CN104243368A - Time slot structure phase calibration method and device based on TD-SCDMA system - Google Patents
Time slot structure phase calibration method and device based on TD-SCDMA system Download PDFInfo
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Abstract
The embodiment of the invention discloses a time slot structure phase calibration method and device based on a TD-SCDMA system. The method includes the steps of conducting correlation operation on a burst middle code sequence of the time slot of a received symbol and a local reference signal, calculating the first phase offset according to the result of the correlation operation, conducting phase compensation on the received symbol through the first phase offset, conducting hard decision and demodulation on the received symbol where phase compensation is conducted, conducting remodulation on data obtained through demodulation, conducting correlation operation on the modulated symbol sequence and the sequence of the received symbol, calculating the second phase offset according to the result of the correlation calculation, and conducting phase compensation on the received symbol through the second phase offset. By means of the time slot structure phase calibration method and device, the TD-SCDMA can normally work under the large frequency offset environment.
Description
Technical field
The application relates to communication technical field, particularly a kind of based on the structure of time slot phase alignment of TD-SCDMA system and the device of correspondence thereof.
Background technology
TD-SCDMA (Time Division-Synchronous Code Division Multiple Access, TD SDMA) system is one of three 3G standards of ITU approval, for the 3G standard (CDMA2000 and WCDMA) main relative to two other, start late.But, TD-SCDMA system in the availability of frequency spectrum, frequency flexibility, to business support, there is the many-sides such as diversity and have unique advantage.The advantage of TD-SCDMA system originates from its special frame structure and time slot burst structure.
See Fig. 1 (a) ~ (b), wherein: Fig. 1 (a) shows the frame structure of TD-SCDMA system physical channel, Fig. 1 (b) shows the burst structure of TD-SCDMA system physical channel business time-slot.As seen from the figure; every frame frame length of TD-SCDMA is 10ms, and every frame is divided into the subframe of 2 5ms, and each subframe is further divided into the main time slot and 3 special time slot (DwPTS: downward guide that 7 durations are 675 μ s; GP: protection period, UpPTS: up guiding).Time slot content is the burst of corresponding length, and each burst comprises two data symbol fields, the infix code (Midamble code) of 144chips length and 16chips protection period (GP).Although TD-SCDMA system have employed foregoing frame structure and time slot burst structure, but stir in terminal local frequency, under the situation such as terminal fast moving, handover, still larger phase deviation may be there is, if do not carry out phase alignment before receiver carries out demodulation, systematic function will be made to be affected.Prior art adopts data symbol to carry out phase alignment, namely utilize the data symbol at Midamble code two ends in time slot burst structure to carry out phase alignment, this calibrating mode will carry out hard decision to the data symbol received, and the effective maximum permission phase deviation of hard decision is π/4, otherwise, will make mistakes.
But, when considering that frequency deviation reaches 1500Hz, the midamble code length of each burst of TD-SCDMA is 144chip, the Doppler phase shift of midamble code is approximately π/4, the data symbol at next-door neighbour midamble code two ends is π/8 to the phase shift of midamble code center, and it is more serious more to depart from the phase shift of midamble code, if consider the impact that carrier frequency drift, noise, interference and switching bring again, the phase shift of the data symbol at midamble code two ends may more than π/4.As can be seen here, the method adopting data symbol to carry out phase alignment can not work under large frequency deviation.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the present application provides the device of phase alignment that a kind of time slot based on TD-SCDMA system happens suddenly and correspondence thereof, can carry out phase alignment to make TD-SCDMA system under large frequency deviation.
The phase alignment of the structure of time slot based on TD-SCDMA system that the embodiment of the present application provides comprises:
The midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Result according to related operation calculates first phase side-play amount;
First phase side-play amount is utilized to carry out phase compensation to receiving symbol;
Hard decision, demodulation are carried out to the receiving symbol after phase compensation;
Data after demodulation are modulated again;
Related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Result according to related operation calculates second phase side-play amount;
Second phase side-play amount is utilized to carry out phase compensation to receiving symbol.
Preferably, described local reference signal obtains in the following manner:
Midamble sequence according to the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol carries out channel estimating;
The midamble sequence convolution that the known time slot of the result of channel estimating and this locality happens suddenly is obtained local reference signal.
