CN107040487B - Signal processing method and device - Google Patents

Signal processing method and device Download PDF

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CN107040487B
CN107040487B CN201610299153.XA CN201610299153A CN107040487B CN 107040487 B CN107040487 B CN 107040487B CN 201610299153 A CN201610299153 A CN 201610299153A CN 107040487 B CN107040487 B CN 107040487B
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data
time domain
version
constellation
pilot
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CN107040487A (en
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陈泽为
徐俊
许进
戴博
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ZTE Corp
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ZTE Corp
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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
    • H04L27/2614—Peak power aspects
    • H04L27/2615—Reduction thereof using coding
    • 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
    • H04L27/2614—Peak power aspects
    • H04L27/262—Reduction thereof by selection of pilot symbols
    • 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
    • H04L27/2614—Peak power aspects
    • H04L27/2621—Reduction thereof using phase offsets between subcarriers

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

Abstract

The invention provides a signal processing method and a signal processing device, wherein the method comprises the following steps: selecting a specified constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the specified constellation diagram version, and selecting a second phase rotation angle according to preset information, wherein phase rotation is performed on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle; wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version. The invention effectively reduces the PAPR of the transmitted signal and solves the problem that the PAPR is too high when the signal is transmitted in the related technology, thereby improving the power amplification efficiency of the transmitting terminal, saving the energy consumption of the terminal, achieving the effects of reducing the terminal cost and ensuring the signal coverage of the system.

Description

Signal processing method and device
Technical Field
The present invention relates to the field of communications, and in particular, to a signal processing method and apparatus.
Background
The peak-to-average ratio (PAR), also called the PAPR, is the ratio of the peak power to the average power of a signal. The peak-to-average ratio of the transmitted signal should be kept at a relatively low level. This is because too high peak-to-average ratio may cause the power amplifier to operate in a non-linear region, causing distortion of the signal and out-of-band leakage. To solve this problem, the transmitter usually employs a power back-off method. I.e. to let the power amplifier of the transmitter operate at an average power output level that is much lower than the peak power. Power back-off, while avoiding signal distortion, reduces the efficiency of the power amplifier, resulting in wasted energy. Another solution is to use a high linearity power amplifier with a larger dynamic range. However, such a power amplifier is often high in cost and price, and is generally used only on the base station side of the mobile communication system for transmitting downlink data; on the terminal side, due to cost constraints, only cheaper power amplifiers can be used for transmitting uplink data. The peak-to-average ratio of the uplink transmission signal must be reduced.
In the related art, a Single Carrier-Frequency Division multiple Access (SC-FDMA) technology is adopted in an uplink of a Long Term Evolution (LTE) standard and an LTE-a standard. In the SC-FDMA system, each ue uses a Discrete Fourier Transform (DFT) matrix as a precoding matrix to reduce the peak-to-average ratio of the transmission signal.
With the development of the technology of the Internet of things, the application of the narrowband Internet of things (NB-IOT: Narrow Band Internet of things) based on the LTE technology is emphasized, and the narrowband Internet of things are characterized in that the transmission bandwidth is small and is usually only 200 kHz; and the terminal requires lower energy consumption and cost.
Using pi/2BPSK (Binary Phase Shift Keying) and pi/4QPSK (Quaternary Phase Shift Keying) techniques, lower peak-to-average ratios can be achieved for BPSK and QPSK, respectively. The pi/2BPSK is modulated or symbol phase corrected by two BPSK constellations which rotate pi/2 relatively in different symbol periods respectively, so that the maximum phase jump of the carrier in the two symbol periods is reduced from 180 degrees to 90 degrees; and pi/4QPSK adopts two QPSK constellations which are relatively rotated by pi/4 in different symbol periods respectively, so that the maximum phase jump of the carriers of the two symbol periods is reduced from 180 degrees to 135 degrees. The signal is low-pass filtered before being transmitted, and the lower maximum phase jump between symbols is helpful for smoothing amplitude change between symbols, thereby reducing the PAPR of the transmitted signal.
However, the SC-FDMA technology of wideband LTE and LTE-a in the related art cannot meet the requirement of the NB-IOT terminal on the peak-to-average ratio, and the peak-to-average ratio of the uplink transmission signal must be further reduced.
Aiming at the problem that the peak-to-average ratio is too high when an NB-IOT terminal transmits signals in the related art, an effective solution is not found at present.
Disclosure of Invention
The invention provides a signal processing method and a signal processing device, which at least solve the problem that the peak-to-average power ratio (PAPR) is too high when a signal is sent in the related art.
According to an aspect of the present invention, there is provided a signal processing method including: selecting an appointed constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information; performing phase rotation on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle; wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version.
Further, the data type includes one of: data carrying information, pilot data.
Further, when the data type is data carrying information, a constellation map version of data of a first designated time domain resource unit in a first time domain resource is predefined or configured through signaling, wherein a time domain length of the first time domain resource is not less than a length of the first designated time domain resource unit, and the first time domain resource includes at least one of: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, the first designated time domain resource unit being at least one of: orthogonal frequency division multiplexing, OFDM, symbol, one subframe.
Further, when the data type is pilot data, a constellation version of data of a second time domain resource unit in a second time domain resource is predefined or configured through signaling, where a time domain length of the second time domain resource is not less than a length of the second time domain resource unit, and the second time domain resource includes at least one of: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, one slot, the second time domain resource unit comprising one of: an OFDM symbol.
Further, the temporal granularity of the data repetition comprises one of: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
Further, the selecting the specific constellation version according to the parameter information of the transmission signal includes at least one of: when the time domain granularity of the data repetition of the transmission signal is an OFDM symbol, the OFDM symbols carrying the same data in one repetition unit adopt the same constellation map version; when the time domain granularity of the data repetition of the transmission signal is an OFDM symbol, the constellation diagram version of the first OFDM symbol of the (i + 1) th repeating unit is different from the constellation diagram version of the last OFDM symbol of the ith repeating unit; when the time domain granularity of the data repetition of the transmission signal is a subframe, R OFDM symbols bearing the same data in one repetition unit adopt the same appointed constellation diagram version; when the time domain granularity of the data repetition of the transmission signal is a subframe, the version of the appointed constellation diagram of the first subframe of the (i + 1) th repeating unit is different from the version of the appointed constellation diagram of the last subframe of the (i) th repeating unit; when the repeated time domain granularity of the data of the transmission signal is a transmission time interval TTI, R OFDM symbols bearing the same data have the same constellation map version; wherein, R refers to the number of times of repeatedly sending the transmission block, and is a natural number; i is a positive integer.
Further, the signaling includes at least one of: radio resource control RRC signaling, downlink control information DCI, and system information block SIB signaling.
