CN106685869B - Frequency offset compensation method and related device - Google Patents
Frequency offset compensation method and related device Download PDFInfo
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- CN106685869B CN106685869B CN201710044502.8A CN201710044502A CN106685869B CN 106685869 B CN106685869 B CN 106685869B CN 201710044502 A CN201710044502 A CN 201710044502A CN 106685869 B CN106685869 B CN 106685869B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0014—Carrier regulation
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Abstract
The embodiment of the invention relates to the field of communication, in particular to a frequency offset compensation method and a related device, which are used for solving the problem of low precision of a frequency offset estimation and compensation method in the prior art. In the embodiment of the invention, a base station receives a sounding reference signal sent by a terminal according to a set period, then calculates a frequency offset estimation value of the sounding reference signal according to the sounding reference signal, and finally performs first frequency offset compensation on a signal transmitted on a PUCCH according to the frequency offset estimation value of the sounding reference signal. Because the frequency offset estimation value calculated according to the detection reference signal has a large range, the frequency offset estimation value calculated by the base station according to the detection reference signal can effectively compensate large Doppler frequency offset brought by the terminal in a high-speed motion environment, and the precision of frequency offset estimation and compensation is improved.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a frequency offset compensation method and a related apparatus.
Background
With the continuous establishment, opening and use of high-speed railways and highways, a new generation of mobile communication system needs to transmit high-speed information with users moving at high speed. High-speed information transmission in a high-speed moving state will face more difficulties than communication in a stationary state or a low-speed state. In a high-speed environment, since the mobile terminal has a high moving speed, a large doppler shift is introduced, and the large doppler shift causes a large frequency shift of a received signal and a rapid change of a scattering component, which leads to a serious degradation of system performance. Therefore, overcoming the effects of doppler is key to improving system performance. In the prior art, a time domain pre-compensation method is adopted to perform coarse frequency offset estimation and compensation, and then fine frequency offset estimation and compensation are performed. Because the time domain pre-compensation method is not very accurate in estimating the Signal-to-noise Ratio (SINR), the pre-compensation value corresponding to the maximum SINR estimation value is a sub-optimal pre-compensation value, and thus the compensation accuracy for the frequency offset is low.
Disclosure of Invention
The embodiment of the invention provides a frequency offset compensation method and a related device, which are used for solving the problem of low precision of a frequency offset estimation and compensation method in the prior art.
The embodiment of the invention provides a frequency offset compensation method, which comprises the following steps:
the base station receives the sounding reference signal according to a set period;
the base station calculates a frequency offset estimation value of the sounding reference signal according to the sounding reference signal;
and the base station performs first frequency offset compensation on a signal transmitted on a Physical Uplink Control CHannel (PUCCH for short) according to the frequency offset estimation value of the sounding reference signal.
Optionally, the calculating, by the base station, a frequency offset estimation value of the sounding reference signal according to the sounding reference signal includes:
the base station differentiates two continuously received sounding reference signals to determine a Doppler frequency offset estimation value of the sounding reference signals;
the base station performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, and the method comprises the following steps:
the base station receives a signal transmitted on a PUCCH, wherein the signal transmitted on the PUCCH is an uplink signal received after two sounding reference signals continuously received by the base station;
and the base station performs first frequency offset compensation on the signal transmitted on the PUCCH by using the Doppler frequency offset estimation value of the sounding reference signal.
Optionally, after performing first frequency offset compensation on the signal transmitted on the PUCCH by the base station according to the frequency offset value of the sounding reference signal, the method further includes:
the base station measures the channel quality of the PUCCH according to the sounding reference signal;
and when the channel quality of the PUCCH is determined not to meet the preset threshold, calculating a frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, and performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal.
Optionally, the base station performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, where the first frequency offset compensation conforms to the following formula (1):
wherein RXPUCCH_1For signals transmitted on said PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on the PUCCH, foffset_1The estimated value of the frequency deviation of the detection reference signal is n, and n is a time sequence index number;
the base station performs second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal, and the second frequency offset compensation accords with the following formula (2):
wherein RXPUCCH_2For signals transmitted on said PUCCH after second frequency offset compensation, RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, foffset_2And n is a time sequence index number, and is the frequency offset estimation value of the demodulation reference signal.
