CN107124246A - A kind of TD LTE uplink and downlink timeslots match detection method - Google Patents
A kind of TD LTE uplink and downlink timeslots match detection method Download PDFInfo
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- CN107124246A CN107124246A CN201710505741.9A CN201710505741A CN107124246A CN 107124246 A CN107124246 A CN 107124246A CN 201710505741 A CN201710505741 A CN 201710505741A CN 107124246 A CN107124246 A CN 107124246A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0069—Cell search, i.e. determining cell identity [cell-ID]
- H04J11/0073—Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
- H04L1/0038—Blind format detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The present invention provides a kind of TD LTE uplink and downlink timeslots proportioning detection method, obtains TD LTE base band time domain signals, detects the location of PSS signals in signal；According to consensus standard, the subframe belonging to PSS symbols is the special subframe that downstream signal is changed to upward signal, determines that downstream signal switchs to the switching point of upward signal；Mark off the position of 10 subframes in each radio frames；The 2nd subframe and the 7th subframe are removed, cubic metric index is calculated to remaining 8 subframes；According to consensus standard, using the 1st, 3, the difference of the cubic metric index of 6 subframes, determine up-downgoing decision threshold；The position of the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbols, 3 subframes after special subframe are judged respectively, if less than thresholding, as upward signal, this method is simple and quick reliable, and is not influenceed by uplink and downlink signals power difference.
Description
Technical field
Detection method is matched the present invention relates to a kind of TD-LTE uplink and downlink timeslots.
Background technology
It is well known that in TD-LTE communication standards, downstream transmission shares same channel strip in a time multiplexed manner
It is wide.Wherein, using subframe as least unit, it is selective to define 7 kinds of time slot proportions altogether in a radio frames, obtains time slot and matches somebody with somebody
The configuration information of ratio, is the basis that transceiver carries out hardware exchange, so must come out the infomation detection.
In practical communication, the selection of concrete configuration pattern is determined by base station, and mobile terminal needs to send down base station
Row signal, which is decoded, can just obtain this information.It is synchronous that the process is involved in reception, IFFT conversion, channel estimation with
Weighing apparatus, is demodulated, the operation of a series of complex such as channel decoding.But, for the equipment such as repeater, above and below obtaining
Row time slot proportion and carry out such operation, its cost paid will be difficult to receive.
The test problems of time slot proportion are solved, as described above, the sole mode being currently known, is exactly all mobile terminals
Use, according to communication protocol standard, synchronize, IFFT conversion, balanced, demapping, the operation step by step such as decoding.So
Afterwards, defined according to consensus standard, time slot proportion configuration information is read from corresponding control word.It should be noted that mobile whole
The purpose that end carries out this sequence of operations is that, in order to recover original transmitted signal, and the configuration parameter for obtaining time slot proportion is
A wherein unusual small part.
In addition, in order to get around this problem, the TD-LTE repeaters scheme that can be found at present assume repeater it is known its
The time slot proportion configuration information that own base station is used, rather than carry out blind Detecting.Like this, problem just becomes simply.Only
Need to carry out master sync signal (PSS) synchronously, thus obtain the switching point that downstream signal switchs to upward signal, then can basis
Known time slot proportion configuration information, by counter, obtains the switching point that upward signal switchs to downstream signal.So as to complete pair
The differentiation of uplink and downlink signals.
Obviously, there is the problem of cost is excessive in the method that above-mentioned mobile terminal is used.Just to obtain a configuration ginseng
Number, carries out the operation of a series of complex, takes great amount of hardware resources.Purpose is not reciprocity with cost.
And the method that TD-LTE repeaters are used at present, on the premise of being built upon a hypothesis, limit repeater
Use, moreover, in the case of base station modification time slot proportion, will be unable to be adjusted in time, causing the interference to network.
The content of the invention
The technical problem to be solved in the present invention, is to provide a kind of TD-LTE uplink and downlink timeslots proportioning detection method, can be with
It is simple and effective to distinguish uplink and downlink signals.
