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EP-3565206-B1 - INFORMATION TRANSMISSION METHOD FOR REDUCING PAPR, SENDING END AND RECEIVING END

EP3565206B1EP 3565206 B1EP3565206 B1EP 3565206B1EP-3565206-B1

Inventors

  • SHEN, XIAODONG

Dates

Publication Date
20260513
Application Date
20171218

Claims (10)

  1. An information transmission method for reducing Peak to Average Power Ratio, PAPR, performed by a transmitting terminal, comprising: scrambling (101) an initial data block according to a predetermined scrambling mode to obtain a scrambled target data block; determining (102) a scrambling mode index corresponding to the predetermined scrambling mode according to a predetermined relation between scrambling mode indexes and scrambling modes; generating (103) side information carrying the determined scrambling mode index based on the scrambling mode index; and transmitting (104) the side information and the target data block to a receiving terminal, wherein the side information carries a phase rotation sequence index, characterized in that , the scrambling (101) the initial data block according to the predetermined scrambling mode to obtain the scrambled target data block comprises: dividing the initial data block into V data sub-blocks, wherein each of the data sub-blocks corresponds to W different phase rotations, and both V and W are positive integers; determining one phase rotation for each of the data sub-blocks from the W different phase rotations to obtain a phase rotation sequence of the initial data block; and obtaining the target data block by scrambling the initial data block based on the phase rotation sequence of the initial data block; wherein the determining (102) the scrambling mode index corresponding to the predetermined scrambling mode according to the predetermined relation between scrambling mode indexes and scrambling modes comprises: determining the phase rotation sequence index corresponding to a phase rotation sequence of the target data block according to a predetermined relation between phase rotation sequence indexes and phase rotation sequences; and, wherein the generating (103) side information carrying the determined scrambling mode index based on the scrambling mode index comprises: obtaining (203) the side information carrying the determined scrambling mode index by encoding the determined scrambling mode index.
  2. The information transmission method for reducing PAPR according to claim 1, wherein before scrambling (101) the initial data block according to the predetermined scrambling mode to obtain the scrambled target data block, the method further comprises: obtaining the initial data block by encoding a data block.
  3. The information transmission method for reducing PAPR according to claim 1, wherein the transmitting (104) the side information and the target data block to the receiving terminal comprises: performing (204) resource mapping on the side information and the target data block in a predetermined time-frequency resource mapping manner; and transmitting (205) the side information and the target data block subjected to the resource mapping to the receiving terminal.
  4. An information reception method for reducing Peak to Average Power Ratio, PAPR, performed by a receiving terminal, comprising: obtaining (601) side information and a target data block transmitted by a transmitting terminal, wherein the target data block is obtained by the transmitting terminal through scrambling an initial data block according to a predetermined scrambling mode, and the side information carries a scrambling mode index corresponding to the predetermined scrambling mode; and determining (602) a scrambling mode corresponding to the scrambling mode index carried in the side information according to a predetermined relation between scrambling mode indexes and scrambling modes, characterized in that , the method further comprises: descrambling (603) the target data block according to the determined scrambling mode to obtain the initial data block, wherein, the target data block is obtained by the transmitting terminal through dividing the initial data block into V data sub-blocks, determining one phase rotation for each of the data sub-blocks from the W different phase rotations to obtain a phase rotation sequence of the initial data block, and scrambling the initial data block based on the phase rotation sequence of the initial data block, wherein each of the data sub-blocks corresponds to W different phase rotations, and both V and W are positive integers; wherein, the determining (602) the scrambling mode corresponding to the scrambling mode index carried in the side information according to the predetermined relation between scrambling mode indexes and scrambling modes comprises: determining a phase rotation sequence corresponding to a phase rotation sequence index carried in the side information according to a predetermined relation between phase rotation sequence indexes and phase rotation sequences; and, wherein after the descrambling the target data block according to the determined scrambling mode to obtain the initial data block, the method further comprises: obtaining a data block by decoding the initial data block, wherein the initial data block is obtained by the transmitting terminal through encoding the data block.
