CN1640037A - A method and apparatus for detecting original frame boundary based on a LAS-CDMA system - Google Patents
A method and apparatus for detecting original frame boundary based on a LAS-CDMA system Download PDFInfo
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Abstract
The present invention provides a method and apparatus for detecting original frame boundary based on a LAS-CDMA system, by LS match filter, extracting mode and square for the input basedband signals, then the signals are divided into two routes; delaying and LA matching one of the said two routes signals, performing the energy mergence of LS symbols; making a correlation lobes detection for the other signal of the said two routes signals, detecting if a possible down-link synchronistic physical channel exists or not on the time delay; after the correlation lobes detection, exporting multiplex signals or one route signal, which are respectively the correlation lobes detection values exported below different thresholds; multiplying the output signal after La match with the output multiplex signal respectively after the correlation lobes detection, when only a route signal is exported from the correlation lobes detector, it is necessary that only this signal is multiplied with the output signal after LA match, and making a frame bondary detection for the multiplied signal, obtaining the original frame boundary output. So the performance of the original frame boundary detection can be improved.
Description
A kind of initial frame boundary detection method and device based on LAS-cdma system
Technical field
The present invention relates to CDMA technology, the down-going synchronous subsystem of its more particularly to LAS-CDMA system physical layer, is concretely a kind of initial frame boundary detection method and device based on LAS- C Should A systems.Background technology
In the initial frame boundary detection of the down-going synchronous subsystem of LAS- cdma system physical layers, by extracting relevant peaks with the wave filter that all cell downlink synchronization physical channels are matched, frame boundary detection is realized.Because all cells use different bipolarity LA polarity sequences, down-going synchronous matched filter can only carry out matched filtering on time slot, and the incoherent merging of LA is carried out on whole down-going synchronous physical channel.Because down-going synchronous physical channel and downlink traffic channel are the time-divisions, it is possible to design detection algorithm for this point, to improve the performance of initial frame boundary detection.The content of the invention
It is an object of the invention to provide a kind of initial frame boundary detection method and device based on LAS- cdma systems, the performance to improve initial frame boundary detection.
The technical scheme is that：
A kind of initial frame boundary detection method based on LAS- cdma systems, it is characterised in that comprise the following steps：
Baseband signal to input carries out LS matched filterings, modulus square, is then divided into two paths of signals；Signal all the way in the two paths of signals is postponed, LA is matched, realize that the energy of LS symbols merges；
Another road signal in the two paths of signals is subjected to related blob detection, detects and whether there is possible down-going synchronous physical channel in the time delay；
The correlation exported after related blob detection under output multi-channel or signal all the way, respectively different thresholdings
Blob detection value；The signal exported after LA is matched is multiplied respectively with the multiple signals exported after related blob detection, when related Peak detector only exports signal all the way, only need LA match after the signal that exports and this signal multiplication all the way, and the signal after multiplication is subjected to frame boundary detection, obtain initial frame boundary output.
The described baseband signal to input carries out LS matched filterings, modulus square and comprised the following steps：Definition-^;
If LS code waveforms are(t) = cRe (t) + jclm (t) , 0≤t≤ 72TC；
The impulse Response Function of LS code matched filterings is：
h (t) = (t) + jhlm (t) =
= cRe (Γ - t) - jclm (T - 1) , 0≤t≤72Tc, T=12T is taken hereC；
Corresponding to input signal=+, output signal is：
s {t) ® h {t)
= [½e (0 + jSlm (01 ® [ ¾e (0 + J m (t)]
= ¾e (0 ® (t) - Slm (t) ® hlm (t) + j[SRe (t) ® hlm (t) + Slm (t) ® hRe(t)]；
To plural a+jb, a+jbf=a2 + 62。
Described LA matchings refer to：LA matching modules are the delay lines that a segment length is down-going synchronous physical channel length, and realize that the energy of LS symbols merges using adder.
Described related blob detection refers to：Delay disposal, moving average processing, wealthy value processing and LA matching treatments are carried out to the signal from LS code matched filters, detection output is obtained.
Described frame boundary detection refers to：Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Energy maximum value for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel.
Described frame boundary detection also includes：
Frame boundary detector will be completed in whole module initialization, LS code matched filters, LA matching and initialization complete, into steady-working state after start working；
Wherein：The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel,
Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Frame boundary detector will be detected until threshold value Cn successively, otherwise it is assumed that not detecting any synchronizing channel；Energy maximum value position is just blunt to can be obtained by frame boundaries position according to frame structure after treatment.Whole frame boundary detector will work untill detecting synchronizing channel always.
