WO2018058678A1 - Procédé et dispositif de traitement de signal - Google Patents

Procédé et dispositif de traitement de signal Download PDF

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Publication number
WO2018058678A1
WO2018058678A1 PCT/CN2016/101382 CN2016101382W WO2018058678A1 WO 2018058678 A1 WO2018058678 A1 WO 2018058678A1 CN 2016101382 W CN2016101382 W CN 2016101382W WO 2018058678 A1 WO2018058678 A1 WO 2018058678A1
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Prior art keywords
ofdm symbol
time domain
domain samples
ofdm
time
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PCT/CN2016/101382
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English (en)
Chinese (zh)
Inventor
铁晓磊
花梦
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华为技术有限公司
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Priority to PCT/CN2016/101382 priority Critical patent/WO2018058678A1/fr
Publication of WO2018058678A1 publication Critical patent/WO2018058678A1/fr

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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

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a signal processing method and device.
  • subcarriers with multiple subcarrier spacings can be simultaneously supported in the same system bandwidth.
  • the uplink of the narrowband Internet of Things (NB-IoT) system supports both subcarrier spacings of 3.75 kHz and 15 kHz.
  • the base station can simultaneously receive signals of two subcarrier spacings of 3.75 kHz and 15 kHz.
  • a base station For a base station, it is necessary to simultaneously process signals of a plurality of different subcarrier intervals. For example, with a Long Term Evolution (LTE) signal with a subcarrier spacing of 15 kHz and an NB-IoT signal with a 3.75 kHz as an example, the base station needs to follow the NB-IoT signal at the same sampling rate of 1.92 MHz.
  • the FT-IoT signal is filtered by the Fast Fourier Transformation (FFT) window, and the NB-IoT signal is subjected to 512-point FFT operation.
  • FFT Fast Fourier Transformation
  • the base station For the LTE signal, the base station needs to filter the LTE signal according to the FFT window of the LTE signal. And perform a 128-point FFT operation on the LTE signal. It can be seen that for different subcarrier spacing signals, the base station needs to separately filter for each signal by using different FFT windows, and perform FFT calculation, which makes the base station process signals have higher complexity
  • the embodiment of the invention discloses a signal processing method and device, which can reduce the complexity of processing signals by the receiving end device.
  • a first aspect of the embodiments of the present invention discloses a receiving end device, including: a radio frequency RF system and a baseband processor, where the baseband processor is connected to the RF system, where
  • the RF system is configured to receive an Orthogonal Frequency Division Multiplexing (OFDM) signal from an air interface, where the OFDM signal includes a first OFDM symbol of a first subcarrier spacing and a second OFDM symbol of an M second subcarrier spacing, a time domain length of the first OFDM symbol and M of the second OFDM The time domain length of the symbol is the same, the first subcarrier spacing is 1/M of the second subcarrier spacing, and M is a positive integer;
  • OFDM Orthogonal Frequency Division Multiplexing
  • the OFDM symbol of the first subcarrier spacing and the OFDM symbol of the second subcarrier spacing are multiplexed by a Frequency Division Multiplexing (FDM) method.
  • the frequency domain resource location allocated for the second OFDM symbol is different from the frequency domain resource location allocated for the first OFDM symbol.
  • the frequency domain resource location allocated for the second OFDM symbol can be understood as the position of the subcarrier allocated to the second OFDM symbol for carrying the frequency domain symbol in the system bandwidth.
  • the frequency domain resource location allocated for the first OFDM symbol can be understood as the position of the subcarrier allocated to the first OFDM symbol for carrying the frequency domain symbol in the system bandwidth, for example, the system bandwidth is from 10 MHz to 20 MHz.
  • the second OFDM symbol occupies 10 MHz to 15 MHz band resources, and the first OFDM symbol occupies 15 MHz to 20 MHz.
  • the baseband processor can multiplex the FFT processing result corresponding to the second OFDM symbol, and calculate the FFT processing result corresponding to the first OFDM symbol, that is, adopt a set of FFT window for the OFDM symbols with multiple subcarrier spacings.
  • the processing is performed instead of performing FFT calculations according to the respective FFT windows, thereby reducing the complexity of processing signals by the receiving device.
  • the baseband processor when performing window interception on a time domain sample of the OFDM signal, is further configured to:
  • Time domain samples of length N cp are removed from the OFDM signal prior to each of the FFT windows.
  • the first OFDM symbol of the first subcarrier spacing and the second OFDM symbol of the M second subcarrier spacing coexist in a preset frequency band, where the first OFDM symbol and The second OFDM symbol is from a different source device.
  • the preset frequency band is a frequency band that is transmitted by the system to the first OFDM symbol of the first subcarrier interval and the second OFDM symbol of the M second subcarrier spacing.
  • the time at which the receiving end device starts receiving the first OFDM symbol is T1
  • the receiving end device starts receiving the time points of the consecutive M second OFDM symbols.
  • the absolute value of the difference between the T1 and the T2 is less than a preset time threshold.
  • the preset time threshold may be a length of time of the cyclic prefix. In other words, the second OFDM symbol of consecutive M second subcarrier spacings and the first OFDM symbol of one first subcarrier spacing are aligned in time.
  • a second aspect of the embodiments of the present invention discloses a transmitting end device, including: a radio frequency RF system and a baseband processor, where the baseband processor is connected to the RF system, where
  • the baseband processor is used to:
  • N1 time domain samples corresponding to the first orthogonal frequency division multiplexing OFDM symbol of the first subcarrier interval, where the N1 time domain samples are inverse fast Fourier transform IFFT calculation on the input frequency domain signal
  • the RF system is configured to send the first OFDM symbol to a receiving end device.
