WO2016101668A1

WO2016101668A1 - Carrier phase estimation method and device and storage medium

Info

Publication number: WO2016101668A1
Application number: PCT/CN2015/090989
Authority: WO
Inventors: 姚扬中; 李强; 黄源良; 蔡轶
Original assignee: 深圳市中兴微电子技术有限公司
Priority date: 2014-12-23
Filing date: 2015-09-28
Publication date: 2016-06-30
Also published as: CN105790848A; CN105790848B

Abstract

Provided in the present invention is a carrier phase estimation device. The device comprises: a fourth-power signal phase angle determination unit, an accumulated phase angle transition value determination unit, and a carrier phase compensation angle value determination unit, where the fourth-power signal phase angle determination unit is configured to determine a fourth-power signal phase angle by performing a fourth-power operation on a received signal, the accumulated phase angle transition value determination unit is configured to determine an accumulated phase angle transition value on the basis of the fourth-power signal phase angle, and the carrier phase compensation angle value determination unit is configured to determine a carrier phase compensation angle value on the basis of the fourth-power signal phase angle and of the accumulated phase angle transition value. Also provided are a carrier phase estimation method and a storage medium.

Description

Carrier phase estimation method, device and storage medium

Technical field

The present invention relates to optical communication technologies, and in particular, to a carrier phase estimation method, apparatus, and storage medium for optical fiber communication.

Background technique

With the increase of Internet traffic, the capacity of optical communication systems in Internet backbone systems is also increasing. As the wavelength bit rate increases, chromatic dispersion, polarization mode dispersion, and waveform distortion of various nonlinear effects on the transmission path cause severe degradation of information quality.

Digital coherence technology is used as a key technology in high-speed optical communication systems. Compared with non-coherent technology, it has the following advantages: about 3dB optical signal-to-noise ratio (OSNR) gain; it can be easily solved by electrical equalization technology. Channel variation, which reduces costs; in addition, digital coherence technology can use more efficient modulation techniques and polarization multiplexing to increase transmission capacity; therefore, digital coherence technology is considered to be a key technology for high-speed optical communication systems.

In a coherent optical communication system, since the laser at the transmitting end and the local oscillator laser at the receiving end have a certain line width, phase recovery is necessary to obtain a correct signal at the receiving end.

However, most of the unwrap methods involved in the phase recovery process are serial operations or more complex parallel operations. For example, the existing typical parallel unwrapping is implemented in two steps: first step, parallel The phase offset adjustment in the segment; the second step, the phase offset adjustment between the parallel segments; the implementation of the unwrapping circuit realizes a complicated structure and a large delay.

It can be seen from the above process that the serial unwrapping method of the existing phase estimation is inefficient, and the parallel unwrapping method is complicated in implementation, large in circuit scale, large in delay, and large in power consumption. Therefore, there is an urgent need for an efficient parallel de-winding implementation method to efficiently implement carrier phase estimation.

Summary of the invention

In view of this, the embodiment of the present invention is to provide a carrier phase estimation method, device, and storage medium, which solves the problems of complex implementation, large circuit scale, large delay, and large power consumption of the existing parallel unwrapping method.

To achieve the above objective, the technical solution of the embodiment of the present invention is implemented as follows:

An embodiment of the present invention provides a carrier phase estimation apparatus, where the apparatus includes: a fourth power signal phase angle determining unit, a cumulative phase angle hopping value determining unit, and a carrier phase compensation angle value determining unit;

The fourth power signal phase angle determining unit is configured to perform a fourth power operation on the received signal to determine a fourth power signal phase angle;

The cumulative phase angle hopping value determining unit is configured to determine a cumulative phase angle hopping value according to the fourth power signal phase angle;

The carrier phase compensation angle value determining unit is configured to determine a compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value.

In the above solution, the fourth power signal phase angle determining unit is configured to:

The signal after the received frequency offset compensation is taken to the fourth power to obtain a fourth power signal;

The fourth power signal is averaged to determine the fourth power signal phase angle.

