CN102158447A - Scrambling code number detection method and device - Google Patents
Scrambling code number detection method and device Download PDFInfo
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- CN102158447A CN102158447A CN2010101119880A CN201010111988A CN102158447A CN 102158447 A CN102158447 A CN 102158447A CN 2010101119880 A CN2010101119880 A CN 2010101119880A CN 201010111988 A CN201010111988 A CN 201010111988A CN 102158447 A CN102158447 A CN 102158447A
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Abstract
The invention discloses a scrambling code number detection method, which comprises the following steps of: descrambling orthogonal frequency division multiplexing (OFDM) effective sub-carriers obtained by OFDM symbols received in a current timeslot by adopting each scrambling code respectively, and extracting continuous pilot sub-carriers or discrete pilot sub-carriers corresponding to each scrambling code from each descrambled OFDM effective sub-carrier respectively; and determining a scrambling code number of the current timeslot by using the power of the continuous pilot sub-carriers or discrete pilot sub-carriers corresponding to each scrambling code to finish the detection of the scrambling code number. The invention also discloses a scrambling code number detection device. By the method and the device, the problem that a receiver cannot rapidly and effectively obtain the scrambling code number of the current timeslot is effectively solved, so synchronous signal transmission between the receiver and a transmitter can be ensured to be finished smoothly.
Description
Technical field
The present invention relates to the OFDM communications field, relate in particular to a kind of scrambler detection method and device.
Background technology
Mobile TV is the business of watching TV with the mobile phone with video support function.At present, the realization of mobile phone TV services mainly contains three approach:
(1) based on mobile network's realization technology: the mobile phone TV services released of the U.S. and Chinese operator at present mainly are to rely on existing mobile network to realize, for example, China Mobile and CHINAUNICOM all respectively based on its GPRS network and CDMA1X network, utilize the mobile flow medium technology to release mobile phone TV services.
(2) satellite-based realization technology: this class technology provides downlink transfer via satellite, realizes the mobile phone TV services of broadcast mode, and the user just can realize the reception of multi-medium data by the module of integrated direct receiving satellite signal on mobile phone terminal; Typical technology comprises the S-DVB in Europe and the S-DMB of Japan and Korea S etc.
(3) based on the realization technology of received terrestrial digital broadcasting net: this type of technology mainly produces at the received terrestrial digital broadcasting TV, and the frequency of use is generally the radio and television frequency range.
China Mobile multimedia broadcasting (CMMB, China Mobile Multimedia Broadcasting) standard is proposed by State Administration of Radio Film and Television, is issued in October, 2006 to be industry standard.CMMB adopts the high-power satellite of S-band to augment the technical system that network combines with ground with frequency, One-to-All Broadcast and two-way interaction combine, realize that national world one covers, whole nation roaming, this standard is applicable to 30Mhz～3000Mhz frequency range, via satellite or the broadcast system of multi-media signals such as terrestrial wireless emission TV, broadcasting, data message.
According to first in " GY/T220 Mobile Multimedia Broadcasting ": the broadcast channel frame structure, chnnel coding and modulation specifications, the business datum process forward error correction coding of the transmitter of broadcast system to being broadcasted, interweave and constellation mapping after, with scattered pilot with continuous pilot multiple connection be in the same place, obtain OFDM (OFDM, Orthogonal Frequency Division Multiplex) effective subcarrier, 0-7 number eight scramblers by defining in the agreement again, the effective subcarrier of the OFDM that obtains is carried out scrambling, the effective subcarrier of OFDM after the scrambling is by inverse FFT (IFFT, Inverse Fast FourierTransformation) is mapped as the OFDM symbol, at last, the transmission signal that to be made up of these OFDM symbols is a cycle unit with a frame, is divided into 40 time slots and sends to receiver.Wherein, the scrambler that adopts during each OFDM symbol scrambling in each time slot is identical, and for example time slot 0 is fixing adopts No. 0 scrambler; The receiver of terminal receives the transmission signal, need demodulation OFDM symbol wherein, and the scrambler that is adopted when obtaining scrambling number finishes descrambling, thereby finally obtains the business datum that broadcast system sends, and makes that the transfer of data between terminal and the broadcast system is synchronous fully.
