WO2015027514A1 - Procédé de transmission de données, procédé de réception de données et dispositif - Google Patents

Procédé de transmission de données, procédé de réception de données et dispositif Download PDF

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Publication number
WO2015027514A1
WO2015027514A1 PCT/CN2013/082775 CN2013082775W WO2015027514A1 WO 2015027514 A1 WO2015027514 A1 WO 2015027514A1 CN 2013082775 W CN2013082775 W CN 2013082775W WO 2015027514 A1 WO2015027514 A1 WO 2015027514A1
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Prior art keywords
orthogonal
data
subcarrier
data symbols
ofdm
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PCT/CN2013/082775
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English (en)
Chinese (zh)
Inventor
刘永俊
李蕊
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201380076004.1A priority Critical patent/CN105144649A/zh
Priority to PCT/CN2013/082775 priority patent/WO2015027514A1/fr
Publication of WO2015027514A1 publication Critical patent/WO2015027514A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a data transmission method, a data receiving method, and an apparatus. Background technique
  • Orthogonal Frequency Division Multiplexing is a special multi-carrier modulation technology.
  • the transmitting end of an OFDM system transmits serial serial bit sequences to be transmitted through multiple orthogonal orthogonal subcarriers. Parallel output, corresponding reception at the receiving end.
  • the OFDM signal outputted by the transmitting end has a higher Peak to Average Power Ratio (PAPR), which is simply referred to as a peak-to-average ratio, thereby causing the output OFDM signal to be transmitted.
  • PAPR Peak to Average Power Ratio
  • the transmitting end uses a sequence encoding to reduce the PAPR method to transmit a binary bit sequence, specifically by constructing a transmission code set that reduces the PAPR, for example: a block code, an M-based sequence code, and a Reed-Muller code (Reed) -Muller, RM) Gray complementary code, which uses the code set to encode the binary bit sequence, and performs constellation modulation, carries the coded, and constellation-modulated binary bit sequence onto each orthogonal subcarrier, and performs fast Fu
  • IFFT inverse inverse Fourier Transform
  • Embodiments of the present invention provide a data transmission method, a data receiving method, and a device, which are used to solve the problem that a sequence coding reduces PAPR, and the resulting error rate increases, the transmission quality is poor, and the orthogonal frequency division is improved.
  • the transmission performance of the multiplexed system is improved.
  • the first aspect provides a data transmission method for orthogonal frequency division multiplexing (OFDM) systems in which data is transmitted by using orthogonal orthogonal subcarriers, including: Using a pre-configured transmission code set for reducing PAPR, sequence-coding the binary bit sequence to be transmitted, and performing constellation modulation to obtain data symbols;
  • OFDM orthogonal frequency division multiplexing
  • the data information includes: the data symbol and the pilot sequence
  • the respective OFDM signals are transmitted in parallel.
  • the second aspect provides a data receiving method for orthogonal frequency division multiplexing (OFDM) systems in which data is transmitted by orthogonal orthogonal subcarriers, including:
  • each OFDM demodulation signal Performing OFDM demodulation on each received OFDM signal to obtain each OFDM demodulation signal; extracting each OFDM demodulation signal by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier to obtain a pilot sequence ;
  • the data symbols carried by the respective orthogonal subcarriers are subjected to sequence decoding and constellation demodulation using a pre-configured transmission code set for reducing PAPR to obtain a binary bit sequence.
  • a third aspect is to provide a data transmitting apparatus for use in an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system for transmitting data using orthogonal orthogonal subcarriers, including:
  • a sequence coding and constellation modulation module for performing sequence coding using a pre-configured transmission code set for reducing PAPR, sequence coding of a binary bit sequence to be transmitted, and performing constellation modulation to obtain a data symbol; the binary bit sequence is used to indicate send data;
  • a first bearer module configured to carry the data symbols by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier;
  • a replacement module configured to replace the data symbol carried by the predetermined first orthogonal subcarrier in each of the orthogonal subcarriers with a pilot sequence
  • a modulation module configured to perform OFDM modulation on each orthogonal subcarrier carrying data information, to obtain each OFDM signal;
  • the data information includes: the data symbol and the pilot sequence;
  • a sending module configured to send the respective OFDM signals in parallel.
  • a fourth aspect is to provide a data receiving apparatus for use in an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system for transmitting data using orthogonal orthogonal subcarriers, including:
  • a receiving module configured to receive each OFDM signal in parallel
  • a demodulation module configured to perform OFDM demodulation on each received OFDM signal to obtain each OFDM demodulation signal
  • a first extracting module configured to extract, by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier, the OFDM demodulated signal to obtain a pilot sequence
  • a first determining module configured to determine a data symbol that is a fixed value or a random value as the first orthogonal subcarrier
  • a second extraction module configured to extract, by using each of the orthogonal subcarriers except the first orthogonal subcarrier, the OFDM demodulated signal according to the pilot sequence, to obtain a second orthogonal subcarrier Data symbols carried by each orthogonal subcarrier;
  • the sequence decoding and constellation demodulation module is configured to perform sequence decoding and constellation demodulation on the data symbols carried by the respective orthogonal subcarriers by using a pre-configured transmission code set for reducing PAPR to obtain a binary bit sequence.
