CN113437994B - Multi-service rapid capturing and receiving device and method based on beacon - Google Patents
Multi-service rapid capturing and receiving device and method based on beacon Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
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- H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
- H04B7/18545—Arrangements for managing station mobility, i.e. for station registration or localisation
- H04B7/18547—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station
- H04B7/1855—Arrangements for managing station mobility, i.e. for station registration or localisation for geolocalisation of a station using a telephonic control signal, e.g. propagation delay variation, Doppler frequency variation, power variation, beam identification
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Abstract
The invention discloses a multi-service rapid capturing and receiving device and method based on beacons. The apparatus of the present invention comprises: the device comprises an AD sampling module, a digital down-conversion module, a beacon signal receiving filter module, a beacon signal capturing and receiving module, a multi-service signal initial position and frequency offset calculation module, a multi-service signal frequency offset correction module, a multi-service signal receiving filter module and a multi-service signal capturing and receiving module. The invention sends beacon signal and service signal at the same time at the information sending end, the time interval of the two signals is known, the information rate of the beacon signal is low, the hardware cost required for completing the capture is low, and in addition, the beacon signal can also carry information and has other purposes; after the beacon signal is captured, the position information of the service signal can be calculated, so that the capture range of the service signal is greatly reduced, and the hardware overhead is reduced; in addition, the frequency offset information obtained by capturing the beacon signal can also be used for correcting the frequency offset of the service signal, thereby improving the capturing performance of the service signal. And the acquisition result of the beacon signal can be used for acquiring the multi-service signal, thereby further reducing the hardware overhead.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a beacon-based multi-service rapid acquisition receiving device and method which can be applied to the fields of satellite communication and the like.
Background
With the rapid development of satellite technology, the demand of satellite communication is increasing, and meanwhile, users have application demands such as voice call, video call, internet access and the like, so that the service rate and the signal bandwidth of satellite communication also need to be improved. The acquisition module is an important component of the satellite receiver, and the acquisition part realizes the rough estimation of the Doppler frequency offset and the code phase of the signal and is the basis for the receiver to accurately track the satellite signal. The satellite transmitter transmits a set of sequences known to the receiver, the known sequences are typically transmitted at the beginning of the message, and the process of searching for the known sequences by the receiver is called signal acquisition.
The existing acquisition methods include a parallel search method based on fast fourier transform, a serial search method based on a correlator, and the like, and for example, CN107942354A discloses a fast acquisition method for inter-station satellite communication. Although the acquisition time is short, the hardware complexity is high in the parallel search method based on the fast Fourier transform. When the existing serial search method is adopted, a received signal is subjected to sliding correlation with a local known sequence after passing through a receiving filter, if the output correlation accumulation result is greater than a preset threshold, the acquisition is successful, when the signal time range is not determined, the received sequence needs to be acquired at each moment, and if the length of the known sequence is longer or the information rate of the signal is higher, the acquisition calculation complexity and the hardware overhead are greatly increased. The acquisition time of the serial search method is relatively long, the method is not suitable for a large dynamic satellite system with a long known sequence, and when a plurality of service signals are acquired, the service signals need to be acquired separately.
Disclosure of Invention
The present invention is directed to a method for acquiring a traffic signal based on a beacon, so as to solve the problems in the background art.
In order to achieve the above object, the present invention provides a multi-service fast acquisition receiving apparatus based on beacon, including: the system comprises an AD sampling module, a digital down-conversion module, a beacon signal receiving filter module, a beacon signal capturing and receiving module, a multi-service signal initial position and frequency offset calculation module, a multi-service signal frequency offset correction module, a multi-service signal receiving filter module and a multi-service signal capturing and receiving module; wherein the content of the first and second substances,
the AD sampling module samples the received data signals to output digital signals, the digital signals are sent to the digital down-conversion module, two paths of zero intermediate frequency signals I/Q are obtained through digital down-conversion, and the signals are sent to the beacon signal receiving filter and the multi-service signal frequency offset correction module; the received data signals comprise beacon signals and service signals, the time interval between the two signals is known, the information rate of the beacon signals ensures that a receiving end can quickly and accurately capture the signals under the conditions that the capture time is less than a capture time threshold and the error rate is less than an error rate threshold, and the service signals are multi-user services or single-user services;
