only copies the original data, and the receiving end will discard the error data transmission unit, so The probability that each retransmitted packet is correctly decoded is the same as the original data;
  • the third type increases Redundant hybrid automatic request retransmission Typelll IR-HARQ or third type chasing merge hybrid automatic request retransmission Type ⁇ CC-HARQ any one or more, then determine the retransmission type as Type II HARQ, Type III IR - Any of HARQ or Type ⁇ CC-HARQ as a way to resist noise.
  • Type ll HARQ that is, only the added redundant information is transmitted every retransmission, and the retransmission data transmission unit does not include the system information byte/bit, so the receiving end needs to retransmit the redundant information and the initial redundancy.
  • the information is combined to form a FEC codeword with stronger error correction capability. For example, the first transmission selects the redundancy version 0, the second transmission selects the redundancy version 1, and then the two redundancy are combined to form. With more redundant FEC codewords, the error correction capability is stronger, which makes it possible to correct bit errors caused by Gaussian noise or Gaussian noise.
  • Type III IR-HARQ that is, each retransmission is transmitted in addition to the added redundant information.
  • the retransmission data transmission unit has self-decoding capability because it contains all system information bytes/bits and partially added redundant information, and the receiving end first decodes the retransmission packets. If the decoding is unsuccessful, the data transmission units that are transmitted multiple times are combined and then decoded. If the decoding still cannot be correctly performed, the subsequent retransmission number is continued. Transmission unit. Since this method optimizes the system information bytes/bits each time, the combining gain will be larger, and the higher the probability of successful decoding, the more favorable it is to combat random errors caused by Gaussian noise, etc.
  • Type III CC- HARQ this mode of HARQ has only one redundancy version, either full redundancy or one of the redundancy versions. It is recommended to use all redundancy, that is, to retransmit the data transmission unit with the same redundancy version each time.
  • the receiving end will receive the signal-to-noise ratio of each received data transmission unit and all previously received data transmission units according to the channel at each reception.
  • SNR Signal-to-noise ratio
  • the corresponding retransmission queue length is determined according to the type of impulse noise in the noise information. Or determine the length of the corresponding retransmission queue based on the length and interval of the impulse noise in the noise information.
  • the noise type detection result detected by the detection module is Gaussian noise, and the OFDM system only supports the first type hybrid automatic request retransmission Type l HARQ, determining each data transmission unit subcarrier according to the noise variation in the noise information
  • the bit loading value can be specifically determined whether the noise change is increased. If the noise is increased, it is judged whether the increased amplitude exceeds the threshold. If the threshold is not exceeded, the bit loading value of each data transmission unit subcarrier is lowered.
  • the threshold value may be determined in advance according to a specific network environment or service requirement or other conditions, or dynamically adjusted by the network management system or automatically updated according to certain predetermined conditions. For example, the threshold may be taken as 6 db.
  • the threshold may be When the amplitude of the noise change is increased by 3 db, the bit load value of each data transmission unit subcarrier is reduced by one unit, such as 2 bits.
  • 6bd, 3db, and 2bit are just an example, and other values may be taken according to specific conditions, and the present invention is not limited.
  • the transmitter 320 is configured to send retransmission request information of the erroneous data transmission unit and the transmission parameter determined by the processor 310.
  • the retransmission request information includes different information because the manner of retransmitting the request is different.
  • the method for retransmitting the request may be multiple. One is to confirm the status of multiple data transmission units at one time, and indirectly request the data transmission unit that needs to be retransmitted, and then at least some recent data transmission needs to be included in the retransmission request information. Whether the unit is correctly transmitted status ACK or NAK message, wherein the ACK message is correctly received by the acknowledgment data transmission unit fed back to the transmitting end by the receiving end, and the NAK message is not correctly received on behalf of the data transmission unit fed back to the transmitting end by the receiving end.
  • the transmit parameters can be sent with the retransmission request, and the modulation is sent in the same symbol, for example, in one symbol, some tone modulation retransmission request information is used, and other tone modulation is used to transmit the parameter information.
  • the sending parameters can also be sent out with a single symbol, which is not limited here.
  • the sending module 310 is further configured to use the two-bit information to indicate the type of the HARQ.
  • the type I HARQ is represented by "00", and "01" indicates The Type II HARQ, "10” indicates the Type lll IR-HARQ, "11” indicates the Type ⁇ CC-HARQ, which is only a case where the HARQ type is represented by two-bit information, and the specific application may not be limited to There are many other ways to do this.
  • the receiving end can express the HARQ type with only 1 bit of information.
  • the receiver 330 is configured to receive a data transmission unit according to the sending parameter.
  • the transmitting end transmits the data transmission unit according to the corresponding transmission parameter according to the retransmission request information of the erroneous data transmission unit sent from the transmitter 320, and the receiver 330 receives the data transmission unit.
  • the sending end sends data according to the specific sending parameters received. Specifically, according to the received retransmission type, the retransmitted data is retransmitted according to the received bit loading value; and the retransmitted data and the normal data are received according to the received bit loading value (The data normally transmitted by the system, that is, non-retransmitted data is transmitted; according to the length of the received retransmission queue, the retransmitted data is retransmitted.
  • the apparatus for resisting noise in an OFDM system determines corresponding noise information caused by a data transmission unit error, and then adopts corresponding countermeasures for different noise types, such as adopting a corresponding retransmission type, and reducing the bit.
  • the loaded value or the updated retransmission queue length, etc., and then the corresponding HARQ type is used for different noise types, and the data transmission rate of the OFDM system is ensured while achieving noise resistance.
  • the third embodiment of the present invention provides an OFDM system.
  • the OFDM system provided by this embodiment includes: a receiving end 410 and a transmitting end 420;
  • the receiving end 410 is configured to detect the noise information that causes the data transmission unit error, obtain the noise information detection result that causes the data transmission unit to transmit the error noise, and determine the transmission parameter according to the noise information detection result; send the signal to the transmitting end 420. Determined send parameters and retransmission requests.
  • the receiving end 410 of the present system can employ the apparatus as described in the second embodiment.
  • the transmitting end 420 is configured to receive retransmission request information and a sending parameter of the erroneous data transmission unit sent by the receiving end 410, and send the data transmission unit to the receiving end 410 according to the received sending parameter.
  • the sending end 420 performs data transmission according to the received specific sending parameter.
  • the requested retransmission data may be retransmitted according to the received retransmission type; or the retransmitted data according to the received bit loading value pair and the common
  • the data (the data normally sent by the system, that is, the non-retransmitted data) is transmitted; or the retransmitted data is retransmitted according to the length of the received retransmission queue.
  • the OFDM system provided by the embodiment of the present invention adopts corresponding countermeasures for different types of noise by determining different noise information that causes errors in the data transmission unit, such as adopting a corresponding retransmission type, a reduced bit loading value or after updating.
  • the length of the retransmission queue, etc. achieves the resistance to channel noise while ensuring the rate of data transmission in the OFDM system.
  • the embodiment of the present invention further provides another method, device and another OFDM system for resisting noise in an OFDM system.
  • a receiving end detects noise information of a noise causing a transmission error of a data transmission unit, and causes the data transmission unit to transmit
  • the noise information detection result and the retransmission request of the erroneous noise are sent to the transmitting end; the transmitting end determines the transmission parameter according to the received noise information detection result of the noise causing the data transmission unit to transmit the error, and performs data according to the determined transmission parameter.
  • the fourth embodiment of the present invention provides a method of resisting noise in an OFDM system, as shown in FIG. 5: Step S510, receiving retransmission request information and a noise information detection result that causes the data transmission unit to transmit an error noise;
  • the retransmission request information includes at least the status ACK or NAK information of whether the most recent data transmission units are correctly transmitted, wherein the ACK represents that the acknowledgment data transmission unit fed back to the transmitting end by the receiving end is correctly received, and the NAK represents the receiving end feeding back to the transmitting end.
  • the data transmission unit is not correctly received; or the retransmission request information herein includes at least: a sequence number of the data transmission unit that needs to be retransmitted.
  • the noise information detection result causing the data transmission unit to transmit erroneous noise includes the type of noise, or includes information such as the type of noise and the variation of Gaussian noise, the type of impulse noise, or the length and interval of the impulse noise.
  • Step S520 Determine a transmission parameter according to the received noise information detection result.
  • the transmitting end receives and parses the noise information detection result fed back by the receiving end, and uses the above noise information detection result to determine the transmission parameter.
  • the determination of the specific transmission parameters can be referred to the steps S130 of the first embodiment and the functions implemented by the transmission parameter determination module 3102 in the second embodiment.
  • Step S520 the data transmission unit sends according to the determined parameter.
  • the sending end performs data transmission according to the determined specific sending parameter. Specifically, retransmits the requested retransmitted data according to the determined retransmission type; retransmits the data according to the determined bit loading value and normal data (the system is normal)
  • the transmitted data that is, the non-retransmitted data, is transmitted; the retransmitted data is retransmitted according to the determined length of the retransmission queue.
  • Another method for resisting noise in an OFDM system detects a type of noise and related information, and then updates a corresponding transmission parameter, such as using a corresponding retransmission type, a reduced bit loading value or an update. After the length of the retransmission queue, etc., the resistance to noise in the system is achieved.
  • the fifth embodiment of the present invention provides another apparatus 600 for resisting noise in an OFDM system.
  • the method described in the fourth embodiment is specifically implemented, including: a receiver 610, a processor 620, and a transmitter 630;
  • a receiver 610 configured to receive retransmission request information and a noise information detection result that causes the data transmission unit to transmit an erroneous noise
  • the retransmission request information includes at least the status ACK or NAK information of whether the most recent data transmission units are correctly transmitted, wherein the ACK represents that the acknowledgment data transmission unit fed back to the transmitting end by the receiving end is correctly received, and the NAK represents the receiving end feeding back to the transmitting end.
  • the data transmission unit is not correctly received; or the retransmission request information herein includes at least: a sequence number of the data transmission unit that needs to be retransmitted.
  • the noise information detection result causing the data transmission unit to transmit erroneous noise includes the type of noise, or includes information such as the type of noise and the variation of Gaussian noise, the type of impulse noise, or the length and interval of the impulse noise.