  5. The information transmission method for reducing PAPR according to claim 4, wherein the obtaining (601) the side information transmitted by the transmitting terminal comprises: obtaining the side information from two sub-bands adjacent to the target data block in a predetermined time-frequency resource mapping manner, wherein the predetermined time-frequency resource mapping manner comprises mapping the side information to the two sub-bands adjacent to the target data block; and/or wherein before the determining (602) the scrambling mode corresponding to the scrambling mode index carried in the side information according to the predetermined relation between scrambling mode indexes and scrambling modes, the method further comprises: obtaining the scrambling mode index carried in the side information by decoding the side information.
  6. A transmitting terminal, comprising: a scrambling module (701), configured to scramble an initial data block according to a predetermined scrambling mode to obtain a scrambled target data block; a first determination module (702), configured to determine a scrambling mode index corresponding to the predetermined scrambling mode according to a predetermined relation between scrambling mode indexes and scrambling modes; a generation module (703), configured to generate side information carrying the determined scrambling mode index based on the scrambling mode index; and a transmitting module (704), configured to transmit the side information and the target data block to a receiving terminal, wherein the side information carries the phase rotation sequence index, characterized in that , the scrambling module (701) comprises: a dividing sub-module (7011) configured to divide the initial data block into V data sub-blocks, wherein each of the data sub-blocks corresponds to W different phase rotations, and both V and W are positive integers; a first determination sub-module (7012) configured to determine one phase rotation for each of the data sub-blocks from the W different phase rotations to obtain a phase rotation sequence of the initial data block; and a scrambling sub-module (7013) configured to obtain the target data block by scrambling the initial data block based on the phase rotation sequence of the initial data block; wherein the first determination module (702) is specifically configured to determine a phase rotation sequence index corresponding to a phase rotation sequence of the target data block according to a predetermined relation between phase rotation sequence indexes and phase rotation sequences; and, wherein the generation module (703) is specifically configured to obtain the side information carrying the determined scrambling mode index by encoding the determined scrambling mode index.
  7. The transmitting terminal according to claim 6, further comprising: an encoding module (705), configured to obtain the initial data block by encoding a data block.
  8. The transmitting terminal according to claim 6, wherein the transmitting module (704) comprises: a mapping sub-module (7041), configured to perform resource mapping on the side information and the target data block in a predetermined time-frequency resource mapping manner; and a transmitting sub-module (7042), configured to transmit the side information and the target data block subjected to the resource mapping to the receiving terminal; and wherein the mapping sub-module (7041) is specifically configured to map the side information to two sub-bands adjacent to the target data block.
  9. A receiving terminal, comprising: an obtaining module (1101), configured to obtain side information and a target data block transmitted by a transmitting terminal, wherein the target data block is obtained by the transmitting terminal through scrambling an initial data block according to a predetermined scrambling mode, and the side information carries a scrambling mode index corresponding to the predetermined scrambling mode; and a second determination module (1102), configured to determine a scrambling mode corresponding to the scrambling mode index carried in the side information according to a predetermined relation between scrambling mode indexes and scrambling modes, characterized in that , the receiving terminal further comprises: a processing module (1103), configured to descramble the target data block according to the determined scrambling mode to obtain the initial data block, wherein, the target data block is obtained by the transmitting terminal through dividing the initial data block into V data sub-blocks, determining one phase rotation for each of the data sub-blocks from the W different phase rotations to obtain a phase rotation sequence of the initial data block, and scrambling the initial data block based on the phase rotation sequence of the initial data block, wherein each of the data sub-blocks corresponds to W different phase rotations, and both V and W are positive integers; wherein the second determination module (1102) is specifically configured to determine a phase rotation sequence corresponding to a phase rotation sequence index carried in the side information according to a predetermined relation between phase rotation sequence indexes and phase rotation sequences; and, wherein the receiving terminal further comprises: a second decoding module (1105), configured to obtain a data block by decoding the initial data block, wherein the initial data block is obtained by the transmitting terminal through encoding the data block.
  10. The receiving terminal according to claim 9, wherein the obtaining module (1101) is specifically configured to obtain the side information from two sub-bands adjacent to the target data block in a predetermined time-frequency resource mapping manner, wherein the predetermined time-frequency resource mapping manner comprises mapping the side information to the two sub-bands adjacent to the target data block; and/or the receiving terminal further comprises: a first decoding module 1104), configured to obtain the scrambling mode index carried in the side information by decoding the side information.