Further, the selecting the specific constellation version according to the parameter information of the transmission signal includes at least one of: when adjacent OFDM symbols of a transmission signal are pilot frequency data and/or data carrying information, and the modulation modes of the adjacent OFDM symbols are the same, the adjacent OFDM symbols select different specified constellation map versions; when adjacent OFDM symbols of a transmission signal are pilot data and/or information-bearing data and modulation modes of the adjacent OFDM symbols are different, the specified constellation version of the information-bearing data is a subset of the specified constellation version of the pilot, or the specified constellation version of the pilot is a subset of the specified constellation version of the information-bearing data; when adjacent OFDM symbols of a transmission signal are pilot frequency data and/or information-bearing data and the modulation modes of the adjacent OFDM symbols are different, the specified constellation map version of the information-bearing data and the specified constellation map version of the pilot frequency have no intersection.
Further, when the specified constellation version of the information-bearing data is a subset of the specified constellation version of the pilot, the method further includes: the subset of the designated constellation version of the pilot does not include the constellation point corresponding to the pilot data; and/or when the pilot modulation mode of the transmission signal is Quadrature Phase Shift Keying (QPSK) or phase shift keying (M-PSK) and the modulation mode of the information-bearing data is Binary Phase Shift Keying (BPSK), the version of the specified constellation diagram of the information-bearing data is a constellation diagram which is symmetrical about the center of the origin and does not include the pilot data, wherein M is a positive integer not less than 4.
Further, when the adjacent OFDM symbols of the transmission signal are pilot and/or information-bearing data and the modulation modes of the adjacent OFDM symbols are different, there is no intersection between the specified constellation version of the information-bearing data and the specified constellation version of the pilot, including: when the modulation mode of the pilot is BPSK and the modulation mode of the data carrying the information is QPSK, the specified constellation of the BPSK transmission signal is a subset of the constellation obtained by rotating the constellation of the QPSK transmission signal by a specified angle.
Further, the pilot data is obtained in one of the following ways: the pilot data is obtained by selecting from the constellation map version of the pilot according to a first designated sequence through a plurality of constellation points which are predefined on the constellation map version of the pilot or configured through signaling.
Further, the first specified sequence comprises a pseudo-random sequence.
Further, the selecting the specific constellation version according to the parameter information of the transmission signal includes at least one of: when the data of a transmission block for transmitting signals are mapped to N discontinuous segments of third time domain resources, the constellation diagram version of the data on the first time domain resource unit of the i +1 segment of time domain resources is determined according to the constellation diagram version of the data on the last time domain resource unit of the i segment of time domain resources; when data of a transmission block of a transmission signal is mapped to N discontinuous segments of third time domain resources, a specified constellation map version of the data on a time domain resource unit of the third time domain resources is consistent with a first specified constellation map version, wherein the first specified constellation map version is a constellation map version of corresponding data when the data of the transmission block is mapped to the continuous time domain resources; wherein N is an integer greater than 0, and i is an integer greater than 0.
Further, when the data type is pilot data, the method includes: and when the pilot frequency sequence is the second appointed sequence in the time domain, the pilot frequency sequence adopts the same constellation diagram version.
Further, the second designated sequence comprises: a constant envelope zero correlation CAZAC sequence or a sequence generated based on a CAZAC sequence.
Further, when the data type is pilot data, the method includes: when P continuous OFDM symbols of transmission signals bear pilot frequency, the pilot frequency borne by the P OFDM symbols of the transmission signals adopts the same first phase rotation angle, wherein P is an integer larger than 1.
Further, the same first phase rotation angle is determined according to a phase rotation angle of a first pilot or a last pilot of the pilots carried by the OFDM symbols of the consecutive P transmission signals.
Further, when the number of OFDM symbols continuously carrying the pilot is greater than 1, the pilot does not perform phase rotation, and/or when the number of OFDM symbols continuously carrying the pilot is equal to 1, both the pilot and the data perform phase rotation.
Further, the preset information includes at least one of: the signal transmission method comprises the steps of transmitting a signal, wherein the signal is transmitted by a first node, and the signal transmission method comprises the following steps of transmitting a subcarrier position of a carried information of the signal, a power amplifier type of the first node, the type of the first node and a second phase rotation angle configured by the signaling, wherein the first node is a terminal or a base station for transmitting the signal.
Further, the phase rotating the modulation symbols of the transmission signal in accordance with the first phase rotation angle and/or the second phase rotation angle comprises: adding a third phase rotation angle of the first and second phase rotation angles; rotating the phase angle of the time domain or frequency domain symbol of the transmission signal by the third phase rotation angle.
According to another aspect of the present invention, there is provided a signal processing apparatus including: the selection module is used for selecting an appointed constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information; a processing module, configured to perform phase rotation on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle; wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version.
Further, the data type includes one of: data carrying information, pilot data.
Further, the temporal granularity of the data repetition comprises one of: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
Further, the signaling includes at least one of: radio resource control RRC signaling, downlink control information DCI, and system information block SIB signaling.
Further, the position of the information-bearing subcarrier of the transmission signal, the power amplifier type of the first node, the type of the first node, and the second phase rotation angle configured by the signaling are determined, where the first node is a terminal or a base station transmitting the signal.
Further, when the data type is pilot data and when the OFDM symbols of P consecutive transmission signals carry pilots, the pilots carried by the OFDM symbols of the P transmission signals adopt the same first phase rotation angle, where P is an integer greater than 1.
Further, the same first phase rotation angle is determined according to a phase rotation angle of a first pilot or a last pilot of the pilots carried by the OFDM symbols of the consecutive P transmission signals.
Further, when the number of OFDM symbols continuously carrying the pilot is greater than 1, the pilot does not perform phase rotation, and/or when the number of OFDM symbols continuously carrying the pilot is equal to 1, both the pilot and the data perform phase rotation.
According to the invention, firstly, an appointed constellation diagram version is selected according to parameter information of a transmission signal, a first phase rotation angle corresponding to the appointed constellation diagram version is obtained, a second phase rotation angle is selected according to preset information, and then phase rotation is carried out on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle; wherein the parameter information comprises one or more of the following parameters: the data type, the modulation mode, the time domain granularity of data repetition, the constellation map version of signaling configuration and the predefined constellation map version effectively reduce the PAPR of a transmitted signal by rotating the phase of a modulation symbol of a transmission signal, and solve the problem that the PAPR is too high when the signal is transmitted in the related technology, thereby improving the power amplification efficiency of a transmitting terminal, saving the energy consumption of the terminal, reducing the cost of the terminal and ensuring the effect of system signal coverage.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flow chart of a signal processing method according to an embodiment of the present invention;
fig. 2 is a block diagram of a signal processing apparatus according to an embodiment of the present invention;
fig. 3 is a diagram of an OFDM symbol according to the present embodiment;
FIG. 4 is a diagram of a subframe according to an embodiment of the invention;
figure 5 is a schematic diagram of a TTI bearer according to an embodiment of the present invention;
fig. 6 is a first constellation diagram according to an embodiment of the present invention;
fig. 7 is a second constellation diagram according to an embodiment of the present invention;
fig. 8 is a diagram of an OFDM symbol according to the second embodiment.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In this embodiment, a signal processing method is provided, which may be applied to a terminal side and a network base station side, and may be applied to an NB-IOT system based on an LTE technology, specifically, a terminal supporting an NB-IOT function, where fig. 1 is a flowchart of the signal processing method according to an embodiment of the present invention, and as shown in fig. 1, the flowchart includes the following steps:
step S102, selecting an appointed constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information;
step S104, performing phase rotation on the time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle;
wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version.