  • the processor 620 is configured to determine a sending parameter according to the foregoing retransmission request information and the noise information detection result; specifically,
  • the OFDM system supports the first type hybrid automatic request retransmission Type I HARQ, and supports the second type hybrid automatic request retransmission Type II HARQ, the third type incremental redundancy If the hybrid automatic request retransmission Type IIIIR-HARQ or the third type chasing merge hybrid automatic request retransmission TypelllCC-HARQ is used, it is determined that the retransmission type in the transmission parameter is Type l HARQ to counter the pulse confrontation.
  • the Type I HARQ type is the most single HARQ processing mode. The receiving end notifies the transmitting end to retransmit.
  • the transmitting end After receiving the retransmission request information of a data transmission unit, the transmitting end initiates retransmission of the data transmission unit and retransmits.
  • the content is exactly the same as the original data transmission unit, that is, the retransmitted data transmission unit only copies the original data, and the receiving end will discard the error data transmission unit, so each retransmission data packet is correctly decoded.
  • the probability is the same as the original data;
  • the OFDM system supports the first type hybrid automatic request retransmission Type I HARQ, and supports the second type hybrid automatic request Retransmitting Type II HARQ, Type 3 Incremental Redundancy, Automatic Request Retransmission, TypellllR-HARQ, or Type 3, Chasing, Merging, and Retransmission, TypelllCC-HARQ, to determine the retransmission type is Any of Type II HARQ, TypellllR-HARQ, or TypelllCC-HARQ acts as a way to resist noise.
  • Type ll HARQ that is, only the added redundant information is transmitted every retransmission, and the retransmission data transmission unit does not include the system information byte/bit, so the receiving end needs to retransmit the redundant information and the initial redundancy.
  • the information is combined to form a FEC codeword with stronger error correction capability. For example, the first transmission selects the redundancy version 0, the second transmission selects the redundancy version 1, and then the two redundancy are combined to form. With more redundant FEC codewords, the error correction capability is stronger, which makes it possible to correct bit errors caused by Gaussian noise or Gaussian noise.
  • Type III IR-HARQ that is, each retransmission is transmitted in addition to the added redundant information.
  • the retransmission data transmission unit has self-decoding capability because it contains all system information bytes/bits and partially added redundant information, and the receiving end first decodes the retransmission packets. If the decoding is unsuccessful, the data transmission units that are transmitted multiple times are combined and then decoded, and if still cannot be correctly decoded, the subsequent retransmission data is continued to be transmitted. Transmission unit. In this method, since the system information byte/bit is optimized and selected every time, the combining gain will be larger, and the higher the probability of successful decoding, the more favorable it is to combat random errors caused by Gaussian noise, etc.
  • Type ⁇ CC- HARQ this mode of HARQ has only one redundancy version, either full redundancy or one of the redundancy versions. It is recommended to use all redundancy, that is, to retransmit the data transmission unit with the same redundancy version each time.
  • the receiving end obtains a weighting factor according to the signal-to-noise ratio (SNR) of each receiving channel, and calculates the maximum likelihood ratio and other methods for soft combining each time the data transmission unit received and all previously received data transmission units. , synthesizing an FEC codeword with stronger error correction capability, the mode is very simple to implement, and the combined gain is high.
  • SNR signal-to-noise ratio
  • the received noise type detection result is impulse noise
  • the OFDM system only supports the first type hybrid automatic request retransmission Type l HARQ, determining the corresponding retransmission queue length according to the type of impulse noise in the noise information; or The length of the corresponding retransmission queue is determined according to the length and interval of the impulse noise in the noise information.
  • the received noise type detection result is Gaussian noise
  • the OFDM system only supports the first type hybrid automatic request retransmission Type I HARQ
  • the bits of each data transmission unit subcarrier are determined according to the noise variation in the noise information.
  • the load value can be specifically determined whether the noise change is increased. If the noise is increased, it is judged whether the increase amplitude exceeds the threshold.
  • the threshold value may be determined in advance according to a specific network environment or service requirement or other conditions, or dynamically adjusted by the network management system or automatically updated according to certain predetermined conditions. For example, the threshold may be taken as 6 db. If the noise increase amplitude is within the threshold of 6 db, the threshold may be When the amplitude of the noise change is increased by 3 db, the bit load value of each data transmission unit subcarrier is reduced by one unit, such as 2 bits.
  • 6bd, 3db, and 2bit are just an example, and other values may be taken according to specific conditions, and the present invention is not limited.
  • the transmitter 630 is configured to send the data transmission unit according to the determined parameter.
  • the transmitter 630 performs data transmission according to the determined specific transmission parameter, specifically, retransmits the requested retransmission data according to the determined retransmission type; retransmits the data and the common data according to the determined bit loading value (system The normally transmitted data, that is, the non-retransmitted data, is transmitted; the retransmitted data is retransmitted according to the determined retransmission queue length.
  • the apparatus for resisting noise in an OFDM system provided by the embodiment of the present invention achieves resistance to noise in an OFDM system by detecting a type of noise and related information, and then updating corresponding transmission parameters.
  • the sixth embodiment of the present invention provides a device for resisting noise in an OFDM system, and the structure of the device can be referred to FIG.
  • the apparatus for resisting noise in an OFDM system includes: a processor, a transmitter, and a receiver; wherein
  • the processor is configured to detect the noise information of the noise causing the data transmission unit to transmit an error; the function that can be performed by the specific processor can be referred to step S120 of the first embodiment.
  • a transmitter configured to send retransmission request information and a noise information detection result detected by the processor.
  • the function implementation of the transmitter for sending the retransmission request information may refer to the first implementation. Step S140 of the example.
  • the retransmission request information includes different information because the manner of retransmitting the request is different.
  • the method for retransmitting the request may be multiple.
  • One is to confirm the status of multiple data transmission units at one time, and indirectly request the data transmission unit that needs to be retransmitted, and then at least some recent data transmission needs to be included in the retransmission request information.
  • the unit is correctly transmitted status ACK or NAK message, wherein the ACK message is correctly received by the acknowledgment data transmission unit fed back to the transmitting end by the receiving end, and the NAK message is not correctly received on behalf of the data transmission unit fed back to the transmitting end by the receiving end.
  • the apparatus for resisting noise in an OFDM system provided by the embodiment of the present invention achieves resistance to noise in an OFDM system by detecting a type of noise and related information, and then updating corresponding transmission parameters.
  • the seventh embodiment of the present invention provides an OFDM system, which can implement the method in the fourth embodiment by using the apparatus in the fifth and sixth embodiments.
  • the above OFDM system includes: a receiving device and a transmitting device.
  • the receiving device may specifically be the device in the sixth embodiment; the transmitting device may be the device described in the fifth embodiment.
  • An eighth embodiment of the present invention further provides an apparatus, which may further include a receiver, a transmitter, and a processor, where
  • a processor configured to detect the noise information of the noise causing the data transmission unit to transmit an error; and determine the transmission parameter according to the noise information detection result received by the receiver that causes the data transmission unit to transmit the error noise.
  • the function of the block; the implementation of determining the parameter function is also the same, and the function of determining the module may be determined by referring to the determining step of the sending parameter or the corresponding parameter in the above embodiment.
  • a transmitter configured to send retransmission request information and a noise information detection result of the noise detected by the processor that causes the data transmission unit to transmit an error; the number of transmission parameters determined according to the processor According to the transmission unit.
  • the receiver is configured to receive retransmission request information and a noise information detection result from the peer end.
  • the apparatus described in this embodiment is equivalent to the function of the transmitting end and the receiving end of the apparatus in the system as both the transmitting end and the receiving end. It will be readily understood by those skilled in the art that in a symmetric system, the transmitting end and the receiving end are concepts of peering, and for the product or the device itself, it bears the transmitting end and the receiving end respectively in the uplink and downlink data transmission process. The role, therefore both the sender and receiver functions. The same is true for the next embodiment.
  • the device disclosed in this embodiment detects the received data when it is the receiving end, determines that the retransmission needs to be performed, detects the noise condition, and sends the noise detection result and the retransmission request to the opposite end; At the end, according to the received retransmission request and the noise detection result sent by the opposite end, the corresponding transmission parameter is determined, and the data is sent to the opposite end according to the determined transmission parameter.
  • the ninth embodiment of the present invention further provides a device, which may further include a receiver, a transmitter and a processor, wherein
  • a processor configured to detect noise information that causes noise of the data transmission unit to transmit errors, obtain a noise information detection result of the noise, and determine a transmission parameter according to the noise information detection result; and send according to the transmission parameter received by the receiver Data transmission unit
  • a transmitter configured to send, by the processor, a sending parameter and a retransmission request information
  • the receiver is configured to receive the sending parameter and the retransmission request information sent by the peer end.
  • the functions of the respective unit modules in this embodiment can refer to the execution or implementation of the corresponding functions in the above embodiments.
  • the device described in this embodiment also has the roles of the transmitting end and the receiving end.
  • the performing function is: performing noise information detection on the local end and determining a sending parameter according to the detection result, and sending the sending parameter and the retransmission request.
  • the transmitting end receives the data sent by the opposite end; when it is the transmitting end, its execution function: according to the sending parameter sent by the opposite end, the data is sent according to the received sending parameter.
  • a tenth embodiment of the present invention discloses an OFDM system, which includes a transmitting device and a connection The receiving device, wherein the transmitting device and the receiving device are both devices as described in the eighth embodiment; or the transmitting device and the receiving device are both devices as described in the ninth embodiment.
  • the method, device and system for resisting noise in an OFDM system provided by the embodiments of the present invention detect a type of noise and related information, and then update corresponding transmission parameters, such as adopting a corresponding retransmission type, a reduced bit loading value or The updated retransmission queue length, etc., achieves resistance to noise in the system.
  • the data referred to in the present invention is an abstract concept, which refers to information transmitted in the system, and specifically, can be transmitted in the form of a data transmission unit.