the beacon signal receiving filter receives the I/Q two paths of zero intermediate frequency signals and outputs I/Q two paths of baseband beacon signals to the beacon signal capturing and receiving module; the acquisition receiving module of the beacon signal finishes the acquisition of the beacon signal, and the initial position information t of the beacon signal is obtained after the acquisitionbAnd frequency offset information f of beacon signalbThe start position information t of the beacon signalbSending the data to a multi-service signal acquisition module; frequency offset information f of beacon signalbSending the initial position and the frequency offset to a multi-service signal initial position and frequency offset calculation module;
a multi-service signal initial position and frequency deviation calculation module for calculating frequency deviation information f of the input beacon signalbCalculating to obtain frequency deviation f of service signald，fd＝k*fb+f0Where k is the frequency offset coefficient, f0A fixed frequency offset for the receiving device; estimating the time range t of the service signal from the initial position of the beacon signal according to the transmission time interval, clock difference and filter error between the beacon signal and the service signalrange，trangeIs denoted by t in a manner of upper and lower limitsrs～tre，trsIs the lower limit of the range, treIs the upper limit of the range, based on the start position information t of the input beacon signalbCalculating to obtain the initial position range t of the service signaldIs (t)b+trs)～(tb+tre) (ii) a Each service signal has a corresponding set of frequency deviation coefficients k and a time range t of initial positionrangeAccording to the frequency deviation coefficient k of each of the m service signals and the time range t of the initial positionrangeM is more than or equal to 1, and respective frequency deviation f of m service signals is obtaineddAnd an initial position range td(ii) a Frequency deviation f of m service signalsdRespectively outputting to corresponding multi-service frequency deviation correction modules, and outputting the initial position ranges t of m service signalsdRespectively outputting the signals to corresponding multi-service signal capturing and receiving modules;
the number of the multi-service frequency deviation correction modules is m, and each service frequency deviation correction module uses the frequency deviation f of a corresponding service signaldPerforming frequency mixing processing on the input I/Q two paths of zero intermediate frequency signals, correcting the frequency offset of the I/Q two paths of zero intermediate frequency signals, outputting the intermediate frequency signals after frequency offset correction to corresponding service signal receiving filter modules, outputting m intermediate frequency signals after frequency offset correction in total, and respectively sending the m intermediate frequency signals to corresponding multi-service signal receiving filters;
the multi-service signal receiving filter module comprises m multi-service signal receiving filter modules, each multi-service signal receiving filter module receives the I/Q two-path intermediate frequency signals which are output by the corresponding multi-service frequency offset correction module and subjected to frequency offset correction, outputs the I/Q two-path baseband service signals, sends the I/Q two-path baseband service signals to the multi-service signal capturing and receiving module, outputs m I/Q two-path baseband service signals in total and respectively sends the m I/Q two-path baseband service signals to the corresponding multi-service signal capturing and receiving module;
the number of the multi-service signal capturing and receiving modules is m, each multi-service signal capturing and receiving module receives the I/Q two-path baseband service signals output by the corresponding service signal receiving filter module, and each multi-service signal capturing comprises TdA capturing unit for rapidly capturing the I/Q two-path baseband service signals within a certain capturing range, wherein m multi-service signal capturing and receiving modules capture m groups of I/Q two-path baseband service signals, and the capturing range of each multi-service signal capturing and receiving module is the initial position range t of the service signal corresponding to the moduledThe clock period of the service signal acquisition is tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdAnd the acquisition unit is used for completing the acquisition of the multi-service signal.
Further, the beacon signal capturing and receiving module uses conventional capturing methods, including a serial capturing method, a parallel capturing method and an FFT capturing method; when the serial acquisition method is adopted, a group of known sequences is locally generated and is in sliding correlation with the I/Q two-path base band beacon signals in the full acquisition range, and if the correlation result is larger than a threshold value, the acquisition is proved to be successful.
Furthermore, the capturing units of the multi-service signal capturing and receiving module adopt a serial capturing method, each capturing unit outputs a capturing judgment result, if a certain capturing unit is judged successfully, the capturing is proved to be successful, and if a plurality of capturing units are judged successfully, the moment with the maximum correlation value is used as the starting moment of the service signal.
Furthermore, the multi-user service connection mode includes frequency division multiple access, time division multiple access, code division multiple access and their combination mode.
Further, the service signal receiving filter includes one or more of an FIR filter, an IIR filter, a CIC filter, a raised cosine filter, and a root raised cosine filter.
Further, the transmitted service signal includes one or more of text, audio, picture, and video.
