CN101814931B - Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system - Google Patents

Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system Download PDF

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CN101814931B
CN101814931B CN200910006579.1A CN200910006579A CN101814931B CN 101814931 B CN101814931 B CN 101814931B CN 200910006579 A CN200910006579 A CN 200910006579A CN 101814931 B CN101814931 B CN 101814931B
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time slot
mobile terminal
doppler frequency
current time
time slots
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CN200910006579.1A
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CN101814931A (en
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朱昀
王曼
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中兴通讯股份有限公司
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69Spread spectrum techniques
    • H04B1/707Spread spectrum techniques using direct sequence modulation
    • H04B1/7073Synchronisation aspects
    • H04B1/7087Carrier synchronisation aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0014Carrier regulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/0014Carrier regulation
    • H04L2027/0044Control loops for carrier regulation
    • H04L2027/0063Elements of loops
    • H04L2027/0067Phase error detectors

Abstract

The invention relates to a Doppler frequency shift estimation and compensation method in a TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system. The method comprises the following step of: after a mobile terminal receives a time slot containing the data of the mobile terminal, obtaining a Doppler frequency offset value of a receiving signal of the current time slot through comparing the phase differences of channel estimation sequences of the current time slot and a comparison time slot. The compensation method of the Doppler frequency shift in the TD-SCDMA system comprises the following steps of: after the mobile terminal receives the time slot containing the data of the mobile terminal, obtaining the Doppler frequency offset value of the receiving signal of the current time slot through comparing the phase differences of the channel estimation sequences of the current time slot and the comparison time slot; and correcting the receiving signal in joint detection by combining with the joint combination. The invention improves the accuracy of channel estimation, eliminates the influences of the Doppler frequency shift on correctly receiving demodulation, reduces the error rate and improves the system performance and is particularly suitable for TD-SCDMA terminals under high-speed motion scenes.

Description

The method of Doppler frequency estimation and compensation in TD-SCDMA system

Technical field

The present invention relates to mobile communication technology, relate in particular to estimation and the compensation method of one Doppler frequency shift in TD SDMA (TD-SCDMA) system.

Background technology

TD-SCDMA (TD SDMA) mobile communication system is a kind of 3-G (Generation Three mobile communication system) based on time division duplex, code division multiple access, has that uplink-downlink configuration is flexible, code check is low, availability of frequency spectrum high.

As shown in Figure 1, in TD-SCDMA system, the base unit of transmission data is radio frames.7 conventional time slots (TS0~TS6) and 3 special time slots (descending synchronous code section DwPTS, protection interval GP and uplink synchronous code section UpPTS) subframe of composition, two subframes (subframe #1 and subframe #2) form a radio frames that duration is 10ms.The data of mobile phone users are placed in conventional time slot to be transmitted, and a conventional time slot duration is 675 μ s, is made up of 864 chips (chip), and each chip duration is 0.78125 μ s.These chips are divided into four parts: i.e. the protection interval GP of two data segments (each 352 chips), a midamble code section (midamble) (144 chips) and 16 chip lengths; Each data segment is made up of through spread spectrum, scrambling, aliasing the data of multiple mobile terminal code channels that will transmit; Midamble code section forms after being moved by the basic midamble code bit of system assignment, and its effect is while being used as training sequence for channel estimating.

According to current TD-SCDMA technology, it supports that the maximum translational speed of mobile terminal is 120km/h.But in actual life, there is the bullet train that speed per hour is above up to 250 kilometers, and the high ferro net of higher speed per hour 300km/h~500km/h can spread all over the country in the near future, and this has just proposed very large challenge to existing TD wireless technology.When mobile terminal is during in high-speed motion state, the Doppler frequency shift that the wireless signal of space transmission suffers can become very serious, and along with the rising of carrier frequency, Doppler frequency shift increases, Doppler frequency shift and carrier frequency and speed of mobile terminal are proportional, that is:

f d = f RF × v c × cos θ

Wherein, f drepresent Doppler frequency deviation value, f rFrepresent carrier frequency, v represents the speed of motion of mobile terminals, and c represents the light velocity, equals 3*10 8m/s, θ represents that motion of mobile terminals direction and radio wave incide the angle between mobile terminal.At mobile terminal side, doppler shift effect makes to have produced deviation between the frequency of local demodulation carrier wave and the actual signal receiving of mobile terminal, and deviation in this frequency has just caused the modulation symbol of demodulation symbol and standard in phase place, to occur deflection (distortion) after accumulating in time.For TD system, because it is a low code check system, the duration of each chip is longer especially, so that the demodulation symbol phase distortion of accumulating on each chip also just becomes is larger, this will affect correct reception, the demodulation of mobile terminal widely.

