CN114697169B

CN114697169B - Carrier phase measurement method and device

Info

Publication number: CN114697169B
Application number: CN202011561065.5A
Authority: CN
Inventors: 李刚; 任斌; 方荣一; 张振宇; 达人; 孙韶辉
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2023-11-03
Anticipated expiration: 2040-12-25
Also published as: CN114697169A; WO2022134621A1

Abstract

The application discloses a carrier phase measurement method and a carrier phase measurement device, which are used for aiming at the relatively bad wireless channel condition under a complex scene, solving the problem of deteriorated frequency domain loop phase tracking performance in the existing double-loop OFDM phase tracking scheme, improving the 5G NR carrier phase measurement performance, effectively improving the phase tracking performance of a frequency domain loop and improving the positioning measurement precision. The application provides a carrier phase measuring method, which comprises the following steps: performing phase jump detection on effective subcarriers in a current Orthogonal Frequency Division Multiplexing (OFDM) symbol of an input baseband signal; determining a frequency domain dynamic feedback output value of the effective sub-carrier according to the phase jump detection result; and carrying out phase correction on the input baseband signal based on the frequency domain dynamic feedback output value.

Description

Carrier phase measurement method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a carrier phase measurement method and apparatus.

Background

Currently, the third generation partnership project (3rd Generation Partnership Project,3GPP) has introduced the following New Radio (NR) signal-based Radio access technology (Radio Access Technology, RAT) positioning method in release 16 (Rel-16):

NR enhanced cell ID positioning method (E-CID);

NR downlink time difference of arrival positioning (DL-TDOA);

NR uplink time difference of arrival positioning (UL-TDOA);

NR Multi-cell round trip time positioning (Multi-RTT);

NR downlink off angle positioning (DL-AoD);

NR uplink angular-of-arrival positioning (UL-AoA).

Through the Rel-16 positioning method, 90% of users can achieve sub-meter level horizontal positioning accuracy.

The carrier phase measuring method can further improve the positioning accuracy and achieve the centimeter-level positioning accuracy. The dual loop phase tracking scheme is an efficient orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplex, OFDM) carrier phase measurement method. The phase change of the input baseband signal can be tracked through the double-loop structure of the time domain loop and the frequency domain loop, and the carrier phase is obtained. However, under the condition of a relatively bad wireless channel, the tracking performance of a frequency domain loop of the dual-loop phase tracking scheme is reduced, and the positioning measurement precision is not high.

Disclosure of Invention

The embodiment of the application provides a carrier phase measurement method and a carrier phase measurement device, which are used for aiming at the relatively bad wireless channel condition in a complex scene, solving the problem of deteriorated frequency domain loop phase tracking performance in the existing double-loop OFDM phase tracking scheme, improving the 5G NR carrier phase measurement performance, effectively improving the phase tracking performance of the frequency domain loop and improving the positioning measurement precision.

The carrier phase measuring method provided by the embodiment of the application comprises the following steps:

performing phase jump detection on effective subcarriers in a current Orthogonal Frequency Division Multiplexing (OFDM) symbol of an input baseband signal;

determining a frequency domain dynamic feedback output value of the effective sub-carrier according to the phase jump detection result;

and carrying out phase correction on the input baseband signal based on the frequency domain dynamic feedback output value.

According to the method, the phase jump detection is carried out on effective subcarriers in the current Orthogonal Frequency Division Multiplexing (OFDM) symbol of the input baseband signal; determining a frequency domain dynamic feedback output value of the effective sub-carrier according to the phase jump detection result; based on the frequency domain dynamic feedback output value, the phase correction is carried out on the input baseband signal, which can be the phase correction of the frequency domain and/or the time domain, thereby realizing the real-time correction of the subcarrier level, effectively reducing the influence of the phase jump or continuous jump of the input baseband signal, improving the phase tracking performance of a frequency domain loop, further improving the final tracking precision of the time domain loop output, having smaller tracking phase burr, successfully inhibiting the phase cycle jump and improving the positioning measurement precision. Namely, the embodiment of the application is oriented to the relatively bad wireless channel condition in a complex scene, solves the problem of deteriorated frequency domain loop phase tracking performance in the existing double-loop OFDM phase tracking scheme, improves the 5G NR carrier phase measurement performance, and effectively improves the phase tracking performance of the frequency domain loop.