The invention also provides a multi-service rapid acquisition method based on the beacon, which utilizes the multi-service rapid acquisition receiving device based on the beacon and is characterized by comprising the following steps:
a step of sending a data signal by a sending end, wherein the data signal comprises a beacon signal and a service signal, the time interval between the two signals is known, and the information rate of the beacon signal ensures that the receiving end can quickly and accurately capture the data signal under the conditions that the capture time is less than a capture time threshold and the error rate is less than an error rate threshold;
the step of receiving the data signal by the receiving end specifically includes:
step S1: the information receiving end carries out AD sampling on the received data signals, converts the data signals into digital signals from analog signals, and then obtains two paths of zero intermediate frequency signals I/Q through digital down-conversion processing;
step S2: a beacon signal reception filtering and acquisition step,
inputting the two paths of zero intermediate frequency signals obtained in the step 1 into a beacon signal receiving filter, outputting two paths of baseband beacon signals of I/Q, capturing the two paths of baseband beacon signals of I/Q, and obtaining initial position information t of the beacon signals after capturingbAnd frequency offset information f of beacon signalbThe start position information t of the beacon signalbSending the data to a multi-service signal acquisition module; frequency offset information f of beacon signalbSending the initial position and the frequency offset to a multi-service signal initial position and frequency offset calculation module;
step S3: a step of calculating position information and frequency offset information of the multi-service signal,
in this step, the beacon signal frequency offset information f obtained in step S2 is used as the basisbCalculating to obtain frequency deviation f of service signald，fd＝k*fb+f0Where k is the frequency offset coefficient, f0A fixed frequency offset for the receiving device; estimating the time range t of the service signal from the initial position of the beacon signal according to the transmission time interval, clock difference and filter error between the beacon signal and the service signalrange，trangeIs denoted by t in a manner of upper and lower limitsrs～tre，trsIs the lower limit of the range, treIs the upper limit of the range, based on the start position information t of the input beacon signalbCalculating to obtain the initial position range t of the service signaldIs (t)b+trs)～(tb+tre) (ii) a Each service signal has a corresponding set of frequency deviation coefficients k and a time range t of initial positionrangeAccording to the frequency deviation coefficient k of each of the m service signals and the time range t of the initial positionrangeM is more than or equal to 1, and respective frequency deviation f of m service signals is obtaineddAnd an initial position range td(ii) a Frequency deviation f of m service signalsdRespectively outputting to corresponding multi-service frequency deviation correction modules, and outputting the initial position ranges t of m service signalsdRespectively outputting the signals to corresponding multi-service signal capturing and receiving modules;
step S4: a step of correcting the frequency offset of the multi-service signal,
in this step, the m frequency offsets f obtained in step S3 are useddTo a corresponding plurality m of multi-service frequency offset correction modules, each using the frequency offset f of the corresponding service signaldPerforming frequency mixing processing on the input two paths of zero intermediate frequency signals of I/Q, and correcting the frequency deviation of the two paths of zero intermediate frequency signals of I/QOutputting the intermediate frequency signals after frequency offset correction to corresponding service signal receiving filter modules, and outputting m groups of intermediate frequency signals after frequency offset correction to corresponding multi-service signal receiving filters respectively;
step S5: receiving, filtering and rapidly capturing a multi-service signal;
in the step, each service signal receiving filter inputs two paths of intermediate frequency signals of I/Q after frequency offset correction, outputs two paths of baseband service signals of I/Q to corresponding multi-service signal capturing and receiving modules, and m multi-service signal receiving filters output m groups of I/Q baseband service signals; each service signal capturing and receiving module correspondingly and rapidly captures a group of I/Q two-path baseband service signals in a certain capturing range, and the multi-service signal capturing and receiving module firstly obtains an initial position range t according to the step S3dAs the capture range of the corresponding service signal, the clock period of the service signal capture system is tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdThe acquisition units finish the acquisition of multi-service signals, and m multi-service signal acquisition receiving modules acquire m groups of I/Q two paths of baseband service signals.
Further, in step S2, the baseband beacon signal is captured by using a conventional capturing method, including a serial capturing method, a parallel capturing method and an FFT capturing method; when the serial acquisition method is adopted, a group of known sequences is locally generated and is in sliding correlation with the I/Q two-path base band beacon signals in the full acquisition range, and if the correlation result is larger than a threshold value, the acquisition is proved to be successful.
Further, in step S5, the capturing units of the multi-service signal capturing and receiving module adopt a serial capturing method, each capturing unit outputs a capturing decision result, if a certain capturing unit succeeds in deciding, it is proved that the capturing is successful, and if a plurality of capturing units succeed in deciding, the time with the largest correlation value is used as the starting time of the service signal.
Further, the beacon signal is not only used to assist in traffic signal acquisition, but also to carry information or as timing synchronization.
Advantageous effects
The invention simultaneously sends the beacon signal and the service signal at the information sending end, the time interval of the two signals is known, the information rate of the beacon signal is lower, and the hardware cost for completing the capture is lower; after the acquisition of the beacon signal is completed, the acquisition range of the service signal can be greatly reduced, and the beacon signal can acquire the frequency offset information output by the acquisition and can also be used for preliminarily correcting the frequency offset of the service signal, so that the acquisition performance of the service signal is improved. And the acquisition result of the beacon can be used for acquiring a plurality of service signals, thereby further reducing the hardware overhead.
Drawings
Fig. 1 is a schematic block diagram of a fast acquisition method for inter-station satellite communication in the prior art.
FIG. 2 is a schematic diagram of a system for a multi-service rapid acquisition receiving device based on beacons according to the present invention;
fig. 3 is a block diagram of a service signal acquisition module according to the present invention.