In the above solution, the cumulative phase angle hopping value determining unit includes a phase angle difference numerator unit, a rounding subunit, and an accumulating subunit, wherein:

The phase angle difference molecular unit is configured to differentiate the phase angle of the fourth power signal to determine a differential phase angle;

The rounding subunit is configured to round the differential phase angle to determine a phase angle hopping value;

The accumulating subunit is configured to accumulate the phase angle hopping value, and modulate the accumulated phase angle hopping value to determine a cumulative phase angle hopping value.

In the above solution, the carrier phase compensation angle value determining unit includes a unwrapped carrier phase a value determining subunit, a compensating subunit; wherein

The unwrapping carrier phase value determining subunit is configured to divide a sum of the fourth power signal phase angle and the accumulated phase angle hopping value by 4 to determine a unwrapped carrier phase value;

The compensation subunit is configured to compensate the de-wound carrier phase value to determine a compensation phase value of the carrier phase.

In the above solution, the compensation subunit is configured to: add the unwrapped carrier phase value by 1/8 rotation to obtain a compensation phase value of the carrier phase.

An embodiment of the present invention further provides a carrier phase estimation method, where the method includes:

Performing a fourth power operation on the received signal to determine a phase angle of the fourth power signal;

Determining a cumulative phase angle hopping value according to the fourth power signal phase angle;

A compensation angle value of the carrier phase is determined according to the fourth power signal phase angle and the cumulative phase angle hopping value.

In the above solution, the fourth-order operation is performed on the received signal, and determining the phase angle of the fourth-order signal includes:

In the above solution, determining the cumulative phase angle hopping value according to the fourth power signal phase angle includes:

Differentiating the phase angle of the fourth power signal to determine a differential phase angle;

Rounding the differential phase angle to determine a phase angle hopping value;

The phase angle hopping value is accumulated, and the accumulated phase angle hopping value is modulo 4 to determine a cumulative phase angle hopping value.

In the above solution, the determining the compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value includes:

Deciphering the sum of the fourth power signal phase angle and the cumulative phase angle hopping value by four Carrier phase value;

Compensating the unwrapped carrier phase value to determine a compensation angle value of the carrier phase.

In the above solution, the canceling the phase value of the unwrapped carrier, and determining the compensation angle value of the carrier phase includes but is not limited to: adding 1/8 rotation of the phase value of the unwrapped carrier to obtain a compensation angle of the carrier phase value.

The embodiment of the present invention further provides a computer storage medium storing a computer program for performing a carrier phase estimation method according to an embodiment of the present invention.

The carrier phase estimation method, device and storage medium provided by the embodiments of the present invention first perform a fourth power operation on the received signal to determine a phase angle of the fourth power signal; and then determine the accumulation according to the phase angle of the fourth power signal. a phase angle hopping value; then determining a compensation angle value of the carrier phase based on the fourth power signal phase angle and the cumulative phase angle hopping value. In this way, the problems existing in the implementation of the existing parallel unwrapping method, large circuit scale, large delay, and large power consumption can be solved.

DRAWINGS

1 is a schematic flow chart of a typical quadratic phase estimation method;

2 is a schematic structural diagram of a carrier phase estimation apparatus according to an embodiment of the present invention;

3 is a schematic structural diagram of an algorithm for unwrapping a carrier phase value determining subunit according to an embodiment of the present invention;

4 is a schematic structural diagram of a binary algorithm for determining a sub-unit of a wrap-around carrier phase value according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of a carrier phase estimation method according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic flowchart of a method for determining a cumulative phase angle hopping value according to an embodiment of the present invention.

