CN111431553B - Signal transmission method, system, electronic device and storage medium - Google Patents

Signal transmission method, system, electronic device and storage medium Download PDF

Info

Publication number
CN111431553B
CN111431553B CN202010171942.1A CN202010171942A CN111431553B CN 111431553 B CN111431553 B CN 111431553B CN 202010171942 A CN202010171942 A CN 202010171942A CN 111431553 B CN111431553 B CN 111431553B
Authority
CN
China
Prior art keywords
energy
offset
subcarrier
radio frequency
signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010171942.1A
Other languages
Chinese (zh)
Other versions
CN111431553A (en
Inventor
茆晓军
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Spreadtrum Communications Shanghai Co Ltd
Original Assignee
Spreadtrum Communications Shanghai Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Spreadtrum Communications Shanghai Co Ltd filed Critical Spreadtrum Communications Shanghai Co Ltd
Priority to CN202010171942.1A priority Critical patent/CN111431553B/en
Publication of CN111431553A publication Critical patent/CN111431553A/en
Priority to PCT/CN2021/075653 priority patent/WO2021179865A1/en
Application granted granted Critical
Publication of CN111431553B publication Critical patent/CN111431553B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0002—Modulated-carrier systems analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line
    • 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
    • H04L27/2626—Arrangements specific to the transmitter only
    • 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
    • H04L27/2647—Arrangements specific to the receiver only

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

The invention discloses a signal transmission method, a system, an electronic device and a storage medium, wherein the signal transmission method comprises the following steps: receiving or transmitting radio frequency signals; the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal; frequency shifting the radio frequency signal in an analog domain, and frequency shifting the time domain baseband signal in a digital domain. The offset direction corresponding to the radio frequency signal is opposite to the offset direction corresponding to the time domain baseband signal and has the same offset, and the offset is smaller than the subcarrier interval. The invention changes the strong interference of DC to a single subcarrier into the weak interference to two adjacent subcarriers, thus reducing the influence of DC on the performance of a receiving system on the whole; meanwhile, the DC estimation value is more accurate, so that the DC is more effectively removed, and the performance of a receiving system is improved.