  • the baseband processor performs segmentation and insertion of samples on the acquired time domain samples
  • the first OFDM symbol of the first subcarrier interval is generated and transmitted, so that the receiving end device receives In the signal, each segment of the first OFDM symbol and the M second OFDM symbols are respectively The upper end is aligned, so that the receiving end device can multiplex the FFT processing result corresponding to the second OFDM symbol, and further calculate the FFT processing result corresponding to the first OFDM symbol, thereby reducing the complexity of processing the signal by the receiving end device.
  • the first OFDM symbol of the first subcarrier interval and the second OFDM symbol of the second subcarrier interval coexist in a preset frequency band, and a time domain length of the first first OFDM symbol
  • the length of the time domain of the M second OFDM symbols is the same
  • the second subcarrier spacing is M times the interval of the first subcarrier.
  • the first OFDM symbol and the second OFDM symbol may be from the same source device or from different source devices.
  • a length of a cyclic prefix of the second OFDM symbol is the N cp .
  • the time when the second M OFDM symbol of the second subcarrier interval reaches the receiving end device and the time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device The absolute value of the difference is less than the preset time threshold;
  • an absolute value of a difference between a time when the S i arrives at the receiving end device and a time when the acyclic prefix portion of the second OFDM symbol reaches the receiving end device is less than a preset time threshold.
  • the preset time threshold may be a length of time of the cyclic prefix.
  • the absolute value of the difference between the time when the second OFDM symbol of the second M carrier interval reaches the receiving end device and the time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device is smaller than
  • the preset time threshold that is, the second OFDM symbol of consecutive M second subcarrier intervals and the first OFDM symbol of one first subcarrier interval are aligned in time.
  • a third aspect of the embodiments of the present invention discloses a signal processing method, including:
  • Orthogonal Frequency Division Multiplexing the OFDM signal comprising a first OFDM symbol of a first subcarrier spacing and a second OFDM symbol of the M second subcarrier spacing, a time domain of the first OFDM symbol
  • the length is the same as the time domain length of the M second OFDM symbols
  • the first subcarrier spacing is 1/M of the second subcarrier spacing
  • M is a positive integer
  • corresponding to the second subcarrier spacing M fast Fourier transform FFT windows for window clipping of time domain samples of the OFDM signal to obtain N2 time domain samples in each of the FFT windows; for each of the FFT windows N2 time domain samples perform an N2 point FFT calculation operation, and obtain N2 frequency domain samples corresponding to the FFT window; according to the frequency domain resource locations allocated for the second OFDM symbol, the N2 frequency domain samples Obtaining a frequency domain symbol of the second OFDM symbol; acquiring the first one from the N1 frequency domain samples in the M FFT windows according to a frequency domain resource location allocated
  • the baseband processor can multiplex the FFT processing result corresponding to the second OFDM symbol, and calculate the FFT processing result corresponding to the first OFDM symbol, that is, adopt a set of FFT window for the OFDM symbols with multiple subcarrier spacings.
  • the processing is performed instead of performing FFT calculations according to the respective FFT windows, thereby reducing the complexity of processing signals by the receiving device.
  • the method when performing window interception on a time domain sample of the OFDM signal, the method further includes:
  • Time domain samples of length N cp are removed from the OFDM signal prior to each of the FFT windows.
  • the first OFDM symbol of the first subcarrier spacing and the second OFDM symbol of the M second subcarrier spacing coexist in a preset frequency band, the first OFDM symbol and the The second OFDM symbol is from a different source device.
  • the time point at which the first OFDM symbol is received is T1
  • the time point at which the consecutive M second OFDM symbols are received is T2
  • the T1 and the T2 are The absolute value of the difference is less than the preset time threshold.
  • a fourth aspect of the embodiments of the present invention discloses a signal processing method, including:
  • N1 time domain samples corresponding to the first orthogonal frequency division multiplexing OFDM symbol of the first subcarrier interval, where the N1 time domain samples are inverse fast Fourier transform IFFT calculation on the input frequency domain signal
  • the baseband processor can perform segmentation, insertion of samples, and the like on the acquired time domain samples, and then generate and transmit the first OFDM symbol of the first subcarrier spacing.
  • each segment of the first OFDM symbol is temporally aligned with the M second OFDM symbols, respectively, so that the receiving end device can multiplex the FFT processing corresponding to the second OFDM symbol.
  • the FFT processing result corresponding to the first OFDM symbol is further calculated, thereby reducing the complexity of processing the signal by the receiving end device.
  • the first OFDM symbol of the first subcarrier spacing and the second OFDM symbol of the second subcarrier spacing coexist in a preset frequency band, and a time domain length of the first OFDM symbol is
  • the M second OFDM symbols have the same time domain length, and the second subcarrier spacing is M times the first subcarrier spacing.
  • the length of the cyclic prefix of the second OFDM symbol is the N cp .
  • the time when the second M OFDM symbol of the second M carrier interval reaches the receiving end device and the time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device The absolute value of the difference is less than the preset time threshold;
  • an absolute value of a difference between a time when the S i arrives at the receiving end device and a time when the acyclic prefix portion of the second OFDM symbol reaches the receiving end device is less than a preset time threshold.
  • the fifth aspect of the embodiment of the present invention discloses a baseband processor in a receiving end device or a receiving end device, where the baseband processor in the receiving end device or the receiving end device includes any third aspect of the embodiment of the present invention.
  • the baseband processor in the receiving end device or the receiving end device can reduce the complexity of processing signals when performing some or all of the steps of any of the methods of the third aspect.
  • a sixth aspect of the embodiments of the present invention discloses a baseband processor in a transmitting end device or a transmitting end device, where the baseband processor in the transmitting end device or the transmitting end device includes any of the fourth aspect of the embodiments of the present invention.
  • a functional unit of some or all of the steps of a method the When the baseband processor in the sending end device or the transmitting end device performs some or all of the steps of any of the fourth methods, the obtained time domain samples can be segmented, inserted, and the like, and the first subcarrier spacing is generated. The first OFDM symbol is transmitted and transmitted.
