CN115514605A - Frequency offset compensation method, device, equipment and computer readable storage medium - Google Patents
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Abstract
The embodiment of the application provides a frequency offset compensation method, a device, equipment and a storage medium, and relates to the technical field of communication. The method comprises the following steps: receiving a Physical Uplink Control Channel (PUCCH) signal; respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal; performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation; determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal in the PUCCH signal; and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor. The embodiment of the application realizes that each user equipment only carries out frequency offset compensation once per demodulation processing, can reduce the operation complexity, and is more suitable for a hardware framework of 'blind processing'.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a frequency offset compensation method, apparatus, device, and computer-readable storage medium.
Background
In 5G communication, a Physical Uplink Control Channel (PUCCH) is used to transmit Uplink Control Information (UCI), which includes HARQ-ACK (Hybrid automatic Request acknowledgement), scheduling Request (SR), and Channel State Information (CSI). There are multiple formats for PUCCH, where format 1 is for transmitting HARQ-ACK and/or SR information, and the format occupies X PUCCH symbols, where X has a value ranging from 4 to 14, and there are pilot symbols and data symbols in the X symbols, and the pilot symbols and data symbols are arranged alternately, as shown in the pattern shown in fig. 1, where P represents pilot symbols and S represents data symbols. Format 1 allows multiple user equipments to be multiplexed on the same time-frequency block by orthogonal codes, i.e. different user equipments realize multiple user equipment multiplexing by spreading codes and cyclic shifts.
In the PUCCH format 1, in the frequency offset scenario, due to the phase rotation of each PUCCH received symbol caused by the frequency offset, the detected UCI modulation symbol is power-shrunk and its constellation diagram is possibly rotated, which degrades the reception performance of the PUCCH or UCI. Therefore, the UCI modulation symbol power contraction and the constellation rotation can be recovered through a frequency offset compensation method, so as to improve the receiving performance.
However, in the prior art, frequency offset compensation needs to be performed on each PUCCH received symbol, and if there are N received symbols in one PUCCH signal, N-1 times of frequency offset compensation needs to be performed (except for the first symbol, because the frequency offset compensation factor of the first symbol is 1). If under the scene of multiple receiving antennas, (N-1) × Nant frequency offset compensation is needed, wherein Nant is the number of antennas, the operation complexity is high, and the operation amount is large.
Disclosure of Invention
The application provides a frequency offset compensation method, a device, equipment and a computer readable storage medium, which are used for solving the technical problems of high operation complexity and large operation amount when frequency offset compensation is carried out in the prior art.
In a first aspect, a method for frequency offset compensation is provided, the method comprising:
receiving a Physical Uplink Control Channel (PUCCH) signal;
respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal;
performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation;
determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
In a second aspect, there is provided a frequency offset compensation apparatus, comprising:
a receiving module, configured to receive a PUCCH signal in a PUCCH format 1 using a physical uplink control channel;
a preprocessing module, configured to perform preprocessing on a data reception symbol and a pilot reception symbol in the PUCCH signal respectively;
the channel compensation module is used for carrying out channel compensation on the preprocessed data receiving symbols according to the preprocessed pilot frequency receiving symbols and determining the data receiving symbols after the channel compensation;
the frequency offset compensation module is used for determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
In a third aspect, a frequency offset compensation apparatus is provided, the apparatus comprising:
a memory for storing a computer program;
a transceiver for receiving, under control of the processor, a PUCCH signal employing a Physical Uplink Control Channel (PUCCH) format 1;
a processor for reading the computer program in the memory and performing the following operations:
respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal;
performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation;
determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
In a fourth aspect, a processor-readable storage medium is provided, which stores a computer program for causing a processor to implement the frequency offset compensation method of the first aspect of the present application when executed.
The beneficial effect that technical scheme that this application provided brought is:
each receiving symbol in the PUCCH signal is preprocessed, then channel compensation is carried out on the preprocessed data receiving symbols based on the preprocessed pilot frequency receiving symbols, the data receiving symbols after the channel compensation are obtained, finally frequency offset compensation is carried out on the data receiving symbols after the channel compensation, and each user equipment only carries out frequency offset compensation once in each demodulation process, so that the operation complexity can be reduced, and the method is more suitable for a hardware framework of 'blind processing'.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments of the present application will be briefly described below.
Fig. 1 is a diagram illustrating a pattern of a PUCCH format 1 in the related art;
fig. 2 is a schematic flowchart of a frequency offset compensation method according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a frequency offset compensation method according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to the embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present invention.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.
To make the objects, technical solutions and advantages of the present application more clear, the following detailed description of the embodiments of the present application will be made with reference to the accompanying drawings.
The present application related to the related art is first introduced and explained:
the PUCCH has a plurality of formats, wherein the format 1 is used for transmitting HARQ-ACK and/or SR information, the format occupies X PUCCH symbols, the value range of X is 4-14, pilot symbols and data symbols are arranged in the X symbols, and the pilot symbols and the data symbols are alternately arranged. Format 1 allows multiple user equipments to be multiplexed on the same time-frequency block by orthogonal codes, i.e. different user equipments realize multiple user equipment multiplexing by spreading codes and cyclic shifts.
When frequency hopping is started, X PUCCH symbols are divided into two blocks, the first half is called a 1 st hop and is provided with a floor (X/2) PUCCH symbol, the second half is called a 2 nd hop and is provided with an X-floor (X/2) PUCCH symbol, wherein floor () is rounded downwards, all pilot symbols in each hop are multiplied by a spreading sequence to obtain all the pilot symbols after spreading in the hop, and data symbols are similar. Since each hop is usually on a different time-frequency block, each hop PUCCH symbol is demodulated separately and finally combined.
