WO2015109576A1 - 数据传输方法、装置和系统 - Google Patents
数据传输方法、装置和系统 Download PDFInfo
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- WO2015109576A1 WO2015109576A1 PCT/CN2014/071504 CN2014071504W WO2015109576A1 WO 2015109576 A1 WO2015109576 A1 WO 2015109576A1 CN 2014071504 W CN2014071504 W CN 2014071504W WO 2015109576 A1 WO2015109576 A1 WO 2015109576A1
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 96
- 238000000034 method Methods 0.000 title claims abstract description 76
- 239000000969 carrier Substances 0.000 claims abstract description 217
- 238000013507 mapping Methods 0.000 claims abstract description 25
- 238000012545 processing Methods 0.000 claims abstract description 22
- 230000007480 spreading Effects 0.000 claims abstract description 18
- 238000001228 spectrum Methods 0.000 claims abstract description 15
- 238000004891 communication Methods 0.000 claims abstract description 13
- 125000004122 cyclic group Chemical group 0.000 claims description 49
- 108010003272 Hyaluronate lyase Proteins 0.000 claims description 44
- 230000008569 process Effects 0.000 claims description 34
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 230000008707 rearrangement Effects 0.000 claims description 7
- 238000007781 pre-processing Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 17
- 238000010586 diagram Methods 0.000 description 16
- 230000003111 delayed effect Effects 0.000 description 5
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- 238000003775 Density Functional Theory Methods 0.000 description 1
- 108010076504 Protein Sorting Signals Proteins 0.000 description 1
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Classifications
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2634—Inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators in combination with other circuits for modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03828—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties
- H04L25/03866—Arrangements for spectral shaping; Arrangements for providing signals with specified spectral properties using scrambling
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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
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
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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
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2644—Modulators with oversampling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0016—Time-frequency-code
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0042—Arrangements for allocating sub-channels of the transmission path intra-user or intra-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0092—Indication of how the channel is divided
Definitions
- the present invention relates to communication technologies, and in particular, to a data transmission method, apparatus, and system.
- Background Art In a wireless communication system, in order to enable simultaneous access by multiple users, multiple access technology is required. Commonly used multiple access technologies include: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), etc. Among them, CDMA-based Wide Code Division Multiple Access (WCDMA) technology and FDMA-based Orthogonal Frequency Division Multiple Access (OFDMA) technology are respectively third. Generation and fourth generation communication networks are adopted.
- CDMA Code Division Multiple Access
- FDMA Frequency Division Multiple Access
- TDMA Time Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- Embodiments of the present invention provide a data transmission method, apparatus, and system to solve the problem of carrier frequency offset sensitivity, thereby improving the reliability of the communication system.
- an embodiment of the present invention provides a data transmission method, including:
- M is an integer greater than 1
- the carrier spacing of the M carriers is greater than or equal to a data rate, and the carrier spacing is a center of two carriers The spacing between frequency points;
- the mapping the modulated data to the at least one carrier of the M carriers includes:
- Data is allocated to at least one of the M carriers.
- the allocating data to the at least one carrier of the M carriers includes:
- the performing the multi-carrier modulation on the data after the spreading, scrambling, and pre-coding processing includes:
- the signal after the cyclic delay is expanded is filtered, the K-point is added in stages, and the serial-to-serial conversion is performed.
- the cyclic delay extended signal is ⁇ ! ! -!
- the carrier number M satisfies the following condition: M ⁇ 2 P , p is an integer greater than 1, and the complement number is a virtual carrier such that the carrier total
- the oversampling factor K is 36 and the total bandwidth is 4.86MHz.
- an embodiment of the present invention provides a data transmission method, including:
- the receiving port receives, by the receiving port, the multi-carrier modulated signal sent by the sending device, where the number of carriers is M, M is an integer greater than 1, and the carrier spacing of the M carriers is greater than or equal to a data rate, where the carrier spacing is The spacing between the center frequencies of the two carriers;
- the multi-carrier demodulation includes: The multi-carrier modulated signal is cyclically delayed and subjected to discrete Fourier transform followed by DFT output.
- the multi-carrier modulated signal is cyclically delayed extended, and a discrete Fourier transform and a DFT output are performed.
- the memory is used to store the initial signal, and the signal in the memory is filtered, the M-point segmentation phase port, the rearrangement, and the M-point DFT transform are output;
- the memory reads N the received signals, discards the oldest N signals, filters the signals in the memory, adds M points, rearranges, and performs M-point DFT conversion, and outputs until the reading is completed. All received signals;
- the length of the memory is the length of the prototype filter, and N is a downsampling factor.
