CN110474860B - OFDM baseband signal generation method and device - Google Patents

OFDM baseband signal generation method and device Download PDF

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CN110474860B
CN110474860B CN201810451292.9A CN201810451292A CN110474860B CN 110474860 B CN110474860 B CN 110474860B CN 201810451292 A CN201810451292 A CN 201810451292A CN 110474860 B CN110474860 B CN 110474860B
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baseband signal
ofdm baseband
ssb
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CN110474860A (en
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吴凯
刘思綦
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Vivo Mobile Communication Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset

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Abstract

The embodiment of the invention provides a method and a device for generating an OFDM baseband signal, relates to the field of communication, and aims to solve the problem of phase deviation of the existing OFDM baseband signal. The method comprises the following steps: obtaining a difference value between the first frequency and the second frequency; the first frequency is the central frequency of the frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one of the M OFDM baseband signals corresponding to the first OFDM symbol; determining a phase offset corresponding to the first OFDM baseband signal according to the difference value and time domain information corresponding to the first OFDM symbol; and generating the first OFDM baseband signal according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.

Description

OFDM baseband signal generation method and device
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for generating an Orthogonal Frequency Division Multiplexing (OFDM) baseband signal.
Background
Currently, in 5G NR systems, the subcarrier spacing SCS (subcarrier spacing) of the Common resource block (Common RB) carried on a carrier may be set to 15 ^ 2 n kHz, where n may take a negative number. That is, in the NR system, SCS may be set to: 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz and the like. Meanwhile, the existing 5G NR system supports the simultaneous transmission of the OFDM baseband signals of different SCS within the same carrier, that is, different SCS resources are deployed on the same carrier.
However, since SCS of multiple resources deployed on the same carrier do not completely represent integer multiple relationship between each other, the center frequencies of resources of different SCS deployed on the same carrier may be different.
In the existing OFDM baseband signal generation process, it is not considered that the center frequencies of the resources of different SCS deployed on the same carrier are different, so that the generated OFDM baseband signal may have a phase offset, and further, the transmitting end device cannot modulate and up-convert the OFDM baseband signals of different SCS simultaneously transmitted on the same carrier to the target frequency position corresponding to the same frequency.
Disclosure of Invention
The embodiment of the invention provides a method and a device for generating an OFDM baseband signal, which are used for solving the problem of phase deviation of the existing OFDM baseband signal.
In order to solve the technical problem, the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a method for generating an OFDM baseband signal, where the method includes:
obtaining a difference value between the first frequency and the second frequency; the first frequency is a central frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to a first OFDM symbol in the M OFDM baseband signals;
determining a phase offset corresponding to the first OFDM baseband signal according to the difference value and the time domain information corresponding to the first OFDM symbol;
and generating the first OFDM baseband signal according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.
In a second aspect, an embodiment of the present invention provides an OFDM baseband signal generating apparatus, including:
the acquisition module is used for acquiring a difference value between the first frequency and the second frequency; the first frequency is a central frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to a first OFDM symbol in the M OFDM baseband signals;
a determining module, configured to determine a phase offset corresponding to the first OFDM baseband signal according to the difference obtained by the obtaining module and time domain information corresponding to the first OFDM symbol;
a generating module, configured to generate the first OFDM baseband signal according to the phase offset determined by the determining module and a data symbol of the resource element carried on the first OFDM symbol.
In a third aspect, an embodiment of the present invention provides an OFDM baseband signal generating apparatus, including a processor, a memory, and a computer program stored on the memory and operable on the processor, where the computer program, when executed by the processor, implements the steps of the method according to the first aspect.
In a fourth aspect, the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when executed by a processor, implements the steps of the method according to the first aspect.
In the embodiment of the present invention, in a process of generating an OFDM baseband signal, according to a frequency difference between a center frequency of a frequency bandwidth of a common resource block in a first resource set and a second frequency and time domain information of any OFDM symbol on M OFDM symbols mapped by the first resource set, the embodiment of the present invention determines a phase offset of the OFDM symbol, so as to perform phase compensation on a frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency, to ensure that boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, and avoid a phase deviation of the generated OFDM baseband signal, thereby improving efficiency of communication.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic diagram of a possible structure of a communication system according to an embodiment of the present invention;
fig. 2 is a first flowchart illustrating a method for generating an OFDM baseband signal according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an OFDM baseband signal generating apparatus according to an embodiment of the present invention;
fig. 4 is a second schematic structural diagram of an OFDM baseband signal generating apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Some of the terms referred to in this disclosure are explained below for the convenience of the reader:
1. synchronization Signal Block (SSB) (SSB may also be referred to as SS Block)
One SSB occupies 4 consecutive OFDM symbols in time, and occupies 20 × 12 subcarriers in frequency domain, which includes Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Signal (PBCH), PBCH-DMRS. In addition, the start of the first subcarrier of the SSB may not be the boundary of the first Common RB (Common resource block) transmitting the SSB, i.e., there may be a frequency separation between the first subcarrier of the SSB and the first subcarrier of the first Common RB transmitting the SSB.
