CN101478328B - Method and apparatus for frequency bias estimation and compensation - Google Patents
Method and apparatus for frequency bias estimation and compensation Download PDFInfo
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- CN101478328B CN101478328B CN200810241990A CN200810241990A CN101478328B CN 101478328 B CN101478328 B CN 101478328B CN 200810241990 A CN200810241990 A CN 200810241990A CN 200810241990 A CN200810241990 A CN 200810241990A CN 101478328 B CN101478328 B CN 101478328B
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Abstract
The invention discloses a frequency-offset estimation and compensation method and a device. The frequency-offset estimation and compensation method comprises the steps as follows: random access information is processed to obtain all multi-path energy of each signature led by the random access information; whether the signature is effective is judged and effective signatures are filtered, the effective signatures are processed through frequency-offset estimation by utilizing interpolation calculation, thereby demodulating the random access information; marks at an information control part of a presetting quantity time slot of the random access information are utilized to perform frequency-offset estimation, and then the obtained frequency-offset is utilized to compensate for an information data part of the random access information and the remainder information control part; and the remainder information control part that is processed through frequency-offset compensation is processed through channel estimation, and the information data part is compensated for by using a channel estimation result. The frequency-offset estimation and compensation method and the device adopt secondary frequency-offset compensation, lead the accuracy of the frequency-offset estimation to be higher, and increase the information demodulating performance.
Description
Technical field
The present invention relates to wireless communication technology field, relate in particular to a kind of under high-speed case CDMA system cut-in channel frequency offset estimating and compensation method and device.
Background technology
Along with the fast development of mobile communication technology, people require increasingly highly to the quality of mobile communication and the type of service that provides thereof, and the proposition of 3-G (Generation Three mobile communication system) and development thereof have met people's this demand just, therefore get most of the attention.(Wideband Code-Division Multiple-Access WCDMA) is 3-G (Generation Three mobile communication system) standardization body (3 to WCDMA
RdGeneration Partnership Project; Radio Transmission Technology (the Radio Transmission Technology that 3GPP) proposes; RTT) scheme, it not only can provide high-quality language service, and can provide and the similar multimedia service of fixed network.
Yet in GSM, when travelling carriage was communicated by letter at the volley, the frequency of base station received signal can change, and is called Doppler effect.Because the caused Doppler frequency skew of Doppler effect is obvious especially when the travelling carriage high-speed mobile, communication causes and seriously influences to WCDMA.Such as, in high-speed railway, if train speed is 350 kilometers/hour, carrier frequency is 1.95GHZ, then the skew of the maximum doppler frequency of receiving terminal can reach 1264Hz.
Therefore, frequency deviation is estimated in the industry conception that propose to start more detection of preamble task.
See also Fig. 1, it is a WCDMA system cut-in channel signal schematic representation.
In the WCDMA system, access channel is a very important part, and professional beginning all is after inserting through access channel earlier, to set up service link again.The signal that the access channel receiving system will detect comprises leading and message two parts.Wherein, leading signature repetition by 16 bits constitutes for 256 times.The every frame 10ms of message part comprises 15 time slots.Message part comprises message control section and message data part, each message control section and message data part correspondingly corresponding a time slot.
In existing detection of preamble technology; Usually more preset i frequency deviation
carried out compensate of frequency deviation to received signal; Its i=1; 2,3.......For certain signature, corresponding each frequency deviation
A ceiling capacity E is all arranged
iIf E
iMaximum in the ceiling capacity in i, then with E
iCorresponding
As the frequency offset estimating value of this time detection of preamble, and on this frequency deviation, search for multipath, and then, estimate that like this frequency deviation of coming out is very coarse, thereby reduced the message demodulation performance the initial compensation frequency deviation of this frequency deviation as the message part demodulation.
See also Fig. 2, it is the sketch map of noise to the detection of preamble energy affect.