Description

Signal transmission method, system, electronic device and storage medium
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a signal transmission method, a signal transmission system, an electronic device, and a storage medium.
Background
The LTE (long term evolution) system uses an OFDM (orthogonal frequency division multiplexing) technique in which a DC (direct current component) subcarrier is located at a 0Hz subcarrier shift of a baseband signal, i.e., at the center of the entire carrier band in a carrier of the LTE system.
In an NR (new air interface) system, all subcarriers may carry data, including the subcarrier where DC is located. However, when the DC subcarrier carries data, severe interference may be generated to the carried data, resulting in degradation of demodulation performance of the DC subcarrier, thereby affecting data reception performance and failing to meet actual data transmission requirements; in addition, when DC estimation is performed, a deviation is easily generated in the DC estimation value, and DC cannot be completely removed, thereby further reducing data reception performance.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a signal transmission method, a system, an electronic device, and a storage medium, in order to overcome the defects that in the prior art, a DC subcarrier causes severe interference to data to be carried, and cannot completely remove DC, which affects data reception performance.
The invention solves the technical problems through the following technical scheme:
the invention provides a signal transmission method, which comprises the following steps:
receiving or transmitting radio frequency signals;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the energy of the DC subcarrier position and the single subcarrier on the frequency domain corresponds to a first coincidence degree;
frequency shifting the radio frequency signal in an analog domain and frequency shifting the time domain baseband signal in a digital domain;
the offset direction corresponding to the radio frequency signal is opposite to the offset direction corresponding to the time domain baseband signal and has the same offset, and the offset is smaller than the subcarrier interval;
the DC sub-carrier position offsetting the offset to a target DC sub-carrier position;
the energy of the DC of the target DC subcarrier position and the energy of the single subcarrier on the frequency domain correspond to a second coincidence degree, and the coincidence degree is smaller than the first coincidence degree.
Preferably, when receiving the rf signal, the step of frequency shifting the rf signal in the analog domain and the step of frequency shifting the time-domain baseband signal in the digital domain includes:
after the radio frequency signal is subjected to frequency shift by a first offset on an analog domain, the time domain baseband signal is subjected to reverse frequency shift by the first offset on a digital domain;
wherein the first offset is less than the subcarrier spacing.
Preferably, when transmitting the radio frequency signal, the step of frequency shifting the radio frequency signal in an analog domain and the step of frequency shifting the time domain baseband signal in a digital domain comprises:
after frequency shifting the time domain baseband signal by a first offset amount on a digital domain, reversely frequency shifting the radio frequency signal by the first offset amount on an analog domain;
wherein the first offset is less than the subcarrier spacing.
Preferably, the first offset is half the subcarrier spacing.
Preferably, when transmitting a plurality of radio frequency signals, the step of frequency shifting the radio frequency signals in an analog domain and the step of frequency shifting the time-domain baseband signals in a digital domain comprises:
respectively carrying out frequency shift on each radio frequency signal in an analog domain, and carrying out frequency shift on the time domain baseband signal of each radio frequency signal in a digital domain;
wherein the offsets corresponding to different radio frequency signals are the same or different.
Preferably, the step of frequency shifting the rf signal in the analog domain and the step of frequency shifting the time-domain baseband signal in the digital domain further comprises:
continuously receiving or transmitting N OFDM (orthogonal frequency division multiplexing) symbols within a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
obtaining a first energy sample value of the target DC subcarrier position of each OFDM symbol;
acquiring a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are not correlated;
calculating to obtain a DC estimated value according to the first energy sampling value and the second energy sampling value;
removing the DC estimate in the time-domain baseband signal.
Preferably, when N is 1, the step of calculating the DC estimate value according to the first energy sample value and the second energy sample value includes:
and determining the DC estimated value according to the first energy sampling value and the second energy sampling value corresponding to one OFDM symbol.
Preferably, when N > 1, the step of calculating the DC estimate value according to the first energy sample value and the second energy sample value comprises:
and respectively carrying out summation average filtering processing on the first energy sampling value and the second energy sampling value corresponding to each OFDM symbol to obtain the DC estimated value.
Preferably, the step of performing sum-average filtering processing on the first energy sample value and the second energy sample value corresponding to each OFDM symbol to obtain the DC estimated value corresponds to the following calculation formula:
Figure BDA0002409480240000031
wherein,
Figure BDA0002409480240000032
representing said DC estimate, i representing the ith said OFDM symbol, N representing the total number of said OFDM symbols received or transmitted, f0+ Δ f/2 denotes the subcarrier frequency at which DC is present, f0And f0+ Δ f denotes and f, respectively0+ Δ f/2 adjacent two subcarrier frequencies, DiRepresenting the first energy sample value, Ii-LDenotes f0The time-domain baseband signal at f0The second energy sample value at + Δ f/2, Ii-RDenotes f0The time-domain baseband signal at + Δ f is at f0The second energy sample value at + Δ f/2.
The invention also provides a signal transmission system, which comprises a radio frequency signal transmission module and an offset processing module;
the radio frequency signal transmission module is used for receiving or transmitting radio frequency signals;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the energy of the DC subcarrier position and the single subcarrier on the frequency domain corresponds to a first coincidence degree;
the offset processing module is used for carrying out frequency offset on the radio-frequency signal on an analog domain and carrying out frequency offset on the time domain baseband signal on a digital domain;
the offset direction corresponding to the radio frequency signal is opposite to the offset direction corresponding to the time domain baseband signal and has the same offset, and the offset is smaller than the subcarrier interval;
the energy of the DC of the target DC subcarrier position and the energy of the single subcarrier on the frequency domain correspond to a second coincidence degree, and the coincidence degree is smaller than the first coincidence degree.
Preferably, when receiving the radio frequency signal, the offset processing module is configured to reverse frequency-shift the time-domain baseband signal by a first offset amount in a digital domain after frequency-shifting the radio frequency signal by the first offset amount in an analog domain;