When the frequency hopping is closed, the X PUCCH symbols are not blocked, all the pilot symbols are multiplied by the spreading sequence to obtain all the pilot symbols after the spreading, the data symbols are similar, and all the PUCCH symbols are demodulated and judged because all the PUCCH symbols are on the same time-frequency block. Wherein the demodulation process typically includes de-sequencing, de-spreading, channel compensation combining, etc., i.e., symbol-level processing, and the decision is bit-level processing.
Let N be expressed as the number of PUCCH symbols for a certain 1 hop (N = floor (X/2) or N = X-floor (X/2)) when frequency hopping is on, or as the number of PUCCH symbols (N = X) when frequency hopping is off. Assuming that there are N1 data symbols and N2 pilot symbols in the N PUCCH symbols, the number of pilot symbols and the number of data symbols are different by 1, i.e., N1-N2=1 or N1-N2= -1, in view of the fact that the pilot symbols and the data symbols constitute a pattern of the PUCCH symbols. Each demodulation process is in units of N PUCCH symbols.
The PUCCH signal transmitted by the target user equipment is assumed to be of the following form:
the mth data transmission symbol is
The mth pilot transmission symbol is
Wherein x is 1 (m) and x 2 (m) is a vector of transmitted symbols, r 1 (m) and r 2 (m) is a sequence vector, the dimensions of 4 vectors are B × 1, B is equal to 12 in the current protocol, namely 12 subcarriers; s is a UCI modulation symbol, which is a scalar;
and
an exponential function with the natural constant e as the base is an element in the spread spectrum sequence vector, which is a scalar.
The PUCCH received by the target user equipment is in the following form:
1. when the first symbol in the N PUCCH symbols is pilot,
the mth data reception symbol is:
wherein m =0,1, \ 8230;, N 1 -1；
The mth pilot received symbol is:
wherein m =0,1, \8230, N 2 -1。
2. When the first symbol of the N PUCCH symbols is data,
the mth data reception symbol is:
wherein m =0,1, \8230, N 1 -1；
The mth pilot reception symbol is:
wherein m =0,1, \8230, N 2 -1。
Wherein, y 1 (m) and y 2 (m) is the received symbol vector, dimensions are B x 1 1 (m)＝diag(h 1 (m))，H 2 (m)＝diag(h 2 (m)), the matrix dimensions are B, h 1 (m) and h 2 (m) of data and pilot symbols, respectivelyThe radio channel frequency domain response vector, the vector dimensions are all B multiplied by 1, diag (x) is operated by placing the elements in the vector x on the main diagonal of the matrix in turn, the other elements of the matrix are filled with 0,
and
is phase rotation caused by frequency deviation, is scalar, f is frequency deviation, delta t is PUCCH symbol interval time, n 1 (m) and n 2 And (m) is a noise vector, and dimensions are B multiplied by 1.
The conventional common method for compensating frequency offset between symbols performs phase inverse rotation on each symbol, that is, each symbol is multiplied by a frequency offset compensation factor C (m). Usually, the frequency offset f is unknown, and is a frequency offset estimation value obtained by known sequence estimation
Among them, sequences such as SRS (Sounding reference signal), PUSCH (Physical uplink shared channel) pilot or other channel/reference signals are known. Thus, the intermediate frequency offset symbol in C (m) is
The specific formula is as follows:
1. when the first symbol of the N PUCCH symbols is pilot,
the frequency offset compensation factor of the mth data receiving symbol is:
the frequency offset compensation factor of the mth pilot frequency receiving symbol is:
2. when the first symbol of the N PUCCH symbols is data,
the frequency offset compensation factor of the mth data receiving symbol is:
the frequency offset compensation factor of the mth pilot frequency receiving symbol is:
the data symbols after the frequency offset compensation are:
when in use
When it comes to
And
if there is no frequency offset f-correlation term already, then:
m＝0,1,…,N 1 -1
m＝0,1,…,N 2 -1
then, for
And
perform de-sequence vector (remove r) 1 (m) and r 2 (m)), despreading (removal)
And
) And channel compensation and combination are carried out to obtain the estimated value of the UCI modulation symbol s
Finally, demodulation and bit decision are carried out.
Because the prior art needs to perform frequency offset compensation on each symbol, for a PUCCH signal, except for the first symbol (because the frequency offset compensation factor of the first symbol is 1), N-1 times of frequency offset compensation needs to be performed, and if in a multi-receiving antenna scenario, (N-1) × nano times of frequency offset compensation are needed, where nano is the number of antennas, and the computation amount is relatively large.
In addition, format 1 allows multiple ues to be multiplexed on the same time-frequency block, and from the product implementation perspective, some product hardware (e.g. FPGA) is more desirable to reduce signaling interaction for "blind processing" in view of operation efficiency, so that implementation architecture is more prone to "time-frequency resource block-level blind processing" + "ue level", that is: firstly, 1 time frequency resource is received and processed in a traversing way according to all possible configuration information (such as a de-sequence, a de-spreading, a channel compensation and combination, and demodulation processing), then user equipment configuration information is obtained through signaling interaction, and finally, a processing result related to the user equipment is extracted according to the user equipment configuration information to perform processing (such as demodulation, demodulation and judgment) respectively on each user equipment.
In view of the above, the present application provides a frequency offset compensation method, apparatus, device and computer readable storage medium, which are intended to solve the above technical problems in the prior art.
The following describes the technical solutions of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
The embodiment of the present application provides a frequency offset compensation method, as shown in fig. 2, the method includes:
s201, receiving a Physical Uplink Control Channel (PUCCH) signal;
s202, respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal;
specifically, in this embodiment, the preprocessing may include: and (4) performing de-sequence processing and de-spreading processing. That is, the data receiving symbol and the pilot receiving symbol in the PUCCH signal may be first subjected to de-sequence processing, and then subjected to de-spreading processing; alternatively, the data received symbol and the pilot received symbol in the PUCCH signal may be despread first, and the despread data received symbol and the despread pilot received symbol may be de-sequenced.
