CN101043749A - Detection of time division duplexing system circulation prefix types and cell initial search method - Google Patents
Detection of time division duplexing system circulation prefix types and cell initial search method Download PDFInfo
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Abstract
The disclosed detection method for the cycle prefix type in TD-SCDMA system comprises: 1. according to the PSC, obtaining the symbol timing and subzone mark; 2. according to PSC, extracting the SSC signal for assist SSC relative detection to obtain subzone group mark and frame timing message; 3. accordingly obtaining relative orthogonal sequence and pseudo-random sequence of the 2D pilot sequence to obtain the local pilot copy sequence for the 2D pilot sequence; and 4. extracting two pilot sequences to take correlation calculation and hereby decide the cycle prefix type. This invention overcomes the difficult in LTE of TD-SCDMA system.
Description
Technical field
The present invention relates to digital communicating field, particularly relate to detection method based on cyclic prefix type during in the tdd systems of orthogonal frequency division multiplexi.
Background technology
Current has two kinds of cyclic prefix type durings based on TD-SCDMA long evolving system LTE, is called regular circulation prefix types and extended cyclic prefix type.When travelling carriage initially inserted the sub-district, travelling carriage did not have the relevant information in any sub-district, comprises the cyclic prefix type during information that current area adopts.Therefore, when initial ranging, travelling carriage at first obtains information such as symbol timing, frame timing, cell identifier by synchronizing channel, also will obtain the information of cyclic prefix type during simultaneously, so that read the information of broadcast channel.
Carry out the detection of cyclic prefix type during in the process of sub-district, conventional method is the blind checking method that adopts based on auxiliary synchronous signal (SSC).Specifically, at first obtain symbol timing information according to master sync signal (PSC), from received signal, intercept two SSC signals then according to two kinds of cyclic prefix type during hypothesis, respectively these two SSC signals are carried out coherent detection, carrying out peak value then detects, the size of the two correlation peak relatively, thus detect the index of the SSC signal that transmitting terminal sends and the cyclic prefix type during that is adopted.
More than based on the Cyclic Prefix blind checking method of SSC signal, be based on such prerequisite: under two kinds of circulating prefix structure, the SSC signal has enough timing offset.
Fig. 1 is the frame structure schematic diagram of current TD-SCDMA long evolving system LTE.In this schematic diagram, primary synchronization channel P-SCH sends on special time slot DwPTS, and auxiliary synchronization channel S-SCH sends at last OFDM symbol of time slot #0.From this schematic diagram as can be seen, under two kinds of cyclic prefix type durings, PSC regularly and SSC regularly all align, that is to say that the symbol timing that travelling carriage can obtain according to PSC directly intercepts the SSC signal and need not to carry out the blind Detecting of cyclic prefix type during.But after having detected SSC and read before the broadcast channel, travelling carriage does not obtain the type information of Cyclic Prefix.Therefore traditional based on the SSC signal the Cyclic Prefix blind checking method and be not suitable for current TD-SCDMA long evolving system LTE because as previously mentioned, there is not timing offset in two kinds of cyclic prefix type during SSC signals.Therefore, the detection method of new cyclic prefix type during at current TD-SCDMA long evolving system LTE is essential.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of detection method based on cyclic prefix type during in the tdd systems of orthogonal frequency division multiplexi, with the technical problem of the detection method of the cyclic prefix type during that solves TD-SCDMA long evolving system LTE.
For solving following technical problem, the invention provides a kind of detection method of time division duplexing system circulation prefix types, described method comprises:
1), obtains symbol regularly, and cell identifier in the cell set according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain relevant informations such as cell group identifier and frame timing according to master sync signal PSC;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the local pilot tone copy sequence of two-dimension pilot frequency sequence;
4), from received signal, extract two pilot frequency sequences, carry out related operation with the local pilot tone copy sequence of two-dimension pilot frequency sequence, judge the type of Cyclic Prefix according to the size of correlation.
Wherein, described cyclic prefix type during comprises regular circulation prefix types and extended cyclic prefix type.
Wherein, in the described step 4, extracting pilot frequency sequence from received signal has following three kinds of modes:
Mode 1: first frequency pilot sign that only adopts time slot #0;
Mode 2: second frequency pilot sign that only adopts time slot #0;
Mode 3: first and second frequency pilot sign that adopt time slot #0 simultaneously.
In described step 4), described two pilot frequency sequences are meant two receiving sequences that obtain according to two kinds of Cyclic Prefix, described two products that pilot frequency sequence is orthogonal sequence and pseudo random sequence.
In described step 4), two pilot frequency sequences carry out relevant two correlations that obtain with local pilot tone copy sequence respectively, if pilot frequency sequence that obtains according to the regular circulation prefix types and local replica sequence correlation are greater than the correlation of pilot frequency sequence that obtains according to the extended cyclic prefix type and local replica sequence, then be judged to the regular circulation prefix types, otherwise, be judged to the extended cyclic prefix type.
The present invention also provides a kind of method of initial cell search, and described method comprises:
1), obtains symbol regularly, and cell identifier in the cell set according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain regularly relevant information of cell group identifier and frame according to master sync signal PSC symbol;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the local pilot tone copy sequence of two-dimension pilot frequency sequence;
4), from received signal, extract two pilot frequency sequences, carry out related operation with the local pilot tone copy sequence of two-dimension pilot frequency sequence, judge the type of Cyclic Prefix according to the size of correlation;
5), read broadcast channel;
6), Cell searching finishes.
The present invention adopt based on the Cyclic Prefix detection method of descending two-dimension pilot frequency compared with prior art, have following technique effect:
The first, simple, implementation complexity is low.Traditional cyclic prefix type during blind Detecting based on the SSC signal, need carry out coherent detection to all possible SSC sequence, the copy sequence of supposing the SSC sequence has 510, then need carry out 1020 related operations based on the cyclical patterns prefix blind Detecting of SSC signal.Computational complexity compares higher.And the present invention adopts the Cyclic Prefix blind checking method based on descending pilot frequency, owing to after the SSC detection finishes, carry out, this moment, the copy sequence of descending two-dimension pilot frequency sequence was known to travelling carriage, therefore, obtain two pilot frequency sequences according to two Cyclic Prefix hypothesis, carry out related operation with the copy pilot frequency sequence, only need 2 related operations just passable, computational complexity is relatively low.
The second, detecting reliability height.Two frequency pilot signs of time slot #0, under different cyclic prefix type durings, its time deviation is all enough big, the difference of the nearly 9.38 μ s of first frequency pilot sign, and the difference of second nearly 17.71 μ s of frequency pilot sign.Such time difference enough provides the reliable detection performance.In addition, if also detect antenna configuration information in the second step testing process of Cell searching, the pilot tone on so a plurality of antennas may be used to carry out cyclic prefix type during and detects, and detects performance and further improves.
Description of drawings
Fig. 1 is a structure of time slot schematic diagram in the TDD system.
Fig. 2 is the detection method flow chart of time division duplexing system circulation prefix types of the present invention.
Fig. 3 is one and comprises Cell searching flow chart of the present invention.
Embodiment
For ease of profound understanding the present invention, be example with structure of time slot shown in Figure 1 below, provide and comprise embodiments of the invention.
Technical standard TS36.211 according to current long evolving system LTE, cell identifier in the orthogonal code of the call number of master sync signal PSC, descending two-dimension pilot frequency sequence and the cell set, relation is one to one arranged between the three, and the pseudo noise code of cell group identifier that auxiliary synchronous signal SSC represents and two-dimension pilot frequency sequence also is to concern one to one.Therefore, when second step of Cell searching, after just SSC detected and finishes, the copy sequence of descending two-dimension pilot frequency sequence was known for travelling carriage.At this moment, travelling carriage can propose two pilot frequency sequences according to two kinds of cyclic prefix type during hypothesis from received signal, carry out related operation with known two-dimension pilot frequency copy sequence then, at last, judge the type of the Cyclic Prefix that transmitting terminal adopts according to the size of correlation.
Fig. 1 is a kind of frame structure schematic diagram of the tdd systems based on orthogonal frequency division multiplexi.In this schematic diagram, primary synchronization channel P-SCH sends on special time slot DwPTS, and auxiliary synchronization channel S-SCH sends at last OFDM symbol of time slot #0.From this schematic diagram as can be seen, under two kinds of cyclic prefix type durings, PSC regularly and SSC regularly all align, that is to say that the symbol timing that travelling carriage can obtain according to PSC directly intercepts the SSC signal and need not to carry out the blind Detecting of cyclic prefix type during.But after having detected SSC and read before the broadcast channel, travelling carriage does not obtain the type information of Cyclic Prefix.Therefore, traditional based on the SSC signal the Cyclic Prefix blind checking method and be not suitable for current TD-SCDMA long evolving system LTE because as previously mentioned, there is not timing offset in two kinds of cyclic prefix type during SSC signals.
The blind checking method of cyclic prefix type during is based on that such prerequisite carries out: under two kinds of cyclic prefix type durings, detected signal exists time enough poor in time.From the frame structure schematic diagram of the TD-SCDMA long evolving system LTE of Fig. 1 we as can be seen, first frequency pilot sign for time slot #0 under the different cyclic prefix type durings, has 288 * T
sThe time difference of ms (about 9.38 μ s), and, under the different cyclic prefix type durings, 544 * T is arranged for second frequency pilot sign of time slot #0
sThe time difference of ms (about 17.71 μ s).Such time deviation is enough for distinguishing different cyclic prefix type durings.
Therefore, as shown in Figure 2, the invention provides a kind of detection method of time division duplexing system circulation prefix types, described method comprises:
1), obtains symbol regularly, and cell identifier in the cell set according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain relevant informations such as cell group identifier and frame timing according to master sync signal PSC;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the local pilot tone copy sequence of complete two-dimension pilot frequency sequence;
4), according to regular circulation prefix and these two kinds of cyclic prefix type durings of extended cyclic prefix, from the signal that UE start back receives, extract two pilot frequency sequences, and two pilot frequency sequences that will extract respectively with the local pilot tone copy sequence of two-dimension pilot frequency sequence carry out related operation and obtain two correlations, judge the type of Cyclic Prefix according to the size of correlation.When the pilot frequency sequence that obtains according to the regular circulation prefix types and local replica sequence correlation correlation greater than pilot frequency sequence that obtains according to the extended cyclic prefix type and local replica sequence, then be judged to the regular circulation prefix types, otherwise, be judged to the extended cyclic prefix type.
Wherein, described two pilot frequency sequences are meant two receiving sequences that obtain according to two kinds of Cyclic Prefix, these two products that pilot frequency sequence is orthogonal sequence and pseudo random sequence.
Wherein, extract pilot frequency sequence and can adopt following three kinds of modes:
Mode 1: first frequency pilot sign that only adopts time slot #0;
Mode 2: second frequency pilot sign that only adopts time slot #0;
Mode 3: first and second frequency pilot sign that adopt time slot #0 simultaneously.
Fig. 3 has provided and has comprised Cell searching flow chart of the present invention, specifically describes as follows:
1), obtain symbol regularly, obtains cell identifier in the cell set simultaneously according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain relevant informations such as cell group identifier and frame timing according to master sync signal PSC;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the copy sequence of complete two-dimension pilot frequency sequence;
4), according to regular circulation prefix and these two kinds of cyclic prefix type durings of extended cyclic prefix, from the signal that UE start back receives, extract two pilot frequency sequences, and two pilot frequency sequences that will extract respectively with the local pilot tone copy sequence of two-dimension pilot frequency sequence carry out related operation and obtain two correlations, judge the type of Cyclic Prefix according to the size of correlation.When the pilot frequency sequence that obtains according to the regular circulation prefix types and local replica sequence correlation correlation greater than pilot frequency sequence that obtains according to the extended cyclic prefix type and local replica sequence, then be judged to the regular circulation prefix types, otherwise, be judged to the extended cyclic prefix type;
5), read broadcast channel;
6), Cell searching finishes.
Wherein, described two pilot frequency sequences are meant two receiving sequences that obtain according to two kinds of Cyclic Prefix, these two products that pilot frequency sequence is orthogonal sequence and pseudo random sequence.
Wherein, extract pilot frequency sequence and can adopt following three kinds of modes:
Mode 1: first frequency pilot sign that only adopts time slot #0;
Mode 2: second frequency pilot sign that only adopts time slot #0;
Mode 3: first and second frequency pilot sign that adopt time slot #0 simultaneously.
The Cyclic Prefix detection method based on descending two-dimension pilot frequency that the present invention adopts has following feature:
The first, simple, implementation complexity is low.Traditional cyclic prefix type during blind Detecting based on the SSC signal, need carry out coherent detection to all possible SSC sequence, the copy sequence of supposing the SSC sequence has 510, then need carry out 1020 related operations based on the cyclical patterns prefix blind Detecting of SSC signal.Computational complexity compares higher.And the present invention adopts the Cyclic Prefix blind checking method based on descending pilot frequency, owing to after the SSC detection finishes, carry out, this moment, the copy sequence of descending two-dimension pilot frequency sequence was known to travelling carriage, therefore, obtain two pilot frequency sequences according to two Cyclic Prefix hypothesis, carry out related operation with the copy pilot frequency sequence, only need 2 related operations just passable, computational complexity is relatively low.