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Abstract

本发明实施例公开了抵抗OFDM系统中噪声的方法,包括:接收重传请求信息和引起数据传输单元错误的噪声的噪声信息检测结果;根据所述重传请求信息和噪声信息检测结果对发送参数进行更新;根据更新后的发送参数发送数据传输单元;检测引起数据传输单元错误的噪声的噪声信息,根据该噪声信息确定发送参数,将该发送参数和重传信息发送出去供对端根据该发送参数进行数据传输。此外,本发明实施例还公开了相应的抵抗OFDM系统中噪声的装置和系统。

Description

抵抗 OFDM系统中噪声的方法、 装置和 OFDM系统 技术领域
本发明涉及通信领域, 特别地涉及抵抗 OFDM ( Orthogonal Frequency Division Multiplexing, 正交频分复用) 系统中噪声的方法、 装置和 OFDM 系统。 背景技术
OFDM系统是通信系统中应用非常广泛的系统, OFDM系统主要的工作 原理是, 将信道分成若干正交子信道, 将高速数据信号转换成并行的低速 子数据流, 调制到在每个子信道上进行传输。 正交信号可以通过在接收端 采用相关技术来分开, 这样可以减少子信道之间的相互干扰。 每个子信道 上的信号带宽小于信道的相关带宽, 因此每个子信道上的可以看成平坦性 衰落, 从而可以消除符号间干扰。 而且由于每个子信道的带宽仅仅是原信 道带宽的一小部分, 信道均衡变得相对容易。
现有技术中, OFDM 系统线路环境的变化, 其中特别是噪声的变化, 会引起系统的不稳定, 给 OFDM系统的正常通信造成干扰, 导致通信质量 下降。 现有技术中, 通常采用配置噪声容限 Noise Margin 的方式来对抗 OFDM 系统中出现的一些噪声。 配置噪声容限, 虽然能够保持系统的稳定 性, 但同时会引起系统速率的降低, 进而导致系统性能降低。
发明内容
本发明实施例提供了抵抗 OFDM系统中噪声的方法、装置和 OFDM系 统, 能够在有效抵抗系统噪声的同时, 保证系统数据传输的速率, 进而确 保 OFDM系统的性能。
本发明实施例提供的一种抵抗 OFDM系统中噪声的方法, 包括: 接收 重传请求信息和引起数据传输错误的噪声的噪声信息检测结果; 根据所述 重传请求信息和噪声信息检测结果对发送参数进行更新; 根据更新后的发 送参数发送数据传输单元。
本发明实施例提供的另一种抵抗正交频分复用 OFDM系统中噪声的方 法, 包括: 对引起数据传输单元传输错误的噪声的噪声信息进行检测; 发 送重传请求信息和所述噪声的噪声信息检测结果; 接收按照更新后的发送 参数发送来的数据传输单元。
本发明实施例提供的一种抵抗正交频分复用 OFDM 系统中噪声的装 置, 包括: 接收器, 处理器和发送器, 其中, 所述接收器, 用于接收重传 请求信息和引起数据传输单元传输错误的噪声的噪声信息检测结果; 所述 处理器, 用于根据接收器接收的所述噪声信息检测结果确定发送参数; 所 述发送器, 用于根据处理器确定的发送参数发送数据传输单元。
本发明实施例提供的另一种抵抗正交频分复用 OFDM系统中噪声的装 置, 包括: 接收器, 处理器和发送器, 其中, 所述处理器, 用于对引起数 据传输单元传输错误的噪声的噪声信息进行检测; 所述发送器, 用于发送 重传请求信息和所述处理器检测出的噪声信息检测结果; 所述接收器, 用 于接收按照更新后的发送参数发送来的数据传输单元。
本发明实施例提供的第三种抵抗正交频分复用 OFDM系统中噪声的方 法, 包括: 对引起数据传输单元传输错误的噪声进行检测, 获得引起数据 传输单元传输错误的噪声的噪声信息检测结果; 根据所述噪声的噪声信息 检测结果, 确定发送参数; 发送重传请求信息和所述确定的发送参数; 接 收按照所述确定的发送参数发送的数据传输单元。
本发明实施例提供的第三种抵抗正交频分复用 OFDM系统中噪声的装 置, 包括: 接收器, 处理器和发送器, 其中, 所述处理器, 用于对引起数 据传输单元传输错误的噪声进行检测, 获得引起数据传输单元传输错误的 噪声的噪声信息检测结果; 并根据该噪声信息检测结果确定发送参数; 所 述发送器, 用于发送错误数据传输单元的重传请求信息和所述处理器确定 的发送参数; 所述接收器, 用于接收按照所确定的发送参数发送来的数据 传输单元。
本发明实施例提供的第四种抵抗正交频分复用 OFDM系统中噪声的装 置, 包括: 接收器, 处理器和发送器, 其中, 所述处理器, 用于对引起数 据传输单元传输错误的噪声的噪声信息进行检测; 根据接收器接收到的引 起数据传输单元传输错误的噪声的噪声信息检测结果, 确定发送参数; 所 述发送器, 用于发送重传请求信息和处理器检测出的引起数据传输单元传 输错误的噪声的噪声信息检测结果; 根据处理器确定的发送参数发送数据 传输单元; 所述接收器, 用于接收来自对端的重传请求信息和噪声信息检 测结果。
本发明实施例提供的第五种抵抗正交频分复用 OFDM系统中噪声的装 置, 包括: 接收器, 处理器和发送器, 其中, 所述处理器, 用于对引起数 据传输单元传输错误的噪声的噪声信息进行检测, 获得所述噪声的噪声信 息检测结果, 并根据该噪声信息检测结果确定发送参数; 根据接收器接收 到的发送参数发送数据传输单元; 所述发送器, 用于发送处理器确定的发 送参数和重传请求信息; 所述接收器, 用于接收对端发送的发送参数和重 传请求信息。
本发明实施例提供的一种正交频分复用 OFDM系统, 包括相互连接的 接收装置和发送装置, 其中, 所述接收装置为上述本发明实施例提供的第 二种装置, 所述发送装置为上述本发明实施例提供的第一种装置; 或者所 述接收装置为上述本发明实施例提供的第三种装置, 所述发送装置用于接 收所述接收装置发送来的错误数据传输单元的重传请求信息及发送参数, 按照所述接收到的发送参数向所述接收端发送数据传输单元; 或者所述接 收装置为上述本发明实施例提供的第四种装置, 所述发送装置为上述本发 明实施例提供的第四种装置; 或者所述接收装置为上述本发明实施例提供 的第五种装置, 所述发送装置为上述本发明实施例提供的第五种装置。
上述本发明实施例提供的抵抗 OFDM 系统中噪声的方法、 装置和 OFDM 系统, 通过检测引起数据传输单元错误的不同的噪声的信息, 进而 针对不同的噪声情况采取如确定重传类型为相应的 HARQ类型, 降低比特 加载值等方法进行对抗, 在实现了抵抗信道噪声的同时又确保了 OFDM系 统数据传输的速率。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案, 下面将对 实施例或现有技术描述中所需要的附图作筒单介绍, 很明显, 下面描述中 的附图仅仅是现有技术的说明及本发明的一些实施例, 对于本领域的普通 技术人员来说, 在不付出创造性劳动的前提下,还可以根据这些附图获得其 他附图。
图 1所示为本发明实施例提供的抵抗 OFDM系统中噪声的方法流程图; 图 2所示为本发明实施例提供的 OFDM系统中一种数据帧的结构示意 图;
图 3所示为本发明实施例提供的抵抗 OFDM系统中噪声装置的结构示 意图;
图 4所示为本发明实施例提供的一种 OFDM系统;
图 5所示为本发明实施例提供的另一种抵抗 OFDM系统中噪声的方法 流程图;
图 6所示为本发明实施例提供的另一种抵抗 OFDM系统中噪声的装置 示意图。 具体实施方式:
本发明实施例提供的抵抗 OFDM系统中噪声的方法、装置和 OFDM系 统, 能够在有效抵抗噪声的同时, 保证系统数据传输速率进而确保 OFDM 系统的性能。 本发明实施例提供的抵抗 OFDM系统中噪声的方法、装置和 OFDM系 统, 针对引起数据传输单元错误的不同类型的噪声相应地采用不同类型的 混合自动请求重传 ( Hybrid Automatic Repeat reQuest, HARQ )抵抗系统中 的噪声; 或者在系统只支持一种 HARQ的情况下, 即只支持第一类型混合 自动请求重传 Type l HARQ时, 根据具体的噪声情况, 采取不同的重传队 列长度或降低比特加载值等方法降低噪声对系统性能的影响。 进一步说, OFDM系统中的噪声主要分为两种: 脉沖噪声和高斯噪声 /类高斯噪声, 这 里为了便于说明将 "高斯噪声或类高斯噪声" 统一称为 "高斯噪声"。
本发明实施例提供的抵抗 OFDM系统中噪声的方法、 装置和系统, 在 系统支持第一类型混合自动请求重传 Type I HARQ, 并且支持第二类型混 合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Type IIIIR-HARQ或第三类型追赶合并混合自动请求重传 TypelllCC-HARQ中的 任一种或多种时, 采用第一类型 Type I HARQ对脉沖噪声进行对抗; 采用 第二类型 Type II HARQ、 第三类型增量冗余混合自动请求重传模式 ( Incremental Redundancy Hybrid Automatic Repeat request, IR-HARQ ) Type IIIIR-HARQ 和第三类型追赶合并混合自动请求重传模式 (Chase Combine Hybrid Automatic Repeat request, IR-HARQ) Type III CC-HARQ中的任意一种 对高斯噪声进行对抗。
本发明实施例提供的抵抗 OFDM系统中噪声的方法、 装置和系统, 在 系统只支持第一类型混合自动请求重传 Type I HARQ时, 根据脉沖噪声的 不同类型确定对应的不同重传队列长度, 以此抵抗脉沖噪声的影响; 根据 高斯噪声的变化情况, 相应的降低每个数据传输单元子载波的比特加载值, 以此抵抗高斯噪声。
具体来说, 本发明第一实施例提供了一种抵抗 OFDM系统中噪声的方 法, 如图 1所示, 包含:
步骤 S110, 对数据传输单元进行检错; 接收端通过前向纠错编码( Forward Error Correction, FEC )对数据传输 单元进行检错纠错或通过循环冗余校验 CRC对数据传输单元进行检错, 如 果没有错误, 则向发送端发送 ACK消息, ACK消息代表接收端反馈给发 送端的确认数据传输单元被正确接收, 如果有错误, 则执行步骤 S120。 步骤 S120, 对引起数据传输单元传输错误的噪声进行检测;
接收端对引起数据传输单元传输错误的噪声类型进行检测, 以判断引 起数据传输单元错误的噪声是脉沖噪声还是高斯噪声。
具体而言, 接收端对所述引起数据传输单元错误的噪声类型检测可以 通过如下方法实施:
接收端可以统计引起数据传输单元错误的噪声的分布情况(例如通过 统计 Slicer Error/Viterbi Error的分布情况 )来判断是哪种噪声引起的数据传 输单元错误, 如果噪声分布满足高斯分布, 那么就是高斯噪声引起的数据 传输单元错误; 如果不满足高斯分布, 那么就是脉沖噪声引起的数据传输 单元错误;