detailed description

Most of the existing phase estimation algorithms are based on the M-th power algorithm or the maximum likelihood algorithm. The M-th power algorithm was first applied to the quadrature phase shift keying (QPSK) coded phase estimation. Assume that the phase of the kth symbol after equalization and polarization demultiplexing of the coherent receiving system is: θ _k = θ _s (k) + ΔωkT + θ _n + θ _ASE , where θ _s (k) is the modulation phase of the signal ΔωkT is the phase error component caused by the carrier frequency offset. This component is removed by the carrier frequency offset estimation and compensation algorithm. θ _n is the phase caused by the laser line width, and θ _ASE is the noise phase. Then, after the frequency offset compensation, the ΔωkT component Should be removed; for QPSK/Differential Quadrature Reference Phase Shift Keying (DQPSK) modulation,

After the quadratic power of the receiving system after equalization and polarization demultiplexing and frequency offset compensation, the phase of the fourth power of the kth symbol can be expressed as 4θ _s (k) + 4θ _n + 4θ _ASE , 4θ The value after 2π on the _s (k) mode is π, so the fourth-order operation can remove the symbol modulation phase. In order to reduce the influence of noise, the fourth-order signal can be subjected to moving average filtering, and then the complex phase of the filtered signal is averaged, then the angular unwrapping is performed, and divided by 4, and finally the estimated phase value is obtained. Figure 1 is a schematic flow chart of a typical quadratic phase estimation method.

Most of the current coherent optical communication systems use QPSK as the modulation format. In order to improve the transmission capacity, a higher order modulation format, such as 16 Quadrature Amplitude Modulation (QAM), can be used. The basic steps are as follows: The fourth power is then grouped according to the amplitude, for example, into three groups; the fourth power signal of the second group is removed, the first and third group points are retained, and the moving average is performed; then the complex phase angle is obtained. Solve the winding and so on. However, most of the existing unwrapping methods are serial operations, or more complex parallel operations. For example, the existing typical parallel unwrapping is implemented in two steps: first step, phase offset adjustment in parallel segments; second step The phase offset adjustment between the parallel segments; the implemented unwrapping circuit realizes a complicated structure and a large delay.

In the embodiment of the present invention, a carrier phase estimation apparatus is provided, where the apparatus includes: a fourth power signal phase angle determining unit, a cumulative phase angle hopping value determining unit, and a carrier phase compensation angle value determining unit; The fourth power signal phase angle determining unit is configured to perform a fourth power operation on the received signal to determine a fourth power signal phase angle; the cumulative phase angle hopping value determining unit is configured to be according to the fourth The phase angle of the secondary signal determines the cumulative phase angle hopping value; The carrier phase compensation angle value determining unit is configured to determine a compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value.

In practical applications, since the 128Gb/s polarization multiplexing-quadrature phase shift keying (PM-QPSK) coherent optical communication receiver has both x-polarization and y-polarization signals after equalization and polarization demultiplexing, After the polarization signal and the y-polarization signal are compensated for frequency offset, there is also a phase error component caused by the line width of the laser, and the phase error needs to be estimated, that is, the compensation angle value of the carrier phase needs to be calculated and compensated. The two-channel signals of the x-polarization and the y-polarization need to be separately estimated. In the carrier phase estimation apparatus according to the embodiment of the invention, the input signal is a signal after the equalization and polarization demultiplexing and the frequency offset compensation are completed. In the case of a polarization-multiplexed coherent optical communication system having two polarization signals of x-polarization and y-polarization, carrier phase estimation needs to be performed independently for each signal. Therefore, two of the carrier phase estimation devices are required.

The implementation of the technical solution of the embodiment of the present invention is described in detail below with reference to the accompanying drawings and embodiments. 2 is a schematic structural diagram of a carrier phase estimation apparatus according to an embodiment of the present invention. As shown in FIG. 2, a carrier phase estimation apparatus according to an embodiment of the present invention includes the following structure: a fourth power signal phase angle determining unit 21, and a cumulative phase angle hopping value determining unit. 22. A carrier phase compensation angle value determining unit 23; wherein

The fourth power signal phase angle determining unit 21 is configured to perform a fourth power operation on the received signal to determine a fourth power signal phase angle;

In the embodiment of the present invention, the received signal is a signal after frequency offset compensation; the fourth power signal phase angle determining unit 21 is configured to: take a quadratic power of the received frequency offset compensation signal to obtain The fourth power signal; the fourth power signal is averaged, the fourth power signal phase angle is determined, and the determined fourth power signal phase angle is sent to the cumulative phase angle jump value determining unit 22.

