CN107124246B - A kind of TD-LTE uplink and downlink timeslot proportion detection method - Google Patents
A kind of TD-LTE uplink and downlink timeslot proportion detection method Download PDFInfo
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- CN107124246B CN107124246B CN201710505741.9A CN201710505741A CN107124246B CN 107124246 B CN107124246 B CN 107124246B CN 201710505741 A CN201710505741 A CN 201710505741A CN 107124246 B CN107124246 B CN 107124246B
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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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Abstract
The present invention provides a kind of TD-LTE uplink and downlink timeslot proportion detection method, obtains TD-LTE base band time domain signal, detects the location of PSS signal in signal；According to consensus standard, subframe belonging to PSS symbol is the special subframe that downlink signal is converted to uplink signal, determines that downlink signal switchs to the switching point of uplink 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 indexs of 6 subframes, uplink and downlink decision threshold is determined；The position of the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbol, 3 subframes after special subframe are judged respectively, if being lower than thresholding, as uplink signal, this method is simple and quick reliable, and is not influenced by uplink and downlink signals power difference.
Description
Technical field
The present invention relates to a kind of TD-LTE uplink and downlink timeslots to match detection method.
Background technique
It is well known that downstream transmission shares same channel strip in a time multiplexed manner in TD-LTE communication standard
It is wide.Wherein, using subframe as minimum unit, it is selective to define 7 kinds of time slot proportions altogether in a radio frames, obtains time slot
The configuration information of proportion is the basis that transceiver carries out hardware exchange, so must come out the infomation detection.
In practical communication, the selection of concrete configuration mode is determined by base station, under mobile terminal needs to issue base station
Row signal, which is decoded, can just obtain this information.The process be involved in reception synchronize, IFFT transformation, channel estimation and
Weighing apparatus, demodulation, the operation of a series of complex such as channel decoding.But for the equipment such as repeater, just to obtain up and down
Row time slot proportion and carry out such operation, the 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
It uses, according to communication protocol standard, synchronizes, IFFT transformation, balanced, demapping, the operation step by step such as decoding.So
Afterwards, it is 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 to recover original transmitted signal, and the configuration parameter for obtaining time slot proportion is
Wherein very small a part.
In addition, in order to get around this problem, the repeater the TD-LTE scheme that can be found at present assume repeater it is known its
The time slot proportion configuration information that own base station uses, rather than carry out blind Detecting.In this case, problem just becomes simply.Only
It needs to carry out primary synchronization signal (PSS) to synchronize, thus obtains the switching point that downlink signal switchs to uplink signal, it then can basis
Known time slot proportion configuration information obtains the switching point that uplink signal switchs to downlink signal by counter.To completion pair
The differentiation of uplink and downlink signals.
Obviously, the method that above-mentioned mobile terminal uses has that cost is excessive.Just to obtain a configuration ginseng
Number carries out the operation of a series of complex, occupies great amount of hardware resources.Purpose is not reciprocity with cost.
And the method that the repeater TD-LTE uses at present, under the premise of being built upon a hypothesis, limit repeater
It uses, moreover, will be unable to be adjusted in time, causing the interference to network in the case where time slot proportion is modified in base station.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of TD-LTE uplink and downlink timeslot proportion detection method, can be with
Simply and effectively distinguish uplink and downlink signals.
The present invention is implemented as follows: a kind of TD-LTE uplink and downlink timeslot matches detection method, include the following steps:
Step 1 obtains TD-LTE base band time domain signal；
Step 2 detects PSS signal in signal to base band time domain signal progress operation using known primary synchronization signal
Location；
Step 3, according to consensus standard, subframe belonging to PSS symbol is the special son that downlink signal is converted to uplink signal
Frame determines that downlink signal switchs to the switching point of uplink signal；
Step 4, according to consensus standard, the position of PSS symbol be located at the 2nd or the 7th special subframe the 3rd OFDM symbol
At number, the position of 10 subframes in each radio frames is marked off；
Step 5 removes the 2nd special subframe and the 7th special subframe, calculates cubic metric to remaining 8 subframes and refers to
Mark；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downlink signal, and the 3rd subframe is fixed as uplink
Signal determines uplink and downlink decision threshold using the 1st, 3, the difference of the cubic metric indexs of 6 subframes；
Step 7, the 1st, the 2nd or the 3rd subframe knot according to consensus standard, after special subframe where PSS symbol
The position of beam respectively judges 3 subframes after special subframe, such as using obtained cubic metric decision threshold
Fruit is lower than thresholding, as uplink signal.
