WO2012062095A1

WO2012062095A1 - Method and apparatus for detecting multi-antenna ranging

Info

Publication number: WO2012062095A1
Application number: PCT/CN2011/074130
Authority: WO
Inventors: 李鹏飞; 鲁志兵
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-11-08
Filing date: 2011-05-16
Publication date: 2012-05-18
Also published as: CN102468889B; CN102468889A

Abstract

A method and an apparatus for detecting multi-antenna ranging are disclosed in the present invention. The method includes the following steps: extracting plurality of carrier pairs from ranging carriers according to different carrier intervals(S302); doing conjugate multiplication on given ranging carrier data corresponding to each carrier pair of the plurality of carrier pairs to obtain single-antenna difference data, and, according to the number of enabled antennae, combining the signal-antenna difference data to generate multi-antenna difference data(S304); doing point-to-point multiplication on the multi-antenna difference data and difference data of local user codes, and according to the result of the point-to-point multiplication, seeking out an average value of power and a peak value of power of the code word of current code(S306). With the method and apparatus of the present invention, the veracity and performance of a system are enhanced and the user experience is improved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Worldwide Interoperability for Microwave Access (WiMAX) system, and more particularly to a multi-antenna ranging (Ranging) detection method and apparatus. . Background technique

WiMAX is a standards-based broadband wireless access technology that provides high-speed connectivity to the Internet with data transmission distances up to 50km. With the development of technical standards, WiMAX gradually realizes the mobilization of broadband services, providing wireless broadband connections in fixed, mobile and portable forms, enabling the formation of "MetroZones" between urban areas and cities, providing users with portable outdoor. Broadband wireless access.

Ranging is a set of operations for ensuring link communication between a mobile station (Mobile Station, MS for short) and a base station (BS). The main functions of Ranging in WiMAX system are: network initial access, network re-access, association processing during handover, frequency offset estimation adjustment, timing estimation, power control adjustment, registration, etc. In the WiMAX system, the Ranging code is transmitted on the uplink allocated Ranging subchannel, and the Ranging code is modulated on the subcarrier of the Ranging channel by using Binary Phase Shift Keying (BPSK), each subcarrier. Modulating one bit, each bit is mapped to the corresponding subcarrier in an order of increasing subcarrier frequency, that is, the lowest indexed bit is modulated on the lowest frequency indexed subcarrier, and the highest indexed bit is modulated on the highest indexed subcarrier. . The Ranging channel may be composed of one or more groups of 6 adjacent subchannels, and the Ranging may be divided into an initial Ranging and a periodic Ranging. 1 is a schematic structural diagram of an initial Ranging symbol according to the related art. As shown in FIG. 1, an initial Ranging is used for a user station (Subscriber Station, SS for short) to start Ranging after initial access, out-of-synchronization, and hard handover. deal with. Wherein, an initial Ranging transmission can be completed between two consecutive symbols, and each symbol period, the same Ranging code is transmitted on the Ranging channel, and a continuous phase is maintained between the two symbols. FIG. 2 is a schematic structural diagram of a periodic Ranging symbol according to the related art. As shown in FIG. 2, a period Ranging is used for SS to perform periodic parameter correction, wherein the adjustment parameters include time, frequency, and power. In the related art, Ranging's detection technologies include:

(1) Time domain correlation method: The code in the frequency domain is transformed into the time domain, and the sliding correlation calculation is performed on the chip with the received time domain signal, namely: power (j) = max( Σ (" + /) (/) ) where , .(/)(/ = 0, 1, 2, . is the sample after the first code is transformed into the time domain, and is the received time domain signal, ρ is the number of possible code words. , is the power of the signal length, powerij ^ j codes. If the peak power obtained is greater than the threshold, it is considered that the Ranging code is detected.

