WO2018188016A1 - Channel estimation method, apparatus and system for frequency-hopping signals - Google Patents

Abstract

Provided are a channel estimation method, apparatus and system for frequency-hopping signals, relating to the technical field of communications. The method comprises: when a channel estimation request is received, performing channel estimation on a frequency-hopping signal at each frequency-hopping time slot in received frequency-hopping signals at n frequency-hopping time slots, so as to obtain n channel estimation values, wherein each of the channel estimation values corresponds to one frequency band; and eliminating, in the n channel estimation values, an amplitude difference and a phase difference between two channel estimation values with frequency bands thereof being adjacent, so as to obtain n updated channel estimation values. Since the amplitudes and phases of the n updated channel estimation values are continuous, the n updated channel estimation values are equal to a channel estimation value of one broadband signal, and compared with a channel estimation value of a narrowband signal, the precision of performing parameter estimation according to the channel estimation value of the broadband signal is higher and the effect thereof is better.

Description

Channel estimation method, device and system for frequency hopping signals Technical field

The present application relates to the field of communications technologies, and in particular, to a channel estimation method, apparatus, and system for frequency hopping signals.

Background technique

Frequency hopping is a commonly used spread spectrum method in wireless communication systems. In a frequency hopping communication system, the carrier frequency of the signal transmitted by both parties of the communication will be hopped according to a predetermined frequency hopping pattern within a wide frequency band. Therefore, the frequency hopping signal has good anti-interference ability. After receiving the frequency hopping signal, the receiving end device needs to perform channel estimation according to the frequency hopping signal to obtain a channel estimation value, so as to accurately recover the signal sent by the transmitting end device according to the channel estimation value.

In the related art, the channel estimation value can be used for parameter estimation in addition to recovering the transmission signal. For example, in a mobile terminal positioning scenario, the base station may perform channel estimation according to an uplink frequency hopping signal sent by the mobile terminal, obtain a channel estimation value, and then, according to the channel estimation value, a time of arrival (TOA) or a time difference of arrival (Time). Difference Of Arrival (TDOA) and other positioning parameters are used for parameter estimation, and then the specific orientation of the mobile terminal can be determined according to the estimated positioning parameters.

However, since the frequency band corresponding to each hopping time slot in the frequency hopping signal is narrow, the accuracy of parameter estimation after the channel estimation is performed according to the narrowband signal is low.

Summary of the invention

In order to solve the problem that the channel estimation according to the narrowband frequency hopping signal in the related art is performed, and the accuracy of the parameter estimation is low, the present application provides a channel estimation method, device and system for frequency hopping signals. The technical solution is as follows:

In a first aspect, a channel estimation method for a frequency hopping signal is provided. The method may include: when a receiving end device receives a channel estimation request, acquiring frequency hopping of the received n frequency hopping time slots in a preset time period. a signal, the frequency bands corresponding to the frequency hopping signals of the n frequency hopping time slots are consecutive, and the n is an integer greater than 1; then the receiving end device can perform frequency hopping signals on the frequency hopping time slots of the n frequency hopping time slots. The frequency hopping signal of the slot performs channel estimation, and obtains n channel estimation values, wherein each channel estimation value corresponds to one frequency band; further, the receiving end device can eliminate two channel estimations of the frequency band adjacent to the n channel estimation values. The amplitude difference and phase difference of the values result in updated n channel estimation values, and the amplitude and phase of the updated n channel estimation values are continuous.

In the method shown in the present application, since the updated total frequency band corresponding to the n channel estimation values is wider, and the amplitude and phase of the updated n channel estimation values are continuous, the updated n channel estimates are performed. The value is equivalent to the channel estimation value of a wideband signal, and the accuracy of the parameter estimation according to the channel estimation value of the wideband signal is higher and the effect is better than the channel estimation value of the narrowband signal.

Optionally, the process for the receiving end device to cancel the amplitude difference and the phase difference between the two channel estimation values of the two channel estimation values may include:

Obtaining, from the n channel estimation values, a first channel estimation value and a second channel estimation value adjacent to the frequency band;

When the frequency band corresponding to the first channel estimation value and the second channel estimation value has an overlapping frequency band, the receiving end device may And extracting, by the first channel estimation value, a first target reference value corresponding to the overlapping frequency band, and extracting, from the second channel estimation value, a second target reference value corresponding to the overlapping frequency band.

When the frequency band corresponding to the first channel estimation value and the second channel estimation value does not have an overlapping frequency band, on the one hand, the receiving end device may perform extrapolation interpolation processing on the first channel estimation value in the frequency domain to obtain the first a reference value, the frequency band corresponding to the second channel estimation value has an overlapping frequency band; and then the receiving end device may extract, from the first reference value, a first target reference value corresponding to the overlapping frequency band, and A second target reference value corresponding to the overlapping frequency band is extracted from the second channel estimation value.

When the frequency band corresponding to the first channel estimation value and the second channel estimation value does not have an overlapping frequency band, on the other hand, the receiving end device may further perform extrapolation interpolation processing on the first channel estimation value in the frequency domain, to obtain a first reference value, and performing extrapolation interpolation processing on the second channel estimation value in the frequency domain to obtain a second reference value, where the frequency band corresponding to the second reference value has an overlapping frequency band; A first target reference value corresponding to the overlapping frequency band is extracted from the reference value, and a second target reference value corresponding to the overlapping frequency band is extracted from the second reference value.

After obtaining the first target reference value and the second target reference value by using the foregoing method, the receiving end device may determine a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value, and then according to the The amplitude difference between the first target reference value and the second target reference value compensates for the amplitude of the channel estimation value to be compensated; and the channel to be compensated is estimated according to the phase difference between the first channel estimation value and the second channel estimation value The phase of the value is compensated. The amplitude difference and the phase difference of the two channel estimation values are eliminated, so that the amplitude and phase of the adjacent channel estimation values of the two frequency bands are also continuous.

Optionally, the receiving device performs extrapolation and interpolation processing on the first channel estimation value in the frequency domain, and the process of obtaining the first reference value may include: constructing, according to the first channel estimation value S, a channel estimation value H of the extended frequency band. When the upper limit frequency of the first frequency band corresponding to the first channel estimation value is equal to the lower limit frequency of the second frequency band corresponding to the second channel estimation value, the lower limit frequency of the extended frequency band is equal to the upper limit frequency of the first frequency band, And the upper limit frequency of the extended frequency band is located in the second frequency band, and the channel estimation value H of the extended frequency band satisfies:

When the lower limit frequency of the first frequency band is equal to the upper limit frequency of the second frequency band, the upper limit frequency of the extended frequency band is equal to the lower limit frequency of the first frequency band, and the lower limit frequency of the extended frequency band is located in the second frequency band, The channel estimate H of the extended band satisfies:

Where N is the total number of points of the channel estimation value H of the extended frequency band constructed, H(k) is an estimated value of the jth point in the channel estimation value H of the extended frequency band, and M is the first channel estimation value S The total number of points, S(j) is the estimated value of the jth point in the first channel estimation value S, w is a preset M×M weight matrix, and w(k, j) is the weight matrix The weight of the jth column of k rows, N is a positive integer, and M is greater than or equal to N.

Further, the receiving end device may determine the first channel estimation value and the channel estimation value of the extended frequency band as the first reference value, where the frequency band corresponding to the first reference value includes the first frequency band and the extended frequency band.

Optionally, the channel estimation method of the frequency hopping signal can be applied to the location scenario of the mobile terminal, so the channel estimation request can be a location request sent by the mobile terminal, and correspondingly, the n devices acquired by the receiver device The frequency hopping signal of the frequency hopping time slot is the frequency hopping signal of the n frequency hopping time slots transmitted by the mobile terminal. Further, after obtaining the updated n channel estimation values, the receiving end device may further determine the updated n channel estimation values. The bit parameter is estimated to obtain a positioning parameter, and the positioning parameter may include at least one of an arrival time and an arrival time difference.

Since the updated n channel estimation values are equivalent to channel estimation values of a wideband signal, the estimation accuracy of the positioning parameter estimation according to the channel estimation value of the wideband signal is higher than the channel estimation value of the narrowband signal. Therefore, the positioning accuracy of the mobile terminal is effectively improved.