S203, performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation;
s204, determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
s205, according to the determined frequency offset compensation factor, performing frequency offset compensation on the data receiving symbol after channel compensation.
Specifically, in this embodiment, the pre-processed data receiving symbol is subjected to channel compensation by using the pre-processed pilot receiving symbol, so that the PUCCH signal after channel compensation does not include the pilot receiving symbol, the data receiving symbol after channel compensation is obtained, and then the data receiving symbol after channel compensation is subjected to frequency offset compensation based on the determined frequency offset compensation factor, so that frequency offset compensation of the entire PUCCH signal can be achieved. Because the sign in the PUCCH signal is firstly subjected to de-sequencing processing and de-spreading processing, and then the processed sign is subjected to channel compensation and frequency offset compensation, each user equipment only needs to perform frequency offset compensation once, and compared with the scheme that the sign in the PUCCH signal is subjected to frequency offset compensation and then is subjected to de-sequencing processing and de-spreading processing in the prior art, the calculation amount and the calculation complexity are obviously reduced.
The technical solution of the present application will be described in detail with reference to the flow shown in fig. 3.
S301, respectively performing de-sequencing on the data receiving symbol and the pilot frequency receiving symbol in the PUCCH signal to obtain the de-sequenced data receiving symbol and pilot frequency receiving symbol.
S302, the data receiving symbol and the pilot frequency receiving symbol after the sequence is decoded are respectively subjected to de-spreading processing to obtain the data receiving symbol and the pilot frequency receiving symbol after the de-spreading.
And S303, performing channel compensation on the data receiving symbol after the de-spreading by using the pilot frequency receiving symbol after the de-spreading to obtain the data receiving symbol after the channel compensation.
S304, normalizing the data receiving symbol after the channel compensation.
S305, receiving symbol number according to data (N1), pilot frequency (N2), PUCCH symbol interval time (delta t), and frequency deviation estimated value
Obtaining the compensation parameter G or the normalized compensation parameter G'.
S306, obtaining a frequency offset compensation factor C based on the compensation parameter G or the normalized compensation parameter G'.
S307, performing frequency offset compensation on the PUCCH subjected to channel compensation by using the frequency offset compensation factor.
It should be noted that, in this embodiment, S302 may also be executed before S301.
For describing the technical solution of the present application in more detail, taking the PUCCH signal with the PUCCH format 1 as the type of the received PUCCH signal as an example, a specific implementation process of the frequency offset compensation method provided in the embodiment of the present application is described with reference to a flow shown in fig. 3.
The PUCCH signal in PUCCH format 1 received by the target ue is assumed to be of the following form:
1. when the first symbol in the N PUCCH symbols is pilot,
the mth data reception symbol is:
wherein m =0,1, \ 8230;, N 1 -1；
The mth pilot reception symbol is:
wherein m =0,1, \ 8230;, N 2 -1。
2. When the first symbol of the N PUCCH symbols is data,
the mth data reception symbol is:
wherein m =0,1, \ 8230;, N 1 -1；
The mth pilot reception symbol is:
wherein m =0,1, \ 8230;, N 2 -1。
Wherein, y 1 (m) and y 2 (m) is the received symbol vector, dimensions are B x 1 1 (m)＝diag(h 1 (m))，H 2 (m)＝diag(h 2 (m)), the matrix dimensions are B, h 1 (m) and h 2 (m) radio channel frequency domain response vectors of data and pilot symbols, respectively, the vector dimensions being each Bx 1, diag (x) operating by placing the elements of the vector x in turn on the main diagonal of the matrix, the other elements of the matrix being filled with 0's,
and
is phase rotation caused by frequency deviation, is scalar, f is frequency deviation, delta t is PUCCH symbol interval time, n 1 (m) and n 2 And (m) is a noise vector, and dimensions are B multiplied by 1.
S301 may specifically be: respectively to y 1 (m) and y 2 (m) separately de-sequencing the vectors, i.e. multiplying by the respective de-sequenced vectors
And
and obtaining the PUCCH symbols after the sequence vectors are decoded.
1. When the first symbol in the N PUCCH symbols is pilot,
wherein m =0,1, \8230, N 1 -1；
Wherein m =0,1, \ 8230;, N 2 -1。
2. When the first symbol of the N PUCCH symbols is data,
wherein m =0,1, \ 8230;, N 1 -1；
Wherein m =0,1, \ 8230;, N 2 -1。
Wherein,
r H representing the conjugate transpose of r.
Assuming that the wireless channel is flat fading and coherent over the transmission time of N PUCCH symbols, i.e.
The PUCCH format received by the target user equipment is simplified as:
1. when the first symbol in the N PUCCH symbols is pilot,
wherein m =0,1, \ 8230;, N 1 -1；
Wherein m =0,1, \ 8230;, N 2 -1。
2. When the first symbol of the N PUCCH symbols is data,
wherein m =0,1, \8230, N 1 -1；
Wherein m =0,1, \ 8230;, N 2 -1。
S302 may specifically be: to pair
And
separately despread, i.e. separately multiplied by
And
and respectively combine N with 1 An
And N 2 An
And accumulating to obtain:
1. when the first symbol in the N PUCCH symbols is pilot,
2. when the first symbol of the N PUCCH symbols is data,
wherein,
s303 may specifically be: receiving a pilot symbol
For data receiving symbol
Channel compensation is performed and the signal and noise are assumed to be uncorrelated, i.e.:
1. when the first symbol of the N PUCCH symbols is pilot,
2. when the first symbol of the N PUCCH symbols is data,
wherein, y * Represents the conjugate of y, | x- 2 Represents the modulo square of x, equal to x times the conjugate of x.