The detection of preamble task of three different frequency deviations is set, and frequency deviation is spaced apart 600Hz, carries out detection of preamble, and the maximum leading energy number of times of detection of preamble is carried out probability statistics.Can know that by figure when leading signal to noise ratio reduced gradually, the accurate percentage of maximum leading energy of demodulation also reduced gradually.Promptly because The noise, cause with the immediate frequency deviation corresponding energy that presets of signal frequency deviation that receives not be maximum, the leading energy that noise comes out to demodulation has certain influence, thereby influences the accuracy of frequency offset estimating, has reduced the message demodulation performance.
Summary of the invention
The problem that accuracy is low, the message demodulation performance is low for the frequency offset estimating that solves above-mentioned frequency offset estimating and compensation method is necessary to provide a kind of accuracy of frequency offset estimating higher, the frequency offset estimating and the compensation method of message demodulation better performances.
In addition, also be necessary to provide a kind of above-mentioned frequency offset estimating and compensation arrangement.
Frequency offset estimating of the present invention and compensation method may further comprise the steps:
Handling random accessing message in the said step 1 comprises: to said random accessing message and scrambler multiply each other accomplish descrambling, with frequency offseting value multiply each other accomplish separate frequency deviation, with different signatures multiply each other completion separate signature, by given length completion coherent integration.
Judge in the said step 2 whether said signature effectively comprises: each multipath energy and the predefined fixed gate limit value of each said signature are compared; Energy is greater than the effective multipath of being recorded as of fixed gate limit value; If at least one multipath energy of signature is greater than the fixed gate limit value; Then said signature is effectively to sign, otherwise said signature is an invalid signature.
Interpolation calculation comprises described in the said step 2: choose maximum multipath energy and corresponding preset frequency deviation thereof earlier; Choose preset frequency deviation adjacent and the adjacent corresponding maximum separately multipath energy of preset frequency deviation again, then selected multipath energy and corresponding preset frequency deviation are carried out interpolation calculation with said preset frequency deviation.
Frequency offset estimating comprises in the said step 3: elder generation carries out depolarising to the pilot tone of the message control section of said predetermined number time slot and handles, and the depolarising process result that adds up is again carried out frequency offset estimating.
Frequency offset estimating of the present invention and compensation arrangement comprise a frequency deviation estimating modules; Said frequency deviation estimating modules receives random accessing message; Said frequency deviation estimating modules is used for the symbol of the message control section of the predetermined number time slot of said random accessing message is carried out frequency offset estimating, and with the message data part and remaining message control section of the said random accessing message of compensate of frequency deviation of gained.
Said frequency deviation estimating modules is carried out depolarising to the symbol of the message control section of said predetermined number time slot earlier and is handled, and the depolarising process result that adds up is again carried out frequency offset estimating.
Said frequency offset estimating and compensation arrangement comprise a channel estimation module, and said channel estimation module is to carrying out channel estimating through the said remaining message control section of compensate of frequency deviation, compensate said message data part with the result of said channel estimating.
Said random accessing message is the random accessing message through a compensate of frequency deviation.
Described frequency offset estimating and compensation arrangement comprise an access device; Said access device is used to receive and handle the random accessing message without the overdeviation compensation; Obtain all multipath energies of each leading signature of message; Whether effectively also said frequency deviation estimating modules judges the said signature effective signature of screening; Utilize interpolation calculation to estimate frequency deviation to said effective signature, and then the said random accessing message without the overdeviation compensation of demodulation, said random accessing message obtained through a compensate of frequency deviation.
Compared with prior art; Compensate of frequency deviation is adopted in frequency offset estimating of the present invention and compensation method twice, utilizes interpolation calculation to estimate frequency deviation for the first time, preliminary demodulation random accessing message; After handling, each pilot tone of choosing for the second time the part message control section of random accessing message obtains frequency deviation; Use the compensate of frequency deviation message data part and remaining message control section of gained then, the remaining message control section through compensate of frequency deviation is carried out channel estimating, compensate said message data part with the result of said channel estimating; Thereby make that the accuracy of frequency offset estimating is higher, improved the message demodulation performance.
After the detailed description that combines the advantages embodiment of the present invention, it is clearer that characteristics of the present invention and advantage will become.