Optionally, before receiving the positioning request, the receiving end device may detect whether the moving speed of the mobile terminal is less than a preset before acquiring the frequency hopping signals of the n frequency hopping time slots received in the preset time period. a speed threshold; when the moving speed of the mobile terminal is less than the preset speed threshold, the receiving end device may determine that the amplitude, phase, and channel delay of the uplink frequency hopping signal sent by the mobile terminal are relatively stable, and therefore may move to the mobile terminal. The terminal sends the indication information, where the indication information includes a target hopping pattern, the indication information is used to indicate that the mobile terminal sends the frequency hopping signal according to the target hopping pattern, and the target hopping pattern occupies the entire system bandwidth, and the two adjacent The frequency bands corresponding to the hopping time slots are adjacent.

The target frequency hopping pattern fills the entire system bandwidth, and the frequency bands corresponding to two adjacent hopping time slots are adjacent. Therefore, it is ensured that the amplitude and phase of the frequency hopping signals of the adjacent frequency bands are relatively stable, that is, the amplitude difference and the phase difference of the two channel estimation values of the adjacent frequency bands can be effectively reduced. Further, since the target hopping pattern fills the entire system bandwidth, after processing the channel estimation values of the hopping signals of the n slots, the bandwidth corresponding to the updated n channel estimation values is obtained. For this system bandwidth, the accuracy of channel estimation and parameter estimation is improved.

Optionally, the frequency hopping signal of the n frequency hopping time slots received by the receiving end device may include a K channel frequency hopping signal received by the K antennas, where each hopping frequency signal includes n frequency hopping time slots. A frequency hopping signal, the K being an integer greater than one. At this time, the receiving end device may separately perform channel estimation on each of the hopping signals of the K-channel frequency hopping signals to obtain K-group channel estimation values; and then, for each group of channel estimation values in the K-group channel estimation values, The amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values of each set of channel estimation values are eliminated, and the updated channel estimation value of the K group is obtained; after the K group is updated, Each group of updated channel estimation values in the channel estimation value respectively performs positioning parameter estimation to obtain K positioning sub-parameters; finally, the K positioning sub-parameters are weighted and averaged to obtain the positioning parameters.

The receiving end device performs weighted averaging on the K positioning sub-parameters, and the process of obtaining the positioning parameter may include: calculating a statistical parameter of the K positioning sub-parameters, where the statistical parameter includes an average value, a median, and a maximum At least one of a value and a minimum value; then determining the positioning parameter according to the K positioning sub-parameters and the statistical parameter, the positioning parameter T satisfies:

Where σ(i) is the preset weight value of the i-th antenna, t(i) is the i-th positioning sub-parameter, L is the number of statistical parameters, and α(j) is the preset of the j-th statistical parameter. The weight value, s(j) is the jth statistical parameter.

Since the finally obtained positioning parameter comprehensively considers the positioning sub-parameter determined according to the frequency hopping signal received by each antenna, and the statistical information of each positioning sub-parameter, the reliability of the finally determined positioning parameter is higher, and can further Improve the positioning accuracy of mobile terminals.

In a second aspect, a channel estimation apparatus for a frequency hopping signal is provided, and the apparatus may include at least one module for implementing a channel estimation method of the frequency hopping signal provided by the above first aspect.

In a third aspect, a channel estimation apparatus for a frequency hopping signal is provided, the apparatus comprising: a processor, a transmitter, and a connection The processor is used to implement the channel estimation method of the frequency hopping signal provided by the above first aspect.

In a fourth aspect, a computer readable storage medium is provided, the computer readable storage medium storing instructions for causing a computer to perform frequency hopping provided by the first aspect when the computer readable storage medium is run on a computer Channel estimation method for signals.

In a fifth aspect, a computer program product comprising instructions for causing a computer to perform a channel estimation method of a frequency hopping signal provided by the first aspect described above is provided when the computer program product is run on a computer.

In a sixth aspect, a channel estimation system for a frequency hopping signal is provided, the system may include: a transmitting end device and a receiving end device, where the receiving end device may include the frequency hopping signal provided by the second aspect or the third aspect Channel estimation device.

The technical effects obtained by the above second to sixth aspects are similar to those obtained by the corresponding technical means in the first aspect, and are not described herein again.

In summary, the present application provides a channel estimation method, apparatus, and system for a frequency hopping signal. When a receiving end device receives a channel estimation request, it may perform a frequency hopping signal on the received n frequency hopping time slots. The frequency hopping signal of each frequency hopping time slot is subjected to channel estimation to obtain n channel estimation values, wherein the frequency bands corresponding to the n frequency hopping time slots are continuous. Then, the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values are eliminated, and the updated n channel estimation values are obtained. Since the amplitude and phase of the updated n channel estimation values are continuous, the updated n channel estimation values are equivalent to channel estimation values of a wideband signal, and the bandwidth is compared according to the channel estimation value of the narrowband signal. The channel estimation value of the signal is more accurate and better when the parameters are estimated.

DRAWINGS

1 is a schematic structural diagram of a frequency hopping communication system according to an embodiment of the present invention;

2 is a schematic diagram of a frequency hopping pattern provided by an embodiment of the present invention;

FIG. 3 is a schematic diagram of a mobile terminal positioning system according to an embodiment of the present invention; FIG.

4 is a schematic structural diagram of a channel estimation apparatus for a frequency hopping signal according to an embodiment of the present invention;

FIG. 5 is a flowchart of a channel estimation method for a frequency hopping signal according to an embodiment of the present invention; FIG.

FIG. 6 is a schematic diagram of another frequency hopping pattern according to an embodiment of the present invention; FIG.

7 is a flowchart of a method for a receiving end device to cancel an amplitude difference and a phase difference between two channel estimation values adjacent to a frequency band according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of still another frequency hopping pattern according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of an extended frequency band according to an embodiment of the present invention; FIG.

FIG. 10 is a schematic diagram of another extended frequency band according to an embodiment of the present invention; FIG.

11 is a schematic diagram of a frequency band corresponding to an updated n channel estimation values according to an embodiment of the present invention;

FIG. 12 is a schematic diagram of a target frequency hopping pattern according to an embodiment of the present invention; FIG.

FIG. 13 is a schematic structural diagram of another channel estimation apparatus for a frequency hopping signal according to an embodiment of the present invention; FIG.

FIG. 14 is a schematic structural diagram of a processing module according to an embodiment of the present invention.

detailed description

In order to make the objects, technical solutions and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

1 is a schematic structural diagram of a frequency hopping communication system according to an embodiment of the present invention. As shown in FIG. 1, the system may include a transmitting end device and a receiving end device, where the transmitting end device may be a mobile terminal 00, and receive The end device may be the access network device 01; or the sender device may be the access network device 01, and correspondingly, the receiving device may be the mobile terminal 00. The transmitting end device and the receiving end device can communicate by using a frequency hopping signal. The frequency hopping communication system may be a system of different standards. Correspondingly, the access network device 01 may also be a different device. For example, the access network device 01 may be an evolved base station (Evolved Node B, eNodB), a base station controller (BSC), or a radio network controller (RNC).

The frequency hopping pattern of the frequency hopping signal exchanged between the transmitting end device and the receiving end device may be as shown in FIG. 2 . In Fig. 2, the horizontal axis t is time and the vertical axis f is frequency. As can be seen from Figure 2, the carrier frequency of the signals transmitted and received by both parties of the communication is constantly changing over time. For example, in the t0 to t1 time slot, the carrier frequency band of the signal is f0 to f1, and in the t1 to t2 time slot, the carrier frequency band of the signal jumps to f2 to f3. The bandwidth of the frequency band corresponding to each hopping time slot (also referred to as the frequency hopping channel width) is generally the same, that is, f3-f2=f1-f0. After receiving the frequency hopping signal, the receiving end device in the communication side needs to perform channel estimation on the frequency hopping signal of each hopping time slot to obtain the channel estimation value in order to resist the channel fading.

Further, FIG. 3 is a schematic diagram of a mobile terminal positioning system according to an embodiment of the present invention. Referring to FIG. 3, the positioning system may include multiple access network devices 01, and each access network device 01 is After the channel estimation is performed on the received frequency hopping signal, the channel estimation value is obtained, and the positioning parameter of the TOA or the TDOA is estimated according to the channel estimation value, and the estimated positioning parameter is reported to the positioning center 02. The positioning center 02 can calculate the specific orientation of the mobile terminal 00 according to the positioning parameters reported by the multiple access network devices 01. The accuracy of the positioning parameter estimation of the access network device directly affects the accuracy of positioning the mobile terminal, and the accuracy of the positioning parameter estimation is positively correlated with the bandwidth of the channel estimation value, that is, the larger the bandwidth, the accuracy of the positioning parameter estimation. The higher.