  • the fifth aspect is to provide a data transmitting apparatus, which is applied to an Orthogonal Frequency Division Multiplexing (OFDM) OFDM system that uses each orthogonal orthogonal subcarrier to transmit data, and includes:
  • OFDM Orthogonal Frequency Division Multiplexing
  • a processor configured to: use a pre-configured transmission code set for reducing PAPR, sequence encode a binary bit sequence to be transmitted, and perform constellation modulation to obtain a data symbol; Determining data to be transmitted; carrying the data symbols by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier; and predetermining the first orthogonal subcarriers among the orthogonal subcarriers And the data symbol carried by the carrier is replaced by a pilot sequence; OFDM modulation is performed on each orthogonal subcarrier carrying the data information to obtain each OFDM signal; the data information includes: the data symbol and the pilot sequence ;
  • a communication interface configured to send the respective OFDM signals in parallel.
  • a sixth aspect is to provide a data receiving apparatus for applying orthogonality orthogonal to each other
  • the method includes:
  • a communication interface configured to receive each OFDM signal in parallel
  • a processor configured to: perform OFDM demodulation on each received OFDM signal to obtain respective OFDM demodulated signals; using the predetermined first orthogonal subcarriers in each orthogonal subcarrier, Extracting each OFDM demodulated signal to obtain a pilot sequence; determining to use a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using each orthogonal subcarrier except the first orthogonal subcarrier, And extracting, according to the pilot sequence, the OFDM demodulated signals to obtain data symbols carried by orthogonal orthogonal subcarriers except the first orthogonal subcarrier; using a pre-configured transmission code set for reducing PAPR, Performing sequence decoding and constellation demodulation on the data symbols carried by the respective orthogonal subcarriers to obtain a binary bit sequence.
  • the data sending method, the data receiving method and the device provided by the embodiment of the present invention by using orthogonal orthogonal subcarriers corresponding to data symbols in each orthogonal subcarrier at the transmitting end, carrying data symbols, obtaining data subcarriers,
  • the data symbols carried by the predetermined first orthogonal subcarriers in the orthogonal subcarriers are replaced by pilot sequences, the pilot subcarriers are obtained, and the OFDM modulation is performed according to the data subcarriers and the pilot subcarriers.
  • FIG. 1 is a schematic flowchart of a data sending method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of a data sending method according to another embodiment of the present invention.
  • FIG. 3 is a schematic flowchart of a data receiving method according to an embodiment of the present invention
  • FIG. 4 is a schematic flowchart of a data receiving method according to another embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a data sending apparatus according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of a structure of a data sending apparatus according to another embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a data receiving apparatus according to an embodiment of the present invention.
  • FIG. 8 is a schematic structural diagram of a data receiving apparatus according to another embodiment of the present invention.
  • an Orthogonal Frequency Division Multiplexing system is used to transmit data by orthogonal orthogonal subcarriers, as shown in FIG. 1 . As shown, including:
  • the binary bit sequence is used to indicate the data to be sent.
  • a pre-configured transmission code set for reducing PAPR including one of RM Gray Complementary Code, M-Sequence, and Block Code.
  • the data symbols are carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier.
  • each data symbol is carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier according to a pre-established correspondence between each orthogonal subcarrier and each data symbol, to obtain each data subcarrier.
  • the first orthogonal subcarrier is at least one, and the number of the first orthogonal subcarriers is predetermined.
  • the value of the pilot sequence is predetermined.
  • the 104 Perform OFDM modulation on each orthogonal subcarrier carrying data information to obtain each OFDM signal.
  • the data information includes: the data symbol and the pilot sequence.
  • the orthogonal subcarriers except for the DC orthogonal subcarriers in each orthogonal subcarrier are pre-established, and the correspondence relationship with the data symbols is established in advance.
  • the data symbols carried by the DC orthogonal subcarriers are removed, and further, the idle third of the orthogonal subcarriers is utilized.
  • the data information further includes the data symbol after the second phase rotation.
  • k is a natural number
  • k is less than 2 to the power of m.
  • the above-mentioned pre-established correspondence relationship has a slightly higher PAPR than the method in which the sub-carrier wave number is continuously corresponding, but the maximum PAPR is basically about 3 dB.
  • the number of orthogonal subcarriers in the orthogonal frequency division multiplexing system is 2 to the power of m.
  • h is the number of bits of a binary bit sequence carried by a data symbol.
