The way to define the time and frequency error of the base station signal and a device for its implementation

 

The invention relates to the field of radio engineering, in particular to a method and device for the determination of the temporal and frequency error signals of base stations and can be used in radio systems for synchronization of base station signals. The technical result is to increase the accuracy of the determination of the temporal and frequency error signals of base stations. To do this, place the device define the time and frequency error signals between the N base stations so that there is a direct rays from each of the N base stations to the device define the time and frequency error signals, determine the temporal position of the maxima of the correlation functions with an accuracy significantly higher than the sampling period, owing to the use of estimates derived correlation functions, determine the difference between the carrier frequencies of the base stations with high accuracy by analyzing the incremental phase shifts and transfer the obtained values of the frequency difference between one of the base stations. In the device define the time and frequency error of the base station signal containing the external port, the control processuality, according to the invention additionally introduced N blocks determination of the temporal position of the signal, N blocks determine the rate of change of the phase signal, the memory block and the block determining the phase and frequency difference signals. 2 S. and 2 C.p. f-crystals, 9 Il.

Description text in facsimile form (see graphic part)

Claims

1. The way to define the time and frequency error signals of base stations, at which place the device define the time and frequency error signals of base stations between the N base stations, where N takes values from 2 or more, determine the distance from each of the N base stations to the device define the time and frequency error signals of base stations, each value a certain distance from the N values used to calculate the time for the direct spread signal from the corresponding base station to the device define the time and frequency error signals of base stations, record the IDs of the N base stations in the device define the time and frequency error signals of base stations, pricepoint the number of base stations in the communication system, the initial time shift ti,0pseudo-random sequence (SRP) of a base station and time of the direct signal propagation from the base station device to define the time and frequency error signals of base stations ti,1namely, that by means of the device define the time and frequency error signals of base stations perform the search signal, the first base station, when searching using the recorded number of the first base station, find the delay time t1,2signal of the first base station and the current time1,3the first base station, characterized in that place the device define the time and frequency error signals of base stations between the N base stations so that there is a direct rays from the device is within line of sight) of each of the N base stations up to it, use the advanced room SRP base station, the identifier of each base station, when the search signal, the first base station optionally use the room SRP first base station and simultaneously with the search signal, the first base station search for the signals of the stations, remember the delay time t1,2signal of the first base station and the current time1,3the first base station, find and remember for each of the N-1 base station delay time ti,2its signal and the current time ti,3given the base station form for each of the N base stations reference signal using its SRP and found values of delay time ti,2its signal simultaneously to each of the N base stations specify the delay time ti,2its signal in P successive stages, where P is an integer greater than or equal to 1, at the end of the P-th stage receives the specified delay time ti,P+3signal the base station, and updating the delay time ti,2signal the base station, each of R successive stages use formed for her reference signal, calculates for each of the N base stations temporary position of the tiits signal from the found values of the adjusted time delay ti,p+3its signal is deducted from the value of the initial time offseti,0its SRP and the value of ti,1time to direct the distribution of its signal to the device define the time and frequency the ti,3the base station and memorize the calculated temporal position tiits signal is determined for each base station, except the first, temporary misalignment its signal relative to the signal of the first base station by subtracting from the value of the temporary provisions of its signal tjwhere j takes values from 2 to N, the value of the temporary provisions of the signal t1the first base station, the received N-1 values of time difference of signals of the N base stations memorize determine simultaneously for each of the N base stations, the rate of change of the phase of its signalfitime equal to the duration of the interval quasicoherent input signal T when determining the rate of change of phase of the signal the base station using the found value of the adjusted delay time its signal ti,P+3determine for each base station than the first frequency misalignment its signal relative to the signal of the first base station by subtracting from the value of the rate of change of the phase of its signalfjwhere j takes values from 2 to N, the values of the rate of change of the signal phasef1first edut obtained values of time and frequency errors of the signals of the N base stations on one of these base stations.