Commonly used angle units include: Radians, Degrees, Turns, etc. The conversion relationship of each angle unit is: 2π radians = 360 degrees = 1 revolution. In most communication systems, for the convenience of fixed point, the angle is generally measured in Turns. In the embodiment of the present invention, the angle is also in units of Turns.

The fourth power signal phase angle determining unit 21 determines that the fourth power signal phase angle value ranges from [0, 1) revolutions. In the embodiment of the present invention, the phase angle of the fourth-order signal of the k-th symbol is θ _Nk+1 , . . . , θ _Nk+N , where N is the degree of parallelism;

When the fourth power signal phase angle determining unit 21 takes an average value of the fourth power signal, for the QPSK/DQPSK modulation system, the fourth power signal can be directly averaged, and for the 16QAM modulated signal, some existing improvements need to be applied. The fourth-order averaging method, such as removing the medium-amplitude quadratic signal, and then performing the averaging operation.

In the embodiment of the present invention, the parallelism degree N=64 is taken as an example, and the signal input by the fourth power signal phase angle determining unit 21 is a frequency offset compensation signal with a parallel degree of 64; the fourth power signal phase angle determining unit 21 The input signal is subjected to a fourth power operation, and the fourth power signal is subjected to moving average filtering, and the fourth power signal is subjected to moving average filtering to average the fourth power signal.

For high-speed symbol streams, the phase noise is a slow-changing signal, which can be regarded as basically constant in several consecutive symbols. Therefore, for a number of symbols continuously input to the algorithm, it is regarded as a group, and finally calculated. The compensation phase value of the carrier phase is shared by all symbols of this group. Under normal circumstances, the compensation angle values of the carrier phases of adjacent symbols are not much different. Therefore, in order to reduce the workload, it is also possible to perform four-input operation on the fourth-order signal after the moving average filtering, and only output 64. /4 = 16 average filtered fourth power signals; four pumping ones are not necessarily performed. After the four-plot operation, the parallelism N of each processing unit in the subsequent processing is 16; then, the complex filtered fourth-order signal is used to obtain a complex phase angle; the complex phase angle can often be determined by Cordic, etc. Algorithm; Finally, the fourth power signal phase angle determining unit 21 outputs a fourth power signal phase angle of parallelism of 16 to the cumulative phase angle hopping value determining unit 22.

The cumulative phase angle hopping value determining unit 22 is configured to determine a cumulative phase angle hopping value according to the fourth power signal phase angle;

In the embodiment of the present invention, the cumulative phase angle hopping value determining unit 22 includes: a phase angle difference numerator unit 221, a phasing subunit 222, and an accumulating subunit 223, and correspondingly, the fourth power signal phase The angle determining unit 21 transmits the determined fourth-order signal phase angle to the cumulative phase angle hopping value determining unit 22 as follows: the fourth-order signal phase angle determining unit 21 transmits the determined fourth-order signal phase angle to the phase angle Differential molecular unit 221; in one embodiment:

The phase angle difference molecular unit 221 is configured to differentiate the phase angle of the fourth power signal, determine a differential phase angle, and send the differential phase angle to the rounding subunit 222;

The phase angle difference molecular unit 221 differentiates the phase angle of the fourth power signal, and determining the differential phase angle includes: subtracting the phase angles of two adjacent fourth power signals, that is, the front quadratic signal phase The angle is subtracted from the adjacent fourth-order signal phase angle to obtain the differential phase angle δ _Nk+i :

δ _Nk+i =θ _Nk+i -θ _Nk+i-1 ;i=1,...N;

The differential phase angle has a value range of (-1, 1) revolutions.