  • floor means rounding down.
  • the embodiment further provides a possible implementation manner.
  • L 17 bits
  • the number of orthogonal subcarriers is 5 to the power of 5, that is, 32 orthogonal subcarriers.
  • the binary bit sequence is sequence-coded, for example: RM Gray complementary coding, and constellation mapping, data symbols are obtained, and 32 orthogonal subcarriers are used to carry data symbols, for example: using orthogonal subcarrier numbers of -16 to 15 Orthogonal subcarriers, which sequentially carry individual data symbols.
  • the orthogonal subcarriers with the subcarrier number of 0, that is, the DC orthogonal subcarriers are removed.
  • the data symbols carried by the DC orthogonal subcarriers are removed.
  • the predetermined first orthogonal subcarriers are orthogonal subcarriers with subcarrier numbers -7 and 7, and subcarrier numbers -7 and 7 are removed.
  • the data symbols carried by the carrier are respectively inserted into the orthogonal subcarriers with subcarrier numbers -7 and 7 to obtain pilot subcarriers.
  • the pilot subcarrier and the data subcarrier are IFFT-transformed, and after adding the cyclic prefix, they are sent in parallel.
  • the PAPR based on the superimposed random signal is not greater than the sum of the PAPRs of the respective signals, so that after the OFDM signal constructed by the pilot sequence is inserted at the transmitting end, the PAPR can still be maintained.
  • the OFDM signal constructed by the binary bit sequence can be recorded as a random signal X. Since the binary bit sequence is sequence-encoded using a pre-configured transmission code set for reducing PAPR, the PAPR of the random signal X is not more than 3 dB.
  • the pilot sequence, and the data symbols replaced by the pilot sequence and the inverse of the data symbols carried by the DC orthogonal subcarriers constitute a random signal Y.
  • the PAPR of the random signal Y is not large.
  • the maximum value of the PAPR of the N orthogonal subcarriers carrying the signal is (10 lgN) dB, which is actually less than the maximum value, for example: 2 first orthogonal subcarriers, 1 DC orthogonal subcarrier, then random
  • the data symbols are carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier, to obtain data subcarriers, and the first orthogonal subcarriers determined in each orthogonal subcarrier are determined.
  • the carried data symbol is replaced by a pilot sequence, and a pilot subcarrier is obtained.
  • OFDM modulation is performed, and an OFDM signal is sent to the receiving end in parallel, because each orthogonal subcarrier is
  • the data symbols carried by the predetermined first orthogonal subcarriers in the carrier are replaced by pilot sequences, so that the pilot sequences are used for phase tracking or channel estimation, which improves the transmission performance of the OFDM system.
  • the data transmission method is applicable to a transmitting end of an orthogonal frequency division multiplexing system, where an orthogonal frequency division multiplexing system is used to utilize mutually orthogonal
  • the orthogonal subcarrier transmits data, as shown in FIG. 2, including:
  • the binary bit sequence is used to indicate the data to be sent.
  • the data symbols are carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier, to obtain data subcarriers.
  • the receiving end cannot receive the channel correctly. Therefore, if the DC orthogonal subcarrier in each orthogonal subcarrier carries the data symbol, the removal is performed. The data symbols carried by the DC orthogonal subcarriers.
  • the data information further includes the data symbols after the second phase rotation.
  • the OFDM system usually reserves a part of idle orthogonal subcarriers, that is, second orthogonal subcarriers, on both sides of the channel edge to prevent interference to adjacent channels, and generally idle second orthogonal subcarriers.
  • the number will not be much.
  • based on RM Gray complementary coding since the number of obtained data symbols is a power of 2, the number of orthogonal subcarriers carrying data symbols is also a power of 2, and therefore, there are enough The second orthogonal subcarrier that is idle.
  • the number of bits of the binary bit sequence input in one OFDM symbol period is 11, and 11 bits of information are carried by 32 orthogonal subcarriers.
  • the data symbols to be carried on 32 orthogonal subcarriers are obtained by constellation modulation, and the 32 data symbols are corresponding to subcarriers with subcarrier numbers of 16 to 15.
  • the subcarrier numbers of the first orthogonal subcarrier carrying the pilot sequence are -7 and 7, and the data symbols carried on the orthogonal subcarriers with the subcarrier numbers -7 and 7 are replaced by the pilot sequence, and the subcarriers are used.
  • the data symbols carried on the orthogonal subcarriers numbered -7 and 7 are moved to the orthogonal subcarriers of subcarrier numbers -17 and 17.
  • the first phase rotation angle is based on a pilot sequence, a first orthogonal subcarrier, and a second orthogonal
  • the subcarriers and/or the third orthogonal subcarriers are determined such that the PAPR of each OFDM signal transmitted in parallel is minimized.