接收端还可以检测数据传输单元分组被破坏的程度来确定是哪种噪声 引起的数据传输单元错误。 这种检测噪声类型的方法需要定义一种新的数 据帧格式, 数据帧格式中增加一个字段信息 (长度为一个字节或多个字节 不等)用于指示数据帧的质量状态, 发送端将某些特定的序列(比如重复 1 比特或 2比特序列等)调制在一个符号中具有高信噪比的部分 tone上, 每 个 tone进行低阶调制, 使得这些 tone具有很高的抗噪声能力, 接收端检测 所述字段是否被破坏, 如果该字段都被破坏了, 说明这个数据传输单元被 严重破坏了, 则判断为是脉沖噪声引起的数据传输单元错误, 如果该字段 没有被破坏, 说明这个数据传输单元只是被轻度破坏, 则判断为高斯噪声 引起的数据传输单元错误。
上述根据检测数据传输单元被破坏的程度进而判断是何种噪声引起的 数据传输单元错误来确定 HARQ 的重传类型的具体做法参见图 2 , 在 G.998.4规定的数据帧中插入一个字段 Qflag210, Qflag字段 210可以位于 数据帧的 RRC ( Retransmission Return Channel, 重传返回通道 )之前, Qflag 字段 210也可以位于 RRC之后, Qflag字段 210用于指示数据帧的质量状 态,在通信阶段检测 Qflag字段 210是否被破坏来判断数据传输单元被破坏 的程度进而判断引起数据传输单元错误的噪声类型,若 Qflag字段 210被破 坏, 则判断为引起数据传输单元错误的噪声类型为脉沖噪声, 若 Qflag字段 210没有被破坏, 则判断为引起数据传输单元错误的噪声类型为高斯噪声。
在确定具体噪声类型后, 接收端可以进一步检测, 具体的,
如果噪声类型为脉沖噪声, 检测脉沖噪声的长度和间隔; 或者在检测 获得脉沖噪声的长度和间隔后, 进一步根据该脉沖噪声的长度和间隔确定 该脉沖噪声的类型;
如果噪声类型为高斯噪声, 检测该高斯噪声相对于稳定状态时的变化 情况。 具体的该高斯噪声相对于稳定状态时的变化情况可以包括变化方向, 如噪声增大或减小, 以及变化幅值, 如变化 3db, 6db等。 步骤 S130, 根据上述噪声类型检测的检测结果确定发送参数; 如果步骤 120中的噪声类型检测结果是脉沖噪声, 且本 OFDM系统支 持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动请 求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Type lll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定发送参数里的重传类型为 Type I HARQ以对抗脉沖对 抗。 Type I HARQ类型是最筒单的 HARQ处理方式, 接收端通知发送端进 行重传, 发送端收到某个数据传输单元的重传请求信息之后, 启动对该数 据传输单元的重传, 重传的内容与原始数据传输单元完全相同, 即重传的 数据传输单元只是筒单的复制了原始数据, 接收端将收到错误的数据传输 单元进行丢弃处理, 因此每次重传数据包被正确解码的概率与原始数据相 同;
如果步骤 120中的噪声类型检测结果是高斯噪声, 且所述 OFDM系统 支持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动 请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定重传类型为 Type II HARQ、 Type III IR-HARQ或 Type ΠΙ CC-HARQ中的任一种作为抵抗噪声的方式。 其中, Type ll HARQ, 即每 次重传只传输追加的冗余信息, 重传数据传输单元中不包含系统信息字节 / 比特, 因此接收端需要将重传的冗余信息和初始的冗余信息进行联合, 形 成纠错能力更强的 FEC码字, 比如第一次发送选择的是冗余版本 0, 第二 次发送选择的是冗余版本 1 , 然后两次的冗余进行联合, 形成具有更多冗余 的 FEC码字, 纠错能力更强, 使得能够纠正由于高斯噪声或类高斯噪声引 起的比特错误; Type III IR-HARQ, 即每次重传除了传输追加的冗余信息, 还会重传所有系统信息字节 /比特, 重传数据传输单元因为包含所有系统信 息字节 /比特, 以及部分追加的冗余信息, 因此具有自解码能力, 接收端首 先对重传分组进行解码, 如果解码不成功, 则将多次传输的数据传输单元 进行合并, 再进行解码, 如果仍然不能正确解码, 则继续传输后续重传数 据传输单元。 这种方法由于每次都会对系统信息字节 /比特进行优化选择, 因此合并增益会更大, 解码成功的概率越高, 越有利于对抗高斯噪声等引 起的随机错误; 其中, Type III CC-HARQ , 这种模式的 HARQ只有一种冗 余版本, 要么是全部冗余, 要么是其中一种冗余版本, 推荐采用全部冗余, 即每次重传具有相同冗余版本的数据传输单元, 接收端则将每次收到的数 据传输单元与之前收到的所有数据传输单元根据各次接收时信道的信噪比
( SNR ) 获得一个权重因子, 或计算最大似然比等方法进行软合并, 组合 成一个具有更强纠错能力的 FEC码字, 该模式实现起来非常筒单, 且合并 增益高。
如果步骤 120中的噪声类型检测结果是脉沖噪声, 且所述 OFDM系统 只支持第一类型混合自动请求重传 Type l HARQ, 则根据噪声信息中的脉 沖噪声的类型确定对应的重传队列长度; 或者根据噪声信息中的脉沖噪声 的长度和间隔确定对应的重传队列长度。
具体到脉沖噪声类型一般包括: ( 1 ) REIN ( Repetitive Electrical Impulse Noise )是以 100Hz或 120Hz的频率重复的周期性脉沖噪声。 它是 电力网耦合入双绞线中脉沖噪声。 REIN持续的长度大约 1DMT ~ 3DMT符 号。 (2 ) PEIN ( Prolonged Electrical Impulse noise )是非周期的脉沖噪声, 其持续的时间范围是 1ms ~ 10ms。 (3) SHINE ( Single High Impulse Noise Environment )是随机的超长的脉沖噪声。单个脉沖噪声持续时间超过 10ms, 其主要来源有雷电、 汽车启动等。
例如噪声长度是 lms , 间隔为 2ms—次, 那么就要求队列长度必须能满 足 lms的数据重传, 而且要求重传延时应该在 2ms之内。 现有技术能实现 根据噪声信息中的脉沖噪声的类型确定对应的重传队列长度, 或者根据噪 声信息中的脉沖噪声的长度和间隔确定对应的重传队列长度。
如果步骤 120中的噪声类型检测结果是高斯噪声, 且所述 OFDM系统 只支持第一类型混合自动请求重传 Type l HARQ, 则根据噪声信息中的噪 声变化情况确定每个数据传输单元子载波的比特加载值, 具体的可以判断 噪声变化是否为增大, 如为噪声增大, 判断增大幅值是否超过阈值,如未超 过阈值,则降低每个数据传输单元子载波的比特加载值。 阈值可以根据具体 网络环境或者业务需求或者其他条件预先确定, 或者由网管动态调整或者 根据一定的预定条件自动更新, 例如可以取阈值为 6db, 如果噪声增大幅值 在这个 6db的阈值内, 可以在噪声变化幅值每增大 3db时, 降低每个数据 传输单元子载波的比特加载值一个单位, 如 2bit。 当然这里的 6bd, 3db, 2bit都只是一个例子, 可以根据具体情况取其他值, 本发明不做限制。 步骤 S140, 发送重传请求信息。
向发送端发送上述错误数据传输单元的重传请求信息, 以及接收端确 定出的、 为抵抗上述检测出的导致数据传输单元错误的噪声所确定的发送 参数, 发送端接收到接收端发送来的重传请求信息和发送参数后, 进行解 析, 准备好相应的重传过程, 采用接收端指定的发送参数进行数据传送。
其中, 重传请求的方式可以有多种, 一种可以是一次确认多个数据传 输单元的状态, 间接请求需要重传的数据传输单元, 那么上述重传请求信 息中至少需要包括: 最近一些数据传输单元是否被正确传输的状态 ACK或 NAK信息, 其中 ACK代表接收端反馈给发送端的确认数据传输单元被正 确接收, NAK代表接收端反馈给发送端的数据传输单元未被正确接收; 另 一种可以是直接请求需要重传的数据传输单元, 那么这种情况下上述重传 请求信息中至少需要包含: 需要重传的数据传输单元的序列号。
发送参数可以跟重传请求一起发送, 调制在同一个符号中发送出去, 例如在一个符号中, 利用一些 tone调制重传请求信息, 利用另一些 tone调 制发送参数信息。 发送参数也可以单独用一个符号发送出去, 这里不限制。
如果系统支持两种以上 HARQ类型, 则接收端可以用两比特信息表示 HARQ 的类型, 例如, 其中的一种情况可以是用 "00" 表示所述 Type l HARQ, "01" 表示所述 Type II HARQ, "10" 表示所述 TypeIIIIR-HARQ, "11" 表示所述 TypelllCC-HARQ, 这只是用两比特信息表示 HARQ类型 的一种情况, 具体应用中, 可以不限于这种情形, 还有其他多种方式。 如 果系统只支持两种 HARQ类型, 则接收端可以只用 1比特信息表示 HARQ 类型。
步骤 S150, 接收按照上述确定的发送参数发送的数据传输单元。
发送端会根据接收端在步骤 S140中发送来的错误数据传输单元的重传 请求信息, 按照接收到的相应的发送类型进行数据传送, 接收端对按照相 应发送参数进行重传的错误数据传输单元进行接收。
本发明实施例提供的抵抗 OFDM系统中噪声的方法, 通过检测引起数 据传输单元错误的噪声信息, 进而针对不同的噪声类型采用相应的对抗措 施, 如采用相应的重传类型, 降低的比特加载值或者更新后的重传队列长 度等,在实现了抵抗信道噪声的同时又确保了 OFDM系统数据传输的速率。
基于上述实施例中提供的抵抗 OFDM系统中噪声的方法, 本发明第二 实施例提供了一种抵抗 OFDM系统中噪声的装置, 该装置可以执行上述第 一实施例中的方法, 实现抵抗噪声的效果。
参考图 3所示, 本实施例提供的抵抗 OFDM系统中噪声的装置 300包 括: 处理器 310, 发送器 320和接收器 330; 其中, 处理器 310可以包括检 测模块 3101和发送参数确定模块 3102。
处理器 310用于对引起数据传输单元传输错误的噪声进行检测, 获得 引起数据传输单元传输错误的噪声的噪声信息检测结果; 并根据该噪声信 息检测结果确定发送参数。 具体的,