Through the steps, firstly, according to parameter information of a transmission signal, a specified constellation diagram version is selected, a first phase rotation angle corresponding to the specified constellation diagram version is obtained, a second phase rotation angle is selected according to preset information, and then phase rotation is carried out on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle; wherein the parameter information comprises one or more of the following parameters: the data type, the modulation mode, the time domain granularity of data repetition, the constellation map version of signaling configuration and the predefined constellation map version effectively reduce the PAPR of a transmitted signal by rotating the phase of a modulation symbol of a transmission signal, and solve the problem that the PAPR is too high when the signal is transmitted in the related technology, thereby improving the power amplification efficiency of a transmitting terminal, saving the energy consumption of the terminal, reducing the cost of the terminal and ensuring the effect of system signal coverage.
Optionally, in the above parameters, the data type includes one of: data carrying information, pilot data. The temporal granularity of the data repetition comprises one of: orthogonal Frequency Division Multiplexing (OFDM) symbol-level repetition, subframe-level repetition, and multi-subframe-level repetition. The signaling includes at least one of: radio Resource Control (RRC) signaling, Downlink Control Information (DCI), and System Information Block (SIB) signaling.
In alternative embodiments according to this embodiment, both the information-bearing data and the pilot data may be determined by a predefined determination or by a signaling configuration. Wherein the content of the first and second substances,
when the data type is data carrying information, a constellation diagram version of data of a first designated time domain resource unit in first time domain resources is predefined or configured through signaling, wherein the time domain length of the first time domain resources is not less than the length of the first designated time domain resource unit, and the first time domain resources include at least one of the following: time domain resources of single transmission of one transmission block, time domain resources occupied by repeated transmission, one subframe, a plurality of subframes, and the first designated time domain resource unit is at least one of the following: orthogonal frequency division multiplexing, OFDM, symbol, one subframe.
When the data type is pilot data, a constellation diagram version of data of a second time domain resource unit in a second time domain resource is predefined or configured through signaling, wherein the time domain length of the second time domain resource is not less than the length of the second time domain resource unit, and the second time domain resource includes at least one of the following: time domain resources of a single transmission of a transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, one slot, the second time domain resource unit comprising one of: an OFDM symbol.
In this embodiment, selecting the specific constellation version according to the parameter information of the transmission signal includes multiple ways, which are only exemplified here:
when the time domain granularity of data repetition of a transmission signal is an OFDM symbol, the OFDM symbols carrying the same data in one repetition unit adopt the same constellation diagram version;
when the time domain granularity of data repetition of a transmission signal is an OFDM symbol, the constellation diagram version of the first OFDM symbol of the (i + 1) th repeating unit is different from the constellation diagram version of the last OFDM symbol of the ith repeating unit;
when the time domain granularity of data repetition of a transmission signal is a subframe, R OFDM symbols bearing the same data in one repetition unit adopt the same appointed constellation map version;
when the time domain granularity of data repetition of a transmission signal is a subframe, the version of a specified constellation diagram of a first subframe of an i +1 th repeating unit is different from the version of the specified constellation diagram of a last subframe of the i-th repeating unit;
when the Time domain granularity of data repetition of a Transmission signal is a Transmission Time Interval (TTI), R OFDM symbols carrying the same data have the same constellation version;
wherein, R refers to the number of times of repeatedly sending the transmission block, and is a natural number; i is a positive integer.
When the adjacent OFDM symbols of the transmission signal are pilot frequency data and/or data carrying information, and the modulation modes of the adjacent OFDM symbols are the same, the adjacent OFDM symbols select different specified constellation map versions;
when the adjacent OFDM symbols of the transmission signal are pilot frequency data and/or information-bearing data and the modulation modes of the adjacent OFDM symbols are different, the specified constellation map version of the information-bearing data is a subset of the specified constellation map version of the pilot frequency, or the specified constellation map version of the pilot frequency is a subset of the specified constellation map version of the information-bearing data;
when the adjacent OFDM symbols of the transmission signal are pilot frequency data and/or information-bearing data and the modulation modes of the adjacent OFDM symbols are different, the specified constellation diagram version of the information-bearing data and the specified constellation diagram version of the pilot frequency have no intersection;
when the data of a transmission block for transmitting signals are mapped to N discontinuous segments of third time domain resources, the constellation diagram version of the data on the first time domain resource unit of the i +1 segment of time domain resources is determined according to the constellation diagram version of the data on the last time domain resource unit of the i segment of time domain resources;
when the data of the transmission block of the transmission signal is mapped to the discontinuous N segments of third time domain resources, the appointed constellation map version of the data on the time domain resource unit of the third time domain resources is consistent with the first appointed constellation map version, wherein the first appointed constellation map version is the constellation map version of the corresponding data when the data of the transmission block is mapped to the continuous time domain resources;
wherein N is an integer greater than 0, and i is an integer greater than 0.
Optionally, when the specified constellation version of the data carrying the information is a subset of the specified constellation version of the pilot, an optional implementation of this embodiment further includes:
the subset of the designated constellation version of the pilot does not include constellation points corresponding to the pilot data; and/or when the pilot modulation mode of the transmission signal is Quadrature Phase Shift Keying (QPSK) or phase shift keying (M-PSK) and the modulation mode of the data carrying the information is Binary Phase Shift Keying (BPSK), the version of the specified constellation diagram of the data carrying the information is a constellation diagram which is symmetrical about the center of the origin and does not include the pilot data, wherein M is a positive integer not less than 4.
Optionally, when the adjacent OFDM symbols of the transmission signal are pilot and/or data carrying information, and the modulation modes of the adjacent OFDM symbols are different, there is no intersection between the specified constellation version of the data carrying information and the specified constellation version of the pilot, including: when the modulation mode of the pilot is BPSK and the modulation mode of the data carrying the information is QPSK, the specified constellation of the BPSK transmission signal is a subset of the constellation obtained by rotating the constellation of the QPSK transmission signal by a specified angle.
Optionally, the pilot data in this embodiment may be obtained in the following manner: the pilot data is obtained by selecting from the constellation map version of the pilot according to a first designated sequence through a plurality of constellation points which are predefined on the constellation map version of the pilot or configured through signaling. Wherein the first specified sequence may be a pseudo-random sequence.