2. The existing generation process of the OFDM baseband signal:
1) taking the OFDM baseband signal generation process of other signals except the Physical Random Access Channel (PRACH) as an example, the first OFDM time-domain baseband signal in one subframe
Figure BDA0001658526630000021
The generation formula of (c) is as follows:
Figure BDA0001658526630000031
wherein p is a port number of the signal, t is a sampling time, μ is configuration information of a Subcarrier Spacing (SCS), Δ f represents the SCS when the configuration information of the SCS is μ, k is a Subcarrier number,
Figure BDA0001658526630000032
for indicating the number of RBs within the bandwidth resource,
Figure BDA0001658526630000033
for indicating the number of sub-carriers within one RB,
Figure BDA0001658526630000034
used to indicate the cyclic prefix length of the l-th OFDM symbol when the configuration information of the SCS is μ. T in the above equation 1c＝1/(Δfmax·Nf) Wherein, Δ fmax＝480·103Hz，Nf4096. the value range of t is as follows:
Figure BDA0001658526630000035
for port p, corresponding to the l-th OFDM symbol when the SCS configures μ, the symbol on the k-th subcarrier.
In case that the configuration information of the SCS is μ, the starting time point for the l-th OFDM is as follows:
Figure BDA0001658526630000036
wherein, the SCS corresponding to each μ value is shown in table 1 below:
μ Δf＝2μ·15
0 15
1 30
2 60
3 120
4 240
…… ……
TABLE 1
Wherein, the above
Figure BDA0001658526630000037
As indicated by the higher layer signaling k0, the existing protocol states that, in the existing OFDM baseband signal generation process, it is necessary to ensure that the sub-carriers 0 in all Common RBs transmitted with different SCS on the same carrier are aligned, i.e. the boundaries of all Common RBs under the same carrier need to be aligned.
2) For PRACH, the first OFDM time domain baseband signal in one subframe OFDM time domain baseband signal
Figure BDA0001658526630000038
The generation formula of (c) is as follows:
Figure BDA0001658526630000039
K＝Δf/ΔfRA(equation 4);
Figure BDA00016585266300000310
wherein p is a port number of the signal, t is a sampling time, μ is configuration information of the SCS, Δ f represents the SCS when the configuration information of the SCS is μ, and Δ f indicates the SCS of an initially activated uplink partial bandwidth (initial active uplink bandwidth part) where the PRACH resource is located or an activated uplink partial bandwidth (active uplink bandwidth part) where the PRACH resource is located. k is the subcarrier number.
Figure BDA00016585266300000311
Number of subcarriers representing guard interval in Δ fRA。
Figure BDA00016585266300000312
Used to indicate the cyclic prefix length of the l-th OFDM symbol when the configuration information of the SCS is μ.
T in the above equation 3c＝1/(Δfmax·Nf) Wherein, Δ fmax＝480·103Hz，Nf＝4096。
Figure BDA00016585266300000313
Is on port p, and is used for sending symbols on the kth subcarrier of the PRACH preamble.
Figure BDA00016585266300000314
For indicating the number of RBs within the bandwidth resource when the configuration information is μ,
Figure BDA00016585266300000315
indicating the number of subcarriers within one RB.
ΔfRAIndicating SCS for PRACH on the frequency domain.
Figure BDA0001658526630000041
Indicating the lowest numbered Common RB on the initially activated uplink partial bandwidth obtained by the higher layer signaling initial-UL-BWP in the initial access phase; if not, then,
Figure BDA0001658526630000042
indicating the lowest numbered Common RB on the activated uplink fractional bandwidth obtained by the higher layer signaling UL-BWP.