  • a seventh aspect of the embodiments of the present invention discloses a computer storage medium storing a program, the program specifically comprising instructions for performing some or all of the steps of any of the third aspects of the embodiments of the present invention.
  • the eighth aspect of the embodiments of the present invention discloses a computer storage medium, where the computer storage medium stores a program, and the program specifically includes instructions for performing some or all of the steps of any of the fourth aspects of the embodiments of the present invention.
  • the radio frequency RF system includes an antenna, a radio frequency front end RFFE, and a radio frequency chip RFIC, the antenna is connected to the RFFE, and the RFFE is connected to the RFIC;
  • the antenna is configured to receive the OFDM signal from an air interface;
  • the RFFE is configured to couple the OFDM signal received by the antenna to the RFIC;
  • the RFIC is configured to perform a down conversion process on the OFDM signal.
  • the down conversion processing is specifically demodulation.
  • the radio frequency RF system includes an antenna, a radio frequency front end RFFE, and a radio frequency chip RFIC, the antenna is connected to the RFFE, and the RFFE is connected to the RFIC;
  • the RFIC is configured to perform an up-conversion process on the first OFDM symbol;
  • the RFFE is configured to couple the first OFDM symbol generated by up-converting the RFIC to the antenna;
  • the antenna is used to send The first OFDM symbol.
  • the up-conversion processing is specifically modulation.
  • FIG. 1 is a schematic diagram of a network architecture of a wireless communication system according to an embodiment of the present invention
  • 1A is a schematic diagram of a transmission and reception structure of an OFDM system according to an embodiment of the present invention.
  • FIG. 1B is a schematic structural diagram of a device at a transmitting end according to an embodiment of the present invention
  • FIG. 2 is a schematic flow chart of a signal processing method according to an embodiment of the present invention.
  • 2A is a schematic diagram showing a symbol structure of a first OFDM symbol of a first subcarrier interval according to an embodiment of the present disclosure
  • FIG. 3 is a schematic flow chart of another signal processing method according to an embodiment of the present invention.
  • FIG. 3A is a schematic diagram of a symbol structure of coexistence of OFDM symbols with different subcarrier spacings according to an embodiment of the present invention
  • FIG. 3B is a schematic diagram of an iterative process of FFT calculation according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a baseband processor in a transmitting end device or a transmitting end device according to an embodiment of the present invention
  • FIG. 5 is a schematic structural diagram of a baseband processor in a receiving end device or a receiving end device according to an embodiment of the present invention.
  • the embodiment of the invention discloses a signal processing method and device, which can reduce the complexity of processing signals by the receiving end device. The details are described below separately.
  • FIG. 1 is a schematic diagram of a network architecture of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system includes a receiving end device 010 and a plurality of transmitting end devices (such as a transmitting end device 021, a transmitting end device 022, a transmitting end device 023, ... a transmitting end device 028), and those skilled in the art.
  • a transmitting end device 021, a transmitting end device 022, a transmitting end device 023, ... a transmitting end device 028 such as a transmitting end device 021, a transmitting end device 022, a transmitting end device 023, ... a transmitting end device 028
  • FIG. 1 is a schematic diagram of a network architecture of a wireless communication system according to an embodiment of the present invention.
  • the wireless communication system includes a receiving end device 010 and a plurality of transmitting end devices (such as a transmitting end device 021, a transmitting end device 022, a transmitting end device 023, ... a
  • the receiving end device 010 may be one or more of a base station or an access point or a base station controller, and the receiving end device 010 is configured to provide communication services for the at least one wireless terminal, where the sending end device may be a wireless terminal, where
  • the wireless terminal may include, but is not limited to, a smart phone, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a mobile internet device (MID), a smart wearable device (eg, Smart watches, smart bracelets and other electronic devices.
  • the wireless communication system may include, but is not limited to, a narrowband Internet of Things (NB-IoT) system and a future fifth generation mobile communication technology (5th-Generation, 5G) system, in which the wireless communication system can simultaneously Supporting subcarriers with multiple subcarrier spacings, where subcarrier spacing is the interval between center frequency points between two adjacent subcarriers, and for Long Term Evolution (LTE) signals, subcarrier spacing At 15 kHz, for NB-IOT, the subcarrier spacing is 3.75 kHz.
  • NB-IoT narrowband Internet of Things
  • 5G fifth generation mobile communication technology
  • the uplink of the NB-IoT system supports both subcarriers with 3.75 kHz and 15 kHz subcarrier spacing; in the 5G system, different subcarrier spacing signals need to be deployed in the same frequency band to support a wider range of scenarios and richer. Applications.
  • the uplink and downlink system bandwidths of the NB-IoT system are both 200 kHz.
  • the NB-IoT system uses OFDM (Orthogonal Frequency Division Multiplexing) technology, and the NB-IoT system uses SC. -FDMA (Single-Carrier Frequency Division Multiplexing Access) technology.
  • 5G systems still use OFDM technology.
  • the SC-FDMA signal transmission is actually a Discrete Fourier Transform (DFT) process on the time domain signal, and then mapped to a subcarrier corresponding to the frequency resource, the modulation mode of the OFDM is adopted. Signal modulation is sent out. Therefore, in the present invention
  • DFT Discrete Fourier Transform
  • OFDM symbol the terms in the embodiment are collectively described using terms such as "OFDM symbol”. However, the present invention is equally applicable to the case of SC-FDMA signal transmission.
  • FIG. 1A is a schematic diagram of a transmitting and receiving structure of an OFDM system according to an embodiment of the present invention.
  • the transmitting end device performs subcarrier mapping on the input symbol sequence ⁇ x n ⁇ and performs serial-to-parallel conversion, and then performs inverse discrete Fourier transform through N points (Inverse Discrete Fourier Transform). , IDFT)/Inverse Fast Fourier Transformation (IFFT) calculation, after inserting the Cyclic Prefix (CP) and doing D/A conversion (DAC), the OFDM time domain signal is obtained, and then the RF is obtained.