In an optional embodiment, when the data type is pilot data, the method of this embodiment includes: and when the pilot frequency sequence is the second appointed sequence in the time domain, the pilot frequency sequence adopts the same constellation diagram version. The second ordered sequence may be: constant Amplitude Zero Auto-Correlation (CAZAC) sequence or a sequence generated based on CAZAC sequence.
In another optional embodiment, when the data type is pilot data, the method of this embodiment includes: when the OFDM symbols of P transmission signals carry pilots, the pilots carried by the OFDM symbols of P transmission signals adopt the same first phase rotation angle, where P is an integer greater than 1. In an alternative embodiment, the same first phase rotation angle is determined according to a phase rotation angle of a first pilot or a last pilot of pilots carried by OFDM symbols of the consecutive P transmission signals.
In another alternative embodiment, when the number of OFDM symbols continuously carrying the pilot is greater than 1, the pilot is not phase-rotated, and/or when the number of OFDM symbols continuously carrying the pilot is equal to 1, both the pilot and the data are phase-rotated.
Optionally, the preset information includes at least one of: the position of a subcarrier carrying information of a transmission signal, a power amplifier type of a first node, a type of the first node, and a second phase rotation angle configured by signaling are determined, where the first node is a terminal or a base station transmitting the signal, and the first node may be a main body implementing the method of this embodiment. The power amplifier types of the first node have different phase response functions, and influence on the phase of the input signal. The second phase rotation angle is used for counteracting the influence of the power amplifier on the signal phase. The type of the first node may be defined according to the power amplifier type of the first node, or may be defined according to whether the first node supports phase adjustment based on the second phase rotation angle. Selecting the phase rotation angle of the transmission signal according to the one or more pieces of preset information, that is, the second phase rotation angle in this embodiment, is directly implemented by a person skilled in the art through analysis according to the prior art, and is not described herein again.
In an alternative implementation according to this embodiment, phase rotating the modulation symbols of the transmission signal in dependence on the first phase rotation angle and/or the second phase rotation angle comprises:
s11, adding the first phase rotation angle and the second phase rotation angle to form a third phase rotation angle;
s12, the phase angle of the time domain or frequency domain symbol of the transmission signal is rotated by a third phase rotation angle.
Through the above description of the embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal device (such as a mobile phone, a computer, a server, or a network device) to execute the method according to the embodiments of the present invention.
In this embodiment, a signal processing apparatus is further provided, and the apparatus is used to implement the foregoing embodiments and optional embodiments, which have already been described and are not described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the means described in the embodiments below are preferably implemented in software, an implementation in hardware, or a combination of software and hardware is also possible and contemplated.
Fig. 2 is a block diagram of a signal processing apparatus according to an embodiment of the present invention, which may be disposed on a terminal side or a network side device, as shown in fig. 2, and includes:
the selection module 20 is configured to select an appointed constellation version according to parameter information of a transmission signal, obtain a first phase rotation angle corresponding to the appointed constellation version, and select a second phase rotation angle according to preset information;
a processing module 22, configured to perform phase rotation on a time domain symbol or a frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle;
wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition and signaling type.
The data type includes one of: data carrying information, pilot data.
Optionally, the time-domain granularity of the data repetition includes one of: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
Optionally, the signaling includes at least one of: radio resource control RRC signaling, downlink control information DCI, and system information block SIB signaling.
Optionally, the position of the information-bearing subcarrier of the transmission signal, the power amplifier type of the first node, the type of the first node, and the second phase rotation angle configured by the signaling are selected, where the first node is a terminal or a base station for transmitting the signal.
Optionally, when the data type is pilot data and when the OFDM symbols of the consecutive P transmission signals carry pilots, the pilots carried by the OFDM symbols of the P transmission signals adopt the same first phase rotation angle, where P is an integer greater than 1.
Optionally, the same first phase rotation angle is determined according to a phase rotation angle of a first pilot or a last pilot of pilots carried by OFDM symbols of the consecutive P transmission signals.
Optionally, when the number of OFDM symbols continuously carrying the pilot is greater than 1, the pilot does not perform phase rotation, and when the number of OFDM symbols continuously carrying the pilot is equal to 1, both the pilot and the data perform phase rotation.
It should be noted that the steps in the above method embodiments are also provided in the signal processing apparatus shown in fig. 2 in the form of units or sub-modules, and correspond to the method, and can realize the same functions.
The following description is made in connection with an alternative embodiment according to the invention:
in this embodiment, the implementation subject may be a terminal, and may also be a base station.
In an NB-IOT system based on an LTE technology, a terminal supporting NB-IOT needs to reduce energy waste as much as possible when transmitting signals, and the efficiency of power amplification is improved. The peak-to-average power ratio (PAPR) of the existing SC-FDMA of LTE uplink cannot meet the requirement of an NB-IOT terminal, and the PAPR must be further reduced.
The modulation mode of single carrier uplink transmission of the NB-IOT system comprises the following steps: pi/2BPSK and pi/4 QPSK. The pi/2BPSK is modulated or symbol phase corrected by two BPSK constellations which rotate pi/2 relatively in different symbol periods respectively, so that the maximum phase jump of the carrier in the two symbol periods is reduced from 180 degrees to 90 degrees; and pi/4QPSK adopts two QPSK constellations which are relatively rotated by pi/4 in different symbol periods respectively, so that the maximum phase jump of the carriers of the two symbol periods is reduced from 180 degrees to 135 degrees. The signal is low-pass filtered before being transmitted, and the lower maximum phase jump between symbols is helpful for smoothing amplitude change between symbols, thereby reducing the PAPR of the transmitted signal. In this patent, BPSK, pi/2BPSK and other similar pi/2BPSK, but modulation modes with different constellation rotation angles are called BPSK modulation modes; QPSK, pi/4QPSK and other modulation schemes similar to pi/4QPSK but with different constellation rotation angles are called QPSK modulation schemes. In this embodiment, the BPSK constellations such as the two relative rotation pi/2 are different constellation versions of the BPSK constellation, the QPSK constellations of the two relative rotation pi/4 are different constellation versions of the QPSK constellation, and one constellation version can be rotated to obtain the other constellation version.
In the NB-IOT system, the bandwidth of the system is only 200kHz, which is calculated at 15k subcarrier intervals, and the number of available subcarriers is 12 after dividing by 20k guard bandwidth. In an NB-IOT system, a terminal performs frequency domain scheduling with one or more consecutive subcarriers in an uplink direction with one or more uplink subframes as a time domain scheduling period. In the case of a low signal-to-noise ratio, the terminal needs to repeat data transmission for many times. It can be assumed that data transmission of one transport block needs to occupy Ns subframes, total Nsym Ns OFDM symbols, and repeatedly transmit R times, so that the total number of occupied OFDM symbols is Nsym Ns R, where Nsym is the number of OFDM symbols used for carrying data in one subframe.