Description

TECHNICAL FIELD The present disclosure relates to the field of communication technology, and in particular to an information transmission method for reducing PAPR, a transmitting terminal and a receiving terminal. BACKGROUND Orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) is a multi-carrier modulation (Multi-Carrier Modulation, MCM) technology, and a core idea thereof is dividing a channel into multiple orthogonal subchannels and performing narrowband modulation and transmission in individual subchannels, which reduces interference between or among the subchannels. A signal bandwidth of each subchannel is narrower than a coherence bandwidth of the channel, and therefore, frequency selective fading of each subchannel is flat, significantly eliminating inter-symbol interference. In addition, as carriers of the subchannels in an OFDM system are orthogonal with each other, frequency spectrums thereof are overlapped with each other, which not only reduces interferences between or among subcarriers but also improves utilization ratios of the frequency spectrums. The orthogonal modulation and demodulation in the subchannels can be performed through inverse fast Fourier transform (Inverse Fast Fourier Transform, IFFT) and fast Fourier transform (Fast Fourier Transform, FFT). The OFDM system can provide wider coverage, better transmission quality, and higher data rate and spectral efficiency. Notwithstanding, as an OFDM symbol is formed by superimposing multiple independently-modulated subcarrier signals, the superimposed signal is subjected to modulation of a same initial phase signal in a case that phases of the subcarriers are identical or close to each other, which results in a large instantaneous peak power and thereby a large peak to average power ratio (Peak to Average Power Ratio, PAPR). As a dynamic range of an ordinary power amplifier is limited, a multi-input and multi-output orthogonal frequency division multiplexing (MIMO-OFDM) signal with a large PAPR is easily subjected to a nonlinear region of the power amplifier, causing nonlinear distortion to the signal, resulting in noticeable spectral spread interference and intraband signal distortion and degrading performance of the whole system. High PAPR has become a main technical obstacle against OFDM. The method for reducing PAPR in related art mainly includes selective mapping (selective mapping, SLM) and partial transmit sequence (Partial Transmit Sequence, PTS), but in the two methods above, it is difficult for a transmitting terminal to transmit side information carrying scrambled information to a receiving terminal reliably. Prior art document D1 (CN103391171 B) discloses an improved selective mapping (SLM) and peak-to-average-power-ratio (PAPR) suppression method based on decision feedback. The method comprises: multiplying to-be-transmitted data with a plurality of scrambling phase sequences to obtain a plurality of candidate OFDM symbols, performing quick Fourier transform on the candidate OFDM symbols, selecting a symbol with the minimal PAPR value as a transmission symbol, and adding a pilot frequency at a starting position of the to-be-transmitted data to estimate channel frequency-domain response when receiving feedback. Prior art document D2 (WO2006060651) discloses a method of transmitting a signal, which includes: transmitting an OFDM sequence for an MIMO scheme in which polyphase sequences of at least some sub-blocks of the OFDM sequence have been interleaved and inverted so as to reduce PAPR. Prior art document D3 (JAYALATH A.D.S. ET AL: "Peak-to-average power ratio reduction of an OFDM signal using data permutation with embedded side information" CONFERENCE PROCEEDINGS/ISCAS 2001, THE 2001 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS: 06-09 MAY 2001) disclose the use of data permutation with embedded side information (SI) to reduce the PAR of an OFDM signal. SI is coded using a simple forwarderror-correction code and inserted into the information sequence. The PARs of the permuted sequences and the original information sequence are then computed using IDFTs. The prior art document D7 (EP1953981 A1) discloses sending a data block with reduced PAPR in an OFDM communication scheme. SUMMARY An information transmission method for reducing PAPR, a transmitting terminal and a receiving terminal are provided in the accompanying claims, to solve a problem in a method for reducing PAPR in related art that it is difficult for a transmitting terminal to transmit side information carrying scrambled information to a receiving terminal reliably. BRIEF DESCRIPTION OF THE DRAWINGS In order to better clarify the technical solutions according to embodiments of the present disclosure, the appended drawings involved in the description of the following embodiments are briefly introduced hereinafter. Apparently, the drawings only illustrate some embodiments of the present disclosure, and other drawings may