- the value of N is the same as the value of the oversampling factor K used by the transmitting device for multi-carrier modulation. K and N are greater than 0. The integer.
- the sending rate of the multi-carrier modulated signal is a data transmission rate, where the data transmission rate meets the following conditions:
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X number of code bits P X bits per symbol Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- B/R 5/4
- m l
- carrier chip rate is 240 kHz
- carrier bandwidth is 300 kHz
- number of carriers M is 16
- oversampling factor K is 20, and the total bandwidth is 4.8 MHz.
- the value of m may not be 1.
- the value of m may not be 1.
- the carrier number M satisfies the following condition: M ⁇ 2 P , p is an integer greater than 1, and the supplementary quantity is a virtual load Wave makes the total number of carriers
- the oversampling factor K is 36 and the total bandwidth is 4.86MHz.
- an embodiment of the present invention provides a sending apparatus, including:
- a coded modulation module for encoding and modulating data
- mapping module configured to map the modulated data to at least one of the M carriers, where M is an integer greater than 1, and a carrier spacing of the M carriers is greater than or equal to a data rate, where the carrier spacing is The spacing between the center frequencies of the two carriers;
- a spreading and pre-processing module for performing spreading, scrambling and precoding processing on the sub-data mapped to each carrier
- a multi-carrier modulation module configured to map the data after the spreading, scrambling, and pre-coding processing to a transmitting port, and perform multi-carrier modulation
- a sending module configured to send the multi-carrier modulated data to the receiving device.
- the mapping module is specifically configured to: divide the system bandwidth into M consecutive carrier bandwidths;
- Data is allocated to at least one of the M carriers.
- mapping module is specifically configured to:
- the multi-carrier modulation module is specifically configured to: convert, by using an inverse discrete Fourier transform (IDFT) of the M carriers to a time domain signal by using an inverse Fourier transform of the M points, Where M is an integer greater than 2;
- IDFT inverse discrete Fourier transform
- the signal after the cyclic delay is expanded is filtered, the K-point is added in stages, and the serial-to-serial conversion is performed.
- the cyclic delay extended signal is ⁇ ! ! -!
- the carrier number M satisfies the following condition: M ⁇ 2 P , p is an integer greater than 1, and the number of introduced virtual loads is Wave makes the total number of carriers
- an embodiment of the present invention provides a receiving apparatus, including:
- a receiving module configured to receive, by using a receiving port, a multi-carrier modulated signal sent by a sending device, where the number of carriers is M, M is an integer greater than 1, and a carrier spacing of the M carriers is greater than or equal to a data rate,
- the carrier spacing is a spacing between center frequency points of two carriers;
- a multi-carrier demodulation module configured to perform multi-carrier demodulation on the signal;
- a decoding module configured to perform despreading, descrambling, demodulating, and decoding operations on the multi-carrier demodulated signal to obtain target data.
- the multi-carrier demodulation module is specifically configured to: perform cyclic delay extension on the multi-carrier modulated signal, and perform a discrete Fourier transform DFT output.
- the multi-carrier demodulation module includes a memory, where the multi-carrier demodulation module is specifically configured to:
- the memory is used to store the initial signal, and the signal in the memory is filtered, the M-point segmentation phase port, the rearrangement, and the M-point DFT transform are output;
- the memory is read into the N received signals, the oldest N signals are discarded, filtered, M-point segmented addition, rearrangement, M-point DFT conversion is performed, and the data is read until all times are read;
- the length of the memory is the length of the prototype filter
- N is a downsampling factor
- N The value is the same as the value of the oversampling factor ⁇ used by the transmitting device for multi-carrier modulation
- K and N are integers greater than zero.
- K/M mX (B/R), m is an integer greater than 0, where the carrier chip rate R is the chip-level rate at which data is transmitted on each carrier.
- B/R 5/4
- m l
- carrier chip rate is 240 kHz
- carrier bandwidth is 300 kHz
- number of carriers M is 16
- oversampling factor K is 20, and the total bandwidth is 4.8 MHz.
- the value of m may not be 1.
- the value of m may not be 1.
- the carrier number M satisfies the following condition: M ⁇ 2 P , p is an integer greater than 1, and a virtual carrier of the number Mi is introduced Total number of carriers
- any one of the first to the seventh possible implementation manners of the fourth aspect, in the eighth possible implementation manner, the bandwidth of each of the carriers is B KHz, and B is greater than Any number of 0, the system occupied bandwidth W the number of bandwidth BX carriers M per each carrier.