Fig. 4 is a schematic diagram of a service signal acquisition unit according to the present invention.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
As shown in fig. 2, the multi-service fast acquisition receiving device based on beacon of the present invention includes: the device comprises an AD sampling module, a digital down-conversion module, a beacon signal receiving filter module, a beacon signal capturing and receiving module, a multi-service signal initial position and frequency offset calculation module, a multi-service signal frequency offset correction module, a multi-service signal receiver filter module and a multi-service signal capturing and receiving module.
The invention utilizes the multi-service rapid acquisition receiving device based on the beacon and also provides a multi-service rapid acquisition method based on the beacon, which comprises the following steps:
a step of sending a data signal by a sending end, wherein the data signal comprises a beacon signal and a service signal, the time interval between the two signals is known, and the information rate of the beacon signal ensures that the receiving end can quickly and accurately capture the data signal under the conditions that the capture time is less than a capture time threshold and the error rate is less than an error rate threshold;
the step of receiving the data signal by the receiving end specifically includes:
step S1: the information receiving end carries out AD sampling on the received data signal, converts the data signal from an analog signal into a digital signal, and then obtains two paths of zero intermediate frequency signals I/Q through digital down-conversion;
step S2: a beacon signal reception filtering and acquisition step,
inputting the two paths of zero intermediate frequency signals I/Q output in the step 1 into a beacon signal receiving filter, outputting two paths of baseband beacon signals I/Q, capturing the two paths of baseband beacon signals I/Q, and obtaining initial position information t of the beacon signals after capturingbThe start position information t of the beacon signalbSending the data to a multi-service signal acquisition module; in addition, frequency offset information f of the beacon signal can be obtained by calculation according to the correlation result acquired by the beacon signalbA 1 is to fbSending the initial position and the frequency offset to a multi-service signal initial position and frequency offset calculation module;
the beacon acquisition employs conventional methods including a serial acquisition method, a parallel acquisition method, and an FFT acquisition method.
Step S3: a step of calculating position information and frequency offset information of the multi-service signal,
in this step, the beacon signal frequency offset information f obtained in step S2 is used as the basisbCalculating to obtain frequency deviation f of service signald，fd＝k*fb+f0Where k is the frequency offset coefficient, f0A fixed frequency offset for the receiving device; estimating the time range t of the service signal from the initial position of the beacon signal according to the transmission time interval, clock difference, filter error and the like between the beacon signal and the service signalrange，trangeIs denoted by t in a manner of upper and lower limitsrs～tre，trsIs the lower limit of the range, treIs the upper limit of the range, based on the start position information t of the input beacon signalbCalculating to obtain service informationInitial position range t of numberdIs (t)b+trs)～(tb+tre) (ii) a Will f isdOutput to the frequency deviation correction moduledOutputting to a multi-service signal capturing and receiving module; m service signals have corresponding m groups of frequency deviation coefficients k and time ranges trangeM is more than or equal to 1, thereby outputting m groups of frequency offsets fdAnd the initial position range td；
Step S4: a step of correcting the frequency offset of the multi-service signal,
in this step, the initial frequency offset f of the service signal obtained in step S3 is obtaineddTo the frequency deviation correction modules, each service frequency deviation correction module uses the input initial frequency deviation fdPerforming frequency mixing processing on the input I/Q two-way zero intermediate frequency signals, correcting the frequency offset of the I/Q two-way zero intermediate frequency signals, outputting the intermediate frequency signals after frequency offset correction to corresponding service signal receiving filter modules, and outputting m groups of intermediate frequency signals after frequency offset correction to corresponding m multiple service signal receiving filters;
step S5: receiving, filtering and rapidly capturing a multi-service signal;
in the step, each multi-service signal receiving filter inputs two paths of intermediate frequency signals of I/Q after frequency offset correction, outputs two paths of baseband service signals of I/Q to a corresponding multi-service signal capturing and receiving module, m multi-service signal receiving filters output m groups of two paths of baseband service signals of I/Q, then each multi-service signal capturing and receiving module rapidly captures the two paths of baseband signals of I/Q of a group of service signals within a certain capturing range, and the multi-service signal capturing and receiving module obtains an initial position range t according to step S3dAs the capture range of the service signal, the clock period of the service signal capture system is tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdThe acquisition units finish the acquisition of multi-service signals, and the acquisition receiving modules of the m multi-service signals acquire I/Q two paths of baseband signals of m groups of service signals.
The multi-service rapid capturing method based on the beacon is also suitable for single-service rapid capturing, and has the advantages that frequency offset information and position information of service signals can be obtained based on the capturing result of the beacon, the subsequent capturing and tracking performance can be better after the service signals are subjected to frequency offset correction, and the service signals can be captured within a determined time range without being captured within the whole arrival time range by utilizing the position information, so that the computation complexity of service signal capturing is greatly reduced, and the hardware cost is reduced.