wherein the first offset is less than the subcarrier spacing.
Preferably, when the radio frequency signal is transmitted, the offset processing module is configured to reverse frequency-shift the radio frequency signal by a first offset amount in an analog domain after frequency-shifting the time-domain baseband signal by the first offset amount in a digital domain;
wherein the first offset is less than the subcarrier spacing.
Preferably, the first offset is half the subcarrier spacing.
Preferably, when a plurality of radio frequency signals are transmitted, the offset processing module is configured to frequency-offset each of the radio frequency signals in an analog domain and frequency-offset the time-domain baseband signal of each of the radio frequency signals in a digital domain, respectively;
wherein the offsets corresponding to different radio frequency signals are the same or different.
Preferably, the signal transmission system further comprises a symbol transmission module, a first energy sampling module, a second energy sampling module, an estimation value acquisition module and a removal module;
the symbol transmission module is used for continuously receiving or transmitting N OFDM symbols in a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
the first energy sampling module is configured to obtain a first energy sampling value of the target DC subcarrier position of each OFDM symbol;
the second energy sampling module is configured to obtain a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are not correlated;
the estimated value acquisition module is used for calculating a DC estimated value according to the first energy sampling value and the second energy sampling value;
the removal module is configured to remove the DC estimate in the time-domain baseband signal.
Preferably, when N is 1, the estimated value obtaining module is configured to determine the DC estimated value according to the first energy sample value and the second energy sample value corresponding to one OFDM symbol.
Preferably, when N > 1, the estimated value obtaining module is configured to perform sum-average filtering processing on the first energy sample value and the second energy sample value corresponding to each OFDM symbol respectively to obtain the DC estimated value.
Preferably, the estimated value obtaining module obtains a calculation formula corresponding to the DC estimated value by calculation as follows:
Figure BDA0002409480240000051
wherein,
Figure BDA0002409480240000052
representing said DC estimate, i representing the ith said OFDM symbol, N representing the total number of said OFDM symbols received or transmitted, f0+ Δ f/2 denotes the subcarrier frequency at which DC is present, f0And f0+ Δ f denotes and f, respectively0+ Δ f/2 adjacent two subcarrier frequencies, DiRepresenting the first energy sample value, Ii-LDenotes f0The time-domain baseband signal at f0The second energy sample value at + Δ f/2, Ii-RDenotes f0The time-domain baseband signal at + Δ f is at f0The second energy sample value at + Δ f/2.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the signal transmission method when executing the computer program.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which is characterized in that the computer program realizes the steps of the above-mentioned signal transmission method when being executed by a processor.
The positive progress effects of the invention are as follows:
(1) through offsetting the DC subcarrier by half subcarrier (or other offsets) when RF (radio frequency signals) are received or transmitted and inverting the frequency to offset the same subcarrier when the digital baseband is processed, the strong interference of the DC to a single subcarrier is changed into weak interference to two adjacent subcarriers, so that the influence of the DC to the performance of a receiving system is reduced on the whole.
(2) More accurate DC estimation value can be obtained, thereby more effectively removing DC and improving the performance of a receiving system.
(3) The method can be applied to a receiving end to reduce the influence of DC generated by a receiving end analog device and improve the performance of a receiver; the method can also be applied to a transmitting end to reduce the influence of DC generated by a transmitting end analog device on the receiving end and improve the receiving performance of the receiving end.
Drawings
Fig. 1 is a flowchart of a signal transmission method according to embodiment 1 of the present invention.
Fig. 2 is a first spectrum diagram in the signal transmission method according to embodiment 1 of the present invention.
Fig. 3 is a second spectrum diagram in the signal transmission method according to embodiment 1 of the present invention.
Fig. 4 is a flowchart of a signal transmission method according to embodiment 2 of the present invention.
Fig. 5 is a frequency spectrum diagram in the signal transmission method according to embodiment 2 of the present invention.
Fig. 6 is a flowchart of a signal transmission method according to embodiment 3 of the present invention.
Fig. 7 is a block diagram of a signal transmission system according to embodiment 4 of the present invention.
Fig. 8 is a block diagram of a signal transmission system according to embodiment 6 of the present invention.
Fig. 9 is a schematic structural diagram of an electronic device implementing a signal transmission method according to embodiment 7 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
The signal transmission method of this embodiment may be applied to a receiving end, and may also be applied to a transmitting end.
As shown in fig. 1, the signal transmission method of the present embodiment includes:
s101, receiving or transmitting a radio frequency signal;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the DC at the DC subcarrier location corresponds to a first overlap ratio with the energy of the individual subcarriers in the frequency domain.
Specifically, the received or transmitted radio frequency signal is:
Figure BDA0002409480240000071
wherein r (t) represents a radio frequency signal, s(p，μ)Representing time-domain basebandSignal, p denotes the antenna port of the receiving end or the transmitting end, μ is the indication ( values 0, 1, 2 …) for different subcarrier spacings, f0Denoted as the carrier center frequency, i.e., the subcarrier frequency at which DC is located.
In this case, as shown in fig. 2, the horizontal axis represents the frequency subcarrier position, and the vertical axis represents the frequency domain energy. The dotted line part indicates DC energy, and the solid line part indicates energy of data.
It can be known that, at the position of the DC subcarrier, the coincidence degree of the single subcarrier corresponding to the time domain baseband signal carried by the DC subcarrier and the DC subcarrier on the frequency domain is the main energy completely coincident, that is, the DC causes strong interference to the single subcarrier at this time.
S102, carrying out frequency offset on the radio frequency signal in an analog domain, and carrying out frequency offset on the time domain baseband signal in a digital domain;
wherein, the shift direction corresponding to the radio frequency signal is opposite to the shift direction corresponding to the time domain baseband signal and the shift amount delta f1The same; Δ f < 01< Δ f, Δ f is the subcarrier spacing;
the energy of the DC of the target DC subcarrier position and the single subcarrier on the frequency domain corresponds to a second coincidence degree, and the second coincidence degree is smaller than the first coincidence degree.