Description of drawings
Fig. 1 is a WCDMA system cut-in channel signal schematic representation;
Fig. 2 is the sketch map of noise to the detection of preamble energy affect;
Fig. 3 is the schematic flow sheet of frequency offset estimating of the present invention and compensation method;
Fig. 4 is the performance simulation curve chart that utilizes the present invention and prior art to obtain respectively;
Fig. 5 is the organigram of frequency offset estimating of the present invention and compensation arrangement.
Embodiment
Below in conjunction with accompanying drawing frequency offset estimating of the present invention and compensation method and device are described.
See also Fig. 3, it is the schematic flow sheet of frequency offset estimating of the present invention and compensation method.
Frequency offset estimating of the present invention and compensation method comprise the steps:
Step S1, handle random accessing message, obtain all multipath energies of each leading signature of said random accessing message;
Accomplish through random accessing message and scrambler are multiplied each other descrambling, with frequency offseting value multiply each other accomplish separate frequency deviation, with different signatures multiply each other accomplish separate signature, by given length completion coherent integration, obtain the energy of all multipaths of each signature.
Step S2, judge that whether effectively and the effective signature of screening said signature, utilizes interpolation calculation to estimate frequency deviation to said effective signature, and then the said random accessing message of demodulation;
For each signature, with its each multipath energy and predefined fixed gate limit value relatively, energy is greater than the effective multipath of being recorded as of fixed gate limit value, and the multipath that will be not more than the fixed gate limit value is given up.
All multipath energies of a signature all are not more than the fixed gate limit value, explain then that this is signed to be invalid signature.If at least one multipath energy of signature is explained then that this is signed and is effective signature greater than the fixed gate limit value.
To adjudicating effective signature, choose the maximum E of multipath energy
iCorresponding preset frequency deviation Δ f
i, select and Δ f again
iAdjacent preset frequency deviation Δ f
I-1, Δ f
I+1, and Δ f
I-1Corresponding several multipath energy is chosen wherein maximum E
I-1, Δ f
I+1Corresponding several multipath energy is selected wherein maximum E
I+1Utilize Δ f
I-1, Δ f
i, Δ f
I+1And corresponding E
I-1, E
i, E
I+1Carry out interpolation calculation, draw the peaked maximum E of all multipath energies
MaxAnd estimate frequency deviation with this.Choose E
MaxCorresponding multipath is transfered from one place to another under escort the accent random accessing message with the frequency deviation that estimation is come out.
Step S3, utilize the symbol of message control section of the predetermined number time slot of said random accessing message to carry out frequency offset estimating, use the message data part and remaining message control section of the said random accessing message of compensate of frequency deviation of gained then;
Message part comprises N time slot, selects that (each pilot tone of the message control section of 0＜n＜N) is carried out depolarising and handled, and adds up and passes through the pilot tone after the depolarising, and carry out frequency offset estimating one time through the predetermined number n time slot after the demodulation.
The adjacent two symbols (symbol) of the message control section that the p bar directly receives is S
P, 1And S
P, 2, wherein p is the multipath numbering, 1,2 is respectively symbol count.And
Wherein a and θ
1Represent the amplitude and the phase deviation of the 1st symbol in p bar footpath respectively, b with represent p the bar directly amplitude and the phase deviation θ of the 2nd symbol respectively
1+ θ
2, θ
3Represent the phase difference of two symbols, * representes complex conjugate.S
P, 1And S
P, 2Complex conjugate multiplies each other:
Wherein, * is a complex conjugate, tries to achieve S
P, 1To S
P, 2The size of phase rotated.After depolarization, the message control section symbol in p bar footpath is with SMsgCtrl (k) expression, and then the auto-correlation function Rp (d) of SMsgCtrl (k) is:
Wherein, * representes complex conjugate, and d representes related symbol at interval, and K representes current recent news control section symbol subscript, and L representes to be used for calculating the message control section symbolic number of auto-correlation function.
Estimate that frequency deviation Foffset is:
Wherein, d＞0, angle is for getting the phase angle function, and angle is unit with the radian, and Tsymbol is the time that d message control section symbol continues, and is d/15000 second, and the unit of frequency deviation Foffset is Hz., each time also can carry out suitable IIR filtering between estimating.