Optionally, the effective subcarriers include subcarriers corresponding to frequency domains of positioning reference signals in the OFDM symbol.

Optionally, the phase correction includes:

performing time domain phase correction on the current OFDM symbol of the input baseband signal by adopting a time domain phase correction value, and then performing time-frequency domain transformation;

extracting a subcarrier corresponding to a positioning reference signal of a frequency domain position of a current OFDM symbol as an effective subcarrier, and carrying out frequency domain phase correction on the positioning reference signal of the current effective subcarrier by adopting a frequency domain phase correction value;

wherein the frequency domain phase correction value and/or the time domain phase correction value is determined based on the frequency domain dynamic feedback output value.

Optionally, the phase jump detection specifically includes:

comparing the positioning reference signal phase of the current effective subcarrier after frequency domain phase correction with the positioning reference signal phase of the effective subcarrier sent by a sending end, and taking the frequency domain phase difference of the positioning reference signal phase and the positioning reference signal phase as the frequency domain phase difference corresponding to the current effective subcarrier;

based on the frequency domain phase difference, determining that the current effective subcarrier belongs to one of the following three cases:

the first case, single subcarrier phase abnormal jump;

In the second case, the continuous phase of a plurality of subcarriers is abnormal and jumps;

and in the third case, the subcarrier phase has no abnormal jump.

Optionally, if the absolute value of the frequency domain phase difference corresponding to the current effective subcarrier is greater than a first threshold value, determining that the current effective subcarrier belongs to the first condition;

if both of the following conditions are satisfied, it is determined that the condition is two:

first condition: the absolute value of the frequency domain phase difference corresponding to the current effective subcarrier is larger than a second threshold value;

second condition: the absolute value of the accumulated frequency domain phase difference is greater than a third threshold value; the accumulated frequency domain phase difference is obtained by the following steps: accumulating the frequency domain phase difference when the frequency domain phase difference corresponding to the current effective subcarrier is the same as the symbol phase of the frequency domain phase difference corresponding to the previous adjacent effective subcarrier; when the frequency domain phase difference corresponding to the current effective subcarrier is different from the sign bit of the frequency domain phase difference corresponding to the previous adjacent effective subcarrier, resetting the accumulated frequency domain phase difference result;

if the conditions of the first case and the second case are not met, determining that the first case and the second case belong to the third case;

if the conditions of the first case and the second case are met, the second case is finally determined.

Optionally, the determining the frequency domain dynamic feedback output value of the effective subcarrier according to the phase jump detection result specifically includes:

Calculating a dynamic adjustment feedback coefficient of the current effective subcarrier;

and multiplying the frequency domain phase difference corresponding to the effective subcarrier by the dynamic adjustment feedback coefficient of the current effective subcarrier to obtain a frequency domain dynamic feedback output value of the effective subcarrier.

Alternatively, the process may be carried out in a single-stage,

for the case three: the dynamic adjustment feedback coefficient is a first feedback coefficient, and the first feedback coefficient is determined according to the time delay detected by the frequency domain loop of the last OFDM symbol;

for the case one: the dynamic adjustment feedback coefficient is a first feedback coefficient multiplied by a preset first reduction coefficient;

for the second case: the dynamic adjustment feedback coefficient is a first feedback coefficient multiplied by a preset first reduction coefficient and then multiplied by a preset second reduction coefficient.

Optionally, the frequency domain phase correction value is determined by:

and in the current OFDM symbol, accumulating the frequency domain dynamic feedback output values of the effective subcarriers before the current effective subcarriers according to the order of the effective subcarriers, wherein the accumulated result is used as the frequency domain phase correction value of the current effective subcarriers.

Optionally, the method further comprises:

and multiplying the frequency domain phase correction value of the preset effective subcarrier of the current OFDM symbol by a preset time domain feedback coefficient to obtain the time domain feedback value of the current OFDM symbol.

Optionally, the time domain phase correction value is determined by:

and accumulating the time domain feedback values of the OFDM symbols before the current OFDM symbol according to the OFDM symbol sequence, and taking the accumulated result as a time domain phase correction value of the current OFDM symbol.

The carrier phase measuring device provided by the embodiment of the application comprises:

a memory for storing program instructions;

and the processor is used for calling the program instructions stored in the memory and executing according to the obtained program:

Optionally, the phase correction includes:

Optionally, the phase jump detection specifically includes:

the first case, single subcarrier phase abnormal jump;

and in the third case, the subcarrier phase has no abnormal jump.