Still taking the above example as an example, the first element of the differential phase angle is: the last element of the phase angle of the fourth power signal of the previous beat minus the first element of the phase angle of the fourth power signal. After the fourth power signal phase angle determining unit 21 performs a four-pick operation on the moving average filtered fourth power signal, the value range of i is: i=2, . . . , 16, the i-th of the differential phase angle The elements are: the i-th element of the fourth-order signal phase angle minus the ith element of the fourth-order signal phase angle.

The rounding subunit 222 is configured to round the differential phase angle, determine a phase angle hopping value, and send the phase angle hopping value to the accumulating unit;

In the embodiment of the present invention, the rounding sub-unit 222 rounds the differential phase angle in a rounded manner.

The rounding sub-unit 222 rounds the differential phase angle in a rounded manner by adding 0.5 to the differential phase angle, and then rounding down using the floor function; the rounding sub-unit 222 is rounded up. The value may be -1, 1, 0. To obtain a phase angle hopping value of a non-negative integer, the rounding sub-unit 222 modulo 4 the rounded value to obtain a phase angle hopping value Δ of a non-negative integer. _Nk+1 :

Δ _Nk+1 = mod(floor(θ _Nk+i +0.5), 4); i=1, . . . N;

Where floor represents the rounding, mod(., 4) represents the modulo 4 operation; the non-negative integer phase angle hopping value ranges from {3, 1, 0}; the implementation process can use 2 bits without Symbol binary number representation.

The accumulating subunit 223 is configured to accumulate the phase angle hopping value, and modulate the accumulated phase angle hopping value 4 to determine a cumulative phase angle hopping value; and then the cumulative phase angle hopping The value is sent to the carrier phase compensation angle value determining unit 23.

The accumulating subunit 223, when accumulating the phase angle hopping value, inputs a phase angle hopping value of the parallelism N, and outputs the cumulative phase angle hopping value of the parallelism N. The accumulating subunit 223 includes a status register, and N summing modules; here, when the fourth power signal phase angle determining unit 21 performs four pumping operations on the sliding average filtered fourth power signal, the parallelism N It is 1/4 of the original; that is, when the initial value of N is 64, after performing four pumping operations, N=16, the accumulating subunit 223 includes 16 summing modules; the initial value of the status register is 0. The i-th summation module adds the state register value and the phase-jump value to the i+1th number of the first to the ith element values to obtain the i-th element η _{Nk+i of the} cumulative phase angle hopping value. :

Here, i is 1, 2, ..., N; mod (., 4) represents a modulo 4 operation. In the implementation process, the summation module input is a 2-bit unsigned binary number, and the output is also a 2-bit unsigned binary number; the result of the summation module only retains the low-end 2 bits, and the overflow part is discarded, and The value of the last element of the phase angle jump value, the value of the Nth element of the phase angle jump value, is assigned to the status register.

The carrier phase compensation angle value determining unit 23 is configured to determine a compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value.

In an embodiment, the carrier phase compensation angle value determining unit 23 includes a unwrapping carrier phase value sub-unit 231 and a compensation sub-unit 232, where

The unwrapping carrier phase value determining subunit 231 is configured to phase the fourth power signal phase Determining the unwrapped carrier phase value by dividing the sum of the accumulated phase angle hopping values by four;

FIG. 3 is a schematic structural diagram of an algorithm for unwrapping a carrier phase value determining sub-unit 231 according to an embodiment of the present invention. As shown in FIG. 3, the unwrapped carrier phase value determining sub-unit 231 sets the fourth-order signal phase angle θ _Nk+i Determining the unwrapped carrier phase value by dividing the sum of the cumulative phase angle hopping values η _Nk+i by 4;