Further, the step 1 is further specifically, be 30.72MHz with sample frequency, when obtaining TD-LTE base band
Domain signal.
Further, step 2 is further specifically: utilizes known primary synchronization signal, carries out to base band time domain signal mutual
Related operation detects the location of PSS signal in signal.
Further, the step 7 is further specifically: according to consensus standard, after special subframe where PSS symbol
The position of 1st, the 2nd or the 3rd sub- frame end, using obtained cubic metric decision threshold, respectively to special subframe
3 subframes later are judged, if the 1st subframe is lower than thresholding, the 2nd and the 3rd sub- vertical frame dimension are in thresholding, then uplink signal
Switch to the switching point of downlink signal at the end of the 1st subframe；If the 1st and the 2nd subframe are lower than thresholding, the 3rd subframe
Higher than thresholding, then uplink signal switchs to the switching point of downlink signal at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd
A to be below thresholding, then uplink signal switchs to the switching point of downlink signal at the end of the 3rd subframe.
Further, the step 6 is further specifically: according to consensus standard, the 1st and the 6th subframe are fixed as down
Row signal, the 3rd subframe are fixed as uplink signal, using the 1st, 3, the difference of the cubic metric indexs of 6 subframes, choose these three
Decision threshold of the cubic metric index average of subframe as uplink and downlink.
The present invention has the advantage that a kind of TD-LTE uplink and downlink timeslot of the present invention matches detection method, so that occupying
In the least situation of resource, total blindness's detection is realized.
Detailed description of the invention
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 specific embodiments of the present invention.
Fig. 4 is a kind of baseband signal schematic diagram of uplink and downlink timeslot proportion of the present invention.
Fig. 5 is the schematic diagram of the cubic metric index of Fig. 4 signal.
Specific embodiment
As shown in Figure 1, TD-LTE uplink and downlink timeslot of the present invention matches detection method, include the following steps:
Step 1 with sample frequency is 30.72MHz, obtains TD-LTE base band time domain signal；
Step 2 detects in signal base band time domain signal progress computing cross-correlation using known primary synchronization signal
The location of PSS signal；
Step 3, according to consensus standard, subframe belonging to PSS symbol is the special son that downlink signal is converted to uplink signal
Frame determines that downlink signal switchs to the switching point of uplink signal；
Step 4, according to consensus standard, the position of PSS symbol be located at the 2nd or the 7th special subframe the 3rd OFDM symbol
At number, the position of 10 subframes in each radio frames is marked off；
Step 5 removes the 2nd special subframe and the 7th special subframe, calculates cubic metric to remaining 8 subframes and refers to
Mark；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downlink signal, and the 3rd subframe is fixed as uplink
Signal chooses the cubic metric index average conduct of these three subframes using the 1st, 3, the difference of the cubic metric indexs of 6 subframes
The decision threshold of uplink and downlink；
Step 7, the 1st, the 2nd or the 3rd subframe knot according to consensus standard, after special subframe where PSS symbol
The position of beam respectively judges 3 subframes after special subframe using obtained cubic metric decision threshold, if
1st subframe is lower than thresholding, and the 2nd and the 3rd sub- vertical frame dimension are in thresholding, then uplink signal switchs to the switching point of downlink signal the
At the end of 1 subframe；If the 1st and the 2nd subframe are lower than thresholding, the 3rd sub- vertical frame dimension is in thresholding, then uplink signal switchs to
The switching point of downlink signal is at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd is below thresholding, uplink signal
Switch to the switching point of downlink signal at the end of the 3rd subframe.
A kind of specific embodiment of the present invention:
The present invention utilizes the difference of TD-LTE uplink and downlink modulation system, 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 value is related to signal modulation mode, and
It is not influenced by signal watt level.