(2) Frequency domain correlation method: The received data is first FFT-transformed into the frequency domain, and then the values of all carriers in the Ranging subchannel are taken out and all possible user codes are correlated, and then IFFT is performed, that is:

M = ∑C _k Y _k exp(2^(m - τ ₀ )ΙΝ) where (^ is the A value of the current code vector, which is the possible code vector of a certain Ranging subchannel on the Ath carrier The signal is transmitted in the frequency domain, N is the symbol length, M is the result of the correlation between the current codeword C and the Ranging carrier data Y, and r is the time delay. Then the peak power and the mean power are solved, if the peak-to-average ratio (peak power) If the ratio of the average power is greater than a certain threshold, then the Ranging code is considered to be detected. However, in the related art described above, the time domain correlation method is too complex, and JxNxNxT N is required to be the symbol length, and P is the code word. Number, Γ is the number of antennas) Submultiple multiplication. The frequency domain correlation method has poor anti-interference ability, and the algorithm performs poorly because the algorithm uses direct addition to perform antenna merging. In addition, the coverage that can be supported is limited to 20 km or less, and cannot satisfy the current users. Coverage needs. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a multi-antenna Ranging detection scheme to at least solve one of the problems of high complexity and poor anti-interference capability of the Ranging detection method in the above related art. In order to achieve the above object, in one aspect of the present invention, a multi-antenna ranging Ranging detection method is provided. The method for detecting multi-antenna ranging Ranging according to the present invention comprises the steps of: extracting a plurality of carrier pairs from a Ranging carrier according to different carrier intervals; and selecting a specific Ranged carrier corresponding to each carrier pair of the plurality of carrier pairs The data is conjugate multiplied to obtain single antenna differential data, and the single antenna differential data is combined according to the number of enabled antennas to generate multi-antenna differential data; and the multi-antenna differential data and the local user code differential data are point-to-point. Multiply, and then calculate the mean power and peak power of the current codeword by multiplying the points by the point. Preferably, before the conjugate multiplication of the specific Ranged carrier data corresponding to each of the plurality of carrier pairs, the method further comprises: combining the received Ranging carrier data according to the assigned weights of the different symbols, Generate specific Ranging carrier data. Preferably, the initial Ranging code corresponding to the received Ranging carrier data is transmitted with 4 symbols. Preferably, in the case that the carrier spacing is a Tile interval, extracting multiple carrier pairs from the Ranging carrier according to different carrier intervals includes: extracting corresponding Tile pairs from the Ranging carrier according to different Tile intervals, and then obtaining more by the Tile pair. Carrier pairs. Preferably, the result of multiplying the point-to-point multiplier to obtain the mean power and the peak power of the current code code word comprises: combining the values of the same carrier interval in the point-to-point multiplication product, passing the fast Fourier transform FFT, and performing the FFT operation according to the FFT operation The resulting result is obtained by taking the mean power and peak power of the current codeword. Preferably, after the result of multiplying the point-to-point multiplier to obtain the mean power and the peak power of the current codeword, the method further includes: determining the peak power in a case where determining that the peak-to-average ratio of the current codeword exceeds the first threshold Whether the ratio of the peak power sum of all the local codes except the current code in the current Ranging area exceeds a second threshold; if the second threshold is exceeded, determining that the current code is a Ranging code to be detected, wherein the peak-to-average ratio is current The ratio of the peak power of the codeword word to the mean power of the current codeword word. Preferably, after determining that the current code is a Ranging code to be detected, the method further comprises: adjusting a peak position corresponding to the current code code word according to a proportional relationship of peak power of the received Ranging carrier data under different symbols. In order to achieve the above object, according to another aspect of the present invention, a multi-antenna ranging Ranging detecting apparatus is also provided. The apparatus for detecting multi-antenna ranging Ranging according to the present invention includes: an extracting module configured to extract a plurality of carrier pairs from a Ranging carrier according to different carrier intervals; and a difference module configured to pair each carrier with the plurality of carriers Perform conjugate multiplication on the corresponding specific Ranging carrier data to obtain single antenna differential data, and combine the single antenna differential data according to the number of enabled antennas to generate multi-antenna differential data; and solve the power module, set to The multi-antenna differential data and the local user code differential data are multiplied point-to-point, and the average power and peak power of the current code code word are obtained by multiplying the result of the point-to-point multiplication. Preferably, the difference module comprises: a generating unit, configured to combine the received Ranging carrier data according to the assigned weights of different symbols to generate specific Ranging carrier data. Preferably, the extraction module is further configured to extract corresponding pair pairs from the Ranging carrier according to different Tile intervals, and then obtain multiple carrier pairs by the Tile pair. Through the invention, the multi-antenna differential data and the local user code differential data point-to-point multiplication method are used to solve the problem that the Ranging detection method in the related art has high complexity and poor anti-interference ability, and the system accuracy and performance are enhanced. , improved user experience. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the drawings: FIG. 1 is a schematic structural diagram of an initial Ranging symbol according to the related art; FIG. 2 is a schematic structural diagram of a periodic Ranging symbol according to the related art; FIG. 3 is a flow chart of a multi-antenna Ranging detecting method according to an embodiment of the present invention; Figure 4 is a block diagram showing the structure of a multi-antenna Ranging detecting device according to an embodiment of the present invention; Figure 5 is a block diagram showing a multi-antenna Ranging detecting device according to a preferred embodiment of the present invention; Figure 6 is a preferred embodiment of the present invention. FIG. 7 is a schematic diagram of partitioning of a tile tile, tile pairing, and extraction of a tile interval according to a preferred embodiment of the present invention; FIG. 8 is a schematic diagram of carrier spacing extraction within a tile according to a preferred embodiment of the present invention; and FIG. 9 is a flow diagram of an implementation of a Ranging hyper-coverage algorithm in accordance with a preferred embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. In this embodiment, according to an embodiment of the present invention, a multi-antenna Ranging detection method is provided, and FIG. 3 is a flowchart of a multi-antenna Ranging detection method according to an embodiment of the present invention. The method includes the following steps: Step S302: Extract multiple carrier pairs from the Ranging carrier according to different carrier intervals; Step S304, perform conjugate phase with specific Ranged carrier data corresponding to each carrier pair of the multiple carrier pairs Multiplying, obtaining single antenna differential data, and combining the single antenna differential data according to the number of enabled antennas to generate multi-antenna differential data; and step S306, multiplying the multi-antenna differential data and the local user code differential data by point-to-point multiplication, Then, the average power and peak power of the current code code word are obtained by the result of multiplying the points by the point. Through the above steps, multi-antenna differential data and local user code differential data point-to-point multiplication are used to solve the problem that the Ranging detection method has high complexity and poor anti-interference ability in the related art, and the system accuracy and performance are enhanced. , improved user experience. For example, the local user code differential data may be a local user code to generate differential data based on multiple carrier pairs. Preferably, in step S304, a specific one corresponding to each carrier pair of the plurality of carrier pairs is to be