G in the above formula can be obtained by the following process:
1. when the first symbol in the N PUCCH symbols is pilot,
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
then the process of the first step is carried out,
since pilot symbols and data symbols are alternately arranged, when the first symbol of N PUCCH symbols is a pilot, only N symbols exist 1 ＝N 2 And N 1 ＝N 2 -1 two cases.
When e is j2πfΔt·2 When the ratio is not less than 1,
G＝N 1 N 2 e j2πfΔt
2. when the first symbol of the N PUCCH symbols is data,
when e is j2πfΔt·2 When the number is not equal to 1,
then the process of the first step is carried out,
due to pilot symbols and dataThe symbols are arranged alternately, so that when the first symbol of N PUCCH symbols is data, only N symbols exist 1 ＝N 2 And N 1 ＝N 2 +1 two cases.
When e is j2πfΔt·2 When the ratio is not less than 1,
G＝N 1 N 2 e -j2πfΔt
unifying the G formulas of the two scenes of the first symbol as the pilot and the data in the N PUCCH symbols as follows:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the pressure is not greater than 1, the pressure is lower than 1,
G＝N 1 N 2 e ±j2πfΔt
as can be seen from the unified formula, G is composed of two parts, i.e., phase and amplitude, with the phase part being F and the amplitude part being a, i.e., G = FA, and the unified formula can be represented by the following formula:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
F＝e ±j2πfΔt ,A＝N 1 N 2
wherein, the sign value condition is as follows: the first symbol in the N PUCCH symbols is positive when the pilot is present, and the first symbol in the N PUCCH symbols is negative when the data is present.
When the number of reception antennas or reception beams or reception ports is P, that is, y 1 (m) and y 2 (m) P respectively if each y 1 (m) and y 2 If the frequency offsets f in (m) are different, P G's can be calculated separately, if each y is different 1 (m) and y 2 The frequency offset f in (m) is the same (usually the same), as long as 1G is calculated.
S304 may specifically be: channel normalization of z, i.e. division by
And the signal and noise are assumed to be uncorrelated, i.e.:
1. when the first symbol in the N PUCCH symbols is pilot,
wherein,
2. when the first symbol of the N PUCCH symbols is data,
wherein,
d in the above formula can be obtained by the following process:
1. when the first symbol in the N PUCCH symbols is pilot,
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the pressure is not greater than 1, the pressure is lower than 1,
2. when the first symbol of the N PUCCH symbols is data,
when e is j2πfΔt·2 When the number is not equal to 1,
when e is j2πfΔt·2 When the pressure is not greater than 1, the pressure is lower than 1,
unifying the D formulas of the two scenes that the first symbol in the N PUCCH symbols is pilot and data as follows:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
combining G and D above, one can obtain:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
g '(i.e., normalized G) is also composed of two components, phase and amplitude, the phase component being F', the amplitude component being a ', i.e., G' = F 'a', represented by the following equation:
when e is j2πfΔt·2 When the number is not equal to 1,
when e is j2πfΔt·2 When the pressure is not greater than 1, the pressure is lower than 1,
wherein, the sign value condition is as follows: the first symbol in the N PUCCH symbols is positive when the pilot is present, and the first symbol in the N PUCCH symbols is negative when the data is present.
When there are P receiving antennas or receiving beams or receiving ports, that is to say y 1 (m) and y 2 (m) P respectively if each y 1 (m) and y 2 If the frequency offsets f in (m) are different, P G's can be computed, respectively, if each y is 1 (m) and y 2 The frequency offsets f in (m) are the same (usually the same), as long as 1G' is calculated.
It should be noted that other expressions of G and G' above, and phase portions and amplitude portions derived from other expressions are within the scope of the embodiments of the present application.
E.g. using the formula for multiple angles j2πfΔt·2 G and G' obtained when not equal to 1:
can be simplified into the following steps:
or,
wherein,
is a formula of a combined number, and the formula is,
indicates the number of all combinations of taking 2i elements out of 2N different elements,
similarly.
Can be simplified into:
or,
s305 may specifically be: according to the formula for calculating G or G' obtained above, the number of data received symbols (N1), the number of pilot received symbols (N2), the PUCCH symbol interval time (Δ t), and the frequency offset estimation value
G or G' is obtained.
S306 may specifically be: the frequency offset compensation factor C is obtained based on the following formula.
Or,
Considering that the UCI modulation symbols transmitted in the PUCCH format 1 are BPSK (Binary Phase Shift Keying) or QPSK (Quadrature Phase Shift Keying), which are relatively low-order modulation schemes, and are sensitive to the positive and negative of the Phase rotation and amplitude caused by the frequency offset, but not sensitive to the magnitude of the amplitude, therefore, the frequency offset compensation factor C can be obtained by simplifying the following formula:
C＝F * sign (A) when G ≠ 0
Wherein sign (a) represents the sign of a, and sign (a) =1 when the sign is positive and sign (a) = -1 when the sign is negative.
Or,
C＝F′ * sign (A ') when G' ≠ 0
Wherein sign (a) represents the sign of a, and sign (a) =1 when the sign is positive and sign (a) = -1 when the sign is negative.
Due to e j2πfΔt·2 Not equal to 1 and N 1 ≠N 2 When F and F ′ All are 1, so under this condition C can be further simplified by the following formula:
c = sign (a) when G ≠ 0,
or,
c = sign (A ') when G' ≠ 0
It should be understood that in the embodiment of the present application, the frequency offset compensation factor may not be calculated in real time, and all possible combinations of N1, N2 and Δ t and all quantized values may be combined in advance
Substituting into the above formula to obtain C, recording with table,then, according to N1, N2, delta t and frequency offset estimation value
And looking up a table to obtain a corresponding frequency offset compensation factor.