  • IDFT Inverse Discrete Fourier Transform
  • IFFT Inverse Fast Fourier Transformation
  • CP Cyclic Prefix
  • DAC D/A conversion
  • the (Radio Frequency, RF) section transmits the OFDM time domain signal over the multipath channel.
  • the receiving end device performs A/D conversion (ADC), and removes the cyclic prefix CP according to the DFT/Fast Fourier Transformation (FFT) window. And performing DFT/FFT calculation operation, after extracting each modulation symbol on the corresponding subcarrier, that is, subcarrier demapping, and then performing demodulation and decoding operation, the original bit sequence ⁇ x n ⁇ can be recovered.
  • ADC A/D conversion
  • FFT DFT/Fast Fourier Transformation
  • the symbol sequence to be transmitted is serial-to-parallel converted (optionally, a zero-padding operation can also be performed), and the symbol after serial-to-output is added after several zero points, each X
  • the symbols are a group, and the IFFT processing is performed to obtain X points, and the output is subjected to parallel-to-serial conversion, that is, corresponding to X symbol samples in the time domain.
  • the transmitting device inserts a cyclic prefix of several samples (assumed to be Y) before the X symbol samples, and the cyclic prefix is actually X.
  • the time corresponding to the OFDM symbol corresponds to (X+Y) sample points in the time domain, and the time corresponding to the OFDM symbol is ((X+Y) ⁇ Ts) second time length, where Ts is the reciprocal of the sampling rate SHz .
  • Ts is the reciprocal of the sampling rate SHz .
  • the time corresponding to the cyclic prefix (X ⁇ Ts) should be greater than a certain threshold ThresholdCP, which is the length of the multipath delay spread of the channel between the transmitting and receiving parties (the transmitting device and the receiving device).
  • ThresholdCP is the length of the multipath delay spread of the channel between the transmitting and receiving parties (the transmitting device and the receiving device).
  • the communication environment is determined by the location.
  • FIG. 1B is a schematic structural diagram of a transmitting end device according to an embodiment of the present invention.
  • the transmitting end device 020 shown in FIG. 1B may be any one of the transmitting end devices shown in FIG. .
  • the transmitting device 020 includes a radio frequency (RF) system 21 and a baseband processor 22, and the baseband processor 22 is connected to the RF system 21, wherein the RF system 21 can include At least one of an antenna, a radio frequency front end (RFFE), or a radio frequency integrated circuit (RFIC) (not shown).
  • RF radio frequency
  • RFIC radio frequency integrated circuit
  • the antenna is coupled to the RFFE, the RFFE is coupled to the RFIC, the RFIC is for modulating or demodulating an RF signal, and the RFFE is for receiving or transmitting the RF signal through the antenna.
  • the signal transmitted from the baseband processor 22 is modulated by the RFIC and coupled to the antenna for transmission (transmitting channel) via the RFFE, or the RFFE couples the air interface signal received by the antenna to the RFIC, and the air interface signal is demodulated by the RFIC and sent to the baseband for processing at the back end.
  • the device 22 is processed by a communication protocol (receiving channel).
  • the baseband processor 22 mainly processes the baseband signal and can process various communication protocols such as 2/3/4/5G (Generation).
  • the baseband processor 22 can include a plurality of logic gate cells or transistors and can be integrated on a substrate to form a chip by an integrated circuit fabrication process.
  • the structure of the receiving device is also similar to the structure of FIG. 1B and
  • the receiving end device it is sometimes necessary to receive and process signals of two different subcarrier intervals at the same time.
  • the receiving device may need to process signals of multiple subcarrier spacings simultaneously, for example, in a 5G system.
  • the baseband processor included in the sending end device can perform corresponding processing on the signal to be sent (refer to the description in the following embodiments), and the receiving end device receives the processed by the sending end device. After the signal, the complexity of the processed signal can be reduced when processing the processed signal.
  • the structure of the transmitting end device or the receiving end device in FIG. 1B is only a preferred implementation manner in the embodiment of the present invention, and the structure of the receiving end device and the structure of the transmitting end device in the embodiment of the present invention. Including but not limited to the above structure, as long as the structure of the receiving end device and the structure of the transmitting end device capable of realizing the signal processing method in the present invention are within the scope of protection and coverage of the present invention.
  • FIG. 2 is a schematic flowchart diagram of a signal processing method according to an embodiment of the present invention.
  • the signal processing method is applied to the transmitting device shown in FIG. 1B, and the signal processing method is described below from the baseband processor side in the transmitting device.
  • the signal processing method may include the following steps:
  • the baseband processor acquires N1 time domain samples corresponding to the first orthogonal frequency division multiplexing OFDM symbol of the first subcarrier spacing.
  • the N1 time domain samples are time domain samples in which the cyclic prefix is not inserted after the inverse fast Fourier transform IFFT calculation on the input frequency domain signal, and N1 is a positive integer.
  • Orthogonal Frequency Division Multiplexing which is one of multi-carrier modulation schemes, distributes high-speed data streams into a number of parallel low-speed subchannels for transmission by serial-to-parallel conversion.
  • the baseband processor in the transmitting end device may first obtain an inverse fast fasting on the input frequency domain signal.
  • the time domain samples of the cyclic prefix are not inserted after the ENERGY transform IFFT calculation, and further processing is performed to generate the first OFDM symbol.
  • the baseband processor divides the N1 time domain samples into M segments.
  • each segment is labeled as S i
  • the baseband processor may divide the N1 time domain samples into M segments according to a preset rule, and the preset rule is designed according to a specific M value, that is, according to the first subcarrier spacing and the second subcarrier. The relationship of the intervals is determined.
  • the first subcarrier spacing is 3.75 kHz and the second subcarrier spacing is 15 kHz.