Before the Ranging carrier data is conjugate multiplied, the received Ranging carrier data may be combined according to the assigned weights of different symbols to generate specific Ranging carrier data. In the specific implementation process, when multi-symbol Ranging is used for transmission, Ranging detects only one symbol of information, that is, weights the multi-symbol data by weight assignment of different symbols. For example, when transmitting with two symbols Ranging, the carrier data of symbol 1 and symbol 2 are respectively sum, and the weights of the two symbols are respectively sum A, and the weighted and combined symbol data for Ranging processing. (ie, specific Ranging carrier data) is: ⁼ ^ ⁺ ^ ² . This integrates the multi-symbol information, improving the accuracy of the Ranging data and the detection performance of the algorithm. Preferably, the initial Ranging code corresponding to the received Ranging carrier data can be transmitted with 4 symbols. For example, the initial Ranging 釆 is transmitted with 4 symbols, which can achieve ultra-long coverage of 40 kilometers, that is, when there is a need for ultra-long coverage, the initial Ranging can be transmitted with 4 symbols. In this way, the coverage of the base station and the utilization of resources can be improved. Preferably, in step S302, in the case that the carrier spacing is a block (Tile) interval, the corresponding Tile pair may be extracted from the Ranging carrier according to different Tile intervals, and then multiple pairs of carriers are obtained by the Tile pair. The method completes the carrier pair extraction by extracting the pair of pairs, reduces the computational complexity of the system, improves the computational efficiency of the system, and reduces the complexity of the algorithm. Preferably, in step S306, the values of the same carrier interval in the point-to-point multiplication product may be combined and subjected to fast Fourier transform FFT, and the average power of the current code code word is obtained according to the result of the FFT operation. Peak power. This method can improve the accuracy of the algorithm. Preferably, after step S306, in a case where it is determined that the peak-to-average ratio of the current code codeword exceeds the first threshold, determining the peak power and the peak power sum of all the local codes except the current code in the current Ranging region Whether the ratio exceeds the second threshold; if the second threshold is exceeded, determining that the current code is a Ranging code to be detected, wherein the peak-to-average ratio is a ratio of the peak power of the current codeword to the mean power of the current codeword. The method improves the detection rate of the codeword by two threshold comparisons. Preferably, after step S306, the peak position corresponding to the current code code word (ie, the time offset value) may be adjusted according to the proportional relationship of the peak power of the Ranging carrier data received under different symbols. This method can make the time offset value more accurate and improve the performance of the system. For example, the peak position corresponding to the current code code word can be adjusted to obtain the time offset value of the currently detected Ranging code. It should be noted that, in a specific implementation process, the foregoing multiple preferred embodiments may be combined, for example, conjugate multiplied with specific Ranging carrier data corresponding to each carrier pair of multiple carrier pairs to form a single antenna. The carrier data is differentially differentiated data, and according to the number of enabled antennas, multi-antenna combining is performed on the difference data of the single-antenna carrier data to generate the combined carrier data differential data; likewise, according to each carrier of the multiple carrier pairs Conjugating and multiplying the data of the corresponding current user code to form After the difference code between the user code and the difference between the combined carrier data and the user code, the data is subjected to point-to-point multiplication to generate the required differential processing data; and the differential processing data of the carrier pair having the same carrier spacing is accumulated. A sequence of N-point differential processing is generated, where N is the number of carrier intervals; finally, the generated N-point differential sequence is subjected to FFT transformation, and the mean power and peak power of the current codeword. Corresponding to the above method, in the embodiment, a multi-antenna Ranging detecting device is further provided, and FIG. 4 is a structural block diagram of a multi-antenna Ranging detecting device according to an embodiment of the present invention. As shown in FIG. The method includes: an extraction module 42, a difference module 44, and a solution power module 46, which will be described in detail below. The extracting module 42 is configured to extract a plurality of carrier pairs from the Ranging carrier according to different carrier intervals; the difference module 44 is coupled to the extracting module 42 and configured to set a specific Ranging carrier corresponding to each carrier pair of the plurality of carrier pairs The data is conjugate multiplied to obtain single antenna differential data, and the single antenna differential data is combined according to the number of enabled antennas to generate multi-antenna differential data; and the power module 46 is solved and coupled to the difference module 44, which is set to be The multi-antenna differential data and the local user code