Be described in further detail for：The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of wealthy value C2 are detected, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；
Frame boundary detector will be detected until threshold value Cn successively, otherwise it is assumed that not detecting any synchronizing channel（Cn herein>C3>C2>Cl );Whole frame boundary detector will work untill detecting synchronizing channel always.
Method of the present invention, it is characterised in that further comprising the steps of：
Signal all the way in the two paths of signals is postponed, LA matching treatments, then carry out multi-frame accumulation processing.
Described multi-frame accumulation refers to：Input in each frame time is added on frame in correspondence position, the end value after M frames add up after M frame times, is being inputted.
When using multi-frame accumulation：Described frame boundary detection includes：Frame boundary detector will be completed in whole module initialization, LS code matched filters, and LA matchings and related Peak detector have initialized completions, into steady-working state M frames after start-up operation；
Wherein：Frame boundary detector is operated in 4fc speed；Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Amplitude maxima for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel；
The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Frame boundary detector will be detected until threshold value Cn successively, otherwise it is assumed that not detecting any synchronizing channel；Energy maximum value position can be obtained by frame boundaries position according to frame structure after treatment.Whole frame boundary detector will work untill detecting synchronizing channel always.
The initial frame boundary detection means that LAS-C draws A (TD-LAS) system is based on present invention also offers a kind of, including：LS matched filters, modulus squaring module, Postponement module, LA matching modules, related Peak detector, frame boundary detector；
The baseband signal of input carries out LS matched filterings first, and modulus square is divided into two-way；LA matchings are carried out all the way；Another road feeding correlation Peak detector, detects and whether there is possible down-going synchronous physical channel in the time delay；Related Peak detector exports the relevant peaks detected value exported under 3 road signals, respectively different thresholdings；If being output as 1, down-going synchronous physical channel is there may be in the time delay；0 is output as, then descending synchronization physical channels are not present in the time delay；
The delay of Postponement module makes LS matched filterings equal with the additional processing delay of related Peak detector two paths of signals；
LA matching modules are exported into the multichannel exported with related Peak detector or signal is multiplied respectively all the way, frame boundary detector is sent into, obtains initial frame boundary output.
The input signal of described LS matched filters is：Baseband digital signal；
If definition _ /=7^1；
If LS codes waveform is 2 t)=cRe (t) + jcIm (t) , 0≤t≤ 72TC；
The impulse Response Function of LS matched filters is：
h it) = Re (i) +
= cRe (T -t) - jclm(T-t) , 0≤t≤72Tc, Τ=727 are taken here；；
Corresponding to input signal (t)=(t)+jslm(t), output signal is：
= (0 + jslm (t)] ® [ARe (t) + ji m (t)]
= (0 ® e (0 - n (0 ® J m (t) + j[sKe (t) ® kim (t) + Slm (t) ® hRe(t)]；
To plural Ω+jb, | α+jbf=a2 +62。
Described LA matching modules include：Adder；LA matching modules are that a segment length is the delay line of down-going synchronous physical channel length, and adder can be used to realize that the energy of LS symbols merges.
Described related Peak detector includes：
Moving average modules A;
Postponement module A;
Explain value modules A:Its function is：If the input that self-dalay modules A is come, which is more than K1, is multiplied by the input come from moving average modules A, 0 is exported, the input that self-dalay modules A is come otherwise is exported；
Postponement module B;
Moving average module B;
Threshold module B:Its function is：If the input from moving average module B is multiplied by self-dalay module B input more than K2,1 is exported, 0 is otherwise exported;
If being more than Thl from the input of LA matching modules, threshold module C1 is output as 1, and otherwise threshold module C1 is output as 0;If the input of LA matching modules is more than Th2, threshold module C2 is output as 1, and otherwise wealthy value module C2 is output as 0;If being more than Th3 from the input of LA matching modules, threshold module C3 is output as 1, and otherwise threshold module C3 is output as 0;If being more than Thn from the input of LA matching modules, threshold module Cn is output as 1, and otherwise value module C3 is output as 0.Thl ＞ Th herein2>Th3>...>Thn。
Described frame boundary detector includes：Frame boundary detector will be completed in whole module initialization, LS code matched filters, and LA is matched to start working with after related Peak detector steady operation；
Wherein：The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detection
To synchronizing channel, Energy maximum value position is exported；Frame boundary detector will be detected until value of making a noise successively
Cn, otherwise it is assumed that not detecting any synchronizing channel；Energy maximum value position according to can be obtained by frame boundaries position after treatment.Whole frame boundary detector will work untill detecting synchronizing channel always.
