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

Abstract

Embodiments of the present invention provide a method and an apparatus for generating an OFDM baseband signal, which relate to the field of communications and are used to solve the problem of phase deviation existing in an existing OFDM baseband signal. The method includes: acquiring a difference between a first frequency and a second frequency; wherein the first frequency is a center frequency of a frequency bandwidth of a common resource block in a first resource set, and 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 an OFDM baseband signal corresponding to the first OFDM symbol among the M OFDM baseband signals; according to the difference value and time domain information corresponding to the first OFDM symbol, the first OFDM symbol is determined. The phase offset corresponding to the OFDM baseband signal; the first OFDM baseband signal is generated according to the phase offset and the data symbol of the resource element carried on the first OFDM symbol.

Description

A method and device for generating an OFDM baseband signal

technical field

The present invention relates to the field of communication technologies, and in particular, to a method and device for generating an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) baseband signal.

Background technique

Currently, in the 5G NR system, the subcarrier spacing SCS (subcarrier spacing) of the common resource block (Common RB) carried on the carrier can be set to 15*(2^n) kHz, where n can be a negative number. That is to say, in the NR system, the SCS can be set to: 3.75kHz, 7.5kHz, 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, etc. At the same time, the existing 5GNR system supports the simultaneous transmission of OFDM baseband signals of different SCSs in the same carrier, that is, resources of different SCSs will be deployed on the same carrier.

However, since the SCSs of multiple resources deployed on the same carrier do not completely exhibit an integer multiple relationship, the center frequencies of resources of different SCSs deployed on the same carrier are likely to be different.

Since the existing OFDM baseband signal generation process does not take into account the different center frequencies of the resources of different SCS deployed on the same carrier, the generated OFDM baseband signal may have a phase offset, which makes it impossible for the transmitting end device to convert the same carrier The OFDM baseband signals of different SCSs sent simultaneously are modulated and up-converted to the target frequency position corresponding to the same frequency.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a method and device for generating an OFDM baseband signal, so as to solve the problem of phase deviation existing in the existing OFDM baseband signal.

In order to solve the above-mentioned technical problems, the present invention is achieved in this way:

In a first aspect, an embodiment of the present invention provides a method for generating an OFDM baseband signal, the method comprising:

obtaining the difference between the first frequency and the second frequency; wherein the first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and 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 among the M OFDM baseband signals;

determining a phase offset corresponding to the first OFDM baseband signal according to the difference and time domain information corresponding to the first OFDM symbol;

The first OFDM baseband signal is generated according to the phase offset and the data symbols of the resource elements carried on the first OFDM symbol.

In a second aspect, an embodiment of the present invention provides an apparatus for generating an OFDM baseband signal, including:

An acquisition module, configured to acquire the difference between the first frequency and the second frequency; wherein the first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and the first resource set is mapped on M On the number of OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is an OFDM baseband signal corresponding to the first OFDM symbol among 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 value obtained by the obtaining module and the 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 the data symbols of the resource elements carried on the first OFDM symbol.

In a third aspect, an embodiment of the present invention provides an apparatus for generating an OFDM baseband signal, including a processor, a memory, and a computer program stored in the memory and executable on the processor, when the computer program is executed by the processor The steps of implementing the method as described in the first aspect.

In a fourth aspect, an embodiment of the present invention 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 steps of the method according to the first aspect are implemented.

In the embodiment of the present invention, in the process of generating the OFDM baseband signal, the embodiment of the present invention uses the frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency and the The time domain information of any OFDM symbol on the mapped M OFDM symbols determines the phase offset of the OFDM symbol, so as to determine the difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency. Phase compensation is performed on the frequency difference to ensure that the boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, which can avoid phase deviations in the generated OFDM baseband signals, thereby improving communication efficiency.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the drawings that are used in the description of the embodiments of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention. , for those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

FIG. 1 is a schematic diagram of a possible structure of a communication system involved in an embodiment of the present invention;

FIG. 2 is a schematic flowchart 1 of 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 apparatus for generating an OFDM baseband signal according to an embodiment of the present invention;

FIG. 4 is a second schematic structural diagram of an apparatus for generating an OFDM baseband signal according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Part of the terms involved in the present invention are explained below to facilitate the reader's understanding:

1. Synchronisation signal & PBCH Block (SSB) (SSB can also be called: SSblock)

An SSB occupies 4 consecutive OFDM symbols in time and 20*12 consecutive subcarriers in the frequency domain, including the Primary Syncronization Signal (PSS), the Secondary Syncronization Signal (SSS) and the physical broadcast. Signal (Physical Broadcast Channel, PBCH), PBCH-DMRS. In addition, the starting point of the first subcarrier of the SSB may not be the boundary of the first Common RB (common resource block) for transmitting the SSB, that is, the first subcarrier of the SSB may be different from the first Common RB for transmitting the SSB. There is a frequency gap between the first subcarriers.