On the other hand, the mobile terminal of TD-SCDMA has generally adopted associated detection technique in the time doing receiving demodulation.Joint-detection utilizes the prior information in multiple access interference to regard the separation of all mobile terminal signals as a unified process, settle the demodulation symbol that the chip signal that the aliasing receiving converts each mobile terminal at one go, thereby reduce the mutual interference of multi-mobile-terminal, increased power system capacity.But the validity of associated detection technique is based upon accurately on channel estimating basis, the realization of existing TD channel estimating has adopted the low-cost fast Fourier transform FFT/ inverse fast Fourier transform IFFT based on Steiner to add that follow-up detection threshold removes the method for noise tap.This technology is at Steiner B.BAIEP. " Low cost channel estimation in the uplink receiver of CDMAmobile radio systems " Frequenz 1993,47 (12): 292-298 and " improvement of low-cost channel estimation methods in the TD-SCDMA system " journals of communicating by letter such as Kang Shaoli, the 23rd volume, there was detailed explanation the 10th phase 125~130.This channel estimation technique is timeslot-based, thinks that channel is changeless in a slot time; But the decline that in fact mobile terminal experiences in the time of motion has been subject to the modulation of Doppler frequency shift, that is to say when in fact channel is in a time slot and to become, with existing method of estimation estimated go out channel value actual be channel mean in a slot time section.Therefore, adopt the estimation channel that this method of estimation obtains just and between real channel to exist error, especially mobile terminal is under the state of high-speed motion, error is very large, if again the estimation channel with error is brought in joint-detection matrix, will cause repeating stack and amplifying of interference, thereby affect being correctly decoded of data.

Summary of the invention

The technical problem to be solved in the present invention is to provide in a kind of TD-SCDMA system to be estimated and compensation method Doppler frequency shift, to overcome the adverse effect of correct reception data being brought due to the movement of mobile terminal.

For addressing the above problem, the invention provides the method for estimation of Doppler frequency deviation value in a kind of TD SDMA TD-SCDMA system, comprising:

Mobile terminal is being received after the time slot that contains this mobile terminal data, obtains the Doppler frequency deviation value of current time slots reception signal by comparing current time slots and a phase difference that compares the channel estimation sequence of time slot.

Further, said method also can have following characteristics:

On described mobile terminal, preserve interval and corresponding with each a scope interval comparison time slot of scope of the absolute value of predefined n Doppler frequency deviation value, wherein, this n scope interval contained the absolute value of all possible Doppler frequency deviation value, n >=1 piecemeal;

Described mobile terminal refers to by the reception signal Doppler frequency deviation value that relatively current time slots and the described relatively phase difference of the channel estimation sequence of time slot obtain this mobile terminal:

The absolute value that judges the anticipation value of the Doppler frequency deviation value of current time slots is positioned at above-mentioned which scope interval;

By the interval definite corresponding comparison time slot of the described scope of judging;

By relatively current time slots and the phase difference estimation of described relatively time slot on corresponding footpath go out the phase pushing figure of the reception signal being caused by Doppler frequency shift in the every chip lengths of this time slot.

Further, said method also can have following characteristics:

The anticipation value of the Doppler frequency deviation value of described current time slots is the Doppler frequency deviation value of a processing time slot on this mobile terminal;

On described this mobile terminal, one processes the Doppler frequency deviation value of time slot and refers to: in this mobile terminal, preserve on processing one contain this mobile terminal data time slot time Doppler frequency deviation value on the most powerful path of estimated this mobile terminal obtaining at this time slot, or this mobile terminal maximum Doppler frequency deviation value or weighted sum of above-mentioned two in each footpath of this time slot.

Further, said method also can have following characteristics:

Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:

Intercept the described relatively training sequence of time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot;

The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal in current time slots;

Described current time slots is carried out to phase place with this mobile terminal part of the average channel impulse response of comparison time slot by corresponding footpath subtracts each other, again divided by the chip-spaced length between above-mentioned two time slots, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every footpath, every chip.

Further, said method also can have following characteristics:

In the time of n=2, described scope interval comprises: A=[0, X), B=[X, + ∞), the corresponding relatively time slot of the interval A of described scope is the time slot with current time slots in a upper subframe with identical timeslot number, the corresponding relatively time slot of described scope interval B is the TS0 time slot in the subframe of current time slots place, wherein, the value of X is determined according to engineering is actual.

Further, said method also can have following characteristics:

Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:

In the time that relatively time slot is the TS0 time slot in this frame, intercept the training sequence of described TS0 time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot; When described relatively time slot is when the time slot in same time slot, to obtain the described relatively average channel impulse response of time slot according to the keeping records of described mobile terminal with current time slots in previous frame;

The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal within the current time slots period;

Described mobile terminal carries out phase place by the channel estimation value of most powerful path in current time slots and described relatively time slot and subtracts each other, again divided by the chip-spaced length of current time slots and described relatively time slot, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every chip.

The present invention also provides the compensation method of Doppler frequency shift in a kind of TD SDMA TD-SCDMA system, comprising:

Mobile terminal is being received after the time slot that contains this mobile terminal data, obtain the Doppler frequency deviation value of current time slots reception signal by comparing current time slots and a phase difference that compares the channel estimation sequence of time slot, and in conjunction with joint-detection, in joint-detection, described reception signal is revised.

Further, said method also can have following characteristics:

On described mobile terminal, preserve interval and corresponding with each a scope interval comparison time slot of scope of the absolute value of predefined n Doppler frequency deviation value, wherein, this n scope interval contained the absolute value of all possible Doppler frequency deviation value, n >=1 piecemeal;

Described mobile terminal refers to by the reception signal Doppler frequency deviation value that relatively current time slots and the described relatively phase difference of the channel estimation sequence of time slot obtain this mobile terminal:

The absolute value that judges the anticipation value of the Doppler frequency deviation value of current time slots is positioned at above-mentioned which scope interval;

By the interval definite corresponding comparison time slot of the described scope of judging;

By relatively current time slots and the phase difference estimation of described relatively time slot on corresponding footpath go out the phase pushing figure of the reception signal being caused by Doppler frequency shift in the every chip lengths of this time slot.