Please refer to FIG. 4, which is a schematic structural diagram of a channel estimating apparatus for a frequency hopping signal according to an exemplary embodiment of the present application. The device may be configured in the mobile terminal 00 or the access network device 01 shown in FIG. 1 or in any of the access network devices 01 in the positioning system shown in FIG. 3. As shown in FIG. 4, the apparatus may include a transmitter 011, a receiver 012, and a processor 013. The processor 013 can be used to perform a channel estimation method for the frequency hopping signal shown in FIG. 5 below.

FIG. 5 is a flowchart of a channel estimation method for a frequency hopping signal according to an embodiment of the present invention. The method may be applied to the mobile terminal 00 or the access network device 01 shown in FIG. In any of the access network devices 01 of the positioning system shown in FIG. 3, referring to FIG. 5, the method may specifically include:

Step 101: When the receiving end device receives the channel estimation request, acquire the frequency hopping signals of the n hopping time slots received in the preset time period.

In an embodiment of the present invention, the channel estimation request may be generated after the receiving device receives the frequency hopping signal, or may be sent by the sending device, for example, may be a positioning request sent by the mobile terminal. The receiving device can And acquiring, in the preset time period after receiving the channel estimation request, the frequency hopping signals of the n frequency hopping slots, where n is an integer greater than 1, that is, when the receiving end device can acquire at least two frequency hopping frequencies. Frequency hopping signal. The frequency hopping signal of each frequency hopping time slot corresponds to one frequency band, and the frequency bands corresponding to the frequency hopping signals of the n frequency hopping time slots acquired by the receiving end device should be continuous.

In order to maximize the accuracy of the channel estimation, the preset time period may be the time required for the frequency hopping signal to traverse the entire system bandwidth (ie, the total frequency bandwidth of the frequency hopping communication system). For example, assuming that the system bandwidth of the frequency hopping system is 1 megahertz (MHz) and the frequency hopping channel width is 25 kilohertz (kHz), the frequency hopping signal must be hopped at least 40 times to full the entire system bandwidth. If the frequency hopping frequency of the frequency hopping signal is 100 hops/second, it can be determined that the minimum time required for the frequency hopping signal to jump to the system bandwidth is 0.5 seconds, so the preset time period set by the receiving device can be 0.5 seconds. Therefore, the receiving end device can receive the frequency hopping signals of the 40 frequency hopping time slots sent by the transmitting end device within 0.5 seconds after receiving the channel estimation request.

For example, if the access network device 01 receives the positioning request sent by the mobile terminal 00 in the positioning system shown in FIG. 3, the access network device 01 can acquire the preset time period after receiving the positioning request. The hopping pattern of the obtained uplink hopping signal can be as shown in FIG. 2. As can be seen from FIG. 2, the access network device 01 obtains 4 hops. The frequency hopping frequency hopping signal, and the frequency bands corresponding to the frequency hopping signals of the four frequency hopping time slots are continuous, and the four frequency bands are: f0 to f1, f1 to f2, f2 to f3, and f3 to f4.

It should be noted that, in a practical application, the hopping pattern of the frequency hopping signal is pre-stored in the receiving device, and the receiving device may determine the preset time period for acquiring the hopping signal according to the hopping pattern. The frequency bands corresponding to the frequency hopping signals of the n frequency hopping time slots received in the preset time period are consecutive, and the frequency bands corresponding to the n frequency hopping signals are different. For example, it is assumed that the frequency hopping pattern of the frequency hopping signal is as shown in FIG. 6, wherein the frequency band corresponding to the frequency hopping signal of the fifth frequency hopping time slot is the same as the frequency hopping signal of the third frequency hopping time slot. The receiving end device can determine that the channel estimation or the parameter estimation only needs to acquire the frequency hopping signals of the first four hopping time slots according to the hopping pattern.

Step 102: The receiving end device performs channel estimation on the frequency hopping signal of each of the hopping time slots in the frequency hopping signals of the n frequency hopping time slots received in the preset time period, to obtain n channel estimation values.

Further, the receiving end device may perform channel estimation on the frequency hopping signal of each frequency hopping time slot according to a preset channel estimation algorithm, and obtain a channel estimation value of the frequency hopping signal of each frequency hopping time slot. Since each frequency hopping time slot corresponds to one frequency band, correspondingly, the channel estimation value of the frequency hopping signal of each frequency hopping time slot also corresponds to one frequency band. The channel estimation algorithm may be an estimation algorithm based on a reference signal, or may be a blind estimation algorithm or a semi-blind estimation algorithm, which is not limited in this application.

It should be noted that, before the channel estimation is performed, the receiving end device needs to first sample the frequency hopping signal of each frequency hopping time slot according to a preset sampling interval in the frequency domain to obtain frequency hopping of multiple sampling frequency points. signal. Then, channel estimation is performed on the frequency hopping signals of the plurality of sampling frequency points, and channel estimation values of the frequency hopping signals of each frequency hopping time slot are obtained, so that the channel estimation value of the frequency hopping signal of each frequency hopping time slot can be An estimate of a plurality of points is included, wherein the estimated value of each point corresponds to one sample frequency point.

For example, if the access network device 01 receives the hopping pattern of the uplink frequency hopping signal sent by the mobile terminal within the preset time period, as shown in FIG. 2, the access network device 01 can respectively pair t0- The frequency hopping signals of 4 hopping slots of t1 to t3-t4 are subjected to channel estimation, and four channel estimation values S1 to S4 are obtained. Each of the channel estimates may include an estimate of a plurality of points. For example, the frequency band corresponding to the frequency hopping signal of the fourth frequency hopping time slot t3 to t4 is f3 to f4, and the access network device samples the frequency hopping signal of the f3 to f4 frequency band, and obtains M=50 sampling frequencies. Point hopping signal. Therefore After the network access device performs channel estimation on the frequency hopping signals of the 50 sampling frequency points, the obtained channel estimation value S4 corresponding to the frequency hopping time slots t3 to t4 also includes an estimated value of 50 points, wherein the estimated value of each point is Corresponds to a sampling frequency point.

Step 103: Eliminate the amplitude difference and the phase difference between the two channel estimation values of the n channel estimation values, and obtain the updated n channel estimation values.

In an embodiment of the present invention, the receiving end device may sequentially acquire two channel estimation values of the adjacent frequency band starting from the lowest frequency band or the highest frequency band, and sequentially cancel the amplitude difference and the phase difference of the two channel estimation values. Finally, updated n channel estimation values whose amplitude and phase are consecutive are obtained. Since the frequency band width corresponding to the updated n channel estimation values is the sum of the bandwidths corresponding to the original channel estimation values, the updated n channel estimation values are equivalent to channel estimation values of a wideband signal. Compared with the channel estimation value of the narrowband signal, the accuracy of the parameter estimation according to the channel estimation value of the wideband signal is higher and the effect is better.

FIG. 7 is a flowchart of a method for a receiver device to cancel an amplitude difference and a phase difference between two channel estimation values adjacent to a frequency band according to an embodiment of the present disclosure. Referring to FIG. 7, the method may specifically include:

Step 1031: Acquire, from the n channel estimation values, a first channel estimation value and a second channel estimation value that are adjacent to the frequency band.

In an embodiment of the present invention, the receiving end device may sequentially detect a frequency band corresponding to each channel estimation value, and obtain, from the n channel estimation values, a first channel estimation value and a second channel estimation value adjacent to the frequency band. . If the channel estimation values adjacent to the frequency band corresponding to the first channel estimation value include multiple, the receiving end device may select, as the second channel estimation, a channel estimation value that is the closest to the first channel estimation value of the frequency hopping time slot. Value to ensure that the amplitude difference and phase difference of the two channel estimates are small.

For example, referring to the hopping pattern shown in FIG. 2, the frequency band corresponding to the channel estimation value S1 of the first hopping time slot is f0 to f1, and the channel estimation value S3 of the third hopping time slot corresponds to The frequency bands are f1 to f2, and the two frequency bands are adjacent. Therefore, the access network device 01 can select the channel estimation value S1 of the first hopping time slot as the first channel estimation value, and use the channel estimation value S3 of the third hopping time slot as the second channel estimation value.

Step 1032: Detect whether there is an overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value.

When the frequency band corresponding to the first channel estimation value and the second channel estimation value has an overlapping frequency band, step 1033 is performed; when the frequency band corresponding to the first channel estimation value and the second channel estimation value does not have an overlapping frequency band, perform Step 1034 or step 1036.