2. The generation process of the existing OFDM baseband signal:

的生成公式如下：1), taking the OFDM baseband signal generation process of other signals except physical random access channel (Physical Random Access Channel, PRACH) as an example, the first OFDM time domain baseband signal in a subframe

The generation formula is as follows:

用于表示带宽资源内的RB个数，

用于表示一个RB内的子载波个数，

用于表示在SCS的配置信息为μ时，第l个OFDM符号的循环前缀长度。上述公式1中的T_c＝1/(Δf_max·N_f)，其中，Δf_max＝480·10³Hz，N_f＝4096。t的取值范围为：

为端口p上，对应于SCS配置μ时第l个OFDM符号，第k个子载波上的符号。Among them, p is the port number of the signal, t is the sampling time, μ is the configuration information of Subcarrier Spacing (SCS), Δf indicates the SCS when the configuration information of SCS is μ, and k is the subcarrier number,

is used to represent the number of RBs in the bandwidth resource,

is used to represent the number of subcarriers in an RB,

It is used to indicate the cyclic prefix length of the lth OFDM symbol when the configuration information of the SCS is μ. T _c =1/(Δf _max ·N _f ) in the above formula 1, where Δf _max =480·10 ³ Hz and N _f =4096. The value range of t is:

On port p, it corresponds to the l-th OFDM symbol and the symbol on the k-th subcarrier when the SCS is configured with μ.

When the configuration information of SCS is μ, the starting time point for the lth OFDM is as follows:

Among them, the SCS corresponding to each μ value is shown in Table 1 below:

μ Δf=2^μ·15 0 15 1 30 2 60 3 120 4 240 ... ...

Table 1

由高层信令k0来指示，现有的协议中规定，在现有的OFDM基带信号生成过程中，需要保证在同一载波上以不同SCS所传输的所有Common RB中的子载波0对齐，即同一载波下的所有Common RB的边界需要对齐。Among them, the above

Indicated by the high-level signaling k0, the existing protocol stipulates that in the existing OFDM baseband signal generation process, it is necessary to ensure that the subcarriers 0 in all Common RBs transmitted by different SCSs on the same carrier are aligned, that is, the same The boundaries of all Common RBs under the carrier need to be aligned.

的生成公式如下：2), for PRACH, the first OFDM time-domain baseband signal in a subframe is the OFDM time-domain baseband signal

The generation formula is as follows:

K=Δf/Δf _RA (Equation 4);

Among them, p is the port number of the signal, t is the sampling time, μ is the SCS configuration information, Δf indicates the SCS when the SCS configuration information is μ, and Δf indicates the initial active uplink bandwidth part where the PRACH resource is located. ) or the SCS of the active uplink bandwidth part where the PRACH resource is located. k is the subcarrier number.

表示保护间隔的子载波数目，单位为Δf_RA。

Indicates the number of subcarriers in the guard interval, in units of Δf _RA .

用于表示在SCS的配置信息为μ时，第l个OFDM符号的循环前缀长度。

It is used to indicate the cyclic prefix length of the lth OFDM symbol when the configuration information of the SCS is μ.

T _c =1/(Δf _max ·N _f ) in the above formula 3, where Δf _max =480·10 ³ Hz and N _f =4096.

为端口p上，用于发送PRACH preamble的第k个子载波上的符号。

用于表示配置信息为μ时带宽资源内的RB个数，

用于表示一个RB内的子载波个数。

is the symbol on the k-th subcarrier on port p used to transmit the PRACH preamble.

is used to indicate the number of RBs in the bandwidth resource when the configuration information is μ,

It is used to indicate the number of subcarriers in one RB.

Δf _RA represents the SCS of PRACH in the frequency domain.

表示初始接入阶段由高层信令initial-UL-BWP获得的初始激活的上行部分带宽上的最低编号的Common RB；否则，

表示由高层信令UL-BWP获得的激活的上行部分带宽上最低编号的Common RB。

Indicates the lowest numbered Common RB on the initially activated uplink part bandwidth obtained by the upper layer signaling initial-UL-BWP during the initial access phase; otherwise,

Indicates the lowest numbered Common RB on the activated uplink part bandwidth obtained by the upper layer signaling UL-BWP.

表示初始接入阶段由和初始激活上行部分带宽相关的高层信令(msg1-Frequency Start)指示的频域上的PRACH传输机会(PRACH transmission occasion)和初始激活上行部分带宽上的PRB0之间的频率偏移；否则，

表示和激活上行部分带宽相关的高层信令(msg1-Frequency Start)指示的频域上频率最低的PRACH transmissionoccasion和激活上行部分带宽上的PRB0之间的频率偏移。

Indicates the frequency between the PRACH transmission occasion (PRACH transmission occasion) in the frequency domain indicated by the upper-layer signaling (msg1-Frequency Start) related to the initial activation of the uplink part of the bandwidth during the initial access phase and the PRB0 on the initial activation of the uplink part of the bandwidth offset; otherwise,

Indicates the frequency offset between the PRACH transmissionoccasion with the lowest frequency in the frequency domain indicated by the higher-layer signaling (msg1-Frequency Start) related to the activated uplink part bandwidth and the PRB0 in the activated uplink part bandwidth.

n _RA represents the number of the PRACH transmission occasion in the frequency domain at a certain time instance (time instance, which refers to the time domain length of a PRACH transmission opportunity).