Alternatively, the process may be carried out in a single-stage,

Optionally, the processor determines the frequency domain phase correction value by:

Optionally, the processor is further configured to:

Optionally, the processor determines the time domain phase correction value by:

Another carrier phase measurement device provided in an embodiment of the present application includes:

a first unit, configured to perform phase jump detection for an effective subcarrier in a current orthogonal frequency division multiplexing OFDM symbol of an input baseband signal;

the second unit is used for determining a frequency domain dynamic feedback output value of the effective subcarrier according to the phase jump detection result;

and a third unit, configured to perform phase correction on the input baseband signal based on the frequency domain dynamic feedback output value.

Another embodiment of the present application provides a computing device including a memory for storing program instructions and a processor for invoking program instructions stored in the memory to perform any of the methods described above in accordance with the obtained program.

Another embodiment of the present application provides a computer storage medium storing computer-executable instructions for causing the computer to perform any of the methods described above.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic flow chart of an overall scheme provided in an embodiment of the present application;

FIG. 2 is a diagram of a prior art frequency domain loop phase tracking value;

FIG. 3 is a schematic diagram of a frequency domain loop phase tracking value according to an embodiment of the present application;

Fig. 4 is a flow chart of a carrier phase measurement method according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a carrier phase measurement device according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of another carrier phase measurement device according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Compared with the existing positioning method in 3GPP Rel-16, the carrier phase measurement method can further improve the positioning accuracy and achieve centimeter-level positioning accuracy. The dual loop phase tracking scheme is an efficient orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplex, OFDM) carrier phase measurement method. The phase change of the input baseband signal can be tracked through the double-loop structure of the time domain loop and the frequency domain loop, and the carrier phase is obtained. When the carrier frequency of the 5G system is 3.5Hz, the carrier wavelength is about 8.6cm, and if the carrier phase measurement accuracy is 10%, the positioning measurement error is less than 8.6x10% =0.86 cm.

When the wireless channel condition is better, the dual-loop phase tracking scheme can effectively track the carrier phase of 5G NR, and high-precision positioning is realized. However, under relatively harsh radio channel conditions, such as multipath radio propagation conditions of low signal-to-noise ratio and/or low rice factor, the input signal phase itself may hop or continuously hop. At this time, the tracking performance of the frequency domain loop of the dual loop phase tracking scheme is degraded. The main reasons are as follows: the phase jump of the input signal causes the correction process of the frequency domain loop to generate an error correction signal, so that the frequency domain loop has large tracking error, and a series of problems such as tracking failure, cycle slip and the like can be generated.

Therefore, in the 5G NR system, achieving high-precision carrier phase positioning requires accurate acquisition of carrier phase values of received OFDM symbols. The embodiment of the application provides a scheme for improving the 5G NR carrier phase measurement performance, which can provide higher carrier phase measurement performance and is suitable for high-precision positioning in complex scenes.

The method and the device provided by the embodiment of the application are based on the same application conception, and because the principle of solving the problems by the method and the device is similar, the implementation of the device and the method can be mutually referred, and the repetition is not repeated.

The technical scheme provided by the embodiment of the application can be suitable for various systems, in particular to a 5G system. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet radio service (general packet radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G NR, and the like. Terminal devices and network devices are included in these various systems.

The terminal device according to the embodiment of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more core networks via the RAN, and may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in, or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. Such as personal communication services (personal communication service, PCS) phones, cordless phones, session initiation protocol (session initiated protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and embodiments of the present application are not limited in this respect.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells. A base station may also be referred to as an access point, or may refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or by other names, depending on the particular application. The network device may be operable to inter-convert the received air frames with internet protocol (internet protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiment of the present application may be a network device (base transceiver station, BTS) in a global system for mobile communications (global system for mobile communications, GSM) or code division multiple access (code division multiple access, CDMA), a network device (NodeB) in a wideband code division multiple access (wide-band code division multiple access, WCDMA), an evolved network device (evolutional node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station in a 5G network architecture (next generation system), a home evolved base station (home evolved node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), etc., which are not limited in the embodiment of the present application.