检测模块 3101 , 用于对引起数据传输单元错误的噪声类型进行检测; 由于接收端接收到的数据传输单元中包含的错误超过了 FEC纠错能力, 因此经过 FEC之后, FEC的检错功能或循环冗余校验( CRC )发现数据传输 单元错误, 接收端中的检测模块 31 01会启动对引起数据传输单元错误的噪 声类型进行检测, 以判断引起数据传输单元错误的噪声是脉沖噪声还是高 斯噪声。 具体而言, 检测模块 3101可以统计引起数据传输单元错误的噪声 的分布情况(例如通过统计 Slicer Error/Viterbi Error的分布情况 )来判断是 哪种噪声引起的数据传输单元错误, 如果噪声分布满足高斯分布, 那么就 是高斯噪声引起的数据传输单元错误; 如果不满足高斯分布, 那么就是脉 沖噪声引起的数据传输单元错误;
检测模块 3101还可以检测数据传输单元分组被破坏的程度来确定是哪 种噪声引起的数据传输单元错误, 进而确定 HARQ的重传类型, 这种检测 噪声类型的方法需要定义一种新的数据帧格式, 数据帧格式中增加一个字 段信息 (长度为一个字节或多个字节不等)用于指示数据帧的质量状态, 发送端将某些特定的序列 (比如重复 1 比特或 2比特序列等)调制在一个 符号中具有高信噪比的部分 tone上,每个 tone进行低阶调制,使得这些 tone 具有很高的抗噪声能力, 接收端检测所述字段是否被破坏, 如果该字段都 被破坏了, 说明这个数据传输单元被严重破坏了, 则判断为是脉沖噪声引 起的数据传输单元错误, 如果该字段没有被破坏, 说明这个数据传输单元 只是被轻度破坏, 则判断为高斯噪声引起的数据传输单元错误。
上述根据检测数据传输单元被破坏的程度进而判断是何种噪声引起的 数据传输单元错误来确定 HARQ的重传类型的具体做法参见图 2, 具体实 现请参见第一实施例对图 2的相应描述, 此处不再赘述。
在确定具体噪声类型后, 接收端可以进一步进行检测, 例如, 如果噪 声类型为脉沖噪声, 检测脉沖噪声的长度和间隔; 或者在检测获得脉沖噪 声的长度和间隔后, 进一步根据该脉沖噪声的长度和间隔确定该脉沖噪声 的类型; 如果噪声类型为高斯噪声, 检测该高斯噪声相对于稳定状态时的 变化情况。 具体的该高斯噪声相对于稳定状态时的变化情况可以包括变化 方向, 如噪声增大或减小, 以及变化幅值, 如变化 3db, 6db等。
发送参数确定模块 3102, 用于根据检测模块对噪声信息的检测结果确 定发送参数。
如果检测模块检测出的噪声类型检测结果是脉沖噪声, 且本 OFDM系统支 持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动请 求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Type lll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定发送参数里的重传类型为 Type I HARQ以对抗脉沖对 抗。 Type I HARQ类型是最筒单的 HARQ处理方式, 接收端通知发送端进 行重传, 发送端收到某个数据传输单元的重传请求信息之后, 启动对该数 据传输单元的重传, 重传的内容与原始数据传输单元完全相同, 即重传的 数据传输单元只是筒单的复制了原始数据, 接收端将收到错误的数据传输 单元进行丢弃处理, 因此每次重传数据包被正确解码的概率与原始数据相 同;
如果检测模块检测出的噪声类型检测结果是高斯噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合 自动请求重传 Type II HARQ, 第三类型增量冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定重传类型为 Type II HARQ、 Type III IR-HARQ或 Type ΠΙ CC-HARQ中的任一种作为抵抗噪声的方式。 其中, Type ll HARQ, 即每 次重传只传输追加的冗余信息, 重传数据传输单元中不包含系统信息字节 / 比特, 因此接收端需要将重传的冗余信息和初始的冗余信息进行联合, 形 成纠错能力更强的 FEC码字, 比如第一次发送选择的是冗余版本 0, 第二 次发送选择的是冗余版本 1 , 然后两次的冗余进行联合, 形成具有更多冗余 的 FEC码字, 纠错能力更强, 使得能够纠正由于高斯噪声或类高斯噪声引 起的比特错误; Type III IR-HARQ, 即每次重传除了传输追加的冗余信息, 还会重传所有系统信息字节 /比特, 重传数据传输单元因为包含所有系统信 息字节 /比特, 以及部分追加的冗余信息, 因此具有自解码能力, 接收端首 先对重传分组进行解码, 如果解码不成功, 则将多次传输的数据传输单元 进行合并, 再进行解码, 如果仍然不能正确解码, 则继续传输后续重传数 据传输单元。 这种方法由于每次都会对系统信息字节 /比特进行优化选择, 因此合并增益会更大, 解码成功的概率越高, 越有利于对抗高斯噪声等引 起的随机错误; 其中, Type III CC-HARQ , 这种模式的 HARQ只有一种冗 余版本, 要么是全部冗余, 要么是其中一种冗余版本, 推荐采用全部冗余, 即每次重传具有相同冗余版本的数据传输单元, 接收端则将每次收到的数 据传输单元与之前收到的所有数据传输单元根据各次接收时信道的信噪比 ( SNR ) 获得一个权重因子, 或计算最大似然比等方法进行软合并, 组合 成一个具有更强纠错能力的 FEC码字, 该模式实现起来非常筒单, 且合并 增益高。
如果检测模块检测出的噪声类型检测结果是脉沖噪声, 且所述 OFDM 系统只支持第一类型混合自动请求重传 Type l HARQ, 则根据噪声信息中 的脉沖噪声的类型确定对应的重传队列长度; 或者根据噪声信息中的脉沖 噪声的长度和间隔确定对应的重传队列长度。
如果检测模块检测出的噪声类型检测结果是高斯噪声, 且所述 OFDM 系统只支持第一类型混合自动请求重传 Type l HARQ, 则根据噪声信息中 的噪声变化情况确定每个数据传输单元子载波的比特加载值, 具体的可以 判断噪声变化是否为增大, 如为噪声增大, 判断增大幅值是否超过阈值,如 未超过阈值,则降低每个数据传输单元子载波的比特加载值。 阈值可以根据 具体网络环境或者业务需求或者其他条件预先确定, 或者由网管动态调整 或者根据一定的预定条件自动更新, 例如可以取阈值为 6db, 如果噪声增大 幅值在这个 6db的阈值内, 可以在噪声变化幅值每增大 3db时, 降低每个 数据传输单元子载波的比特加载值一个单位,如 2bit。当然这里的 6bd, 3db, 2bit都只是一个例子, 可以根据具体情况取其他值, 本发明不做限制。 发送器 320, 用于发送错误数据传输单元的重传请求信息及处理器 310 确定的发送参数。
其中, 重传请求信息由于重传请求的方式不同, 会包括不同的信息。 具体来说, 重传请求的方式可以有多种, 一种是一次确认多个数据传 输单元的状态, 间接请求需要重传的数据传输单元, 那么重传请求信息中 至少需要包括最近一些数据传输单元是否被正确传输的状态 ACK或 NAK 消息,其中 ACK消息代表接收端反馈给发送端的确认数据传输单元被正确 接收, NAK消息代表接收端反馈给发送端的数据传输单元未被正确接收。 发送参数可以跟重传请求一起发送, 调制在同一个符号中发送出去, 例如 在一个符号中, 利用一些 tone调制重传请求信息, 利用另一些 tone调制发 送参数信息。 发送参数也可以单独用一个符号发送出去, 这里不限制。
如果系统支持两种以上 HARQ类型, 则发送模块 310还用于用两比特 信息表示 HARQ的类型, 例如, 其中的一种情况可以是用 "00" 表示所述 Type I HARQ , "01 " 表示所述 Type II HARQ , " 10" 表示所述 Type lll IR-HARQ, " 11 " 表示所述 Type ΠΙ CC-HARQ, 这只是用两比特信息表示 HARQ类型的一种情况, 具体应用中, 可以不限于这种情形, 还有其他多 种方式。 如果系统只支持两种 HARQ类型, 则接收端可以只用 1比特信息 表示 HARQ类型。
接收器 330, 用于接收按照所述发送参数发送数据传输单元。
发送端会根据发送器 320发送来的错误数据传输单元的重传请求信息, 按照相应的发送参数发送数据传输单元, 接收器 330接收该数据传输单元。
发送端会根据收到的具体发送参数进行数据发送, 具体的, 按照接收 到的重传类型, 对请求的重传数据进行重传; 按照接收到的比特加载值对 重传数据以及普通数据 (系统正常发送的数据, 即非重传数据)进行发送; 按照接收到的重传队列长度, 对重传数据进行重传。
本发明实施例提供的抵抗 OFDM系统中噪声的装置, 通过确定引起数 据传输单元错误的不同的噪声信息, 进而针对不同的噪声类型采用相应的 对抗措施, 如采用相应的重传类型, 降低的比特加载值或者更新后的重传 队列长度等, 进而针对不同的噪声类型采用相应的 HARQ类型进行对抗, 在实现了抵抗噪声的同时又确保了 OFDM系统数据传输的速率。
基于上述实施例提供的抵抗 OFDM系统中噪声的方法和装置, 本发明 第三实施例提供了一种 OFDM系统。
参考图 4所示, 本实施例提供的 OFDM系统包括: 接收端 410和发送 端 420; 接收端 410, 用于对引起数据传输单元错误的噪声信息进行检测, 获得 引起数据传输单元传输错误的噪声的噪声信息检测结果; 并根据该噪声信 息检测结果确定发送参数; 向发送端 420发送该确定的发送参数和重传请 求。
本系统的接收端 410可以采用如第二实施例中描述的装置。
发送端 420,用于接收接收端 410发送来的错误数据传输单元的重传请 求信息及发送参数, 按照该接收到的发送参数向接收端 410发送数据传输 单元。 发送端 420根据收到的具体发送参数进行数据发送, 具体的, 可按 照接收到的重传类型, 对请求的重传数据进行重传; 或按照接收到的比特 加载值对重传数据以及普通数据(系统正常发送的数据, 即非重传数据) 进行发送; 或按照接收到的重传队列长度, 对重传数据进行重传。
本发明实施例提供的 OFDM系统, 通过确定引起数据传输单元错误的 不同的噪声信息, 进而针对不同的噪声类型采用相应的对抗措施, 如采用 相应的重传类型, 降低的比特加载值或者更新后的重传队列长度等, 在实 现了抵抗信道噪声的同时又确保了 OFDM系统数据传输的速率。 对应的,本发明实施例还提供了另一种抵抗 OFDM系统中噪声的方法、 装置和另一种 OFDM系统。
本发明实施例提供的另一种抵抗 OFDM系统中噪声的方法、 装置和另 一种 OFDM系统中, 接收端对引起数据传输单元传输错误的噪声的噪声信 息进行检测, 将该引起数据传输单元传输错误的噪声的噪声信息检测结果 和重传请求发送给发送端; 发送端根据收到的引起数据传输单元传输错误 的噪声的噪声信息检测结果, 确定发送参数, 并根据该确定的发送参数进 行数据的发送。