  • the second subcarrier spacing is four times the first subcarrier spacing, assuming a 3.75 kHz OFDM symbol.
  • the 8192 time domain samples are equally divided into four segments, which are respectively denoted as S 0 , S 1 , S 2 and S.
  • the time domain samples of a 3.75 kHz OFDM symbol are denoted as x(0), x(1), ..., x(8191), then the four segments after segmentation
  • the number of time domain samples contained in the segment are: S 0 : ⁇ x(0), x(1), ..., x(2047) ⁇ , S 1 : ⁇ x(2048), x(2049), ..., x(4095) ⁇ , S 2 : ⁇ x(4096), x(4097),...,x(6143) ⁇ and S 3 : ⁇ x(6144),x(6145),...,x(8191) ⁇ .
  • the N cp time domain samples are the last N cp time domain samples of the N 2 time domain samples of S ⁇ (i-1) mod M ⁇ , and N cp is a positive integer. Specifically, N cp is greater than A positive integer that presets the threshold.
  • the size of N cp depends on the communication environment. The longer the multipath delay spread in the communication environment, the larger the N cp is, so as to reduce the intersymbol interference caused by the multipath delay extension, and then the length of N cp cannot be too long. Otherwise, Air interface overhead will increase.
  • the length of the CP should be determined by the communication environment to which the system belongs, and both the transceiver and the dual-issue perform OFDM modulation and demodulation according to a preset value or a pre-agreed N cp length.
  • the baseband processor determines the sequentially aligned (N CP ⁇ M+N1) time domain samples as the first OFDM symbol of the first subcarrier spacing, and transmits the first OFDM symbol to the radio frequency RF system.
  • the sequential arrangement means that (N CP ⁇ M+N1) time domain samples have a certain time domain order.
  • FIG. 2A is a schematic diagram showing the symbol structure of a first OFDM symbol of a first subcarrier interval according to an embodiment of the present invention.
  • Each small square shown in FIG. 2A represents 128 time domain samples, called a set of time domain samples, each of which carries information.
  • the sender device obtains 8192 time domain samples as follows:
  • the transmitting device inserts 256 time domain samples before 2048 time domain samples of S i , specifically, for S 0 , the transmitting device is at 2048 times of S 0 .
  • the last 256 time domain samples of the 2048 time domain samples of S 3 are inserted before the domain sample, that is, the time domain samples corresponding to K'L' are inserted.
  • the transmitting device inserts the last 256 time domain samples of the 2048 time domain samples of S 0 before the 2048 time domain samples of S 1 , that is, inserts the time domain samples corresponding to the op; for S 2, the transmission side apparatus is inserted into the last 256 time domain samples S 2048 time-domain samples of a prior S 2048 time-domain samples 2, i.e., the insertion time domain samples EF corresponding to; for S 3 The transmitting device inserts the last 256 time domain samples of the 2048 time domain samples of S 2 before the 2048 time domain samples of S 3 , that is, inserts the time domain samples corresponding to the UV.
  • the first OFDM symbol of the first subcarrier interval and the second OFDM symbol of the second subcarrier interval coexist in a preset frequency band, and a time domain length of the first OFDM symbol
  • the length of the time domain of the M second OFDM symbols is the same, and the second subcarrier spacing is M times the interval of the first subcarrier.
  • the first OFDM symbol and the second OFDM symbol may be from different source devices, or the first OFDM symbol and the second OFDM symbol may be from the same source device.
  • the cyclic prefix of the second OFDM symbol has a length of N cp .
  • a difference between a time when the second OFDM symbol of the second M subcarrier interval reaches the receiving end device and a time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device The absolute value is less than the preset time threshold
  • the absolute value of the difference between the time when the S i arrives at the receiving device and the time when the acyclic prefix portion of the second OFDM symbol arrives at the receiving device for each S i is less than a preset time threshold.
  • the preset time threshold may be a length of time of the cyclic prefix.
  • the absolute value of the difference between the time when the second OFDM symbol of the second M subcarrier interval reaches the receiving end device and the time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device is less than a preset time threshold. In other words, the second OFDM symbol of consecutive M second subcarrier spacings and the first OFDM symbol of one first subcarrier spacing are aligned in time.
  • the start symbol boundary of the second OFDM symbol of the consecutive M second subcarrier intervals is aligned with the start symbol boundary of the first OFDM symbol of the first subcarrier interval, and consecutive M
  • the end symbol boundary of the second OFDM symbol of the second subcarrier spacing is temporally aligned with the end symbol boundary of the first OFDM symbol of a first subcarrier spacing.
  • time alignment is performed by letting different transmitting devices pass Timing Advance in advance, so that signals sent by different transmitting terminals are substantially aligned at the time of arrival of the receiving device or
  • the time difference is within the preset range.
  • the amount of time sent is related to the distance of the propagation path between the transmitting device and the receiving device, and the time difference is within the preset range, that is, the time difference between the signals sent by different transmitting devices and the receiving device reaches the length of the CP.
  • the OFDM signal removes the CP portion after reception and performs FFT processing, in this way, different subcarriers remain orthogonal.
  • the baseband processor performs segmentation and time domain sample processing on the acquired time domain samples, and then generates a first OFDM symbol of the first subcarrier spacing. And transmitting, so that each segment of the first OFDM symbol is temporally aligned with the M second OFDM symbols, so that the receiving end device can multiplex the FFT corresponding to the second OFDM symbol. Processing the result, and calculating the FFT processing knot corresponding to the first OFDM symbol Therefore, the complexity of processing signals by the receiving device is reduced.
  • the radio frequency RF system includes an antenna, a radio frequency front end RFFE, and a radio frequency chip RFIC, the antenna is connected to the RFFE, and the RFFE is connected to the RFIC; the RFIC is used to The first OFDM symbol is subjected to up-conversion processing; the RFFE is configured to couple the first OFDM symbol generated by up-converting the RFIC to the antenna; and the antenna is configured to send the first OFDM symbol.