The embodiment of the invention provides a frequency offset compensation method, which comprises the following steps:
and the terminal sends the sounding reference signal according to a set period.
Correspondingly, an embodiment of the present invention provides a frequency offset compensation apparatus, applied to a base station, including:
the receiving module is used for receiving the sounding reference signal according to a set period;
the processing module is used for calculating a frequency offset estimation value of the sounding reference signal according to the sounding reference signal;
and the compensation module is used for performing first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal.
Optionally, the processing module is specifically configured to:
carrying out difference on two continuously received sounding reference signals to determine a Doppler frequency offset estimation value of the sounding reference signals;
the compensation module is specifically configured to:
receiving a signal transmitted on a PUCCH, wherein the signal transmitted on the PUCCH is an uplink signal received after two sounding reference signals continuously received by the base station;
and performing first frequency offset compensation on the signal transmitted on the PUCCH by using the Doppler frequency offset estimation value of the sounding reference signal.
Optionally, the compensation module is further configured to:
performing channel quality measurement of the PUCCH according to the sounding reference signal;
and when the channel quality of the PUCCH is determined not to meet the preset threshold, calculating a frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, and performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal.
Optionally, the compensation module is specifically configured to:
performing first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, wherein the first frequency offset compensation conforms to the following formula (1):
wherein RXPUCCH_1For signals transmitted on said PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on the PUCCH, foffset_1The estimated value of the frequency deviation of the detection reference signal is n, and n is a time sequence index number;
performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal, wherein the second frequency offset compensation conforms to the following formula (2):
wherein RXPUCCH_2For signals transmitted on said PUCCH after second frequency offset compensation, RXPUCCH_1For the first timeSignal transmitted on the PUCCH after frequency offset compensation, foffset_2And n is a time sequence index number, and is the frequency offset estimation value of the demodulation reference signal.
The embodiment of the invention provides a frequency offset compensation device, which is applied to a terminal and comprises the following components:
and the sending module is used for sending the sounding reference signal according to the set period.
The embodiment of the invention provides a frequency offset compensation method and a related device. And the base station receives the sounding reference signal sent by the terminal according to the set period. And the base station calculates the frequency offset estimation value of the detection reference signal according to the detection reference signal, and then performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the detection reference signal. Because the sounding reference signal and the signal transmitted on the PUCCH are transmitted in one wireless frame, the frequency offset of the sounding reference signal is close to the frequency offset of the signal transmitted on the PUCCH, so that the frequency offset estimation value calculated by the base station according to the sounding reference signal sent by the terminal can effectively compensate the frequency offset of the signal transmitted on the PUCCH in the same wireless frame. Because the frequency offset estimation range based on the detection reference signal is large, the frequency offset estimation value calculated by the base station according to the detection reference signal can effectively compensate the large Doppler frequency offset brought by the terminal in a high-speed motion environment, and the precision of frequency offset estimation and compensation is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a frequency offset compensation method according to an embodiment of the present invention;
fig. 2 is a frame structure diagram of an LTE communication system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a slot in a PUCCH format2 according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another frequency offset compensation method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a frequency offset compensation apparatus according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another frequency offset compensation apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be understood that the technical solutions of the embodiments of the present invention can be applied to various communication systems, for example: a Global System for Mobile communications (GSM) System, a Code Division Multiple Access (CDMA) System, a Wideband Code Division Multiple Access (WCDMA) General Packet Radio Service (GPRS) System, a Long Term Evolution (Long Term Evolution) System, a Frequency Division Duplex (FDD) System, a Time Division Duplex (TDD) System, a Universal Mobile Telecommunications System (UMTS), a Worldwide Interoperability for Microwave Access (WiMAX) Communication System, and a future 5G Communication System.