Figure BDA0001658526630000043
Indicating a Frequency offset between a PRACH transmission opportunity (PRACH transmission occasion) on a Frequency domain indicated by a higher layer signaling (msg1-Frequency Start) related to an initially activated uplink portion bandwidth at an initial access phase and a PRB0 on the initially activated uplink portion bandwidth; if not, then,
Figure BDA0001658526630000044
indicating the Frequency offset between the lowest Frequency PRACH transmission occasion in the Frequency domain indicated by the higher layer signaling (msg1-Frequency Start) associated with activating the uplink portion bandwidth and the PRB0 on the activating uplink portion bandwidth.
nRADenotes the number of PRACH transmission occasion in the frequency domain at a certain point in time (time instance, which refers to the time domain length of one PRACH transmission opportunity).
Figure BDA0001658526630000045
Indicating the number of RBs occupied by the frequency domain of the random access signal based on PUSCH SCS.
For FR1,. DELTA.fRAE {1.25,5,15,30} kHz, at which time
Figure BDA0001658526630000046
Indicating PRACH preThe starting position of the amble in one subframe. For FR2,. DELTA.fRAE {60,120} kHz, at this time
Figure BDA0001658526630000047
Indicating the starting position of the PRACH preamble in a slot with SCS of 60 kHz.
LRAAnd NuRespectively indicate the ZC sequence length of the Preamble and the time length after mapping.
Figure BDA0001658526630000048
Denotes the CP length, where:
when Δ fRAWhen the epsilon is larger than {1.25,5} kHz, n is 0;
when Δ fRAE {15,30,60,120} kHz, n represents
Figure BDA0001658526630000049
The number of start symbols of a field of 0.5ms contained within the interval.
Wherein, the above
Figure BDA00016585266300000410
As indicated by the higher layer signaling k0, the existing protocol states that, in the existing OFDM baseband signal generation process, it needs to be guaranteed that the sub-carriers 0 in all Common RBs deployed with different SCS on the same carrier are aligned, i.e. the boundaries of all Common RBs under the same carrier need to be aligned.
3. Related terms
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship; in the formula, the character "/" indicates that the preceding and following related objects are in a relationship of "division". The term "plurality" herein means two or more, unless otherwise specified.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used to distinguish the same items or similar items with basically the same functions or actions, and those skilled in the art can understand that the words "first", "second", and the like do not limit the quantity and execution order.
In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion. In the embodiments of the present invention, the meaning of "a plurality" means two or more unless otherwise specified.
The technical scheme provided by the application is described below with reference to the accompanying drawings.
The technical scheme provided by the invention can be applied to various communication systems, such as a 5G communication system, a future evolution system or a plurality of communication convergence systems and the like. A variety of application scenarios may be included, for example, scenarios such as Machine to Machine (M2M), D2M, macro and micro Communication, enhanced Mobile Broadband (eMBB), ultra high reliability and ultra Low Latency Communication (urrllc), and mass internet of things Communication (mtc). These scenarios include, but are not limited to: the communication between the terminals, the communication between the network devices, or the communication between the network devices and the terminals. The embodiment of the invention can be applied to the communication between the network equipment and the terminal in the 5G communication system, or the communication between the terminal and the terminal, or the communication between the network equipment and the network equipment.
Fig. 1 shows a schematic diagram of a possible structure of a communication system according to an embodiment of the present invention. As shown in fig. 1, the communication system includes a transmitting-end device 100 and a receiving-end device 200.
For example, after generating the OFDM baseband signal, the sending-end device 100 in the embodiment of the present invention may up-convert the OFDM baseband signal to a carrier frequency, and send the OFDM baseband signal to the receiving-end device 200.
In this embodiment of the present invention, the sending-end device 100 may be a network device or a terminal device, and the present invention is not limited thereto. For example, for the downlink, the sending end device 100 is a network device, and the receiving end device 200 is a terminal device, and for the uplink, the sending end device 100 is a terminal device, and the receiving end device 200 is a network device.
The network device 100 may be a base station, a core network device, a Transmission and Reception node (TRP), a relay station, an access Point, or the like. The network device 100 may be a Base Transceiver Station (BTS) in a Global System for Mobile communication (GSM) or Code Division Multiple Access (CDMA) network, or may be an nb (nodeb) in Wideband Code Division Multiple Access (WCDMA), or may be an eNB or enodeb (evolved nodeb) in LTE. The Network device 100 may also be a wireless controller in a Cloud Radio Access Network (CRAN) scenario. The network device 100 may also be a network device in a 5G communication system or a network device in a future evolution network. The words used are not to be construed as limitations of the invention.