Device of the present invention, wherein also including：Multi-frame accumulation module；
Signal all the way in the two paths of signals is postponed, LA matching treatments, then carry out multi-frame accumulation processing.
Described multi-frame accumulation module includes：Input in each frame time is added on frame in correspondence position, after M frame times, M frame accumulated values are inputted.
When using multi-frame accumulation module：Described frame boundary detector includes：Frame boundary detector will be completed in whole module initialization, LS code matched filters, and LA matchings and related Peak detector have initialized completions, into steady-working state M frames after start-up operation；Wherein：Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Amplitude maxima for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel；
Mobile station detects the corresponding outputs of wealthy value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise it is assumed that not detecting any synchronizing channel；The content of multi-frame accumulation device is set to 0, detected again after M frame times；Whole frame boundary detector will work untill detecting synchronizing channel always.Energy maximum value position is just blunt to can be obtained by frame boundaries position according to frame structure after treatment.
The beneficial effects of the present invention are a kind of initial frame boundary detection method and device based on LAS- cdma systems are provided, which raises the performance of initial frame boundary detection.
Illustrate the subframe structure figure that Fig. 1 is descending synchronous signal channel；
W
Fig. 2 is the structure chart of frame boundary detector；
Fig. 3 is the structure chart of LS code matched filters；
Fig. 4 is the schematic diagram of LA matching modules；
Fig. 5 is the structure chart of related Peak detector；
Fig. 6 is the frame boundary detector structure chart using multi-frame accumulation；
Fig. 7 is the structure chart of multi-frame accumulation device；
Fig. 8 is the structure chart of the frame boundary detector using multi-frame accumulation.
Embodiment
Invention provides a kind of initial frame boundary detection method and device based on LAS- cdma systems, and by simulating, verifying the present invention feasibility, provide reference for synchronous realize of TD- LAS systems.
In the quasi- commercial systems of TD-LAS, the structure of descending synchronous signal channel is as shown in Figure 1；The down-going synchronous physical channel of all cells uses identical LS spreading codes（Referring to table 1), different modulation symbol code characters come distinguishing cell.Sub-frame of downlink synchronization has 8 time slots; each slot length is with reference to table 2; one length of each slot transmission is the down-going synchronous pulse of 72 chips; the S codes of C codes and 24 chips comprising 24 chips; centre retains the protection band of 24 chips, and down-going synchronous pulse starts transmission in the starting of each time slot.LS codes for descending synchronous signal channel are complex codes, and corresponding spread spectrum conciliates overclass and is similar to QPSK, as shown in table 4.8 time slots of sub-frame of downlink synchronization can transmit 8 modulation symbols, the mutually orthogonal code sequence of 8 bipolaritys can be obtained altogether, such as every a line or each row of 8 8Walsh matrixes, these yard of sequence is called LA polarity sequences in the quasi- commercial systems of TD- LAS（Referring to table 3).8 orthogonal LA polarity sequences can support the networking of 8 cell/sections；Support bigger networking scale, it may be considered that and the method such as CP continuous pilot cell identification of other cell identifications is combined, and different cell/section clusters can also be made to use different LA protection intervals in addition, expands D- SYNPCH signal collection.
The spreading code of the descending synchronous signal channel of table 1.（LS codes）（j = V^T )
Index (i) LA polarity
0 + + + - - + - -
1+one+++one ---
2 ― ― + - + + + -
The LA polar codes of 3++--+one+- table 4. descending synchronous signal channel
The structure of initial frame boundary detection module is as shown in Fig. 2.The baseband digital signal speed of input is 4fc.The baseband signal of input carries out LS matched filterings first, and modulus square is divided into two-way.LA matchings are carried out all the way, realize that the energy of 8 LS symbols merges.Another road feeding correlation Peak detector, detects and whether there is possible down-going synchronous physical channel in the time delay.Related Peak detector exports the relevant peaks detected value exported under 3 road signals, respectively different thresholdings.If being output as 1, down-going synchronous physical channel is there may be in the time delay；G is output as, then descending synchronization physical channels are not present in the time delay.The delay of Postponement module is 49Tc in Fig. 2, and effect is to make the additional processing delay of two paths of signals equal.LA matching modules are exported and are multiplied respectively with 3 road signals of related Peak detector output, frame boundary detection module is sent into, initial frame boundary output is obtained.