  • first orthogonal subcarriers For different numbers of first orthogonal subcarriers, pilot sequences, subcarrier numbers of first orthogonal subcarriers for carrying pilots, and subcarrier numbers and/or third positives of second orthogonal subcarriers
  • the subcarrier number of the subcarrier can be determined to determine different phase rotation angles.
  • the number of first orthogonal subcarriers, the pilot sequence, the subcarrier sequence number of the first orthogonal subcarrier used to carry the pilot, and the subcarrier sequence number and/or the third orthogonal of the second orthogonal subcarrier In the case where the subcarrier numbers of the subcarriers are all determined, in a range of possible values of the first phase rotation angle, for example, ⁇ 0, ⁇ /2, ⁇ , 3 ⁇ /2 ⁇ , a total of four angles are simulated and obtained.
  • the first phase rotation angle and the second phase rotation angle need to be modified.
  • the first orthogonal subcarrier, the second orthogonal subcarrier, the third orthogonal subcarrier, and the pilot sequence are respectively stored at the transmitting end and the receiving end, so that according to the first orthogonal subcarrier, the second The orthogonal phase carrier, the third orthogonal subcarrier, and the pilot sequence are calculated to obtain a first phase rotation angle and/or a second phase rotation angle.
  • the first orthogonal subcarrier, the second orthogonal subcarrier, the third orthogonal subcarrier, and the pilot sequence are fixed, the first orthogonal subcarrier, the second orthogonal subcarrier, and the third orthogonal sub
  • the carrier and pilot sequences, and the first phase rotation angle and/or the second phase rotation angle are stored at the transmitting end and the receiving end, respectively.
  • the pilot sequence is a pseudo-random bit sequence
  • the first orthogonal subcarrier carrying the pilot needs to be determined by using a traveling pi lot to counter the time-varying channel. Affecting, so that the value of the pilot sequence and the first orthogonal subcarrier carrying the pilot tend to vary with the 0FDM symbol period.
  • the first phase rotation angle and/or the second phase rotation can be obtained by calculation. The way of the angle.
  • the 32 data symbols are carried by orthogonal subcarriers with subcarrier numbers of 16 to 16, and the data symbols carried on the orthogonal subcarriers with subcarrier numbers -7 and 7 are replaced by pilot sequences, and replaced by
  • the data symbols carried on the orthogonal subcarriers of -7 and 7 are carried on orthogonal subcarriers with subcarrier numbers -17 and 17, and the data carried on the orthogonal subcarriers of -7 and 7 under replacement are carried.
  • the symbols are respectively phase-rotated. If the determined first phase rotation angles of the PAPRs of the transmitted OFDM information are combined to be (0, ⁇ ), the orthogonality of -7 and 7 is replaced according to (0, ⁇ ) pairs.
  • the data symbols carried on the subcarriers are respectively phase rotated.
  • Each of the orthogonal subcarriers carrying the data symbols, data symbols, and pilot sequences after the first phase rotation is subjected to inverse fast Fourier transform to obtain respective OFDM signals.
  • the data symbol carried by the deleted DC orthogonal subcarrier is carried, and the deleted location is determined according to a predetermined second phase rotation angle.
  • the data symbols carried by the DC orthogonal subcarriers are phase rotated to obtain the data symbols after the second phase rotation, and correspondingly, the data symbols after the first phase rotation are carried, the data symbols after the second phase rotation,
  • Each of the orthogonal subcarriers of the data symbol and the pilot sequence is subjected to an inverse fast Fourier transform to obtain each OFDM signal.
  • the number of orthogonal subcarriers in the orthogonal frequency division multiplexing system is 2 to the power of m.
  • h is the number of bits of a binary bit sequence carried by a data symbol.
  • the data symbols are carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier, to obtain data subcarriers, and the first orthogonal subcarriers determined in each orthogonal subcarrier are determined.
  • the carried data symbol is replaced with a pilot sequence, and the pilot subcarrier is obtained.
  • the 0FDM modulation is performed, and the 0FDM signal is sent to the receiving end in parallel, because each orthogonal subcarrier is
  • the data symbols carried by the predetermined first orthogonal subcarriers in the carrier are replaced by pilot sequences, thereby improving phase tracking or channel estimation by using pilot sequences. Transmission performance of OFDM systems.
  • 3 is a data receiving method according to an embodiment of the present invention, used in an orthogonal frequency division multiplexing system, where the orthogonal frequency division multiplexing system is configured to transmit data by using orthogonal orthogonal subcarriers, as shown in the figure. 3, including:
  • a Fast Fourier Transform (FFT) transform is performed on each OFDM signal to obtain respective OFDM demodulated signals.
  • FFT Fast Fourier Transform
  • the pilot sequence is used for phase tracking and channel estimation.