Various embodiments of the application are described in detail below with reference to the drawings attached to the specification. It should be noted that, the display sequence of the embodiments of the present application only represents the sequence of the embodiments, and does not represent the advantages or disadvantages of the technical solutions provided by the embodiments.

The technical scheme provided by the embodiment of the application is realized at the receiver side, and the realization entity is as follows:

for uplink positioning, the uplink positioning is realized by the base station.

For downlink positioning, this is achieved by the UE.

For positioning purposes, the wireless signals transmitted by the 5G NR transmitter include positioning reference signals. Upon receiving the wireless signal, the receiver extracts time-domain orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplex, OFDM) symbols containing the positioning reference signal at baseband according to the configuration information. The input baseband signal of the technical scheme provided by the embodiment of the application is OFDM symbol time domain sample point data from which the cyclic prefix is removed.

The main scheme provided by the embodiment of the application is shown in fig. 1, and comprises the following processing flows:

(1) Time domain correction: this step performs time domain phase correction on the current OFDM symbol of the input baseband signal based on the time domain phase correction value (i.e., the phase update value) provided by the time domain phase correction value update module.

As shown in fig. 1, the embodiment of the present application adopts two feedback loops, namely a time domain loop and a frequency domain loop. The feedback value (i.e., the instantaneous phase correction value) of the time domain loop is updated once per OFDM symbol, provided by the time domain phase correction value update module.

(2) And (3) time-frequency domain transformation: the baseband signal after the time domain phase correction is transformed from the time domain to the frequency domain.

(3) Correcting a frequency domain: the subcarriers corresponding to the frequency domain of the positioning reference signal may be extracted, and all or a part of the subcarriers may be extracted, which is called a valid subcarrier.

Specifically, the frequency domain position of the OFDM symbol of the input baseband signal has placed the positioning reference signal. In this step, the subcarriers corresponding to the positioning reference signals need to be extracted from the frequency domain position as effective subcarriers.

For the positioning reference signal of the effective subcarrier, the following two orders can be used for frequency domain correction:

sequentially carrying out frequency domain phase correction from the lowest frequency point to the highest frequency point;

and carrying out frequency domain phase correction sequentially from the highest frequency point to the lowest frequency point.

Wherein the frequency domain phase correction value (i.e., the frequency domain compensation value) used for the frequency domain phase correction is provided by the frequency domain phase correction value updating module. As shown in fig. 1, the embodiment of the present application adopts two feedback loops, namely a time domain loop and a frequency domain loop. The feedback value of the frequency domain loop (i.e., the frequency domain phase correction value) is updated in real time for each active subcarrier, provided by the frequency domain phase correction value update module.

(4) Calculating a frequency domain phase difference: and comparing the phase of the positioning reference signal after frequency domain phase correction with the phase of the received positioning reference signal corresponding to the effective subcarrier (namely, the positioning reference signal sent by the sending end), so as to obtain the frequency domain phase difference of the two signals.

(5) And (3) phase jump detection: the frequency domain phase difference of the effective sub-carrier wave in one OFDM symbol (OFDM symbol containing positioning reference signals in a plurality of external input OFDM) obtained in the step (4) is judged as follows, and a phase jump detection result is output, wherein the following three phase jump conditions are specifically adopted:

1. the single subcarrier phase transitions abnormally.

Judging the basis: the absolute value of the frequency domain phase difference corresponding to the current effective subcarrier is larger than a first threshold value.

2. The plurality of subcarriers are sequentially phase-abnormally hopped.

Judging the basis: the following 2 conditions need to be satisfied simultaneously:

the first condition judgment basis: the absolute value of the frequency domain phase difference of the current subcarrier is greater than a second threshold value.

And the second condition judgment basis: the symbol phase of the frequency domain phase difference of the current subcarrier and the previous adjacent effective subcarrier is the same, and the phase difference is accumulated. When the sign bit of the frequency domain phase difference of the current subcarrier and the previous adjacent effective subcarrier is different, the accumulated phase difference result is cleared. If the absolute value of the accumulated phase difference is larger than the third threshold value, the condition is met.

3. The subcarrier phase is free from abnormal jump.

Judging the basis: and when the two jump conditions are not satisfied.

If the phase jump of a subcarrier accords with the first case and the second case, outputting the result which only belongs to the second case.

The method for determining the three threshold values includes:

the first threshold value and the second threshold value (the magnitude relation of the two threshold values is not limited) are determined by the following method:

for OFDM symbol 1: a fixed value is preset based on different scenes, and the fixed value can be set according to simulation or can be determined based on field test.