What the present invention was realized in：A kind of TD-LTE uplink and downlink timeslots match detection method, comprise the following steps：
Step 1, acquisition TD-LTE base band time domain signals；
Step 2, using known master sync signal, computing is carried out to base band time domain signal, PSS signals in signal are detected
Location；
Step 3, according to consensus standard, the subframe belonging to PSS symbols is the special son that downstream signal is changed to upward signal
Frame, determines that downstream signal switchs to the switching point of upward signal；
Step 4, according to consensus standard, the position of PSS symbols is located at the 3rd OFDM symbols of the 2nd or the 7th special subframe
At number, the position of 10 subframes in each radio frames is marked off；
Step 5, the 2nd subframe of removing and the 7th subframe, cubic metric index is calculated to remaining 8 subframes；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downstream signal, and the 3rd subframe is fixed as up
Signal, using the 1st, 3, the difference of the cubic metric index of 6 subframes, determine up-downgoing decision threshold；
Step 7, according to consensus standard, the 1st, the 2nd or the 3rd subframe knot after special subframe where PSS symbols
3 subframes after special subframe, using obtained cubic metric decision threshold, are judged, such as by the position of beam respectively
Fruit is less than thresholding, as upward signal.
Further, the step 1 is further specifically, using sample frequency as 30.72MHz, when obtaining TD-LTE base band
Domain signal.
Further, step 2 is specially further：Using known master sync signal, base band time domain signal is carried out mutual
Related operation, detects the location of PSS signals in signal.
Further, the step 7 is specially further：According to consensus standard, after special subframe where PSS symbols
The position of 1st, the 2nd or the 3rd sub- frame end, using obtained cubic metric decision threshold, respectively to special subframe
3 subframes afterwards are judged, if the 1st subframe is less than thresholding, and the 2nd and the 3rd sub- vertical frame dimension are in thresholding, then upward signal
Switch to the switching point of downstream signal at the end of the 1st subframe；If the 1st and the 2nd subframe are less than thresholding, the 3rd subframe
Higher than thresholding, then upward signal switchs to the switching point of downstream signal at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd
Individual to be below thresholding, then upward signal switchs to the switching point of downstream signal at the end of the 3rd subframe.
Further, the step 6 is specially further：According to consensus standard, the 1st and the 6th subframe are fixed as down
Row signal, the 3rd subframe is fixed as upward signal, using the 1st, 3, the difference of the cubic metric index of 6 subframes, choose these three
The cubic metric index average of subframe as up-downgoing decision threshold.
The invention has the advantages that：A kind of TD-LTE uplink and downlink timeslots proportioning detection method of the present invention so that taking
In the case that data is minimum, realize that total blindness detects.
Brief description of the drawings
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is frame composition schematic diagram of the present invention.
Fig. 2 is the schematic diagram of cubic metric index of the present invention.
Fig. 3 is the method flow diagram of the specific embodiment of the present invention.
Fig. 4 is a kind of baseband signal schematic diagram of uplink and downlink timeslot proportioning of the invention.
Fig. 5 is the schematic diagram of the cubic metric index of Fig. 4 signals.