  • phase tracking and channel estimation are performed by using pilot sequences, and each data symbol carried by each orthogonal subcarrier except the first orthogonal subcarrier is obtained.
  • a pre-configured transmission code set for reducing PAPR such as RM Gray complementary coding
  • RM Gray complementary coding has strong error correction capability, and the number of first orthogonal subcarriers is small
  • a fixed value or a random value may be used as The data symbols carried by the first orthogonal subcarrier are within the error correction capability of the RM Gray complementary coding due to the operation. It is found that, in the case that the number of orthogonal subcarriers in the OFDM system is large, the data symbols carried by the first orthogonal subcarrier are replaced by the pilot sequence corresponding to the transmitting end, and the fixed value or the random value is taken as the first at the receiving end.
  • the performance difference caused by the operation of the data symbols carried by the orthogonal subcarriers is small, and the PAPR is within the IdB.
  • the operation of using the fixed value or the random value as the data symbol carried by the first orthogonal subcarrier is not used at the receiving end, even if When the data packet is only one hundred bytes, the transmission performance will deteriorate by more than 4 dB. It can be seen that if the data packet is further increased, the transmission performance of the 0FDM system will continue to decrease.
  • RM Gray complementary coding is only a possible implementation manner, and the remaining method for reducing the PAPR transmission code set can also implement the method provided by this embodiment, only in terms of bit error rate. Slightly different.
  • the binary bit sequence is used to indicate the data sent by the sender.
  • a pre-configured transmission code set for reducing PAPR including one of RM Gray Complementary Code, M-Sequence, and Block Code.
  • This embodiment is a data receiving method corresponding to the data transmitting method provided in Fig. 1, and the technical features in the respective embodiments can be referred to each other.
  • each received OFDM signal is OFDM-demodulated by the receiving end to obtain each OFDM demodulated signal; and the respective OFDM is demodulated by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier.
  • Extracting a signal to obtain a pilot sequence extracting, by using each of the orthogonal subcarriers except the first orthogonal subcarrier, according to the pilot sequence and the OFDM demodulated signal, to obtain a first orthogonal sub
  • Each data symbol carried by each orthogonal subcarrier outside the carrier determining a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using a pre-configured transmission code set for reducing PAPR, for each
  • the data symbols carried by the orthogonal subcarriers are subjected to sequence decoding and constellation demodulation to obtain a binary bit sequence.
  • the transmitting end replaces the data symbols carried by the predetermined first orthogonal subcarriers in each orthogonal subcarrier with the pilot.
  • the sequence so that the receiving end uses the pilot sequence for phase tracking or channel estimation, improves the transmission performance of the OFDM system.
  • Subcarrier transmission data includes:
  • phase inverse rotation on the data symbols carried by the predetermined third orthogonal subcarriers in the respective orthogonal subcarriers according to the predetermined second phase rotation angle, to obtain the data symbols after the second phase inverse rotation; Determining, by the data symbol that is inversely rotated by the second phase, as a data symbol carried by the DC orthogonal subcarrier, deleting a data symbol carried by the third orthogonal subcarrier.
  • the binary bit sequence is used to indicate the data sent by the sender.
  • a pre-configured transmission code set for reducing PAPR including one of RM Gray Complementary Code, M-Sequence, and Block Code.
  • This embodiment is a data receiving method corresponding to the data transmitting method provided in Fig. 2, and the technical features in the respective embodiments can be referred to each other.
  • each received OFDM signal is OFDM-demodulated by the receiving end to obtain each OFDM demodulated signal; and the respective OFDM is demodulated by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier.
  • Extracting a signal to obtain a pilot sequence extracting, by using each of the orthogonal subcarriers except the first orthogonal subcarrier, according to the pilot sequence and the OFDM signal of the OFDM, obtaining a first orthogonal sub-carrier
  • Each data symbol carried by each orthogonal subcarrier outside the carrier determining a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using a pre-configured transmission code set for reducing PAPR, for each
  • the data symbols carried by the orthogonal subcarriers are subjected to sequence decoding and constellation demodulation to obtain a binary bit sequence.
  • the transmitting end replaces the data symbols carried by the predetermined first orthogonal subcarriers in each orthogonal subcarrier with the pilot.
  • the sequence so that the receiving end uses the pilot sequence for phase tracking or channel estimation, improves the transmission performance of the 0FDM system.
  • FIG. 5 is a data transmitting apparatus according to an embodiment of the present invention.
  • the data sending apparatus may be located at a transmitting end of an orthogonal frequency division multiplexing system, where an orthogonal frequency division multiplexing system is used to utilize orthogonal orthogonal lines.
  • the subcarrier transmission data includes: a sequence coding and constellation modulation module 51, a bearer module 52, a replacement module 53, a modulation module 54, and a transmission module 55.