For the remaining OFDM symbols: based on the average value of the absolute value of the frequency domain phase difference of the effective sub-carrier of the last OFDM symbol, the average value is multiplied by an amplification factor (preset constant).

The third threshold value determining method comprises the following steps: pi is multiplied by a reduction factor (preset constant).

(6) Frequency domain dynamic feedback:

firstly, according to the 3 phase jump conditions in the step (5), calculating a dynamic adjustment feedback coefficient (namely the following frequency domain feedback coefficient) of each effective subcarrier:

case one, no abnormal jump in subcarrier phase:

the frequency domain feedback coefficient is a first feedback coefficient, and the value is determined according to the time delay detected by the frequency domain loop of the last symbol. The larger the time delay, the larger the value of the frequency domain feedback coefficient, specifically, for example, the time delay is divided into several sections, and different frequency domain feedback coefficients are adopted for different sections.

Case two, single subcarrier phase anomaly hopping:

the frequency domain feedback coefficient is the first feedback coefficient multiplied by a first scaling factor (the predetermined constant may be different from the scaling factor).

In the third case, the feedback coefficients of the frequency domain of the continuous phase jump of the plurality of subcarriers are the first feedback coefficient multiplied by the first reduction coefficient and then multiplied by the second reduction coefficient (the preset constant can be different from the reduction coefficient).

And (2) multiplying the frequency domain phase difference in the step (4) by a dynamic adjustment feedback coefficient to obtain a frequency domain dynamic feedback output value.

(7) Updating the frequency domain phase correction value: and accumulating the frequency domain dynamic feedback output values according to the order of the effective subcarriers in the current OFDM symbol, wherein the accumulated result before the current subcarriers is used as the frequency domain phase correction value of the current subcarriers.

(8) Time domain feedback: the frequency domain phase correction value of the designated subcarrier (preset subcarrier, not fixed on a certain subcarrier) of the current OFDM symbol is multiplied by the time domain feedback coefficient (preset constant) to obtain the time domain feedback value of the symbol. All OFDM symbols use the same designated subcarriers.

(9) Updating the time domain phase correction value: the time domain feedback values are accumulated according to the OFDM symbol sequence, and the accumulated result before the current OFDM symbol is used as the time domain phase correction value of the current symbol.

An illustration of one specific embodiment is given below.

For example, a specific scheme provided by the embodiment of the application includes the following steps:

(1) Time domain correction:

the input baseband signal is an input OFDM symbol with the cyclic prefix removed, and the nth sampling point of the mth OFDM symbol is defined as

The time domain of the input baseband is first time domain corrected:

for m=0:

for m>0：

In the method, in the process of the application,for the mth OFDM symbol after time domain correction, time domain correction phase +.>The time domain corrected phase value updated in step 9 is provided by the time domain phase update module (j is an imaginary symbol).

(2) And (3) time-frequency domain transformation:

time domain corrected OFDM symbol by FFT processingTransform from time domain to frequency domain signal->Where l represents the first subcarrier in the mth OFDM symbol.

(3) Correcting a frequency domain:

from the slaveExtracting all sub-carriers corresponding to the frequency domain of the positioning reference signalReferred to as active subcarriers, where k represents the number of the extracted subcarriers, i.e., the number of the active subcarriers. For the effective sub-carrier, frequency domain correction is sequentially carried out from the zeroth sub-carrier to the last sub-carrier:

for k=0:

for k>0：

Wherein, the liquid crystal display device comprises a liquid crystal display device,and->Provided by the frequency domain phase update module.

(4) Calculating a frequency domain phase difference:

After the frequency domain signal is corrected, frequency domain phase difference calculation is performed. The positioning reference signal of the transmitting end isPositioning reference signal after receiving end frequency domain correction>Obtaining the frequency domain phase difference of the two>

(5) And (3) phase jump detection:

by sequentially judging the effective subcarrier phase difference in one OFDM symbol, 3 phase jump conditions are output:

single subcarrier phase anomaly hopping:

judging the basis:

a plurality of sub-carriers are continuously phase hopped:

the first condition judgment basis:

and the second condition judgment basis: when the subcarrier phase difference is the same as the sign of the previous adjacent subcarrier phase difference, accumulating the phase difference to obtainWhen the subcarrier phase difference is not the same sign as the previous adjacent subcarrier phase difference,if present->In the case of (2), this condition is satisfied.