The terminal 200 may be a wireless terminal, which may be a device providing voice and/or other traffic data connectivity to a user, a handheld device having wireless communication functionality, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved PLMN network, etc., as well as a wired terminal. A Wireless terminal may communicate with one or more core networks via a Radio Access Network (RAN), and may be a mobile terminal, such as a mobile telephone (or "cellular" telephone) and a computer with a mobile terminal, for example, a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device that exchanges voice and/or data with the RAN, a Personal Communication Service (PCS) telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), and the like, or a mobile device, a User Equipment (User Equipment, UE), a UE terminal, an Access terminal, a Wireless Communication device, a terminal unit, a terminal station, a Radio Access Network (wlan), a terminal station, a mobile terminal, a mobile Communication device, a terminal unit, a terminal station, and a mobile terminal, A Mobile Station (Mobile Station), a Mobile Station (Mobile), a Remote Station (Remote Station), a Remote Station, a Remote Terminal (Remote Terminal), a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a User Agent (User Agent), a Terminal device, and the like. As an example, in the embodiment of the present invention, fig. 1 illustrates that the terminal is a mobile phone.
The execution main body of the OFDM baseband signal generation method provided in the embodiment of the present invention may be an OFDM baseband signal generation apparatus, and the OFDM baseband signal generation apparatus may be a sending end device, and may also be a functional module and/or a functional entity that can implement the OFDM baseband signal generation method in the sending end device, which may be determined specifically according to actual use requirements, and the embodiment of the present invention is not limited. The following takes the sending end device as an example to exemplarily describe the OFDM baseband signal generation method provided in the embodiment of the present invention.
Fig. 2 is a schematic flowchart illustrating a method for generating an OFDM baseband signal according to an embodiment of the present invention, where as shown in fig. 2, the method for generating an OFDM baseband signal may include:
s201, the sending end device obtains a difference value between the first frequency and the second frequency.
The sending end device in the embodiment of the present invention may be a sending end device in the communication system shown in fig. 1, for example, a base station.
In this embodiment of the present invention, the first frequency is a center frequency of a frequency bandwidth of a common resource block in the first resource set, that is, the first frequency may be a center frequency of a frequency bandwidth of all or a part of the common resource blocks in the first resource set, for example, if the first resource set includes N common resource blocks, the first frequency is a center frequency of a frequency bandwidth occupied by the N common resource blocks in the first resource set. The first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol in the M OFDM baseband signals.
In the embodiment of the present invention, the second frequency plays a role of a reference frequency in the embodiment of the present invention, so as to ensure that boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, and therefore, the specific frequency value of the second frequency in the embodiment of the present invention is not limited in the present invention, and may be any value.
Optionally, in this embodiment of the present invention, the second frequency may be a frequency modulated and upconverted by an OFDM baseband signal, that is, after the M OFDM baseband signals are generated, the sending end device modulates and upconverts the M OFDM baseband signals generated to the second frequency for sending. After the OFDM baseband signal is modulated and up-converted, the OFDM baseband signal is modulated to a second higher frequency that is greater than the frequency of the OFDM baseband signal.
Optionally, in this embodiment of the present invention, when the first resource set is a resource set transmitted on the first carrier, in this case, the second frequency may be one of frequencies within a frequency bandwidth of the first carrier, for example, the second frequency may be a center frequency of the first carrier, or may be a center frequency of a resource configured at an arbitrary subcarrier interval in the first carrier, or may be any other frequency within the frequency bandwidth of the first carrier, or may be one of a specific frequency set of the first carrier, which is not limited in this invention.
It should be noted that the resource set in the embodiment of the present invention may be a resource grid (resource grid) specified in the standard, or may be a resource set composed of common resource blocks for transmitting SSBs.
Optionally, in this embodiment of the present invention, before S201, the method further includes the following step of acquiring the first frequency:
s201a1, where the sending end device obtains parameter information of a first resource set carried by a high-level signaling from the high-level signaling sent by the network device.
The parameter information of the first resource set includes but is not limited to: the boundary of the first common resource block of the first resource set corresponds to the frequency, the number of the common resource blocks of the first resource set, the subcarrier interval corresponding to the first resource set and the frequency f of the frequency reference pointpointA。
S201a2, the sending-end device calculates a center frequency of a frequency bandwidth of the first resource set according to the parameter information.
Illustratively, the sending end device corresponds to the frequency according to the boundary of the first common resource block of the first resource set, the number of the common resource blocks of the first resource set, and the subcarrier spacing and f corresponding to the first resource setpointAThe frequency bandwidth of the first set of resources is calculated, and then the center frequency of the frequency bandwidth is determined.
Optionally, in this embodiment of the present invention, the common resource block in the first resource set is a common resource block for transmitting an SSB. Illustratively, before S201, the method further includes the step of acquiring the first frequency as follows:
s201b, the sending end device obtains the first frequency carried by the high-level signaling from the high-level signaling indicated by the network device.