  • the up-conversion processing is specifically modulation.
  • FIG. 3 is a schematic flowchart diagram of another signal processing method according to an embodiment of the present invention, where the signal processing method is applied to the receiving device shown in FIG. 1B.
  • the signal processing method will be described below from the baseband processor side in the receiving device.
  • the signal processing method may include the following steps:
  • a baseband processor receives an orthogonal frequency division multiplexing OFDM signal.
  • the receiving end device may receive the orthogonal frequency division multiplexing OFDM signal from the RF system.
  • the OFDM signal includes a first OFDM symbol of a first subcarrier spacing and a second OFDM symbol of the M second subcarrier spacing, a time domain length of one first OFDM symbol and a time domain of the M second OFDM symbols.
  • the length is the same
  • the first subcarrier spacing is 1/M of the second subcarrier spacing
  • M is a positive integer.
  • the first OFDM symbol and the second OFDM symbol may be from the same source device or from different source devices.
  • the first OFDM symbol and the second OFDM symbol sent by different sending end devices are taken as an example, that is, OFDM symbols with different subcarrier spacings coexist.
  • the OFDM symbol of the first subcarrier spacing and the OFDM symbol of the second subcarrier spacing are multiplexed by Frequency Division Multiplexing (FDM), and the first OFDM symbol of the first subcarrier spacing And the second OFDM symbols of the M second subcarrier spacings coexist in a preset frequency band.
  • FDM Frequency Division Multiplexing
  • the first OFDM symbol of the first subcarrier interval is processed by the transmitting end device according to the method described in FIG. 2, and then transmitted to the RF system, and sent by the RF system to the receiving end device.
  • the time point at which the first OFDM symbol is received is T1
  • the time point at which the start of the M consecutive OFDM symbols is started is T2
  • the absolute value of the difference between T1 and T2 is less than the preset time threshold.
  • FIG. 3A is a schematic diagram of a symbol structure of OFDM symbols coexisting with different subcarrier spacings according to an embodiment of the present invention, where the first OFDM symbol and the second OFDM symbol are from different transmitting devices.
  • the first subcarrier spacing is 1/4 of the second subcarrier spacing
  • the first OFDM symbol of the first subcarrier spacing is sent by the transmitting end device according to the method described in FIG.
  • the OFDM signal includes a first OFDM symbol of a first subcarrier spacing and a second OFDM symbol of four consecutive second subcarrier spacings.
  • the symbol boundary of the first OFDM symbol of one first subcarrier interval and the symbol boundary of the second OFDM symbol of consecutive four second subcarrier intervals are aligned in time. And, further, for each segment S i of the first OFDM symbol, the segment S i is respectively temporally aligned with the acyclic prefix portion of a certain second OFDM symbol, wherein the acyclic prefix portion refers to A valid time domain sample (that is, a time domain sample that carries useful information).
  • each segment of the first OFDM symbol of the first subcarrier spacing includes a number of time domain samples that coincide with the number of time domain samples included in the second OFDM symbol of the second subcarrier spacing.
  • the baseband processor performs window clipping on the time domain samples of the OFDM signal according to the M fast Fourier transform FFT windows corresponding to the second subcarrier spacing, to obtain N2 time domain samples in each FFT window.
  • the transmitting end device since the transmitting end device performs corresponding processing on the first OFDM symbol (that is, the processing method described in FIG. 2), the OFDM symbol for two different subcarrier spacings may be processed by using a set of FFT windows. .
  • the baseband processor when the baseband processor performs window clipping on the time domain samples of the OFDM signal according to the M fast Fourier transform FFT windows corresponding to the second subcarrier spacing, the baseband processor may also obtain the OFDM signal from the OFDM signal.
  • the removal length is a time domain sample of N cp . 303.
  • the baseband processor performs an N2 point FFT calculation operation on the N2 time domain samples in each FFT window to obtain N2 frequency domain samples corresponding to the FFT window.
  • the baseband processor in view of the corresponding processing of the first OFDM symbol by the transmitting device, so that a set of FFT windows can be used for processing, the baseband processor only needs N2 time domain samples in each FFT window. The point performs an N2 point FFT calculation operation, and N2 frequency domain samples can be obtained for each FFT window.
  • the N2 frequency domain samples correspond to N2 subcarriers, wherein the N2 subcarriers are determined by dividing a system bandwidth according to a second subcarrier spacing, where the system bandwidth is a first OFDM provided by the system to the first subcarrier spacing.
  • the symbol and the frequency band of the second OFDM symbol transmission of the M second subcarrier spacing correspond to N2 subcarriers, wherein the N2 subcarriers are determined by dividing a system bandwidth according to a second subcarrier spacing, where the system bandwidth is a first OFDM provided by the system to the first subcarrier spacing.
  • the baseband processor acquires frequency domain symbols of the second OFDM symbol from the N2 frequency domain samples according to the frequency domain resource location allocated for the second OFDM symbol.
  • the frequency domain resource location allocated for the second OFDM symbol can be understood as the position of the subcarrier allocated to the second OFDM symbol for carrying the frequency domain symbol in the system bandwidth, for example, the system bandwidth is from 10 MHz to 20 MHz. Location, where the second OFDM symbol occupies 10 MHz to 15 MHz band resources.
  • the baseband processor may determine, according to a frequency domain resource location allocated for the second OFDM symbol, a subcarrier used by the second OFDM symbol, and further, may determine, by using the N2 frequency domain samples, the second OFDM symbol.
  • the frequency domain samples carried on the subcarriers are frequency domain symbols of the second OFDM symbol.
  • the baseband processor may demodulate and decode the frequency domain symbols of the second OFDM symbol to obtain information transmitted by the transmitting end device through the second OFDM symbol.