Subcarrier phase no jump:

judging the basis: and when the two jump conditions are not satisfied.

The method for determining the threshold value comprises the following steps:

threshold_1 determination method: last symbolMultiplying the average value of (a) by the amplification factor a, a>1。

threshold_2 determination method: last symbolMultiplying the average value of (b) by the amplification factor b, b>1。

threshold_3 determination method: pi is multiplied by a reduction coefficient c,0< c <1.

(6) Frequency domain dynamic feedback:

firstly, according to the 3 phase jump conditions in the step (5), obtaining a dynamic adjustment feedback coefficient a of each effective subcarrier _f (k)。

Subcarrier phase no jump:

a _f (k)＝a _f

wherein 0 is<a _f ≤1。a _f And determining according to the delay tau detected by the frequency domain loop of the last OFDM symbol. The larger the time delay, a _f The larger the value. For example:

0us<τ<50 us: a, a _f ＝0.4

50<τ<500 us: a, a _f ＝0.6

500us<τ: a, a _f ＝0.8

Single subcarrier phase anomaly hopping:

a _f (k)＝α*a _f wherein alpha is a first reduction coefficient, and alpha is 0.ltoreq.alpha.ltoreq.1.

When a plurality of subcarriers are in continuous phase abnormal jump:

a _f (k)＝α*β*a _f (k-1) wherein β is a second reduction coefficient, 0.ltoreq.β.ltoreq.1.

Then, the frequency domain phase difference in the step (4) is multiplied by the dynamic adjustment feedback coefficient to obtain a frequency domain dynamic feedback output value:

(7) Updating the frequency domain phase correction value:

for k=0:

for k>0：

(8) Time domain feedback:

taking the frequency domain phase correction value of the 1 st subcarrier of the current symbolMultiplying by a time-domain feedback coefficient a _t Obtaining the time domain feedback value fb_time of the symbol ^m ：

This step belongs to the time domain loop correction described above.

(9) Updating the time domain phase correction value:

for m=0:

for m>0：

In summary, the technical solution provided by the embodiment of the present application can achieve the following beneficial effects:

the subcarrier level real-time correction is realized, the influence of input phase jump or continuous jump is effectively reduced, and the phase tracking performance of a frequency domain loop is improved, specifically:

The peak of the frequency domain loop phase tracking value (corresponding to the processing of the situation of single subcarrier phase abnormal jump) is avoided;

avoiding large jump and cycle slip of the frequency domain loop phase tracking value (corresponding to the processing of the situation of 'a plurality of subcarrier continuous phase abnormal jump';

the frequency domain loop tracking precision is improved, so that the final tracking precision of the time domain loop output is also improved. Corresponding to the overall effect of the phase jump detection and the frequency domain dynamic feedback processing, the peak, the large jump and the cycle jump of the phase in the frequency domain loop are eliminated, namely the phase tracking precision of the frequency domain loop is improved.

Simulation results are given by way of example:

in downlink positioning, 1 mobile UE tracks an example of a base station transmitting a positioning reference signal. Where the signal-to-noise ratio snr=5 dB, and the rice factor K of the fading channel=5 dB.

The rice factor is small due to the low input signal to noise ratio. The signal received by the receiver has serious phase jump condition, which easily causes the problem of frequency domain loop phase tracking.

Fig. 2 is a graph showing the result of frequency domain loop phase tracking prior to the use of an embodiment of the present application. It can be seen that: tracking phase glitches are large and a severe phase cycle slip occurs (cycle slip means that the phase jump value is 2 pi).

Fig. 3 is a graph showing the phase tracking result of the frequency domain loop after the embodiment of the present application is adopted. It can be seen that: by adopting the method provided by the embodiment of the application, the tracking phase burr is smaller, and the phase cycle slip is successfully restrained.

In summary, referring to fig. 4, a carrier phase measurement method provided in an embodiment of the present application includes:

s101, carrying out phase jump detection on effective subcarriers in a current Orthogonal Frequency Division Multiplexing (OFDM) symbol of an input baseband signal;

s102, determining a frequency domain dynamic feedback output value of the effective sub-carrier according to a phase jump detection result;

s103, based on the frequency domain dynamic feedback output value, carrying out phase correction on the input baseband signal.