- the seventh possible implementation manner of the fourth aspect in a ninth possible implementation manner,
- the oversampling factor K is 36 and the total bandwidth is 4.86MHz.
- an embodiment of the present invention provides a communication system, including: the sending apparatus according to the embodiment shown in FIG. 9 and the receiving apparatus according to the embodiment shown in FIG.
- an embodiment of the present invention provides a data processing method, including: encoding and modulating data; mapping the modulated data to at least one of M carriers, where M is an integer greater than 1.
- the carrier spacing of the M carriers is greater than or equal to a data rate, and the carrier spacing is a spacing between center frequency points of two carriers; performing spreading, scrambling, and precoding processing on data mapped to each carrier .
- the mapping the modulated data to the at least one carrier of the M carriers comprises: dividing the system bandwidth into M consecutive carrier bandwidths; Data is allocated to at least one of the M carriers.
- the assigning data to the at least one carrier of the M carriers includes: allocating data to the M At least two consecutive carriers of a carrier bandwidth; or, data is allocated to at least two non-contiguous carriers, and when the number of the non-contiguous carriers is greater than two, the carrier spacing is equal.
- an embodiment of the present invention provides a data multi-carrier modulation method, including: converting, by using an inverse discrete Fourier transform IDFT of an M-point signal into an M-point, a time-domain signal, where M is greater than 2. Integer; cyclically delaying the IDFT-transformed time domain signal; filtering the cyclically delayed signal, K-point segment addition, and parallel-to-serial conversion, where K is the cyclic delay expansion process Oversampling factor.
- i is an integer greater than 0.
- x mod(nK+1 , M) is the signal on the mod(nK+i, M) carrier
- mod(nK+i, M) represents the nK+i pair M modulo
- K is the oversampling factor
- n represents the latest moment of the signal processed by this cyclic delay spread
- n is an integer greater than
- u is an integer
- 0 u L f /Kl each cyclic delay spread processing Lf/K group signals, each group of signals including M data.
- the oversampling factor K is 36 and the total bandwidth is 4.86MHz.
- an embodiment of the present invention provides a data multi-carrier demodulation method, including: storing, by using a memory, an initial signal, filtering a signal in the memory, adding, rearranging, and rearranging, M-point DFT transform After the output, the memory reads N of the received signals, discards the oldest N signals, filters the signals in the memory, adds M points, rearranges, and outputs M points and DFTs. Until all the received signals are read; wherein the length of the memory is the length of the prototype filter, N is the downsampling factor, and the value of N and the oversampling factor K used by the transmitting device for the multicarrier modulation process are taken The values are the same, K and N are integers greater than zero.
- the oversampling factor K is 36 and the total bandwidth is 4.86MHz.
- the data transmission method, apparatus and system provided by the embodiment of the invention, by transmitting, by the transmitting device, the modulated data to at least one carrier, and after performing spreading, scrambling and precoding processing, the data is After the multi-carrier modulation is performed on the transmitting port, since the carrier spacing between the carriers is not less than the data rate, the orthogonality between the carriers is not required in the existing OFDM technology, and the carrier frequency offset is reduced. Impact. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.
- Embodiment 1 is a flowchart of Embodiment 1 of a data transmission method according to the present invention
- FIG. 2 is a schematic diagram corresponding to the embodiment of the data transmission method shown in FIG. 1;
- Figure 3 is a schematic diagram of a multi-carrier modulation process
- FIG. 5 is a schematic diagram of a spectrum distribution of multiple carriers
- Embodiment 6 is a flowchart of Embodiment 2 of a data transmission method according to the present invention.
- Figure 7 is a schematic diagram of a multi-carrier demodulation process
- FIG. 10 is a schematic structural diagram of Embodiment 1 of a receiving apparatus according to the present invention.
- FIG. 11 is a schematic structural diagram of Embodiment 1 of a communication system according to the present invention.
- the technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention.
- the embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.
- the transmitting device may also be referred to as a transmitter, and the receiving device may also be referred to as a receiver.
- the transmitter may be a base station, the receiver is a terminal; or the transmitter is a terminal, and the receiver is a base station.
- a base station or terminal it can be either a transmitter or a receiver.
- the role played at a certain time depends on the direction in which the data is sent at that time.
- FIG. 1 is a flowchart of Embodiment 1 of a data transmission method according to the present invention. As shown in FIG. 1, the method in this embodiment may include:
- Step 101 The transmitting device encodes and modulates the data.
- Step 102 The transmitting device maps the modulated data to M carriers, where M is an integer greater than 1, and a carrier spacing of the M carriers is greater than or equal to a data rate.