Further, said method also can have following characteristics:

The anticipation value of the Doppler frequency deviation value of described current time slots is the Doppler frequency deviation value of a processing time slot on this mobile terminal;

On described this mobile terminal, one processes the Doppler frequency deviation value of time slot and refers to: in this mobile terminal, preserve on processing one contain this mobile terminal data time slot time Doppler frequency deviation value on the most powerful path of estimated this mobile terminal obtaining at this time slot, or this mobile terminal maximum Doppler frequency deviation value or weighted sum of above-mentioned two in each footpath of this time slot.

Further, said method also can have following characteristics:

Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:

Intercept the described relatively training sequence of time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot;

The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal in current time slots;

Described current time slots is carried out to phase place with this mobile terminal part of the average channel impulse response of comparison time slot by corresponding footpath subtracts each other, again divided by the chip-spaced length between above-mentioned two time slots, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every footpath, every chip.

Further, said method also can have following characteristics:

Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:

In the time that relatively time slot is the TS0 time slot in this frame, intercept the training sequence of described TS0 time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot; When described relatively time slot is when the time slot in same time slot, to obtain the described relatively average channel impulse response of time slot according to the keeping records of described mobile terminal with current time slots in previous frame;

The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal within the current time slots period;

Described mobile terminal carries out phase place by the channel estimation value of most powerful path in current time slots and described relatively time slot and subtracts each other, again divided by the chip-spaced length of current time slots and described relatively time slot, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every chip.

Further, said method also can have following characteristics:

The described reception signal to each mobile terminal is revised specifically and is comprised in joint-detection:

After being multiplied by spreading factor SF, the described phase pushing figure obtaining compensates the average channel impulse response of described each mobile terminal within the current time slots period by footpath;

Multiply each other and obtain respectively the compound spreading code of each mobile terminal by spreading code, channel code, the scrambler of each mobile terminal;

Utilize the compound spreading code tectonic syntaxis of average channel impulse response after described compensation and described each mobile terminal to detect matrix A, and by described joint-detection matrix A, the data segment in current time slots is carried out to joint-detection, obtain revised demodulation symbol.

Further, said method also can comprise:

Do phase bit comparison with planisphere Plays modulation symbol with the described demodulation symbol obtaining, the phase place frequency deviation value of the most powerful path of gained phase difference to each mobile terminal and/or maximum phase place frequency deviation value are made smoothing processing, and the Doppler frequency deviation value using result after treatment as this time slot saves.

Compared with prior art, the present invention has improved the accuracy of channel estimating, has eliminated the impact of Doppler frequency shift on correct receiving demodulation, has reduced the error rate, thereby improve systematic function, and be particularly useful for the scene of TD-SCDMA mobile terminal under high-speed motion.Reconcile the precision of estimating Doppler frequency deviation by selecting suitable comparison time slot, and carry out estimating Doppler frequency deviation by the computing of carrying out phase difference to comparing time slot and current time slots, and in the preferred case, the phase deviation that mobile terminal only carries out to most powerful path (main footpath) the reception signal that Doppler frequency shift causes is estimated and compensates, and has reduced the complexity that method is implemented; In addition, the channel estimation sequence that mobile terminal can also compare time slot by storage further reduces method complexity and overhead.

Brief description of the drawings

Fig. 1 is the frame structure schematic diagram of TD-SCDMA in prior art;

Each footpath that Fig. 2 is wireless channel in the embodiment of the present invention is subject to Doppler frequency shift to modulate the schematic diagram of the phase deviation causing in a conventional time slot section;

Fig. 3 is the flow chart of method in the embodiment of the present invention;

Fig. 4 is Steiner channel estimation sequence and channel window schematic diagram corresponding to each mobile terminal in the embodiment of the present invention;

Fig. 5 is the structure chart of joint-detection A matrix in the embodiment of the present invention;

Fig. 6 is system emulation result in the embodiment of the present invention.

Embodiment

Below in conjunction with drawings and Examples, technical scheme of the present invention is described in detail.

For a TD time slot of propagating on wireless channel, it can be subject to the Convolution Modulation of wireless channel impulse response.This impulse response is made up of two parts: 1, the decline being caused by multipath effect: (675 μ are s) much smaller than the coherence time of space channel, and therefore this part can think in a slot time section it is approximate fixing due to the duration of a TD time slot; 2, the phase deviation being caused by Doppler effect side-play amount 2 π f d kt is linear variation in time in a time slot duration, as shown in Figure 2, and wherein c irepresent i chip on this time slot, each oblique line represent phase pushing figure on corresponding footpath (due to each radially from motion of mobile terminals direction between angle different, the therefore slope of every oblique line, i.e. f d kalso different).Space channel by certain mobile terminal on a slot length launches successively by chip, obtains:

h ( chip _ 1 ) = [ cof fading _ 1 · e - j 2 π f d 1 · t chip _ 1 , cof fading _ 2 · e - j 2 π f d 2 · t chip _ 1 , . . . , co f fading _ L · e - j 2 π f d L · t chip _ 1 · · · · · · · - - - ( 1 ) h ( chip _ 864 ) = [ cof fading _ 1 · e - j 2 π f d t · t chip _ 864 , c of faading _ 2 · e - j 2 π f d 2 · t chip _ 864 , . . . , co f fading _ L · e - j 2 π f d L · t chip _ 864

Wherein, h (chip_i) represents the channel impulse response (span of i is 1~864) on i chip, cof fading_krepresent the fading coefficients in k footpath, represent on k footpath by Doppler frequency shift f d kthe phase pushing figure on i chip causing.