The phase correction can be carried out on the input baseband signal based on the frequency domain dynamic feedback output value, and the phase correction can be carried out on the frequency domain and/or the time domain, so that the subcarrier level real-time correction is realized, the influence of phase jump or continuous jump of the input baseband signal is effectively reduced, the phase tracking performance of a frequency domain loop is improved, the final tracking precision of the time domain loop output is improved, the tracking phase burr is smaller, the phase cycle jump is successfully restrained, and the positioning measurement precision is improved.

For example, a carrier phase measurement method includes:

performing phase jump detection on effective subcarriers in a current Orthogonal Frequency Division Multiplexing (OFDM) symbol of an input baseband signal; for example, the detection result is a single subcarrier phase anomaly jump;

for the abnormal jump condition of the single subcarrier phase, calculating the dynamic adjustment feedback coefficient of the effective subcarrier as the first feedback coefficient multiplied by the first reduction coefficient; then multiplying the frequency domain phase difference corresponding to the effective subcarrier by the dynamic adjustment feedback coefficient of the effective subcarrier to obtain a frequency domain dynamic feedback output value corresponding to the effective subcarrier;

accumulating frequency domain dynamic feedback output values according to the order of the effective subcarriers in the current OFDM symbol, wherein the accumulated result before the current effective subcarriers is used as a frequency domain phase correction value of the current effective subcarriers;

extracting subcarriers corresponding to the frequency domain of the positioning reference signal as effective subcarriers for the baseband signal transformed to the frequency domain; and for the positioning reference signals of the effective subcarriers, sequentially adopting the frequency domain phase correction values corresponding to the effective subcarriers from the lowest frequency point to the highest frequency point to sequentially perform frequency domain phase correction.

In other words, in the embodiment of the present application, only the frequency domain phase correction may be performed, and of course, only the time domain phase correction may be performed in the same manner, which is not described herein.

Optionally, the phase correction includes:

It should be noted that, in the embodiment of the present application, only frequency domain phase correction may be performed, or only time domain phase correction may be performed, and of course, it is best to perform both frequency domain phase correction and time domain phase correction.

Optionally, the phase jump detection specifically includes:

the first case, single subcarrier phase abnormal jump;

and in the third case, the subcarrier phase has no abnormal jump.

Alternatively, the process may be carried out in a single-stage,

Optionally, the frequency domain phase correction value is determined by:

Optionally, the method further comprises:

Optionally, the time domain phase correction value is determined by:

Referring to fig. 5, a carrier phase measurement apparatus provided in an embodiment of the present application includes:

a memory 520 for storing program instructions;

a processor 500 for calling program instructions stored in the memory, executing according to the obtained program:

Optionally, the phase correction includes:

Optionally, the phase jump detection specifically includes:

the first case, single subcarrier phase abnormal jump;

and in the third case, the subcarrier phase has no abnormal jump.

Alternatively, the process may be carried out in a single-stage,

Optionally, the processor 500 determines the frequency domain phase correction value by:

Optionally, the processor 500 is further configured to:

Optionally, the processor 500 determines the time domain phase correction value by:

A transceiver 510 for receiving and transmitting data under the control of the processor 500.

Wherein in fig. 5, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 500 and various circuits of memory represented by memory 520, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. The transceiver 510 may be a number of elements, i.e., including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium. The processor 500 is responsible for managing the bus architecture and general processing, and the memory 520 may store data used by the processor 500 in performing operations.

The processor 500 may be a Central Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA), or a complex programmable logic device (Complex Programmable Logic Device, CPLD).

Referring to fig. 6, another carrier phase measurement apparatus provided in an embodiment of the present application includes:

a first unit 11, configured to perform phase jump detection for an effective subcarrier in a current orthogonal frequency division multiplexing OFDM symbol of an input baseband signal;

a second unit 12, configured to determine a frequency domain dynamic feedback output value of the effective subcarrier according to the phase jump detection result;

and a third unit 13, configured to perform phase correction on the input baseband signal based on the frequency domain dynamic feedback output value.