Further preferably, after carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol, signal strength signal intensity on the result retention time position of channel estimating is greater than to the tap response of the signal of preset value, signal strength signal intensity is less than the tap response zero setting of the signal of preset value to realize noise reduction, describedly the midamble sequence convolution that the known time slot of the result of channel estimating and this locality happens suddenly is obtained the midamble sequence convolution that local reference signal is specially the known time slot of the channel estimation results after noise reduction process and this locality happens suddenly and obtain local reference signal.
The embodiment of the present application additionally provides a kind of phase alignment of the structure of time slot based on TD-SCDMA system.The method comprises:
The midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Result according to related operation calculates first phase side-play amount;
Judge whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then utilize first phase side-play amount to carry out phase compensation to receiving symbol, process ends; If not, then following steps are performed: hard decision, demodulation are carried out to receiving symbol; Data after demodulation are modulated again; Related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol; Result according to related operation calculates second phase side-play amount; Second phase side-play amount is utilized to carry out phase compensation to receiving symbol.
Preferably, the Doppler shift higher limit that described pre-determined threshold threshold value is calibrated according to the Doppler shift lower limit of first phase side-play amount or data segment, and/or link noise, and/or channel type is determined.
The embodiment of the present application additionally provides a kind of phase alignment device of the structure of time slot based on TD-SCDMA system.This device comprises: the first relevant arithmetic element, first phase offset computation unit, first phase compensating unit, hard decision and demodulating unit, modulating unit, the second relevant arithmetic element, second phase offset computation unit and second phase compensating unit, wherein:
Described first relevant arithmetic element, carries out related operation for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal;
Described first phase offset computation unit, calculates first phase side-play amount for the result according to related operation;
Described first phase compensating unit, carries out phase compensation for utilizing first phase side-play amount to receiving symbol;
Described hard decision and demodulating unit, for carrying out hard decision, demodulation to the receiving symbol after phase compensation;
Described modulating unit, for modulating the data after demodulation again;
Described second relevant arithmetic element, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Described second phase offset computation unit, calculates second phase side-play amount for the result according to related operation;
Described second phase compensating unit, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
Preferably, described device comprises reference signal acquiring unit, and this unit comprises channel estimating subelement and convolution algorithm subelement, wherein:
Described channel estimating subelement, for carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol;
Described convolution algorithm subelement, obtains local reference signal for the midamble sequence convolution happened suddenly by the known time slot of the result of channel estimating and this locality.
Further preferably, described reference signal acquiring unit also comprises noise reduction subelement, for after carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol, signal strength signal intensity on the result retention time position of channel estimating is greater than to the tap response of the signal of preset value, signal strength signal intensity is less than the tap response zero setting of the signal of preset value; Described convolution algorithm subelement obtains local reference signal specifically for the midamble sequence convolution happened suddenly by the known time slot of the channel estimation results after noise reduction process and this locality.