At this time, the DC subcarrier position is also shifted by Δ f1As shown in fig. 3, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers, so that the error correction of the decoding module is facilitated, the influence of the DC on the performance of the receiving system is reduced as a whole, and the data receiving performance is improved as a whole.
When the method is used at a receiving end, the influence of DC generated by a receiving end analog device is reduced, so that the performance of a receiver is improved; when the method is applied to the transmitting end, the influence of the DC generated by the analog device of the transmitting end on the receiving end is reduced, so that the receiving performance of the receiving end is improved.
In this embodiment, the DC subcarrier is shifted during RF reception or transmission, and the same offset is shifted in reverse frequency during digital baseband processing, so that the effect of changing the strong interference of the DC to a single subcarrier into the weak interference to two adjacent subcarriers is achieved, the influence of the DC on the performance of the reception system is reduced as a whole, and the data reception performance is improved.
Example 2
The information transmission method of the present embodiment is a further improvement of embodiment 1, and specifically:
when transmitting a plurality of radio frequency signals, step S102 includes:
respectively carrying out frequency offset on each radio frequency signal in an analog domain, and carrying out frequency offset on a time domain baseband signal of each radio frequency signal in a digital domain;
wherein, the corresponding offsets of different radio frequency signals are the same or different.
As shown in fig. 4, when receiving a radio frequency signal, step S102 includes:
s1021, after the radio frequency signal is subjected to frequency offset on an analog domain by a first offset, the time domain baseband signal is subjected to reverse frequency offset on a digital domain by the first offset;
wherein the first offset is less than the subcarrier spacing. Or,
when transmitting the radio frequency signal, step S102 includes:
s1022, after the time domain baseband signal is subjected to frequency offset on a digital domain by a first offset, the radio frequency signal is subjected to reverse frequency offset on an analog domain by the first offset;
wherein the first offset is less than the subcarrier spacing.
Preferably, the first offset is half a subcarrier spacing. At this time, the radio frequency signal is expressed as:
Figure BDA0002409480240000081
after the offset processing, as shown in fig. 3, the energy relationship between the DC at the offset target DC subcarrier position and the data carried by the target DC subcarrier in the frequency domain can be obtained, and it can be known that the DC and the single subcarrier (f)0And f0+ Δ f), i.e. to change the strong DC interference on a single subcarrier to oneThe effect of weak interference of two adjacent subcarriers.
As shown in fig. 5, when the sampling cases of the DC energy at different positions on the frequency domain are considered separately:
(1) when DC is not offset by half a subcarrier, the DC subcarrier position f0The sampling values of (a) are:
Figure BDA0002409480240000091
wherein i denotes the ith OFDM symbol,
Figure BDA0002409480240000092
at the DC sub-carrier frequency f for the data part energy0Sampling values of positions, DiAt the DC sub-carrier frequency f for the DC part of the energy0The sampled value of the location. If DC remains substantially unchanged for the duration of symbol (OFDM symbol), DC is on subcarrier f0The effect of + Δ f is negligible.
(2) DC sub-carrier position f after DC offset by half a sub-carrier0The sampling values of (a) are:
Figure BDA0002409480240000093
at subcarrier f0The sample value at the + Δ f position is:
Figure BDA0002409480240000094
in terms of the strength of the disturbance, Di-L＜Di，Di-R＜Di。
Therefore, after the DC subcarrier is shifted by half Δ f/2, as shown in fig. 3, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers, thereby facilitating the error correction of the decoding module, reducing the influence of the DC on the performance of the receiving system as a whole, and improving the data receiving performance as a whole.
In this embodiment, the DC subcarrier is shifted by half of the subcarrier during RF reception or transmission, and is shifted by half of the subcarrier in the reverse frequency direction during digital baseband processing, so that the strong interference of the DC to a single subcarrier is changed into weak interference to two adjacent subcarriers, and the influence of the DC on the performance of the reception system is reduced as a whole, thereby improving the data reception performance.
Example 3
As shown in fig. 6, the information transmission method of the present embodiment is a further improvement of embodiment 2, and specifically:
s103, continuously receiving or transmitting N OFDM symbols in a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
s104, acquiring a first energy sampling value of a target DC subcarrier position of each OFDM symbol;
s105, acquiring a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are uncorrelated;
s106, calculating to obtain a DC estimated value according to the first energy sampling value and the second energy sampling value;
and when N is equal to 1, determining the DC estimated value according to the first energy sampling value and the second energy sampling value corresponding to one OFDM symbol.
And when N is larger than 1, respectively carrying out summation average filtering processing on the first energy sampling value and the second energy sampling value corresponding to each OFDM symbol to obtain a DC estimated value.
Specifically, the calculation formula corresponding to the step of calculating the DC estimation value is as follows:
Figure BDA0002409480240000101
wherein,
Figure BDA0002409480240000102
representing the DC estimate, i represents the ith OFDM symbol, N represents the total number of received or transmitted OFDM symbols, f0+ Δ f/2 denotes the subcarrier frequency at which DC is present, f0And f0+ Δ f denotes and f, respectively0+ Δ f/2 adjacent two subcarrier frequencies, DiRepresenting the first energy sample value, Ii-LDenotes f0At f time domain baseband signal0Second energy sample value at + Δ f/2, Ii-RDenotes f0Time-domain baseband signal at + Δ f at f0A second energy sample value at + Δ f/2.
And S107, removing the DC estimated value from the time-domain baseband signal.
The following is a detailed description with reference to examples:
(1) continuously receiving or transmitting N OFDM symbols within a set time period according to a radio frequency signal, wherein N is greater than 1;
(2) acquiring a first energy sampling value Di of a target DC subcarrier position of an ith OFDM symbol;
(3) obtaining a subcarrier f adjacent to a target DC subcarrier position of an ith OFDM symbol0And f0+ Δ f second energy sample value I at target DC subcarrier locationi-LAnd adjacent subcarriers f0+ Δ f second energy sample value I at target DC subcarrier locationi-R；
(4) The calculation formula of the DC estimation value is as follows:
Figure BDA0002409480240000111
energy overlap ratio reduction from single adjacent subcarrier and DC position, Ii-LLess than adjacent sub-carriers f0Energy corresponding to data carried by the DC sub-carrier, Ii-RLess than adjacent sub-carriers f0The energy corresponding to the data carried by the DC sub-carrier at + Δ f, thereby reducing the interference strength.
In addition, Ii-LAnd Ii-RThere is no correlation between the two, thereby enhancing the DC estimation interference term 1/N
Figure BDA0002409480240000112
This makes the DC estimation more accurate.