The device provided by the embodiment of the application can be a base station or a terminal and other equipment.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) 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: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

Embodiments of the present application provide a computing device, which may be specifically a desktop computer, a portable computer, a smart phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), and the like. The computing device may include a central processing unit (Center Processing Unit, CPU), memory, input/output devices, etc., the input devices may include a keyboard, mouse, touch screen, etc., and the output devices may include a display device, such as a liquid crystal display (Liquid Crystal Display, LCD), cathode Ray Tube (CRT), etc.

The memory may include Read Only Memory (ROM) and Random Access Memory (RAM) and provides the processor with program instructions and data stored in the memory. In the embodiment of the present application, the memory may be used to store a program of any of the methods provided in the embodiment of the present application.

The processor is configured to execute any of the methods provided by the embodiments of the present application according to the obtained program instructions by calling the program instructions stored in the memory.

An embodiment of the present application provides a computer storage medium storing computer program instructions for use in an apparatus provided in the embodiment of the present application, where the computer storage medium includes a program for executing any one of the methods provided in the embodiment of the present application.

The computer storage media may be any available media or data storage device that can be accessed by a computer, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), and semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), etc.

The method provided by the embodiment of the application can be applied to terminal equipment and network equipment.

The Terminal device may also be referred to as a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (RAN), or the like, and may optionally be capable of communicating with one or more core networks via a radio access network (Radio Access Network, RAN), for example, the Terminal may be a Mobile phone (or "cellular" phone), or a computer with Mobile properties, or the like, for example, the Terminal may also be a portable, pocket, hand-held, computer-built-in, or vehicle-mounted Mobile device.

The network device may be a base station (e.g., an access point) that refers to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to inter-convert the received air frames with IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate attribute management for the air interface. For example, the base station may be a base station (BTS, base Transceiver Station) in GSM or CDMA, a base station (NodeB) in WCDMA, an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in LTE, or a gNB in a 5G system, etc. The embodiment of the application is not limited.

The above-described method process flow may be implemented in a software program, which may be stored in a storage medium, and which performs the above-described method steps when the stored software program is called.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. 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, magnetic 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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.

It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

1. A carrier phase measurement method, the method comprising:

based on the frequency domain dynamic feedback output value, carrying out phase correction on the input baseband signal;

wherein the phase jump detection comprises:

the first case, single subcarrier phase abnormal jump;

the third condition is that the subcarrier phase has no abnormal jump;

the determining the frequency domain dynamic feedback output value of the effective subcarrier according to the phase jump detection result comprises the following steps:

2. The method of claim 1, wherein the active subcarriers comprise subcarriers corresponding to a frequency domain of a positioning reference signal within the OFDM symbol.

3. The method of claim 1, wherein the phase correction comprises:

4. The method of claim 1, wherein the determination of the first condition is made if an absolute value of a frequency domain phase difference corresponding to the currently active subcarrier is greater than a first threshold value;

5. The method of claim 1, wherein the step of determining the position of the substrate comprises,

6. A method according to claim 3, wherein the frequency domain phase correction value is determined by:

7. The method of claim 6, wherein the method further comprises:

8. The method of claim 7, wherein the time domain phase correction value is determined by:

9. A carrier phase measurement apparatus, the apparatus comprising:

A memory for storing program instructions;

the phase jump detection includes:

the first case, single subcarrier phase abnormal jump;

the third condition is that the subcarrier phase has no abnormal jump;

10. The apparatus of claim 9, wherein the active subcarriers comprise subcarriers corresponding to a frequency domain of a positioning reference signal within the OFDM symbol.

11. The apparatus of claim 9, wherein the phase correction comprises:

12. The apparatus of claim 9, wherein the determination of the condition one is made if an absolute value of a frequency domain phase difference corresponding to the currently active subcarrier is greater than a first threshold value;

13. The apparatus of claim 9, wherein the device comprises a plurality of sensors,

14. The apparatus of claim 9 wherein said processor determines said frequency domain phase correction value by:

15. The apparatus of claim 14, wherein the processor is further configured to:

16. The apparatus of claim 15 wherein said processor determines said time domain phase correction value by:

17. A carrier phase measurement apparatus, the apparatus comprising:

a third unit, configured to perform phase correction on an input baseband signal based on the frequency domain dynamic feedback output value;

wherein the phase jump detection comprises:

the first case, single subcarrier phase abnormal jump;

the third condition is that the subcarrier phase has no abnormal jump;

18. A computer storage medium having stored thereon computer executable instructions for causing the computer to perform the method of any one of claims 1 to 8.