differential data are multiplied point-to-point, and the average power and peak power of the current code code word are obtained by multiplying the point-to-point multiplication result. Through the above device, the method of multi-antenna differential data and local user code differential data point multiplication is used to solve the problem that the Ranging detection method in the related art has high complexity and poor anti-interference ability, and the system accuracy and performance are enhanced. , improved user experience. FIG. 5 is a structural block diagram of a multi-antenna Ranging detecting apparatus according to a preferred embodiment of the present invention. As shown in FIG. 5, the difference module 44 includes: a generating unit 442 configured to receive the received weights according to different symbols. Ranging carrier data is combined to generate specific Ranging carrier data. Preferably, the extraction module 42 is further configured to extract corresponding pair pairs from the Ranging carrier according to different Tile intervals, and then obtain multiple carrier pairs by the Tile pair. This method can reduce the amount of computation of the system. Preferably, the apparatus further comprises: a codeword detection module 48 coupled to the solution power module 46, configured to detect and time offset correction of the current Ranging codeword. In the specific implementation process, two thresholds may be set in order to detect the current Ranging codeword. For example, in a case where it is determined that the peak-to-average ratio of the current codeword exceeds the first threshold, the codeword detecting module 48 determines the peak power of the current codeword and all the local codes except the current code in the current Ranging region. Whether the ratio of the peak power sum exceeds the second threshold; if the second threshold is exceeded, the current code is determined to be The Ranging code to be detected, wherein the peak-to-average ratio is the ratio of the peak power of the current codeword word to the mean power of the current codeword word. The method improves the detection rate of the codeword by two threshold comparisons. Preferably, the codeword detection module 48 is further configured to adjust the peak position (ie, the time offset value) corresponding to the current codeword word according to the proportional relationship of the peak power of the Ranging carrier data received under different symbols. This method can make the time offset value more accurate and improve the performance of the system. The following various embodiments incorporate the above-described preferred embodiments. Embodiment 1 In this embodiment, a method for detecting multi-antenna ranging in a WiMAX system is provided. The method includes the following steps: Step 1: Initial Ranging is transmitted with 4 symbols to achieve a super long distance of 40 kilometers. cover. Because Α = [ / 1 1 · 2Μ / ^ Χ 3 Χ 1 () ^ / ^ / 2 , where ^ is the time-biased position in _Ranging detection, and ^D ' is the distance between the terminal and the base station calculated based on the current time offset Therefore, it can be seen from the formula that the coverage of the base station is related to the time offset supported by the Ranging code. For example, in the existing algorithm, two symbols are usually used for transmission. When the bandwidth is 10M, the supported time offset range is (-511, 1536). According to the above formula, the current algorithm can support up to 20 kilometers. Coverage. However, the present invention uses the 4-symbol transmission of the initial Ranging, and the maximum supportable time offset range can be (-511, 3584). Similarly, the algorithm can be extended to 40 kilometers in the embodiment of the present invention. Thus, the super-long coverage of the base station of 40 kilometers is achieved. At the same time, the 4-symbol Ranging code is transmitted with backward compatibility, taking into account the base station functions of 20 km and 40 km coverage. In the absence of far-reaching coverage requirements, only the first two symbols of Ranging will be covered by 20 km. When there is a need for far-reaching coverage, the latter two symbols will continue to be processed. This dynamic processing method increases The flexibility of the algorithm avoids excessive power loss in the base station when non-super-range coverage. Step 2: On the basis of fully considering the channel characteristics, the differential processing of the single antenna data and the multi-antenna combining can enhance the anti-interference ability of the algorithm. 6 is a schematic diagram of a multi-antenna difference principle in accordance with a preferred embodiment of the present invention. In a specific implementation process, a possible code vector of a certain Ranging subchannel may be used to transmit a signal in a frequency domain on the kth carrier, and ^J ^ is a channel characteristic of the kth carrier (ie, a frequency response of the channel). , the time delay is ^τ ° (the time delay ^τ ° corresponds to a phase rotation in the frequency domain), then the first The frequency domain signal received on k carriers is ^^^^^^^^^). Similarly, for a possible Ranging subchannel, the possible code vector transmits a signal in the frequency domain on the k+nth carrier (where n is the corresponding carrier interval), which is the channel characteristic of the k+nth carrier (ie, The frequency response of the channel, the time delay is ^Τι , then the frequency domain signal received on the k+nth carrier is Y _k+n H _k+n ep(-j2^k + η)Α/τ, ;). 1^1 = ¹ , the Ranging information on the carrier is conjugated to