Owing to carried out compensate of frequency deviation at step S2, promptly frequency deviation Foffset carries out certain compensate of frequency deviation residual frequency deviation afterwards, so numerical value is less.And, when phase angle a hour, a=tg (a), so:
Again with the frequency deviation Foffset compensation message data part of estimating out and the message control section of a remaining N-n time slot.
Step S4, to carrying out channel estimating through the said remaining message control section of compensate of frequency deviation, compensate said message data part with the result of said channel estimating.
Message control section to through remaining N-n time slot of overcompensation carries out channel estimating, and compensates the data division of message with the result of channel estimating.
See also Fig. 4, it is the performance simulation curve chart that utilizes the present invention and prior art to obtain respectively.
At message part is 360bits, Transmission Time Interval TTI=20ms, and fading environment is under the condition of case3, utilizes the performance simulation curve chart that frequency offset estimating of the present invention and compensation method obtain and the performance simulation curve chart of prior art.Can know by figure, when same noise level, adopt the error rate of the simulation curve that frequency offset estimating of the present invention and compensation method obtain low than the simulation curve that prior art obtains.
See also Fig. 5, it is the organigram of frequency offset estimating of the present invention and compensation arrangement.
Frequency offset estimating and compensation arrangement comprise an access device 101, one frequency deviation estimating modules 102 and a channel estimation module 103.Wherein, Access device 101 accomplish through random accessing message and scrambler are multiplied each other descrambling, with frequency offseting value multiply each other accomplish separate frequency deviation, with different signatures multiply each other accomplish separate signature, by given length completion coherent integration, obtain the energy of all multipaths of each signature.Frequency deviation estimating modules 102 is accomplished twice compensate of frequency deviation; At first; Whether effectively also it judge the said signature effective signature of screening, utilizes interpolation calculation to estimate frequency deviation to said effective signature, and then the said random accessing message of demodulation; Utilize the symbol of message control section of the predetermined number time slot of said random accessing message to carry out frequency offset estimating again, use the message data part and remaining message control section of the said random accessing message of compensate of frequency deviation of gained then.Channel estimation module 103 is used for carrying out channel estimating through the said remaining message control section of compensate of frequency deviation, compensates said message data part with the result of said channel estimating.
Compared with prior art; Frequency offset estimating of the present invention and compensation method are adopted twice compensate of frequency deviation with device, utilize interpolation calculation to estimate frequency deviation for the first time, preliminary demodulation random accessing message; After handling, each pilot tone of choosing for the second time the part message control section of random accessing message obtains frequency deviation; Use the compensate of frequency deviation message data part and remaining message control section of gained then, the remaining message control section through compensate of frequency deviation is carried out channel estimating, compensate said message data part with the result of said channel estimating; Thereby make that the accuracy of frequency offset estimating is higher, improved the message demodulation performance.In addition, estimate that for the first time frequency deviation only utilizes three energy values and corresponding preset frequency deviation to carry out interpolation computing method, reduced the complexity of processing.
More than be merely preferred case study on implementation of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. frequency offset estimating and compensation method is characterized in that, may further comprise the steps:
Step 1, handle random accessing message, obtain all multipath energies of each leading signature of said random accessing message;
Step 2, judge that whether effectively and the effective signature of screening said signature, utilizes interpolation calculation to estimate frequency deviation to said effective signature, and then the said random accessing message of demodulation;
Step 3, utilize the symbol of message control section of the predetermined number time slot of said random accessing message to carry out frequency offset estimating, use the message data part and remaining message control section of the said random accessing message of compensate of frequency deviation of gained then;
Step 4, to carrying out channel estimating through the said remaining message control section of compensate of frequency deviation, compensate said message data part with the result of said channel estimating.
2. frequency offset estimating according to claim 1 and compensation method; It is characterized in that, handle in the said step 1 random accessing message comprise to said random accessing message and scrambler multiply each other accomplish descrambling, with frequency offseting value multiply each other accomplish separate frequency deviation, with different signatures multiply each other completion separate signature, by given length completion coherent integration.