The embodiment of the present application additionally provides a kind of phase alignment device of the structure of time slot based on TD-SCDMA system.This device comprises: the first relevant arithmetic element, first phase offset computation unit, side-play amount judging unit, first phase compensating unit, hard decision and demodulating unit, modulating unit, the second relevant arithmetic element, second phase offset computation unit and second phase offset compensation unit, wherein:
Described first relevant arithmetic element, carries out related operation for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal;
Described first phase offset computation unit, calculates first phase side-play amount for the result according to related operation;
Described side-play amount judging unit, for judging whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then triggers first phase compensating unit and utilizes first phase side-play amount to carry out phase compensation to receiving symbol, process ends; If not, then hard decision and demodulating unit is triggered;
Described hard decision and demodulating unit, for carrying out hard decision, demodulation to receiving symbol;
Described modulating unit, for modulating the data after demodulation again;
Described second relevant arithmetic element, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Described second phase offset computation unit, calculates second phase side-play amount for the result according to related operation;
Described second phase compensating unit, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
The midamble sequence that the embodiment of the present application happens suddenly to the time slot of receiving symbol and local reference signal carry out related operation, first phase side-play amount is calculated according to correlation result, this side-play amount is utilized to compensate, hard decision, demodulation are carried out to the receiving symbol after phase compensation, then, data after demodulation are modulated again, related operation, calculating second phase side-play amount, and utilize second phase side-play amount to carry out phase compensation.Compared with prior art, the embodiment of the present application carries out twice phase compensation, first time phase compensation carries out preliminary phase compensation according to the intermediate code (midamble code) of TD-SCDMA structure of time slot, second time phase compensation carries out phase compensation again according to the data symbol of TD-SCDMA structure of time slot, by twice different phase compensation, the system based on TD-SCDMA structure of time slot normally can be worked under larger frequency deviation environment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present application or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, the accompanying drawing that the following describes is only some embodiments recorded in the application, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 (a) is TD-SCDMA system physical channel frame structure schematic diagram;
Fig. 1 (b) is TD-SCDMA system physical channel business time-slot burst structure schematic diagram;
Fig. 2 is the flow chart of one of the phase alignment embodiment based on TD-SCDMA system structure of time slot of the application;
Fig. 3 is that different calibrating mode is on one of the situation that affects emulation schematic diagram of BER;
Fig. 4 is the flow chart of the phase alignment embodiment two based on TD-SCDMA system structure of time slot of the application;
Fig. 5 is the affect situation emulation schematic diagram two of different calibrating mode on BER;
Fig. 6 is the structured flowchart of the phase alignment device embodiment based on TD-SCDMA system structure of time slot of the application.
Embodiment
Technical scheme in the application is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present application, technical scheme in the embodiment of the present application is clearly and completely described, obviously, described embodiment is only some embodiments of the present application, instead of whole embodiments.Based on the embodiment in the application, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all should belong to the scope of the application's protection.
See Fig. 2, the figure shows the flow process of the phase alignment embodiment (embodiment one) of the structure of time slot based on TD-SCDMA system of the application.This flow process comprises:
Step S201: the midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Suppose that intermediate code (midamble code) sequence that the time slot of receiving symbol happens suddenly is e
mid, local reference signal
then can carry out related operation according to the following equation:
Here local reference signal can be the general local signal preset at receiving terminal, also can be the local reference signal recovered on the time slot burst basis of receiving symbol.The channel that this process can be transmitted by receiving symbol carries out estimation and obtains.Suppose m
basicfor known midamble code sequence, channel estimating can be carried out according to the following equation:
Then by estimation channel and known midamble code sequence convolution are obtained local reference signal, that is:
In actual application, for avoiding noise on the impact recovering local reference signal, after carrying out channel estimating, usually also noise reduction process is carried out to estimation channel.Noise reduction process can take various ways, preferred to estimating that channel retains or zero-setting operation here, namely retains signal strength signal intensity on finite time position and is greater than the response of the tap of preset value, and by the response zero setting in all the other taps.After noise reduction process, aforesaid utilization estimate channel and midamble code sequence convolution obtain local reference signal be then specially utilizes the estimation channel after noise reduction is estimated and midamble code sequence convolution obtain local reference signal.
Step S202: the result according to related operation calculates first phase side-play amount;
Obtained the result of related operation by abovementioned steps after, this correlation can be utilized to carry out the estimation phase pushing figure of phase pushing figure, for distinguishing with follow-up phase pushing figure, referred to herein as first phase side-play amount.In actual application, the present embodiment is preferably carrying out carrying out chip combination operation in phase pushing figure estimation procedure, (part) can balance out the error that noise brings like this.Suppose correlated results merge after signal indication be d=(d
1, d
2..., d
l).
Get L=P/q, P is midamble code length, and q is the quantity (note: q can value be 1, at this moment in fact represents and does not carry out chip combination) of carrying out chip combination.Q chip is merged:
The then phase angle θ of amalgamation result
d=(θ
d, 1, θ
d, 2..., θ
d, L) be
Phase pushing figure is calculated by above formula:
Step S203: utilize first phase side-play amount to carry out phase compensation to receiving symbol;
After calculating phase pushing figure by abovementioned steps, this phase pushing figure can be utilized to carry out phase compensation to receiving symbol.Can entire compensation when carrying out phase compensation, each data symbol that also can first calculate in the time slot burst of TD-SCDMA needs the phase place cita ' compensated, and then carries out phase compensation one by one:
cita′＝Δθ·Q/q
Wherein: Q is data spreading factor.