The second, detecting reliability height.Two frequency pilot signs of time slot #0, under different cyclic prefix type durings, its time deviation is all enough big, the difference of the nearly 9.38 μ s of first frequency pilot sign, and the difference of second nearly 17.71 μ s of frequency pilot sign.Such time difference enough provides the reliable detection performance.In addition, if also detect antenna configuration information in the second step testing process of Cell searching, the pilot tone on so a plurality of antennas may be used to carry out cyclic prefix type during and detects, and detects performance and further improves.
Those skilled in the art that should be understood that the above only is preferred embodiment of the present invention, are not to be used for limiting practical range of the present invention; Everyly do equivalence according to the present invention and change and revise, all contained by claim of the present invention.
Claims (10)
1, a kind of detection method of time division duplexing system circulation prefix types, described method comprises:
1), obtains symbol regularly, and cell identifier in the cell set according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain regularly relevant information of cell group identifier and frame according to master sync signal PSC symbol;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the local pilot tone copy sequence of two-dimension pilot frequency sequence;
4), from received signal, extract two pilot frequency sequences, carry out related operation with the local pilot tone copy sequence of two-dimension pilot frequency sequence, judge the type of Cyclic Prefix according to the size of correlation.
2, method according to claim 1 is characterized in that: described cyclic prefix type during comprises regular circulation prefix types and extended cyclic prefix type.
3, method according to claim 1 is characterized in that: in the described step 4), extracting pilot frequency sequence from received signal has following three kinds of modes:
Mode 1: first frequency pilot sign that only adopts time slot #0;
Mode 2: second frequency pilot sign that only adopts time slot #0;
Mode 3: first and second frequency pilot sign that adopt time slot #0 simultaneously.
4, method according to claim 1 is characterized in that: in the described step 4), described two pilot frequency sequences are meant two receiving sequences that obtain according to two kinds of Cyclic Prefix, described two products that pilot frequency sequence is orthogonal sequence and pseudo random sequence.
5, method according to claim 2, it is characterized in that: in the described step 4), two pilot frequency sequences carry out relevant two correlations that obtain with local pilot tone copy sequence respectively, if pilot frequency sequence that obtains according to the regular circulation prefix types and local replica sequence correlation are greater than the correlation of pilot frequency sequence that obtains according to the extended cyclic prefix type and local replica sequence, then be judged to the regular circulation prefix types, otherwise, be judged to the extended cyclic prefix type.
6, a kind of method of initial cell search, described method comprises:
1), obtains symbol regularly, and cell identifier in the cell set according to master sync signal PSC;
2), regularly, extract auxiliary synchronous signal SSC symbol, carry out auxiliary synchronous signal SSC coherent detection, obtain regularly relevant information of cell group identifier and frame according to master sync signal PSC symbol;
3), obtain the orthogonal sequence and the pseudo random sequence of corresponding two-dimension pilot frequency sequence, by cell identifier in the cell set and cell group identifier thus obtain the local pilot tone copy sequence of two-dimension pilot frequency sequence;
4), from received signal, extract two pilot frequency sequences, carry out related operation with the local pilot tone copy sequence of two-dimension pilot frequency sequence, judge the type of Cyclic Prefix according to the size of correlation;
5), read broadcast channel;
6), Cell searching finishes.
7, method according to claim 6 is characterized in that: described cyclic prefix type during comprises regular circulation prefix types and extended cyclic prefix type.
8, method according to claim 6 is characterized in that: in the described step 4), extracting pilot frequency sequence from received signal has following three kinds of modes:
Mode 1: first frequency pilot sign that only adopts time slot #0;
Mode 2: second frequency pilot sign that only adopts time slot #0;
Mode 3: first and second frequency pilot sign that adopt time slot #0 simultaneously.
9, method according to claim 1 is characterized in that: in the described step 4), described two pilot frequency sequences are meant two receiving sequences that obtain according to two kinds of Cyclic Prefix, described two products that pilot frequency sequence is orthogonal sequence and pseudo random sequence.
10, method according to claim 7, it is characterized in that: in the described step 4), two pilot frequency sequences carry out relevant two correlations that obtain with local pilot tone copy sequence respectively, if pilot frequency sequence that obtains according to the regular circulation prefix types and local replica sequence correlation are greater than the correlation of pilot frequency sequence that obtains according to the extended cyclic prefix type and local replica sequence, then be judged to the regular circulation prefix types, otherwise, be judged to the extended cyclic prefix type.
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