4 is a schematic structural diagram of a binary algorithm of the unwrapping carrier phase value determining sub-unit 231 according to an embodiment of the present invention, as shown in FIG. 4: θ _Nk+i is an M-bit binary number, and η _Nk+i is a two-digit binary number, and the solution is The wrap-around carrier phase value determining sub-unit 231 combines the accumulated phase angle hopping value of the two bits with the M-bit quadratic signal phase angle value and combines them into an M+2 bit binary number, the high end of the M+2 bit binary number 2 bits are cumulative phase angle hopping values, and the remaining low end bits are quadratic signal phase angle values; in the embodiment of the invention, the cumulative phase angle hopping value of the two bits and the M-bit quadratic signal phase are The angle combination is essentially a bit combination of the cumulative phase angle hopping value and the fourth power signal phase angle, the cumulative phase angle as the high end bit, and the fourth power signal phase angle as the low end bit.

The compensation sub-unit 232 is configured to compensate the phase-off carrier phase value and determine a compensation phase value of the carrier phase. The method includes: adding the unwrapped carrier phase value by 1/8 rotation to obtain carrier phase compensation. Angle value.

In the embodiment of the present invention, in order to ensure that the compensation angle value of the finally determined carrier phase is located between four quadrants instead of being located on four coordinate axes, the phase value of the unwrapped carrier needs to be added by 1/8 rotation. The final carrier phase compensation angle value.

The embodiment of the present invention further provides a carrier phase estimation method. FIG. 5 is a schematic flowchart of a carrier phase estimation method according to an embodiment of the present invention. As shown in FIG. 5, the carrier phase estimation method according to the embodiment of the present invention includes the following steps:

Step 501: Perform a fourth power operation on the received signal to determine a phase angle of the fourth power signal;

In the embodiment of the present invention, the fourth-order operation is performed on the received signal, and determining the phase angle of the fourth-order signal includes: taking the quadratic power of the received frequency offset compensation signal to obtain a fourth-order signal; The fourth power signal takes an average value to determine a fourth power signal phase angle.

Commonly used angle units include: Radians, Degrees, Turns, etc. The unit conversion relationship for each angle is 2π radians = 360 degrees = 1 revolution. In most communication systems, for the convenience of fixed point, the angle is generally measured in Turns. In the embodiment of the present invention, the angle is also in units of Turns.

In the embodiment of the present invention, the determined fourth-order signal phase angle value ranges from [0, 1). Here, let the k-th symbol quadratic signal phase angle be θ _Nk+1 , ..., θ _{Nk + N} , where N is the degree of parallelism;

In this step, when the average value of the fourth power signal is taken, for the QPSK/DQPSK modulation system, the fourth power signal can be directly averaged, and for the 16QAM modulated signal, some existing improved fourth power averaging methods need to be applied, for example, The medium-amplitude fourth-order signal is removed and the averaging operation is performed.

In the embodiment of the present invention, taking the degree of parallelism N=64 as an example, first performing a fourth power operation on the input signal, and then performing a moving average filtering on the fourth power signal, and performing a moving average filtering on the fourth power signal is The fourth-order signal takes the mean.

For high-speed symbol streams, the phase noise is a slow-changing signal, which can be regarded as basically constant in several consecutive symbols. Therefore, for a number of symbols continuously input to the algorithm, it is regarded as a group, and finally calculated. The compensation phase value of the carrier phase is shared by all symbols of this group. Under normal circumstances, the compensation angle values of the carrier phases of adjacent symbols are not much different. Therefore, in order to reduce the workload, it is also possible to perform four-input operation on the fourth-order signal after the moving average filtering, and only output 64. /4 = 16 average filtered fourth power signals; four pumping ones are not necessarily performed. After performing the four-plot operation, the parallelism N in the subsequent processing is 16; then, the average filtered fourth-order signal is used to obtain a complex phase angle; and the complex phase angle can often be performed by an algorithm such as Cordic; Finally, the output parallelism is 16 to the fourth power signal phase angle.