In an embodiment of the present invention, the frequency hopping pattern of the frequency hopping signal transmitted by the signal transceiving unit may include two types: the patterns overlap and the patterns are non-overlapping. In the frequency hopping signal in which the patterns are not overlapped, the upper limit frequency of one of the adjacent two frequency bands is equal to the lower limit frequency of the other frequency band. For example, in FIG. 2, the upper limit frequency of the frequency bands f0 to f1 is equal to the lower limit frequency of the frequency bands f1 to f2; in the frequency hopping signals with overlapping patterns, the upper limit frequency of the first frequency band of the adjacent two frequency bands is greater than the lower limit of the second frequency band. The frequency is less than the upper limit frequency of the second frequency band. FIG. 8 is a schematic diagram of still another frequency hopping pattern according to an embodiment of the present invention. Referring to FIG. 8 , in a frequency hopping signal with overlapping patterns, a first frequency hopping time slot corresponds to a third frequency hopping time slot. The frequency bands overlap. The first frequency band corresponding to the first frequency hopping time slot is f0 to f1′, and the frequency band corresponding to the third frequency hopping time slot is f1 to f2′, where f1<f1′<f2′, the two phases The overlapping frequency bands of the adjacent frequency bands are: f1 to f1'.

It should be noted that, in practical applications, since the frequency hopping pattern adopted by the communication parties is generally pre-agreed, the receiving end device can quickly determine whether the adjacent frequency band in the frequency hopping signal has a frequency hopping pattern according to the agreed frequency hopping pattern. The overlapping, and thus the method of processing the channel estimation values of the adjacent frequency bands, can be quickly determined.

Step 1033: Extract, from the first channel estimation value, a first target reference value corresponding to the overlapping frequency band, and A second target reference value corresponding to the overlapping frequency band is extracted from the second channel estimation value. Go to step 1038.

When the frequency band corresponding to the first channel estimation value and the second channel estimation value has an overlapping frequency band, the receiving end device may directly extract the first target reference value corresponding to the overlapping frequency band from the first channel estimation value, and A second target reference value corresponding to the overlapping frequency band is extracted from the second channel estimation value. In an embodiment of the present invention, since each channel estimation value includes an estimated value corresponding to a plurality of sampling frequency points, the receiving end device may first determine sampling frequency points of the overlapping frequency band, and then separately from the two channels. An estimated value corresponding to the sampling frequency point of the overlapping frequency band is extracted as the first reference value and the second reference value.

For example, assume that the first channel estimate is the channel estimate S1 of the first hop slot and the second channel estimate is the channel estimate S3 of the third hop slot. The first channel estimation value S1 and the second channel estimation value S3 respectively include an estimated value of 60 points, and the estimated value of each point in the first channel estimation value S1 is respectively compared with one of the frequency bands f0 to f1'. The frequency points correspond; the estimated values of each point in the second channel estimation value S3 correspond to one of the frequency bands f1 to f2', respectively. The access network device may first determine that there are overlapping frequency bands in the frequency bands corresponding to the two channel estimation values: f1 to f1′, and further, may determine the sampling frequency points included in the overlapping frequency bands f1 to f1′. If the overlapping frequency bands f1 to f1' include 5 sampling frequency points, the access network device may extract corresponding to the 5 sampling frequency points from the estimated values of 60 points of the first channel estimation value S1. The estimated value is used as the first target reference value, and the estimated value corresponding to the five sampling frequency points is extracted as the second target reference value from the estimated values of the 60 points of the second channel estimation value S3.

In addition, since the sampling interval when the access network device samples the frequency hopping signals of the respective frequency bands is fixed, the access network device may also directly obtain the estimated value of 60 points of the first channel estimation value S1. The estimated values of the last five points are extracted as the first target reference value, and the estimated values of the first five points are extracted from the estimated values of the 60 points of the second channel estimated value S3 as the second target reference value.

Step 1034: Perform extrapolation interpolation processing on the first channel estimation value in the frequency domain to obtain a first reference value. Go to step 1035.

In an embodiment of the present invention, when there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value, as a first optional implementation manner, the receiving end device may The first channel estimation value of the channel estimation values is extrapolated and interpolated in the frequency domain to extend the frequency band range corresponding to the first channel estimation value, so that the first channel estimation value after the frequency band range is extended (ie, the first reference) Value) There is an overlapping frequency band in the frequency band corresponding to the second channel estimation value. Then, the receiving end device can extract the first target reference value and the second target reference value corresponding to the overlapping frequency bands from the first reference value and the second channel estimation value, respectively.

Specifically, the receiving end device may first construct a channel estimation value H of the extended frequency band according to the first channel estimation value S, where the extended frequency band overlaps with the frequency band corresponding to the second channel estimation value.

In one aspect, when the upper limit frequency of the first frequency band corresponding to the first channel estimation value is equal to the lower limit frequency of the second frequency band corresponding to the second channel estimation value, the lower limit frequency of the extended frequency band may be the upper limit of the first frequency band. The frequencies are equal, and the upper limit frequency of the extended band is located in the second frequency band. At this time, the channel estimation value H of the extended frequency band satisfies:

On the other hand, when the lower limit frequency of the first frequency band is equal to the upper limit frequency of the second frequency band, the upper limit frequency of the extended frequency band is equal to the lower limit frequency of the first frequency band, and the lower limit frequency of the extended frequency band is located in the second Within the band. At this time, the channel estimation value H of the extended frequency band satisfies:

Where N is the total number of points of the channel estimation value H of the extended frequency band, and the total number of points N is determined by a preset sampling interval Δf and a bandwidth F of the extended frequency band, and the total number of points of the channel estimation value H is N Satisfy:

H(k) is an estimated value of the jth point in the channel estimation value H of the extended frequency band, M is the total number of points of the first channel estimation value S, and S(j) is the jth of the first channel estimation value S The estimated value of the point, w is the preset weight matrix of M×M, w(k,j) is the weight of the kth row and the jth column in the weight matrix, N is a positive integer, and M is greater than or Equal to N.

It can be seen from the above formula (1) and formula (2) that the estimated value of each point in the channel estimation value H of the extended frequency band is the weighting of the estimated values of the N points in the first channel estimation value S. After getting it.

Further, the receiving end device may determine the first channel estimation value S and the channel estimation value H of the constructed extended frequency band as the first reference value, where the first reference value includes an estimate of M+N points. And the frequency band corresponding to the first reference value includes the first frequency band and the extended frequency band.

For example, as shown in FIG. 2, the first frequency band corresponding to the first channel estimation value S1 is f0 to f1, and the second frequency band corresponding to the second channel estimation value S3 is f1 to f2. Since the two frequency bands do not overlap, and the upper limit frequency f1 of the first frequency band is equal to the lower limit frequency of the second frequency band, the access network device can construct the extended frequency band from the first channel estimation value S1 to Channel estimation value H1 of f1'. FIG. 9 is a schematic diagram of an extended frequency band according to an embodiment of the present invention. As shown in FIG. 9, the lower limit frequency of the extended frequency band 10 may be equal to the upper limit frequency f1 of the first frequency band, and the upper limit of the extended frequency band 10 The frequency f1' satisfies: f1 < f1 ' < f2. Further, the access network device may construct the channel estimation value H1 of the extended frequency band 10 according to the above formula (1). Assuming that the number of sampling frequency points included in the extended frequency band f1 to f1' is N=5, and the total number of points of the first channel estimation value S1 is M=50, the channel estimation value H1 of the extended frequency band f1 to f1' satisfies:

It can be seen from the formula (3) that the channel estimation value H1 of the extended frequency band f1 to f1' includes an estimated value of 5 points, wherein the estimated value of each point is the last 5 points in the first channel estimation value S1. The estimated values (ie, 46th to 50th points) are weighted. The estimated value of 50 points in the first channel estimation value S1 and the estimated value of 5 points in the channel estimation value H1 of the extended frequency band constitute the first reference value.

Step 1035: Extract a first target reference value corresponding to the overlapping frequency band from the first reference value, and extract a second target reference value corresponding to the overlapping frequency band from the second channel estimation value. Go to step 1038.

For example, the access network device may extract a first target reference value corresponding to the overlapping frequency bands f1 to f1′ from the first reference value, and extract corresponding overlapping frequency bands f1 to f1 from the second channel estimation value S3. 'The second target reference value. The first target reference value is the channel estimation value H1 of the extended frequency band f1 to f1', and the second target reference value may be an estimated value of the first five points in the second channel estimation value S3.

Step 1036: Perform extrapolation interpolation processing on the first channel estimation value in the frequency domain to obtain a first reference value, and perform extrapolation interpolation processing on the second channel estimation value in the frequency domain to obtain a second reference value. Go to step 1037.