- Step 103 The transmitting device performs spreading, scrambling, and precoding processing on data mapped to each carrier.
- Step 104 The transmitting device performs multi-carrier modulation on the data after the spreading, scrambling, and pre-coding processing.
- Step 105 The transmitting device sends the multi-carrier modulated data to a receiving device.
- the transmitting device encodes and modulates the transport block; then, in step 102, subcarrier mapping is performed on the data stream, and then, in steps 103 and 104, the substream is mapped to each carrier. Perform spread spectrum, scrambling, and precoding processing, and perform multi-carrier modulation. If there are MIMO operations, that is, the number of the transmitting ports is multiple, or there are multiple antennas, then step 103 needs to perform precoding processing, that is, mapping the data signals to multiple transmitting ports (or antennas), and finally, In step 105, the multi-carrier modulated data is transmitted to a receiving device.
- control information corresponding to the data may be notified to the receiving device through other channels such as an additional carrier, or the control information may be directly transmitted to the receiver together with the data information.
- the receiver needs to feed back channel state information (CSI) and Hybrid Automatic Repeat Request (HARQ) acknowledgement (ACK) information.
- control information may be carried on the primary carrier to indicate which secondary carriers transmit data, and information such as code channel usage, modulation, and retransmission process of the data on each carrier may also be indicated.
- a secondary carrier that is, a carrier of small bandwidth, can be used to transmit data information and/or partial control information.
- the data transmission process in this embodiment mainly includes: coding, modulation, carrier mapping, spread spectrum, scrambling, precoding, and more Carrier modulation and the steps sent to the receiver over the corresponding channel.
- Some processes in the schematic diagram may be interchanged. For example, spread spectrum, scrambling may be performed first, and then multi-carrier mapping may be performed; or, multi-carrier mapping may be performed after encoding, and then modulated, spread, and scrambled on each carrier. Wait for the operation.
- each time one or more data blocks are transmitted in the transmitting device the coding and modulation processes of the downlink transmission channel or the physical channel are first coded and modulated, and the sub-carrier mapping is performed on the data block.
- the coding can be 1/3 Turbo coding
- the modulation method can be QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), 64QAM (64 Quadrature Amplitude Modulation) or other order modulation.
- the transmitting device may transmit data of multiple different receiving devices by multiple carriers, or may transmit data to different receiving devices at different times on the same carrier.
- mapping the modulated data to M carriers may be performed: in a carrier mapping process, first dividing a system bandwidth into a plurality of consecutive carrier bandwidths, and then allocating data to the At least one of the M carriers.
- data may be allocated to a plurality of consecutive carriers of the M carrier bandwidths, or data may be allocated to at least two non-contiguous carriers.
- the carrier spacing is equal.
- the system bandwidth is divided into numbers 1, 2, 3, 4,
- the data can be allocated to 1, 2, 3 three consecutive carriers, or the data can be divided into 1, 3, 5 three equally spaced carriers.
- the multi-carrier modulation in step 104 may include:
- the signal on the M carriers ⁇ X. (n), ⁇ ⁇ ), ⁇ , X M-1 (n) ⁇
- the Inverse Discrete Fourier Transform (IDFT) transforms into a time domain signal ⁇ x. (n), Xl (n), ⁇ ⁇ , x M- i(n) ⁇ , where M is an integer greater than 2; the IDFT-converted data is subjected to a cyclic delay spread operation, the cyclic delay
- the expanded signal is ⁇ a.
- n represents the latest time of the data of this cyclic delay spread operation
- u is an integer
- L f is the filter length
- mod(nK +i, M) means that nK+i modulo M
- K is an oversampling factor (or called upsampling, the sampling rate is greater than the original signal, the essence is interpolation, K refers to this sampling frequency);
- the cyclic delay extended operation in the multi-carrier modulation process may include: Step 1: storing, by using a memory, initial data of a continuous time, the length of time is L f /K, and the data length of each time is M, the initial state of the memory A value of 0, set a position pointer p, the initial value is 0;
- Step 2 The memory sequentially moves M data (the M data corresponds to the data amount at one time). The oldest time data is discarded, and the new data ⁇ x at a time is read. (n), Xl (n), ..., XM ⁇ n) ⁇ ; Then read L f data from the memory and output, the time sequence of the data output in the memory is n, lj, n-1, n -2 hours, ⁇ ⁇ , nL f /K+l, K times data is read every time.
- the output order of the data is the position pointer p as the starting position, and the K data output is cyclically read.