The calculation formula of cubic metric is
Wherein, K is constant, K > 0,The conjugation of x ' expression x turns
It sets, verf (t) is reference signal, and v (t) is acquisition signal, vnormIt (t) is that standardization has been carried out to acquisition signal.
TD-LTE uplink signal uses SC-FDMA modulation system, and downlink signal uses OFDMA modulation system.It is distinguished
Cubic metric index is calculated, as shown in Fig. 2, the cubic metric index of OFDMA signal is apparently higher than SC-FDMA signal.Enough into
The differentiation of row uplink and downlink signals.Simultaneously, it can also be seen that common PAPR index before cubic metric index ratio has more obvious
Discrimination.
As shown in figure 3, the method for the detection TD-LTE uplink and downlink timeslot proportion includes the following steps:
(1) TD-LTE base band time domain signal, sample frequency 30.72MHz are obtained, it is assumed that one group uses mould
The baseband signal of 6 uplink and downlink timeslot of formula proportion；
(2) known three kinds of PSS signals are utilized, computing cross-correlation is carried out respectively to base band time domain signal, by detecting peak
Value obtains the location in the signal PSS；
(3) according to consensus standard, subframe belonging to PSS symbol is the special subframe that downlink signal is converted to uplink signal.
Based on the definition to symbol in special subframe, as shown in Figure 1, without signal, being special during the GP symbol for being located therein part
Door switchs to the switching time of uplink signal for downlink signal.Therefore, it can be found on the basis of the position PSS by counter
The intermediate point of GP symbol, the time-switching point as downlink uplink；
(4) simultaneously, according to consensus standard, the position of PSS symbol is located at the 3rd OFDM of the 2nd or the 7th special subframe
At symbol, on the basis of the position of PSS, starts counter, the end position of special subframe locating for PSS can be found, then,
Know 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 separately cube
Measure Indexes.Formula is
Calculated result is as shown in Fig. 5 figure.
(6) according to consensus standard, the 1st and the 6th subframe are fixed as downlink signal, and the 3rd subframe is fixed as uplink letter
Number.Therefore, using the 1st, 3, the difference of the cubic metric indexs of 6 subframes, choose decision threshold of its mean value as uplink and downlink；
(7) according to consensus standard, the switching point that uplink signal switchs to downlink signal is only possible to appear in 3 positions, i.e.,
The position of the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbol.Therefore, using having obtained
Cubic metric decision threshold respectively judges 3 subframes after special subframe.If the 1st subframe is lower than thresholding, the
2 and the 3rd sub- vertical frame dimension are in thresholding, then uplink signal switchs to the switching point of downlink signal at the end of the 1st subframe；If
1st and the 2nd subframe are lower than thresholding, and in thresholding, then the switching point that uplink signal switchs to downlink signal exists the 3rd sub- vertical frame dimension
At the end of 2nd subframe；If the 1st, the 2nd and the 3rd is below thresholding, uplink signal switchs to cutting for downlink signal
It changes o'clock at the end of the 3rd subframe.In order to improve the accuracy of detection, elimination interference can be to cube degree of continuous multiple frames
Magnitude is averaged, and is introduced state machine mode and locked to testing result.
Although specific embodiments of the present invention have been described above, those familiar with the art should be managed
Solution, we are merely exemplary described specific embodiment, rather than for the restriction to the scope of the present invention, it is familiar with this
The technical staff in field should be covered of the invention according to modification and variation equivalent made by spirit of the invention
In scope of the claimed protection.
Claims (5)
1. a kind of TD-LTE uplink and downlink timeslot matches detection method, characterized by the following steps:
Step 1 obtains TD-LTE base band time domain signal；
Step 2 detects in signal locating for PSS signal base band time domain signal progress operation using known primary synchronization signal
Position；
Step 3, according to consensus standard, subframe belonging to PSS symbol is the special subframe that downlink signal is converted to uplink signal, really
Make the switching point that downlink signal switchs to uplink signal；
Step 4, according to consensus standard, the position of PSS symbol 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 removes the 2nd special subframe and the 7th special subframe, calculates cubic metric index to remaining 8 subframes；
Step 6, according to consensus standard, the 1st and the 6th subframe are fixed as downlink signal, and the 3rd subframe is fixed as uplink letter
Number, using the 1st, 3, the difference of the cubic metric indexs of 6 subframes, determine uplink and downlink decision threshold；
Step 7, according to consensus standard, the 1st, the 2nd or the 3rd sub- frame end after special subframe where PSS symbol
Position respectively judges 3 subframes after special subframe, using obtained cubic metric decision threshold if low
In thresholding, as uplink signal.