The additional delay used in device calculation process is not considered in all delays in arthmetic statement.
Below, will be to LS matched filters, LA matching modules, related Peak detector, frame boundaries inspection ' survey device and be described respectively.
LS matched filters：
Definition "
If LS code waveforms are(t) = cRe (t) + jclm (t) , 0≤t≤ 72TC
The impulse Response Function of LS matched filters is：
Ht) = hRe (t) + jhlm (t) =
cRe (Γ - t) - jclm (T - 1) , 0≤t≤72Tc' T=72T is taken hereC。
Corresponding to input signal (ί) = sRe(t) + jsIm{t)
Output signal is 5 t)/7 (t)
= [sRe (t) + jslm (t)] ® [hKe (t) + jhlm (t)]
= ¾e() (0 one (0 hIm (t) + j[sRe (t) ® hlm (t) + slm (t) ® hRe (t)]
The structure of LS matched filters is as shown in Figure 3.
To plural β+jb, α+
a2 +b2
LA matching modules：
LA matching modules are the delay lines that a segment length is the common 811Tc of down-going synchronous physical channel length, and realize that the energy of LS symbols merges using 8 adders.Its structure chart is as shown in Figure 4：
Correlation detector：
The effect of related Peak detector is to detect to whether there is down-going synchronous physical channel in each time delay, and its structure is as shown in Figure 5.The related each module of Peak detector is described as follows：
The length for changing averaging module A is 24 chips, and Postponement module A delays are 24 chips；Threshold module A function is as follows：If the input that self-dalay modules A is come, which is more than K1, is multiplied by the input come from change averaging module A, 0 is exported, otherwise exports in the input that self-dalay modules A is come, algorithm and takes Kl=2;
Postponement module Β delay is 25 chips, and change averaging module Β length is 49 chips；Threshold module Β function is as follows：It is multiplied by if self-dalay module Β input is more than Κ 2 from the input for changing averaging module Β, exports 1, otherwise export and Κ 2=8 is taken in 0, algorithm;
Here the structure of LA matching modules and Fig. 3's is identical；
If being more than 6 from the input of LA matching modules, wealthy value module C1 is output as 1, and otherwise pavilion value module C1 is output as 0;If the input of LA matching modules is more than 5, threshold module C2 is output as 1, and otherwise threshold module C2 is output as 0;If being more than 4 from the input of LA matching modules, threshold module C3 is output as 1, and otherwise threshold module C3 is output as 0.
Frame boundary detector
Frame boundary detector will be completed in whole module initialization, LS matched filters, and LA matchings and related Peak detector have worked start-up operation after 72+811++ 25Tc+49Tc=957Tc.
The effect of frame boundary detector is：Sequence detection all time phases in a frame time, therefrom select possible frame boundaries.The signal exported from LS matched filters is multiplied with different relevant peaks Threshold detection output after the merging of LA symbol energies, as a result sends into frame boundary detector.As prior module, frame boundary detector is operated in 4 speed.Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Energy maximum value for corresponding to output all the way is 0, then it is assumed that be not detected by the way at this
Any synchronizing channel, otherwise it is assumed that there is synchronizing channel.The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of wealthy value C3 are detected, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries.Otherwise it is assumed that not detecting any synchronizing channel.
Whole frame boundary detection module will work untill detecting synchronizing channel always.
I/O and parameter：
Input signal：The output of baseband filter, signal rate
Output signal：Frame boundary detection Success Flag：（lbi t )
Frame boundaries position： ( 0, 30720*4 ) ( 17bi ts )
Parameter configuration：In relevant peaks detection module
K1 = 2;
2 = 8;
Detection：
If more preferable frame boundary detection performance can be obtained using the cumulative of many frame times in frame boundary detection.Structure using the frame boundary detector of multi-frame accumulation is as shown in Figure 6：
The effect of multi-frame accumulation device is to be added the input in each frame time on frame in correspondence position, after M frame times, inputs M frame accumulated values.Its structure is as shown in Figure 7：
Structure using the frame boundary detector of multi-frame accumulation is as shown in Figure 8：
Other corresponding changes of related Peak detector are：
If being more than Thres-Cl from the LA inputs matched, threshold value C1 is output as 1, and otherwise threshold value C1 is output as 0;If LA matching input be more than Thres-C2, ' then threshold value C2 be output as 1, otherwise threshold value C2 is output as 0;If the input of Self Matching is more than Thres-C3, threshold value C3 is output as 1, and otherwise threshold value C3 is output as 0.Here Thres-Cl>Thres— C2>Thres— C3.