Step S204: hard decision, demodulation are carried out to the receiving symbol after phase compensation;
Step S205: the data after demodulation are modulated again;
Step S206: related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Step S207: the result according to related operation calculates second phase side-play amount;
Step S208: utilize second phase side-play amount to carry out phase compensation to receiving symbol.
The midamble sequence that the present embodiment happens suddenly to the time slot of receiving symbol and local reference signal carry out related operation, first phase side-play amount is calculated according to correlation result, this side-play amount is utilized to compensate, hard decision, demodulation are carried out to the receiving symbol after phase compensation, then, data after demodulation are modulated again, related operation, calculating second phase side-play amount, and utilize second phase side-play amount to carry out phase compensation.Compared with prior art, the present embodiment carries out twice phase compensation, first time phase compensation carries out preliminary phase compensation according to the intermediate code (midamble code) of TD-SCDMA structure of time slot, second time phase compensation carries out phase compensation again according to the data symbol of TD-SCDMA structure of time slot, by twice different phase compensation, the system based on TD-SCDMA structure of time slot normally can be worked under larger frequency deviation environment.
In order to the technique effect of the present embodiment is described, the effect of applicant to different phase alignment modes has carried out analog simulation.See Fig. 3, the figure shows different calibrating mode affects situation to BER.Have employed three kinds of phase alignment modes: one is the Data symbol phase calibrating mode of prior art, as the curve with circle in figure in this figure; Two is the phase alignment modes only adopting the step S201 of the present embodiment ~ S203 step to carry out, as the curve with rectangle frame in figure; Three is the phase alignment modes adopting the entire protocol of the present embodiment to carry out, as the curve with diamond symbols in figure.Obviously can be found out by emulation, adopt the method for the present embodiment to carry out phase alignment and can reach reduction BER, improve entire system performance.
Although above-described embodiment can realize phase alignment, but, in actual application, consider the length relation (midamble code length is shorter than data segment, length) of the data segment at midamble code and its two ends in the time slot burst structure of TD-SCDMA, for the situation of the little frequency deviation region that step S204 ~ 208 in above-described embodiment can normally work, adopt the phase compensation of step S201 ~ S203 less better, based on this feature, a kind of operation of optimization adopts aforesaid different step as required.For this reason, present invention also provides a kind of embodiment (embodiment two) of phase alignment of structure of time slot of TD-SCDMA system.See Fig. 4, the figure shows the flow process of this embodiment.This flow process comprises:
Step S401: the midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Step S402: the result according to related operation calculates first phase side-play amount;
Step S403: judge whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then performs step S404: if not, then performs step S405:
Step S404: utilize first phase side-play amount to carry out phase compensation to receiving symbol, process ends;
Through aforementioned determining step, distinguish different flow process trends: when first phase side-play amount is greater than pre-determined threshold threshold values, illustrate that side-play amount is larger, system works is under larger frequency deviation environment, and in this case, how the speed of compensation becomes the main consideration point of compensation effect, therefore, take the phase compensation mode settled at one go, the mode of this compensation can improve compensation efficiency, namely terminates whole phase alignment flow process after this step executes; When first phase side-play amount is less than pre-determined threshold threshold value, but although illustrate by phase deviation phase pushing figure little, system works is under less frequency deviation environment, in this case how the precision compensated becomes the main consideration point of compensation effect, therefore, also need to adopt following step to compensate operation further.
Step S405: utilize first phase side-play amount to carry out phase compensation to receiving symbol;
It should be noted that, although step S405 is identical with step S404 here, but their trend is completely different, after step S404 executes, namely whole flow process terminates, also, namely when first phase side-play amount is greater than default pre-determined threshold threshold value, good compensation effect can be reached by means of only the compensation of first phase side-play amount, and without the need to more step.Meanwhile, this also utilizes the usually larger feature of first phase side-play amount.It should be noted that: in some cases not have step S405, namely when judging that first phase side-play amount is less than pre-determined threshold threshold value, directly can perform step S406, step S406 is directly " carrying out hard decision, demodulation to receiving symbol ".