- the K-point segment addition may include:
- the filtered data is grouped, and each K data is divided into one group, and the data at the same position of the Lf/K group is added to obtain a set of data of length K.
- IDFT is the inverse of Discrete Fourier Transform (DFT).
- IDFT and DFT are a kind of transformation between "signal" with time as the independent variable and “spectral” function with frequency as the independent variable. relationship.
- the arrangement rule of the filter satisfies the complete prototype filter coefficient, that is, satisfies X lcm(M, K), where L f is the filter length, a is a natural number, and lcm (M, K) represents the least common multiple of M and K.
- the input signal at a certain time is ⁇ X 0 ( n:>, xl(n), x2(n), x3(n) ⁇
- the length of the memory is 4
- the receiving device needs to perform the inverse operation of the above-mentioned transmitting process on the signal, including the receiving device performing multi-carrier demodulation on the data stream, and then despreading/descrambling, demodulating and translating the data stream. Code operation.
- the specific process will be described in the following embodiments corresponding to data reception.
- the transmitting device maps the modulated data to multiple carriers during data transmission, and after performing spreading, scrambling, and precoding processing, the data is transmitted after multi-carrier modulation on the transmitting port. Since the carrier spacing between the carriers is not less than the data rate, the orthogonality between the carriers is not required in the existing OFDM technology, and the influence of the carrier frequency offset on the system performance is reduced.
- the OFDM technology of the prior art is very sensitive to the phase and the carrier frequency offset, and the orthogonality between the carriers is very strict.
- the embodiment of the present invention provides a new data transmission method, and simultaneously solves the OFDM intermediate frequency offset. Sensitive issues to facilitate the smooth evolution of third-generation communication networks to fourth-generation communication networks.
- the above embodiment is capable of multiplexing WCDMA technology and using narrowband for data transmission.
- each carrier can select a bandwidth with a smaller granularity, and more different total bandwidths can be combined by selecting the number of carriers, thereby enabling more flexible use of carrier resources and improving The efficiency of data transmission, rather than limiting the bandwidth of each carrier to 5 MHz as in the existing WCDMA technology, the total bandwidth can only be a multiple of 5 MHz or 5 MHz.
- the main parameters involved include carrier chip rate R, Wave bandwidth (carrier spacing) B, number of subcarriers M,
- Figure 5 is a schematic diagram of the spectrum distribution of multiple carriers. Among them, the following parameters have the following relationship:
- Total system bandwidth number of subcarriers M X Carrier bandwidth 8.
- K/M mX (B/R), m is a positive integer.
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X number of channels P X bits per symbol Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- the parameters in Table 1 above indicate that the transmission block is encoded and modulated on the bandwidth of 5 , and then the subcarriers are mapped into 16 subcarriers, and the bandwidth occupied by each subcarrier is 300 ⁇ , and the chip rate is 240 Kbps. If there is MIMO operation, the data stream on each carrier is precoded, and finally the 16 carriers are multi-carrier modulated, that is, 16 carriers are oversampled (oversampling factor K is 20), 16-point IDFT conversion, and then After the process of cyclic delay spread is multiplied by the filter coefficients, the last K points are added in stages, and then converted in parallel and output.
- the ratio of the carrier bandwidth B to the carrier chip rate R may not be equal to
- the value of m is all 1, but in actual implementation The value of m may not be 1, that is, K/M may be several times of B/R.
- the relationship between the parameters is as follows:
- Total system bandwidth number of carriers M X Carrier bandwidth 8.
- Data transmission rate carrier chip rate rate RX carrier number M/data spreading factor SFX code channel number PX per symbol bit number Bits, where data spreading factor SF is the ratio of symbol rate to chip rate.
- the parameter configuration can be as shown in Table 3:
- the total bandwidth is 6M, and its parameter configuration can be as shown in Table 4:
- FIG. 6 is a flowchart of Embodiment 2 of the data transmission method of the present invention. As shown in FIG. 6, the method in this embodiment may include:
- Step 601 The receiving device receives, by using a receiving port, a multi-carrier modulated signal sent by the sending device, where the number of carriers is M, M is an integer greater than 1, and a carrier spacing of the M carriers is greater than or equal to a data rate.
- the carrier spacing is the spacing between the center frequency points of the two carriers.
- Step 602 The receiving device performs multi-carrier demodulation on the signal.
- the step 602 may be: the receiving device performs cyclic delay extension on the multi-carrier modulated signal, and performs discrete Fourier transform and then DFT output.
- Step 603 The receiving apparatus performs despreading, descrambling, demodulating, and decoding operations on the multi-carrier demodulated signal to obtain target data.