Fig. 1 schematically shows a flow of a frequency offset compensation method provided by an embodiment of the present invention, and as shown in fig. 1, the specific steps of the flow include:
and step S101, the terminal sends the sounding reference signal according to a set period.
Step S102, the base station receives the sounding reference signal according to a set period.
Step S103, the base station calculates the frequency offset estimation value of the detection reference signal according to the detection reference signal;
and step S104, the base station performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal.
In the embodiment of the present invention, the Sounding Reference Signal (SRS) is collectively referred to as Sounding Reference Signal. The SRS is used for sounding channel quality, power control, and the like. In order to better understand the process of sending the sounding reference signal in step S101 according to the embodiment of the present invention, first, a frame structure of an LTE communication system closely related to the embodiment of the present invention is introduced, and fig. 2 exemplarily illustrates a frame structure of a TDD-LTE communication system provided by the embodiment of the present invention, as shown in fig. 2. Each wireless frame of the TDD-LTE communication system is 10ms in length, each wireless frame is divided into two half frames of 5ms, each half frame comprises 5 subframes of 1ms, each subframe comprises two time slots, the length of each time slot is 0.5ms, and the 1 st frame, namely the subframe #0, is a fixed downlink subframe; frame 2 and frame 7 are special subframes, and include DwPTS (Downlink Pilot Time Slot), GP (guard interval), UpPTS (Uplink Pilot Time Slot); subframe #2, which is the 3 rd frame, is a fixed uplink subframe, and similarly, subframes #3, #5, and #8 are fixed downlink subframes, and subframes #4, #7, and #9 are fixed uplink subframes. The TDD-LTE communication system is suitable for uplink and downlink symmetric and asymmetric service modes by flexibly configuring the number of uplink and downlink subframes, and the uplink and downlink subframes are separated by a switching point. In specific implementation, the sounding reference signal is transmitted by a symbol occupied by an uplink pilot time slot UpPTS, or by the last symbol in a preset uplink subframe. The sounding reference signal may be transmitted by setting all symbols occupied by the UpPTS, for example, the sounding reference signal may be transmitted by the symbols occupied by the UpPTS in the 2 nd frame and the 7 th frame. The sounding reference signal may also set a symbol occupied by the UpPTS and a last symbol in the uplink subframe for transmission, such as a symbol occupied by the UpPTS in frame 2 and a last symbol in frame 3, i.e., subframe # 2. The sounding reference signal may also be configured to be transmitted by the last symbol of a preset uplink subframe, such as subframe #2, subframe #4, subframe #7, and the last symbol of subframe #9One symbol is transmitted. The period of sending the detection signal by the terminal can be set according to specific situations. The sounding reference signal is transmitted before being configured by the base station with the transmission period and related parameters, such as configuration index ISRSConfiguring a sounding reference signal transmission period T as 0SRSConfiguring corresponding subframe frequency offset T in 2msoffset0,1, etc.
In step S102 and step S103, after receiving the sounding reference signal, the base station calculates a frequency offset estimation value of the sounding reference signal according to the sounding reference signal. In a specific implementation, the base station may calculate the doppler frequency offset of the sounding reference signal according to the sounding reference signal, and the calculation process is to determine the doppler frequency offset estimation value of the sounding reference signal by performing a difference between two continuously received sounding reference signals. In addition, the base station can calculate the channel quality according to the received sounding reference signal, and the channel quality can be the signal-to-noise ratio or the useful signal power.