Wherein, all quantized
It can be understood that: all frequency offset estimates determined from the range of frequency offset estimates in fixed steps, for example: the range of the estimated frequency deviation value is (-10 Hz,10 Hz), the step length is 1, and all the quantized values are obtained
The method comprises the following steps: -10Hz, -9Hz, -8Hz, -7Hz, -6Hz, -5Hz, -4Hz, -3Hz, -2Hz, -1Hz,0Hz,1Hz,2Hz,3Hz,4Hz,5Hz,6Hz,7Hz,8Hz,9Hz,10Hz. It should be understood that this example does not set any limit to the technical solutions of the embodiments of the present application.
S307 may specifically be: and multiplying the PUCCH subjected to channel compensation by a frequency offset compensation factor C.
When there are a plurality of receiving antennas, receiving beams, or receiving ports, for example, P, the following two cases are included:
in the first case, when P received PUCCH signals correspond to the same frequency offset estimation value
When the temperature of the water is higher than the set temperature,
s11, obtaining a G or G 'for the P received PUCCH signals by adopting the formula for calculating the G or G' obtained in the S304;
s12, obtaining a frequency offset compensation factor C by adopting any formula for calculating C in S306;
and S13, combining the P PUCCHs subjected to channel compensation with multiple receiving antennas or multiple receiving beams or multiple receiving ports, and multiplying the combined PUCCHs by a frequency offset compensation factor C, so that in a multi-receiving antenna scene, frequency offset compensation is still required to be performed for 1 time for each demodulation processing of user equipment, and compared with (N-1) × Nant frequency offset compensation in the prior art, the complexity can be greatly reduced.
Or,
s21, obtaining P G or G 'aiming at P receiving PUCCH signals by adopting a formula for calculating G or G' obtained in S304;
s22, obtaining P frequency offset compensation factors C by adopting any formula for calculating C in S306;
and S23, multiplying the P PUCCHs subjected to channel compensation by corresponding frequency offset compensation factors C respectively, and combining multiple receiving antennas, multiple receiving beams or multiple receiving ports.
By adopting the mode, nant frequency offset compensation is carried out when each user equipment is demodulated, and compared with (N-1) Nant frequency offset compensation in the prior art, the complexity can be greatly reduced.
Therefore, in the technical solution of the embodiment of the present application, in the process of performing despreading, not only each data received symbol needs to be multiplied by
Receive symbol multiplication for each pilot
And will despread N 1 Accumulating the received data symbols, and despreading N 2 The pilot frequency receiving symbols are accumulated, and then the accumulated pilot frequency receiving symbols are utilized to perform channel compensation on the accumulated data receiving symbols, so that the PUCCH after the channel compensation does not contain the pilot frequency receiving symbols, and the frequency offset compensation is performed for all the data receiving symbols in the PUCCH during the frequency offset compensation.
Second case, when P received PUCCH signals correspond to different frequency deviation estimated values
When the temperature of the water is higher than the set temperature,
s21, obtaining P G or G 'S for P received PUCCH signals by using the formula for calculating G or G' obtained in S304;
s22, obtaining P frequency offset compensation factors C by adopting any formula for calculating C in S306;
and S23, multiplying the P PUCCHs subjected to channel compensation by corresponding frequency offset compensation factors C respectively, and combining multiple receiving antennas, multiple receiving beams or multiple receiving ports.
According to the frequency offset compensation method provided by the embodiment of the application, each user equipment only needs to perform frequency offset compensation for 1 time in each demodulation process, and compared with the N-1 frequency offset compensation in the prior art, the complexity can be reduced. Even in a multi-receiving antenna scenario, each user equipment may perform frequency offset compensation only for 1 time during each demodulation process, which can greatly reduce complexity compared with (N-1) × nano frequency offset compensation in the prior art.
The technical scheme of the embodiment of the application carries out demodulation first and then frequency offset compensation, and is more suitable for a hardware architecture of 'blind processing' and certainly suitable for other hardware architectures compared with a mode of carrying out frequency offset compensation first and then carrying out demodulation in the prior art.
An embodiment of the present application provides a frequency offset compensation apparatus, as shown in fig. 4, the frequency offset compensation apparatus 40 may include: a receiving module 401, a preprocessing module 402, a channel compensation module 403, and a frequency offset compensation module 404, wherein,
a receiving module 401, configured to receive a PUCCH signal in a PUCCH format 1 in a physical uplink control channel;
a preprocessing module 402, configured to preprocess a data receiving symbol and a pilot receiving symbol in the PUCCH signal respectively;
a channel compensation module 403, configured to perform channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot receiving symbol, and determine the data receiving symbol after channel compensation;
a frequency offset compensation module 404, configured to determine a frequency offset compensation factor according to the number of data receiving symbols in the PUCCH signal, the number of pilot receiving symbols, a PUCCH symbol interval duration, and a frequency offset estimation value corresponding to the PUCCH signal; and according to the determined frequency offset compensation factor, performing frequency offset compensation on the data receiving symbol after the channel compensation.
In some embodiments, the frequency offset compensation module 404 may include: a determination unit and a compensation unit. Wherein,
the determining unit is configured to determine a compensation parameter according to the number of data receiving symbols in the PUCCH signal, the number of pilot receiving symbols, a PUCCH symbol interval duration, and a frequency offset estimation value corresponding to the PUCCH signal; and determining the frequency offset compensation factor based on the compensation parameter.