  • the baseband processor acquires frequency domain symbols of the first OFDM symbol from N1 frequency domain samples in the M FFT windows according to the frequency domain resource location allocated for the first OFDM symbol.
  • the frequency domain resource location allocated for the first OFDM symbol can be understood as the location of the subcarrier allocated for the frequency domain symbol in the system bandwidth allocated to the first OFDM symbol.
  • the system bandwidth is from 10 MHz to 20 MHz, and the first OFDM symbol occupies 15 MHz to 20 MHz.
  • the frequency domain resource location allocated for the first OFDM symbol is different from the frequency domain resource location allocated for the second OFDM symbol.
  • Both N1 and N2 are positive integers.
  • the system bandwidth is from 10MHz To a position of 20 MHz, wherein the second OFDM symbol occupies 10 MHz to 15 MHz band resources, and the first OFDM symbol occupies 15 MHz to 20 MHz.
  • the baseband processor may iteratively combine the N2 frequency domain samples corresponding to the M FFT windows to obtain N1 frequency domain samples, N1.
  • the frequency domain samples correspond to N1 subcarriers, wherein the N1 subcarriers are determined by dividing the system bandwidth according to the first subcarrier spacing.
  • the baseband processor may determine the subcarrier used by the first OFDM symbol according to the frequency domain resource location allocated for the first OFDM symbol, and further, may determine the subcarrier used by the first OFDM symbol from the N1 frequency domain samples.
  • the frequency domain sample carried on is the frequency domain symbol of the first OFDM symbol. Further, the baseband processor may demodulate and decode the frequency domain symbols of the first OFDM symbol to obtain information transmitted by the transmitting end device through the first OFDM symbol.
  • the frequency domain symbol may be all or part of the corresponding OFDM symbol in the frequency domain.
  • its frequency domain symbol may be part of the first OFDM symbol in the frequency domain.
  • its frequency domain symbol may be all of the second OFDM symbol in the frequency domain.
  • N1 frequency domain samples are obtained by processing M ⁇ N2 frequency domain samples.
  • N2 frequency domain samples are obtained by processing M ⁇ N2 frequency domain samples.
  • DFT DFT
  • the algorithm complexity of O(N 2 ) is required, which obviously increases exponentially with the number of points calculated by DFT.
  • FFT is a fast algorithm of DFT
  • FFT is obtained by improving the algorithm of DFT according to the characteristics of odd, even, virtual and real of DFT.
  • the DFT result X k of the N point can be decomposed into further processing of the DFT results of the two N/2 points, that is, the even points of the x(n) respectively.
  • the sequence of the sequence and the odd point is subjected to an N/2 point DFT operation, and the DFT result of the N point x(n) is calculated according to the above formula (1).
  • the baseband processor may perform iterative processing on the N2 frequency domain samples corresponding to the M FFT windows according to the formula (2), and obtain N1 frequency domain samples.
  • each segment S i of the M segments of the OFDM symbol of the first subcarrier interval is aligned with the FFT window of a second subcarrier interval
  • a second set may be adopted.
  • the FFT window of the subcarrier spacing processes the OFDM signal, and performs an N2 point FFT calculation operation only for N2 time domain samples in each FFT window, and obtains N2 frequency domain samples corresponding to the FFT window, and then from N2 frequencies.
  • the frequency domain symbols of the second OFDM symbol are obtained in the domain sample, and the N2 frequency domain samples corresponding to the M FFT windows are iterated to obtain N1 frequency domain samples, and the N1 frequency domain samples are obtained.
  • the radio frequency RF system includes an antenna, a radio frequency front end RFFE, and a radio frequency chip RFIC, the antenna is connected to the RFFE, and the RFFE is connected to the RFIC;
  • the antenna is configured to receive the OFDM signal from an air interface;
  • the RFFE is configured to couple the OFDM signal received by the antenna to the RFIC;
  • the RFIC is configured to perform a down conversion process on the OFDM signal.
  • the down conversion processing is specifically demodulation.
  • the baseband processor receives the OFDM signal from the RF system
  • the baseband processor may multiplex the FFT processing result corresponding to the second OFDM symbol, and calculate the FFT processing result corresponding to the first OFDM symbol, that is, the interval of multiple subcarriers.
  • the OFDM symbols are processed by a set of FFT windows instead of performing FFT calculations according to the respective FFT windows, thereby reducing the complexity of processing signals by the receiving device.
  • FIG. 4 is a schematic structural diagram of a baseband processor in a transmitting end device or a transmitting end device according to an embodiment of the present invention, where the baseband processor 400 in the transmitting end device 400 or the transmitting end device is used.
  • the baseband processor 400 in the source device 400 or the source device may include:
  • the obtaining unit 401 is configured to acquire N1 time domain samples corresponding to the first orthogonal frequency division multiplexing OFDM symbol of the first subcarrier interval, where the N1 time domain samples are inversely fast for the input frequency domain signal.
  • the time domain sample of the cyclic prefix is not inserted after the Fourier transform IFFT calculation, and N1 is a positive integer;
  • Insertion unit 403 is configured for the S i, N cp inserted time-domain samples prior to the N2 of the time domain samples S i, wherein the time domain samples N cp point S ⁇ (i -1) The last N cp time domain samples of N2 time domain samples of mod M ⁇ , N cp is a positive integer;
  • the determining sending unit 404 is configured to determine the (N CP ⁇ M+N1) time domain samples arranged in order as the first OFDM symbol of the first subcarrier interval, and send the first OFDM symbol.
  • the first OFDM symbol of the first subcarrier interval and the second OFDM symbol of the second subcarrier interval coexist in a preset frequency band, and the time domain length of the first OFDM symbol and the M second OFDM symbols The length of the time domain is the same, and the second subcarrier spacing is M times the interval of the first subcarrier.
  • the length of the cyclic prefix of the second OFDM symbol is the N cp .