The phase pushing figure of the reception signal below Doppler frequency shift being caused on every chip is referred to as Doppler frequency deviation value.

Before carrying out following step, need do following setting to terminal: in terminal, preserve the scope interval of the absolute value of predefined n (n >=1) Doppler frequency deviation value, the absolute value of all possible Doppler frequency deviation value has been contained in this n scope interval piecemeal; In addition, on it, also preserve and the interval corresponding comparison slot s lot[i of each scope] (value of i is 1~n), be slot[i] corresponding with i scope interval, this corresponding relation can be: along with scope interval is close to infinity gradually, the interval corresponding comparison time slot of each scope is close to current time slots gradually, can be understood as the Doppler frequency deviation value absolute value dropping in a certain scope interval larger, corresponding relatively time slot is the closer to this time slot.Wherein, relatively time slot is current time slots certain time slot before, and it may be both certain time slot that in the subframe of current time slots place, timeslot number is less than current time slots, may be also certain time slot in current time slots place subframe certain subframe before.

Preferably, set n=2, the scope interval of setting Doppler frequency deviation value absolute value is respectively: interval A=[0, X), interval B=[X ,+∞], the value of X can be determined by engineering is actual.Comparison time slot corresponding to interval A is the time slot with current time slots in a upper subframe with identical timeslot number; Comparison time slot corresponding to interval B is the TS0 time slot in the subframe of current time slots place.Why adopting these two time slots time slot as a comparison, is that the channel estimating after so just can ensureing is enforceable because have all the time training sequence in the midamble code section of these two time slots.Certainly, relatively time slot also can be selected current time slots other any time slot before, as the last time slot of current time slots, but need to ensure there is training sequence in the midamble code section of this comparison time slot.

The present invention eliminates the Doppler frequency shift factor by some steps on the impact that mobile terminal correctly receives, demodulation symbol produces, comprising:

(1) absolute value of the Doppler frequency deviation value in anticipation current time slots is positioned at above-mentioned which scope interval;

(2) go out the phase pushing figure of the reception signal being caused by Doppler frequency shift in every chip lengths by comparing the phase difference estimation of the interval corresponding relatively time slot of current time slots and this scope on corresponding footpath;

(3) according to this phase pushing figure in conjunction with existing associated detection technique, eliminate the phase deviation of the receiving symbol that Doppler frequency shift causes by revising A matrix in joint-detection.

(4) receiving symbol is separated to timing, in demodulation, the Doppler frequency deviation estimating is before carried out to fine control.

After execution step (1) and (2), can go out according to a preliminary estimate the Doppler frequency deviation value of this mobile terminal; And can compensate by execution step (3) deviation being caused by Doppler frequency shift follow-up.After execution step (4), estimate more accurately the Doppler frequency deviation value of this mobile terminal on this time slot.

In step (1), the anticipation value of described Doppler frequency deviation be this mobile terminal upper one process time slot estimated go out Doppler frequency deviation value.Under preferable case for process in a upper subframe with current time slots have the time slot of identical timeslot number estimated go out Doppler frequency deviation value.

In step (2), comparison current time slots and the relatively phase difference of time slot on corresponding footpath refer to: the channel estimation sequence that first obtains these two time slots; Then two sequences are carried out mating by footpath; Obtain on corresponding footpath after phase difference, divided by corresponding chip-spaced, obtain the phase pushing figure of this mobile terminal in every footpath, every chip lengths.Wherein, in order to obtain channel estimation sequence, need to intercept midamble code to corresponding time slot, do some actions such as FFT conversion, IFFT inverse transformation, the realization of channel estimating adopts the steiner method after improving, belong to existing technology category, no longer repeat at this.

In addition, current time slots is carried out after channel estimating, this estimated sequence can be preserved.Like this, when follow-up this time slot is as a comparison when time slot, owing to preserving the channel estimation sequence of this time slot in terminal, therefore can omit the channel estimation process to this time slot, directly use this channel estimation sequence channel estimation sequence of time slot as a comparison.

Can find out from step (3), eliminating Doppler frequency shift deviation is to realize in conjunction with prior art-joint-detection of TD.But in the present invention the joint-detection matrix A generating is revised, specifically comprise: the b vector of the A matrix of generation is formed by revised channel estimation sequence and compound spreading code convolution, and revised channel estimation sequence is that in the average channel estimation sequence modulation by estimating, Doppler frequency deviation value forms, ensure that revised channel estimation sequence is no longer changeless in a time slot.

Preferably, under typical TD mobile terminal high-speed motion scene, only need the most powerful path of this mobile terminal be carried out the estimation of phase pushing figure and the channel estimating of most powerful path is revised, and revise joint-detection A matrix, eliminate Doppler frequency shift deviation.

The accuracy of estimating for raising in step (4), at solution timing, the Doppler frequency deviation estimating is before carried out to fine control, and by the maximum in Doppler frequency deviation value or each footpath Doppler frequency deviation value of the most powerful path after fine control the Doppler frequency deviation value as this time slot, and preserve this value and process the Doppler frequency deviation anticipation value of time slot as next in this mobile terminal.