Illustratively, for a non-cell defining SSB (i.e., an SSB that does not carry search information of a scheduling system information PDCCH), an absolute frequency point position is carried in a higher layer signaling indicated by the network device, where the frequency point position is a central frequency point of a first resource set for transmitting the SSB.
Optionally, in this embodiment of the present invention, the common resource block in the first resource set is a common resource block for transmitting an SSB. Illustratively, before S201, the method further includes the step of acquiring the first frequency as follows:
s201c1, the sending end device obtains the SSB parameter information carried by the high-level signaling from the high-level signaling indicated by the network device.
S201c2, the sending-end device calculates a first frequency according to the parameter information and the frequency calculation formula.
Wherein, the parameter information includes: frequency f of the frequency reference pointpointANumber of subcarriers in each RB
Figure BDA0001658526630000061
Figure BDA0001658526630000071
The boundary of the first common resource block of the transmission SSB and the frequency reference point are separated by a first frequency interval delta funit,1Number of common resource blocks N in unitsoffsetSecond frequency interval Δ funit,2SSB subcarrier spacing Δ fSSBAnd the number of common resource blocks transmitting SSBs
Figure BDA0001658526630000072
Δ f described aboveunit,2Is the frequency separation between the first subcarrier of the SSB and the boundary of the first common resource block on which the SSB is transmitted.
The frequency calculation formula is as follows:
Figure BDA0001658526630000073
for example, for a cell defining SSB (i.e., an SSB that can be searched by a terminal in a cell search and carries search information of a scheduling system information PDCCH), a higher layer signaling indicated by a network device carries parameter information of the SSB, and based on the parameter information, a center frequency point of a first resource set for transmitting the SSB can be determined.
S202, the sending end device determines a phase offset corresponding to the first OFDM baseband signal according to the difference and the time domain information corresponding to the first OFDM symbol.
In an embodiment of the present invention, the time domain information corresponding to the first OFDM symbol includes
Figure BDA0001658526630000074
TC、
Figure BDA0001658526630000075
In one possible example, the phase offset described above is for OFDM baseband signal generation other than PRACH
Figure BDA0001658526630000076
Figure BDA0001658526630000077
For compensating the first frequency f1 μAnd a second frequency f2The frequency difference therebetween.
Example 1: if the first frequency f1 μThe center frequency of the resource for transmitting the OFDM baseband signal of 15kHz (namely mu is 0), and the second frequency f2Is the center frequency of the first carrier wave, then
Figure BDA00016585266300000713
In particular to compensate for the frequency difference between the centre frequency of the resource grid and the centre frequency of the first carrier at 15kHz subcarrier spacing.
Example 2: if the first frequency f1 μTo transmit the center frequency (i.e., μ ═ 1) of the resource of the SSB OFDM baseband signal of 30kHz, the second frequency f2Is the center frequency of the first carrier wave, then
Figure BDA0001658526630000078
In particular to compensate for the frequency difference between the centre frequency of the resource at 30kHz subcarrier spacing and the centre frequency of the first carrier.
In another possible example, the phase offset described above for the OFDM baseband signal generation for PRACH
Figure BDA0001658526630000079
Figure BDA00016585266300000710
For compensating the first frequency f1 μAnd a second frequency f2The frequency difference therebetween.
Example 3: if the first frequency f1 μThe second frequency f is the center frequency (i.e., mu is 0) of the resource at the 15kHz subcarrier interval of the OFDM baseband signal for transmitting the PRACH2Is the center frequency of the first carrier wave, then
Figure BDA00016585266300000711
In particular to compensate for the frequency difference between the centre frequency of the resource grid and the centre frequency of the first carrier at 15kHz subcarrier spacing.
S203, the sending end device generates a first OFDM baseband signal according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.
Illustratively, in the embodiment of the present invention, when the sending-end device generates the first OFDM baseband signal, the sending-end device may be implemented by the following two implementation manners:
a first possible implementation:
in this implementation, the sending end device may directly perform phase compensation in the generation process of the OFDM baseband signal.
Optionally, in the embodiment of the present invention, S203 may specifically be implemented by the following steps:
s203a, the sending-end device generates the first OFDM baseband signal according to the phase offset, the data symbol of the resource element carried on the first OFDM symbol, and the OFDM baseband signal generating formula.