表示随机接入信号频域占用的，基于PUSCH SCS的RB的数目。

Indicates the number of RBs based on the PUSCH SCS occupied by the random access signal in the frequency domain.

表示PRACH preamble在一个子帧中的起始位置。对于FR2，Δf_RA∈{60,120}kHz，此时

表示PRACH preamble在一个SCS为60kHz的时隙中的起始位置。For FR1, Δf _RA ∈ {1.25, 5, 15, 30} kHz, when

Indicates the starting position of the PRACH preamble in a subframe. For FR2, Δf _RA ∈ {60,120}kHz, when

Indicates the starting position of the PRACH preamble in a time slot with an SCS of 60 kHz.

L _RA and _Nu represent the ZC sequence length of Preamble and the time length after mapping, respectively.

表示CP长度，其中：

represents the CP length, where:

When Δf _RA ∈ {1.25,5}kHz, n=0;

间隔内包含的0.5ms的半帧的起始符号的数目。When Δf _RA ∈ {15, 30, 60, 120} kHz, n represents

The number of start symbols of a 0.5ms field contained within the interval.

由高层信令k0来指示，现有的协议中规定，在现有的OFDM基带信号生成过程中，需要保证在同一载波上以不同SCS所部署的所有Common RB中的子载波0对齐，即同一载波下的所有Common RB的边界需要对齐。Among them, the above

Indicated by the high-level signaling k0, the existing protocol stipulates that in the existing OFDM baseband signal generation process, it is necessary to ensure that the subcarriers 0 in all Common RBs deployed with different SCSs on the same carrier are aligned, that is, the same The boundaries of all Common RBs under the carrier need to be aligned.

3. Related terms

The term "and/or" in this article is only an association relationship to describe the associated objects, indicating that there can be three kinds of relationships, for example, A and/or B, it can mean that A exists alone, A and B exist at the same time, and A and B exist independently B these three cases. In addition, the character "/" in this article generally indicates that the related objects before and after are an "or" relationship; in the formula, the character "/" indicates that the related objects are a "division" relationship. If not specified, "plurality" herein refers to two or more.

In order to clearly describe the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, words such as "first" and "second" are used to distinguish the same items or similar items with substantially the same functions or functions. A skilled person can understand that words such as "first" and "second" 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 an example, illustration or illustration. Any embodiments or designs described as "exemplary" or "such as" in the embodiments of the present invention should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present the related concepts in a specific manner. In the embodiments of the present invention, unless otherwise specified, the meaning of "plurality" refers to two or more.

The technical solutions provided by the present application will be introduced below with reference to the accompanying drawings.

The technical solution provided by the present invention can be applied to various communication systems, for example, a 5G communication system, a future evolution system or a variety of communication fusion systems, and so on. It can include a variety of application scenarios, such as machine to machine (M2M), D2M, macro-micro communication, enhanced mobile Internet (enhance Mobile Broadband, eMBB), ultra-reliable & low-latency communication (ultra Reliable & Low Latency Communication (uRLLC) and Massive Machine Type Communication (mMTC) and other scenarios. These scenarios include but are not limited to scenarios such as communication between terminals, or communication between network devices and network devices, or communication between network devices and terminals. The embodiments of the present invention can be applied to communication between a network device and a terminal in a 5G communication system, or communication between a terminal and a terminal, or communication between a network device and a network device.

FIG. 1 shows a possible schematic structural diagram of a communication system involved in an embodiment of the present invention. As shown in FIG. 1 , the communication system includes a transmitter device 100 and a receiver device 200 .

Exemplarily, after the transmitting end device 100 in the embodiment of the present invention generates the OFDM baseband signal, the OFDM baseband signal may be up-converted to a carrier frequency and sent to the receiving end device 200 .

In this embodiment of the present invention, the above-mentioned sending end device 100 may be a network device, or may be a terminal device, which is not limited in the present invention. For example, for downlink, the transmitting end device 100 is a network device, and the receiving end device 200 is a terminal device; for uplink, the transmitting end device 100 is a terminal device, and the receiving end device 200 is a network device.

The above-mentioned network device 100 may be a base station, a core network device, a transmission and reception point (Transmission and Reception Point, TRP), a relay station, an access point, or the like. The network device 100 may be a base transceiver station (Base Transceiver Station, BTS) in a global system for mobile communication (Global System for Mobile communication, GSM) or a code division multiple access (Code Division Multiple Access, CDMA) network, or a wideband code The NB (NodeB) in Wideband Code Division Multiple Access (WCDMA) may also be an eNB or an eNodeB (evolutional NodeB) in LTE. The network device 100 may also be a wireless controller in a cloud radio access network (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. However, the use of words does not constitute a limitation of the present invention.