具体来说, 本发明第四实施例提供抵抗 OFDM系统中噪声的方法, 参 考图 5所示: 步骤 S510, 接收重传请求信息和引起数据传输单元传输错误的噪声的 噪声信息检测结果;
这里的重传请求信息中至少包括最近一些数据传输单元是否被正确传 输的状态 ACK或 NAK信息,其中 ACK代表接收端反馈给发送端的确认数 据传输单元被正确接收, NAK代表接收端反馈给发送端的数据传输单元未 被正确接收; 或者这里的重传请求信息至少包括: 需要重传的数据传输单 元的序列号。
引起数据传输单元传输错误的噪声的噪声信息检测结果包括噪声的类 型, 或者包括噪声类型以及高斯噪声变化情况, 脉沖噪声类型或者脉沖噪 声的长度和间隔等信息。
步骤 S520, 根据接收到的噪声信息检测结果确定发送参数。
发送端接收并解析接收端反馈过来的噪声信息检测结果, 利用上述噪 声信息检测结果进行发送参数的确定。
具体的发送参数的确定可参考第一实施例的步骤 S130以及第二实施例 中的发送参数确定模块 3102实现的功能。
步骤 S520, 按照确定的参数进行数据传输单元发送。
发送端会根据确定的具体的发送参数进行数据发送, 具体的, 按照确 定的重传类型, 对请求的重传数据进行重传; 按照确定的比特加载值对重 传数据以及普通数据(系统正常发送的数据, 即非重传数据)进行发送; 按照确定的重传队列长度, 对重传数据进行重传。
本发明实施例提供的另一种抵抗 OFDM系统中噪声的方法, 通过对噪 声的类型及相关信息进行检测, 然后更新相应的发送参数, 如采用相应的 重传类型, 降低的比特加载值或者更新后的重传队列长度等, 实现了对系 统中噪声的抵抗。
基于上述本发明实施例提供的另一种抵抗 OFDM系统中噪声的方法, 本发明第五实施例提供了另一种抵抗 OFDM系统中噪声的装置 600, 本装 置执行第四实施例所描述的方法, 具体包括: 接收器 610、 处理器 620和发 送器 630;
接收器 610,用于接收重传请求信息和引起数据传输单元传输错误的噪 声的噪声信息检测结果;
这里的重传请求信息中至少包括最近一些数据传输单元是否被正确传 输的状态 ACK或 NAK信息,其中 ACK代表接收端反馈给发送端的确认数 据传输单元被正确接收, NAK代表接收端反馈给发送端的数据传输单元未 被正确接收; 或者这里的重传请求信息至少包括: 需要重传的数据传输单 元的序列号。
引起数据传输单元传输错误的噪声的噪声信息检测结果包括噪声的类 型, 或者包括噪声类型以及高斯噪声变化情况, 脉沖噪声类型或者脉沖噪 声的长度和间隔等信息。
处理器 620,用于根据上述重传请求信息和噪声信息检测结果确定发送 参数; 具体的,
如果接收到的噪声类型检测结果是脉沖噪声, 且本 OFDM系统支持第一类 型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动请求重传 Type II HARQ, 第三类型增量冗余混合自动请求重传 TypeIIIIR-HARQ或第 三类型追赶合并混合自动请求重传 TypelllCC-HARQ 中的任一种或多种, 则确定发送参数里的重传类型为 Type l HARQ 以对抗脉沖对抗。 Type I HARQ类型是最筒单的 HARQ处理方式, 接收端通知发送端进行重传, 发 送端收到某个数据传输单元的重传请求信息之后, 启动对该数据传输单元 的重传, 重传的内容与原始数据传输单元完全相同, 即重传的数据传输单 元只是筒单的复制了原始数据, 接收端将收到错误的数据传输单元进行丢 弃处理, 因此每次重传数据包被正确解码的概率与原始数据相同;
如果接收到的噪声类型检测结果是高斯噪声, 且所述 OFDM系统支持 第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动请求 重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 TypellllR-HARQ 或第三类型追赶合并混合自动请求重传 TypelllCC-HARQ 中的任一种或多 种,则确定重传类型为 Type II HARQ、 TypellllR-HARQ或 TypelllCC-HARQ 中的任一种作为抵抗噪声的方式。 其中, Type ll HARQ, 即每次重传只传输 追加的冗余信息, 重传数据传输单元中不包含系统信息字节 /比特, 因此接 收端需要将重传的冗余信息和初始的冗余信息进行联合, 形成纠错能力更 强的 FEC码字, 比如第一次发送选择的是冗余版本 0, 第二次发送选择的 是冗余版本 1 , 然后两次的冗余进行联合, 形成具有更多冗余的 FEC码字, 纠错能力更强, 使得能够纠正由于高斯噪声或类高斯噪声引起的比特错误; Type III IR-HARQ, 即每次重传除了传输追加的冗余信息, 还会重传所有系 统信息字节 /比特, 重传数据传输单元因为包含所有系统信息字节 /比特, 以 及部分追加的冗余信息, 因此具有自解码能力, 接收端首先对重传分组进 行解码, 如果解码不成功, 则将多次传输的数据传输单元进行合并, 再进 行解码, 如果仍然不能正确解码, 则继续传输后续重传数据传输单元。 这 种方法由于每次都会对系统信息字节 /比特进行优化选择, 因此合并增益会 更大, 解码成功的概率越高, 越有利于对抗高斯噪声等引起的随机错误; 其中, Type ΙΠ CC-HARQ, 这种模式的 HARQ只有一种冗余版本, 要么是 全部冗余, 要么是其中一种冗余版本, 推荐采用全部冗余, 即每次重传具 有相同冗余版本的数据传输单元, 接收端则将每次收到的数据传输单元与 之前收到的所有数据传输单元根据各次接收时信道的信噪比 (SNR ) 获得 一个权重因子, 或计算最大似然比等方法进行软合并, 组合成一个具有更 强纠错能力的 FEC码字, 该模式实现起来非常筒单, 且合并增益高。
如果接收到的噪声类型检测结果是脉沖噪声, 且所述 OFDM系统只支 持第一类型混合自动请求重传 Type l HARQ, 则根据噪声信息中的脉沖噪 声的类型确定对应的重传队列长度; 或者根据噪声信息中的脉沖噪声的长 度和间隔确定对应的重传队列长度。 如果接收到的噪声类型检测结果是高斯噪声, 且所述 OFDM系统只支 持第一类型混合自动请求重传 Type I HARQ, 则根据噪声信息中的噪声变 化情况确定每个数据传输单元子载波的比特加载值, 具体的可以判断噪声 变化是否为增大, 如为噪声增大, 判断增大幅值是否超过阈值,如未超过阈 值,则降低每个数据传输单元子载波的比特加载值。 阈值可以根据具体网络 环境或者业务需求或者其他条件预先确定, 或者由网管动态调整或者根据 一定的预定条件自动更新, 例如可以取阈值为 6db, 如果噪声增大幅值在这 个 6db的阈值内, 可以在噪声变化幅值每增大 3db时, 降低每个数据传输 单元子载波的比特加载值一个单位, 如 2bit。 当然这里的 6bd, 3db, 2bit 都只是一个例子, 可以根据具体情况取其他值, 本发明不做限制。
发送器 630, 用于按照确定的参数发送数据传输单元。
发送器 630会根据确定的具体的发送参数进行数据发送, 具体的, 按 照确定的重传类型, 对请求的重传数据进行重传; 按照确定的比特加载值 对重传数据以及普通数据(系统正常发送的数据, 即非重传数据)进行发 送; 按照确定的重传队列长度, 对重传数据进行重传。
本发明实施例提供的抵抗 OFDM系统中噪声的装置, 通过对噪声的类 型及相关信息进行检测, 然后更新相应的发送参数, 实现了对 OFDM系统 中噪声的抵抗。
基于上述第四实施例提供的抵抗噪声的方法, 本发明第六实施例提供 了一种 OFDM系统中抵抗噪声的装置, 该装置的结构可参考附图 6。
本实施例提供的抵抗 OFDM系统中噪声的装置包括: 处理器、 发送器 和接收器; 其中,
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测; 具体的处理器可以完成的功能可参考第一实施例的步骤 S120。
发送器, 用于发送重传请求信息和所述处理器检测出的噪声信息检测 结果。 具体的, 发送器用于发送重传请求信息的功能实现可参考第一实施 例的步骤 S140。 其中, 重传请求信息由于重传请求的方式不同, 会包括不 同的信息。
具体来说, 重传请求的方式可以有多种, 一种是一次确认多个数据传 输单元的状态, 间接请求需要重传的数据传输单元, 那么重传请求信息中 至少需要包括最近一些数据传输单元是否被正确传输的状态 ACK或 NAK 消息,其中 ACK消息代表接收端反馈给发送端的确认数据传输单元被正确 接收, NAK消息代表接收端反馈给发送端的数据传输单元未被正确接收。
接收器, 用于接收按照更新后的发送参数发送来的数据传输单元。 本发明实施例提供的抵抗 OFDM系统中噪声的装置, 通过对噪声的类 型及相关信息进行检测, 然后更新相应的发送参数, 实现了对 OFDM系统 中噪声的抵抗。
基于上述第四, 五和六实施例, 本发明第七实施例提供了一种 OFDM 系统, 可以利用第五和第六实施例中的装置, 实现第四实施例中的方法。
参考附图 4, 上述 OFDM系统包括: 接收装置和发送装置。
其中, 接收装置, 具体可以为第六实施例中的装置; 发送装置可以为 第五实施例中描述的装置。
本发明第八实施例还提供一种装置, 可参考附图 6, 具体包括接收 器, 发送器和处理器, 其中,
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测; 根据接收器接收到的引起数据传输单元传输错误的噪声的噪声信息检 测结果, 确定发送参数。 块的功能; 确定参数功能的实现亦同, 可参考上述实施例中的发送参数的 确定步骤或相应参数确定模块的功能。
发送器, 用于发送重传请求信息和处理器检测出的引起数据传输单元 传输错误的噪声的噪声信息检测结果; 根据处理器确定的发送参数发送数 据传输单元。 同样的, 发送器的具体功能可以参考以上实施例中的相应部 分描述, 此处不再赘述。
接收器, 用于接收来自对端的重传请求信息和噪声信息检测结果。 本实施例描述的装置相当于本装置在系统中同时作为发送端和接受 端, 因此同时发送端和接受端的功能。 本领域技术人员很容易理解, 在一 个对称的系统中, 发送端和接受端是对等的概念, 而对于产品或设备本身 而言, 其在上下行数据传输过程中分别承担发送端和接受端的角色, 因此 兼具发送端和接收端功能。 下一个实施例亦同。
本实施例所揭示的装置, 在作为接受端时, 对接收到的数据进行检测, 确定需要进行重传后, 检测噪声情况, 并将噪声检测结果和重传请求发送 给对端; 在作为发送端时, 根据接收到的对端发送的重传请求和噪声检测 结果, 确定对应的发送参数, 并根据该确定的发送参数将数据发送给对端。
本发明第九施例还提供一种装置, 可参考附图 6, 具体包括接收器, 发 送器和处理器, 其中,