Illustratively, in the embodiment of the present invention, the OFDM baseband signal generating formula at least includes the following two forms:
form 1 (for OFDM baseband signal generation other than PRACH):
the OFDM baseband signal generation formula described above can be represented as the following formula 7:
Figure BDA00016585266300000712
wherein the content of the first and second substances,
Figure BDA0001658526630000081
form 2 (generation of OFDM baseband signal for PRACH):
the OFDM baseband signal generation formula described above can be represented as the following formula 8:
Figure BDA0001658526630000082
wherein, K ═ Δ f/Δ fRA(i.e., equation 4 above);
Figure BDA0001658526630000083
Figure BDA0001658526630000084
a second possible implementation:
in this implementation, the sending-end device may perform phase compensation on the transmitted data symbols before generating the OFDM baseband signal, and then generate the OFDM baseband signal according to the phase-compensated data symbols.
Optionally, in the embodiment of the present invention, S203 may specifically be implemented by the following steps:
s203b1, the sending end device performs phase compensation on the data symbol of the resource element carried on the first OFDM symbol according to the phase offset.
S203b2, the sending end device generates a first OFDM baseband signal according to the phase-compensated data symbol of the resource element carried on the first OFDM symbol.
Illustratively, if the data symbol of the resource element carried on the first OFDM symbol is used
Figure BDA0001658526630000085
That is, the transmitting end device may generate the OFDM baseband signal before the OFDM baseband signal is generated
Figure BDA0001658526630000086
And
Figure BDA0001658526630000087
the data symbols of the resource elements carried on the first OFDM symbol are phase compensated by multiplication, and then an OFDM baseband signal is generated by the following formula.
The above OFDM baseband signal generation formula can be shown as the following formula 9, for OFDM baseband signal generation other than PRACH:
Figure BDA0001658526630000088
the above OFDM baseband signal generation formula may be represented by the following formula 10, and the OFDM baseband signal for PRACH is generated:
Figure BDA0001658526630000089
wherein, K ═ Δ f/Δ fRA(i.e., equation 4 above);
Figure BDA00016585266300000810
in the OFDM baseband signal generating method provided in the embodiment of the present invention, in a process of generating an OFDM baseband signal, according to a frequency difference between a center frequency of a frequency bandwidth of a common resource block in a first resource set and a second frequency and time domain information of any OFDM symbol on M OFDM symbols mapped by the first resource set, a phase offset of the OFDM symbol is determined in the embodiment of the present invention, so that a frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency is subjected to phase compensation, a boundary alignment of common resource blocks transmitted at different subcarrier intervals is ensured, a phase deviation of the generated OFDM baseband signal can be avoided, and thus, a communication efficiency can be improved.
In addition, in the prior artIn the technology, the network equipment introduces the formula of OFDM baseband signal
Figure BDA00016585266300000811
The position relation of the boundaries of Common RBs transmitted by different SCS on the same carrier is embodied, so that the generated OFDM baseband signal can be ensured to be transmitted at the correct frequency position, and the sub-carriers 0 in all Common RBs transmitted by different SCS on the same carrier are aligned. However, the above
Figure BDA0001658526630000091
A higher layer signaling indication is required to the terminal side, thereby introducing additional signaling overhead.
Therefore, the OFDM baseband signal generation formula applied by the OFDM baseband signal generation method provided in the embodiment of the present invention does not include
Figure BDA0001658526630000092
So that the whole procedure does not require high layer signalling indication
Figure BDA0001658526630000093
Additional signaling overhead is saved.
As shown in fig. 3, an embodiment of the present invention provides an OFDM baseband signal generating apparatus 300, where the apparatus includes: an obtaining module 301, a determining module 302, and a generating module 303, wherein:
an obtaining module 301, configured to obtain a difference between a first frequency and a second frequency; the first frequency is a center frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol in the M OFDM baseband signals.
A determining module 302, configured to determine a phase offset corresponding to the first OFDM baseband signal according to the difference obtained by the obtaining module 301 and the time domain information corresponding to the first OFDM symbol.
A generating module 303, configured to generate a first OFDM baseband signal according to the phase offset determined by the determining module 302 and the data symbol of the resource element carried on the first OFDM symbol.
Optionally, as shown in fig. 3, the apparatus 300 further includes: a sending module 304, wherein:
a transmitting module 304, configured to modulate and up-convert the M OFDM baseband signals generated by the generating module 303 to a second frequency for transmission.
Optionally, the generating module 303 is specifically configured to: according to the phase offset determined by the determining module 302, performing phase compensation on the data symbol of the resource particle carried on the first OFDM symbol; and generating a first OFDM baseband signal according to the data symbol which is carried on the first OFDM symbol and is subjected to phase compensation.