When the first frequency band corresponding to the first channel estimation value and the second frequency band corresponding to the second channel estimation value do not have an overlapping frequency band, as a second optional implementation manner, the receiving end device may further The channel estimation values are respectively subjected to extrapolation interpolation processing in the frequency domain to obtain the first reference value and the second reference value. The frequency band corresponding to the second reference value has an overlapping frequency band, and the upper limit frequency of the overlapping frequency band is located in the first frequency band, and the lower limit frequency of the overlapping frequency band is located in the second frequency band.

For example, FIG. 10 is a schematic diagram of another extended frequency band provided by an embodiment of the present invention, as shown in FIG. The access network device may refer to the above formula (1), construct a channel estimation value H1 of the extended frequency band 10 according to the first channel estimation value S1, and further obtain a first reference value of the frequency range f0 to f1'; meanwhile, the receiving The terminal device may refer to the above formula (2), and construct a channel estimation value H2 of the extended frequency band 20 according to the second channel estimation value S3, thereby obtaining a second reference value of the frequency range f0' to f2. As can be seen from FIG. 10, the frequency band corresponding to the second reference value and the second reference value have overlapping frequency bands: f0' to f1'.

Step 1037: Extract a first target reference value corresponding to the overlapping frequency band from the first reference value, and extract a second target reference value corresponding to the overlapping frequency band from the second reference value. Go to step 1038.

For example, the access network device may extract a first target reference value corresponding to the overlapping frequency bands f0' to f1' from the first reference value, and extract corresponding overlapping frequency bands f0' to f1 from the second reference value. 'The second target reference value. Assuming that the extended frequency bands f0' to f1, and f1 to f1' respectively include five sampling frequency points, the first target reference value may include an estimated value of the last five points in the first channel estimation value S1, and the extension. An estimated value of 5 points in the channel estimation value H1 of the frequency band 10; the second target reference value may include an estimated value of 5 points in the channel estimation value H2 of the extended frequency band 20, and the second channel estimation value S3 Estimated value of 5 points.

Step 1038: Determine a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value. Step 1039 and step 1040 are performed.

In an embodiment of the present invention, the receiving end device may randomly determine a channel estimation value from the first channel estimation value and the second channel estimation value as the to-be-compensated channel estimation value.

Step 1039: Compensate for the amplitude of the channel estimation value to be compensated according to the amplitude difference between the first target reference value and the second target reference value.

Step 1040: Compensate the phase of the channel estimation value to be compensated according to the phase difference between the first target reference value and the second target reference value.

After the receiving end device determines the first target reference value and the second target reference value of the corresponding overlapping frequency band according to the above steps, the amplitude and phase of each target reference value may be separately calculated, and then the amplitudes of the two target reference values are determined. Difference and phase difference. Since each target reference value may include an estimated value of a plurality of points, the receiving end device may separately calculate an amplitude difference and a phase difference of the estimated values of each point, and respectively calculate an average value of the amplitude differences of the plurality of points. And the average of the phase differences of the plurality of points. Finally, the receiving end device can compensate the amplitude of the compensated channel estimation value according to the average value of the amplitude differences of the plurality of points, and perform the phase of the compensated channel estimation value according to the average value of the phase differences of the multiple points. The compensation is such that the compensated first channel estimate is continuous with the amplitude of the second channel estimate, and the phase is also continuous. The amplitude difference ΔS between the first target reference value and the second target reference value may be expressed as:

ΔS(j)=|S1'(j)|-|S2'(j)|, j=1,...,J;

The phase difference Δφ between the first target reference value and the second target reference value may be expressed as:

Δφ(j)=φ[S1'(j)]-φ[S2'(j)], j=1,...,J;

Where J is the number of sampling frequency points in the overlapping frequency band, S1'(j) is an estimated value corresponding to the jth sampling frequency point in the first target reference value, and S2'(j) is the second target reference value Corresponding to the estimated value of the jth sampling frequency point, || indicates the magnitude of the data in the parentheses, and φ[] indicates the phase of the data in the parentheses.

For example, for the scenario in which the hopping patterns overlap, it is assumed that the upper limit frequency of the frequency band corresponding to the first channel estimation value is located in a frequency band corresponding to the second channel estimation value, and the access network device is configured according to the first target reference value and the second target reference value. The calculated amplitude difference ΔS includes amplitude differences of five sampling frequency points in the corresponding overlapping frequency bands f1 to f1', and the phase difference Δφ includes phase differences of five sampling frequency points in the overlapping overlapping frequency bands f1 to f1', then the connection The network access device can calculate the 5 sampling frequencies separately. The average of the amplitude difference of the points, and the average of the phase differences of the five sampling frequency points, and based on the average of the amplitude differences, the last point in the first channel estimation value (ie, the sampling frequency point corresponding to the upper limit frequency) The magnitude of the estimated value is compensated, and the phase of the estimated value of the last point in the first channel estimate is compensated based on the average of the phase differences.

For the scenario where the frequency hopping pattern has no overlap, it is assumed that the amplitude difference ΔS calculated by the access network device according to the first target reference value and the second target reference value includes the amplitudes of the 10 sampling frequency points in the corresponding overlapping frequency bands f0' to f1'. The difference, the phase difference Δφ includes the phase difference corresponding to the 10 sampling frequency points in the overlapping frequency bands f0' to f1'. The access network device may separately calculate an average value of amplitude differences of the 10 sampling frequency points, and an average value of phase differences of the 10 sampling frequency points, and estimate the second channel in the first channel estimation value. The magnitude and phase of the estimated values of adjacent sampled frequency points are compensated.

Further, the access network device 01 can continue to eliminate the amplitude difference and phase difference of the channel estimation values of the third hopping time slot and the second frequency hopping time slot, and then eliminate the second frequency hopping time slot and the fourth frequency hopping time slot. The amplitude difference and phase difference of the channel estimation values of the hopping time slots finally obtain 4 updated channel estimation values. Since the amplitude and phase of the four updated channel estimation values are continuous, as shown in FIG. 11, the updated four channel estimation values correspond to a channel estimation value corresponding to the frequency bands f0 to f4. Since the channel estimation value corresponds to a wide bandwidth, the accuracy of subsequent parameter estimation based on the channel estimation value can be effectively improved.

Step 104: Perform positioning parameter estimation on the updated n channel estimation values to obtain positioning parameters.

In an embodiment of the present invention, when the channel estimation request is a positioning request sent by the mobile terminal, the access network device may further follow a preset parameter estimation algorithm after obtaining the updated n channel estimation values. The positioning parameter estimation is performed on the updated n channel estimation values, and the positioning parameter may specifically include: at least one of an arrival time TOA and a TDOA. Alternatively, the access network device may also detect an Angle-of-Arrival (AOA) of the frequency hopping signal, and then perform joint estimation of the TOA and the AOA.

As an optional implementation manner of the present application, the frequency hopping signal received by the access network device may include a K-channel frequency hopping signal received through K antennas, where K is an integer greater than 1, wherein each hopping The frequency signals may each comprise a frequency hopping signal of n frequency hopping time slots.

Therefore, in the foregoing step 102, when the access network device performs channel estimation on the received frequency hopping signal, channel estimation may be separately performed on each of the hopping signals of the K-channel frequency hopping signal, thereby obtaining K. A group channel estimate, wherein each channel estimate includes n channel estimates.

Further, in the foregoing step 103, the access network device may estimate each set of channel values in the K group channel estimation value, and eliminate two adjacent channel estimation values of the channel estimation value of each group. The amplitude difference and phase difference of the channel estimation values are obtained, and the updated channel estimation values of the K group are obtained. Each of the updated channel estimation values includes updated n channel estimation values.

Then, in the foregoing step 104, the access network device may perform positioning parameter estimation for each group of updated channel estimation values in the updated channel estimation value of the K group, and obtain K positioning sub-parameters, and then The K positioning sub-parameters are weighted and averaged to obtain the positioning parameters.

The access network device performs weighted averaging on the K positioning sub-parameters, and the process of obtaining the positioning parameter may include:

Step S1: Calculate statistical parameters of the K positioning sub-parameters.

The statistical parameter may include an average value of the K positioning sub-parameters, a median of the K positioning sub-parameters, a maximum value of the K positioning sub-parameters, and a minimum of the K positioning sub-parameters. At least one of them.

Step S2: Determine the positioning parameter according to the K positioning sub-parameters and the statistical parameter, where the positioning parameter T satisfies:

Where σ(i) is the preset weight value of the i-th antenna, t(i) is the i-th positioning sub-parameter, L is the number of statistical parameters, and α(j) is the preset of the j-th statistical parameter. The weight value, s(j) is the jth statistical parameter.