  • a sequence coding and constellation modulation module 51 for utilizing a pre-configured transmission for reducing PAPR Transmitting a code set, performing sequence coding on the received binary bit sequence, and performing constellation modulation to obtain a data symbol; the binary bit sequence is used to indicate data to be transmitted;
  • the first bearer module 52 is connected to the sequence coding and constellation modulation module 51, and is configured to carry the data symbols by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier;
  • the first bearer module 52 is connected to replace the data symbol carried by the predetermined first orthogonal subcarrier in each of the orthogonal subcarriers with a pilot sequence;
  • the modulation module 54 is respectively connected to the first bearer module 52 and the replacement module 53 for performing OFDM modulation on each orthogonal subcarrier carrying the data information to obtain each OFDM signal;
  • the data information includes: the data symbol and the Pilot sequence
  • the transmitting module 55 is connected to the modulation module 54 for transmitting the respective OFDM signals in parallel. Further, the data sending apparatus in this embodiment further includes:
  • the second bearer module is connected to the replacement module 53 for carrying the second orthogonal subcarrier that is idled by the respective orthogonal subcarriers, and carries the data symbol replaced by the pilot sequence.
  • the first rotation module is connected to the second carrier module and the replacement module 53 for performing phase rotation on the data symbol replaced by the pilot sequence according to the predetermined first phase rotation angle, and obtaining the first phase rotation Data symbol.
  • the modulation module 54 is further connected to the first rotation module, and the data information further includes the data symbols after the first phase rotation.
  • the data sending device further includes:
  • the deleting module is connected to the first bearer module 52, and is configured to delete data symbols carried by the DC orthogonal subcarriers in the orthogonal subcarriers.
  • the data sending device further includes:
  • the third bearer module is connected to the deleting module, and is configured to use the third orthogonal subcarrier that is idle in the orthogonal subcarriers to carry the data symbols carried by the DC orthogonal subcarrier.
  • a second rotation module configured to be connected to the third carrier module and the deletion module, configured to perform phase rotation on the data symbols carried by the DC orthogonal subcarriers according to a predetermined second phase rotation angle, to obtain a second phase rotation Data symbol.
  • the modulation module 54 is further connected to the second rotation module, and the data information further includes the data symbols after the second phase rotation.
  • the data sending device further includes:
  • the establishing module is connected to the bearer module 52, configured to pre-establish orthogonal subcarriers of the respective orthogonal subcarriers except for the DC orthogonal subcarriers, and use the preconfigured foregoing to reduce PAPR. Transmitting a code set, performing sequence coding on the received binary bit sequence, and performing correspondence between data symbols obtained by constellation modulation.
  • This embodiment can be used to implement the data transmission methods provided in FIG. 1 and FIG. 2, and the technical features in the embodiments can be referred to each other.
  • the data symbols are carried, and the data subcarriers are obtained, and the first orthogonal subcarriers determined in each orthogonal subcarrier are determined.
  • the carried data symbol is replaced by a pilot sequence, and a pilot subcarrier is obtained.
  • OFDM modulation is performed, and an OFDM signal is sent to the receiving end in parallel, because each orthogonal subcarrier is
  • the data symbols carried by the predetermined first orthogonal subcarriers in the carrier are replaced by pilot sequences, so that the pilot sequences are used for phase tracking or channel estimation, which improves the transmission performance of the OFDM system.
  • FIG. 6 is a data transmitting apparatus according to another embodiment of the present invention.
  • the data transmitting apparatus may be located at a transmitting end of an orthogonal frequency division multiplexing system, where an orthogonal frequency division multiplexing system is used to utilize mutually orthogonal positive
  • the subcarrier transmission data includes: a communication interface 61, a memory 62, and a processor 63.
  • the communication interface 61 is configured to receive a binary bit sequence.
  • the binary bit sequence is used to indicate the data to be sent.
  • the memory 62 is used to store the program.
  • the program can include program code, the program code including computer operating instructions.
  • Memory 62 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.
  • the processor 63 is configured to: use a pre-configured transmission code set for reducing PAPR, perform sequence coding on the received binary bit sequence, and perform constellation modulation to obtain a data symbol;
  • the sequence is used to indicate data to be sent;
  • the data symbols are carried by using orthogonal subcarriers corresponding to the data symbols in each orthogonal subcarrier; and the first positive one of the orthogonal subcarriers is determined in advance
  • the data symbols carried by the subcarriers are replaced by a pilot sequence; OFDM modulation is performed on each orthogonal subcarrier carrying the data information to obtain each OFDM signal; the data information includes: the data symbol and the guide Frequency sequence.
  • the communication interface 61 is also used to transmit each OFDM signal in parallel.
  • the communication interface 61, the memory 62, and the processor 63 may be connected to each other through a bus and complete communication with each other.