The change of frame boundary detector is：
Frame boundary detector will be completed in whole module initialization, LS matched filters, LA matchings and phase
Peak detector is closed to have worked：
Started working after 72+811++ 25Tc+49Tc+M*30720Tc=957Tc+M*30720Tc.The effect of frame boundary detector is：Sequence detection all time phases in a frame time, therefrom select possible frame boundaries.The signal exported from LS matched filters is surveyed output after the merging of LA symbol energies, with different relevant peaks thresholding Gao and is multiplied, and as a result sends into frame boundary detector.As prior module, frame boundary detector is operated in 4fc speed.Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Amplitude maxima for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel.Mobile station detects the corresponding outputs of wealthy value C1 first, if detecting synchronizing channel, and Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position+25*4 is exported for frame boundaries.Otherwise it is assumed that not detecting any synchronizing channel.The content of multi-frame accumulation device is set to 0, detected again after the M*30720Tc times.
Whole frame boundary detection module will work untill detecting synchronizing channel always.
Parameter configuration：Add up many frame number M: 3
In relevant peaks detection module
K1 = 2;
2 = 8;
Threshold value C1=12;
Threshold value-C2=14;
Threshold value-C3=18;
The beneficial effects of the present invention are a kind of initial frame boundary detection method and device based on LAS-CDMA systems are provided, which raises the performance of initial frame boundary detection.
Above embodiment is to illustrate the invention and not to limit the present invention.
Claims (18)
- Claims1. a kind of initial frame boundary detection method based on the beautiful A systems of LAS- C, it is characterised in that comprise the following steps：Baseband signal to input carries out LS matched filterings, modulus square, is then divided into two paths of signals；Signal all the way in the two paths of signals is postponed, LA is matched, realize that the energy of LS symbols merges；Another road signal in the two paths of signals is subjected to related blob detection, detects and whether there is possible down-going synchronous physical channel in the time delay；Output signal after related blob detection；The signal multiplication exported after the signal and related blob detection that are exported after LA is matched, and the signal after multiplication is subjected to frame boundary detection, obtain initial frame boundary output.2. according to the method described in claim 1, it is characterised in that output signal refers to after described related blob detection：The relevant peaks detected value exported after related blob detection under outputting multiplex signals or signal all the way, respectively different thresholdings；Wherein：In relevant peaks monitor outputting multiplex signals, the signal exported after LA is matched is multiplied respectively with the multiple signals exported after related blob detection, and the signal after multiplication is carried out into frame boundary detection, obtains initial frame boundary output；When relevant peaks monitor only exports signal all the way, signal and this signal multiplication, and the signal after multiplication is subjected to frame boundary detection all the way that LA is exported after matching only are needed, initial frame boundary output is obtained.3. according to the method described in claim 1, it is characterised in that the baseband signal to input carries out LS matched filterings, modulus square and comprised the following steps：If LS codes waveform is c (t)=cRe (t) + jclm (t) , 0 < t < 72TC；The impulse Response Function of LS code matched filterings is：t)= cRe (Γ - t) - jclm (T - 1) , 0≤t≤12Tc, T=12T is taken hereC； Corresponding to input signal^^+^^), output signal is：
= [¾e (0 + 1ιη (t)] ® [/¾e (t) + jhlm (t)]= ¾e(t)®¾e(t)-¾l(t)®/2Im(t) + ; e(t)®/2lm(t) + 5lm(t)®/iRe(t)];To plural a+jb, a+jbf=a2 + &2。4. according to the method described in claim 1, it is characterised in that described LA matchings refer to：LA matching units are that a segment length is down-going synchronous physical channel long delay line, and realize that the energy of LS symbols merges using adder.5. according to the method described in claim 1, it is characterised in that described related blob detection refers to：Delay disposal, moving average processing, threshold process and LA matching treatments are carried out to the signal from LS code matched filters, detection output is obtained.6. according to the method described in claim 1, it is characterised in that described frame boundary detection refers to：Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Energy maximum value for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel.7. method according to claim 6, it is characterised in that described frame boundary detection also includes：Frame boundary detector will be initialized in whole unit and completed, LS code matched filters, and LA matchings and related Peak detector