In step S104, when the terminal has a service requirement, the terminal may transmit a signal to the base station through a Physical Uplink Control Channel (PUCCH). The PUCCH signal is transmitted by an uplink subframe in one radio frame, such as subframe #2, subframe #4, subframe #7, subframe #9 in fig. 2. The Format of the signal transmitted on the PUCCH can be PUCCH Format1/1a/1b, and can also be PUCCH Format2/2a/2 b. The Format PUCCH Format2/2a/2b is shown in fig. 3, where symbols 2 and 6 are pilot symbols, and symbols 1, 3, 4, 5, and 7 are data symbols, which have fewer pilot symbols and are discontinuous. Because the pilot frequency symbol sends fixed information which can be directly used for frequency offset estimation, and the information sent by the data symbol is different, the frequency offset estimation can not be carried out by the data symbol. After receiving the signal transmitted on the PUCCH, the base station may calculate a doppler frequency offset estimation value of the sounding reference signal according to two sounding reference signals continuously received before receiving the signal transmitted on the PUCCH, and perform a first frequency offset compensation on the signal transmitted on the PUCCH according to the calculated frequency offset estimation value of the sounding reference signal, where the first frequency offset compensation conforms to the following formula (1):
wherein RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on PUCCH, foffset_1For the frequency offset estimation value of the sounding reference signal, n is a time sequence index number. Because the sounding reference signal and the signal transmitted on the PUCCH are sent in a wireless frame, the frequency offset of the sounding reference signal is close to the frequency offset of the signal transmitted on the PUCCH, so that the frequency offset of the signal transmitted on the PUCCH can be compensated by calculating the frequency offset estimation value of the sounding reference signal, and in addition, a large Doppler frequency offset range can be calculated according to the sounding reference signal, thereby effectively compensating the large Doppler frequency offset brought by high-speed motion.
After performing first frequency offset compensation on a signal transmitted on a PUCCH (physical uplink control channel) according to the frequency offset value of the sounding reference signal, the base station performs channel quality measurement of the PUCCH according to the sounding reference signal, and judges whether the channel quality of the PUCCH meets a preset threshold, wherein the channel quality of the PUCCH can be useful signal power or signal-to-noise ratio. In specific implementation, the signal-to-noise ratio of the channel can be calculated according to the sounding reference signal, whether the signal-to-noise ratio is greater than a preset threshold is judged, if the signal-to-noise ratio is greater than the preset threshold, the channel quality is better, and the frequency offset estimation is more accurate, then the base station does not need to perform second frequency offset compensation on the signal transmitted on the PUCCH, and directly demodulates the signal transmitted on the PUCCH after the first frequency offset compensation, so as to obtain the uplink control information. If the signal-to-noise ratio is not greater than the preset threshold, which indicates that the channel quality is poor, the base station needs to perform second frequency offset compensation on the signal transmitted on the PUCCH, and then demodulates the signal transmitted on the PUCCH after the second frequency offset compensation to obtain the uplink control information. Specifically, the frequency offset estimation value of the demodulation reference signal is calculated according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, the demodulation reference signal is transmitted by the symbol occupied by the pilot in fig. 3, and the specific process of calculating the frequency offset estimation value of the demodulation reference signal is to perform conjugate multiplication on the signals transmitted on two pilot symbols in one slot to obtain a phase difference, and a doppler frequency offset estimation value is calculated according to the phase difference. Since only one frequency offset estimate is obtained for one time slot, the frequency offset estimates for the two time slots can be averaged. And then carrying out second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal. The second frequency offset compensation conforms to the following equation (2):
wherein RXPUCCH_2For signals transmitted on the PUCCH after second frequency offset compensation, RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, foffset_2And n is a time sequence index number for the frequency offset estimation value of the demodulation reference signal.
Because the channel quality is estimated according to the sounding reference signal and the accuracy of frequency offset estimation is judged by combining the channel quality, the precision of frequency offset estimation and compensation is improved, and the performance of PUCCH channel for resisting frequency offset detection is improved.
In order to better explain the embodiment of the present invention, the following describes a flow of a frequency offset compensation method provided by the embodiment of the present invention through a specific implementation scenario.
As shown in fig. 4, the method comprises the steps of:
step S401, the terminal sends a sounding reference signal to the base station according to a set period.
In step S402, the base station receives the sounding reference signal according to a set period.
Step S403, the base station calculates a frequency offset estimation value of the sounding reference signal according to the sounding reference signal.
Step S404, the base station performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal.