The multi-user service connection mode of the present invention may be FDMA (Frequency Division Multiple Access), TDMA (Time Division Multiple Access), CDMA (Code Division Multiple Access), and a combination thereof. The acquisition of the multi-service signal completely depends on the acquisition result of the beacon signal, so that the acquisition speed and the acquisition precision of the beacon signal are required to be improved as much as possible, the known sequence length of the beacon signal can be selected and used, the high-performance related code sequence is selected as the known sequence, and a proper beacon acquisition decision threshold is set.
According to the service signal receiving filter, different service signals can use different types of receiving filters or filter groups according to requirements, and the different types of receiving filters or filter groups comprise one or more of FIR filters, IIR filters, CIC filters, raised cosine filters, root raised cosine filters and the like. The service of the invention comprises one or more of characters, audio, pictures and video. Further, with the present invention, the beacon signal can be used not only for assisting the service signal acquisition, but also for other purposes, such as carrying information or as timing synchronization.
Example 1
The service signal is a single service signal, and at the information sending end, the known sequence of the beacon signal is CbLength of LbThe known sequence of the service signal is CDRespectively of length LD. At the information receiving end, the quick acquisition based on the beacon is completed through the following steps:
step 1: the information receiving end firstly carries out AD sampling on a received signal to output a digital signal, and then obtains two paths of zero intermediate frequency signals I/Q through digital down-conversion.
Step 2: beacon signal reception filtering and capturing; and (3) sending the I/Q two paths of zero intermediate frequency signals output in the step (1) to a beacon signal receiving filter, and outputting beacon baseband signals. Beacon acquisition uses conventional acquisition methods including a serial acquisition method, a parallel acquisition method, and an FFT acquisition method. When a serial acquisition method is adopted to acquire the beacon baseband signal, a group of known sequences C is generated locallybAnd sliding and correlating the beacon baseband signal in the full capture range, if the correlation result is greater than a threshold value, proving that the capture is successful, and recording the initial position t of the beacon signalbAccording to the correlation result and LbCalculating the frequency offset f of the beacon signalb。
And step 3: calculating position information and frequency offset information of the multi-service signal; the initial frequency offset f of the multi-service signal can be calculated according to the frequency offset information of the beacon signal obtained in the step 2d＝k*fb+f0Wherein f isbFrequency offset information for the beacon signal; k is a frequency offset coefficient and is related to factors such as a sending time interval, clock error and the like between the beacon signal and the multi-service signal; f. of0The frequency offset is fixed for the system and is associated with the receiving system. According to the factors of the sending time interval, clock error, filter error and the like between the beacon signal and the multi-service signal, the time range t of the multi-service signal from the initial position of the beacon signal can be estimatedrangeLet t berangeIs trs～treAccording to the initial position information t of the beacon signal obtained in step 2bThe initial position t of the multi-service signal can be calculateddIs (t)b+trs)～(tb+tre)。
And 4, step 4: correcting the frequency offset of the service signal; service signal frequency offset information f obtained by calculation in step 3dAnd (3) a frequency offset correction module is given, the two paths of zero intermediate frequency signals of I/Q output in the step (1) are respectively subjected to frequency mixing according to the frequency offset information, and the intermediate frequency signals after frequency offset correction are output to a service signal receiving filter.
And 5: receiving, filtering and quickly capturing a service signal; the service signal receiving filter outputs a service baseband signal, the capture range of the service signal is calculated according to the position information of the service signal obtained in the step 3, and the clock period of the service signal capture system of the information receiving end is assumed to be tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdThe acquisition unit finishes the acquisition of the service signal. FIG. 2 is a block diagram of an acquisition module, shown by TdEach capture unit outputs a capture judgment result, if a certain capture unit judges successfully to prove that the capture is successful, if a plurality of capture units judge successfully, the moment with the maximum correlation value is used as the starting moment of the service signal. FIG. 3 is a schematic view of a capture unit, C1～CnFor the locally known sequence, the known sequence of the traffic signal is CDHaving a length LDThen n ═ L in fig. 3DAt (t)b+trs) At the moment, the truncation length is LDService data of, I-way data DI1～DInAre respectively reacted with C1～CnMultiply-and-accumulate, Q-way data DQ1～DQnAre respectively reacted with C1～CnMultiplying and accumulating, calculating the sum of squares of the accumulated results of the path I and the path Q, comparing with a preset threshold, if the sum of squares is larger than the threshold, the judgment is successful, otherwise, the judgment is unsuccessful.
Example 2
The service signal adopts CDMA multiple access mode, and at the information transmitting end, the known sequence of the beacon signal is CbLength of LbM service users use the same carrier wave and use different address codes to distinguish the service users, and the known sequences of the service signals are respectively CD1～CDmRespectively of length LD1～LDm。
At the information receiving end, the quick acquisition based on the beacon is completed through the following steps:
step 1: the information receiving end firstly carries out AD sampling on a received signal to output a digital signal, and then obtains two paths of zero intermediate frequency signals I/Q through digital down-conversion.