initialize completion, into steady-working state after start-up operation；The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Energy maximum value position can be obtained by frame boundaries after being handled according to frame format；Frame boundary detector will be detected until noisy value Cn, otherwise it is assumed that not detecting any synchronizing channel successively（Cn>C3>C2〉Cl );Whole frame boundary detector will work until detecting synchronizing channel always Untill.8. according to the method described in claim 1, it is characterised in that further comprising the steps of：Signal all the way in the two paths of signals is postponed, LA matching treatments, then carry out multi-frame accumulation processing.9. method according to claim 7, it is characterised in that described multi-frame accumulation refers to：Input in each frame time is added on frame in correspondence position, the end value after M frames add up after M frame times, is being inputted.10. the method according to claim 9, it is characterised in that when using multi-frame accumulation：Described frame boundary detection includes：Frame boundary detector will be completed in whole module initialization, LS code matched filters, and LA matchings and related Peak detector have initialized completions, into steady-working state M frames after start-up operation；Wherein：Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Amplitude maxima for corresponding to output all the way is 0, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel；The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Frame boundary detector will be detected until wealthy value Cn successively, otherwise it is assumed that not detecting any synchronizing channel；Energy maximum value position according to can be obtained by frame boundaries position after treatment；Whole frame boundary detector will work untill detecting synchronizing channel always.11. a kind of initial frame boundary detection means based on LAS- CDMA systems, including：LS matched filters, modulus squaring module, Postponement module, LA matching modules, related Peak detector, frame boundary detector；The baseband signal of input carries out LS matched filterings first, and modulus square is divided into two-way；LA matchings are carried out all the way；Another road feeding correlation Peak detector, is detected in the time delay with the presence or absence of possible Down-going synchronous physical channel；The relevant peaks detected value exported under related Peak detector outputting multiplex signals, respectively different thresholdings；If being output as 1, down-going synchronous physical channel is there may be in the time delay；0 is output as, then descending synchronization physical channels are not present in the time delay；The delay of Postponement module makes the additional processing delay of two paths of signals equal；The signal multiplication exported after output signal after related blob detection, the signal exported after LA is matched and related blob detection, and the signal after multiplication is subjected to frame boundary detection, obtain initial frame boundary output.12. device according to claim 11, it is characterised in that the input signal of described LS matched filters is：Baseband digital signal；If definition=^;If LS code waveforms are (t) = cRe (t) + jclm (t) , 0<t< 71TC；The impulse Response Function of LS matched filters is：hit) = (0 + jhIm (t) == cRe (T-t)- jclm (T - 1) , 0<t≤72 c, T=72T is taken hereC;
Corresponding to input signal (t)=(t)+Im(t), output signal is：s( ® (= ¾e(t)®/¾e(t)-5lm(t)®/iIm(t) + 7 e(t)®AIm( + ¾( ® ( ];To plural a+jb, a+jb2 = β2 +b2。13. device according to claim 11, it is characterised in that described LA matching modules include：Adder；LA matching units are that a segment length is the delay line of down-going synchronous physical channel length, and adder can be used to realize that the energy of LS symbols merges.14. device according to claim 11, it is characterised in that described related Peak detector includes：Moving average modules A;Postponement module A; Explain value modules A:Its function is：If the input that self-dalay modules A is come, which is more than K1, is multiplied by the input come from change averaging module A, 0 is exported, the input that self-dalay modules A is come otherwise is exported；Postponement module B;Moving average module B;Explain value module B:Its function is：It is multiplied by if self-dalay module B input is more than K2 from the input for changing averaging module B, exports 1, otherwise export 0;If being more than Thl from the input of LA matching modules, threshold module C1 is output as 1, and otherwise threshold module C1 is output as 0;If the input of LA matching modules is more than Th2, threshold module C2 is output as 1, and otherwise wealthy value module C2 is output as 0;If being more than Th3 from the input of LA matching modules, wealthy value module C3 is output as 1, and otherwise threshold module C3 is output as 0;If being more than Thn from the input of LA matching modules, wealthy value module Cii is output as 1, and otherwise threshold module C 3 is output as 0;Thl ＞ Th2 ＞ Th3 herein> ...