Step S405, the base station measures the channel quality of the PUCCH according to the sounding reference signal.
In step S406, the base station determines whether the channel quality meets a predetermined threshold, if yes, step S407 is executed, otherwise step S408 is executed.
Step S407, the base station demodulates the signal transmitted on the PUCCH after the first frequency offset compensation.
Step S408, the base station calculates the frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal.
Step S409, the base station performs second frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the demodulation reference signal.
Step S410, the base station demodulates the signal transmitted on the PUCCH after the second frequency offset compensation.
It can be seen from the foregoing that, the embodiments of the present invention provide a frequency offset compensation method and a related apparatus, where a terminal sends a sounding reference signal according to a set period. And the base station receives the sounding reference signal sent by the terminal according to the set period. And the base station calculates the frequency offset estimation value of the detection reference signal according to the detection reference signal, and then performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the detection reference signal. Because the sounding reference signal and the signal transmitted on the PUCCH are transmitted in one wireless frame, the frequency offset of the sounding reference signal is close to the frequency offset of the signal transmitted on the PUCCH, so that the frequency offset estimation value calculated by the base station according to the sounding reference signal sent by the terminal can effectively compensate the frequency offset of the signal transmitted on the PUCCH in the same wireless frame. Because the frequency offset estimation range based on the detection reference signal is large, the frequency offset estimation value calculated by the base station according to the detection reference signal can effectively compensate the large Doppler frequency offset brought by the terminal in a high-speed motion environment, and the precision of frequency offset estimation and compensation is improved.
Based on the same conception, fig. 5 exemplarily shows a structure of a frequency offset compensation apparatus provided by an embodiment of the present invention, which is applied to the base station 500 and can perform a flow of a frequency offset compensation method.
As shown in fig. 5, the apparatus includes:
the receiving module 501 is configured to receive a sounding reference signal according to a set period.
A processing module 502, configured to calculate a frequency offset estimation value of the sounding reference signal according to the sounding reference signal.
A compensation module 503, configured to perform first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal.
Optionally, the processing module 502 is specifically configured to:
carrying out difference on two continuously received sounding reference signals to determine a Doppler frequency offset estimation value of the sounding reference signals;
the compensation module 503 is specifically configured to:
receiving a signal transmitted on a PUCCH, wherein the signal transmitted on the PUCCH is an uplink signal received after two sounding reference signals continuously received by the base station;
and performing first frequency offset compensation on the signal transmitted on the PUCCH by using the Doppler frequency offset estimation value of the sounding reference signal.
Optionally, the compensation module 503 is further configured to:
performing channel quality measurement of the PUCCH according to the sounding reference signal;
and when the channel quality of the PUCCH is determined not to meet the preset threshold, calculating a frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, and performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal.
Optionally, the compensation module 503 is specifically configured to:
performing first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, wherein the first frequency offset compensation conforms to the following formula (1):
wherein RXPUCCH_1For signals transmitted on said PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on the PUCCH, foffset_1The estimated value of the frequency deviation of the detection reference signal is n, and n is a time sequence index number;
performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal, wherein the second frequency offset compensation conforms to the following formula (2):
wherein RXPUCCH_2For signals transmitted on said PUCCH after second frequency offset compensation, RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, foffset_2And n is a time sequence index number, and is the frequency offset estimation value of the demodulation reference signal.
Based on the same concept, another frequency offset compensation apparatus provided in the embodiment of the present invention is applied to a terminal 600, as shown in fig. 6, and the apparatus includes:
a sending module 601, configured to send the sounding reference signal according to a set period.
It should be apparent to those skilled in the art that embodiments of the present invention may be provided as a method, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. 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 program instructions. These computer program 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 computer program instructions may also be stored in a computer-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 computer-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 computer program 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.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A method of frequency offset compensation, comprising:
the base station receives the sounding reference signal according to a set period;
the base station calculates a frequency offset estimation value of the sounding reference signal according to the sounding reference signal;
the base station performs first frequency offset compensation on a signal transmitted on a PUCCH according to the frequency offset estimation value of the sounding reference signal;
the base station measures the channel quality of the PUCCH according to the sounding reference signal;
and when the channel quality of the PUCCH is determined not to meet the preset threshold, calculating a frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, and performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal.