It is assumed that in the above step S1, the access network device calculates the average value, the median, the maximum value, and the minimum value of the K positioning sub-parameters, and the number L of the statistical parameters is 4.

According to the above formula (4), it can be seen that the positioning parameter T finally calculated by the access network device comprehensively considers the positioning sub-parameters obtained according to the signals received by the respective antennas, and the statistical information of each positioning sub-parameters, so The reliability of the positioning parameters determined by the above formula (4) is high.

It should be noted that, as another optional implementation manner of the present application, after receiving the positioning request sent by the mobile terminal, the access network device may first detect whether the moving speed of the mobile terminal is less than a preset. Speed threshold. For example, the access network device may parse the Doppler parameter of the mobile terminal from an uplink frequency hopping signal sent by the mobile terminal, and determine a moving speed of the mobile terminal according to the Doppler parameter.

When the moving speed of the mobile terminal is less than the preset speed threshold, the access network device may determine that the amplitude, phase, and channel delay of the uplink frequency hopping signal sent by the mobile terminal are relatively stable at this time. Therefore, in order to further locate the accuracy of the parameter estimation, the access network device may further send the indication information to the mobile terminal, where the indication information includes a target hopping pattern, where the indication information is used to indicate that the mobile terminal follows the target hopping pattern. The frequency hopping signal is transmitted, and the target hopping pattern occupies the entire system bandwidth, and the frequency bands corresponding to the two adjacent hopping time slots are adjacent.

For example, the target hopping pattern may be as shown in FIG. 12, because the frequency bands corresponding to two adjacent hopping time slots are adjacent in the target hopping pattern, for example, the first hopping time slot t0 in FIG. The frequency band corresponding to t1 is f0 to f1, and the frequency band corresponding to the second frequency hopping time slot t1 to t2 is f1 to f2, and the two frequency bands are continuous. The moving speed of the mobile terminal is slower. Therefore, when the mobile terminal sends the frequency hopping signal according to the target frequency hopping pattern, the amplitude and phase of the frequency hopping signal of the adjacent frequency band are relatively stable, that is, the mobile terminal can effectively reduce The amplitude difference and phase difference of the two channel estimates for adjacent bands. Further, since the target hopping pattern fills the entire system bandwidth, after processing the channel estimation values of the hopping signals of the n slots, the bandwidth corresponding to the updated n channel estimation values is obtained. For the system bandwidth, the accuracy of channel estimation and parameter estimation is effectively improved.

In summary, the present application provides a channel estimation method for a frequency hopping signal. When a receiving end device receives a channel estimation request, each of the hopping signals of the received n frequency hopping time slots may be hopped. The frequency hopping frequency hopping signal is subjected to channel estimation to obtain n channel estimation values. Then, the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values are eliminated, and the updated n channel estimation values are obtained, because the amplitude and the updated n channel estimation values are The phase is continuous, so the updated n channel estimation values are equivalent to channel estimation values of a wideband signal, and the accuracy of parameter estimation according to the channel estimation value of the wideband signal is higher than the channel estimation value of the narrowband signal. ,better result.

FIG. 13 is a schematic structural diagram of another channel estimation apparatus for a frequency hopping signal according to an embodiment of the present invention. Referring to FIG. 13, the apparatus may include:

The obtaining module 201 can be used to implement the method shown in step 101 in the embodiment shown in FIG. 5 above.

The first estimating module 202 can be used to implement the method shown in step 102 in the embodiment shown in FIG. 5 above.

The processing module 203 can be used to implement the method shown in step 103 in the embodiment shown in FIG. 5 above.

FIG. 14 is a schematic structural diagram of a processing module according to an embodiment of the present invention. Referring to FIG. 14, the processing module 203 may include:

The obtaining sub-module 2031 can be used to implement the method shown in step 1031 in the embodiment shown in FIG. 7 above.

The first extraction sub-module 2032 can be configured to implement the method shown in step 1033 in the embodiment shown in FIG. 7 when there is an overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value.

The determining sub-module 2033 can be used to implement the method shown in step 1038 of the embodiment shown in FIG.

The processing sub-module 2034 can be used to implement the method shown in step 1039 and step 1040 in the embodiment shown in FIG. 7 above.

The extrapolation sub-module 2035 can be used to implement the method shown in step 1034 in the embodiment shown in FIG. 7 when there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value.

The second extraction sub-module 2036 can be used to implement the method shown in step 1035 of the embodiment shown in FIG.

Alternatively, the extrapolation sub-module 2035 may be further configured to implement the method shown in step 1036 in the embodiment shown in FIG. 7 when there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value. Correspondingly, the second extraction sub-module 2036 can also be used to implement the method shown in step 1037 in the embodiment shown in FIG. 7 above.

Optionally, the extrapolation sub-module 2035 is specifically configured to:

Constructing, according to the first channel estimation value S, a channel estimation value H of the extended frequency band; when the upper limit frequency of the first frequency band corresponding to the first channel estimation value is equal to the lower limit frequency of the second frequency band corresponding to the second channel estimation value The lower limit frequency of the extended frequency band is equal to the upper limit frequency of the first frequency band, and the upper limit frequency of the extended frequency band is located in the second frequency band, and the channel estimation value H of the extended frequency band satisfies:

When the lower limit frequency of the first frequency band is equal to the upper limit frequency of the second frequency band, the upper limit frequency of the extended frequency band is equal to the lower limit frequency of the first frequency band, and the lower limit frequency of the extended frequency band is located in the second frequency band, The channel estimate H of the extended band satisfies:

Where N is the total number of points of the channel estimation value H of the extended frequency band constructed, H(k) is an estimated value of the jth point in the channel estimation value H of the extended frequency band, and M is the first channel estimation value S The total number of points, S(j) is the estimated value of the jth point in the first channel estimation value S, w is a preset M×M weight matrix, and w(k, j) is the weight matrix The weight of the jth column of k rows, N is a positive integer, and M is greater than or equal to N;

And determining the first reference value according to the first channel estimation value and the channel estimation value of the extended frequency band.

Optionally, the channel estimation request may be a location request sent by the mobile terminal, where the acquiring module 201 may be configured to: acquire a frequency hopping signal of the n frequency hopping time slots sent by the mobile terminal in a preset time period.

Referring to FIG. 13, the apparatus may further include:

The second estimation module 204 can be used to implement the method shown in step 104 in the embodiment shown in FIG. 5 above.

The detecting module 205 is configured to detect, when the positioning request is received, whether the moving speed of the mobile terminal is less than a preset speed threshold.

The sending module 206 is configured to: when the moving speed of the mobile terminal is less than the preset speed threshold, send the indication information to the mobile terminal, where the indication information includes a target hopping pattern, where the indication information is used to indicate that the mobile terminal follows the The target hopping pattern transmits a frequency hopping signal, the target hopping pattern occupies the entire system bandwidth, and the adjacent two hopping time slots correspond to The bands are adjacent.

Optionally, the frequency hopping signal comprises a K-way frequency hopping signal received by K antennas, where K is an integer greater than 1, wherein each hopping frequency signal comprises a frequency hopping signal of n frequency hopping time slots. The first estimation module 202 is specifically configured to: perform channel estimation on each of the hopping signals of the K-channel frequency hopping signals, and obtain K-group channel estimation values, where each channel estimation value includes n channel estimation values. .

The processing module 203 may be specifically configured to: for each group of channel estimation values in the K group channel estimation values, remove the two channel estimation values of the frequency band from the n channel estimation values of each group of channel estimation values. The amplitude difference and the phase difference are obtained, and the updated channel estimation values of the K group are obtained, and the updated channel estimation values of each group include the updated n channel estimation values.

The second estimation module 204 is specifically configured to: perform positioning parameter estimation on each updated channel estimation value of the updated channel estimation value of the K group, and obtain K positioning sub-parameters; and the K positioning locators The parameters are weighted averaged to obtain the positioning parameters.

Optionally, the second estimating module 204 is specifically configured to:

Calculating a statistical parameter of the K positioning sub-parameters, where the statistical parameter includes n of the average value, the median, the maximum value, and the minimum value; and determining the positioning parameter according to the K positioning sub-parameters and the statistical parameter, The positioning parameter T satisfies:

Where σ(i) is the preset weight value of the i-th antenna, t(i) is the i-th positioning sub-parameter, L is the number of statistical parameters, and α(j) is the preset of the j-th statistical parameter. The weight value, s(j) is the jth statistical parameter.