And the compensation unit is used for carrying out frequency offset compensation on the data receiving symbol after the channel compensation according to the determined frequency offset compensation factor.
In some embodiments, when the number of received PUCCH signals is multiple and the multiple PUCCH signals correspond to the same frequency offset estimation value, the compensation unit is specifically configured to:
combining the plurality of channel-compensated data reception symbols corresponding to the plurality of PUCCH signals;
according to the determined frequency offset compensation factor, performing frequency offset compensation on the data receiving symbol after the merging processing;
or,
according to the frequency offset compensation factor corresponding to each PUCCH signal, performing frequency offset compensation on the data receiving symbol after corresponding channel compensation to obtain the data receiving symbol after frequency offset compensation corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
In some embodiments, when the number of received PUCCH signals is multiple and the multiple PUCCH signals correspond to different frequency offset estimation values, the compensation unit is specifically configured to:
according to the frequency offset compensation factor corresponding to each PUCCH signal, performing frequency offset compensation on the data receiving symbol after corresponding channel compensation to obtain the data receiving symbol after frequency offset compensation corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
In some embodiments, the determining unit is specifically configured to:
determining the compensation parameter G according to the following formula:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 G = N when =1 1 N 2 e ±j2πfΔt ，
The determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
Wherein N1 is the number of data receiving symbols in the PUCCH signal, N2 is the number of pilot frequency receiving symbols in the PUCCH signal, f is a frequency offset estimation value corresponding to the PUCCH signal, Δ t is the PUCCH symbol interval duration in the PUCCH signal, e j2πfΔt·2 Is an exponential function with a natural constant e as a base, j represents a complex number, N1 and N2 are positive integers, and when N1 is not equal to N2, the difference between N1 and N2 is 1;
when the first symbol in a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol, e is adopted when determining the compensation parameter G +j2πfΔt ；
When the head symbol in a plurality of PUCCH symbols included in the PUCCH signal is a data symbol, e is adopted when the compensation parameter G is determined -j2πfΔt 。
In some embodiments, when the compensation parameter G includes a first phase F and a first amplitude a, then it is determined according to the following equation:
when e is j2πfΔt·2 Not equal to 1，
When e is j2πfΔt·2 If =1, F = e ±j2πfΔt ,A＝N 1 N 2
The determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
C＝F * sign (A) when G ≠ 0
Wherein sign (a) represents the sign of a, the sign (a) =1 when the sign is positive, and sign (a) = -1 when the sign is negative;
determining that the first phase F is e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol +j2πfΔt ；
Determining that the first phase F is e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a data symbol -j2πfΔt 。
In some embodiments, the compensation unit is specifically configured to:
carrying out normalization processing on the data receiving symbols after channel compensation;
and according to the determined frequency offset compensation factor, performing frequency offset compensation on the normalized data receiving symbol.
In some embodiments, the determining unit is specifically configured to:
the normalized compensation parameter G' is determined according to the following equation:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the pressure is not greater than 1, the pressure is lower than 1,
the determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
Wherein N1 is the number of data receiving symbols in the PUCCH signal, N2 is the number of pilot frequency receiving symbols in the PUCCH signal, f is a frequency offset estimation value corresponding to the PUCCH signal, Δ t is the PUCCH symbol interval duration in the PUCCH signal, e j2πfΔt·2 J represents a complex number, N1 and N2 are positive integers, and when N1 is not equal to N2, the difference between N1 and N2 is 1;
when the first symbol in a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol, e is adopted when the normalized compensation parameter G' is determined +j2πfΔt ；
When the first symbol in a plurality of PUCCH symbols included in the PUCCH signal is a data symbol, e is adopted when the normalized compensation parameter G' is determined -j2πfΔt 。
In some embodiments, when the normalized compensation parameter G ' includes the second phase F ' and the second amplitude a ', it is determined according to the following equation:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
the determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
C＝F′ * sign (A ') when G' ≠ 0
Sign (a ') represents the sign of a', and sign (a ') =1 when the sign is positive and sign (a') = -1 when the sign is negative;
determining the second phase F' as e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol +j2πfΔt ；
Determining the second phase F' as e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a data symbol -j2πfΔt 。
In some embodiments, the pre-processing comprises: and (4) performing de-sequence processing and de-spreading processing.
For the content that is not described in detail in the apparatus 40 provided in the embodiment of the present application, reference may be made to the method provided in the above embodiment, and the beneficial effects that can be achieved by the apparatus 40 provided in the embodiment of the present application are the same as the method provided in the above embodiment, and are not described herein again.
Based on the same inventive concept, the embodiment of the present application further provides a frequency offset compensation apparatus, as shown in fig. 5, the apparatus 50 includes: a memory 501, a transceiver 502, and a processor 503, wherein,
a memory 501 for storing a computer program;
a transceiver 502 for transceiving data under the control of the processor 503;
a processor 503 for reading the computer program stored in the memory 501 and executing the method according to any of the embodiments.
For the content that is not described in detail in the device 50 provided in the embodiment of the present application, reference may be made to the method provided in the above embodiment, and beneficial effects that can be achieved by the device 50 provided in the embodiment of the present application are the same as those achieved by the method provided in the above embodiment, and are not described again here.
It should be appreciated that in the above-described embodiments, the bus architecture in FIG. 5 may include any number of interconnected buses and bridges, with one or more processors represented by processor 503 and various circuits of memory represented by memory 501 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The transceiver 502 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium including wireless channels, wired channels, fiber optic cables, and the like. The processor 503 is responsible for managing the bus architecture and general processing, and the memory 501 may store data used by the processor 503 in performing operations.
The processor 503 may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), or a Complex Programmable Logic Device (CPLD), and may also have a multi-core architecture.