Terminal 200 may be a wireless terminal or a wired terminal, which may be a device that provides voice and/or other service data connectivity to a user, a handheld device with wireless communication capabilities, a computing device, or other processing device connected to a wireless modem equipment, in-vehicle equipment, wearable devices, terminals in the future 5G network or terminals in the future evolved PLMN network, etc. A wireless terminal may communicate with one or more core networks via a Radio Access Network (RAN), and the wireless terminal may be a mobile terminal such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal , for example, may be portable, pocket-sized, hand-held, computer-built, or vehicle-mounted mobile devices that exchange language and/or data with a wireless access network, as well as Personal Communication Service (PCS) telephones, cordless telephones, Session Initiation Protocol (Session Initiation Protocol, SIP) phone, Wireless Local Loop (Wireless Local Loop, WLL) station, Personal Digital Assistant (Personal Digital Assistant, PDA) and other devices, wireless terminals can also be mobile devices, user equipment (UserEquipment, UE), UE terminal, access terminal, wireless communication equipment, terminal unit, terminal station, mobile station (MobileStation), mobile station (Mobile), remote station (Remote Station), remote station, remote terminal (RemoteTerminal), subscriber unit (Subscriber Unit), subscriber station (Subscriber Station), user agent (UserAgent), terminal device, etc. As an example, in the embodiment of the present invention, FIG. 1 shows that the terminal is a mobile phone as an example.

The execution body of the method for generating an OFDM baseband signal provided by the embodiment of the present invention may be an apparatus for generating an OFDM baseband signal, and the apparatus for generating an OFDM baseband signal may be a transmitting end device, or the transmitting end device can implement the method for generating an OFDM baseband signal The specific functional modules and/or functional entities can be determined according to actual usage requirements, which are not limited in this embodiment of the present invention. The method for generating an OFDM baseband signal provided by the embodiment of the present invention is exemplarily described below by taking the transmitting end device as an example.

FIG. 2 shows a schematic flowchart of a method for generating an OFDM baseband signal provided by an embodiment of the present invention. As shown in FIG. 2 , the signal generating method may include:

S201. The transmitting end device acquires the difference between the first frequency and the second frequency.

The transmitting end device in the embodiment of the present invention may be the transmitting end device in the communication system shown in FIG. 1 , for example, a base station.

In the embodiment of the present invention, the above-mentioned first frequency is the center frequency of the frequency bandwidth of the common resource blocks in the first resource set, that is, the first frequency may be the frequency bandwidth of all or part of the common resource blocks in the first resource set. The center frequency, for example, if the above-mentioned first resource set includes N common resource blocks, the above-mentioned first frequency is the center frequency of the frequency bandwidth occupied by the N common resource blocks in the first resource set. The above-mentioned first resource set is mapped on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the above-mentioned first OFDM baseband signal is one OFDM baseband signal corresponding to the first OFDM symbol among the M OFDM baseband signals.

In the embodiment of the present invention, the above-mentioned second frequency plays the role of the reference frequency in the embodiment of the present invention, so as to ensure that the boundaries of common resource blocks transmitted at different subcarrier intervals are aligned. Therefore, the second frequency in the embodiment of the present invention is The specific frequency value of the frequency is not limited in the present invention, and can be any value.

Optionally, in this embodiment of the present invention, the above-mentioned second frequency may be a frequency of OFDM baseband signal modulation and frequency up-conversion, that is, after the above-mentioned M OFDM baseband signals are generated, the transmitting end device will generate M OFDM baseband signals. Modulated and upconverted to the second frequency for transmission. Since the OFDM baseband signal is modulated and up-converted, the OFDM baseband signal is modulated to a higher frequency and the second frequency 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, at this time, the above-mentioned second frequency may be one of the frequencies within the frequency bandwidth of the first carrier, for example, The above-mentioned second frequency may be the center frequency of the first carrier, the center frequency of the resource grid configured at any subcarrier interval in the first carrier, or any other within the frequency bandwidth of the first carrier. The frequency may also be a frequency in a specific frequency set of the first carrier, which is not limited in the present invention.

It should be noted that the resource set in this embodiment of the present invention may be a resource grid (resourcegrid) specified in a standard, or may be a resource set composed of common resource blocks for transmitting SSB.

Optionally, in this embodiment of the present invention, before S201, the method further includes the following steps of acquiring the first frequency:

S201a1. The transmitting end device acquires parameter information of the first resource set carried in the high-level signaling from the high-level signaling delivered by the network device.

The above-mentioned parameter information of the first resource set includes, but is not limited to: the frequency corresponding to the boundary of the first common resource block in the first resource set, the number of common resource blocks in the first resource set, and the subsections corresponding to the first resource set Carrier spacing and frequency f _pointA of the frequency reference point.

S201a2. The transmitting end device calculates the center frequency of the frequency bandwidth of the first resource set according to the parameter information.

Exemplarily, the transmitting end device calculates the frequency corresponding to the boundary of the first common resource block of the first resource set, the number of common resource blocks of the first resource set, the subcarrier spacing corresponding to the first resource set, and f _pointA . the frequency bandwidth of the first resource set, and then determine the center frequency of the frequency bandwidth.

Optionally, in this embodiment of the present invention, the common resource blocks in the above-mentioned first resource set are common resource blocks for transmitting SSB. Exemplarily, before S201, the method further includes the following steps of acquiring the first frequency:

S201b, the transmitting end device acquires the first frequency carried in the high-level signaling from the high-level signaling indicated by the network device.

Exemplarily, for a non-cell defining SSB (that is, an SSB that does not carry the search information of the scheduling system information PDCCH), the high-level signaling indicated by the network device will carry an absolute frequency point position, and the frequency point position is the first transmission SSB. The center frequency of a resource set.

Optionally, in this embodiment of the present invention, the common resource blocks in the above-mentioned first resource set are common resource blocks for transmitting SSB. Exemplarily, before S201, the method further includes the following steps of acquiring the first frequency:

S201c1. The transmitting end device acquires the parameter information of the SSB carried in the high-layer signaling from the high-layer signaling indicated by the network device.

S201c2, the transmitting end device calculates the first frequency according to the parameter information and the frequency calculation formula.

传输SSB的第一个公共资源块的边界与频率参考点之间以第一频率间隔Δf_unit,1为单位的公共资源块数量N_offset、第二频率间隔Δf_unit,2、SSB的子载波间隔Δf_SSB以及传输SSB的公共资源块的数量

上述的Δf_unit,2为SSB的第一个子载波与传输SSB的第一个公共资源块的边界间的频率间隔。The above parameter information includes: the frequency f _pointA of the frequency reference point, the number of subcarriers in each RB

Between the boundary of the first common resource block of the transmission SSB and the frequency reference point, the number of common resource blocks N _offset with the first frequency interval Δf _unit,1 as the unit, the second frequency interval Δf _unit,2 , the subcarrier interval of the SSB Δf _SSB and the number of common resource blocks that transmit SSB

The above Δf _unit,2 is the frequency interval between the first subcarrier of the SSB and the boundary of the first common resource block for transmitting the SSB.

The above frequency calculation formula is:

Exemplarily, for the cell defining SSB (that is, the SSB that can be searched by the terminal in the cell search and carries the search information of the scheduling system information PDCCH), the high-level signaling indicated by the network device will carry the parameter information of the SSB, based on With the parameter information, the center frequency of the first resource set for transmitting the SSB can be determined.

S202. The transmitting end device determines the 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.

T_C、

In this embodiment of the present invention, the time domain information corresponding to the above-mentioned first OFDM symbol includes:

T _C ,

用于补偿第一频率f₁ ^μ和第二频率f₂之间的频率差。In a possible example, for OFDM baseband signal generation other than PRACH, the above-mentioned phase offset

Used to compensate for the frequency difference between the first frequency f ₁ ^μ and the second frequency f ₂ .

具体用于补偿15kHz子载波间隔的资源格的中心频率和第一载波的中心频率之间的频率差。Example 1: If the first frequency f ₁ ^μ is the center frequency of the resource cell for transmitting the 15kHz OFDM baseband signal (ie μ=0), and the second frequency f ₂ is the center frequency of the first carrier, then

Specifically, it is used to compensate the frequency difference between the center frequency of the resource grid with the 15 kHz subcarrier spacing and the center frequency of the first carrier.

具体用于补偿30kHz子载波间隔的资源的中心频率和第一载波的中心频率之间的频率差。Example 2: If the first frequency f ₁ ^μ is the center frequency of the resource for transmitting the OFDM baseband signal of the 30kHz SSB (ie μ=1), and the second frequency f ₂ is the center frequency of the first carrier, then

Specifically, it is used to compensate the frequency difference between the center frequency of the resource with the 30 kHz subcarrier spacing and the center frequency of the first carrier.

用于补偿第一频率f₁ ^μ和第二频率f₂之间的频率差。In another possible example, for the OFDM baseband signal generation of PRACH, the above-mentioned phase offset

Used to compensate for the frequency difference between the first frequency f ₁ ^μ and the second frequency f ₂ .

具体用于补偿15kHz子载波间隔的资源格的中心频率和第一载波的中心频率之间的频率差。Example 3: If the first frequency f ₁ ^μ is the center frequency of the 15 kHz subcarrier-spaced resource cell of the OFDM baseband signal transmitting PRACH (that is, μ=0), and the second frequency f ₂ is the center frequency of the first carrier, then

Specifically, it is used to compensate the frequency difference between the center frequency of the resource grid with the 15 kHz subcarrier spacing and the center frequency of the first carrier.

S203. The transmitting 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.

Exemplarily, in this embodiment of the present invention, when the transmitting end device generates the first OFDM baseband signal, it may be implemented in the following two implementation manners:

The first possible implementation:

In this implementation manner, the transmitting end device can directly perform phase compensation in the process of generating the OFDM baseband signal.