Optionally, the method may be divided into the following according to different data repetition modes or repeated time domain resource granularity: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
OFDM symbol level repetition. All OFDM symbol resources occupied by the transmission block are divided into Nsym Ns groups according to the time sequence, each group is provided with R OFDM symbols, the R symbols of each group bear the same data, namely the data on one OFDM symbol repeatedly transmitted by the transmission block at one time, and different groups bear the data on different OFDM symbols repeatedly transmitted by the transmission block at one time. For OFDM symbol level repetition, one group of every R symbols is a repetition unit.
The subframe level repeats. All OFDM symbol resources occupied by the transmission block are divided into Ns groups according to the time sequence, each group is provided with R × Nsym OFDM symbols, namely R subframes, each group of R subframes bears the same data, and each group of R subframes bears the data on one subframe repeatedly transmitted by the transmission block at one time. Different groups carry data on different subframes of one-time repeated transmission of the transmission block. For subframe level repetition, one group of every R subframes is a repetition unit.
TTI-level repetition. All OFDM symbol resources occupied by the transmission block are divided into R groups according to the time sequence, each group has Nsym Ns OFDM symbols, namely a TTI, and each group bears all data repeatedly transmitted by the transmission block once. Different groups repeat all data of the TBS. For TTI-level repetition, the above R TTIs are a repeating unit.
The detailed description is made herein with reference to specific examples of the present embodiment:
example one:
sub-examples 1.1
In this embodiment, the NB-IoT terminal transmits uplink data through the NB-PUSCH. The terminal repeatedly transmits one transmission block at the OFDM symbol level, R is repeated for 3 times in total, and the modulation mode is QPSK. The modulation scheme for the pilot is also QPSK. In this embodiment, Nsym equals 12, Ns equals 12, and a total of 432 OFDM symbols are occupied by Nsym × Ns × R repeated 3 times. The 432 OFDM symbols are divided into Nsym Ns 144 groups. Fig. 3 is a schematic diagram of an OFDM symbol according to the first embodiment, and as shown in fig. 3, fig. 3 only shows 14 OFDM symbols in two slots of 1 subframe, where a pilot occupies the 4 th symbol of the two slots, and other symbols are data carrying information. Data 1/2/3/4 is 4 of 144 groups, with 3 copies of the OFDM symbol in each group. The data 1/3 adopts a QPSK constellation Con1 specified in Rel-12 LTE protocol 36.211, and the data 2/4 adopts a constellation Con2 obtained by rotating Con1 by pi/4 angle. The constellation of the pilots P1 and P2 is predefined or configured through SIB/RRC signaling as P1.
The 3 OFDM copies within data 1/2/3/4 use the same constellation version, while the adjacent data, such as data 1/2,2/3,3/4, use different constellation versions, and the pilots are predefined or configured by signaling as fixed constellation versions. The benefits of such a design are: 1. the configuration of the pilot frequency is simple. Furthermore, if pilot data on different OFDM symbols in the time domain constitute a ZC sequence, the pilots may adopt the same constellation version in order to maintain the autocorrelation characteristics of the ZC sequence. 2. The constellation versions between data 1/2/3/4 are switched between the two constellations, the switching is only dependent on the data itself and not on whether there is pilot separation between the data after actual mapping, and the implementation is simpler. And also reduces the probability of the phase jump angle between OFDM symbols being 180 degrees. Therefore, the PAPR for sending data is reduced, the power amplifier efficiency can be effectively improved, the energy consumption is saved, the cost is reduced, and the coverage is ensured.
Sub-examples 1.2
In this embodiment, the NB-IoT terminal transmits uplink data through the NB-PUSCH. The terminal repeatedly transmits a transport block at the subframe level, wherein the total repetition R is 3 times, and the modulation mode is QPSK. The modulation scheme for the pilot is also QPSK. In this embodiment, Ns is 12, and Ns × R is 36 subframes in total occupied by 3 times. The 36 OFDM symbols are divided into Ns groups. Each group having R subframes. Fig. 4 is a diagram of subframes according to an embodiment of the present invention, and fig. 4 shows 10 subframes in a radio frame. As shown in fig. 4, data 1/2/3/4 is Ns — 4 of 12 groups, where each group has 3 copies of a subframe, and 3 copies are a repeating unit. The same OFDM symbol position of each set of 3 subframes carries the same data and has the same constellation version. While the constellation version of the last OFDM symbol of subframe 3 has a different constellation version than the first OFDM symbol of subframe 4, this embodiment assumes that both OFDM symbols are information-bearing data. Similarly, the constellation version of the last OFDM symbol of subframe 6 has a different constellation version than the first OFDM symbol of subframe 7; the constellation version of the last OFDM symbol of sub-frame 9 has a different constellation version than the first OFDM symbol of sub-frame 10.
In fact, when the terminal performs data processing on the transmitting side, modulation symbols of one copy of one transport block are generated through coded modulation, and the modulation symbols belong to Ns × Nsym OFDM symbols. The terminal makes the data carrying information on adjacent OFDM symbols have different constellation map versions. Then the terminal maps the copy to Ns Nsym R OFDM symbols according to a certain rule so as to obtain R copies of the transmission block. Such a design is characterized by simple data processing. And also reduces the probability of the phase jump angle between OFDM symbols being 180 degrees. Therefore, the PAPR for sending data is reduced, the power amplifier efficiency can be effectively improved, the energy consumption is saved, the cost is reduced, and the coverage is ensured.
Sub-examples 1.3
In this embodiment, the NB-IoT terminal transmits uplink data through the NB-PUSCH. Fig. 5 is a schematic diagram of TTI bearer according to an embodiment of the present invention, and as shown in fig. 5, the terminal repeatedly transmits one transport block at TTI level, where R is repeated 3 times in total, and the modulation scheme is QPSK. The modulation scheme for the pilot is also QPSK. In this embodiment, three TTIs have the same constellation version on the OFDM symbol carrying the same data.
In this embodiment, when the terminal performs data processing on the transmitting side, modulation symbols of one transport block and one replica are generated by code modulation, and these modulation symbols are mapped onto Ns × Nsym OFDM symbols. The terminal makes the data carrying information on adjacent OFDM symbols have different constellation map versions. Then the terminal maps the copy to Ns Nsym R OFDM symbols according to a certain rule so as to obtain R copies of the transmission block. Such a design is characterized by simple data processing. And also reduces the probability of the phase jump angle between OFDM symbols being 180 degrees. Therefore, the PAPR for sending data is reduced, the power amplifier efficiency can be effectively improved, the energy consumption is saved, the cost is reduced, and the coverage is ensured.
Example two
Sub-examples 2.1
In this embodiment, the NB-IoT terminal transmits uplink data through the NB-PUSCH. The terminal uses BPSK modulation mode to modulate data, and the pilot frequency uses QPSK modulation mode. Fig. 6 is a first constellation diagram according to an embodiment of the present invention, and as shown in fig. 6, the Poit1 is pilot data, and in order to avoid the maximum phase jump of the adjacent information-carrying data being too large, the constellation diagram Con3 of the information-carrying data on the OFDM symbol adjacent to the pilot is a subset of the pilot constellation diagram Con4, but the Poit1 is not on Con 3. This may change the maximum phase jump of the pilot and information data from 180 degrees to 90 degrees. Therefore, the PAPR for sending data is reduced, the power amplifier efficiency can be effectively improved, the energy consumption is saved, the cost is reduced, and the coverage is ensured.