2. a kind of TD-LTE uplink and downlink timeslot as described in claim 1 matches detection method, it is characterised in that: the step 1
Further specifically, being 30.72MHz with sample frequency, TD-LTE base band time domain signal is obtained.
3. a kind of TD-LTE uplink and downlink timeslot as described in claim 1 matches detection method, it is characterised in that: step 2 is into one
Step specifically: utilize known primary synchronization signal, computing cross-correlation is carried out to base band time domain signal, detect that PSS believes in signal
Number location.
4. a kind of TD-LTE uplink and downlink timeslot as described in claim 1 matches detection method, it is characterised in that: the step 7
Further specifically: the 1st, the 2nd or the 3rd sub- frame end according to consensus standard, after special subframe where PSS symbol
Position 3 subframes after special subframe are judged respectively using obtained cubic metric decision threshold, if the 1st
A subframe is lower than thresholding, and the 2nd and the 3rd sub- vertical frame dimension are in thresholding, then uplink signal switchs to the switching point of downlink signal at the 1st
At the end of subframe；If the 1st and the 2nd subframe are lower than thresholding, the 3rd sub- vertical frame dimension is in thresholding, then uplink signal switchs to downlink
The switching point of signal is at the end of the 2nd subframe；If the 1st, the 2nd and the 3rd is below thresholding, uplink signal switchs to
The switching point of downlink signal is at the end of the 3rd subframe.
5. a kind of TD-LTE uplink and downlink timeslot as described in claim 1 matches detection method, it is characterised in that: the step 6
Further specifically: according to consensus standard, the 1st and the 6th subframe are fixed as downlink signal, and the 3rd subframe is fixed as uplink
Signal chooses the cubic metric index average conduct of these three subframes using the 1st, 3, the difference of the cubic metric indexs of 6 subframes
The decision threshold of uplink and downlink.
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| CN110266429A (en) * | 2019-04-18 | 2019-09-20 | 四川大学 | A kind of signal frame structure detection method based on Higher Order Cumulants |
| CN111787547A (en) * | 2020-06-30 | 2020-10-16 | 三维通信股份有限公司 | Method and device for determining symbol type, storage medium and electronic device |
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| CN106792837A (en) * | 2017-02-22 | 2017-05-31 | 东南大学 | A kind of up-downgoing changing method of TD LTE systems |
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| CN105553532B (en) * | 2010-07-19 | 2018-10-12 | Lg电子株式会社 | The method and apparatus of emission control information in a wireless communication system |
| CN102130883B (en) * | 2011-04-15 | 2013-07-17 | 重庆邮电大学 | Time frequency synchronization method for time division long-term evolution (TD-LTE) system |
| CN104735771B (en) * | 2013-12-23 | 2018-04-27 | 福建京奥通信技术有限公司 | A kind of downlink synchronization system and method |
| WO2015126115A1 (en) * | 2014-02-22 | 2015-08-27 | 엘지전자(주) | Method for mitigating interference in wireless communication system supporting device-to-device communication, and device for same |
| CN105101389B (en) * | 2014-05-08 | 2020-04-03 | 索尼公司 | Method and arrangement in a wireless communication system |
| KR102367890B1 (en) * | 2014-09-25 | 2022-02-25 | 엘지전자 주식회사 | Synchronous signal transmission method in wireless communication system |
| CN106487472A (en) * | 2015-09-02 | 2017-03-08 | 中兴通讯股份有限公司 | The processing method and processing device of up-downgoing interference coordination |
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| CN102281638A (en) * | 2011-08-02 | 2011-12-14 | 电信科学技术研究院 | Method and equipment for scheduling slot |
| CN105846975A (en) * | 2015-01-13 | 2016-08-10 | 中国移动通信集团北京有限公司 | Method and device for configuring uplink sub-frame and downlink sub-frame |
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