Step 502: Determine a cumulative phase angle hopping value according to the fourth power signal phase angle;

FIG. 6 is a schematic flowchart of a method for determining a cumulative phase angle hopping value according to an embodiment of the present invention. As shown in FIG. 6, the method includes the following steps:

Step 502A: Differentiating the phase angle of the fourth power signal to determine a differential phase angle;

In an embodiment, the phase angles of two adjacent quadratic signals are subtracted, that is, the phase angles of the preceding fourth power signals are subtracted from the phase angles of the adjacent fourth power signals to obtain a differential phase angle δ _{Nk +i} :

δ _Nk+i =θ _Nk+i -θ _Nk+i-1 ;i=1,...N;

The differential phase angle has a value range of (-1, 1) revolutions.

Step 502B: Rounding the differential phase angle to determine a phase angle hopping value;

In one embodiment, the differential phase angles are rounded in a rounded manner. The implementation manner is as follows: adding the differential phase angle to 0.5, and then rounding down using the floor function; the rounded sub-unit 222 may have a value of -1, 1, 0, to obtain a phase angle of a non-negative integer. The hop value, the rounding sub-unit 222 modulates the rounded value modulo 4 to obtain a phase angle hopping value _{ΔNk+1 of a} non-negative integer:

Δ _Nk+1 = mod(floor(θ _Nk+i +0.5), 4); i=1, . . . N;

Step 502C: accumulating the phase angle hopping value, and modulo 4 the accumulated phase angle hopping value to determine a cumulative phase angle hopping value;

In an embodiment, when the phase angle hopping value is accumulated, the phase angle hopping value of the parallelism N is input, and the output is the cumulative phase angle hopping value of the parallelism N. Here, when the fourth power signal phase angle determining unit 21 performs a four-pick operation on the moving average filtered fourth power signal, the parallelism N is the original 1/4; that is, when the initial value of N is 64. After performing four pumping operations, N=16, thus requiring 16 summing modules; the initial value of the status register is 0, and the i-th adding module will be the state register value and the phase angle jump value first to the first The i element values are added together with i+1 numbers to obtain the i-th element η _{Nk+i of the} cumulative phase angle hopping value:

Step 503: Determine a compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value;

In an embodiment, first, dividing the sum of the fourth power signal phase angle and the cumulative phase angle hopping value by 4, determining a unwrapped carrier phase value; and then compensating the unwrapped carrier phase value, Determine the compensation angle value of the carrier phase.

The binary algorithm for determining the phase value of the unwrapped carrier is determined by dividing the sum of the fourth power signal phase angle and the cumulative phase angle hopping value by 4, and the cumulative phase angle hopping value and the M bit of the two bits are The fourth-order signal phase angle values are combined and merged into M+2 bit binary numbers. The high-end 2 bits of the M+2 bit binary number are cumulative phase angle hopping values, and the remaining low-end bits are quadratic signal phases. Angle value. In the embodiment of the present invention, the combining the cumulative phase angle hopping value of the two bits and the phase angle of the M-bit quadratic signal substantially combines the cumulative phase angle hopping value with the fourth power signal phase angle. The cumulative phase angle is used as the high-end bit, and the fourth-order signal phase angle is used as the low-end bit.

The compensating the phase value of the unwrapped carrier, and determining the compensation angle value of the carrier phase comprises: adding the unwrapped carrier phase value by 1/8 rotation to obtain a compensation phase value of the carrier phase.

In the embodiment of the present invention, in order to ensure that the compensation angle value of the finally determined carrier phase is located at four Between the quadrants, rather than on the four coordinate axes, the unwrapped carrier phase value needs to be added 1/8 turn to obtain the final carrier phase compensation angle value.

Each of the processing units in the carrier phase estimation apparatus shown in FIG. 2 may be implemented by a processor, and may of course be implemented by a specific logic circuit; wherein the processor may be a processor on a mobile terminal or a server, In practical applications, the processor can be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA).