In the embodiment, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers by offsetting the DC subcarrier by half a subcarrier during RF reception or transmission and offsetting by half a subcarrier by reverse frequency during digital baseband processing, so that the influence of the DC on the performance of a receiving system is reduced as a whole, and the data reception performance is improved; meanwhile, the DC estimation value is more accurate, so that the DC is more effectively removed, and the performance of a receiving system is further improved.
Example 4
The signal transmission method of this embodiment may be applied to a receiving end, and may also be applied to a transmitting end, that is, to a base station and to a UE.
As shown in fig. 7, the signal transmission system of the present embodiment includes a radio frequency signal transmission module 1 and an offset processing module 2.
The radio frequency signal transmission module 1 is used for receiving or sending radio frequency signals;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the energy of the DC subcarrier position and the single subcarrier on the frequency domain corresponds to a first coincidence degree;
specifically, the received or transmitted radio frequency signal is:
Figure BDA0002409480240000113
wherein r (t) represents a radio frequency signal, s(p，μ)Denotes the time domain baseband signal, p denotes the antenna port of the receiving end or the transmitting end, μ is the indication ( values 0, 1, 2 …) for different subcarrier spacings, f0Denoted as the carrier center frequency, i.e., the subcarrier frequency at which DC is located.
In this case, as shown in fig. 2, the horizontal axis represents the frequency subcarrier position, and the vertical axis represents the frequency domain energy. The dotted line part indicates DC energy, and the solid line part indicates energy of data. It can be known that, at the position of the DC subcarrier, the main energies of the DC and the single subcarrier corresponding to the time-domain baseband signal carried by the DC subcarrier completely coincide in the frequency domain, that is, at this time, the DC causes strong interference to the single subcarrier.
The offset processing module 2 is used for performing frequency offset on the radio frequency signal in an analog domain and performing frequency offset on the time domain baseband signal in a digital domain;
wherein, the shift direction corresponding to the radio frequency signal is opposite to the shift direction corresponding to the time domain baseband signal and the shift amount delta f1The same; Δ f < 01< Δ f, Δ f is the subcarrier spacing;
the energy of the DC of the target DC subcarrier position and the single subcarrier on the frequency domain corresponds to a second coincidence degree, and the second coincidence degree is smaller than the first coincidence degree.
At this time, the DC subcarrier position is also shifted by Δ f1As shown in fig. 3, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers, so that the error correction of the decoding module is facilitated, the influence of the DC on the performance of the receiving system is reduced as a whole, and the data receiving performance is improved as a whole.
In this embodiment, the DC subcarrier is shifted by half of the subcarrier during RF reception or transmission, and is shifted by half of the subcarrier in the reverse frequency direction during digital baseband processing, so that the strong interference of the DC to a single subcarrier is changed into weak interference to two adjacent subcarriers, and the influence of the DC on the performance of the reception system is reduced as a whole, thereby improving the data reception performance.
Example 5
The signal transmission system of the present embodiment is a further improvement of embodiment 4, specifically:
when transmitting various radio frequency signals, the offset processing module 2 is used for respectively carrying out frequency offset on each radio frequency signal in an analog domain and carrying out frequency offset on a time domain baseband signal of each radio frequency signal in a digital domain;
wherein, the corresponding offsets of different radio frequency signals are the same or different.
When receiving a radio frequency signal, the offset processing module 2 is configured to perform frequency offset on the radio frequency signal in an analog domain by a first offset, and then perform reverse frequency offset on a time domain baseband signal in a digital domain by the first offset;
wherein the first offset is less than the subcarrier spacing. Or,
when sending the radio frequency signal, the offset processing module 2 is configured to perform frequency offset on the time domain baseband signal in the digital domain by a first offset, and then perform reverse frequency offset on the radio frequency signal in the analog domain by the first offset;
wherein the first offset is less than the subcarrier spacing.
Preferably, the first offset is half a subcarrier spacing. At this time, the radio frequency signal is expressed as:
Figure BDA0002409480240000131
after the offset processing, as shown in fig. 3, the energy relationship between the DC at the offset target DC subcarrier position and the data carried by the target DC subcarrier in the frequency domain can be obtained, and it can be known that the DC and the single subcarrier (f)0And f0The energy overlap ratio of + Δ f) is reduced, i.e., the effect of changing the strong interference of DC to a single subcarrier to the weak interference to two adjacent subcarriers is achieved.
As shown in fig. 5, when the sampling cases of the DC energy at different positions on the frequency domain are considered separately:
(1) when DC is not offset by half a subcarrier, the DC subcarrier position f0The sampling values of (a) are:
Figure BDA0002409480240000132
wherein i denotes the ith OFDM symbol,
Figure BDA0002409480240000133
at the DC sub-carrier frequency f for the data part energy0Sampling value of position，DiAt the DC sub-carrier frequency f for the DC part of the energy0The sampled value of the location. If DC remains substantially unchanged for the duration of symbol (OFDM symbol), DC is on subcarrier f0The effect of + Δ f is negligible.
(2) DC sub-carrier position f after DC offset by half a sub-carrier0The sampling values of (a) are:
Figure BDA0002409480240000134
at subcarrier f0The sample value at the + Δ f position is:
Figure BDA0002409480240000135
in terms of the strength of the disturbance, Di-L＜Di，Di-R＜Di。
Therefore, after the DC subcarrier is shifted by half Δ f/2, as shown in fig. 3, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers, thereby facilitating the error correction of the decoding module, reducing the influence of the DC on the performance of the receiving system as a whole, and improving the data receiving performance as a whole.
In this embodiment, the DC subcarrier is shifted by half of the subcarrier during RF reception or transmission, and is shifted by half of the subcarrier in the reverse frequency direction during digital baseband processing, so that the strong interference of the DC to a single subcarrier is changed into weak interference to two adjacent subcarriers, and the influence of the DC on the performance of the reception system is reduced as a whole, thereby improving the data reception performance.
Example 6
As shown in fig. 8, the signal transmission system of the present embodiment is a further improvement of embodiment 5, specifically:
the signal transmission system further comprises a symbol transmission module 3, a first energy sampling module 4, a second energy sampling module 5, an estimated value acquisition module 6 and a removal module 7.
The symbol transmission module 3 is used for continuously receiving or transmitting N OFDM symbols in a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