Sub-examples 2.2
In this embodiment, the NB-IoT terminal transmits uplink data through the NB-PUSCH. The terminal uses QPSK modulation mode to modulate data, and the pilot frequency uses BPSK modulation mode. Fig. 7 is a second constellation diagram according to an embodiment of the present invention, and as shown in fig. 7, the Poit1 is pilot data, and in order to avoid an excessive maximum phase jump of adjacent information-carrying data, the pilot constellation Con5 is a subset of the constellation Con7 obtained by rotating the constellation Con6 of information data on OFDM symbols adjacent to pilots by 45 degrees counterclockwise, so that the Poit1 is not on Con 6. This may change the maximum phase jump of the pilot and information data from 180 degrees to 135 degrees. Therefore, the PAPR for sending data is reduced, the power amplifier efficiency can be effectively improved, the energy consumption is saved, the cost is reduced, and the coverage is ensured.
Example three
Sub-example 3.1
In this embodiment, the NB-IoT terminal transmits uplink data through NB-PUSCH at 3.75kHz subcarrier intervals, and performs single carrier configuration. The frequency domain resources occupied by the terminal belong to LTE system resources, because the LTE terminal adopts 15kHz subcarrier intervals for uplink data transmission, the NB-IoT terminal and the LTE terminal interfere with each other. In this embodiment, to avoid interference on the LTE uplink reference signal, the fourth OFDM symbol (punctured OFDM symbol) of the NB-IoT terminal does not send data as a guard interval, so that the NB-IoT information-bearing data is discontinuous in the time domain. The terminal repeatedly transmits one transmission block at the OFDM symbol level, R is repeated for 3 times in total, and the modulation mode is QPSK. The modulation scheme for the pilot is also QPSK. Fig. 8 is a schematic diagram of an OFDM symbol according to the second embodiment, and as shown in fig. 8, a truncated OFDM symbol is located between OFDM symbol copies of data 1 and data 3, but the same constellation version is still used for the 3 OFDM copies of data 1 and data 3 on both sides of the truncated OFDM symbol. Likewise, the OFDM symbol replicas of data 2 on both sides of pilot P2 also use the same constellation version. In this embodiment, the data 1/3 is obtained by using a QPSK constellation Con1 specified in the Rel-12 LTE protocol 36.211, and the constellation Con2 used in the data 2/4 is obtained by rotating the Con1 by pi/4 degrees.
Different copies of the same OFDM symbol data of one transmission block adopt the same constellation diagram, and the constellation diagram versions of the different OFDM symbol data of the transmission block are determined before resource mapping, which is beneficial to simplifying the data processing of a sending end and the processing of a receiving side. Of course, if the OFDM symbols on both sides of the processed OFDM symbol belong to different data, such as different data of one transmission block or data of different transmission blocks, the two symbols may use different constellation versions.
Example four
The present embodiment considers the selection of pilot data. Example two sub-embodiment 2.1, the selection of pilot data may be configured as a fixed complex constellation point on a constellation diagram, such as Poit1 of fig. 6, by protocol definition or signaling. If different constellation versions are used, the Poit1 is also rotated by the phase rotation angle of the corresponding constellation. In general, it can be defined as that point on the constellation diagram corresponding to a specified complex number. Or a scrambling code sequence is generated, the scrambling code sequence can be a pseudo-random sequence, and the constellation points of the pilot frequency on different OFDM symbols are selected according to bits of the pseudo-random sequence. For example, the pseudo-random sequence is c (N), N ═ 0,1,2 … … N-1. Wherein c (N) is 0 or 1, and N is the length of the pseudo-random sequence. When the pilot frequency adopts a QPSK modulation mode, bit combinations 00/01/10/11 with different pseudo-random sequences respectively correspond to four constellation points on a QPSK constellation diagram; similarly, when the pilot frequency adopts BPSK modulation mode, the bit combinations 0/1 with different pseudo random sequences respectively correspond to two constellation points on the BPSK constellation diagram.
Example five
In this embodiment, after the NB-IoT terminal selects the corresponding constellation versions of different OFDM symbols, the data needs to be processed. The present embodiment provides two data processing methods. The method comprises the following steps: and the terminal scrambles and modulates the coded data according to the LTE SC-OFDM uplink processing flow. The constellation used in the modulation is the constellation with the phase rotation completed. Modulation according to the rotated constellation diagram is naturally equivalent to rotating the symbol according to a known rotation angle. During modulation, the corresponding constellation diagram version should be selected according to the mapping relationship between the bit sequence and the OFDM symbol. And performing physical resource mapping after modulation. The method 2 comprises the following steps: and the terminal scrambles, modulates and maps physical resources on the coded data according to the LTE SC-OFDM uplink processing flow, and then performs phase rotation on the data on the corresponding OFDM symbol according to the known rotation angle.
Example six
Sub-example 6.1
In this embodiment, 1 slot has 7 OFDM symbols, which are numbered #0,1,2 …, and 6, respectively. OFDM symbols # 0-2 carry the same pilot, and OFDM symbols # 3-6 carry non-pilot data. In the prior art, different constellation versions and phase rotation angles are used for adjacent OFDM symbols, that is, BPSK complex data of an OFDM symbol is multiplied by a phase rotation factor of g (n) ═ exp (j × pi/2 × mod (n,2)), where n is the number of the OFDM symbol. In the present embodiment, each symbol is multiplied by a phase rotation factor of (k) (n) ═ s (mod (n,7)) × (n). Wherein, s (m) takes a value of 0-6, two symbols after the pilot, namely the OFDM symbol #1/2 takes exp (j × pi/2 × mod (n0,2)) × conj (exp (j × pi/2 × mod (n,2))), otherwise takes 1. Here, conj denotes taking the conjugate, and n0 is the number of the OFDM symbol where the first symbol of the pilot is located. In this embodiment, n0 is 0. Thus, s is {1, -j,1,1,1,1,1}, g is {1, j,1, j,1, j,1}, and k is {1,1,1, j,1, j,1 }.
For the same continuously transmitted pilot frequency, the same constellation diagram version and the corresponding same phase rotation angle are adopted, and other data still carry out corresponding phase rotation, so that the PAPR can be reduced.
In this embodiment, the phase rotation may not be performed on the pilots on OFDM symbols # 0-2, i.e., the phase rotation factor is 1; while the other OFDM symbols are still multiplied by the phase rotation factor of g (n).