In sum, as shown in Figure 3, each time slot data that what mobile terminal received it comprise this mobile terminal data repeat following steps:

Step 301: on mobile terminal, preserve upper one process the Doppler frequency deviation estimated value of time slot as anticipation value (to the first receiving slot, this anticipation value be 0 or a preassigned value), and determine which scope interval the absolute value of this anticipation value drops on;

Step 302: choose corresponding comparison time slot according to that scope interval falling into, and intercept the training sequence of this comparison time slot, do channel estimating for the first time by improved steiner method, obtain the average channel impulse response of each mobile terminal in this comparison slot time section;

Step 303: intercept the training sequence of this time slot, do secondary channel estimating, estimate the average channel impulse response of each mobile terminal within this time slot period;

Certainly, the order that this time slot and comparison time slot are carried out to channel estimating in no particular order, as long as obtain the average channel impulse response in these two time slots.

Step 304: the channel estimation value of current time slots and comparison time slot is mated by mobile terminal, corresponding footpath, two channel sequence after coupling are carried out phase place by footpath and are subtracted each other, again divided by the chip-spaced length between current time slots and comparison time slot, estimate the phase pushing figure that each mobile terminal that Doppler frequency shift causes receives signal on every footpath, every chip, i.e. the Doppler frequency deviation value of each mobile terminal on every footpath;

Step 305: the phase pushing figure by the every mobile terminal being obtained by step 304 on every footpath, every chip is multiplied by spreading factor SF, obtain the phase deviation factor of every mobile terminal on every footpath, every symbol lengths duration, and by the channel estimation sequence of this factor correction current time slots, carry out convolution algorithm by this revised estimation channel sequence and compound spreading code, build revised joint-detection A matrix;

Step 306: utilize revised A matrix to do joint-detection to the signal of the current time slots receiving, obtain once the demodulation symbol of each mobile terminal.

Step 307: (this standard modulation symbols is the rear standard complex modulation symbol sending of transmitter modulation by hithermost standard modulation symbols in these demodulation symbols and planisphere, for example, concerning QPSK modulation, standard modulation symbols is exactly :+i, 1,-1,-i) doing phase bit comparison, gained phase difference does smoothing processing, obtains phase pushing figure; Then the Doppler frequency deviation value at this time slot upper signal channel most powerful path with this mobile terminal estimating in this phase pushing figure fine tuning step 304;

Step 308: next receiving slot of determining the Doppler frequency deviation value of this time slot and being saved in this mobile terminal makes reference relatively and uses.The Doppler frequency deviation value of described time slot is the Doppler frequency deviation value on the most powerful path of this mobile terminal after step 307 fine tuning, or maximum Doppler frequency deviation value or the weighted sum of above-mentioned two in the each footpath of this mobile terminal.

When mobile terminal is under high-speed motion scene, in above-mentioned steps 305~308, can only the most powerful path of this mobile terminal be carried out the estimation of phase pushing figure and the channel estimating of most powerful path is revised, and revise joint-detection A matrix, to eliminate Doppler frequency shift deviation.

With an instantiation, the present invention is further described below.

Suppose that certain TD mobile terminal is carrying out the voice service of 12.2kbps, this service feature is that this mobile terminal occupies a fixing time slot in each subframe, descending spreading factor SF=16.

Terminal is carried out to initial configuration: preset 2 sections of scope intervals by Doppler frequency deviation absolute value: interval A=[0,1*10 -3radian/chip), interval B=[1*10 -3radian/chip ,+∞).(two interval boundary of selected this equal 1*10 -3radian/chip, the speed of corresponding mobile terminal is 120km/h, maximum doppler frequency fd max222Hz).

Set the comparison time slot in two corresponding scope intervals: corresponding interval A, relatively time slot be in a upper subframe with the time slot of the identical timeslot number of current time slots; Corresponding interval B, relatively time slot is the TS0 time slot of this subframe.

The anticipation value of setting initial Doppler frequency deviation value is 0.

This mobile terminal is repeated below step operation to the time slot that comprises this mobile terminal data in the every subframe receiving:

Step 1: drop in which scope interval and choose accordingly a comparison time slot (for the first subframe according to the absolute value of the Doppler frequency deviation value of this time slot of anticipation, anticipation value is 0, to subframe afterwards, anticipation value is the Doppler frequency deviation value with current time slots in a upper subframe with identical timeslot number time slot)

In the time that anticipation value falls into interval A, think that mobile terminal is in little Doppler frequency deviation state, choose in last subframe the time slot time slot as a comparison with the identical timeslot number of current time slots;

In the time that anticipation value falls into interval B, think that mobile terminal is in large Doppler frequency deviation state, therefore need to do more accurate Doppler frequency deviation and estimate, choose TS0 time slot time slot as a comparison in this subframe.

Step 2: intercept the relatively training sequence of time slot and do channel estimating, obtain each mobile terminal at the average channel response ch_est1 comparing on time slot.The concrete grammar of channel estimating adopts the steiner method after improving, and can be divided into following two sub-steps:

The relatively training sequence receiver_mid of time slot of step 2.1, intercepting 1do FFT conversion, then convert divided by the FFT of basic training sequences mid_basic, result is done to IFFT conversion again, obtain channel estimation sequence (Channel_Estimation):

Channel_Estimation=IFFT(FFT(receiver_mid 1)/FFT(mid_basic))????(2)

Wherein basic training sequences gives each community notice to mobile terminal by system original allocation.