Step S406: hard decision, demodulation are carried out to the receiving symbol after phase compensation;
Step S407: the data after demodulation are modulated again;
Step S408: related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Step S409: the result according to related operation calculates second phase side-play amount;
Step S410: utilize second phase side-play amount to carry out phase compensation to receiving symbol.
The present embodiment and the topmost difference of previous embodiment are to add determining step, result according to judging carries out different flow processs, this mode takes full advantage of two kinds of phase pushing figures to the respective contribution advantage on phase alignment, selectively used by determining step, thus enhance the flexibility of phase alignment, also improve the efficiency of compensation on the other hand.
Mention in the S403 of above-described embodiment (embodiment two) and need first phase side-play amount and pre-determined threshold threshold value to be compared, to take phase compensation measure selectively according to comparative result.How how the degree that the whole structure of the program can reach will be somewhat dependent upon this threshold value is arranged.Under normal circumstances, a good threshold value can be chosen by constantly experiment, emulation, the determination mode of three kinds of threshold values is provided here:
One is the initial value first setting a pre-determined threshold at random, then takes corresponding measure to improve the effect of phase alignment.Such as, if the threshold value of initial setting is excessive, incorporate into making the situation that the first phase side-play amount in above-described embodiment should be adopted to carry out phase alignment among the phase alignment mode adopting S406 ~ S410 step, at this moment according to the effect of phase alignment, predetermined threshold value can be turned down, on the contrary, if the threshold value of initial setting is too small, adopting first phase side-play amount to carry out among phase alignment mode by making to adopt the situation of the phase alignment of S406 ~ S410 step to incorporate into, at this moment according to the effect of phase alignment, predetermined threshold value can be heightened.Certainly, to heighten initial value according to phase alignment effect except the measure turned down except this, the adverse effect that can also adopt other measures that initial value design is brought is eliminated.Such as, when predetermined threshold value is higher, because the situation that first phase side-play amount should be adopted to carry out phase alignment could not adopt first phase side-play amount to calibrate, therefore, the S405 step of carrying out before carrying out S406 ~ S410 step as described in above-described embodiment can carry out preliminary phase alignment, and then adopt S406 ~ S410 step to carry out quadratic phase calibration; When predetermined threshold value is lower, S406 ~ S410 step could not be adopted to carry out phase alignment due to the phase alignment mode of S406 ~ S410 step should be adopted, therefore, can after utilizing first phase side-play amount to carry out preliminary phase alignment, adopt step S406 ~ S410 step to carry out quadratic phase calibration again, namely after the S404 step of above-described embodiment, increase step S406 ~ S410.
Two is according to first phase side-play amount in above-described embodiment and relevant parameters determination threshold value.In the aforementioned embodiment, mention the midamble sequence that can be happened suddenly by the time slot of receiving symbol and local reference signal to carry out related operation and obtain first phase side-play amount, owing to being utilize first phase side-play amount to carry out preliminary phase alignment after this step, preliminary phase alignment is " just calibrating ", " just should calibrate " and there is a lower limit, being less than this lower limit may cause the function of " just calibrating " not play preferably, namely make " just calibrating " function normally can not play corresponding first phase side-play amount is the lower limit (critical value) needing to find, this critical value is converted to Doppler shift lower limit, then, can according to this value determination threshold value.In actual applications, except consideration Doppler shift lower limit, also must consider some practical factor, such as link noise, channel type etc., because the noise in link or channel type will have an impact to the interdependent of data symbol, therefore, under normal circumstances, on the aforementioned threshold value basis determined, also should make suitable reduction according to the severe degree of noise, channel type.