- the signal needs to be reversed in the transmitter.
- the receiver performs multi-carrier demodulation on the data stream, and then despreads, descrambles, demodulates and decodes the data stream.
- FIG. 7 is a schematic diagram of a multi-carrier demodulation process. As shown in FIG. 7, the multi-carrier demodulation process may specifically include:
- the memory stores one continuous period of time with the initial signal, which is the memory length of the prototype filter lengths L f, the signal is filtered in the memory, and then adding M-point segment, the last point of the segment after adding M The data is rearranged and the M-point DFT transform is output. After filtering, the memory sequentially moves N data to discard the oldest time data, reads in new data, and then performs the above process, and so on. Where N is the downsampling factor and N is an integer greater than zero.
- the addition of the M points can specifically include:
- the filtered data is grouped, and each group has M data, and the data at the same position of the Lf/M group is added to obtain a set of data of length M.
- Rearrangement can specifically include:
- Each group of data of the M point segment addition output is subjected to position adjustment, and the data obtained by the M point segment addition before adjustment is ⁇ w. (u:>, Wl (u), ⁇ ⁇ ⁇ ⁇ ⁇ ⁇ , WM ⁇ U) ⁇ some sort, u is the sample moment,
- Wl (u) represents the i-th data at time u.
- the specific output order is related to the reading order of the delay line data.
- the z-sequence performs M-point segmentation, that is, the z-sequence is divided into five groups, each group of four data, and the data of the corresponding positions of the five sub-sequences are added, and the obtained signal w-sequence is read according to the direction of the arrow in FIG.
- Data, w sequence data order is ⁇ w. , w 3 , w 2 , Wl ⁇ .
- the sequence is rearranged and the DFT transform of the M point.
- multi-carrier demodulation is performed, and the multi-carrier demodulated signal is despread, descrambled, demodulated, and decoded. Operation, get the target data. Since the carrier spacing between the carriers is not less than the data rate, the orthogonality between the individual carriers is not required in the existing OFDM technology, and the influence of the carrier frequency offset on the system performance is reduced.
- each carrier can select a smaller granularity, the number of carriers can be combined to combine more different total bandwidths, instead of limiting the bandwidth of each carrier to 5 MHz as in the existing WCDMA technology.
- the total bandwidth can only be a multiple of 5MHz or 5MHz, which enables more flexible use of carrier resources and improves data transmission efficiency.
- the main parameters involved include carrier chip rate R, carrier bandwidth (carrier spacing) B, number of subcarriers M, and FIG. 4 is a schematic diagram of spectrum distribution of multiple carriers.
- p is an integer greater than 0, that is, the number of carriers is an integer power of 2, and the following relationship exists between the above parameters:
- Total system bandwidth number of subcarriers M X Carrier bandwidth 8.
- K/M mX (B/R), m is an integer greater than 0.
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X number of channels P X bits per symbol Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- the relationship between the parameters is as follows:
- Total system bandwidth number of carriers M X carrier bandwidth 8.
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X code number P X number of bits per symbol Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- the parameter configuration corresponding to the embodiment may refer to the parameter configuration in the embodiment corresponding to the data sending process of the present invention, for example, Table 1 to Table 4 and the corresponding descriptions are not described herein again.
- FIG. 9 is a schematic structural diagram of Embodiment 1 of a transmitting apparatus according to the present invention.
- the transmitting apparatus 900 of this embodiment may include: a coded modulation module 11, a mapping module 12, a spread spectrum and pre-processing module 13, and multi-carrier modulation. Module 14 and transmitting module 15, wherein
- a coded modulation module 11 for encoding and modulating data
- the mapping module 12 is configured to map the modulated data to M carriers, where M is an integer greater than 1, the carrier spacing of the M carriers is greater than or equal to a data rate, and the carrier spacing is a center of two carriers The spacing between frequency points;
- a spreading and pre-processing module 13 for performing spreading, scrambling and pre-coding processing on the sub-data mapped to each carrier;
- the multi-carrier modulation module 14 is configured to perform multi-carrier modulation on the data after the spreading, scrambling, and pre-coding processing;
- the sending module 15 is configured to send the multi-carrier modulated data to the receiving device. Further, the mapping module 12 is specifically configured to:
- Data is allocated to at least one of the M carriers.
- mapping module 12 is specifically configured to:
- the system bandwidth is divided into six carriers numbered 1, 2, 3, 4, 5, and 6.
- the data can be assigned to 1, 2, 3 three consecutive carriers, or the data can be divided into 1, 3 , 5 three equally spaced carriers.