But, the receiver of terminal in the prior art be owing to self can't know scrambler that current time slots adopts number, thereby when this time slot of demodulation OFDM symbol, need at first detect the scrambler number of this time slot, just can finish corresponding descrambling, and the final synchronous business datum that broadcast system sends that receives.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of scrambler detection method and device, to such an extent as to can't determine scrambler number influence that each time slot the adopted problem to the synchronous reception of business datum with the receiver that solves terminal.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of scrambler detection method, described method comprises: according to the OFDM symbol that current time slots receives, the receiver of terminal obtains the effective subcarrier of OFDM; Adopt each scrambler of protocol definition respectively the effective subcarrier of resulting OFDM to be carried out descrambling, and the effective subcarrier of each OFDM behind descrambling, extract continuous pilot subcarrier or scattered pilot subcarrier respectively corresponding to each scrambler; According to each scrambler that extracts the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier, determine the scrambler number of current time slots, finish the detection of scrambler number.
In such scheme, the process of the scrambler of described definite current time slots number is specially: calculate each scrambler the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier; In the power that calculates, search maximum power value corresponding to each scrambler; Obtain the scrambler of the maximum power value correspondence that found, with the scrambler of this scrambler number as the scrambler of current time slots number.
In such scheme, calculate the continuous pilot subcarrier of a scrambler correspondence or the process of scattered pilot sub-carrier power, be specially: to described scrambler corresponding continuous pilot subcarrier of institute or scattered pilot subcarrier carry out the conjugation coherent computing successively, add up, Power arithmetic, obtain the continuous pilot subcarrier of described scrambler correspondence or the power of scattered pilot subcarrier.
In such scheme, calculate the continuous pilot subcarrier of a scrambler correspondence or the process of scattered pilot sub-carrier power, be specially: continuous pilot subcarrier or scattered pilot subcarrier to described scrambler correspondence carry out coherent accumulation, result to coherent accumulation carries out Power arithmetic again, result to Power arithmetic carries out noncoherent accumulation at last, obtain described scrambler the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier.
In such scheme, the described effective subcarrier of each OFDM behind descrambling, extract continuous pilot subcarrier or scattered pilot subcarrier, be specially: the effective subcarrier of each OFDM behind descrambling, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler.
In such scheme, the process of the effective subcarrier of described acquisition OFDM, be specially: the receiver of terminal carries out fast Fourier transformation operation to the OFDM symbol that current time slots receives, and obtains the effective subcarrier of OFDM.
The present invention also provides a kind of scrambler checkout gear, and described device comprises: receiving element, acquiring unit, descrambling unit, extraction unit, determining unit, and wherein: receiving element is used to receive the OFDM symbol of current time slots; Acquiring unit is used for the OFDM symbol that receives according to described receiving element, obtains the effective subcarrier of OFDM; The descrambling unit is used to adopt each scrambler of protocol definition respectively the effective subcarrier of the resulting OFDM of described acquiring unit to be carried out descrambling; Extraction unit is used for the effective subcarrier of each OFDM that obtains from described descrambling unit, extracts continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler respectively; Determining unit is used for the pairing continuous pilot subcarrier of each scrambler that extracts according to described extraction unit or the power of scattered pilot subcarrier, determines the scrambler number of current time slots.
In such scheme, described acquiring unit specifically is used for described receiving element is carried out fast Fourier transformation operation at the OFDM symbol that current time slots receives, and obtains the effective subcarrier of OFDM.
In such scheme, institute's extraction unit, specifically be used for the effective subcarrier of each OFDM that obtains from described descrambling unit, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler.
In such scheme, described determining unit specifically comprises: computing module, search module, scrambler determination module; Wherein, computing module, be used to calculate each scrambler that described extraction unit extracts the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier; Search module, be used for the power that obtains at described computing module, search maximum power value corresponding to each scrambler; The scrambler determination module is used to obtain the described scrambler of searching the maximum power value correspondence that module finds, and the scrambler of this scrambler number is the scrambler number of current time slots.