In this embodiment, the pilot may also be QPSK data, and the corresponding phase rotation factor is k (n) ═ s (mod (n,7)) × g (n), where g (n) ═ exp (j) · pi/4 × mod (n,2)), and s (m) (whose value is 0 to 6), and two symbols after the pilot, that is, OFDM symbol #1/2, takes exp (j ·/2 · mod (n0,2)) ] conj (g (n)), otherwise takes 1.
Sub-example 6.2
The difference between this embodiment and sub-embodiment 6.1 is that the OFDM symbol where the pilot is located is different. In this embodiment, OFDM symbols # 2-4 carry the same pilot, and OFDM symbols # 0-1 and # 5-6 carry non-pilot data. In this embodiment, n0 is 2, s is {1,1,1, -j,1, 1}, g is {1, j,1, j,1}, and k is {1, j,1,1,1, j,1 }.
Sub-example 6.3
The present embodiment assumes PUSCH transmission in NB-IoT with 3.75kHz subcarrier spacing configuration. The 1 slot has 7 OFDM symbols, numbered #0,1,2 …,6, respectively. OFDM symbols # 0-2 carry the same pilot, and OFDM symbols # 3-6 carry non-pilot data. In the prior art, different constellation versions and phase rotation angles are used for adjacent OFDM symbols, that is, BPSK complex data of an OFDM symbol is multiplied by a phase rotation factor of g (n) ═ exp (j) · pi/2 × m), where m ═ mod (n,2) and n is the number of the OFDM symbol.
In this embodiment, when the non-pilot data transmitted on the PUSCH is ACK/NACK information and n is 1, m is 0; when the non-pilot data transmitted by the PUSCH is ACK/NACK information and n is not equal to 1, m is mod (n, 2);
when the non-pilot data transmitted by the PUSCH is other data, m is mod (n,2) and n is the number of the OFDM symbol.
In this embodiment, the ACK/NACK information may also be other uplink control information.
Sub-example 6.4
The present embodiment assumes PUSCH transmission in NB-IoT with 15kHz subcarrier spacing configuration. OFDM symbols # 2-4 carry the same pilot, and OFDM symbols # 0-1 and # 5-6 carry non-pilot data.
In this embodiment, when the non-pilot data transmitted on the PUSCH is ACK/NACK information and n is 3, m is 0; when the non-pilot data transmitted by the PUSCH is ACK/NACK information and n is not equal to 3, m is mod (n, 2);
when the non-pilot data transmitted by the PUSCH is other data, m is mod (n,2) and n is the number of the OFDM symbol.
In this embodiment, the ACK/NACK information may also be other uplink control information.
The LTE NB-IOT system data transceiving solution provided in this embodiment selects the constellation version of data according to the data type, modulation scheme, and system configuration, thereby effectively reducing the PAPR of the transmitted signal, improving the power amplification efficiency of the terminal, saving the energy consumption of the terminal, reducing the cost of the terminal, and ensuring the coverage of the system.
It should be noted that the method steps in the above method embodiments may be provided in the signal processing apparatus of this embodiment by means of units, and implement the corresponding functions.
It should be noted that, the above modules may be implemented by software or hardware, and for the latter, the following may be implemented, but not limited to: the modules are all positioned in the same processor; alternatively, the modules are respectively located in a plurality of processors.
The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the storage medium may be configured to store program codes for performing the following steps:
s1, selecting an appointed constellation diagram version according to the parameter information of the transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information;
s2, phase-rotating the time domain or frequency domain symbols of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle.
Optionally, in this embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Optionally, in this embodiment, the processor executes, according to a program code stored in the storage medium, selecting a specified constellation version according to parameter information of the transmission signal, and obtains a first phase rotation angle corresponding to the specified constellation version, and selects a second phase rotation angle according to preset information;
alternatively, in this embodiment, the processor performs phase rotation of the time domain or frequency domain symbols of the transmission signal in accordance with the first phase rotation angle and/or the second phase rotation angle in accordance with program code stored in the storage medium.
Optionally, the specific examples in this embodiment may refer to the examples described in the above embodiments and optional implementation manners, and this embodiment is not described herein again.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (24)

1. A signal processing method, comprising:
selecting an appointed constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information;
performing phase rotation on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle;
wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version;
wherein the data type includes at least one of: data carrying information and pilot frequency data;
when the data type is data carrying information, a constellation diagram version of data of a first designated time domain resource unit in first time domain resources is predefined or configured through signaling, wherein the time domain length of the first time domain resources is not less than the length of the first designated time domain resource unit, and the first time domain resources include at least one of the following: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, the first designated time domain resource unit being at least one of: an orthogonal frequency division multiplexing, OFDM, symbol, one subframe;
when the data type is pilot data, a constellation map version of data of a second time domain resource unit in a second time domain resource is predefined or configured through signaling, wherein the time domain length of the second time domain resource is not less than the length of the second time domain resource unit, and the second time domain resource includes at least one of the following: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, one slot, the second time domain resource unit comprising one of: an OFDM symbol.
2. The method of claim 1, wherein the temporal granularity of the data repetition comprises one of: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
3. The method of claim 2, wherein selecting the specific constellation version according to the parameter information of the transmission signal comprises at least one of:
when the time domain granularity of the data repetition of the transmission signal is an OFDM symbol, the OFDM symbols carrying the same data in one repetition unit adopt the same constellation map version;
when the time domain granularity of the data repetition of the transmission signal is an OFDM symbol, the constellation diagram version of the first OFDM symbol of the (i + 1) th repeating unit is different from the constellation diagram version of the last OFDM symbol of the ith repeating unit;
when the time domain granularity of the data repetition of the transmission signal is a subframe, R OFDM symbols bearing the same data in one repetition unit adopt the same appointed constellation diagram version;
when the time domain granularity of the data repetition of the transmission signal is a subframe, the version of the appointed constellation diagram of the first subframe of the (i + 1) th repeating unit is different from the version of the appointed constellation diagram of the last subframe of the (i) th repeating unit;
when the repeated time domain granularity of the data of the transmission signal is a transmission time interval TTI, R OFDM symbols bearing the same data have the same constellation map version;
wherein, R refers to the number of times of repeatedly sending the transmission block, and is a natural number; i is a positive integer.
4. The method of claim 1, wherein the signaling comprises at least one of: radio resource control RRC signaling, downlink control information DCI, and system information block SIB signaling.
5. The method of claim 1, wherein selecting the specific constellation version according to the parameter information of the transmission signal comprises at least one of:
when adjacent OFDM symbols of a transmission signal are pilot frequency data and/or data carrying information, and the modulation modes of the adjacent OFDM symbols are the same, the adjacent OFDM symbols select different specified constellation map versions;
when adjacent OFDM symbols of a transmission signal are pilot data and/or information-bearing data and modulation modes of the adjacent OFDM symbols are different, the specified constellation version of the information-bearing data is a subset of the specified constellation version of the pilot, or the specified constellation version of the pilot is a subset of the specified constellation version of the information-bearing data;
when adjacent OFDM symbols of a transmission signal are pilot frequency data and/or information-bearing data and the modulation modes of the adjacent OFDM symbols are different, the specified constellation map version of the information-bearing data and the specified constellation map version of the pilot frequency have no intersection.