The embodiment of the present application provides a computer readable storage medium, on which a computer program is stored, and when the computer program runs on a computer, the computer is enabled to execute the corresponding content in the foregoing method embodiment.
The embodiment of the present application further provides a computer program product, which, when running on a network device, causes the network device to execute the corresponding content in the foregoing method embodiments.
Compared with the prior art, the embodiment of the application provides a frequency offset compensation method, each receiving symbol in a PUCCH signal is preprocessed, the preprocessed data receiving symbols are subjected to channel compensation based on the preprocessed pilot frequency receiving symbols to obtain the data receiving symbols after the channel compensation, and finally the frequency offset compensation is carried out on the data receiving symbols after the channel compensation.
It should be noted that the division of the unit in the embodiment of the present application is schematic, and is only a logic function division, and there may be another division manner in actual implementation. In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented as a software functional unit and sold or used as a stand-alone product, may be stored in a processor readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
As will be appreciated by one skilled in the art, the embodiments disclosed herein may be provided as a method, system, or computer program product, among other things. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (16)
1. A method of frequency offset compensation, the method comprising:
receiving a Physical Uplink Control Channel (PUCCH) signal;
respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal;
performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation;
determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
2. The method of claim 1, wherein the determining a frequency offset compensation factor according to the number of data received symbols in the PUCCH signal, the number of pilot received symbols, a PUCCH symbol interval duration, and a frequency offset estimation value corresponding to the PUCCH signal comprises:
determining compensation parameters according to the number of data receiving symbols, the number of pilot frequency receiving symbols, PUCCH symbol interval duration and frequency offset estimation values corresponding to the PUCCH signals;
determining the frequency offset compensation factor based on the compensation parameter.
3. The method of claim 2, wherein when there are a plurality of PUCCH signals received and the plurality of PUCCH signals correspond to the same frequency offset estimation value, performing frequency offset compensation on the channel-compensated data received symbol according to the determined frequency offset compensation factor, including:
combining the plurality of channel-compensated data reception symbols corresponding to the plurality of PUCCH signals;
according to the determined frequency offset compensation factor, performing frequency offset compensation on the data receiving symbol after the merging processing;
or,
according to the frequency offset compensation factor corresponding to each PUCCH signal, performing frequency offset compensation on the data receiving symbol after corresponding channel compensation to obtain the data receiving symbol after frequency offset compensation corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
4. The method of claim 2, wherein when there are a plurality of PUCCH signals received and the plurality of PUCCH signals correspond to different frequency offset estimation values, performing frequency offset compensation on the channel-compensated data received symbol according to the determined frequency offset compensation factor, including:
performing frequency offset compensation on the data receiving symbols after corresponding channel compensation according to the frequency offset compensation factor corresponding to each PUCCH signal to obtain the frequency offset compensated data receiving symbols corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
5. The method according to any of claims 2-4, wherein the determining a compensation parameter according to the number of data received symbols in the PUCCH signal, the number of pilot received symbols, the PUCCH symbol interval duration, and the frequency offset estimation value corresponding to the PUCCH signal comprises:
determining the compensation parameter G according to the following formula:
when e is j2πfΔt·2 When the number is not equal to 1,
when e is j2πfΔt·2 G = N when =1 1 N 2 e ±j2πfΔt ，
The determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
Wherein N1 is the number of data receiving symbols in the PUCCH signal, N2 is the number of pilot frequency receiving symbols in the PUCCH signal, f is a frequency offset estimation value corresponding to the PUCCH signal, delta t is the PUCCH symbol interval duration in the PUCCH signal, e j2πfΔt·2 J represents a complex number, N1 and N2 are positive integers, and when N1 is not equal to N2, the difference between N1 and N2 is 1;
when the first symbol in a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol, e is adopted when determining the compensation parameter G +j2πfΔt ；
When the head symbol in a plurality of PUCCH symbols included in the PUCCH signal is a data symbol, e is adopted when the compensation parameter G is determined -j2πfΔt 。
6. The method of claim 5, wherein when the compensation parameter G includes a first phase F and a first amplitude A, then determining according to the following equation:
when e is j2πfΔt·2 When the number is not equal to 1,
when e is j2πfΔt·2 =1, F = e ±j2πfΔt ,A＝N 1 N 2
The determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
C＝F * sign (A) when G ≠ 0
Wherein sign (A) represents the sign of A, the sign (A) =1 when the sign is positive, and sign (A) = -1 when the sign is negative;
determining that the first phase F is e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol +j2πfΔt ；
Determining the first phase when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a data symbolThe bit F is e -j2πfΔt 。
7. The method according to any one of claims 2-4, wherein said performing frequency offset compensation on the channel-compensated data reception symbols according to the determined frequency offset compensation factor comprises:
normalizing the data receiving symbols after channel compensation;
and according to the determined frequency offset compensation factor, performing frequency offset compensation on the normalized data receiving symbol.