Three is determine a suitable threshold value according in prior art to the statistics of data segment phase alignment mode or theory analysis data and relevant parameters.1500Hz is reached for frequency deviation, in this case, the midamble code length of each burst of TD-SCDMA is 144chip, the Doppler phase shift of midamble code is approximately π/4, the data symbol at next-door neighbour midamble code two ends is π/8 to the phase shift of midamble code center, adopt hard decision to require that the phase shift of symbol can not more than π/4 in theory, the Doppler frequency shift of link is no more than 740Hz, and namely Doppler frequency shift higher limit is 740Hz.Considering signal to noise ratio, after spread spectrum coefficient, employing midamble code carry out the relevant parameters such as midamble segments when frequency deviation is estimated and noise reduction process, this threshold value is about 417Hz.For ensureing that system can both steady operation in any case, the threshold value determined may be also low.Be such as 178Hz.See Fig. 5, the figure shows out of phase calibrating mode affects situation to BER.Have employed four kinds of phase alignment modes: one is the Data symbol phase calibrating mode of prior art, as the curve with circle in figure in this figure; Two is the phase alignment modes only adopting the step S401 of embodiment two ~ S403 step to carry out, as the curve with rectangle frame in figure; Three is phase alignment modes when adopting the threshold value of embodiment two to be 417Hz, as the curve with diamond symbols in figure; Four is phase alignment modes when adopting the threshold value of embodiment two to be 178Hz, as the curve with triangle in figure.As seen from the figure, adopting the phase alignment mode of the embodiment of the present application two greatly can reduce BER, BER can also be reduced to a greater degree when adopting suitable threshold value.
Foregoing describes the embodiment of the phase alignment of the structure of time slot based on TD-SCDMA system of the application in detail.Correspondingly, present invention also provides a kind of phase alignment device embodiment of the structure of time slot based on TD-SCDMA system.See Fig. 6, the figure shows the structure composition of this embodiment.This phase alignment device comprises: the first relevant arithmetic element 601, first phase offset computation unit 602, first phase compensating unit 603, hard decision and demodulating unit 604, the relevant arithmetic element 606 of modulating unit 605, second, second phase offset computation unit 607 and second phase compensating unit 608, wherein:
First relevant arithmetic element 601, carries out related operation for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal;
First phase offset computation unit 602, calculates first phase side-play amount for the result according to related operation;
First phase compensating unit 603, carries out phase compensation for utilizing first phase side-play amount to receiving symbol;
Hard decision and demodulating unit 604, for carrying out hard decision, demodulation to the receiving symbol after phase compensation;
Modulating unit 605, for modulating the data after demodulation again;
Second relevant arithmetic element 606, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Second phase offset computation unit 607, calculates second phase side-play amount for the result according to related operation;
Second phase compensating unit 608, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
The course of work of above-mentioned phase alignment device is: the midamble sequence that the first relevant arithmetic element 601 first happens suddenly to the time slot of receiving symbol and local reference signal carry out related operation, first phase side-play amount is calculated according to the result of related operation again by first phase offset computation unit 602, then first phase compensating unit 603 utilizes first phase side-play amount to carry out phase compensation to receiving symbol, receiving symbol after hard decision and demodulating unit 604 pairs of phase compensations carries out hard decision, demodulation, then, data after demodulation are modulated by modulating unit 605 again, the sequence of the second relevant arithmetic element 606 to the symbol sebolic addressing after modulation and receiving symbol carries out related operation, second phase side-play amount is calculated according to the result of related operation again by second phase offset computation unit 607, second phase compensating unit 608 utilizes second phase side-play amount to carry out phase compensation to receiving symbol.
The midamble sequence that this device embodiment happens suddenly to the time slot of receiving symbol and local reference signal carry out related operation, first phase side-play amount is calculated according to correlation result, this side-play amount is utilized to compensate, hard decision, demodulation are carried out to the receiving symbol after phase compensation, then, data after demodulation are modulated again, related operation, calculating second phase side-play amount, and utilize second phase side-play amount to carry out phase compensation.Compared with prior art, this device embodiment carries out twice phase compensation, first time phase compensation carries out preliminary phase compensation according to the intermediate code (midamble code) of TD-SCDMA structure of time slot, second time phase compensation carries out phase compensation again according to the data symbol of TD-SCDMA structure of time slot, by twice different phase compensation, the system based on TD-SCDMA structure of time slot normally can be worked under larger frequency deviation environment.