6. The method of claim 5, wherein when the specified constellation version of the information-bearing data is a subset of the specified constellation version of the pilot, the method further comprises:
the subset of the designated constellation version of the pilot does not include the constellation point corresponding to the pilot data; and/or
When the pilot modulation mode of the transmission signal is Quadrature Phase Shift Keying (QPSK) or phase shift keying (M-PSK), and the modulation mode of the information-bearing data is Binary Phase Shift Keying (BPSK), the version of the specified constellation diagram of the information-bearing data is a constellation diagram which is symmetric about the center of the origin and does not include the pilot data, wherein M is a positive integer not less than 4.
7. The method according to claim 5, wherein when the adjacent OFDM symbols of the transmission signal are pilot and/or information-carrying data and the modulation schemes of the adjacent OFDM symbols are different, there is no intersection between the specified constellation version of the information-carrying data and the specified constellation version of the pilot, including:
when the modulation mode of the pilot is BPSK and the modulation mode of the data carrying the information is QPSK, the specified constellation of the BPSK transmission signal is a subset of the constellation obtained by rotating the constellation of the QPSK transmission signal by a specified angle.
8. The method of claim 5, wherein the pilot data is obtained by one of:
the pilot data is obtained by selecting from the constellation map version of the pilot according to a first designated sequence through a plurality of constellation points which are predefined on the constellation map version of the pilot or configured through signaling.
9. The method of claim 8, wherein the first specified sequence comprises a pseudo-random sequence.
10. The method of claim 1, wherein selecting the specific constellation version according to the parameter information of the transmission signal comprises at least one of:
when the data of a transmission block for transmitting signals are mapped to N discontinuous segments of third time domain resources, the constellation diagram version of the data on the first time domain resource unit of the i +1 segment of time domain resources is determined according to the constellation diagram version of the data on the last time domain resource unit of the i segment of time domain resources;
when data of a transmission block of a transmission signal is mapped to N discontinuous segments of third time domain resources, a specified constellation map version of the data on a time domain resource unit of the third time domain resources is consistent with a first specified constellation map version, wherein the first specified constellation map version is a constellation map version of corresponding data when the data of the transmission block is mapped to the continuous time domain resources;
wherein N is an integer greater than 0, and i is an integer greater than 0.
11. The method of claim 1, wherein when the data type is pilot data, the method comprises: and when the pilot frequency sequence is the second appointed sequence in the time domain, the pilot frequency sequence adopts the same constellation diagram version.
12. The method of claim 11, wherein the second ordered sequence comprises: a constant envelope zero correlation CAZAC sequence or a sequence generated based on a CAZAC sequence.
13. The method of claim 1, wherein when the data type is pilot data and when P consecutive OFDM symbols of the transmission signals carry pilots, the pilots carried by the OFDM symbols of the P transmission signals use the same first phase rotation angle, wherein P is an integer greater than 1.
14. The method according to claim 13, wherein the same first phase rotation angle is determined according to the phase rotation angle of the first or the last of the pilots carried by the OFDM symbols of the consecutive P transmission signals.
15. Method according to claim 1, wherein the pilots are not phase rotated when the number of OFDM symbols carrying pilots continuously is larger than 1 and/or wherein both the pilots and the data are phase rotated when the number of OFDM symbols carrying pilots continuously is equal to 1.
16. The method of claim 1, wherein the preset information comprises at least one of:
the signal transmission method comprises the steps of transmitting a signal, wherein the signal is transmitted by a first node, and the signal transmission method comprises the following steps of transmitting a subcarrier position of a carried information of the signal, a power amplifier type of the first node, the type of the first node and a second phase rotation angle configured by the signaling, wherein the first node is a terminal or a base station for transmitting the signal.
17. The method according to claim 1, wherein said phase rotating the modulation symbols of the transmission signal in dependence of the first and/or second phase rotation angle comprises:
adding a third phase rotation angle of the first and second phase rotation angles;
rotating the phase angle of the time domain or frequency domain symbol of the transmission signal by the third phase rotation angle.
18. A signal processing apparatus, characterized by comprising:
the selection module is used for selecting an appointed constellation diagram version according to parameter information of a transmission signal, obtaining a first phase rotation angle corresponding to the appointed constellation diagram version, and selecting a second phase rotation angle according to preset information;
a processing module, configured to perform phase rotation on a time domain or frequency domain symbol of the transmission signal according to the first phase rotation angle and/or the second phase rotation angle;
wherein the parameter information comprises one or more of the following parameters: data type, modulation mode, time domain granularity of data repetition, constellation diagram version of signaling configuration and predefined constellation diagram version;
wherein the data type includes at least one of: data carrying information and pilot frequency data;
when the data type is data carrying information, a constellation diagram version of data of a first designated time domain resource unit in first time domain resources is predefined or configured through signaling, wherein the time domain length of the first time domain resources is not less than the length of the first designated time domain resource unit, and the first time domain resources include at least one of the following: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, the first designated time domain resource unit being at least one of: an orthogonal frequency division multiplexing, OFDM, symbol, one subframe;
when the data type is pilot data, a constellation map version of data of a second time domain resource unit in a second time domain resource is predefined or configured through signaling, wherein the time domain length of the second time domain resource is not less than the length of the second time domain resource unit, and the second time domain resource includes at least one of the following: time domain resources of a single transmission of one transport block, time domain resources occupied by repeated transmissions, one subframe, a plurality of subframes, one slot, the second time domain resource unit comprising one of: an OFDM symbol.
19. The apparatus of claim 18, wherein the temporal granularity of the data repetition comprises one of: OFDM symbol level repetition, subframe level repetition, multi-subframe level repetition.
20. The apparatus of claim 18, wherein the signaling comprises at least one of: radio resource control RRC signaling, downlink control information DCI, and system information block SIB signaling.
21. The apparatus of claim 18, wherein the information-bearing subcarrier position of the transmission signal, a power amplifier type of a first node, a type of the first node, and a second phase rotation angle of the signaling configuration are determined, and wherein the first node is a terminal or a base station that transmits the signal.
22. The apparatus of claim 18, wherein when the data type is pilot data and when P consecutive OFDM symbols of the transmission signals carry pilots, the pilots carried by the OFDM symbols of the P transmission signals use the same first phase rotation angle, wherein P is an integer greater than 1.
23. The apparatus of claim 22, wherein the same first phase rotation angle is determined according to a phase rotation angle of a first pilot or a last pilot of pilots carried by OFDM symbols of the consecutive P transmission signals.
24. The apparatus of claim 18, wherein the pilot is not phase rotated when the number of OFDM symbols continuously carrying the pilot is greater than 1, and/or wherein both the pilot and the data are phase rotated when the number of OFDM symbols continuously carrying the pilot is equal to 1.
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