Step 2: beacon signal reception filtering and capturing; and (4) sending the zero intermediate frequency signal output in the step (1) to a beacon signal receiving filter, and outputting a beacon baseband signal. Beacon acquisition uses conventional acquisition methods including a serial acquisition method, a parallel acquisition method, and an FFT acquisition method. When the serial capture method captures the beacon baseband signal, a group of known sequences C is generated locallybAnd sliding and correlating the beacon baseband signal in the full capture range, if the correlation result is greater than a threshold value, proving that the capture is successful, and recording the initial position t of the beacon signalbAccording to the correlation result and LbCalculating the frequency offset f of the beacon signalb。
And step 3: calculating position information and frequency offset information of the multi-service signal; the initial frequency offset f of the multi-service signal can be calculated according to the frequency offset information of the beacon signal obtained in the step 2d＝k*fb+f0Wherein f isbFrequency offset information for the beacon signal; k is a frequency offset coefficient and is related to factors such as a sending time interval, clock error and the like between the beacon signal and the multi-service signal; f. of0The frequency offset is fixed for the system and is associated with the receiving system. According to the factors of the sending time interval, clock error, filter error and the like between the beacon signal and the multi-service signal, the time range t of the multi-service signal from the initial position of the beacon signal can be calculatedrangeLet t berangeIs trs～treAccording to the initial position information t of the beacon signal obtained in step 2bThe initial position t of the multi-service signal can be calculateddIs (t)b+trs)～(tb+tre). m groups k, t used by m service signalsrangeParameter, output m fdAnd tdThe value is obtained.
And 4, step 4: correcting the frequency offset of the multi-service signal; respectively outputting the frequency offset information of the m service signals obtained by calculation in the step (3) to the corresponding m frequency offset correction modules, and simultaneously sending the two paths of zero intermediate frequency signals of I/Q output in the step (1) to the m frequency offset correction modules; and each frequency deviation correction module performs frequency mixing operation on the two paths of I/Q zero intermediate frequency signals of the path by using the frequency deviation information of the path, outputs the two paths of I/Q intermediate frequency signals after frequency deviation correction, totally outputs m groups of I/Q two paths of intermediate frequency signals after frequency deviation correction, and respectively sends the signals to the corresponding m service signal receiving filters.
And 5: receiving, filtering and rapidly capturing multi-service signals; m service signal receiving filters receive the I/Q two paths of intermediate frequency signals after the m groups of frequency offsets are corrected, and output m groups of service baseband signals, and m service signal capturing modules are required to capture the m paths of service baseband signals. Taking the capture module of the service signal number 1 as an example, firstly, the capture range of the service signal number 1 is calculated according to the position information of the service signal number 1 obtained in the step 3, and the clock period of the service signal capture system of the information receiving end is assumed to be tclkThen from (t)b+trs) Capturing the number 1 service signal at the moment, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdAnd the acquisition unit finishes the acquisition of the No. 1 service signal. FIG. 2 is a block diagram of an acquisition module, shown by TdEach capture unit outputs a capture judgment result, if a certain capture unit judges successfully to prove that the capture is successful, if a plurality of capture units judge successfully, the moment with the maximum correlation value is used as the starting moment of the No. 1 service signal. FIG. 3 is a schematic view of a capture unit, C1～CnFor the locally known sequence, the known sequence of the No. 1 service signal is CD1Having a length LD1Then n ═ L of the clock of FIG. 3D1At (t)b+trs) At the moment, the truncation length is LD1Service data of, I-way data DI1～DInAre respectively reacted with C1～CnMultiply-and-accumulate, Q-way data DQ1～DQnAre respectively reacted with C1～CnMultiplying and accumulating, calculating the sum of squares of the accumulated results of the path I and the path Q, comparing with a preset threshold, if the sum of squares is larger than the threshold, the judgment is successful, otherwise, the judgment is unsuccessful.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalents, improvements, etc. made within the principle of the present invention are included in the scope of the present invention.