3. frequency offset estimating according to claim 1 and compensation method; It is characterized in that judge in the said step 2 whether said signature effectively comprises: each multipath energy and the predefined fixed gate limit value of each said signature are compared, and energy is greater than the effective multipath of being recorded as of fixed gate limit value; If at least one multipath energy of signature is greater than the fixed gate limit value; Then said signature is effectively to sign, otherwise said signature is an invalid signature.
4. frequency offset estimating according to claim 1 and compensation method; It is characterized in that; Interpolation calculation comprises described in the said step 2: choose maximum multipath energy and corresponding preset frequency deviation thereof earlier; Choose preset frequency deviation adjacent and the adjacent corresponding maximum separately multipath energy of preset frequency deviation again, then selected multipath energy and corresponding preset frequency deviation are carried out interpolation calculation with said preset frequency deviation.
5. frequency offset estimating according to claim 1 and compensation method; It is characterized in that; Frequency offset estimating comprises in the said step 3: elder generation carries out the depolarising processing to the symbol of the message control section of said predetermined number time slot, and the depolarising process result that adds up is again carried out frequency offset estimating.
6. frequency offset estimating and compensation arrangement; It comprises a frequency deviation estimating modules; Said frequency deviation estimating modules receives random accessing message, it is characterized in that, also comprises an access device; Said access device is used to receive and handle the random accessing message without the overdeviation compensation, obtains all multipath energies of each leading signature of message;
Whether effectively also said frequency deviation estimating modules is used to judge the said signature effective signature of screening; Utilize interpolation calculation to estimate frequency deviation to said effective signature; And then the said random accessing message without the overdeviation compensation of demodulation, obtain said random accessing message through a compensate of frequency deviation; Symbol to the message control section of the predetermined number time slot of said random accessing message carries out frequency offset estimating, and with the message data part and remaining message control section of the said random accessing message of compensate of frequency deviation of gained;
Also comprise a channel estimation module, said channel estimation module is to carrying out channel estimating through the said remaining message control section of compensate of frequency deviation, compensates said message data part with the result of said channel estimating.
7. frequency offset estimating according to claim 6 and compensation arrangement; It is characterized in that; Said frequency deviation estimating modules is carried out depolarising to the symbol of the message control section of said predetermined number time slot earlier and is handled, and the depolarising process result that adds up is again carried out frequency offset estimating.
8. frequency offset estimating according to claim 6 and compensation arrangement is characterized in that, the random accessing message that said frequency deviation estimating modules is carried out frequency offset estimating is the random accessing message through a compensate of frequency deviation.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0732022B1 (en) * | 1994-10-04 | 2003-06-11 | Motorola, Inc. | Method and apparatus for coherent communication reception in a spread-spectrum communication system |
| CN1988526A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for multiple input multiple output orthogonal frequency division multiplex radio system |
| CN101022674A (en) * | 2007-03-20 | 2007-08-22 | 中兴通讯股份有限公司 | Random place in channel frequency deviation estimation and compensation method |
| CN101102293A (en) * | 2007-07-31 | 2008-01-09 | 北京天碁科技有限公司 | A frequency deviation estimation device and method |
| CN101184075A (en) * | 2007-12-13 | 2008-05-21 | 华为技术有限公司 | Frequency deviation compensation method and device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0732022B1 (en) * | 1994-10-04 | 2003-06-11 | Motorola, Inc. | Method and apparatus for coherent communication reception in a spread-spectrum communication system |
| CN1988526A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for multiple input multiple output orthogonal frequency division multiplex radio system |
| CN101022674A (en) * | 2007-03-20 | 2007-08-22 | 中兴通讯股份有限公司 | Random place in channel frequency deviation estimation and compensation method |
| CN101102293A (en) * | 2007-07-31 | 2008-01-09 | 北京天碁科技有限公司 | A frequency deviation estimation device and method |
| CN101184075A (en) * | 2007-12-13 | 2008-05-21 | 华为技术有限公司 | Frequency deviation compensation method and device |
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