Step 2.2, as shown in Figure 4, the footpath that in channel estimation sequence corresponding to each mobile terminal that step 2.1 is obtained, power is greater than ε is used as noise path and is removed, and remaining sequence ch_est1 is the average channel response of each mobile terminal in time slot relatively.(wherein, ε=r 2σ 2, r 2represent thresholding signal to noise ratio, σ 2represent noise power, the value of r and σ can be chosen according to engineering is actual, r < 1).

When specific implementation, while thering is the time slot of identical timeslot number with current time slots in last subframe when comparing time slot, owing to this time slot was done to channel estimating in the processing of a upper subframe, therefore only need in mobile terminal, increase the storage of this channel estimating, and in this step, read this storage, and without doing again step 2.1 and 2.2;

Step 3: the training sequence that intercepts current time slots does channel estimating, obtains the average channel response ch_est2 of each mobile terminal in current time slots.The concrete grammar of channel estimating adopts the steiner method after improving, and can be divided into two sub-steps (as step 2.1, described in 2.2), repeats no more here.

Obtain after current time slots upper signal channel estimated sequence, store this sequence.

Step 4, the estimated sequence of the average channel response to current time slots and comparison time slot is pressed mobile terminal and footpath coupling respectively, the average channel response of the most powerful path of each mobile terminal is carried out to phase place subtracts each other, again divided by the interval number of chips between current time slots and comparison time slot, the phase pushing figure of reception signal every chip on most powerful path of this mobile terminal that obtains being caused by Doppler frequency shift, i.e. the Doppler frequency deviation value of this mobile terminal on most powerful path:

phase _ estimatio n per chip strongest tap = phase strongest tap ch _ est 2 - phase strongest tap ch _ est 1 N chip - - - ( 3 )

This value can be thought the rough estimate evaluation (also need carry out fine control in step 6) of Doppler frequency deviation.Wherein, phase represents to get phase bit arithmetic, and strongest tap represents most powerful path, i.e. a prominent footpath in the channel response in each footpath, N chiprepresent current time slots and the number of chips of being relatively separated by between time slot:

For the TS0 time slot of choosing this subframe in step 1 time slot of making comparisons, N chip=current time slots sequence number * 864+352, wherein 352 is descending synchronous code, protection interval and three total chip lengths of uplink synchronous code.

For the time slot time slot as a comparison of choosing identical timeslot number in a subframe in step 1, between current time slots and relatively time slot, be spaced apart a sub-frame length, chip-spaced N chip=6400.

In this embodiment, preferably only the Doppler frequency deviation value of the most powerful path to each terminal use is estimated, adopts method for optimizing can reduce the complexity that terminal realizes; The reason of its establishment is under typical mobile terminal high-speed motion scene, the general wireless signal that all exists a line of sight (be radio wave can from antenna for base station direct projection arrive mobile terminal), this line of sight is the principal element that affects received signal quality, that is the most powerful path estimating;

Step 5: the above-mentioned reception signal estimating phase pushing figure of every chip on most powerful path is multiplied by spreading factor, revise the channel estimation sequence of current time slots, and carry out convolution algorithm by revised channel estimation sequence with compound spreading code, form the joint-detection A matrix of revising.Specifically be divided into four sub-step ` rapid:

Step 5.1, received signal phase pushing figure of every chip on most powerful path and be multiplied by spreading factor SF obtaining by step 4, obtain receiving the phase deviation factor of signal on the every symbol of most powerful path:

phase _ estimatio n per symbol strongest tap = SF * phase _ estimatio n per chip strongest tap - - - ( 4 )

Step 5.2, will receive on the most powerful path of the current time slots average channel estimation sequence that the phase pushing figure of signal on the every symbol lengths of most powerful path obtain in compensating to step 3, obtain revised channel estimation sequence:

channel _ estimatio n &prime; symbol _ n tap _ strongest = channel _ estimati on strongest tap * e - j * 2 &pi; * n * phase _ estimation per symbol strongest tap - - - ( 5 )

Wherein, channel_estimation strongest tapbe illustrated in the most powerful path of this mobile terminal obtaining in step 3 in current time slots average channel estimation, n represents n modulation symbol.

Revised channel estimation sequence is no longer changeless in this time slot, but by sign bit received estimated go out the modulation of Doppler frequency deviation.

Step 5.3, the spreading code by each mobile terminal, channel code, scrambler multiply each other and obtain respectively the compound spreading code of each mobile terminal c user = ( c 1 user . . . c SF user ) :

c i user = spreading _ code i user * channeliasation _ code i * scrambling _ code i - - - ( 6 )

The compound spreading code of the each mobile terminal generating in step 5.4, the revised channel estimation sequence of utilizing acquisition in step 5.2 and step 5.3 carrys out tectonic syntaxis and detects matrix A.

The structure of A matrix is with reference to Fig. 5.It is made up of N V piece, and N represents the number of modulation symbol, and each V piece is arranged in by U b vector, and U represents mobile terminal number, and each b vector is obtained by revised channel estimating and compound spreading code convolution:

b &RightArrow; symbol _ n user _ u = Channel _ Estimatio n &prime; symbol _ n user _ u &CircleTimes; c user _ u - - - ( 7 )

Wherein, Channel_Estimation symbol_n user_urepresent channel estimating after the correction of u mobile terminal on n symbol, c user_urepresent u the compound spreading code of mobile terminal; represent convolution algorithm.