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测, 获得所述噪声的噪声信息检测结果, 并根据该噪声信息检测结果确定 发送参数; 根据接收器接收到的发送参数发送数据传输单元;
发送器, 用于发送处理器确定的发送参数和重传请求信息;
接收器, 用于接收对端发送的发送参数和重传请求信息。
同第八实施例中的描述, 本实施例中各个单元模块的功能可以参考以 上各实施例中对应功能的执行或实现。 本实施例所描述的设备也是同样具 有发送端和接受端的角色, 作为接受端时, 其执行功能: 在本端进行噪声 信息检测并根据检测结果确定发送参数, 将该发送参数和重传请求发送给 发送端, 接收对端发送的数据; 作为发送端时, 其执行功能: 根据对端发 送的发送参数, 根据该接收的发送参数进行数据的发送。
本发明第十实施例公开了一种 OFDM系统,该系统中包含发送装置和接 收装置, 其中发送装置和接收装置均为如第八实施例中描述的装置; 或者 其发送装置和接收装置均为如第九实施例中描述的装置。
本发明实施例提供的抵抗 OFDM系统中噪声的方法,装置和系统,通过 对噪声的类型及相关信息进行检测, 然后更新相应的发送参数, 如采用相 应的重传类型, 降低的比特加载值或者更新后的重传队列长度等, 实现了 对系统中噪声的抵抗。
通过以上的实施方式的描述, 本领域的技术人员可以清楚地了解到 本发明可借助软件加必需的硬件平台的方式来实现, 当然也可以全部通 过硬件来实施。 基于这样的理解, 本发明的技术方案对背景技术做出贡 献的全部或者部分可以以软件产品的形式体现出来, 该计算机软件产品 可以存储在存储介质中, 如 ROM/RAM、 磁碟、 光盘等, 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)执行本发明各个实施例或者实施例的某些部分所述的方法。
本发明所提及的数据是一个抽象概念, 指在系统中传输的信息, 具体 的, 可以通过数据传输单元的形式进行传输。
以上所述, 仅为本发明较佳的具体实施方式, 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披露的技术范 围内, 可轻易想到的变化或替换, 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该以权利要求的保护范围为准。

Claims

权利要求
1、一种抵抗正交频分复用 OFDM系统中噪声的方法, 其特征在于, 包 括:
接收重传请求信息和引起数据传输单元传输错误的噪声的噪声信息检 测结果;
根据所述噪声信息检测结果确定发送参数;
根据确定的发送参数发送数据传输单元。
2、 如权利要求 1所述的抵抗 OFDM系统中噪声的方法, 其特征在于, 所述根据所述噪声信息检测结果确定发送参数具体为:
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统支持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自 动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定重传类型为所述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种;
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type l HARQ, 则根据所述噪声信息 检测结果中的的脉沖噪声的类型确定对应的重传队列长度, 或者根据所述 噪声信息检测结果中的的脉沖噪声的长度和间隔, 确定对应的重传队列长 度。
3、 如权利要求 2所述的抵抗 OFDM系统中噪声的方法, 其特征在于, 所述根据确定的发送参数发送数据传输单元具体为:
根据确定的重传类型或确定的重传队列长度发送重传数据传输单元。
4、 如权利要求 1所述的抵抗 OFDM系统中噪声的方法, 其特征在于, 所述根据所述噪声信息检测结果确定发送参数具体为:
如果所述噪声信息检测结果中的噪声类型为高斯噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type l HARQ, 则根据所述噪声信息 中的噪声变化情况判断所述噪声的噪声增大幅度是否超过阈值, 如未超过 阈值,则降低每个数据传输单元子载波的比特加载值。
5、 如权利要求 4所述的抵抗 OFDM系统中噪声的方法, 其特征在于, 所述根据所述噪声信息中的噪声变化情况判断所述噪声的噪声增大幅度是 否超过阈值,如未超过阈值,则降低比特加载值具体为:
如果所述噪声信息中的噪声变化情况为噪声增大, 且噪声增大的值不 大于 6db,则噪声每增大 3db, 降低每个数据传输单元子载波的比特加载数 2bit。
6、如权利要求 4或 5所述的抵抗 OFDM系统中噪声的方法,其特征在 于, 所述根据确定的发送参数发送数据传输单元具体为:
根据降低后的每个数据传输单元子载波的比特加载值发送重传数据传 输单元和普通数据传输单元。
7、一种抵抗正交频分复用 OFDM系统中噪声的方法, 其特征在于, 包 括:
对引起数据传输单元传输错误的噪声的噪声信息进行检测;
发送重传请求信息和所述噪声的噪声信息检测结果;
接收按照更新后的发送参数发送来的数据传输单元。
8、 如权利要求 7所述的抵抗 OFDM系统中噪声的方法, 其特征在于, 所述对引起数据传输单元传输错误的噪声的噪声信息进行检测具体为: 对引起数据传输单元传输错误的噪声的噪声信息进行检测, 确定所述 噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪声, 检测所述脉沖噪 声的长度和间隔; 或者进一步根据测得的脉沖噪声的长度和间隔确定所述 脉沖噪声的类型;
如果所述噪声的噪声类型为高斯噪声, 检测所述高斯噪声相对于稳定 状态时的变化情况。
9、一种抵抗正交频分复用 OFDM系统中噪声的装置, 其特征在于, 包 括接收器, 处理器和发送器, 其中:
接收器, 用于接收重传请求信息和引起数据传输单元传输错误的噪声 的噪声信息检测结果;
处理器, 用于根据接收器接收的所述噪声信息检测结果确定发送参数; 发送器, 用于根据处理器确定的发送参数发送数据传输单元。
10、如权利要求 9所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述处理器, 具体用于当所述噪声信息检测结果中的噪声类型为脉沖噪声, 且所述 OFDM系统支持第一类型混合自动请求重传 Type I HARQ,并且支持 第二类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请 求重传 TypellllR-HARQ 或第三类型追赶合并混合自动请求重传 Typelll CC-HARQ中的任一种或多种, 则确定重传类型为所述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种;
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息中 的脉沖噪声的类型确定对应的重传队列长度; 或者根据所述噪声信息中的 脉沖噪声的长度和间隔确定对应的重传队列长度。
11、如权利要求 10所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述发送器, 具体用于根据确定的重传类型或确定的重传队列长度发送重 传数据。
12、如权利要求 9所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述处理器, 具体用于:如果所述噪声信息检测结果中的噪声类型为高斯噪 声,且所述 OFDM系统只支持第一类型混合自动请求重传 Type I HARQ,则 根据所述噪声信息中的噪声变化情况判断所述噪声的噪声增大幅值是否超 过阈值,如未超过阈值,则降低每个数据传输单元子载波的比特加载值。
13、如权利要求 12所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述发送器, 具体用于根据确定的比特记载值发送重传数据传输单元和普 通数据传输单元。
14、 一种抵抗正交频分复用 OFDM系统中噪声的装置, 其特征在于, 包括接收器, 处理器和发送器, 其中:
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测;
发送器, 用于发送重传请求信息和所述处理器检测出的噪声信息检测 结果;
接收器, 用于接收按照更新后的发送参数发送来的数据传输单元。
15、如权利要求 14所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述处理器, 具体用于对引起数据传输单元传输错误的噪声的噪声信息进 行检测, 确定所述噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪声 时, 检测所述脉沖噪声的类型、 长度和间隔; 或者进一步根据测得的脉沖 噪声的长度和间隔确定所述脉沖噪声的类型;
如果所述噪声的噪声类型为高斯噪声, 检测所述高斯噪声相对于稳定 状态时的变化情况。
16、 一种抵抗正交频分复用 OFDM系统中噪声的方法, 其特征在于, 包括:
对引起数据传输单元传输错误的噪声进行检测, 获得引起数据传输单 元传输错误的噪声的噪声信息检测结果;
根据所述噪声的噪声信息检测结果, 确定发送参数;
发送重传请求信息和所述确定的发送参数;
接收按照所述确定的发送参数发送的数据传输单元。
17、如权利要求 16所述的抵抗 OFDM系统中噪声的方法,其特征在于, 根据所述噪声的噪声信息检测结果, 确定发送参数具体为:
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统支持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自 动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请求重传 Type ΠΙ CC-HARQ中的任 一种或多种, 则确定重传类型为所述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 Typelll IR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种; 如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息检 测结果中的的脉沖噪声的类型确定对应的重传队列长度, 或者根据所述噪 声信息检测结果中的的脉沖噪声的长度和间隔, 确定对应的重传队列长度; 如果所述噪声信息检测结果中的噪声类型为高斯噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息中 的噪声变化情况判断所述噪声的噪声增大幅度是否超过阈值,如未超过阈值 则降低每个数据传输单元子载波的比特加载值。