the first energy sampling module 4 is configured to obtain a first energy sampling value of a target DC subcarrier position of each OFDM symbol;
the second energy sampling module 5 is configured to obtain a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are uncorrelated;
the estimated value acquisition module 6 is used for calculating a DC estimated value according to the first energy sampling value and the second energy sampling value;
when N is equal to 1, the estimated value obtaining module 6 is configured to determine the DC estimated value according to the first energy sample value and the second energy sample value corresponding to one OFDM symbol.
And when N is greater than 1, the estimated value obtaining module 6 is configured to perform sum-average filtering processing on the first energy sample value and the second energy sample value corresponding to each OFDM symbol to obtain a DC estimated value.
Specifically, the estimated value obtaining module 6 obtains a calculation formula corresponding to the DC estimated value by calculation as follows:
Figure BDA0002409480240000141
wherein,
Figure BDA0002409480240000151
representing the DC estimate, i represents the ith OFDM symbol, N represents the total number of received or transmitted OFDM symbols, f0+ Δ f/2 denotes the subcarrier frequency at which DC is present, f0And f0+ Δ f denotes and f, respectively0+ Δ f/2 adjacent two subcarrier frequencies, DiRepresenting the first energy sample value, Ii-LDenotes f0At f time domain baseband signal0Second energy at + Δ f/2Sampling value, Ii-RDenotes f0Time-domain baseband signal at + Δ f at f0A second energy sample value at + Δ f/2.
The removal module 7 is configured to remove the DC estimate in the time-domain baseband signal.
The following is a detailed description with reference to examples:
(1) continuously receiving or transmitting N OFDM symbols within a set time period according to a radio frequency signal, wherein N is greater than 1;
(2) acquiring a first energy sampling value Di of a target DC subcarrier position of an ith OFDM symbol;
(3) obtaining a subcarrier f adjacent to a target DC subcarrier position of an ith OFDM symbol0And f0+ Δ f second energy sample value I at target DC subcarrier locationi-LAnd adjacent subcarriers f0+ Δ f second energy sample value I at target DC subcarrier locationi-R；
(4) The calculation formula of the DC estimation value is as follows:
Figure BDA0002409480240000152
energy overlap ratio reduction from single adjacent subcarrier and DC position, Ii-LLess than adjacent sub-carriers f0Energy corresponding to data carried by the DC sub-carrier, Ii-RLess than adjacent sub-carriers f0The energy corresponding to the data carried by the DC sub-carrier at + Δ f, thereby reducing the interference strength.
In addition, Ii-LAnd Ii-RThere is no correlation between the two, thereby enhancing the DC estimation interference term 1/N
Figure BDA0002409480240000153
This makes the DC estimation more accurate.
In the embodiment, the strong interference of the DC to a single subcarrier is changed into the weak interference to two adjacent subcarriers by offsetting the DC subcarrier by half a subcarrier during RF reception or transmission and offsetting by half a subcarrier by reverse frequency during digital baseband processing, so that the influence of the DC on the performance of a receiving system is reduced as a whole, and the data reception performance is improved; meanwhile, the DC estimation value is more accurate, so that the DC is more effectively removed, and the performance of a receiving system is further improved.
Example 7
Fig. 9 is a schematic structural diagram of an electronic device according to embodiment 7 of the present invention. The electronic device comprises a memory, a processor and a computer program which is stored on the memory and can run on the processor, and when the processor executes the program, the signal transmission method corresponding to any one of the embodiments 1 to 3 is realized. The electronic device 30 shown in fig. 9 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiment of the present invention.
As shown in fig. 9, the electronic device 30 may be embodied in the form of a general purpose computing device, which may be, for example, a server device. The components of the electronic device 30 may include, but are not limited to: the at least one processor 31, the at least one memory 32, and a bus 33 connecting the various system components (including the memory 32 and the processor 31).
The bus 33 includes a data bus, an address bus, and a control bus.
The memory 32 may include volatile memory, such as Random Access Memory (RAM)321 and/or cache memory 322, and may further include Read Only Memory (ROM) 323.
Memory 32 may also include a program/utility 325 having a set (at least one) of program modules 324, such program modules 324 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The processor 31 executes various functional applications and data processing, such as a signal transmission method corresponding to any one of embodiments 1 to 3 of the present invention, by running a computer program stored in the memory 32.
The electronic device 30 may also communicate with one or more external devices 34 (e.g., keyboard, pointing device, etc.). Such communication may be through input/output (I/O) interfaces 35. Also, model-generating device 30 may also communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the Internet) via network adapter 36. As shown in FIG. 9, network adapter 36 communicates with the other modules of model-generating device 30 via bus 33. It should be understood that although not shown in the figures, other hardware and/or software modules may be used in conjunction with the model-generating device 30, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (disk array) systems, tape drives, and data backup storage systems, etc.
It should be noted that although in the above detailed description several units/modules or sub-units/modules of the electronic device are mentioned, such a division is merely exemplary and not mandatory. Indeed, the features and functionality of two or more of the units/modules described above may be embodied in one unit/module according to embodiments of the invention. Conversely, the features and functions of one unit/module described above may be further divided into embodiments by a plurality of units/modules.
Example 8
The present embodiment provides a computer-readable storage medium on which a computer program is stored, the program, when executed by a processor, implementing the steps corresponding to the signal transmission method corresponding to any one of embodiments 1 to 3.
Wherein the readable storage medium may be more particularly according to may include but is not limited to: a portable disk, a hard disk, random access memory, read only memory, erasable programmable read only memory, optical storage device, magnetic storage device, or any suitable combination of the foregoing.
In a possible implementation manner, the present invention can also be implemented in a form of a program product, which includes a program code, and when the program product runs on a terminal device, the program code is configured to enable the terminal device to execute steps corresponding to a signal transmission method corresponding to any one of the embodiments 1 to 3.
Where program code for carrying out the invention is written in any combination of one or more programming languages, the program code may execute entirely on the user device, partly on the user device, as a stand-alone software package, partly on the user device and partly on a remote device or entirely on the remote device.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims (20)