  • the bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (abbreviated as EISA) Bus, etc.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 6, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 61, the memory 62, and the processor 63 are integrated on one chip, the communication interface 61, the memory 62, and the processor 63 can complete the same communication through the internal interface.
  • the processor in this embodiment can be used to implement the data transmission methods provided in FIG. 1 and FIG. 2, and the technical features in the embodiments can be referred to each other.
  • the data symbols are carried, and the data subcarriers are obtained, and the first orthogonal subcarriers determined in each orthogonal subcarrier are determined.
  • the carried data symbol is replaced by a pilot sequence, and a pilot subcarrier is obtained.
  • OFDM modulation is performed, and an OFDM signal is sent to the receiving end in parallel, because each orthogonal subcarrier is
  • the data symbols carried by the predetermined first orthogonal subcarriers in the carrier are replaced by pilot sequences, so that the pilot sequences are used for phase tracking or channel estimation, which improves the transmission performance of the OFDM system.
  • FIG. 7 is a data receiving apparatus according to an embodiment of the present invention.
  • the data receiving apparatus may be located at a receiving end of an orthogonal frequency division multiplexing system, where an orthogonal frequency division multiplexing system is used to utilize orthogonal orthogonal lines.
  • the subcarrier transmission data includes: a receiving module 71, a demodulating module 72, a first extracting module 73, a first determining module 74, a second extracting module 75, and a sequence decoding and constellation demodulating module 76.
  • the receiving module 71 is configured to receive each OFDM signal in parallel.
  • the demodulation module 72 is connected to the receiving module 71 for performing OFDM demodulation on the received OFDM signals to obtain respective OFDM demodulated signals.
  • the first extraction module 73 is connected to the demodulation module 72, and is configured to extract, by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier, the demodulation signals of the OFDM signals to obtain a pilot sequence.
  • the first determining module 74 is connected to the first extraction module 73, and is configured to determine a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier.
  • the second extraction module 75 is connected to the demodulation module 72, and is configured to extract, according to the pilot sequence, the OFDM demodulated signals according to the orthogonal subcarriers except the first orthogonal subcarrier, to obtain Data symbols carried by respective orthogonal subcarriers outside the first orthogonal subcarrier.
  • the sequence decoding and constellation demodulation module 76 is connected to the first determining module 74 and the second extracting module 75, respectively, for using the pre-configured transmission code set for reducing the PAPR to carry data on the respective orthogonal subcarriers.
  • the symbol performs sequence decoding and constellation demodulation to obtain a binary bit sequence.
  • the data receiving device further includes:
  • the first rotation module is connected to the second extraction module 75, and is configured to perform phase reversal on the data symbols carried by the predetermined second orthogonal subcarriers in the respective orthogonal subcarriers according to the predetermined first phase rotation angle. Rotate to obtain the data symbol after the first phase is inversely rotated.
  • the second determining module is connected to the first rotating module and the first determining module 74, and is configured to re-determine the data symbol that is inversely rotated by the first phase as a data symbol carried by the first orthogonal subcarrier.
  • the first deleting module is connected to the second extracting module 75, and is configured to delete data symbols carried by the second orthogonal subcarrier.
  • the data receiving device further includes:
  • the third determining module is connected to the second extracting module 75, and is configured to determine that the fixed value or the random value is used as the data symbol carried by the DC orthogonal subcarriers in the orthogonal subcarriers.
  • the data receiving device further includes:
  • the second rotation module is connected to the second extraction module 75, and is configured to perform phase reversal on the data symbols carried by the predetermined third orthogonal subcarriers in the respective orthogonal subcarriers according to the predetermined second phase rotation angle. Rotate to obtain the data symbol after the second phase is inversely rotated.
  • the fourth determining module is connected to the second rotating module and the second extracting module 75, and is configured to determine a data symbol that is inversely rotated by the second phase as a data symbol carried by the DC orthogonal subcarrier.
  • the second deleting module is connected to the second extracting module 75, and is configured to delete data symbols carried by the third orthogonal subcarrier.
  • This embodiment can be used to implement the data receiving method provided in FIG. 3 and FIG. 4, in each embodiment.
  • Technical features can be referenced to each other.
  • each received OFDM signal is OFDM-demodulated by the receiving end to obtain each OFDM demodulated signal; and the respective OFDM is demodulated by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier.
  • Extracting a signal to obtain a pilot sequence extracting, by using each of the orthogonal subcarriers except the first orthogonal subcarrier, according to the pilot sequence and the OFDM demodulated signal, to obtain a first orthogonal sub
  • Each data symbol carried by each orthogonal subcarrier outside the carrier determining a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using a pre-configured transmission code set for reducing PAPR, for each
  • the data symbols carried by the orthogonal subcarriers are subjected to sequence decoding and constellation demodulation to obtain a binary bit sequence.
  • the transmitting end replaces the data symbols carried by the predetermined first orthogonal subcarriers in each orthogonal subcarrier with the pilot.