In summary, the present application provides a channel estimation apparatus for a frequency hopping signal. When a receiving end device receives a channel estimation request, each of the hopping signals of the received n frequency hopping time slots may be hopped. The frequency hopping frequency hopping signal is subjected to channel estimation to obtain n channel estimation values. Then, the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values are eliminated, and the updated n channel estimation values are obtained, because the amplitude and the updated n channel estimation values are The phase is continuous, so the updated n channel estimation values are equivalent to channel estimation values of a wideband signal, and the accuracy of parameter estimation according to the channel estimation value of the wideband signal is higher than the channel estimation value of the narrowband signal. ,better result.

The embodiment of the present invention further provides a channel estimation system for a frequency hopping signal, and the system may include a transmitting end device and a receiving end device, and the receiving end device may include a channel estimation of the frequency hopping signal as shown in FIG. 4 or FIG. The apparatus, wherein the apparatus shown in FIG. 13 may include a processing module as shown in FIG.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, it may be implemented in whole or in part in the form of a computer program product comprising one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions described in accordance with embodiments of the present invention are generated in whole or in part. The computer can be a general purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a readable storage medium of a computer or transferred from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be from a website site, computer, server or data The center transmits to another website site, computer, server, or data center by wire (eg, coaxial cable, fiber optic, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.). The computer readable storage medium can be any available medium that can be accessed by a computer or include a Or a data storage device such as a server, data center, or the like that is integrated with available media. The usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium, or a semiconductor medium (eg, a solid state hard disk) or the like.

The above description is only an optional embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the protection of the present application. Within the scope.

Claims (21)

1. A channel estimation method for a frequency hopping signal, characterized in that the method comprises:

   When receiving the channel estimation request, acquiring frequency hopping signals of the n frequency hopping time slots received in the preset time period, the frequency bands corresponding to the frequency hopping signals of the n frequency hopping time slots are continuous, and the n is greater than An integer of 1;

   And performing channel estimation on the frequency hopping signals of the hopping time slots of the n frequency hopping time slots, to obtain n channel estimation values, where each channel estimation value corresponds to one frequency band;

   And eliminating an amplitude difference and a phase difference between two channel estimation values of the n channel estimation values, to obtain updated n channel estimation values, and amplitude and phase of the updated n channel estimation values. continuous.
2. The method according to claim 1, wherein the canceling the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values comprises:

   Obtaining, from the n channel estimation values, a first channel estimation value and a second channel estimation value adjacent to the frequency band;

   When the frequency band corresponding to the first channel estimation value and the second channel estimation value has an overlapping frequency band, extracting a first target reference value corresponding to the overlapping frequency band from the first channel estimation value, and extracting from the first channel estimation value Extracting, in the second channel estimation value, a second target reference value corresponding to the overlapping frequency band;

   Determining a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

   Compensating for an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the second target reference value The phase difference compensates for the phase of the channel estimate to be compensated.
3. The method according to claim 1, wherein the canceling the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values comprises:

   Obtaining, from the n channel estimation values, a first channel estimation value and a second channel estimation value adjacent to the frequency band;

   When the frequency band corresponding to the first channel estimation value and the second channel estimation value does not have an overlapping frequency band, the first channel estimation value is extrapolated and interpolated in the frequency domain to obtain a first reference value, where The frequency band corresponding to the second channel estimation value of the first reference value has an overlapping frequency band;

   Extracting, from the first reference value, a first target reference value corresponding to the overlapping frequency band, and extracting, from the second channel estimation value, a second target reference value corresponding to the overlapping frequency band;

   Determining a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

   Compensating for an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the second target reference value The phase difference compensates for the phase of the channel estimate to be compensated.
4. The method according to claim 1, wherein the canceling the amplitude difference and the phase difference of the two channel estimation values adjacent to the frequency band of the n channel estimation values comprises:

   Obtaining, from the n channel estimation values, a first channel estimation value and a second channel estimation value adjacent to the frequency band;

   When there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value, the first channel estimation value is extrapolated and interpolated in the frequency domain to obtain a first reference value, and The second channel estimate is in the frequency domain Performing an extrapolation interpolation process to obtain a second reference value, where the first reference value and the second reference value have overlapping frequency bands;

   Extracting, from the first reference value, a first target reference value corresponding to the overlapping frequency band, and extracting, from the second reference value, a second target reference value corresponding to the overlapping frequency band;

   Determining a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

   Compensating for an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the second target reference value The phase difference compensates for the phase of the channel estimate to be compensated.
5. The method according to claim 3 or 4, wherein the extrapolating and interpolating the first channel estimation value in the frequency domain to obtain a first reference value comprises:

   Constructing a channel estimation value H of the extended frequency band according to the first channel estimation value S;

   When the upper limit frequency of the first frequency band corresponding to the first channel estimation value is equal to the lower limit frequency of the second frequency band corresponding to the second channel estimation value, the lower limit frequency of the extended frequency band and the upper limit of the first frequency band The frequency is equal, and the upper limit frequency of the extended frequency band is located in the second frequency band, and the channel estimation value H of the extended frequency band satisfies:

   

   When the lower limit frequency of the first frequency band is equal to the upper limit frequency of the second frequency band, the upper limit frequency of the extended frequency band is equal to the lower limit frequency of the first frequency band, and the lower limit frequency of the extended frequency band is located in the In the second frequency band, the channel estimation value H of the extended frequency band satisfies:

   

   Where N is the total number of points of the channel estimation value H of the extended frequency band constructed, H(k) is an estimated value of the jth point in the channel estimation value H of the extended frequency band, and M is the first channel estimation The total number of points of the value S, S(j) is an estimated value of the jth point in the first channel estimation value S, w is a preset weight matrix of M×M, and w(k, j) is the The weight of the kth row and the jth column in the weight matrix, N is a positive integer, and M is greater than or equal to N;

   And determining the first reference value according to the first channel estimation value and a channel estimation value of the extended frequency band.
6. The method according to any one of claims 1 to 5, wherein the channel estimation request is a positioning request sent by the mobile terminal, and the acquiring the frequency hopping of the n hopping time slots received within the preset time period Signals, including:

   Obtaining a frequency hopping signal of n frequency hopping time slots sent by the mobile terminal in a preset time period;

   After the updated n channel estimation values are obtained, the method further includes:

   Performing positioning parameter estimation on the updated n channel estimation values to obtain a positioning parameter, where the positioning parameter includes at least one of an arrival time and an arrival time difference.
7. The method according to claim 6, wherein before the acquiring the frequency hopping signals of the n hopping time slots received in the preset time period, the method further comprises:

   When the positioning request is received, detecting whether the moving speed of the mobile terminal is less than a preset speed threshold;

   When the moving speed of the mobile terminal is less than the preset speed threshold, the indication information is sent to the mobile terminal, where the indication information includes a target hopping pattern, where the indication information is used to indicate that the mobile terminal is in accordance with the Target frequency hopping The pattern transmits a frequency hopping signal, the target hopping pattern occupies the entire system bandwidth, and the frequency bands corresponding to the two adjacent hopping time slots are adjacent.
8. The method according to claim 6, wherein the frequency hopping signals of the n frequency hopping slots comprise K hopping signals received by K antennas, wherein each frequency hopping signal comprises n frequency hopping signals a frequency hopping signal of a time slot, wherein K is an integer greater than one;

   And performing channel estimation on the frequency hopping signal of each of the hopping time slots in the frequency hopping signals of the n frequency hopping time slots, including:

   Performing channel estimation on each of the hopping signals of the K-channel frequency hopping signals respectively, to obtain K-group channel estimation values, wherein each group of channel estimation values includes n channel estimation values;

   The canceling the amplitude difference and the phase difference between the two channel estimation values of the n channel estimation values, and obtaining the updated n channel estimation values, including:

   For each set of channel estimation values of the K sets of channel estimation values, canceling the amplitude difference and phase difference of the two channel estimation values adjacent to the frequency band among the n channel estimation values of each set of channel estimation values, obtaining K The updated channel estimation value of each group includes the updated n channel estimation values in each group of updated channel estimation values;

   And performing positioning parameter estimation on the updated n channel estimation values to obtain positioning parameters, including:

   Performing positioning parameter estimation on each updated channel estimation value of the updated channel estimation values of the K group, to obtain K positioning sub-parameters;

   Performing weighted averaging on the K positioning sub-parameters to obtain the positioning parameters.
9. The method according to claim 8, wherein the weighting average of the K positioning sub-parameters to obtain the positioning parameters comprises:

   Calculating a statistical parameter of the K positioning sub-parameters, the statistical parameter including at least one of an average value, a median, a maximum value, and a minimum value;

   Determining the positioning parameter according to the K positioning sub-parameters and the statistical parameter, where the positioning parameter T satisfies:

   

   Where σ(i) is the preset weight value of the i-th antenna, t(i) is the i-th positioning sub-parameter, L is the number of statistical parameters, and α(j) is the preset of the j-th statistical parameter. The weight value, s(j) is the jth statistical parameter.
10. A channel estimation apparatus for a frequency hopping signal, characterized in that the apparatus comprises:

    The acquiring module is configured to: when receiving the channel estimation request, acquire a frequency hopping signal of the n frequency hopping time slots received in the preset time period, where the frequency bands corresponding to the frequency hopping signals of the n frequency hopping time slots are continuous;

    a first estimation module, configured to perform channel estimation on the frequency hopping signals of each of the hopping frequency hopping frequency hopping signals, to obtain n channel estimation values, where each channel estimation value corresponds to One frequency band;

    a processing module, configured to cancel an amplitude difference and a phase difference between two channel estimation values of the n channel estimation values, to obtain updated n channel estimation values, and the updated n channel estimates The magnitude and phase of the values are continuous.
11. The device according to claim 10, wherein the processing module comprises:

    Obtaining a submodule, configured to obtain, from the n channel estimation values, a first channel estimation value and a second signal adjacent to the frequency band Estimated value;

    a first extraction submodule, configured to: when the frequency band corresponding to the first channel estimation value and the second channel estimation value has an overlapping frequency band, extract, from the first channel estimation value, a corresponding to the overlapping frequency band a target reference value, and extracting, from the second channel estimation value, a second target reference value corresponding to the overlapping frequency band;

    Determining a submodule, configured to determine a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

    a processing submodule, configured to compensate an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the The phase difference of the second target reference value compensates for the phase of the channel estimation value to be compensated.
12. The device according to claim 10, wherein the processing module comprises:

    Obtaining a submodule, configured to obtain, from the n channel estimation values, a first channel estimation value and a second channel estimation value that are adjacent to the frequency band;

    And an extrapolation sub-module, configured to perform extrapolation interpolation processing on the first channel estimation value in the frequency domain when there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value, a first reference value, where the first reference value and the second channel estimation value have overlapping frequency bands;

    a second extraction submodule, configured to extract a first target reference value corresponding to the overlapping frequency band from the first reference value, and extract a second corresponding to the overlapping frequency band from the second channel estimation value Target reference value;

    Determining a submodule, configured to determine a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

    a processing submodule, configured to compensate an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the The phase difference of the second target reference value compensates for the phase of the channel estimation value to be compensated.
13. The device according to claim 10, wherein the processing module comprises:

    Obtaining a submodule, configured to obtain, from the n channel estimation values, a first channel estimation value and a second channel estimation value that are adjacent to the frequency band;

    And an extrapolation sub-module, configured to perform extrapolation interpolation processing on the first channel estimation value in the frequency domain when there is no overlapping frequency band in the frequency band corresponding to the first channel estimation value and the second channel estimation value, a first reference value, and performing extrapolation interpolation processing on the second channel estimation value in the frequency domain to obtain a second reference value, where the frequency band corresponding to the second reference value has an overlapping frequency band;

    a second extraction submodule, configured to extract, from the first reference value, a first target reference value corresponding to the overlapping frequency band, and extract a second target corresponding to the overlapping frequency band from the second reference value Reference.

    Determining a submodule, configured to determine a channel estimation value to be compensated in the first channel estimation value and the second channel estimation value;

    a processing submodule, configured to compensate an amplitude of the to-be-compensated channel estimation value according to the amplitude difference between the first target reference value and the second target reference value; according to the first target reference value and the The phase difference of the second target reference value compensates for the phase of the channel estimation value to be compensated.
14. The device according to claim 12 or 13, wherein the second extraction submodule is configured to:

    Constructing a channel estimation value H of the extended frequency band according to the first channel estimation value S;

    When the upper limit frequency of the first frequency band corresponding to the first channel estimation value is equal to the lower limit frequency of the second frequency band corresponding to the second channel estimation value, the lower limit frequency of the extended frequency band and the upper limit of the first frequency band The frequency is equal, and the upper limit frequency of the extended frequency band is located in the second frequency band, and the channel estimation value H of the extended frequency band satisfies:

    

    When the lower limit frequency of the first frequency band is equal to the upper limit frequency of the second frequency band, the upper limit frequency of the extended frequency band is equal to the lower limit frequency of the first frequency band, and the lower limit frequency of the extended frequency band is located in the In the second frequency band, the channel estimation value H of the extended frequency band satisfies:

    

    Where N is the total number of points of the channel estimation value H of the extended frequency band constructed, H(k) is an estimated value of the jth point in the channel estimation value H of the extended frequency band, and M is the first channel estimation The total number of points of the value S, S(j) is an estimated value of the jth point in the first channel estimation value S, w is a preset weight matrix of M×M, and w(k, j) is the The weight of the kth row and the jth column in the weight matrix, N is a positive integer, and M is greater than or equal to N;

    And determining the first reference value according to the first channel estimation value and a channel estimation value of the extended frequency band.
15. The device according to any one of claims 10 to 14, wherein the channel estimation request is a location request sent by the mobile terminal, and the acquiring module is configured to:

    Obtaining a frequency hopping signal of n frequency hopping time slots sent by the mobile terminal in a preset time period;

    The device also includes:

    And a second estimation module, configured to perform positioning parameter estimation on the updated n channel estimation values, to obtain a positioning parameter, where the positioning parameter includes at least one of an arrival time and an arrival time difference.
16. The device according to claim 15, wherein the device further comprises:

    a detecting module, configured to detect, when the positioning request is received, whether a moving speed of the mobile terminal is less than a preset speed threshold;

    a sending module, configured to send, to the mobile terminal, indication information, where the indication information includes a target hopping pattern, where the indication information is used to indicate the location, when the moving speed of the mobile terminal is less than the preset speed threshold The mobile terminal sends a frequency hopping signal according to the target hopping pattern, the target hopping pattern occupies the entire system bandwidth, and the frequency bands corresponding to the two adjacent hopping time slots are adjacent.
17. The apparatus according to claim 15, wherein the frequency hopping signals of the n frequency hopping slots comprise K hopping signals received by K antennas, wherein each hopping signal comprises n frequency hopping signals a frequency hopping signal of a time slot, wherein K is an integer greater than one;

    The first estimating module is configured to:

    Performing channel estimation on each of the hopping signals of the K-channel frequency hopping signals respectively, to obtain K-group channel estimation values, wherein each group of channel estimation values includes n channel estimation values;

    The processing module is configured to:

    For each set of channel estimation values of the K sets of channel estimation values, canceling the amplitude difference and phase difference of the two channel estimation values adjacent to the frequency band among the n channel estimation values of each set of channel estimation values, obtaining K The updated channel estimation value of each group includes the updated n channel estimation values in each group of updated channel estimation values;

    The second estimation module is configured to:

    Performing positioning parameter estimation on each updated channel estimation value of the updated channel estimation values of the K group, to obtain K positioning sub-parameters;

    Performing weighted averaging on the K positioning sub-parameters to obtain the positioning parameters.
18. The apparatus according to claim 17, wherein said second estimating module is configured to:

    Calculating a statistical parameter of the K positioning sub-parameters, where the statistical parameters include n of an average value, a median, a maximum value, and a minimum value;

    Determining the positioning parameter according to the K positioning sub-parameters and the statistical parameter, where the positioning parameter T satisfies:

    

    Where σ(i) is the preset weight value of the i-th antenna, t(i) is the i-th positioning sub-parameter, L is the number of statistical parameters, and α(j) is the preset of the j-th statistical parameter. The weight value, s(j) is the jth statistical parameter.
19. A computer readable storage medium, wherein the computer readable storage medium stores instructions, when the computer readable storage medium is run on a computer, causing the computer to perform any of claims 1-9 Channel estimation method for frequency hopping signals.
20. A computer program product comprising instructions for causing a computer to perform a channel estimation method for a frequency hopping signal according to any one of claims 1 to 9 when said computer program product is run on a computer.
21. A channel estimation system for a frequency hopping signal, characterized in that the system comprises: a transmitting end device and a receiving end device;

    The receiving device includes: a channel estimating device for a frequency hopping signal according to any one of claims 10 to 18.

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