1. A signal transmission method, characterized in that the signal transmission method comprises:
receiving or transmitting radio frequency signals;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the energy of the DC subcarrier position and the single subcarrier on the frequency domain corresponds to a first coincidence degree;
frequency shifting the radio frequency signal in an analog domain and frequency shifting the time domain baseband signal in a digital domain;
the offset direction corresponding to the radio frequency signal is opposite to the offset direction corresponding to the time domain baseband signal and has the same offset, and the offset is smaller than the subcarrier interval;
the DC sub-carrier position offsetting the offset to a target DC sub-carrier position;
the energy of the DC of the target DC subcarrier position and the energy of the single subcarrier on the frequency domain correspond to a second coincidence degree, and the second coincidence degree is smaller than the first coincidence degree.
2. The signal transmission method of claim 1, wherein the step of frequency shifting the radio frequency signal in an analog domain and the time-domain baseband signal in a digital domain when receiving the radio frequency signal comprises:
after the radio frequency signal is subjected to frequency shift by a first offset on an analog domain, the time domain baseband signal is subjected to reverse frequency shift by the first offset on a digital domain;
wherein the first offset is less than the subcarrier spacing.
3. The signal transmission method of claim 1, wherein the step of frequency shifting the radio frequency signal in an analog domain and the step of frequency shifting the time domain baseband signal in a digital domain when transmitting the radio frequency signal comprises:
after frequency shifting the time domain baseband signal by a first offset amount on a digital domain, reversely frequency shifting the radio frequency signal by the first offset amount on an analog domain;
wherein the first offset is less than the subcarrier spacing.
4. A method of signal transmission according to claim 2 or 3, wherein the first offset is half the subcarrier spacing.
5. The signal transmission method of claim 1, wherein when transmitting a plurality of said radio frequency signals, said step of frequency shifting said radio frequency signals in an analog domain and said step of frequency shifting said time-domain baseband signals in a digital domain comprises:
respectively carrying out frequency shift on each radio frequency signal in an analog domain, and carrying out frequency shift on the time domain baseband signal of each radio frequency signal in a digital domain;
wherein the offsets corresponding to different radio frequency signals are the same or different.
6. The signal transmission method of claim 1, wherein the step of frequency shifting the radio frequency signal in an analog domain and frequency shifting the time domain baseband signal in a digital domain further comprises:
continuously receiving or transmitting N OFDM symbols within a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
obtaining a first energy sample value of the target DC subcarrier position of each OFDM symbol;
acquiring a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are not correlated;
calculating to obtain a DC estimated value according to the first energy sampling value and the second energy sampling value;
removing the DC estimate in the time-domain baseband signal.
7. The signal transmission method of claim 6, wherein when N is 1, the step of calculating the DC estimate from the first energy sample and the second energy sample comprises:
and determining the DC estimated value according to the first energy sampling value and the second energy sampling value corresponding to one OFDM symbol.
8. The signal transmission method of claim 6, wherein when N > 1, the step of calculating a DC estimate from the first energy sample and the second energy sample comprises:
and respectively carrying out summation average filtering processing on the first energy sampling value and the second energy sampling value corresponding to each OFDM symbol to obtain the DC estimated value.
9. The signal transmission method according to claim 8, wherein the step of performing sum-average filtering on the first energy sample value and the second energy sample value corresponding to each OFDM symbol to obtain the DC estimate corresponds to the following calculation formula:
Figure FDA0002409480230000031
wherein,
Figure FDA0002409480230000032
representing said DC estimate, i representing the ith said OFDM symbol, N representing the total number of said OFDM symbols received or transmitted, f0+. DELTA.f/2 denotes the subcarrier frequency at which DC is present, f0And f0+. DELTA.f denotes and f, respectively0Two adjacent subcarrier frequencies of +. DELTA.f/2, DiRepresenting the first energy sample value, Ii-LDenotes f0The time-domain baseband signal at f0The second energy sample value at +. DELTA.f/2, Ii-RDenotes f0The time-domain baseband signal at f0The second energy sample value at +. DELTA.f/2.
10. A signal transmission system is characterized by comprising a radio frequency signal transmission module and an offset processing module;
the radio frequency signal transmission module is used for receiving or transmitting radio frequency signals;
the radio frequency signal comprises a time domain baseband signal and a subcarrier carrying the time domain baseband signal;
the energy of the DC subcarrier position and the single subcarrier on the frequency domain corresponds to a first coincidence degree;
the offset processing module is used for carrying out frequency offset on the radio-frequency signal on an analog domain and carrying out frequency offset on the time domain baseband signal on a digital domain;
the offset direction corresponding to the radio frequency signal is opposite to the offset direction corresponding to the time domain baseband signal and has the same offset, and the offset is smaller than the subcarrier interval;
the energy of the DC of the target DC subcarrier position and the energy of the single subcarrier on the frequency domain correspond to a second coincidence degree, and the second coincidence degree is smaller than the first coincidence degree.
11. The signal transmission system of claim 10, wherein when receiving the radio frequency signal, the offset processing module is configured to reverse frequency offset the time domain baseband signal by a first offset amount in the digital domain after frequency shifting the radio frequency signal by the first offset amount in the analog domain;
wherein the first offset is less than the subcarrier spacing.
12. The signal transmission system of claim 10, wherein when transmitting the radio frequency signal, the offset processing module is configured to reverse frequency-offset the radio frequency signal by a first offset amount in an analog domain after frequency-offsetting the time-domain baseband signal by the first offset amount in a digital domain;
wherein the first offset is less than the subcarrier spacing.
13. The signal transmission system of claim 11 or 12, wherein the first offset is half the subcarrier spacing.
14. The signal transmission system of claim 10, wherein when transmitting a plurality of radio frequency signals, the offset processing module is configured to frequency-shift each of the radio frequency signals in an analog domain and frequency-shift the time-domain baseband signal of each of the radio frequency signals in a digital domain;
wherein the offsets corresponding to different radio frequency signals are the same or different.
15. The signal transmission system according to claim 10, wherein the signal transmission system further comprises a symbol transmission module, a first energy sampling module, a second energy sampling module, an estimation value acquisition module, and a removal module;
the symbol transmission module is used for continuously receiving or transmitting N OFDM symbols in a set time period according to the radio frequency signal; n is more than or equal to 1 and is an integer;
the first energy sampling module is configured to obtain a first energy sampling value of the target DC subcarrier position of each OFDM symbol;
the second energy sampling module is configured to obtain a second energy sampling value of two subcarriers adjacent to the target DC subcarrier position of each OFDM symbol at the target DC subcarrier position;
the two second energy sampling values are respectively smaller than the energy values of the time domain baseband signal at two adjacent subcarriers, and the two second energy sampling values are not correlated;
the estimated value acquisition module is used for calculating a DC estimated value according to the first energy sampling value and the second energy sampling value;
the removal module is configured to remove the DC estimate in the time-domain baseband signal.
16. The signal transmission system of claim 15, wherein when N is 1, the estimate acquisition module is configured to determine the DC estimate based on the first energy sample and the second energy sample corresponding to one OFDM symbol.
17. The signal transmission system according to claim 15, wherein when N > 1, the estimated value obtaining module is configured to perform sum-average filtering processing on the first energy sample value and the second energy sample value corresponding to each OFDM symbol to obtain the DC estimated value.
18. The signal transmission system according to claim 17, wherein the estimated value obtaining module obtains the DC estimated value by calculating according to the following formula:
Figure FDA0002409480230000051
wherein,
Figure FDA0002409480230000052
representing said DC estimate, i representing the ith said OFDM symbol, N representing the total number of said OFDM symbols received or transmitted, f0+. DELTA.f/2 denotes the subcarrier frequency at which DC is present, f0And f0+. DELTA.f denotes and f, respectively0Two adjacent subcarrier frequencies of +. DELTA.f/2, DiRepresenting the first energy sample value, Ii-LDenotes f0The time-domain baseband signal at f0The second energy sample value at +. DELTA.f/2, Ii-RDenotes f0The time-domain baseband signal at f0The second energy sample value at +. DELTA.f/2.
19. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the signal transmission method according to any of claims 1-9 when executing the computer program.
20. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the signal transmission method according to any one of claims 1 to 9.
CN202010171942.1A 2020-03-12 2020-03-12 Signal transmission method, system, electronic device and storage medium Active CN111431553B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010171942.1A CN111431553B (en) 2020-03-12 2020-03-12 Signal transmission method, system, electronic device and storage medium
PCT/CN2021/075653 WO2021179865A1 (en) 2020-03-12 2021-02-05 Signal transmission method and system, electronic device, and storage medium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010171942.1A CN111431553B (en) 2020-03-12 2020-03-12 Signal transmission method, system, electronic device and storage medium