Optionally, in this embodiment of the present invention, S203 may be specifically implemented by the following steps:

S203a. The transmitting 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 formula for generating the OFDM baseband signal.

Exemplarily, in this embodiment of the present invention, the foregoing formula for generating an OFDM baseband signal includes at least the following two forms:

Form 1 (for OFDM baseband signal generation other than PRACH):

The above OFDM baseband signal generation formula can be shown in the following formula 7:

in,

Form 2 (Generation of OFDM baseband signal for PRACH):

The above OFDM baseband signal generation formula can be shown in the following formula 8:

Wherein, the above-mentioned K=Δf/Δf _RA (that is, the above formula 4);

Second possible implementation:

In this implementation manner, the transmitting 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 this embodiment of the present invention, S203 may be specifically implemented by the following steps:

S203b1. The transmitting end device performs phase compensation on the data symbols of the resource elements carried on the first OFDM symbol according to the phase offset.

S203b2. The transmitting end device generates a first OFDM baseband signal according to the phase-compensated data symbols of the resource elements carried on the first OFDM symbol.

来表示，发送端设备在OFDM基带信号生成之前，可以将

与

相乘来对第一OFDM符号上承载的资源粒子的数据符号进行相位补偿，然后，再采用如下公式生成OFDM基带信号。Exemplarily, if the data symbols of resource elements carried on the first OFDM symbol are

to indicate that before the OFDM baseband signal is generated, the transmitting end device can

and

Multiply to perform phase compensation on the data symbols of the resource elements carried on the first OFDM symbol, and then use the following formula to generate an OFDM baseband signal.

The above OFDM baseband signal generation formula can be shown in the following formula 9, which is used for OFDM baseband signal generation except PRACH:

The above OFDM baseband signal generation formula can be shown in the following formula 10, which is used for the generation of the OFDM baseband signal of PRACH:

Wherein, the above-mentioned K=Δf/Δf _RA (that is, the above formula 4);

In the method for generating an OFDM baseband signal provided by the embodiment of the present invention, in the process of generating the OFDM baseband signal, the embodiment of the present invention determines the frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency and the The time domain information of any OFDM symbol on the M OFDM symbols mapped in the first resource set determines the phase offset of the OFDM symbol, so that the center frequency of the frequency bandwidth of the common resource blocks in the first resource set is equal to Phase compensation is performed on the frequency difference between the second frequencies to ensure that the boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, which can avoid phase deviations in the generated OFDM baseband signals, thereby improving communication efficiency.

体现了同一载波上以不同SCS所传输的Common RB的边界的位置关系，从而可以保证生成的OFDM基带信号可以在正确的频率位置上发送，使得同一载波上以不同SCS所传输的所有Common RB中的子载波0对齐。然而，上述的

需要高层信令指示给终端侧，从而引入了额外的信令开销。In addition, in the prior art, the network equipment is introduced into the OFDM baseband signal formula by introducing

It reflects the positional relationship of the boundaries of Common RBs transmitted by different SCSs on the same carrier, so that the generated OFDM baseband signal can be sent at the correct frequency position, so that all Common RBs transmitted by different SCSs on the same carrier subcarrier 0 is aligned. However, the above

High-layer signaling is required to indicate to the terminal side, thereby introducing additional signaling overhead.

使得整个过程无需高层信令指示的

节省了额外的信令开销。Therefore, the OFDM baseband signal generation formula applied by the OFDM baseband signal generation method provided by the embodiment of the present invention does not include

So that the whole process does not need to be indicated by high-level signaling

Additional signaling overhead is saved.

As shown in FIG. 3, an embodiment of the present invention provides an apparatus for generating an OFDM baseband signal. The apparatus 300 includes: an obtaining module 301, a determining module 302, and a generating module 303, wherein:

The obtaining module 301 is used to obtain the difference between the first frequency and the second frequency; wherein, the above-mentioned first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and the above-mentioned first resource set is mapped on On the 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 among the M OFDM baseband signals.

The determining module 302 is configured to determine the phase offset corresponding to the first OFDM baseband signal according to the difference value obtained by the obtaining module 301 and the time domain information corresponding to the first OFDM symbol.

The generating module 303 is configured to generate a first OFDM baseband signal according to the phase offset determined by the determining module 302 and the data symbols of the resource elements carried on the first OFDM symbol.

Optionally, as shown in FIG. 3 , the apparatus 300 further includes: a sending module 304, wherein:

The sending module 304 is configured to modulate and up-convert the M OFDM baseband signals generated by the generating module 303 to a second frequency for sending.

Optionally, the above generating module 303 is specifically configured to: perform phase compensation on the data symbols of the resource particles carried on the first OFDM symbol according to the phase offset determined by the determining module 302; according to the resources carried on the first OFDM symbol The phase-compensated data symbols of the particles generate a first OFDM baseband signal.

Optionally, the common resource block in the above-mentioned first resource set is a common resource block for transmitting the synchronization signal block SSB; the obtaining module 301 is further configured to obtain, from the high-level signaling indicated by the network device, the first information carried by the high-level signaling. frequency.