- the multi-carrier modulation module 14 is specifically configured to:
- the signal after the cyclic delay is expanded is filtered, the K-point is added in stages, and the serial-to-serial conversion is performed.
- the signal after the cyclic delay is extended is ⁇ ! ! -! ! ⁇ M) (nu) , where i is an integer greater than 0, representing the label of the M carrier signal cyclic delay spread, x m .
- d(nK+1 , M) is the signal on the mod(nK+i, M) carrier, mod(nK+i, M) means that nK+i is modulo M, K is the oversampling factor, and n represents this time.
- n is an integer greater than 0
- u is an integer
- 0 u L f /Kl each time the cyclic delay spread processing Lf/K group signal, each set of signals includes M data.
- the multi-carrier modulation module 14 may include a memory 141.
- the memory 141 may be used to store initial data of a continuous time, the length of time is L f /K, and the data length of each time is M, the initial of the memory.
- the status value is 0, a position pointer p is set, and the initial value is 0.
- the M data is sequentially moved by the memory 141 (the M data corresponds to the data amount of one time), and the oldest time data is discarded, and the data is read in. New data for a moment ⁇ x.
- the transmitting device of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 1 , and the implementation principle thereof is not described herein again.
- the code modulation module 11, the mapping module 12, and the spread spectrum and pre-processing module 13 in this embodiment may be an encoder
- the multi-carrier modulation module 14 may be a modulator
- the sending module 15 may be a transmitter.
- the transmitting device can also be used to implement the technical solution of the method embodiment shown in FIG. 1.
- the transmitting device maps the modulated data to a plurality of carriers during data transmission, and after performing spreading, scrambling, and precoding processing, performing data multi-carrier on the transmitting port. After modulation and transmission, since the carrier spacing between the carriers is not less than the data rate, the orthogonality between the carriers is not required in the existing OFDM technology, and the influence of the carrier frequency offset on the system performance is reduced.
- each carrier can select a bandwidth with a smaller granularity, and by selecting the number of carriers, more different total bandwidths can be combined, thereby enabling More flexible use of carrier resources, improve the efficiency of data transmission, instead of limiting the bandwidth of each carrier to 5MHz as in the existing WCDMA technology, the total bandwidth can only be a multiple of 5MHz or 5MHz.
- the data transmission rate carrier chip rate rate RX carrier number
- the number of carriers M ⁇ 2 P , p is an integer greater than 1, and the number of complementary virtual carriers makes the total number of carriers
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X code number PX per symbol bit number Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- the oversampling factor K is 36 and the total bandwidth is 4.86 MHz.
- FIG. 10 is a schematic structural diagram of Embodiment 1 of a receiving apparatus according to the present invention.
- the receiving apparatus 1000 of this embodiment may include: a receiving module 21, a multi-carrier demodulating module 22, and a decoding module 23, where
- the receiving module 21 is configured to receive, by using the receiving port, the multi-carrier modulated signal sent by the sending device, where the number of carriers is M, M is an integer greater than 1, and the carrier spacing of the M carriers is greater than or equal to the data rate.
- the carrier spacing is a spacing between center frequency points of the two carriers;
- the multi-carrier demodulation module 22 is configured to perform multi-carrier demodulation on the signal;
- the decoding module 23 is configured to perform despreading, descrambling, demodulating, and decoding operations on the multicarrier demodulated signal to obtain target data.
- the multi-carrier demodulation module 22 can be specifically configured to:
- the multi-carrier modulated signal is cyclically delayed and subjected to a discrete Fourier transform DFT output.
- the multi-carrier demodulation module 22 can include a memory 221, and the multi-carrier demodulation module 22 is specifically configured to:
- the memory 221 is used to store an initial signal, and the signal in the memory 221 is filtered.
- the memory 221 reads the N received signals, discards the oldest N signals, performs filtering, M-point segment addition, rearrangement, M-point DFT conversion, and outputs; and so on until all time is read.
- N is the downsampling factor
- the value of N is the same as the value of the oversampling factor K used by the transmitting device for multicarrier modulation.
- K and N are integers greater than zero.
- the receiving apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in FIG. 6, and the implementation principle thereof is not described herein again.
- the receiving module 21 in this embodiment may be a receiver
- the multi-carrier demodulation module 22 may be a decoder
- the decoding module 23 may be a decoder
- the receiving device can also be used to execute FIG. 6
- the receiving device can also be used to execute FIG. 6
- the receiving device can also be used to execute FIG. 6
- the receiving device after the receiving device receives the multi-carrier modulated signal in the data receiving process, performing multi-carrier demodulation, and performing despreading, descrambling, and decoding operations on the multi-carrier demodulated signal, Get target data. Since the carrier spacing between the carriers is not less than the data rate, the orthogonality between the carriers is not required in the existing OFDM technology, and the influence of the carrier frequency offset on the system performance is reduced.