Claims (10)
1. A multi-service fast acquisition beacon-based receiving apparatus, comprising: the system comprises an AD sampling module, a digital down-conversion module, a beacon signal receiving filter module, a beacon signal capturing and receiving module, a multi-service signal initial position and frequency offset calculation module, a multi-service signal frequency offset correction module, a multi-service signal receiving filter module and a multi-service signal capturing and receiving module; wherein the content of the first and second substances,
the AD sampling module samples the received data signals to output digital signals, the digital signals are sent to the digital down-conversion module, two paths of zero intermediate frequency signals I/Q are obtained through digital down-conversion, and the signals are sent to the beacon signal receiving filter module and the multi-service signal frequency offset correction module; the received data signal comprises a beacon signal and a service signal, the time interval between the two signals is known, and the service signal is a multi-user service or a single-user service;
the beacon signal receiving filter module receives the I/Q two paths of zero intermediate frequency signals and outputs I/Q two paths of baseband beacon signals to the beacon signal capturing and receiving module; the beacon signal capturing and receiving module finishes capturing the beacon signal and obtains the initial position information t of the beacon signal after capturingbAnd frequency offset information f of beacon signalbThe start position information t of the beacon signalbSending the information to a multi-service signal initial position and frequency offset calculation module to obtain frequency offset information f of the beacon signalbSending the initial position and the frequency offset to a multi-service signal initial position and frequency offset calculation module;
a multi-service signal initial position and frequency deviation calculation module for calculating the frequency deviation information f of the input beacon signalbCalculating to obtain frequency deviation f of service signald，fd＝k*fb+f0Where k is the frequency offset coefficient, f0A fixed frequency offset for the receiving device; estimating the time range t of the service signal from the initial position of the beacon signal according to the transmission time interval, clock difference and filter error between the beacon signal and the service signalrange，trangeIs denoted by t in a manner of upper and lower limitsrs～tre，trsIs the lower limit of the range, treIs the upper limit of the range, based on the start position information t of the input beacon signalbCalculating to obtain the initial position range t of the service signaldIs (t)b+trs)～(tb+tre) (ii) a Each service signal has a corresponding frequency deviation coefficient k and a time range t of an initial positionrangeAccording to the frequency deviation coefficient k of each of the m service signals and the time range t of the initial positionrangeM is more than or equal to 1, and respective frequency deviation f of m service signals is obtaineddAnd an initial position range td(ii) a Frequency deviation f of m service signalsdRespectively outputting to corresponding frequency deviation correction modules of the multi-service signals, and outputting the initial position ranges t of the m service signalsdRespectively outputting the signals to corresponding multi-service signal capturing and receiving modules;
the number of the multi-service signal frequency offset correction modules is m, and each multi-service signal frequency offset correction module uses the frequency offset f of the corresponding service signaldPerforming frequency mixing processing on the input two paths of zero intermediate frequency signals of I/Q, correcting the frequency offset of the two paths of zero intermediate frequency signals of I/Q, outputting the intermediate frequency signals after frequency offset correction to corresponding multi-service signal receiving filter modules, outputting m intermediate frequency signals after frequency offset correction in total, and respectively sending the m intermediate frequency signals to the corresponding multi-service signal receiving filter modules;
the multi-service signal receiving filter modules are m, each multi-service signal receiving filter module receives the I/Q two-path intermediate frequency signals after frequency offset correction output by the corresponding multi-service signal frequency offset correction module, outputs I/Q two-path baseband service signals, sends the I/Q two-path baseband service signals to the multi-service signal capturing and receiving module, outputs m I/Q two-path baseband service signals in total and respectively sends the m I/Q two-path baseband service signals to the corresponding multi-service signal capturing and receiving module;
the number of the multi-service signal capturing and receiving modules is m, each multi-service signal capturing and receiving module receives the I/Q two-path baseband service signals output by the corresponding multi-service signal receiving filter module, and each multi-service signal capturing and receiving module comprises a TdA capture unit for capturing I/Q two paths of baseband service signals within a certain capture rangeThe method comprises the steps of performing fast acquisition inside, acquiring m groups of I/Q two-path baseband service signals by m multi-service signal acquisition and receiving modules, wherein the acquisition range of each multi-service signal acquisition and receiving module is the initial position range t of the service signal corresponding to the moduledThe clock period of the service signal acquisition is tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdAnd the acquisition unit is used for completing the acquisition of the multi-service signal.
2. The beacon-based multi-service fast acquisition receiving device according to claim 1, wherein the beacon signal acquisition receiving module uses a conventional acquisition method including a serial acquisition method, a parallel acquisition method and an FFT acquisition method; when the serial acquisition method is adopted, a group of known sequences is locally generated and is in sliding correlation with the I/Q two-path base band beacon signals in the full acquisition range, and if the correlation result is larger than a threshold value, the acquisition is proved to be successful.
3. The beacon-based multi-service fast acquisition and reception apparatus according to claim 1, wherein the acquisition units of the multi-service signal acquisition and reception module employ a serial acquisition method, each acquisition unit outputs an acquisition decision result, if a certain acquisition unit decides successfully, it proves that the acquisition is successful, and if a plurality of acquisition units decide successfully, the time at which the correlation value is the largest is used as the start time of the service signal.
4. The device of claim 1, wherein the multi-user service connection comprises frequency division multiple access, time division multiple access, code division multiple access, and combinations thereof.
5. The device as claimed in claim 1, wherein the multi-service signal receiving filter module comprises one or more of FIR filter, IIR filter, CIC filter, raised cosine filter, and root raised cosine filter.
6. A beacon-based multi-service fast capture receiver as claimed in claim 1, wherein the service signal includes one or more of text, audio, picture, video.