In the embodiment of the present invention, if the carrier phase estimation method described above is implemented in the form of a software function module and sold or used as a stand-alone product, it may also be stored in a computer readable storage medium. Based on such understanding, the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions. A computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention. The foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

Correspondingly, an embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores a computer program for performing the foregoing carrier phase estimation method according to an embodiment of the present invention.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Claims

A carrier phase estimating device, the device comprising: a fourth power signal phase angle determining unit, a cumulative phase angle hopping value determining unit, and a carrier phase compensation angle value determining unit; wherein

The fourth power signal phase angle determining unit is configured to perform a fourth power operation on the received signal to determine a fourth power signal phase angle;

The cumulative phase angle hopping value determining unit is configured to determine a cumulative phase angle hopping value according to the fourth power signal phase angle;

The carrier phase compensation angle value determining unit is configured to determine a compensation angle value of the carrier phase according to the fourth power signal phase angle and the accumulated phase angle hopping value.
The apparatus according to claim 1, wherein said fourth power signal phase angle determining unit is configured to:

The signal after the received frequency offset compensation is taken to the fourth power to obtain a fourth power signal;

The fourth power signal is averaged to determine the fourth power signal phase angle.
The apparatus according to claim 1, wherein said cumulative phase angle jump value determining unit comprises a phase angle difference molecular unit, a rounding subunit, and an accumulating subunit, wherein:

The phase angle difference molecular unit is configured to differentiate the phase angle of the fourth power signal to determine a differential phase angle;

The rounding subunit is configured to round the differential phase angle to determine a phase angle hopping value;

The accumulating subunit is configured to accumulate the phase angle hopping value, and modulate the accumulated phase angle hopping value to determine a cumulative phase angle hopping value.
The apparatus according to claim 1, wherein said carrier phase compensation angle value determining unit comprises a unwrapped carrier phase value determining subunit, and a compensating subunit; wherein

The unwrapping carrier phase value determining subunit is configured to divide a sum of the fourth power signal phase angle and the accumulated phase angle hopping value by 4 to determine a unwrapped carrier phase value;

The compensation subunit is configured to compensate the de-wound carrier phase value to determine a compensation phase value of the carrier phase.
The apparatus according to claim 4, wherein said compensating subunit is configured to: add said unwrapped carrier phase value by 1/8 revolution to obtain a compensated angle value of the carrier phase.
A carrier phase estimation method, the method comprising:

Performing a fourth power operation on the received signal to determine a phase angle of the fourth power signal;

Determining a cumulative phase angle hopping value according to the fourth power signal phase angle;

A compensation angle value of the carrier phase is determined according to the fourth power signal phase angle and the cumulative phase angle hopping value.
The method of claim 6 wherein said quadratic operation is performed on said received signal to determine a fourth power signal phase angle comprising:

The signal after the received frequency offset compensation is taken to the fourth power to obtain a fourth power signal;

The fourth power signal is averaged to determine the fourth power signal phase angle.
The method of claim 6 wherein said determining said cumulative phase angle hopping value based on said fourth power signal phase angle comprises:

Differentiating the phase angle of the fourth power signal to determine a differential phase angle;

Rounding the differential phase angle to determine a phase angle hopping value;

The phase angle hopping value is accumulated, and the accumulated phase angle hopping value is modulo 4 to determine a cumulative phase angle hopping value.
The method of claim 6 wherein said determining a compensation angle value for the carrier phase based on said fourth power signal phase angle and said cumulative phase angle hop value comprises:

Deciding the unwrapped carrier phase value by dividing the sum of the fourth power signal phase angle and the cumulative phase angle hopping value by four;

Compensating the unwrapped carrier phase value to determine a compensation angle value of the carrier phase.
The method of claim 9 wherein said pair of said unwrapped carrier phase values For compensation, determining the compensation angle value of the carrier phase includes, but is not limited to, adding 1/8 rotation to the unwrapped carrier phase value to obtain a compensation phase value of the carrier phase.
A computer storage medium having stored therein computer executable instructions for performing the carrier phase estimation method of any one of claims 6 to 10.