Step 6: utilize revised A matrix to do joint-detection to the data segment of current time slots, obtain the demodulation symbol of each mobile terminal

d = ( I + &sigma; - 2 A H A ) - 1 &CenterDot; A H e - - - ( 8 )

Realized the Doppler frequency shift of demodulation symbol has been eliminated.Wherein, I representation unit matrix, σ represents noise power, e represents the data segment chip receiving; A hthe hermitian conversion of representing matrix A, A -1the inverse transformation of representing matrix A.

Step 7: in order to obtain more accurate Doppler frequency deviation estimated value, to the rough estimate evaluation of the Doppler frequency deviation estimating in step 4 tune of running business into particular one, specifically comprise the following steps:

A, the demodulation symbol obtaining in step 6 is done to phase bit comparison with the modulation symbol of standard, gained phase difference does smoothing processing, and the rough estimate evaluation of acquired results fine tuning Doppler frequency deviation, specifically comprises:

A1, will obtain demodulation symbol with the modulation symbol d of standard stdphase place compare, gained phase difference does on average:

Δphase′=AVG(phase(d)-phase(d std))????(9)

Herein, AVG represents the computing being averaging, and specifically refers to that the demodulation symbol that all (all users) obtained by joint-detection does on average.

A2, respectively the rough estimate evaluation that estimates Doppler frequency deviation in step 4 is carried out to fine tuning with obtained Δ phase ':

&Delta;phase _ estimatio n per chip tap _ strongest = phase _ estimatio n per chip tap _ strongest + &Delta; phase &prime; SF - - - ( 10 )

This value can be thought be the Doppler frequency deviation value of this mobile terminal on this time slot, can obtain Doppler frequency shift value f according to this value d.

B, by the phase pushing figure Δ phase_estimation of most powerful path after the adjustment obtaining in steps A 2 per chip tap_strongest, be saved in mobile terminal the anticipation amount while processing as next subframe as the Doppler frequency deviation value of this time slot.

To next son frame data repeating step 1-7.

As shown in Figure 6, can find out, adopt after the method for the invention, the error rate of mobile terminal obviously reduces.

Certainly; the present invention also can have other various embodiments; in the situation that not deviating from spirit of the present invention and essence thereof; those of ordinary skill in the art are when making according to the present invention various corresponding changes and distortion, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.

Claims (14)