Optionally, the common resource block in the above-mentioned first resource set is a common resource block for transmitting the synchronization signal block SSB; the obtaining module 301 is further configured to obtain the SSB information carried by the high-level signaling from the high-level signaling indicated by the network device. parameter information, the first frequency is calculated according to the parameter information and the frequency calculation formula.

传输SSB的第一个公共资源块的边界与频率参考点之间以第一频率间隔Δf_unit,1为单位的公共资源块数量N_offset、第二频率间隔Δf_unit,2、SSB的子载波间隔Δf_SSB以及传输SSB的公共资源块的数量

Δf_unit,2为SSB的第一个子载波与传输SSB的第一个公共资源块的边界间的频率间隔；频率计算公式为：

The parameter information includes: the frequency f _pointA of the frequency reference point, the number of subcarriers in each RB

Between the boundary of the first common resource block of the transmission SSB and the frequency reference point, the number of common resource blocks N _offset with the first frequency interval Δf _unit,1 as the unit, the second frequency interval Δf _unit,2 , the subcarrier interval of the SSB Δf _SSB and the number of common resource blocks that transmit SSB

Δf _unit,2 is the frequency interval between the first subcarrier of SSB and the boundary of the first common resource block for transmitting SSB; the frequency calculation formula is:

An OFDM baseband signal generating apparatus provided by an embodiment of the present invention, in the process of generating an OFDM baseband signal, the apparatus according to the frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency and the first The time domain information of any OFDM symbol on the M OFDM symbols mapped in the resource set determines the phase offset of the OFDM symbol, so that the center frequency of the frequency bandwidth of the common resource block in the first resource set is compared with that of the second OFDM symbol. Phase compensation is performed on the frequency difference between frequencies to ensure that the boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, which can avoid phase deviations in the generated OFDM baseband signals, thereby improving communication efficiency.

The apparatus for generating an OFDM baseband signal provided by the embodiment of the present invention can implement the process shown in FIG. 2 in the foregoing method embodiment, and to avoid repetition, details are not described herein again.

4 is a schematic diagram of a hardware structure of an apparatus for generating an OFDM baseband signal according to an embodiment of the present invention. 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 the first frequency and the second frequency; wherein the first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and the first resource set Mapping on M OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is an OFDM baseband signal corresponding to the first OFDM symbol among the M OFDM baseband signals; according to the difference value and the corresponding first OFDM symbol The time domain information of the first OFDM baseband signal is determined, and the phase offset corresponding to the first OFDM baseband signal is determined; the first OFDM baseband signal is generated according to the phase offset and the data symbols of the resource particles carried on the first OFDM symbol.

An OFDM baseband signal generating apparatus provided by an embodiment of the present invention, in the process of generating an OFDM baseband signal, the apparatus according to the frequency difference between the center frequency of the frequency bandwidth of the common resource block in the first resource set and the second frequency and the first The time domain information of any OFDM symbol on the M OFDM symbols mapped in the resource set determines the phase offset of the OFDM symbol, so that the center frequency of the frequency bandwidth of the common resource block in the first resource set is compared with that of the second OFDM symbol. Phase compensation is performed on the frequency difference between frequencies to ensure that the boundaries of common resource blocks transmitted at different subcarrier intervals are aligned, which can avoid phase deviations in the generated OFDM baseband signals, thereby improving communication efficiency.

In this embodiment of the present invention, in FIG. 4 , the bus architecture may include any number of interconnected buses and bridges, specifically, one or more processors represented by the processor 401 and various circuits of the memory represented by the memory 403 are linked together . The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 402 may be a number of elements, including a transmitter and a receiver, that provide a means for communicating with various other devices 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 apparatus 400 for generating an OFDM baseband signal further includes some functional modules not shown, which will not be repeated here.

Optionally, an embodiment of the present invention further provides a sending end device, including a processor, a memory, a computer program stored in the memory and running on the processor, and the computer program is executed by the processor to implement the first embodiment above. The process of the method for generating the OFDM baseband signal in , and can achieve the same technical effect, in order to avoid repetition, it will not be repeated here.

Embodiments of the present invention further provide 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, implements multiple processes of the OFDM baseband signal generation method in the foregoing embodiment, and The same technical effect can be achieved, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium is, for example, a read-only memory (Read-Only Memory, ROM for short), a random access memory (Random Access Memory, RAM for short), a magnetic disk, or an optical disk.

It should be noted that, herein, the terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, It also includes other elements not expressly listed or inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

From the description of the above embodiments, those skilled in the art can clearly understand that the method of the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course can also be implemented by hardware, but in many cases the former is better implementation. Based on this understanding, the technical solutions of the present invention can be embodied in the form of software products in essence or the parts that make contributions to the prior art, and the computer software products are stored in a storage medium (such as ROM/RAM, magnetic disk, CD-ROM), including several instructions to make a terminal (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) execute the methods described in the various embodiments of the present invention.