Optionally, the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; the obtaining module 301 is further configured to obtain a first frequency carried by a high-level signaling from the high-level signaling indicated by the network device.
Optionally, the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; the obtaining module 301 is further configured to obtain, from the high-level signaling indicated by the network device, parameter information of the SSB carried in the high-level signaling, and calculate the first frequency according to the parameter information and a frequency calculation formula.
Wherein the parameter information includes: frequency f of the frequency reference pointpointANumber of subcarriers in each RB
Figure BDA0001658526630000094
The boundary of the first common resource block of the transmission SSB and the frequency reference point are separated by a first frequency interval delta funit,1Number of common resource blocks N in unitsoffsetSecond frequency interval Δ funit,2SSB subcarrier spacing Δ fSSBAnd the number of common resource blocks transmitting SSBs
Figure BDA0001658526630000095
Δfunit,2Is the first of SSBFrequency separation between the subcarrier and the boundary of the first common resource block transmitting the SSB; the frequency calculation formula is:
Figure BDA0001658526630000096
in the OFDM baseband signal generating apparatus provided in the embodiment of the present invention, in a process of generating an OFDM baseband signal, according to a frequency difference between a center frequency of a frequency bandwidth of a common resource block in a first resource set and a second frequency and time domain information of any OFDM symbol on M OFDM symbols mapped by the first resource set, a phase offset of the OFDM symbol is determined, so that phase compensation is performed on a frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency, alignment of boundaries of common resource blocks transmitted at different subcarrier intervals is ensured, a phase deviation of the generated OFDM baseband signal can be avoided, and thus, efficiency of communication can be improved.
The OFDM baseband signal generating apparatus provided in the embodiment of the present invention can implement the process shown in fig. 2 in the foregoing method embodiment, and is not described here again to avoid repetition.
Fig. 4 is a schematic diagram of a hardware structure of an OFDM baseband signal generating apparatus for implementing an embodiment of the present invention, where the apparatus 400 includes: a processor 401, a transceiver 402, a memory 403, a user interface 404 and a bus interface.
The processor 401 is configured to obtain a difference between a first frequency and a second frequency; the first frequency is a central frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol in the M OFDM baseband signals; determining a phase offset corresponding to the first OFDM baseband signal according to the difference value and time domain information corresponding to the first OFDM symbol; and generating a first OFDM baseband signal according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.
In the OFDM baseband signal generating apparatus provided in the embodiment of the present invention, in a process of generating an OFDM baseband signal, according to a frequency difference between a center frequency of a frequency bandwidth of a common resource block in a first resource set and a second frequency and time domain information of any OFDM symbol on M OFDM symbols mapped by the first resource set, a phase offset of the OFDM symbol is determined, so that phase compensation is performed on a frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency, alignment of boundaries of common resource blocks transmitted at different subcarrier intervals is ensured, a phase deviation of the generated OFDM baseband signal can be avoided, and thus, efficiency of communication can be improved.
In the embodiment of the present invention, in fig. 4, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 401 and various circuits of memory represented by memory 403 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 402 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium. The processor 401 is responsible for managing the bus architecture and general processing, and the memory 403 may store data used by the processor 401 in performing operations.
In addition, the OFDM baseband signal generating apparatus 400 further includes some functional blocks that are not shown, and are not described herein again.
Optionally, an embodiment of the present invention further provides a sending end device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, where the computer program, when executed by the processor, implements the process of the OFDM baseband signal generation method in the first embodiment, and can achieve the same technical effects, and details are not repeated here to avoid repetition.
An embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements multiple processes of the OFDM baseband signal generation method in the foregoing embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solution 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 (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (14)

1. A method for generating an OFDM baseband signal, the method comprising:
obtaining a difference value between the first frequency and the second frequency; the first frequency is a central frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol in the M OFDM baseband signals;
determining a phase offset corresponding to the first OFDM baseband signal according to the difference value and the time domain information corresponding to the first OFDM symbol;
and generating the first OFDM baseband signal according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.
2. The method of claim 1, wherein after generating the first OFDM baseband signal according to the phase offset and the data symbols of the resource elements carried on the first OFDM symbol, the method further comprises:
modulating and up-converting the generated M OFDM baseband signals to the second frequency for transmission.
3. The method of claim 1, wherein generating the first OFDM baseband signal according to the phase offset and data symbols of resource elements carried on the first OFDM symbol comprises:
according to the phase offset, carrying out phase compensation on the data symbols of the resource particles carried on the first OFDM symbol;
and generating the first OFDM baseband signal according to the data symbol which is carried on the first OFDM symbol and is subjected to phase compensation.