Embodiment
As shown in figure 1, TD-LTE uplink and downlink timeslots proportioning detection method of the present invention, comprises the following steps：
Step 1, using sample frequency as 30.72MHz, obtain TD-LTE base band time domain signals；
Step 2, using known master sync signal, computing cross-correlation is carried out to base band time domain signal, detected in signal
The location of PSS signals；
Step 3, according to consensus standard, the subframe belonging to PSS symbols is the special son that downstream signal is changed to upward signal
Frame, determines that downstream signal switchs to the switching point of upward signal；
Step 4, according to consensus standard, the position of PSS symbols is located at the 3rd OFDM symbols of the 2nd or the 7th special subframe
At number, the position of 10 subframes in each radio frames is marked off；
Step 5, the 2nd subframe of removing and the 7th subframe, cubic metric index is calculated to remaining 8 subframes；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downstream signal, and the 3rd subframe is fixed as up
Signal, using the 1st, 3, the difference of the cubic metric index of 6 subframes, choose the cubic metric index average conduct of these three subframes
The decision threshold of up-downgoing；
Step 7, according to consensus standard, the 1st, the 2nd or the 3rd subframe knot after special subframe where PSS symbols
3 subframes after special subframe, using obtained cubic metric decision threshold, are judged by the position of beam respectively, if
1st subframe is less than thresholding, and the 2nd and the 3rd sub- vertical frame dimension are in thresholding, then upward signal switchs to the switching point of downstream signal the
At the end of 1 subframe；If the 1st and the 2nd subframe are less than thresholding, the 3rd sub- vertical frame dimension is in thresholding, then under upward signal switchs to
The switching point of row signal is at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd is below thresholding, upward signal turns
For downstream signal switching point at the end of the 3rd subframe.
A kind of embodiment of the present invention：
The present invention utilizes the difference of TD-LTE up-downgoing modulation systems, corresponding time-domain signal cubic metric (Cubic
Metric, CM) indicator difference, carry out the differentiation of uplink and downlink signals.
Cubic metric belongs to a kind of statistical indicator for time domain plethysmographic signal, and its value is related to signal modulation mode, and
Do not influenceed by signal watt level.
The calculation formula of cubic metric is
Wherein, K is constant, K>0,X ' expressions x conjugation turns
Put, verf (t) is reference signal, v (t) is collection signal, vnorm(t) it is that standardization has been carried out to collection signal.
TD-LTE upward signals use SC-FDMA modulation systems, and downstream signal uses OFDMA modulation systems.It is distinguished
Cubic metric index is calculated, as shown in Fig. 2 the cubic metric index of OFDMA signals is apparently higher than SC-FDMA signal.Enter enough
The differentiation of row uplink and downlink signals.Simultaneously, it can also be seen that the cubic metric index PAPR index more conventional than before, with more obvious
Discrimination.
As shown in figure 3, the method for the detection TD-LTE uplink and downlink timeslots proportioning comprises the following steps：
(1) TD-LTE base band time domain signals are obtained, sample frequency is 30.72MHz, it is assumed that one group uses mould
The baseband signal of the uplink and downlink timeslot of formula 6 proportioning；
(2) using known three kinds of PSS signals, computing cross-correlation is carried out respectively to base band time domain signal, by detecting peak
Value, obtains PSS locations in the signal；
(3) according to consensus standard, the subframe belonging to PSS symbols is the special subframe that downstream signal is changed to upward signal.
Based on the definition to symbol in special subframe, as shown in figure 1, being special without signal between being located therein during the GP symbols of part
Door is used for the switching time that downstream signal switchs to upward signal.It therefore, it can on the basis of PSS positions, found by counter
The intermediate point of GP symbols, is used as descending up time-switching point；
(4) simultaneously, according to consensus standard, the position of PSS symbols is located at the 3rd OFDM of the 2nd or the 7th special subframe
At symbol, on the basis of PSS position, start counter, the end position of special subframe residing for PSS can be found, then, it is known that
Every 30720 sampled points are a subframe, thus can mark off the position of 10 subframes in each radio frames；
(5) the 2nd special subframe and the 7th possible special subframe are removed, remaining 8 subframes are calculated respectively cube
Measure Indexes.Formula is
Result of calculation is as shown in Fig. 5 figures.