Said apparatus embodiment can comprise reference signal acquiring unit 609, for obtaining reference signal.Different according to the mode obtaining reference signal, the structure of reference signal acquiring unit is also different.Such as, a kind of reference signal acquiring unit 609 can comprise: channel estimating subelement 6091 and convolution algorithm subelement 6092, wherein: channel estimating subelement 6091, for carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol; Convolution algorithm subelement 6092, obtains local reference signal for the midamble sequence convolution happened suddenly by the known time slot of the result of channel estimating and this locality.Noise reduction subelement 6093 can also be comprised in above-mentioned reference signal acquiring unit, for after carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol, signal strength signal intensity on the result retention time position of channel estimating is greater than to the tap response of the signal of preset value, signal strength signal intensity is less than the tap response zero setting of the signal of preset value; Described convolution algorithm subelement obtains local reference signal specifically for the midamble sequence convolution happened suddenly by the known time slot of the channel estimation results after noise reduction process and this locality.
The application, except providing said apparatus embodiment, additionally provides the another kind of phase alignment device embodiment based on the structure of time slot of TD-SCDMA system.This embodiment comprises: the first relevant arithmetic element, first phase offset computation unit, side-play amount judging unit, first phase compensating unit, hard decision and demodulating unit, modulating unit, the second relevant arithmetic element, second phase offset computation unit and second phase offset compensation unit, wherein: the described first relevant arithmetic element, related operation is carried out for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal; Described first phase offset computation unit, calculates first phase side-play amount for the result according to related operation; Described side-play amount judging unit, for judging whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then triggers first phase compensating unit and utilizes first phase side-play amount to carry out phase compensation to receiving symbol, process ends; If not, then hard decision and demodulating unit is triggered; Described hard decision and demodulating unit, for carrying out hard decision, demodulation to the receiving symbol after phase compensation; Described modulating unit, for modulating the data after demodulation again; Described second relevant arithmetic element, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol; Described second phase offset computation unit, calculates second phase side-play amount for the result according to related operation; Described second phase compensating unit, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
It should be noted that: easy in order to what describe, the difference that what above-described embodiment of this specification and the various distortion implementations of embodiment stressed is all with other embodiments or mode of texturing, between each situation identical similar part mutually see.Especially, for several improved procedures of device embodiment, because it is substantially similar to embodiment of the method, so describe fairly simple, relevant part illustrates see the part of embodiment of the method.Each unit of device embodiment described above or can may not be and physically separates, and both can be positioned at a place, or under also can being distributed to multiple network environment.In actual application, some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme, and those of ordinary skill in the art, when not paying creative work, are namely appreciated that and implement.
The above is only the embodiment of the application; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the application's principle; can also make some improvements and modifications, these improvements and modifications also should be considered as the protection range of the application.
Claims (10)
1. based on a phase alignment for the structure of time slot of TD-SCDMA system, it is characterized in that, the method comprises:
The midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Result according to related operation calculates first phase side-play amount;
First phase side-play amount is utilized to carry out phase compensation to receiving symbol;
Hard decision, demodulation are carried out to the receiving symbol after phase compensation;
Data after demodulation are modulated again;
Related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Result according to related operation calculates second phase side-play amount;
Second phase side-play amount is utilized to carry out phase compensation to receiving symbol.
2. method according to claim 1, is characterized in that, described local reference signal obtains in the following manner:
Midamble sequence according to the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol carries out channel estimating;
The midamble sequence convolution that the known time slot of the result of channel estimating and this locality happens suddenly is obtained local reference signal.
3. method according to claim 2, it is characterized in that, after carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol, the result stick signal intensity of channel estimating is greater than to the tap response of the signal of preset value, signal strength signal intensity is less than the tap response zero setting of the signal of preset value to realize noise reduction, describedly the midamble sequence convolution that the known time slot of the result of channel estimating and this locality happens suddenly is obtained the midamble sequence convolution that local reference signal is specially the known time slot of the channel estimation results after noise reduction process and this locality happens suddenly and obtain local reference signal.