2. The method of claim 1, wherein the base station calculating the frequency offset estimate for the sounding reference signal based on the sounding reference signal comprises:
the base station differentiates two continuously received sounding reference signals to determine a Doppler frequency offset estimation value of the sounding reference signals;
the base station performs first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, and the method comprises the following steps:
the base station receives a signal transmitted on a PUCCH, wherein the signal transmitted on the PUCCH is an uplink signal received after two sounding reference signals continuously received by the base station;
and the base station performs first frequency offset compensation on the signal transmitted on the PUCCH by using the Doppler frequency offset estimation value of the sounding reference signal.
3. The method of claim 1, wherein the base station performs the first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, according to the following formula (1):
wherein RXPUCCH_1For signals transmitted on said PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on the PUCCH, foffset_1Is that it isDetecting a frequency offset estimation value of a reference signal, wherein n is a time sequence index number;
the base station performs second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal, and the second frequency offset compensation accords with the following formula (2):
wherein RXPUCCH_2For signals transmitted on said PUCCH after second frequency offset compensation, RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, foffset_2And n is a time sequence index number, and is the frequency offset estimation value of the demodulation reference signal.
4. A method of frequency offset compensation, comprising:
the terminal sends a sounding reference signal according to a set period; the sounding reference signal is used for frequency offset compensation of a base station according to the method of any one of claims 1 to 3.
5. A frequency offset compensation apparatus applied to a base station, comprising:
the receiving module is used for receiving the sounding reference signal according to a set period;
the processing module is used for calculating a frequency offset estimation value of the sounding reference signal according to the sounding reference signal;
the compensation module is used for carrying out first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the detection reference signal;
performing channel quality measurement of the PUCCH according to the sounding reference signal;
and when the channel quality of the PUCCH is determined not to meet the preset threshold, calculating a frequency offset estimation value of the demodulation reference signal according to the demodulation reference signal in the signal transmitted on the PUCCH after the first frequency offset compensation, and performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal.
6. The apparatus of claim 5, wherein the processing module is specifically configured to:
carrying out difference on two continuously received sounding reference signals to determine a Doppler frequency offset estimation value of the sounding reference signals;
the compensation module is specifically configured to:
receiving a signal transmitted on a PUCCH, wherein the signal transmitted on the PUCCH is an uplink signal received after two sounding reference signals continuously received by the base station;
and performing first frequency offset compensation on the signal transmitted on the PUCCH by using the Doppler frequency offset estimation value of the sounding reference signal.
7. The apparatus of claim 5, wherein the compensation module is specifically configured to:
performing first frequency offset compensation on the signal transmitted on the PUCCH according to the frequency offset estimation value of the sounding reference signal, wherein the first frequency offset compensation conforms to the following formula (1):
wherein RXPUCCH_1For signals transmitted on said PUCCH after first frequency offset compensation, RXPUCCHFor signals transmitted on the PUCCH, foffset_1The estimated value of the frequency deviation of the detection reference signal is n, and n is a time sequence index number;
performing second frequency offset compensation on the signal transmitted on the PUCCH after the first frequency offset compensation according to the frequency offset estimation value of the demodulation reference signal, wherein the second frequency offset compensation conforms to the following formula (2):
wherein RXPUCCH_2For the second frequency offset compensationSignals transmitted on the PUCCH, RXPUCCH_1For signals transmitted on the PUCCH after first frequency offset compensation, foffset_2And n is a time sequence index number, and is the frequency offset estimation value of the demodulation reference signal.
8. A frequency offset compensation device applied to a terminal is characterized by comprising:
the sending module is used for sending the sounding reference signal according to a set period; the sounding reference signal is used for frequency offset compensation of the base station of any of claims 5 to 7.
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