Y _k H _k OW ) * Y _k+n H _k+n τ _λ )) , as can be seen from the above formula, the calculated knot

The result can be divided into three parts, wherein - η )) is the conjugate multiplication value of the received Ranging information, and ^H k ^H k _+n is the conjugate value of the adjacent carrier channel characteristic, since 1^1 ^{= 1} , The channel characteristics on different carriers are only reflected in the imaginary part, and the conjugate processing suppresses the interference caused by the channel characteristics of different channels to the Ranging data. The simulation results show that as the number of antennas increases, the performance of the algorithm will be improved. Step 3: Make full use of the Tile structure characteristics of the subchannel in the WiMAX system, simplify the method of extracting the carrier pair by the difference method, reduce the calculation amount, and improve the efficiency of the algorithm. Taking a system with a bandwidth of 10M as an example, among 1024 carriers, Ranging has only 144 effective carriers, but the carrier pair extraction needs to traverse all carriers. According to statistics, the effective calculation rate is less than 1%. Therefore, in this embodiment, the continuity of the internal carrier of the Tile in the Ranging carrier and the characteristic of only 144 effective Ranging carriers are fully utilized, and only 144 carriers are compared in pairs. 7 is a schematic diagram of partitioning, tile pairing, and tile spacing extraction of a carrier tile according to a preferred embodiment of the present invention. FIG. 8 is a schematic diagram of carrier spacing extraction inside a tile according to a preferred embodiment of the present invention, as shown in FIGS. 7 and 8. It is shown that only the interval of the Ranging effective Tile is compared, and the carrier pair is extracted according to the obtained Tile interval, that is, the conjugate carrier pair is extracted from the Ranging carrier by setting a certain carrier interval K. As shown in FIG. 6 , the extracted carrier pairs are first conjugate multiplied by the corresponding Ranging carrier data of each carrier, and then the results of the same carrier interval are multiplied and accumulated. Finally, the single antenna data subjected to the difference operation is added and combined to complete the multi-antenna combining process. Step 4: Weighted merging of multi-symbol Ranging data improves the utilization of Ranging data. In the specific implementation process, different from the other algorithms, the second symbol information is used for the Ranging processing. In the Ranging detection, only one symbol information is used, that is, when the multi-symbol Ranging is sent, Add multi-symbol data by weight assignment of different symbols For the combination of weights, taking two symbols as an example, let the carrier data of symbol 1 and symbol 2 be sum and ^ respectively, and the weights of the two symbols are respectively A, and the symbol data used for Ranging processing after weighting is:

^S = ^P ^. The weighted combination of multi-symbol data avoids the one-sidedness of using data on one symbol alone, synthesizes multi-symbol information, improves the accuracy of Ranging data, and improves the detection performance of the algorithm. It can be seen that in the embodiment, the initial Ringing is transmitted with 4 symbols, and can support super-long coverage of more than 40 kilometers. By differential combining, a high-performance antenna combining method is provided, and the channel impulse response of the received signal is considered. It is not simple as 1; Make full use of the Tile structure of subchannels in WiMAX system and the amount of information on subcarriers, improve the utilization of carrier data information, simplify the processing steps; After the weighted combination of multi-symbol data, the Ranging carrier is improved. The accuracy of the data information. The second embodiment takes a specific application as an example to describe in detail the detection method of the multi-antenna Ranging in the implementation of the present invention. The number of subcarriers for one symbol of the WiMAX system is 1024, the Ranging channel occupies six subchannels, and there are 144 Ranging subchannels. The initial Ranging is implemented with 2 symbols, and the initial Ranging for super far coverage is implemented with 4 symbols. FIG. 9 is a flowchart of an implementation of a Ranging super-far coverage algorithm according to a preferred embodiment of the present invention. As shown in FIG. 9, the method includes the following steps: Step S902, de-channelizing, and extracting Ranging subcarriers. Ranging carrier extraction is performed from the allocated Ranging subchannel according to the derotation in the 802.16e protocol. Step S904, Ranging a total of Couile pair pairs are extracted. For example, Ranging occupies a total of 144 subcarriers and 36 tiles. According to the carrier extraction result in step S902, traversing the 36 tiles of Ranging, each conjugated pair and its corresponding tile interval k are recorded. Step S906, generating differential processing of the local user code and the local user code. For example, the current user code is generated by 144 Bits per user code, where m is the mth user code and j is the jth bit. According to the Tile pair in step S904, the current local code is differentially processed to generate a local code difference result LocCodeDifi esult. Step S908, Ranging differential processing of carrier data. In a specific implementation process, the Ranging code may be combined according to the weight assignment of different symbols to generate Ranging carrier data for processing, where k is a carrier sequence number. According to the Tile pair extracted in step S904, the Ranging carrier data is subjected to single antenna differential processing and multi-antenna addition and combining. The processing principle is as shown in FIG. 6, and the difference result RngDataDifi esult of the Ranging carrier data is generated. Step S910, FFT processing. For example, the local code difference result LocCodeDifi esult generated in step S906 is multiplied by the point RngDataDiflEResult of the Ranging carrier data difference in step S908, and the data having the same carrier spacing in the product is combined and subjected to FFT processing. Step 4 gathers S912 to solve the peak power and the mean power. For example, in the result of the processing in the step S910, the average power ^P and the peak power of the current codeword are generated, and the corresponding peak position Ppos is recorded in step S914, and the threshold is compared. In the specific implementation process, two threshold comparisons may be included here, that is, the peak-to-average comparison is compared with the threshold and the peak power threshold. Among them, the peak-to-average comparison is the initial screening of the Ranging code. For example, to find the ratio of the peak power / ^ and the mean power of the current code, ie p