4. The method according to any of claims 1 to 3, wherein the common resource blocks in the first set of resources are common resource blocks of a Transmission synchronization Signal Block, SSB;
before obtaining the difference between the first frequency and the second frequency, the method further includes:
and acquiring the first frequency carried by the high-level signaling from the high-level signaling indicated by the network equipment.
5. The method according to any of claims 1 to 3, wherein the common resource blocks in the first set of resources are common resource blocks of a Transmission synchronization Signal Block, SSB;
before obtaining the difference between the first frequency and the second frequency, the method further includes:
acquiring parameter information of the SSB carried by a high-level signaling from the high-level signaling indicated by network equipment;
calculating the first frequency according to the parameter information and a frequency calculation formula;
wherein the parameter information includes: frequency f of the frequency reference pointpointANumber of subcarriers in each RB
Figure FDA0001658526620000011
A boundary of a first common resource block transmitting the SSB and the frequency reference point are separated by a first frequency interval delta funit,1Number of common resource blocks N in unitsoffsetSecond frequency interval Δ funit,2Subcarrier spacing Δ f of the SSBSSBAnd the number of common resource blocks transmitting the SSB
Figure FDA0001658526620000012
The Δ funit,2Is the frequency interval between the first subcarrier of the SSB and the boundary of the first common resource block transmitting the SSB;
the frequency calculation formula is as follows:
Figure FDA0001658526620000013
6. the method of claim 1, wherein the first set of resources is a set of resources transmitted on a first carrier; the second frequency is one of the frequencies within a frequency bandwidth of the first carrier.
7. An Orthogonal Frequency Division Multiplexing (OFDM) baseband signal generation device, comprising:
the acquisition module is used for acquiring a difference value between the first frequency and the second frequency; the first frequency is a central frequency of a frequency bandwidth of a common resource block in a first resource set, the first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol in the M OFDM baseband signals;
a determining module, configured to determine a phase offset corresponding to the first OFDM baseband signal according to the difference obtained by the obtaining module and time domain information corresponding to the first OFDM symbol;
a generating module, configured to generate the first OFDM baseband signal according to the phase offset determined by the determining module and a data symbol of the resource element carried on the first OFDM symbol.
8. The apparatus of claim 7, further comprising:
a transmitting module, configured to modulate and up-convert the M OFDM baseband signals generated by the generating module to the second frequency for transmission.
9. The apparatus of claim 7, wherein the generating module is specifically configured to:
according to the phase offset, carrying out phase compensation on the data symbols of the resource particles carried on the first OFDM symbol;
and generating the first OFDM baseband signal according to the data symbol which is carried on the first OFDM symbol and is subjected to phase compensation.
10. The apparatus according to any of claims 7 to 9, wherein the common resource blocks in the first set of resources are common resource blocks of a transmission synchronization signal block, SSB;
the obtaining module is further configured to obtain the first frequency carried by the high-level signaling from the high-level signaling indicated by the network device.
11. The apparatus according to any of claims 7 to 9, wherein the common resource blocks in the first set of resources are common resource blocks of a transmission synchronization signal block, SSB;
the acquiring module is further configured to acquire, from a high-level signaling indicated by a network device, parameter information of the SSB carried by the high-level signaling, and calculate the first frequency according to the parameter information and a frequency calculation formula;
wherein the parameter information includes: frequency f of the frequency reference pointpointANumber of subcarriers in each RB
Figure FDA0001658526620000021
A boundary of a first common resource block transmitting the SSB and the frequency reference point are separated by a first frequency interval delta funit,1Number of common resource blocks N in unitsoffsetSecond frequency interval Δ funit,2Subcarrier spacing Δ f of the SSBSSBAnd the number of common resource blocks transmitting the SSB
Figure FDA0001658526620000022
The Δ funit,2Is the frequency interval between the first subcarrier of the SSB and the boundary of the first common resource block transmitting the SSB;
the frequency calculation formula is as follows:
Figure FDA0001658526620000023
12. the apparatus of claim 7, wherein the first set of resources is a set of resources transmitted on a first carrier; the second frequency is one of the frequencies within a frequency bandwidth of the first carrier.
13. An OFDM baseband signal generation apparatus comprising a processor, a memory, and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the OFDM baseband signal generation method according to any one of claims 1 to 6.
14. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, realizes the steps of the OFDM baseband signal generation method according to any one of claims 1 to 6.
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