8. The method of claim 7, wherein determining a compensation parameter according to the number of data received symbols in the PUCCH signal, the number of pilot received symbols, a PUCCH symbol interval duration, and a frequency offset estimation value corresponding to the PUCCH signal comprises:
the normalized compensation parameter G' is determined according to the following equation:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
the determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
Wherein N1 is the number of data receiving symbols in the PUCCH signal, N2 is the number of pilot frequency receiving symbols in the PUCCH signal, f is a frequency offset estimation value corresponding to the PUCCH signal, and deltat is the interval duration of PUCCH symbols in the PUCCH signal, e j2πfΔt·2 J represents a complex number, N1 and N2 are positive integers, and when N1 is not equal to N2, the difference between N1 and N2 is 1;
when the first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol, e is adopted when the normalized compensation parameter G' is determined +j2πfΔt ；
When the first symbol in a plurality of PUCCH symbols included in the PUCCH signal is a data symbol, e is adopted when the normalized compensation parameter G' is determined -j2πfΔt 。
9. The method of claim 8, wherein when the normalized compensation parameter G ' includes the second phase F ' and the second amplitude a ', it is determined according to the following equation:
when e is j2πfΔt·2 When the number is not equal to 1, the content is determined,
when e is j2πfΔt·2 When the ratio is not less than 1,
the determining the frequency offset compensation factor based on the compensation parameter includes:
determining the frequency offset compensation factor C according to the following formula:
C＝F′ * sign (A') is G ′ ≠0
Wherein sign (a ') represents that the sign of a' is taken, the sign (a ') =1 when the sign is positive, and sign (a') = -1 when the sign is negative;
determining the second phase F' as e when a first symbol of a plurality of PUCCH symbols included in the PUCCH signal is a pilot symbol +j2πfΔt ；
When the PUCCH signal comprises a plurality of PUCCH symbolsWhen the first symbol in the number is a data symbol, determining the second phase F' as e -j2πfΔt 。
10. The method of claim 1, wherein the pre-processing comprises: and (4) performing de-sequence processing and de-spreading processing.
11. A frequency offset compensation apparatus, comprising:
a memory for storing a computer program;
a transceiver for receiving a physical uplink control channel, PUCCH, signal under control of the processor;
a processor for reading the computer program in the memory and performing the following:
respectively preprocessing a data receiving symbol and a pilot frequency receiving symbol in the PUCCH signal;
performing channel compensation on the preprocessed data receiving symbol according to the preprocessed pilot frequency receiving symbol, and determining the data receiving symbol after the channel compensation;
determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal in the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
12. The device of claim 11, wherein the processor is specifically configured to:
determining compensation parameters according to the number of data receiving symbols, the number of pilot frequency receiving symbols, PUCCH symbol interval duration and frequency offset estimation values corresponding to the PUCCH signals; determining the frequency offset compensation factor based on the compensation parameter.
13. The apparatus of claim 12, wherein when there are multiple PUCCH signals received and the multiple PUCCH signals correspond to the same frequency offset estimation value, the processor is specifically configured to:
combining the plurality of channel-compensated data reception symbols corresponding to the plurality of PUCCH signals;
according to the determined frequency offset compensation factor, carrying out frequency offset compensation on the data receiving symbol after the merging processing;
or,
according to the frequency offset compensation factor corresponding to each PUCCH signal, performing frequency offset compensation on the data receiving symbol after corresponding channel compensation to obtain the data receiving symbol after frequency offset compensation corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
14. The apparatus of claim 12, wherein when there are multiple PUCCH signals received and the multiple PUCCH signals correspond to different frequency offset estimates, the processor is specifically configured to:
according to the frequency offset compensation factor corresponding to each PUCCH signal, performing frequency offset compensation on the data receiving symbol after corresponding channel compensation to obtain the data receiving symbol after frequency offset compensation corresponding to the plurality of PUCCH signals respectively;
and combining the data receiving symbols which correspond to the PUCCH signals and are subjected to the frequency offset compensation.
15. A frequency offset compensation apparatus, comprising:
a receiving module, configured to receive a PUCCH signal in a PUCCH format 1 using a physical uplink control channel;
a preprocessing module, configured to perform preprocessing on a data reception symbol and a pilot reception symbol in the PUCCH signal respectively;
the channel compensation module is used for carrying out channel compensation on the preprocessed data receiving symbols according to the preprocessed pilot frequency receiving symbols and determining the data receiving symbols after the channel compensation;
the frequency offset compensation module is used for determining a frequency offset compensation factor according to the number of data receiving symbols, the number of pilot frequency receiving symbols, the PUCCH symbol interval duration and a frequency offset estimation value corresponding to the PUCCH signal;
and performing frequency offset compensation on the data receiving symbol after the channel compensation according to the frequency offset compensation factor.
16. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program for causing a processor to execute the frequency offset compensation method of any one of claims 1 to 10.
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| CN103023832A (en) * | 2011-09-23 | 2013-04-03 | 京信通信系统（中国）有限公司 | Method and device for carrying out frequency offset estimation and compensation on receiver |
| CN103701490A (en) * | 2014-01-15 | 2014-04-02 | 西安电子科技大学 | Hybrid spread spectrum communication system based on low density parity code (LDPC) encoding and method thereof |
| WO2015139590A1 (en) * | 2014-03-21 | 2015-09-24 | 电信科学技术研究院 | Frequency offset estimation and compensation method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011147205A1 (en) * | 2010-05-24 | 2011-12-01 | 中兴通讯股份有限公司 | Frequency offset compensation and equalization method and device in an orthogonal frequency division multiplexing system |
| CN102377716A (en) * | 2010-08-12 | 2012-03-14 | 中兴通讯股份有限公司 | Pre-compensation method and device for descending frequency offset of orthogonal frequency division multiple access (OFDMA) communication system |
| CN102468911A (en) * | 2010-11-11 | 2012-05-23 | 中兴通讯股份有限公司 | Decoding method of PUCCH and apparatus thereof |
| CN103023832A (en) * | 2011-09-23 | 2013-04-03 | 京信通信系统（中国）有限公司 | Method and device for carrying out frequency offset estimation and compensation on receiver |
| CN103701490A (en) * | 2014-01-15 | 2014-04-02 | 西安电子科技大学 | Hybrid spread spectrum communication system based on low density parity code (LDPC) encoding and method thereof |
| WO2015139590A1 (en) * | 2014-03-21 | 2015-09-24 | 电信科学技术研究院 | Frequency offset estimation and compensation method and device |
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