  • the absolute value of the difference between the time when the second OFDM symbol of the second M carrier interval reaches the receiving end device and the time when the first OFDM symbol of the first subcarrier interval reaches the receiving end device is smaller than Preset time threshold;
  • an absolute value of a difference between a time when the S i arrives at the receiving end device and a time when the acyclic prefix portion of the second OFDM symbol reaches the receiving end device is less than a preset time threshold.
  • the acquired time domain samples may be segmented, inserted, and the like, and then generated.
  • the first OFDM symbol of the subcarrier spacing is transmitted and transmitted, so that each segment of the first OFDM symbol is temporally aligned with the M second OFDM symbols, so that the receiving end device can be recovered.
  • the FFT processing result corresponding to the second OFDM symbol is calculated, thereby reducing the complexity of processing the signal by the receiving end device.
  • FIG. 5 is a schematic structural diagram of a baseband processor in a receiving end device or a receiving end device according to an embodiment of the present invention, where the baseband processor 500 in the receiving end device 500 or the receiving end device is used.
  • the baseband processor 500 in the receiving end device 500 or the receiving end device may include:
  • the receiving unit 501 is configured to receive an Orthogonal Frequency Division Multiplexing (OFDM) signal, where the OFDM signal includes a first OFDM symbol of a first subcarrier spacing and a second OFDM symbol of the M second subcarrier spacing, one of the foregoing
  • OFDM Orthogonal Frequency Division Multiplexing
  • the time domain length of an OFDM symbol is the same as the time domain length of the M second OFDM symbols, and the first subcarrier spacing is 1/M of the second subcarrier spacing, and M is a positive integer;
  • the intercepting unit 502 is configured to perform window clipping on the time domain samples of the OFDM signal according to the M fast Fourier transform FFT windows corresponding to the second subcarrier spacing, to obtain N2 in each of the FFT windows.
  • Time domain sample is configured to perform window clipping on the time domain samples of the OFDM signal according to the M fast Fourier transform FFT windows corresponding to the second subcarrier spacing, to obtain N2 in each of the FFT windows.
  • the calculating unit 503 is configured to perform an N2 point FFT calculation operation on the N2 time domain samples in each of the FFT windows to obtain N2 frequency domain samples corresponding to the FFT window;
  • An obtaining unit 504 configured to acquire frequency domain symbols of the second OFDM symbol from the N2 frequency domain samples according to a frequency domain resource location allocated for the second OFDM symbol;
  • the acquiring unit 504 is further configured to acquire frequency domain symbols of the first OFDM symbol from N1 frequency domain samples in the M FFT windows according to the frequency domain resource location allocated for the first OFDM symbol.
  • the baseband processor 500 shown in FIG. 5 may further include:
  • the intercepting unit 502 is further configured to remove a time domain sample of length N cp from the OFDM signal before performing window clipping on the time domain sample of the OFDM signal.
  • the first OFDM symbol of the first subcarrier spacing and the second OFDM symbol of the M second subcarrier spacing coexist in a preset frequency band, where the first OFDM symbol and the second OFDM symbol are from On different sender devices.
  • the time at which the receiving unit 501 starts receiving one of the first OFDM symbols is T1
  • the time at which the receiving unit 501 starts receiving the consecutive M second OFDM symbols is T2, where the T1 and The absolute value of the difference of T2 is less than a preset time threshold.
  • the preset time threshold may be the length of time of the cyclic prefix.
  • the FFT processing result corresponding to the second OFDM symbol may be multiplexed, and the FFT corresponding to the first OFDM symbol is calculated.
  • the processing result is that a plurality of subcarrier spacing OFDM symbols are processed by using one set of FFT windows, instead of performing FFT calculation according to respective FFT windows, thereby reducing the complexity of processing signals by the receiving end device.
  • the steps in the method of the embodiment of the present invention may be sequentially adjusted, merged, and deleted according to actual needs.
  • the units in the apparatus of the embodiment of the present invention may be combined, divided, and deleted according to actual needs.
  • the program may be stored in a computer readable storage medium, and the storage medium may include: Flash disk, Read-Only Memory (ROM), Random Access Memory (RAM), disk or optical disk.

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  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de traitement de signal. Un dispositif récepteur comprend un système radiofréquence (RF) et un processeur de bande de base, le système RF étant utilisé pour recevoir un signal de multiplexage par répartition orthogonale de la fréquence (OFDM) provenant d'une interface radio, et le processeur de bande de base étant utilisé pour recevoir le signal OFDM provenant du système RF. Une interception de fenêtre est effectuée sur des points d'échantillonnage de domaine temporel du signal OFDM selon M fenêtres de transformée de Fourier rapide (FFT) correspondant à un second intervalle de sous-porteuse pour obtenir N2 points d'échantillonnage de domaine temporel dans chaque fenêtre FFT ; une opération de calcul de FFT à N2 points est effectuée sur les N2 points d'échantillonnage de domaine temporel dans chaque fenêtre FFT pour obtenir N2 points d'échantillonnage de domaine fréquentiel correspondant à la fenêtre FFT ; un symbole de domaine fréquentiel d'un second symbole OFDM est obtenu à partir des N2 points d'échantillonnage de domaine fréquentiel selon un emplacement de ressource de domaine fréquentiel attribué au second symbole OFDM ; un symbole de domaine fréquentiel d'un premier symbole OFDM est obtenu à partir de N1 points d'échantillonnage de domaine fréquentiel dans les M fenêtres FFT selon un emplacement de ressource de domaine fréquentiel attribué au premier symbole OFDM. Des modes de réalisation de la présente invention peuvent réduire la complexité de traitement des signaux par le dispositif récepteur.
PCT/CN2016/101382 2016-09-30 2016-09-30 Procédé et dispositif de traitement de signal WO2018058678A1 (fr)

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CN116112329A (zh) * 2023-04-12 2023-05-12 高拓讯达(北京)微电子股份有限公司 一种ofdm接收机控制系统及方法
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