Publications (2)

Publication Number Publication Date
CN111431553A CN111431553A (en) 2020-07-17
CN111431553B true CN111431553B (en) 2021-06-04

Family

ID=71547527

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010171942.1A Active CN111431553B (en) 2020-03-12 2020-03-12 Signal transmission method, system, electronic device and storage medium

Country Status (2)

Country Link
CN (1) CN111431553B (en)
WO (1) WO2021179865A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111431553B (en) * 2020-03-12 2021-06-04 展讯通信（上海）有限公司 Signal transmission method, system, electronic device and storage medium
CN115276685B (en) * 2021-04-30 2024-05-14 华为技术有限公司 Signal processing method and communication device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499844A (en) * 2008-01-30 2009-08-05 京信通信系统（中国）有限公司 Frequency synchronization method for WCDMA system downlink receiver
CN109361634A (en) * 2018-11-21 2019-02-19 深圳市中科汉天下电子有限公司 The compensation method and system of receiver carrier wave frequency deviation

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018187970A1 (en) * 2017-04-12 2018-10-18 Oppo广东移动通信有限公司 Signal transmission method and apparatus
WO2018232367A1 (en) * 2017-06-16 2018-12-20 Intel IP Corporation Configurability and signaling for half-tone shift
CN110859007B (en) * 2018-08-24 2023-04-18 华为技术有限公司 Resource division method, resource indication method and related device
CN110190865B (en) * 2019-07-24 2019-10-15 翱捷科技(上海)有限公司 A kind of reception system and method for Internet of Things narrow band signal
CN111431553B (en) * 2020-03-12 2021-06-04 展讯通信（上海）有限公司 Signal transmission method, system, electronic device and storage medium

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101499844A (en) * 2008-01-30 2009-08-05 京信通信系统（中国）有限公司 Frequency synchronization method for WCDMA system downlink receiver
CN109361634A (en) * 2018-11-21 2019-02-19 深圳市中科汉天下电子有限公司 The compensation method and system of receiver carrier wave frequency deviation

Also Published As

Publication number Publication date
CN111431553A (en) 2020-07-17
WO2021179865A1 (en) 2021-09-16

Similar Documents

Publication Publication Date Title
US8019026B2 (en) Downlink preamble processing techniques for initial acquisition
US11005697B2 (en) Orthogonal frequency-division multiplexing equalization using deep neural network
US8085859B2 (en) Platform noise mitigation
US9065630B1 (en) Systems and methods for detecting secondary synchronization signals in a wireless communication system
US8654879B2 (en) Multi-antenna channel estimation method based on polyphase decomposition
EP2116076A1 (en) Multi transmit antenna synchronization channel transmission cell id detection
CN101909024B (en) Method and device for estimating maximum Doppler frequency offset
CN110445734B (en) Frequency offset estimation method and device, storage medium and terminal
CN111431553B (en) Signal transmission method, system, electronic device and storage medium
CN110557347B (en) Channel estimation method and communication equipment
US8428190B2 (en) Radio receiving apparatus and radio receiving method
CN115362658B (en) Apparatus and method for flexible cell selection
US20210006449A1 (en) Frequency Offset Estimation and Compensation for High Performance Wireless Communications in Substation Automation
CN111404850A (en) Uplink channel estimation method and device based on 5G system
WO2012153659A1 (en) Reception device, reception method, and computer program
JP6905432B2 (en) Wireless communication device and signal detection method
KR20070095135A (en) Apparatus and control method of inter subcarrier interface suppresion in wireless ofdma system
US9166841B2 (en) Receiving apparatus and receiving method
CN110933009B (en) Frequency offset estimation method, system, electronic device and storage medium
JP2007104574A (en) Multicarrier wireless receiver and receiving method
RU2577316C2 (en) Signal processing device, signal processing method and programme
KR100862350B1 (en) Method of Variable Point Prime Factor FFT For DRM System
US20150036770A1 (en) Reception apparatus and reception method
CN111181889B (en) Frequency offset estimation sample receiving control method, system, equipment and storage medium
CN114760177B (en) Data receiving method in multipoint-to-point system and related equipment

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant