CN102612051B - Random access detection method and random access detection device based on time division-long term evolution (TD-LTE) - Google Patents
Random access detection method and random access detection device based on time division-long term evolution (TD-LTE) Download PDFInfo
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Abstract
The invention relates to a random access detection method and a random access detection device based on time division-long term evolution (TD-LTE). The method comprises the following steps of: grouping a preset number of random access precursor time domain signals in received antenna data, which are used for frequency division multiplexing, in the same subframe and have the same precursor format, and simultaneously downsampling processing, thus obtaining a downsampled data sequence; and performing fast fourier transform (FFT) processing on the downsampled data sequence, and caching so as to extract a multi-frequency-point random access precursor frequency domain sequence. Under a time division duplex (TDD) mode, six paths of side-by-side random access signals are grouped and subjected to downsampling processing; six precursor sequences of occupied frequency domain resources are simultaneously extracted from the corresponding time domain resources and reduced into an 839-point or 139-point sequence; and the 839-point or 139-point sequence and a corresponding locally produced mother code sequence are subjected to relevant convolution processing, and the obtained relevant sequence is subjected to peak detection, so that detail information of a peak position is obtained, and the resource expense for random access detection is further saved.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of random access detecting method and device based on TD-LTE (TimeDivision-Synchronous Code Division Multiple Access Long Term Evolution, TD SDMA Long Term Evolution).
Background technology
According to 3GPP TS 36.211 agreements, under TDD (Time Division Duplexing, time division duplex) pattern, the form of system arbitrary access front signal in time domain as shown in Figure 1.The random access sequence of every kind of form consists of one or two preamble (leading) sequence, and for form 0,1,2,3, the length of preamble is 0.8ms, is the Zadoff-Chu sequence generation of 839 by length.For format 4, the length of preamble is 0.133ms, is the Zadoff-Chu sequence generation of 139 by length.
And on frequency domain, the shared spectrum width of random access preamble is equivalent to 6 RB, corresponding bandwidth is 1.08MHz.
And because the symbol sampler cycle of LTE system definition is 1/30720000s, i.e. the sample frequency of 30.72MHz.Therefore for random access preamble, there is serious over-sampling.Each preamble of random access form 0,1,2,3 has 24576 sampled points, and the preamble of format 4 has 4096 sampled points.For the complexity that reduces to calculate, first random access needs to carry out down-sampled operation, and the sampling number of the antenna preamble receiving is reduced to 839 or 139 the order of magnitude, and then carries out relevant treatment with the local community Zadoff-Chu sequence generating.
The essence that random access detects is the process that receiving sequence is relevant to the convolution of local female code sequence, because convolution correlation calculation complexity is higher, conventionally according to its principle, utilize fast fourier transform (FFT, Fast Fourier Transformation) relevant sequence is transformed into frequency domain and carries out dot product operation, result is transformed into time domain by invert fast fourier transformation (IFFI, Inverse Fast Fourier Transform) and obtains equivalent result.
According to 3GPP (The 3rd Generation Partnership Project, third generation partner program) TS 36.211 agreements, under tdd mode, can access maximum 6 preamble simultaneously, they take identical time-domain resource, and occupying different band resources, existing random access detection device once can only be processed by Dui Yi road accidental access signal, thereby has increased system resource overhead.
Summary of the invention
Main purpose of the present invention is to provide a kind of random access detecting method and device based on TD-LTE, is intended to save the resource overhead that random access detects.
In order to achieve the above object, the present invention proposes a kind of random access detecting method based on TD SDMA Long Term Evolution TD-LTE, comprising:
Random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving is also carried out down-sampled processing simultaneously, obtains down-sampled data sequence;
Described down-sampled data sequence is carried out to fast fourier transform FFT and process and buffer memory, complete the extraction of multifrequency point random access guiding frequency domain sequence.
Preferably, described predetermined quantity is 6; When random access guiding form is 0,1,4, described random access guiding time-domain signal comprises 6 targeting sequencings; When random access guiding form is 2,3, described random access guiding time-domain signal comprises 12 targeting sequencings.
Preferably, the described random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving is also carried out down-sampled processing simultaneously, and the step that obtains down-sampled data sequence comprises:
When random access guiding form is 0,1,4, described random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled data sequences; Or
When random access guiding form is 2,3, described random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Described down-sampled data sequence is carried out to buffer memory.
Preferably, the step that completes the extraction of multifrequency point random access guiding frequency domain sequence described in also comprises afterwards:
It is relevant that leading frequency domain sequence after FFT is processed and a local female yard of sequence are carried out, and obtains correlated series;
Described correlated series is carried out to the invert fast fourier transformation IFFT processing that correspondence is counted;
Leading time domain sequences after IFFT is processed merges processing;
Extract the positional information of the peak value that merges the leading time domain sequences after processing.
Preferably, it is relevant that described leading frequency domain sequence after FFT is processed and a local female yard of sequence are carried out, and the step that obtains correlated series comprises:
When the leading form of described leading frequency domain sequence is 0,1 or 4, from data buffer storage, takes out a described leading frequency domain sequence at every turn and carry out relevant to local female code sequence; Or when the leading form of described leading frequency domain sequence is 2 or 3, from data buffer storage, takes out two described leading frequency domain sequences at every turn and carry out relevant to local female code sequence.
The present invention also proposes a kind of random access detection device based on TD-LTE, comprising:
Down-sampled module is also carried out down-sampled processing for the random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in the same subframe of antenna data receiving simultaneously, obtains down-sampled data sequence;
FFT module, processes and buffer memory for described down-sampled data sequence being carried out to FFT, completes the extraction of multifrequency point random access guiding frequency domain sequence.
Preferably, described predetermined quantity is 6; When random access guiding form is 0,1,4, described random access guiding time-domain signal comprises 6 targeting sequencings; When random access guiding form is 2,3, described random access guiding time-domain signal comprises 12 targeting sequencings.
Preferably, described down-sampled module comprises:
Divide into groups down-sampled unit, for when random access guiding form is 0,1,4, described random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled data sequences; Or when random access guiding form is 2,3, described random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Data buffer storage unit, for carrying out buffer memory to described down-sampled data sequence.
Preferably, this device also comprises:
Correlation module, relevant for the female code of the leading frequency domain sequence after a FFT processing and this locality sequence is carried out, obtain correlated series;
IFFT module, the IFFT processing of counting for described correlated series being carried out to correspondence;
Merge module, for the leading time domain sequences after IFFT is processed, merge processing;
Peak information extraction modules, for extracting the positional information of the peak value that merges the leading time domain sequences after processing.
Preferably, when the leading form of described leading frequency domain sequence is 0,1 or 4, from data buffer storage, takes out a described leading frequency domain sequence at every turn and carry out relevant to local female code sequence; Or when the leading form of described leading frequency domain sequence is 2 or 3, from data buffer storage, takes out two described leading frequency domain sequences at every turn and carry out relevant to local female code sequence.
A kind of random access detecting method and device based on TD-LTE that the present invention proposes, realized under tdd mode, complete grouping the down-sampled processing simultaneously of the parallel accidental access signal in 6 tunnels of frequency division multiplexing in same subframe simultaneously, in corresponding time-domain resource, extract 6 preamble of shared frequency domain resource simultaneously, and be reduced into or sequence at 839 at 139, carry out convolution relevant treatment with female code sequence that corresponding this locality produces, and the correlated series obtaining is carried out to peak value detection, obtain the details of peak, thereby saved the resource overhead that random access detects.
Accompanying drawing explanation
Fig. 1 is random access leader sequence form schematic diagram;
Fig. 2 is the random access detecting method one embodiment schematic flow sheet that the present invention is based on TD-LTE;
Fig. 3 the present invention is based on the down-sampled schematic diagram that divides into groups in random access detecting method one embodiment of TD-LTE;
Fig. 4 the present invention is based in random access detecting method one embodiment of TD-LTE the random access guiding time-domain signal grouping of the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving and carries out down-sampled processing simultaneously, obtains the schematic flow sheet of down-sampled data sequence;
Fig. 5 is another embodiment schematic flow sheet of random access detecting method that the present invention is based on TD-LTE;
Fig. 6 is the random access detection device one example structure schematic diagram that the present invention is based on TD-LTE;
Fig. 7 is the structural representation that the present invention is based on down-sampled module in random access detection device one embodiment of TD-LTE;
Fig. 8 is another example structure schematic diagram of random access detection device that the present invention is based on TD-LTE.
In order to make technical scheme of the present invention clearer, clear, below in conjunction with accompanying drawing, be described in further detail.
Embodiment
Solution for embodiment of the invention is mainly to realize under tdd mode, complete the processing of the parallel accidental access signal in 6 tunnels simultaneously, in corresponding time-domain resource, extract 6 preamble of shared frequency domain resource simultaneously, and be reduced into or sequence at 839 at 139, carry out convolution relevant treatment with the Zadoff-Chu sequence that corresponding this locality produces, the correlated series obtaining is carried out to peak value detection, obtain the details of peak.
As shown in Figure 2, one embodiment of the invention proposes a kind of random access detecting method based on TD-LTE, comprising:
Step S101 also carries out down-sampled processing to the random access guiding time-domain signal grouping of the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving simultaneously, obtains down-sampled data sequence;
The 6 road random access guiding time-domain signals that need to carry out when the present embodiment accesses for the random access sequence in different frequency domain resource simultaneously carry out that digital spectrum is moved and the down-sampled processing of dividing into groups simultaneously, by the down-sampled operation of dividing into groups, the preamble data volume of time domain oversampling is reduced greatly.
6 road random access guiding time-domain signals of above-mentioned parallel processing are same leading form, and the random access guiding time-domain signal of each leading form consists of 6 targeting sequencings or 12 targeting sequencings.
Particularly, in down-sampled process, the random access guiding time-domain signal of predetermined quantity (being 6 tunnels in the present embodiment) is carried out to packet transaction, when the leading form of the 6 road random access guiding time-domain signals of processing is 0,1,4, random access guiding time-domain signal comprises 6 targeting sequencings, random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled sequences; When the leading form of the 6 road random access guiding time-domain signals of processing is 2,3, random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled sequences.Make like this to include in each group 3 targeting sequencings.In carrying out the process of down-sampled and follow-up fast fourier transform, the targeting sequencing in group is not distinguished.
For 0,1,2,3, one down-sampled sequence length of leading form, be 3072; For leading format 4, a down-sampled sequence length is 512.After down-sampled being disposed, all down-sampled sequences are carried out to data buffer storage.
Step S102, carries out FFT to down-sampled data sequence and processes and buffer memory, completes the extraction of multifrequency point random access guiding frequency domain sequence.
To down-sampled data, can carry out the FFT conversion of 3072, by FFT, convert, the large convolution correlated process of amount of calculation can be converted to the dot product process of frequency domain sequence.
Down-sampled sequence in data buffer storage is once carried out to FFT conversion, and the leading frequency domain sequence after the FFT conversion obtaining is once deposited back in data buffer storage.Because down-sampled sequence has 3072 and 512 two kind of length, leading frequency domain sequence also has two kinds of length, the leading frequency domain sequence of 3072 is corresponding to random access guiding form 0,1,2,3, the leading frequency domain sequence of 512 is corresponding to leading format 4, the frequency domain value that comprises 3 preamble access sequences on each leading frequency domain sequence, length is 839 or 139.
By above-mentioned steps S101 and step S102, completed the extraction of different frequency domain resource access sequences in identical time-domain resource on antenna, and obtained the frequency domain sequence of they correspondences, a preamble sequence counter Pcnt in data buffer storage now, the number of Pcnt should be 3 times of leading frequency domain sequence number.
As shown in Figure 3, for random access guiding form, be 0,1,4 o'clock, as previously mentioned, the down-sampled processing of once dividing into groups, can obtain 2 groups of data sequences in the middle of data buffer storage unit; For random access guiding form 2,3, according to structure as shown in Figure 3, carry out the down-sampled processing of twice grouping, can obtain 4 groups of data sequences in the middle of data buffer storage unit, wherein every group includes 3 targeting sequencings.
From data buffer storage unit, the data sequence in all groups is taken out successively, carry out fast fourier transform, the output data that obtain are deposited and are got back in the middle of data buffer storage unit again.Wherein, the data sequence of a group is carried out Fourier transform one time, and the output data that obtain remain a group, and size is identical with the size of input group.
Through this time operation, in each group, include 3 leading frequency domain sequences, 3 leading frequency domain sequences in group only in interior group by data buffer storage unit the memory location of data just can distinguish.
This shows, only used the down-sampled handling process that walks abreast of two-way as shown in Figure 3, just completed the down-sampled operation of maximum 6 road random access leader sequences.By 4 fast fourier transform (leading form 2,3 has been divided into 4 groups), just 12 targeting sequencing preamble have been transformed to frequency domain at most, obtained maximum 12 leading frequency domain sequences.
As shown in Figure 4, above-mentioned steps S101 comprises:
Step S1011, when random access guiding form is 0,1,4, is divided into 2 groups by random access guiding time-domain signal and carries out down-sampled processing simultaneously, obtains 2 groups of down-sampled data sequences; Or when random access guiding form is 2,3, random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Step S1012, carries out buffer memory to down-sampled data sequence.
As shown in Figure 5, another embodiment of the present invention proposes a kind of random access detecting method based on TD-LTE, comprising:
Step S301 also carries out down-sampled processing to the random access guiding time-domain signal grouping of the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving simultaneously, obtains down-sampled data sequence;
Step S302, carries out FFT to down-sampled data sequence and processes and buffer memory, completes the extraction of multifrequency point random access leader sequence;
Above-mentioned steps S301 and step S302 are corresponding identical with step S101 in above-described embodiment and step S102, do not repeat them here.
Step S303, it is relevant that the leading frequency domain sequence after FFT is processed and a local female yard of sequence are carried out, and obtains correlated series;
In order to complete the further detection of random access guiding time-domain signal, it is relevant that the leading frequency domain sequence after FFT need to being processed and a local female code sequence be carried out, to correlated series is merged and processed and peak value detection.
Particularly, the leading form of current pilot territory sequence is 0,1 or 4 o'clock, takes out a leading frequency domain sequence at every turn and carry out relevant to a local female code sequence from data buffer storage; Or the leading form of current pilot territory sequence is 2 or 3 o'clock, from data buffer storage, takes out two leading frequency domain sequences at every turn and carry out relevant to a local female code sequence.Finally, leading frequency domain sequences all in data buffer storage and local female code sequence are carried out to relevant treatment.
Relevant process is exactly the process that correspondence is counted and multiplied each other, and the sequence of 839 or 139 length that obtain obtains 1536 or the correlated series of 256 length through mending 0.
Step S304, carries out to correlated series the IFFT processing that correspondence is counted;
Correlated series is carried out to the IFFT conversion of 1536, obtain leading time domain sequences.
Step S305, the leading time domain sequences after IFFT is processed merges processing;
The IFFT output of all antennas is merged to processing, and for form 2,3, two correlated serieses after antenna merges still need to merge becomes a correlated series, then forms single channel correlated series, finally can carry out the detection of the positional information of peak value.
Step S306, extraction merges the positional information of the peak value of the leading time domain sequences after processing.
The time domain sequences obtaining after merging is carried out to peak value detection, find the positional information of each peak value.
Above process flowing water carries out, until the Pcnt storing in data buffer storage leading frequency domain sequence is disposed completely.Completing random access detects.
The present embodiment is under tdd mode, the 6 road random access guiding time domain sequences groupings that random access sequence in different frequency domain resource need to carry out while accessing simultaneously are also carried out down-sampled processing simultaneously, and fast fourier transform and inversion process process, only by the parallel down-sampled handling process of two-way as shown in Figure 3, just completed the down-sampled operation of maximum 6 road random access leader sequences, and at most by 4 fast fourier transform (leading forms 2, 3 have been divided into 4 groups), just 12 targeting sequencing preamble have been transformed to frequency domain, maximum 12 leading frequency domain sequences have been obtained, thereby by lower resource overhead, realized the special processing of random access under TD-LTE.
As shown in Figure 6, one embodiment of the invention proposes a kind of random access detection device based on TD-LTE, comprising: down-sampled module 401 and FFT module 402, wherein:
Down-sampled module 401 is also carried out down-sampled processing for the random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in the same subframe of antenna data receiving simultaneously, obtains down-sampled data sequence;
The 6 road random access guiding time-domain signals that need to carry out when the present embodiment accesses for the random access sequence in different frequency domain resource simultaneously carry out that digital spectrum is moved and the down-sampled processing of dividing into groups simultaneously, by the down-sampled operation of dividing into groups, the preamble data volume of time domain oversampling is reduced greatly.
6 road random access guiding time-domain signals of above-mentioned parallel processing are same leading form, and the random access guiding time-domain signal of each leading form consists of 6 targeting sequencings or 12 targeting sequencing sequences.
Particularly, in down-sampled process, the random access guiding time-domain signal of predetermined quantity (being 6 tunnels in the present embodiment) is carried out to packet transaction, when the leading form of the 6 road random access guiding time-domain signals of processing is 0,1,4, random access guiding time-domain signal comprises 6 targeting sequencings, random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled sequences; When the leading form of the 6 road random access guiding time-domain signals of processing is 2,3, random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled sequences.Make like this to include in each group 3 targeting sequencings.In carrying out the process of down-sampled and follow-up fast fourier transform, the targeting sequencing in group is not distinguished.
For 0,1,2,3, one down-sampled sequence length of leading form, be 3072; For leading format 4, a down-sampled sequence length is 512.After down-sampled being disposed, all down-sampled sequences are carried out to data buffer storage.
FFT module 402, processes and buffer memory for down-sampled data sequence being carried out to FFT, completes the extraction of multifrequency point random access leader sequence.
To down-sampled data, can carry out the FFT conversion of 3072, by FFT, convert, the large convolution correlated process of amount of calculation can be converted to the dot product process of frequency domain sequence.
Down-sampled sequence in data buffer storage is once sent into FFT module 402 and carry out FFT conversion, and the leading frequency domain sequence after the FFT conversion obtaining is once deposited back in data buffer storage.Because down-sampled sequence has 3072 and 512 two kind of length, leading frequency domain sequence also has two kinds of length, the leading frequency domain sequence of 3072 is corresponding to random access guiding form 0,1,2,3, the leading frequency domain sequence of 512 is corresponding to leading format 4, the frequency domain value that comprises 3 preamble access sequences on each leading frequency domain sequence, length is 839 or 139.
Pass through said process, completed the extraction of different frequency domain resource access sequences in identical time-domain resource on antenna, and obtained the frequency domain sequence of they correspondences, and a preamble sequence counter Pcnt in data buffer storage now, the number of Pcnt should be 3 times of leading frequency domain sequence number.
As shown in Figure 3, for random access guiding form, be 0,1,4 o'clock, as previously mentioned, the down-sampled processing of once dividing into groups, can obtain 2 groups of data sequences in the middle of data buffer storage unit; For random access guiding form 2,3, according to structure as shown in Figure 3, carry out the down-sampled processing of twice grouping, can obtain 4 groups of data sequences in the middle of data buffer storage unit, wherein every group includes 3 targeting sequencings.
From data buffer storage unit, the data sequence in all groups is taken out successively, carry out fast fourier transform, the output data that obtain are deposited and are got back in the middle of data buffer storage unit again.Wherein, the data sequence of a group is carried out Fourier transform one time, and the output data that obtain remain a group, and size is identical with the size of input group.
Through this time operation, in each group, include 3 leading frequency domain sequences, 3 leading frequency domain sequences in group only in interior group by data buffer storage unit the memory location of data just can distinguish.
This shows, only used the down-sampled handling process that walks abreast of two-way as shown in Figure 3, just completed the down-sampled operation of maximum 6 road random access leader sequences.By 4 fast fourier transform (leading form 2,3 has been divided into 4 groups), just 12 targeting sequencing preamble have been transformed to frequency domain at most, obtained maximum 12 leading frequency domain sequences.
As shown in Figure 7, down-sampled module 401 comprises: divide into groups down-sampled unit 4011 and data buffer storage unit 4012, wherein:
Divide into groups down-sampled unit 4011, for when random access guiding form is 0,1,4, random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled data sequences; Or when random access guiding form is 2,3, random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Data buffer storage unit 4012, for carrying out buffer memory to down-sampled data sequence.
As shown in Figure 8, another embodiment of the present invention proposes a kind of random access detection device based on TD-LTE, comprise: down-sampled module 501, FFT module 502, correlation module 503, IFFT module 504, merging module 505 and peak information extraction modules 506, wherein:
Down-sampled module 501 is also carried out down-sampled processing for the random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in the same subframe of antenna data receiving simultaneously, obtains down-sampled data sequence;
FFT module 502, processes and buffer memory for down-sampled data sequence being carried out to FFT, completes the extraction of multifrequency point random access leader sequence.
Above-mentioned down-sampled module 501 and FFT module 502 are corresponding identical with down-sampled module 401 and FFT module 402 functional structures in above-described embodiment, do not repeat them here.
Correlation module 503, relevant for the female code of the leading frequency domain sequence after a FFT processing and this locality sequence is carried out, obtain correlated series;
In order to complete the further detection of random access guiding time-domain signal, the present embodiment carries out the female code of the leading frequency domain sequence after a FFT processing and this locality sequence by correlation module 503 relevant, to correlated series is merged and processed and peak value detection.
Particularly, the leading form of current pilot territory sequence is 0,1 or 4 o'clock, takes out a leading frequency domain sequence at every turn and carry out relevant to a local female code sequence from data buffer storage; Or the leading form of current pilot territory sequence is 2 or 3 o'clock, from data buffer storage, takes out two leading frequency domain sequences at every turn and carry out relevant to a local female code sequence.Finally, leading frequency domain sequences all in data buffer storage and local female code sequence are carried out to relevant treatment.
Relevant process is exactly the process that correspondence is counted and multiplied each other, and the sequence of 839 or 139 length that obtain obtains 1536 or the correlated series of 256 length through mending 0.
IFFT module 504, the IFFT processing of counting for correlated series being carried out to correspondence;
Correlated series is carried out to the IFFT conversion of 1536, obtain leading time domain sequences.
Merge module 505, for the leading time domain sequences after IFFT is processed, merge processing;
Merge module 505 the IFFT output of all antennas is merged to processing, for form 2,3, two correlated serieses after antenna merges still need to merge becomes a correlated series, then forms single channel correlated series, finally can carry out the detection of the positional information of peak value.
Peak information extraction modules 506, for extracting the positional information of the peak value that merges the leading time domain sequences after processing.
Peak information extraction modules 506 is carried out peak value detection by the time domain sequences obtaining after merging, and finds the positional information of each peak value.
Above process flowing water carries out, until the Pcnt storing in data buffer storage leading frequency domain sequence is disposed completely.Completing random access detects.
Random access detecting method and the device of the embodiment of the present invention based on TD-LTE, realized under tdd mode, complete the grouping of the parallel random access guiding time-domain signal in 6 tunnels simultaneously and carry out down-sampled processing simultaneously, and fast fourier transform and inversion process process, in corresponding time-domain resource, extract 6 preamble of shared frequency domain resource simultaneously, and be reduced into or sequence at 839 at 139, carry out convolution relevant treatment with female code sequence that corresponding this locality produces, and the correlated series obtaining is carried out to peak value detection, obtain the details of peak, only by the parallel down-sampled handling process of two-way as shown in Figure 3, just completed the down-sampled operation of maximum 6 road random access leader sequences, and at most by 4 fast fourier transform (leading forms 2, 3 have been divided into 4 groups), just 12 targeting sequencing preamble have been transformed to frequency domain, maximum 12 leading frequency domain sequences have been obtained, thereby saved the resource overhead that random access detects.