7. A beacon-based multi-service fast acquisition method using the beacon-based multi-service fast acquisition receiving apparatus of claim 1, comprising the steps of:
a step of transmitting a data signal by a transmitting end, wherein the data signal comprises a beacon signal and a service signal, and the time interval between the two signals is known;
the step of receiving the data signal by the receiving end specifically includes:
step S1: the information receiving end carries out AD sampling on the received data signals, converts the data signals into digital signals from analog signals, and then obtains two paths of zero intermediate frequency signals I/Q through digital down-conversion processing;
step S2: a beacon signal reception filtering and acquisition step,
in this step, the two paths of zero intermediate frequency signals I/Q obtained in step S1 are input into a beacon signal receiving filter module, two paths of baseband beacon signals I/Q are output, the two paths of baseband beacon signals I/Q are captured, and the initial position information t of the beacon signal is obtained after the capture is completedbAnd frequency offset information f of beacon signalbThe start position information t of the beacon signalbSending the information to a multi-service signal initial position and frequency offset calculation module to obtain frequency offset information f of the beacon signalbSending the initial position and the frequency offset to a multi-service signal initial position and frequency offset calculation module;
step S3: a step of calculating position information and frequency offset information of the multi-service signal,
in this step, the frequency offset information f of the beacon signal obtained in step S2 is usedbCalculating to obtain frequency deviation f of service signald，fd＝k*fb+f0Where k is the frequency offset coefficient, f0A fixed frequency offset for the receiving device; estimating the time range t of the service signal from the initial position of the beacon signal according to the transmission time interval, clock difference and filter error between the beacon signal and the service signalrange，trangeIs denoted by t in a manner of upper and lower limitsrs～tre，trsIs the lower limit of the range, treIs the upper limit of the range, based on the start position information t of the input beacon signalbCalculating to obtain the initial position range t of the service signaldIs (t)b+trs)～(tb+tre) (ii) a Each service signal has a corresponding set of frequency deviation coefficients k and a time range t of initial positionrangeAccording to the frequency deviation coefficient k of each of the m service signals and the time range t of the initial positionrangeM is more than or equal to 1, and respective frequency deviation f of m service signals is obtaineddAnd an initial position range td(ii) a Frequency deviation f of m service signalsdRespectively outputting to corresponding frequency deviation correction modules of the multi-service signals, and outputting the initial position ranges t of the m service signalsdRespectively outputting the signals to corresponding multi-service signal capturing and receiving modules;
step S4: a step of correcting the frequency offset of the multi-service signal,
in this step, the m frequency offsets f obtained in step S3 are useddTo the corresponding m multi-service signal frequency deviation correction modules, each of which uses the frequency deviation f of the corresponding service signaldPerforming frequency mixing processing on the input two paths of zero intermediate frequency signals of I/Q, correcting the frequency offset of the two paths of zero intermediate frequency signals of I/Q, outputting the intermediate frequency signals after frequency offset correction to corresponding multi-service signal receiving filter modules, outputting m groups of intermediate frequency signals after frequency offset correction in total, and respectively sending the intermediate frequency signals to the corresponding multi-service signal receiving filter modules;
step S5: receiving, filtering and rapidly capturing a multi-service signal;
in the step, each multi-service signal receiving filter module inputs two paths of intermediate frequency signals of I/Q after frequency offset correction, and outputs two paths of baseband service signals of I/Q to corresponding multi-service signal capturing and receiving modules, and m are multipleThe service signal receiving filter module outputs m groups of I/Q two paths of baseband service signals; each multi-service signal capturing and receiving module correspondingly and rapidly captures a group of I/Q two-path baseband service signals within a certain capturing range, and the multi-service signal capturing and receiving module firstly obtains an initial position range t according to the step S3dAs the capture range of the corresponding service signal, the clock period of the service signal capture system is tclkThen from (t)b+trs) Capturing the service signal at the beginning of time, wherein the clock period range needing to be captured is Td＝(tre-trs)/tclkRequiring in total TdThe acquisition units finish the acquisition of multi-service signals, and m multi-service signal acquisition receiving modules acquire m groups of I/Q two paths of baseband service signals.
8. The beacon-based multi-service fast acquisition method according to claim 7, wherein in step S2, the baseband beacon signal is acquired by a conventional acquisition method, including a serial acquisition method, a parallel acquisition method and an FFT acquisition method; when the serial acquisition method is adopted, a group of known sequences is locally generated and is in sliding correlation with the I/Q two-path base band beacon signals in the full acquisition range, and if the correlation result is larger than a threshold value, the acquisition is proved to be successful.
9. The beacon-based multi-service fast acquisition method according to claim 7, wherein in step S5, the acquisition units of the multi-service signal acquisition receiving module adopt a serial acquisition method, each acquisition unit outputs an acquisition decision result, if a certain acquisition unit decides success, the acquisition is proved to be successful, and if a plurality of acquisition units decide success, the time with the largest correlation value is used as the start time of the service signal.
10. A method for multi-service fast acquisition based on beacon according to claim 7, characterized in that the beacon signal is not only used for assisting the acquisition of the service signal, but also used for carrying information or as timing synchronization.
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