4. based on a phase alignment for the structure of time slot of TD-SCDMA system, it is characterized in that, the method comprises:
The midamble sequence happen suddenly to the time slot of receiving symbol and local reference signal carry out related operation;
Result according to related operation calculates first phase side-play amount;
Judge whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then utilize first phase side-play amount to carry out phase compensation to receiving symbol, process ends; If not, then following steps are performed: hard decision, demodulation are carried out to receiving symbol; Data after demodulation are modulated again; Related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol; Result according to related operation calculates second phase side-play amount; Second phase side-play amount is utilized to carry out phase compensation to receiving symbol.
5. method according to claim 4, is characterized in that, after utilizing first phase side-play amount to carry out phase compensation to receiving symbol, performs following steps: carry out hard decision, demodulation to the receiving symbol after phase compensation; Data after demodulation are modulated again; Related operation is carried out to the sequence of the symbol sebolic addressing after modulation and receiving symbol; Result according to related operation calculates second phase side-play amount; Second phase side-play amount is utilized to carry out phase compensation to receiving symbol, process ends.
6. method according to claim 5, is characterized in that, the Doppler shift higher limit that described pre-determined threshold threshold value is calibrated according to the Doppler shift lower limit of first phase side-play amount or data segment, and/or link noise, and/or channel type is determined.
7. the phase alignment device based on the structure of time slot of TD-SCDMA system, it is characterized in that, this device comprises: the first relevant arithmetic element, first phase offset computation unit, first phase compensating unit, hard decision and demodulating unit, modulating unit, the second relevant arithmetic element, second phase offset computation unit and second phase compensating unit, wherein:
Described first relevant arithmetic element, carries out related operation for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal;
Described first phase offset computation unit, calculates first phase side-play amount for the result according to related operation;
Described first phase compensating unit, carries out phase compensation for utilizing first phase side-play amount to receiving symbol;
Described hard decision and demodulating unit, for carrying out hard decision, demodulation to the receiving symbol after phase compensation;
Described modulating unit, for modulating the data after demodulation again;
Described second relevant arithmetic element, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Described second phase offset computation unit, calculates second phase side-play amount for the result according to related operation;
Described second phase compensating unit, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
8. device according to claim 7, is characterized in that, described device comprises reference signal acquiring unit, and this unit comprises channel estimating subelement and convolution algorithm subelement, wherein:
Described channel estimating subelement, for carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol;
Described convolution algorithm subelement, obtains local reference signal for the midamble sequence convolution happened suddenly by the known time slot of the result of channel estimating and this locality.
9. device according to claim 8, it is characterized in that, described reference signal acquiring unit also comprises noise reduction subelement, for after carrying out channel estimating according to the midamble sequence of the midamble sequence of the known time slot burst in this locality and the time slot burst of receiving symbol, the result stick signal intensity of channel estimating is greater than to the tap response of the signal of preset value, signal strength signal intensity is less than the tap response zero setting of the signal of preset value; Described convolution algorithm subelement obtains local reference signal specifically for the midamble sequence convolution happened suddenly by the known time slot of the channel estimation results after noise reduction process and this locality.
10. the phase alignment device based on the structure of time slot of TD-SCDMA system, it is characterized in that, described device comprises: the first relevant arithmetic element, first phase offset computation unit, side-play amount judging unit, first phase compensating unit, hard decision and demodulating unit, modulating unit, the second relevant arithmetic element, second phase offset computation unit and second phase offset compensation unit, wherein:
Described first relevant arithmetic element, carries out related operation for the midamble sequence that happens suddenly to the time slot of receiving symbol and local reference signal;
Described first phase offset computation unit, calculates first phase side-play amount for the result according to related operation;
Described side-play amount judging unit, for judging whether described first phase side-play amount is greater than pre-determined threshold threshold value, if so, then triggers first phase compensating unit and utilizes first phase side-play amount to carry out phase compensation to receiving symbol, process ends; If not, then hard decision and demodulating unit is triggered;
Described hard decision and demodulating unit, for carrying out hard decision, demodulation to receiving symbol;
Described modulating unit, for modulating the data after demodulation again;
Described second relevant arithmetic element, for carrying out related operation to the sequence of the symbol sebolic addressing after modulation and receiving symbol;
Described second phase offset computation unit, calculates second phase side-play amount for the result according to related operation;
Described second phase compensating unit, carries out phase compensation for utilizing second phase side-play amount to receiving symbol.
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