― peak

^{P is} then compared to the specified threshold of ⁷ ^ (ie, the first threshold), and if ^{> 7} ^ , the first threshold is compared. After all the codewords (ie, the last codeword) have undergone the first threshold comparison, the ratio of the peak power of the current codeword to the peak power sum of all local codes (current codeword New Year's Eve) in the current Ranging region is obtained. The ratio is compared with the second detection threshold (ie, the second threshold). If >, the current code is determined to be the Ranging code to be detected. It should be noted that there is a single threshold comparison different from the original algorithm. In the embodiment of the present invention, the method of comparing the second threshold is to consider a two-dimensional concept, that is, the time offset and the codeword bias. Set. The first threshold is to obtain the maximum value on the practical bias, and the second threshold detection is to filter the codeword in one dimension of the codeword offset. The two-dimensional code is used to filter, thereby improving the detection rate of the codeword. Step S916, calculating a Ranging code to solve the time offset of the Ranging code. Through the peak power comparison of different symbols, the time offset value is solved according to the obtained Ranging code. For example, according to the original received Ranging data, the peak power sum on the first symbol and the second symbol is respectively obtained, and then According to the ratio of ^ and ^, the ^对应 of the current code is corrected to obtain the correct time offset value. In summary, according to the foregoing embodiment, the method of multi-antenna differential data and local user code differential data point-to-point multiplication is used to solve the problem that the Ranging detection method has high complexity and poor anti-interference ability in the related art, and reduces the problem. The amount of computation of the system enhances the accuracy and performance of the system and improves the user experience. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. The steps shown or described are performed, or they are separately fabricated into individual integrated circuit modules, or a plurality of modules or steps are fabricated as a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

1. A multi-antenna ranging Ranging detection method, including the following steps:

Extracting a plurality of carrier pairs from the Ranging carrier according to different carrier intervals; conjugate multiplying the specific Ranged carrier data corresponding to each of the plurality of carrier pairs to obtain single antenna differential data, and Combining the single antenna differential data according to the number of enabled antennas to generate multi-antenna differential data;

And multiplying the multi-antenna differential data and the local user code difference data by point-to-point multiplication, and obtaining the mean power and peak power of the current code code word according to the result of the point-to-point multiplication.

The method according to claim 1, wherein before the conjugate multiplication of the specific Ranging carrier data corresponding to each of the plurality of carrier pairs, the method further includes:

The received Ranging carrier data is combined according to the assigned weights of different symbols to generate the specific Ranging carrier data.

The method according to claim 2, wherein the initial Ranging code corresponding to the received Ranging carrier data is transmitted with 4 symbols.

The method according to claim 1, wherein, when the carrier interval is a tile interval, extracting the plurality of carrier pairs from the Ranging carrier according to different carrier intervals includes:

Extracting corresponding Tile pairs from the Ranging carrier according to different Tile intervals, and then obtaining the multiple carrier pairs by the Tile pair.

5. The method according to claim 4, wherein determining the mean power and peak power of the current code codeword according to the result of the point-to-point multiplication comprises:

The values of the point-to-point multiplied product having the same carrier interval are combined and subjected to fast Fourier transform FFT, and the mean power and peak power of the current code code word are obtained according to the result of the FFT operation.

The method according to any one of claims 1 to 5, wherein after determining the mean power and the peak power of the current codeword according to the result of the point-to-point multiplication, the method further includes: If the peak-to-average ratio of the current codeword word exceeds the first threshold, determining whether the ratio of the peak power to the peak power sum of all local codes except the current code in the current Ranging region exceeds a second threshold;

If the second threshold is exceeded, determining that the current code is a Ranging code that needs to be detected, where the peak-to-average ratio is a ratio of a peak power of the current code codeword to a mean power of the current codeword word. .

7. The method according to claim 6, wherein after determining that the current code is a Ranging code to be detected, the method further includes:

The peak position corresponding to the current code code word is adjusted according to the proportional relationship of the peak power of the Ranging carrier data received under different symbols.

8. Multi-antenna ranging Ranging detection device, including:

An extraction module, configured to extract multiple carrier pairs from the Ranging carrier according to different carrier intervals;

a difference module, configured to conjugate multiply specific Ranging carrier data corresponding to each of the plurality of carrier pairs to obtain single antenna differential data, and to use the single antenna according to the number of enabled antennas The differential data is combined to generate multi-antenna differential data; and the power module is configured to perform point-to-point multiplication of the multi-antenna differential data and the local user code differential data, and then obtain the result according to the point-to-point multiplication The mean power and peak power of the current codeword word.

9. The device according to claim 8, wherein the difference module comprises:

The generating unit is configured to combine the received Ranging carrier data according to the assigned weights of different symbols to generate the specific Ranging carrier data.

10. The apparatus according to claim 8, wherein the extracting module is further configured to extract a corresponding pair of Tiles from the Ranging carrier according to different Tile intervals, and then obtain the multiple by the Tile pair. Carrier pair.