- each carrier can select a smaller granularity, the number of carriers can be combined to combine more different total bandwidths, instead of limiting the bandwidth of each carrier to 5 MHz as in the existing WCDMA technology.
- the total bandwidth can only be a multiple of 5MHz or 5MHz, which enables more flexible use of carrier resources and improves data transmission efficiency.
- the data transmission rate carrier chip rate rate RX carrier number M/data spreading factor SF X code channel number PX per symbol bit number Bits, where the data spreading factor SF is the symbol rate and code The ratio of the chip rates.
- the value of m may not be 1.
- the value of m may not be 1.
- a possible parameter configuration of the above embodiment is: carrier number M ⁇ 2 P , p is an integer greater than 1, and the complement number is a virtual carrier such that the total number of carriers
- Data transmission rate carrier chip rate rate RX carrier number M / data spreading factor SF X number of code bits P X bits per symbol Bits, where the data spreading factor SF is the ratio of the symbol rate to the chip rate.
- the bandwidth of each of the carriers is B KHz
- the oversampling factor K is 36 and the total bandwidth is 4.86 MHz.
- FIG. 11 is a schematic structural diagram of Embodiment 1 of a communication system according to the present invention.
- the communication system of this embodiment may include: a transmitting apparatus according to any embodiment of the present invention and a receiving apparatus according to any embodiment of the present invention. .
Abstract
Description
Claims
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CN201480000255.6A CN104956634B (zh) | 2014-01-26 | 2014-01-26 | 数据传输方法、装置和系统 |
PCT/CN2014/071504 WO2015109576A1 (zh) | 2014-01-26 | 2014-01-26 | 数据传输方法、装置和系统 |
EP14879387.0A EP3089415A4 (en) | 2014-01-26 | 2014-01-26 | DATA TRANSMISSION PROCESS, DEVICE AND SYSTEM |
KR1020167022132A KR20160110914A (ko) | 2014-01-26 | 2014-01-26 | 데이터 전송 방법, 장치 및 시스템 |
US15/218,622 US20160337098A1 (en) | 2014-01-26 | 2016-07-25 | Data transmission method, apparatus, and system |
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US15/218,622 Continuation US20160337098A1 (en) | 2014-01-26 | 2016-07-25 | Data transmission method, apparatus, and system |
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US (1) | US20160337098A1 (zh) |
EP (1) | EP3089415A4 (zh) |
KR (1) | KR20160110914A (zh) |
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CN111385003A (zh) * | 2018-12-27 | 2020-07-07 | 成都华为技术有限公司 | 数据传输方法和装置 |
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CN109076042A (zh) * | 2016-03-31 | 2018-12-21 | 华为技术有限公司 | 用于发送和接收多个多载波调制信号的发射器和接收器 |
CN108462664A (zh) * | 2017-02-22 | 2018-08-28 | 联芯科技有限公司 | 多载波数据的发射方法与装置 |
CN109152051B (zh) * | 2017-06-16 | 2022-04-22 | 华为技术有限公司 | 一种发送和接收数据的方法和装置 |
WO2018228600A1 (zh) | 2017-06-16 | 2018-12-20 | 华为技术有限公司 | 一种发送和接收数据的方法和装置 |
CN108901070B (zh) * | 2018-06-12 | 2023-04-07 | Oppo广东移动通信有限公司 | 无线通信传输方法、装置、移动终端及计算机可读取存储介质 |
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2014
- 2014-01-26 KR KR1020167022132A patent/KR20160110914A/ko not_active Application Discontinuation
- 2014-01-26 EP EP14879387.0A patent/EP3089415A4/en not_active Withdrawn
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US20090304100A1 (en) * | 2008-06-09 | 2009-12-10 | Qualcomm Incorporated | Interference reduction between ofdm carriers by frequency offset optimization |
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CN111385003B (zh) * | 2018-12-27 | 2021-06-29 | 成都华为技术有限公司 | 数据传输方法和装置 |
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US20160337098A1 (en) | 2016-11-17 |
EP3089415A1 (en) | 2016-11-02 |
CN104956634A (zh) | 2015-09-30 |
EP3089415A4 (en) | 2016-11-23 |
KR20160110914A (ko) | 2016-09-22 |
CN104956634B (zh) | 2018-06-19 |
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