2. The method according to p. 1, wherein each of R successive stages for each of the N base stations perform simultaneous refinement of the delay time ti,2its signal so that the p-th stage, where p is the number of the current phase, which takes values from 1 to P, form the assessment of the temporal offsetthe position of the maximum of the correlation function of the signal the base station relative to the values of delay time ti,2its signal when the value of R equal to 1, and the relative values of the delay time ti,p+2its signal was found in the previous step, a value of R greater than 1, and the calculated correlation of the input signal with the reference signal to the base station on the L1L2where L1is 1 or more, L2is 1 or more consecutive intervals quasicoherent input signal, the duration of each of which is equal to T, in three time positions of the signal - Central, delayed and anticipatory, is the Central time of the position signal when the value of R equal to 1, is equal to the detected value of the delay time ti,2signal the base station, and a value of p greater than 1, Adrianna temporal position of the signal delayed relative to the Central time shift dpanticipatory temporal position of the signal ahead of Central time shift dpreceiving the correlation value is in the Central time positionsthe correlation value detained in temporary positionsand the correlation value in advance temporary positionswhere l1accepts values from 1 to L1, l2accepts values from 1 to L2and time shifts delayed and anticipatory temporal position of the signal relative to the Central temporal position of the signal in one phase are equal and the same for all base stations, and from stage to stage decrease, or not change, average the obtained values of the correlations of the input signal with the reference signal to the base stationin detained, Central and ahead of time the position signal, respectively, forming the accumulation of the signal the base stationin detained, Central and ahead of time the position signal, respectively, are L2time shiftsthe position of the maximum of the correlation function signal> wherethe difference between the values of the accumulation of the signal the base station on the R-th stage in advance and the Central temporary position signal;the difference between the values of the accumulation of the signal the base station on the R-m phase arrested and Central temporal position of the signal average values found time shiftsthe position of the maximum of the correlation function of the signal the base station, receiving a measurement of time-shiftthe position of the maximum of the correlation function of the signal the base station, summarize the resulting value estimates a time offsetand found the value of the delay time ti,2when the p value equal to 1, or the value of the delay time ti,p+2found in the previous step, a value of R greater than 1, receiving the delay time ti,p+3signal the base station at the current stage, and, when reaching the value R value R, the value of the delay time ti,p+3signal the base station at the current stage is equal to the value specified delay time ti,P+3signal the base station.i,P+3calculate the correlation of the input signal and the generated reference signal to the base station on the L3where L3is 1 or more, consecutive time intervals, each of which represents two adjacent interval quasicoherent input signal, the duration of each of which is equal to T, obtaining the L3the first and L3the second correlation values, where the first correlation value is calculated on the earliest of adjacent intervals quasicoherent, and the second correlation value is late, compute complex conjugation on L3the first of the obtained correlation values, multiplying the values of the complex conjugation received from the first correlation values and the second received values of the correlation at each of the L3adjacent intervals and averaging the obtained values, the evaluation of the arguments on the value of the average of the obtained values, receiving the average phase change of the signal the base station, find the rate of change of phase of the signal the base stationfion the interval quasicoherent signal T, as the ratio of the average phase change signal.

4. The device define the time and frequency output filter, analog receiver, the N nodes of the search signal, the digital modulator, the analog transmitter, the first input port is a first input device, the first external output port connected to the first input of the control processor, the first output of which is connected with the second input port, the first antenna input is a second input device, the first antenna output is connected to the first input of a duplex filter, a first output of which is connected to the input of an analog receiver, the output of which is connected with United first inputs of the N nodes of the search, the second input of the first search node is connected with the second output control processor, the third output control processor connected to the first input of the digital modulator, the output of which is connected to the input analog transmitter, the output of which is connected to a second input of a duplex filter, a second output of which is connected with the second antenna input, a second output which is the output device, wherein said introduced N blocks determination of the temporal position of the signal, N blocks determine the rate of change of the phase signal, the memory block, the block determining the phase and frequency difference signal, while the second output is engaged processor, N blocks determination of the temporal position of the signal is performed in such a way that each of them contains a matching of N, one node search signal, the first and second inputs of which are respectively the first and second inputs of the unit determination of the temporal position of the signal, in addition to the N blocks of the determination of the temporal position of the signal entered the site of formation of the reference signal, the node specify the time delay signal and the compute node temporary position signal, the first inputs are combined and attached respectively to the second input node of the search signal, a second input node specify the time delay of the signal connected to the first input node of the search signal, the output node of forming a reference signal is connected to the third input node specify the time delay signal, the third input node of the search signal, the second input node of the formation of the reference signal, the fourth input node specify the time delay signal and the second input node of the calculation of the temporary provisions of the combined signal, forming a third input of the determination of the temporal position of the signal output node search signal, the first output node, specify the time delay and the output of the compute node to the provisional regulations of the signal is of the time delay signal is a second output unit determination of the temporal position of the signal, the third inputs of the N blocks of the determination of the temporal position of the signal connected to the first outputs of the memory block, the input block of the determination of the temporal position of the signal from the second to the N combined and connected to the second input of the first block of the determination of the temporal position of the signal, the first outputs of the N blocks of the determination of the temporal position of the signal connected to third inputs of the memory block, the second outputs connected to the second input of the control processor, the fifth output of which is connected with the second combined inputs of N blocks determine the rate of change of the phase signal, the first inputs are combined and connected to the first inputs of the N blocks of the determination of the temporal position of the signal, the third inputs of N blocks determine the rate of change of phase of the signal connected to the second outputs of the memory block, the outputs of the blocks determine the rate of change of phase of the signal is connected to the fourth inputs of the memory block, the third and fourth outputs of which are respectively connected to first and second inputs of the block determine the time and frequency errors of the signals, a third input connected to the sixth output control processor, and first and second outputs of the block definition temporary and caston is, which is connected to a second input of the digital modulator.

 

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1 cl, 7 dwg, 1 tbl

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