18、如权利要求 17所述的抵抗 OFDM系统中噪声的方法,其特征在于, 所述根据所述噪声信息中的噪声变化情况判断所述噪声的噪声增大幅 度是否超过阈值,如未超过阈值,则降低比特加载值具体为:
如果所述噪声信息中的噪声变化情况为噪声增大, 且噪声增大值不大 于 6db,则噪声每增大 3db, 降低每个数据传输单元子载波的比特加载数量 2bit。
19、 如权利要求 16-18任一所述的抵抗 OFDM系统中噪声的方法, 其 特征在于,
所述对引起数据传输单元传输错误的噪声进行检测具体为:
对引起数据传输单元传输错误的噪声的噪声信息进行检测, 确定所述 噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪声, 检测所述脉沖噪 声的长度和间隔, 或者进一步根据测得的脉沖噪声的长度和间隔确定所述 脉沖噪声的类型;
如果所述噪声的噪声类型为高斯噪声, 检测所述高斯噪声相对于稳定 状态时的变化情况。
20、 一种抵抗正交频分复用 OFDM系统中噪声的装置, 其特征在于, 包括处理器, 发送器和接收器, 其中:
处理器, 用于对引起数据传输单元传输错误的噪声进行检测, 获得引 起数据传输单元传输错误的噪声的噪声信息检测结果; 并根据该噪声信息 检测结果确定发送参数;
发送器, 用于发送错误数据传输单元的重传请求信息和所述处理器确 定的发送参数;
接收器, 用于接收按照所确定的发送参数发送来的数据传输单元。
21、如权利要求 20所述的抵抗 OFDM系统中噪声的装置,其特征在于, 所述处理器具体包括检测模块和发送参数确定模块,
其中, 检测模块用于对引起数据传输单元传输错误的噪声的噪声信息 进行检测, 确定所述噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪 声, 检测所述脉沖噪声的长度和间隔, 或者进一步根据测得的脉沖噪声的 长度和间隔确定所述脉沖噪声的类型; 如果所述噪声的噪声类型为高斯噪 声, 检测所述高斯噪声相对于稳定状态时的变化情况;
发送参数确定模块用于如果检测模块检测获得的所述噪声信息检测结 果中的噪声类型为脉沖噪声,且所述 OFDM系统支持第一类型混合自动请求 重传 Type I HARQ,并且支持第二类型混合自动请求重传 Type II HARQ, 第 三类型增量冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并 混合自动请求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型 为所述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种; 如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息检 测结果中的的脉沖噪声的类型确定对应的重传队列长度, 或者根据所述噪 声信息检测结果中的的脉沖噪声的长度和间隔, 确定对应的重传队列长度; 如果所述噪声信息检测结果中的噪声类型为高斯噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息中 的噪声变化情况判断所述噪声的噪声增大幅度是否超过阈值,如未超过阈值 则降低每个数据传输单元子载波的比特加载值。
22、 一种抵抗正交频分复用 OFDM系统中噪声的装置, 其特征在于, 包括处理器, 发送器和接收器, 其中:
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测; 根据接收器接收到的引起数据传输单元传输错误的噪声的噪声信息检 测结果, 确定发送参数;
发送器, 用于发送重传请求信息和处理器检测出的引起数据传输单元 传输错误的噪声的噪声信息检测结果; 根据处理器确定的发送参数发送数 据传输单元;
接收器, 用于接收来自对端的重传请求信息和噪声信息检测结果。
23、 如权利要求 22所述的装置, 其特征在于,
所述处理器具体包括检测模块和发送参数确定模块,
其中, 检测模块用于对引起数据传输单元传输错误的噪声的噪声信息 进行检测, 确定所述噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪 声, 检测所述脉沖噪声的长度和间隔, 或者进一步根据测得的脉沖噪声的 长度和间隔确定所述脉沖噪声的类型; 如果所述噪声的噪声类型为高斯噪 声, 检测所述高斯噪声相对于稳定状态时的变化情况;
发送参数确定模块用于如果所述接收器接收到的噪声信息检测结果中 的噪声类型为脉沖噪声,且所述 OFDM系统支持第一类型混合自动请求重传 Type I HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类 型增量冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并混合 自动请求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所 述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种;
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息检 测结果中的的脉沖噪声的类型确定对应的重传队列长度, 或者根据所述噪 声信息检测结果中的的脉沖噪声的长度和间隔, 确定对应的重传队列长度; 如果所述噪声信息检测结果中的噪声类型为高斯噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息中 的噪声变化情况判断所述噪声的噪声增大幅度是否超过阈值,如未超过阈值 则降低每个数据传输单元子载波的比特加载值。
24、 一种抵抗正交频分复用 OFDM系统中噪声的装置, 其特征在于, 包括处理器, 发送器和接收器, 其中:
处理器, 用于对引起数据传输单元传输错误的噪声的噪声信息进行检 测, 获得所述噪声的噪声信息检测结果, 并根据该噪声信息检测结果确定 发送参数; 根据接收器接收到的发送参数发送数据传输单元;
发送器, 用于发送处理器确定的发送参数和重传请求信息; 接收器, 用于接收对端发送的发送参数和重传请求信息。
25、 如权利要求 24所述的装置, 其特征在于,
所述处理器具体包括检测模块和发送参数确定模块,
其中, 检测模块用于对引起数据传输单元传输错误的噪声的噪声信息 进行检测, 确定所述噪声的噪声类型, 如果所述噪声的噪声类型为脉沖噪 声, 则检测获得所述脉沖噪声的长度和间隔, 或者进一步根据测得的脉沖 噪声的长度和间隔确定所述脉沖噪声的类型; 如果所述噪声的噪声类型为 高斯噪声, 检测获得所述高斯噪声相对于稳定状态时的变化情况;
发送参数确定模块用于如果所述检测模块检测获得的噪声信息检测结 果中的噪声类型为脉沖噪声,且所述 OFDM系统支持第一类型混合自动请求 重传 Type I HARQ,并且支持第二类型混合自动请求重传 Type II HARQ, 第 三类型增量冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并 混合自动请求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型 为所述 Type I HARQ;
如果所述噪声信息检测结果中的噪声类型为满足高斯分布或类高斯分 布的噪声, 且所述 OFDM 系统支持第一类型混合自动请求重传 Type l HARQ,并且支持第二类型混合自动请求重传 Type II HARQ、 第三类型增量 冗余混合自动请求重传 TypellllR-HARQ或第三类型追赶合并混合自动请 求重传 TypelllCC-HARQ 中的任一种或多种, 则确定重传类型为所述第二 类型混合自动请求重传 Type II HARQ、 第三类型增量冗余混合自动请求重 传 Type III IR-HARQ 或第三类型追赶合并混合自动请求重传 Type III CC-HARQ中的任一种;
如果所述噪声信息检测结果中的噪声类型为脉沖噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息检 测结果中的的脉沖噪声的类型确定对应的重传队列长度, 或者根据所述噪 声信息检测结果中的的脉沖噪声的长度和间隔, 确定对应的重传队列长度; 如果所述噪声信息检测结果中的噪声类型为高斯噪声,且所述 OFDM系 统只支持第一类型混合自动请求重传 Type I HARQ,则根据所述噪声信息中 的噪声变化情况判断所述噪声的噪声增大幅度是否超过阈值,如未超过阈值 则降低每个数据传输单元子载波的比特加载值。
26、 一种正交频分复用 OFDM系统, 其特征在于, 包括: 相互连接的 接收装置和发送装置,
其中,所述接收装置为如权利要求 14-15所述的装置; 所述发送装置为 如权利要求 9-13所述的装置; 或者
所述接收装置为如权利要求 20-21所述的装置;所述发送装置用于接收 所述接收装置发送来的错误数据传输单元的重传请求信息及发送参数, 按 照所述接收到的发送参数向所述接收端发送数据传输单元;
或者所述接收装置和为如权利要求 22-23所述的装置;所述发送装置为 如权利要求 22-23所述的装置;
或者所述接收装置和为如权利要求 24-25所述的装置;所述发送装置为 如权利要求 24-25所述的装置。
27、 如权利要求 26所述的系统, 所述发送装置为 CPE设备, 所述接收 装置为 FTTDp点设备; 或者
所述发送装置为 FTTDp设备, 所述接收装置为 CPE点设备。
28、 一种计算机程序产品, 其特征在于, 包括计算机程序代码, 当一 个计算机单元执行所述计算机程序代码时, 该计算机单元执行如权利要求
1-6, 或者 7-8, 或者 16-19所述的方法。
PCT/CN2012/076951 2012-06-14 2012-06-14 抵抗ofdm系统中噪声的方法、装置和ofdm系统 WO2013185332A1 (zh)

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CN102340385A (zh) * 2010-07-19 2012-02-01 中兴通讯股份有限公司 混合自动重传请求处理方法及装置

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