The embodiments of the present invention have been described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific embodiments, which are merely illustrative rather than restrictive. Under the inspiration of the present invention, without departing from the spirit of the present invention and the scope protected by the claims, many forms can be made, which all belong to the protection of the present invention.

Claims (14)

1. A method for generating an orthogonal frequency division multiplexing OFDM baseband signal, characterized in that the method comprises: obtaining the difference between the first frequency and the second frequency; wherein the first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and 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 among the M OFDM baseband signals; determining a phase offset corresponding to the first OFDM baseband signal according to the difference and time domain information corresponding to the first OFDM symbol; The first OFDM baseband signal is generated according to the phase offset and the data symbols of the resource elements carried on the first OFDM symbol. 2. The method according to claim 1, wherein after generating the first OFDM baseband signal according to the phase offset and data symbols of resource elements carried on the first OFDM symbol, The method also includes: The generated M OFDM baseband signals are modulated and up-converted to the second frequency for transmission. 3 . The method according to claim 1 , wherein the generating the first OFDM baseband signal according to the phase offset and data symbols of resource elements carried on the first OFDM symbol, comprising: 3 . : performing phase compensation on the data symbols of the resource elements carried on the first OFDM symbol according to the phase offset; The first OFDM baseband signal is generated according to the phase-compensated data symbols of the resource elements carried on the first OFDM symbol. 4. The method according to any one of claims 1 to 3, wherein the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; Before acquiring the difference between the first frequency and the second frequency, the method further includes: The first frequency carried by the high-layer signaling is acquired from the high-layer signaling indicated by the network device. 5. The method according to any one of claims 1 to 3, wherein the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; Before acquiring the difference between the first frequency and the second frequency, the method further includes: Obtain the parameter information of the SSB carried by the high-layer signaling from the high-layer signaling indicated by the network device; Calculate the first frequency according to the parameter information and the frequency calculation formula; The parameter information includes: the frequency f _pointA of the frequency reference point, the number of subcarriers in each RB

The number of common resource blocks N _offset in units of the first frequency interval Δf _unit,1 , the second frequency interval Δf _unit,2 , the The subcarrier spacing Δf _SSB of the SSB and the number of common resource blocks used to transmit the SSB

The Δf _unit,2 is the frequency interval between the first subcarrier of the SSB and the boundary of the first common resource block for transmitting the SSB; The frequency calculation formula is:

The method according to claim 1, wherein the first resource set is a resource set transmitted on a first carrier; the second frequency is one of frequencies within a frequency bandwidth of the first carrier . 7. A device for generating an orthogonal frequency division multiplexing OFDM baseband signal, characterized in that it comprises: An acquisition module, configured to acquire the difference between the first frequency and the second frequency; wherein the first frequency is the center frequency of the frequency bandwidth of the common resource block in the first resource set, and the first resource set is mapped on M On the number of OFDM symbols, one OFDM symbol corresponds to one OFDM baseband signal, and the first OFDM baseband signal is an OFDM baseband signal corresponding to the first OFDM symbol among 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 value obtained by the obtaining module and the 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 the data symbols of the resource elements carried on the first OFDM symbol. 8. The device according to claim 7, wherein the device further comprises: A sending module, configured to modulate and up-convert the M OFDM baseband signals generated by the generating module to the second frequency for sending. 9. The apparatus according to claim 7, wherein the generating module is specifically used for: performing phase compensation on the data symbols of the resource elements carried on the first OFDM symbol according to the phase offset; The first OFDM baseband signal is generated according to the phase-compensated data symbols of the resource elements carried on the first OFDM symbol. 10. The apparatus according to any one of claims 7 to 9, wherein the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; The obtaining module is further configured to obtain the first frequency carried by the high-layer signaling from the high-layer signaling indicated by the network device. 11. The apparatus according to any one of claims 7 to 9, wherein the common resource block in the first resource set is a common resource block for transmitting a synchronization signal block SSB; The obtaining module is further configured to obtain the parameter information of the SSB carried by the high-layer signaling from the high-layer signaling indicated by the network device, and calculate the first frequency according to the parameter information and the frequency calculation formula ; The parameter information includes: the frequency f _pointA of the frequency reference point, the number of subcarriers in each RB

The number of common resource blocks N _offset in units of the first frequency interval Δf _unit,1 , the second frequency interval Δf _unit,2 , the The subcarrier spacing Δf _SSB of the SSB and the number of common resource blocks used to transmit the SSB

The Δf _unit,2 is the frequency interval between the first subcarrier of the SSB and the boundary of the first common resource block for transmitting the SSB; The frequency calculation formula is:

12. The apparatus according to claim 7, wherein the first resource set is a resource set transmitted on a first carrier; the second frequency is one of frequencies within a frequency bandwidth of the first carrier . 13. An OFDM baseband signal generating apparatus, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, when the computer program is executed by the processor Steps for implementing the method for generating an OFDM baseband signal as claimed in any one of claims 1 to 6. 14. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the OFDM according to any one of claims 1 to 6 is implemented Steps of a baseband signal generation method.

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