1. a method of estimation for Doppler frequency deviation value in TD SDMA TD-SCDMA system, is characterized in that,
Mobile terminal is being received after the time slot that contains this mobile terminal data, calculates the relatively phase difference of the channel estimation sequence of time slot of current time slots and, obtains the Doppler frequency deviation value of current time slots reception signal;
Wherein, in described mobile terminal, be preset with the absolute value and the corresponding relation that compares time slot of Doppler frequency deviation value;
The relatively phase difference of the channel estimation sequence of time slot of described calculating current time slots and, comprising: choose corresponding comparison time slot according to the absolute value of the anticipation value of the Doppler frequency deviation value of current time slots;
The anticipation value of the Doppler frequency deviation value of described current time slots is the Doppler frequency deviation value that on this mobile terminal, a processing time slot obtains.
2. the method for claim 1, is characterized in that,
Described calculating current time slots and one compares the phase difference of the channel estimation sequence of time slot, obtains the Doppler frequency deviation value of current time slots reception signal, also comprises:
Calculate current time slots and the phase difference of described relatively time slot on corresponding footpath, the phase difference calculating, divided by described current time slots and the chip-spaced length of time slot relatively, is drawn to signal that described mobile terminal the receives phase pushing figure in the every chip lengths of this time slot.
3. method as claimed in claim 2, is characterized in that,
The absolute value of default Doppler frequency deviation value and the corresponding relation that compares time slot in described mobile terminal, specifically comprise:
Interval and corresponding with each a scope interval comparison time slot of scope of the absolute value of n Doppler frequency deviation value, wherein, this n scope interval contained the absolute value of all possible Doppler frequency deviation value, n >=1 piecemeal.
4. method as claimed in claim 2, is characterized in that,
On described this mobile terminal, one processes the Doppler frequency deviation value that obtains of time slot and refers to: in this mobile terminal, preserve on processing one contain this mobile terminal data time slot time Doppler frequency deviation value on the most powerful path of estimated this mobile terminal obtaining at this time slot, or this mobile terminal maximum Doppler frequency deviation value or weighted sum of above-mentioned two in each footpath of this time slot.
5. method as claimed in claim 2, is characterized in that,
Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:
Intercept the described relatively training sequence of time slot, do channel estimating, estimate the average channel impulse response of mobile terminal in this comparison time slot;
The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of mobile terminal in current time slots;
Described current time slots is carried out to phase place with this mobile terminal part of the average channel impulse response of comparison time slot by corresponding footpath subtracts each other, again divided by the chip-spaced length between above-mentioned two time slots, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every footpath, every chip.
6. method as claimed in claim 3, is characterized in that,
In the time of n=2, described scope interval comprises: A=[0, X), B=[X, + ∞), the corresponding relatively time slot of the interval A of described scope is the time slot with current time slots in a upper subframe with identical timeslot number, the corresponding relatively time slot of described scope interval B is the TS0 time slot in the subframe of current time slots place, wherein, the value of X is determined according to engineering is actual.
7. method as claimed in claim 6, is characterized in that,
Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:
In the time that relatively time slot is the TS0 time slot in this frame, intercept the training sequence of described TS0 time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot; When described relatively time slot is when the time slot in same time slot, to obtain the described relatively average channel impulse response of time slot according to the keeping records of described mobile terminal with current time slots in previous frame;
The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal within the current time slots period;
Described mobile terminal carries out phase place by the channel estimation value of most powerful path in current time slots and described relatively time slot and subtracts each other and obtain phase difference, again divided by the chip-spaced length of current time slots and described relatively time slot, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every chip.
8. a compensation method for Doppler frequency shift in TD SDMA TD-SCDMA system, is characterized in that,
Mobile terminal is being received after the time slot that contains this mobile terminal data, obtain the Doppler frequency deviation value of current time slots reception signal by comparing current time slots and a phase difference that compares the channel estimation sequence of time slot, and in conjunction with joint-detection, in joint-detection, described reception signal is revised;
Wherein, on described mobile terminal, preserve interval and corresponding with each a scope interval comparison time slot of scope of the absolute value of predefined n Doppler frequency deviation value, wherein, this n scope interval contained the absolute value of all possible Doppler frequency deviation value, n >=1 piecemeal;
Obtain the Doppler frequency deviation value of current time slots reception signal by comparing current time slots and a phase difference that compares the channel estimation sequence of time slot, comprise: the absolute value that judges the anticipation value of the Doppler frequency deviation value of current time slots is positioned at above-mentioned which scope interval, by the interval definite corresponding comparison time slot of the described scope of judging;
The anticipation value of the Doppler frequency deviation value of described current time slots is the Doppler frequency deviation value that on this mobile terminal, a processing time slot obtains.
9. method as claimed in claim 8, is characterized in that,
Described mobile terminal obtains the reception signal Doppler frequency deviation value of this mobile terminal by comparing current time slots and the described relatively phase difference of the channel estimation sequence of time slot, also comprise:
By comparing current time slots and the phase difference of described relatively time slot on corresponding footpath, the phase difference relatively obtaining, divided by described current time slots and the chip-spaced length that compares time slot, is estimated to the phase pushing figure of the reception signal being caused by Doppler frequency shift in the every chip lengths of this time slot.
10. method as claimed in claim 9, is characterized in that,
On described this mobile terminal, one processes the Doppler frequency deviation value that obtains of time slot and refers to: in this mobile terminal, preserve on processing one contain this mobile terminal data time slot time Doppler frequency deviation value on the most powerful path of estimated this mobile terminal obtaining at this time slot, or this mobile terminal maximum Doppler frequency deviation value or weighted sum of above-mentioned two in each footpath of this time slot.
11. methods as claimed in claim 9, is characterized in that,
Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:
Intercept the described relatively training sequence of time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot;
The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal in current time slots;
This mobile terminal part of described current time slots and the relatively average channel impulse response of time slot is carried out to phase place by corresponding footpath subtracts each other and obtains phase difference, again divided by the chip-spaced length between above-mentioned two time slots, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every footpath, every chip.
12. methods as claimed in claim 9, is characterized in that,
Described mobile terminal obtains this mobile terminal by comparison current time slots and the described relatively phase difference of the channel estimation sequence of time slot and specifically comprises in the Doppler frequency deviation value of current time slots reception signal:
In the time that relatively time slot is the TS0 time slot in this frame, intercept the training sequence of described TS0 time slot, do channel estimating, estimate the average channel impulse response of each mobile terminal in this comparison time slot; When described relatively time slot is when the time slot in same time slot, to obtain the described relatively average channel impulse response of time slot according to the keeping records of described mobile terminal with current time slots in previous frame;
The training sequence that intercepts current time slots, does channel estimating, estimates the average channel impulse response of each mobile terminal within the current time slots period;
Described mobile terminal carries out phase place by the channel estimation value of most powerful path in current time slots and described relatively time slot and subtracts each other and obtain phase difference, again divided by the chip-spaced length of current time slots and described relatively time slot, obtain this mobile terminal that Doppler frequency shift causes phase of received signal side-play amount on every chip.
13. methods as described in any one in claim 9~12, is characterized in that,
The described reception signal to each mobile terminal is revised specifically and is comprised in joint-detection:
After being multiplied by spreading factor SF, the described phase pushing figure obtaining compensates the average channel impulse response of described each mobile terminal within the current time slots period by footpath;
Multiply each other and obtain respectively the compound spreading code of each mobile terminal by spreading code, channel code, the scrambler of each mobile terminal;
Utilize the compound spreading code tectonic syntaxis of average channel impulse response after described compensation and described each mobile terminal to detect matrix A, and by described joint-detection matrix A, the data segment in current time slots is carried out to joint-detection, obtain revised demodulation symbol.
14. methods as claimed in claim 13, is characterized in that, also comprise:
Do phase bit comparison with planisphere Plays modulation symbol with the described demodulation symbol obtaining, the phase place frequency deviation value of the most powerful path of gained phase difference to each mobile terminal and/or maximum phase place frequency deviation value are made smoothing processing, and the Doppler frequency deviation value using result after treatment as this time slot saves.
CN200910006579.1A 2009-02-19 2009-02-19 Doppler frequency shift estimation and compensation method in TD-SCDMA (Time Division-Synchronization Code Division Multiple Access) system CN101814931B (en)

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