(6) according to consensus standard, the 1st and the 6th subframe are fixed as downstream signal, and the 3rd subframe is fixed as up letter
Number.Therefore, using the 1st, 3, the difference of the cubic metric index of 6 subframes, choose its average as the decision threshold of up-downgoing；
(7) according to consensus standard, the switching point that upward signal switchs to downstream signal is only possible to appear in 3 positions, i.e. PSS
The position of the 1st, the 2nd or the 3rd sub- frame end after special subframe where symbol.Therefore, it is vertical using what is obtained
3 subframes after special subframe are judged by side's measurement decision threshold respectively.If the 1st subframe is less than thresholding, the 2nd
Individual and the 3rd sub- vertical frame dimension switchs to the switching point of downstream signal at the end of the 1st subframe in thresholding, then upward signal；If
1st and the 2nd subframe are less than thresholding, and the 3rd sub- vertical frame dimension is in thresholding, then upward signal switchs to the switching point of downstream signal the
At the end of 2 subframes；If the 1st, the 2nd and the 3rd is below thresholding, upward signal switchs to the switching of downstream signal
O'clock at the end of the 3rd subframe.In order to improve the accuracy of detection, interference is eliminated, can be to the cubic metrics of continuous multiple frames
Value is averaged, and introducing state machine pattern is locked to testing result.
Although the foregoing describing the embodiment of the present invention, those familiar with the art should manage
Solution, the specific embodiment described by us is merely exemplary, rather than for the restriction to the scope of the present invention, is familiar with this
The equivalent modification and change that the technical staff in field is made in the spirit according to the present invention, should all cover the present invention's
In scope of the claimed protection.
Claims (5)
1. a kind of TD-LTE uplink and downlink timeslots match detection method, it is characterised in that：Comprise the following steps：
Step 1, acquisition TD-LTE base band time domain signals；
Step 2, using known master sync signal, computing is carried out to base band time domain signal, detected in signal residing for PSS signals
Position；
Step 3, according to consensus standard, the subframe belonging to PSS symbols is the special subframe that downstream signal is changed to upward signal, really
Make the switching point that downstream signal switchs to upward signal；
Step 4, according to consensus standard, the position of PSS symbols is located at the 3rd OFDM symbol of the 2nd or the 7th special subframe
Place, marks off the position of 10 subframes in each radio frames；
Step 5, the 2nd subframe of removing and the 7th subframe, cubic metric index is calculated to remaining 8 subframes；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downstream signal, and the 3rd subframe is fixed as up letter
Number, using the 1st, 3, the difference of the cubic metric index of 6 subframes, determine up-downgoing decision threshold；
Step 7, according to consensus standard, the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbols
3 subframes after special subframe, using obtained cubic metric decision threshold, are judged, if low by position respectively
In thresholding, as upward signal.
2. a kind of TD-LTE uplink and downlink timeslots proportioning detection method as claimed in claim 1, it is characterised in that：The step 1
Further specifically, using sample frequency as 30.72MHz, obtaining TD-LTE base band time domain signals.
3. a kind of TD-LTE uplink and downlink timeslots proportioning detection method as claimed in claim 1, it is characterised in that：Step 2 enters one
Step is specially：Using known master sync signal, computing cross-correlation is carried out to base band time domain signal, detects that PSS believes in signal
Number location.
4. a kind of TD-LTE uplink and downlink timeslots proportioning detection method as claimed in claim 1, it is characterised in that：The step 7
It is specially further：According to consensus standard, the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbols
Position, using obtained cubic metric decision threshold, 3 subframes after special subframe are judged respectively, if the 1st
Individual subframe is less than thresholding, and the 2nd and the 3rd sub- vertical frame dimension switch to the switching point of downstream signal at the 1st in thresholding, then upward signal
At the end of subframe；If the 1st and the 2nd subframe are less than thresholding, the 3rd sub- vertical frame dimension switchs to descending in thresholding, then upward signal
The switching point of signal is at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd is below thresholding, upward signal switchs to
The switching point of downstream signal is at the end of the 3rd subframe.
5. a kind of TD-LTE uplink and downlink timeslots proportioning detection method as claimed in claim 1, it is characterised in that：The step 6
It is specially further：According to consensus standard, the 1st and the 6th subframe are fixed as downstream signal, and the 3rd subframe is fixed as up
Signal, using the 1st, 3, the difference of the cubic metric index of 6 subframes, choose the cubic metric index average conduct of these three subframes
The decision threshold of up-downgoing.
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| CN107124246B (en) | 2019-01-29 |
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