>Thn.15. device according to claim 11, it is characterised in that described frame boundary detector includes：Frame boundary detector will be initialized in whole unit and completed, LS code matched filters, and LA is matched to start working with after related Peak detector steady operation；Wherein：Mobile station detects the corresponding outputs of wealthy value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Frame boundary detector will be detected until threshold value Cn successively, otherwise it is assumed that not detecting any synchronizing channel；Energy maximum value position according to can be obtained by frame boundaries position after treatment；Whole frame boundary detector will work untill detecting synchronizing channel always.16. device according to claim 11, wherein also including：Multi-frame accumulation module；Signal all the way in the two paths of signals is postponed, LA matching treatments, then carry out multi-frame accumulation processing.17. device according to claim 16, it is characterised in that described multi-frame accumulation module bag Include：Input in each frame time is added on frame in correspondence position, after M frame times, M frame accumulated result values are inputted.18. device according to claim 16, it is characterised in that described multi-frame accumulation module also includes：When using multi-frame accumulation module when, described frame boundary detector will be completed in whole module initialization, LS code matched filters, LA matching and correlation Peak detector has initialized completion, into steady-working state M frames after start-up operation；Wherein：Frame boundary detector detects the every signal all the way reached in a frame time, and write down the Energy maximum value and maximum value position of every signal all the way, if after a frame time, certain Amplitude maxima for corresponding to output all the way is Q, then think to be not detected by any synchronizing channel on the way at this, otherwise it is assumed that there is synchronizing channel；The corresponding outputs of mobile station detection threshold value C1 first, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C2, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise the corresponding outputs of detection threshold value C3, if detecting synchronizing channel, Energy maximum value position is exported；Otherwise it is assumed that not detecting any synchronizing channel；The content of multi-frame accumulation device is set to 0, detected again after M frame times；Whole frame boundary detector will work untill detecting synchronizing channel always；Energy maximum value position ^^ can be obtained by frame boundaries position according to frame structure after treatment；Whole frame boundary detector will work untill detecting synchronizing channel always.
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| PCT/CN2003/000060 WO2004066531A1 (en) | 2003-01-23 | 2003-01-23 | A method and apparatus for detecting original frame boundary based on a las-cdma system |
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| CN102263609A (en) * | 2010-05-31 | 2011-11-30 | 国际商业机器公司 | Frame boundary detection method, equipment thereof, decoding method and system thereof |
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| CN100407699C (en) * | 2005-04-01 | 2008-07-30 | 华为技术有限公司 | Signal disconnection and combination method and apparatus |
| CN107276945B (en) * | 2016-04-08 | 2019-12-10 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107276708B (en) * | 2016-04-08 | 2020-01-07 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107277913B (en) * | 2016-04-08 | 2019-12-10 | 深圳光启合众科技有限公司 | timing synchronization method, device and system |
| CN107276953B (en) * | 2016-04-08 | 2020-01-07 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107276943B (en) * | 2016-04-08 | 2020-01-07 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107302411B (en) * | 2016-04-08 | 2019-11-08 | 深圳光启合众科技有限公司 | Time synchronization method, device and system |
| CN107276740B (en) * | 2016-04-08 | 2020-01-07 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107276944B (en) * | 2016-04-08 | 2020-01-03 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
| CN107276940B (en) * | 2016-04-08 | 2019-12-06 | 深圳光启合众科技有限公司 | Timing synchronization method, device and system |
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| US6597922B1 (en) * | 1999-05-14 | 2003-07-22 | Qualcomm Incorporated | Method and apparatus for efficient candidate frequency search while initiating a handoff in a code division multiple access communication system |
| CN1133351C (en) * | 1999-11-12 | 2003-12-31 | 深圳市中兴通讯股份有限公司 | Time slot synchronizer in regional search for WCDMA system |
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| CN102263609A (en) * | 2010-05-31 | 2011-11-30 | 国际商业机器公司 | Frame boundary detection method, equipment thereof, decoding method and system thereof |
| CN102263609B (en) * | 2010-05-31 | 2014-03-05 | 国际商业机器公司 | Frame boundary detection method, equipment thereof, decoding method and system thereof |
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