  • the sequence so that the receiving end uses the pilot sequence for phase tracking or channel estimation, improves the transmission performance of the OFDM system.
  • FIG. 8 is a data receiving apparatus according to another embodiment of the present invention.
  • the data receiving apparatus may be located at a receiving end of an orthogonal frequency division multiplexing system, where an orthogonal frequency division multiplexing system is used to utilize orthogonal
  • the subcarrier transmission data includes: a communication interface 81, a memory 82, and a processor 83.
  • the communication interface 81 is configured to receive each OFDM signal sent by the transmitting end in parallel.
  • the memory 82 is used to store the program.
  • the program can include program code, the program code including computer operating instructions.
  • Memory 62 may include high speed RAM memory and may also include non-volatile memory, such as at least one disk memory.
  • the processor 83 is configured to: perform OFDM demodulation on each received OFDM signal to obtain each OFDM demodulation signal; and use a predetermined first orthogonal subcarrier in each orthogonal subcarrier to Extracting each OFDM demodulated signal to obtain a pilot sequence; determining to use a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using each orthogonal subcarrier except the first orthogonal subcarrier Extracting, according to the pilot sequence and the OFDM demodulation signals, obtaining respective data symbols carried by each orthogonal subcarrier except the first orthogonal subcarrier; using a pre-configured transmission for reducing PAPR
  • the code set performs sequence decoding and constellation demodulation on data symbols carried by each orthogonal subcarrier to obtain a binary bit sequence; the binary bit sequence is used to indicate data sent by the transmitting end.
  • the communication interface 81, the memory 82, and the processor 83 can be connected and completed through a bus. Communication with each other.
  • the bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus, or an Extended Industry Standard Architecture (abbreviated as EISA) Bus, etc.
  • ISA Industry Standard Architecture
  • PCI Peripheral Component
  • EISA Extended Industry Standard Architecture
  • the bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 8, but it does not mean that there is only one bus or one type of bus.
  • the communication interface 81, the memory 82, and the processor 83 are integrated on one chip, the communication interface 81, the memory 82, and the processor 83 can complete the same communication through the internal interface.
  • the processor in this embodiment can be used to implement the data receiving methods provided in FIG. 3 and FIG. 4, and the technical features in the embodiments can be referred to each other.
  • each received OFDM signal is OFDM-demodulated by the receiving end to obtain each OFDM demodulated signal; and the respective OFDM is demodulated by using a predetermined first orthogonal subcarrier in each orthogonal subcarrier.
  • Extracting a signal to obtain a pilot sequence extracting, by using each of the orthogonal subcarriers except the first orthogonal subcarrier, according to the pilot sequence and the OFDM demodulated signal, to obtain a first orthogonal sub
  • Each data symbol carried by each orthogonal subcarrier outside the carrier determining a fixed value or a random value as a data symbol carried by the first orthogonal subcarrier; using a pre-configured transmission code set for reducing PAPR, for each
  • the data symbols carried by the orthogonal subcarriers are subjected to sequence decoding and constellation demodulation to obtain a binary bit sequence.
  • the transmitting end replaces the data symbols carried by the predetermined first orthogonal subcarriers in each orthogonal subcarrier with the pilot.
  • the sequence so that the receiving end uses the pilot sequence for phase tracking or channel estimation, improves the transmission performance of the OFDM system.
  • the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Radio Transmission System (AREA)

Abstract

La présente invention concerne un procédé de transmission de données, un procédé de réception de données et un dispositif. Par utilisation, parmi des sous-porteuses orthogonales à une extrémité émettrice, des sous-porteuses orthogonales qui correspondent à des symboles de données afin qu'elles portent les symboles de données, une sous-porteuse de données est acquise. En remplaçant par une séquence pilote le symbole de données porté par une première sous-porteuse orthogonale parmi les sous-porteuses orthogonales, une sous-porteuse pilote est acquise. Lorsqu'une modulation OFDM est effectuée sur la base de la sous-porteuse de données et de la sous-porteuse pilote, une transmission en parallèle à une extrémité réceptrice et une réception correspondante à l'extrémité réceptrice sont effectuées. Comme le symbole de données porté par une première sous-porteuse orthogonale, parmi les sous-porteuses orthogonales, est remplacé par une séquence pilote, et comme la séquence pilote est utilisée pour la poursuite de phase ou l'estimation de canal, les performances de transmission d'un système OFDM sont améliorées. Cela remédie au problème technique posé par la qualité de transmission médiocre due à une augmentation du taux d'erreur provoquée par un procédé de réduction du PAPR par codage de séquence.
PCT/CN2013/082775 2013-09-02 2013-09-02 Procédé de transmission de données, procédé de réception de données et dispositif WO2015027514A1 (fr)

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