The foregoing is only the preferred embodiments of the present invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. the random access detecting method based on TD SDMA Long Term Evolution TD-LTE, is characterized in that, comprising:
Random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in same subframe in the antenna data receiving is also carried out down-sampled processing simultaneously, obtains down-sampled data sequence; Specifically comprise: when random access guiding form is 0,1,4, described random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled data sequences; Or when random access guiding form is 2,3, described random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Described down-sampled data sequence is carried out to fast fourier transform FFT and process and buffer memory, complete the extraction of multifrequency point random access guiding frequency domain sequence.
2. method according to claim 1, is characterized in that, described predetermined quantity is 6; When random access guiding form is 0,1,4, described random access guiding time-domain signal comprises 6 targeting sequencings; When random access guiding form is 2,3, described random access guiding time-domain signal comprises 12 targeting sequencings.
3. method according to claim 1, is characterized in that, described in also comprise after completing the step of extraction of multifrequency point random access guiding frequency domain sequence:
It is relevant that leading frequency domain sequence after FFT is processed and a local female yard of sequence are carried out, and obtains correlated series;
Described correlated series is carried out to the invert fast fourier transformation IFFT processing that correspondence is counted;
Leading time domain sequences after IFFT is processed merges processing;
Extract the positional information of the peak value that merges the leading time domain sequences after processing.
4. method according to claim 3, is characterized in that, it is relevant that described leading frequency domain sequence after FFT is processed and a local female yard of sequence are carried out, and the step that obtains correlated series comprises:
When the leading form of described leading frequency domain sequence is 0,1 or 4, from data buffer storage, takes out a described leading frequency domain sequence at every turn and carry out relevant to local female code sequence; Or when the leading form of described leading frequency domain sequence is 2 or 3, from data buffer storage, takes out two described leading frequency domain sequences at every turn and carry out relevant to local female code sequence.
5. the random access detection device based on TD-LTE, is characterized in that, comprising:
Down-sampled module is also carried out down-sampled processing for the random access guiding time-domain signal grouping to the same leading form of the predetermined quantity of frequency division multiplexing in the same subframe of antenna data receiving simultaneously, obtains down-sampled data sequence; Described down-sampled module comprises:
Divide into groups down-sampled unit, for when random access guiding form is 0,1,4, described random access guiding time-domain signal is divided into 2 groups and carries out down-sampled processing simultaneously, obtain 2 groups of down-sampled data sequences; Or when random access guiding form is 2,3, described random access guiding time-domain signal is divided into 4 groups and carries out down-sampled processing simultaneously, obtain 4 groups of down-sampled data sequences;
Data buffer storage unit, for carrying out buffer memory to described down-sampled data sequence;
FFT module, processes and buffer memory for described down-sampled data sequence being carried out to FFT, completes the extraction of multifrequency point random access guiding frequency domain sequence.
6. device according to claim 5, is characterized in that, described predetermined quantity is 6; When random access guiding form is 0,1,4, described random access guiding time-domain signal comprises 6 targeting sequencings; When random access guiding form is 2,3, described random access guiding time-domain signal comprises 12 targeting sequencings.
7. device according to claim 5, is characterized in that, also comprises:
Correlation module, relevant for the female code of the leading frequency domain sequence after a FFT processing and this locality sequence is carried out, obtain correlated series;
IFFT module, the IFFT processing of counting for described correlated series being carried out to correspondence;
Merge module, for the leading time domain sequences after IFFT is processed, merge processing;
Peak information extraction modules, for extracting the positional information of the peak value that merges the leading time domain sequences after processing.
8. device according to claim 7, is characterized in that, when the leading form of described leading frequency domain sequence is 0,1 or 4, takes out a described leading frequency domain sequence at every turn and carry out relevant to local female code sequence from data buffer storage; Or when the leading form of described leading frequency domain sequence is 2 or 3, from data buffer storage, takes out two described leading frequency domain sequences at every turn and carry out relevant to local female code sequence.
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| CN110198567B (en) * | 2018-02-26 | 2021-11-26 | 深圳市中兴微电子技术有限公司 | Random access detection method and device |
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| CN112689335A (en) * | 2019-10-18 | 2021-04-20 | 深圳市中兴微电子技术有限公司 | Data merging method and device for random access channel |
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