The effective subcarrier of OFDM that the present invention obtains the OFDM symbol that is received by current time slots, after adopting each scrambler to carry out descrambling respectively, extract continuous pilot subcarrier or scattered pilot subcarrier the effective subcarrier of each OFDM behind descrambling corresponding to different scrambling codes, by each the continuous pilot subcarrier that is extracted or the power of scattered pilot subcarrier, determine the scrambler number of current time slots, finish the detection of current time slots scrambler number, thereby efficiently solve the problem that receiver can't effectively obtain current time slots scrambler number fast, and can guarantee finishing smoothly of signal Synchronization transmission between receiver and the transmitter.
Description of drawings
Fig. 1 is the realization flow schematic diagram of scrambler detection method of the present invention;
Fig. 2 is that the effective subcarrier of OFDM of an interior OFDM symbol of time slot among the CMMB is formed schematic diagram;
Fig. 3 is the composition structural representation of scrambler checkout gear of the present invention;
Fig. 4 is a schematic flow sheet of realizing the scrambler number detection of CMMB standard mobile television terminal by the present invention.
Embodiment
Scrambler detection method of the present invention, to the effective subcarrier of OFDM that obtains by current time slots OFDM symbol, after adopting each scrambler to carry out descrambling respectively, extract continuous pilot subcarrier or scattered pilot subcarrier the effective subcarrier of each OFDM behind descrambling, finish detection scrambler number.
With reference to shown in Figure 1, scrambler detection method of the present invention mainly may further comprise the steps:
Step 101: according to the OFDM symbol that current time slots receives, the receiver of terminal obtains the effective subcarrier of OFDM;
Particularly, can carry out the FFT computing, obtain the effective subcarrier of OFDM by the OFDM symbol that current time slots is received;
Step 102: adopt each scrambler of protocol definition respectively resulting OFDM subcarrier to be carried out descrambling, and the effective subcarrier of each OFDM behind descrambling, extract continuous pilot subcarrier or scattered pilot subcarrier respectively corresponding to each scrambler;
Particularly, owing to defined eight scramblers altogether 0-7 number in the agreement, therefore, in the practical application, can adopt these eight scramblers of stipulating in the agreement respectively the effective subcarrier of resulting OFDM to be carried out descrambling, and behind the descrambling of these eight scrambler correspondences, the effective subcarrier of OFDM, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to these eight scramblers.
Here, the business data flow that the effective subcarrier of OFDM comprises continuous pilot subcarrier, scattered pilot subcarrier and will transmit, wherein, continuous pilot subcarrier and scattered pilot subcarrier are before broadcast system and terminal carrying out service transfer of data, obtain by protocol negotiation, and in broadcast system and terminal, preserve.
Wherein, the scattered pilot subcarrier does not carry any information, is mainly used to auxiliary receiver and carries out channel estimating, coherent detection and demodulation; Carried the transmission indication information of broadcast system on the continuous pilot subcarrier of part.
For example, form schematic diagram with reference to the effective subcarrier of OFDM of OFDM symbol in time slot among the CMMB of Fig. 2, wherein, the longitudinal axis is represented 53 OFDM symbols in the time slot; Transverse axis is represented the effective subcarrier of OFDM of each OFDM symbol correspondence, data three parts that the effective subcarrier of this OFDM includes continuous pilot subcarrier, scattered pilot subcarrier, will transmit; Continuous pilot is filled expression by oblique line, and scattered pilot is filled expression by black, all the other blank data of indicating to transmit of filling.
Step 103: according to each scrambler that is extracted the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier, determine the scrambler number of current time slots, finish the detection of scrambler number.
Particularly, determine the process of the scrambler number of current time slots, can for: at first, calculate each scrambler the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier; Secondly, in the power that calculates, search maximum power value corresponding to each scrambler; At last, obtain the scrambler of the maximum power value correspondence that found, the scrambler of this scrambler number as the scrambler of current time slots number, is finished determining of current time slots scrambler number.
Wherein, for any one scrambler, calculate the process of the power of its corresponding continuous pilot subcarrier or scattered pilot subcarrier, specifically can be: continuous pilot subcarrier or the scattered pilot subcarrier to this scrambler correspondence carries out the conjugation coherent computing successively, adds up, Power arithmetic, obtains the continuous pilot subcarrier of this scrambler correspondence or the power of scattered pilot subcarrier;
Perhaps, all right: continuous pilot subcarrier or scattered pilot subcarrier to this scrambler correspondence carry out coherent accumulation, result to coherent accumulation carries out Power arithmetic again, result to Power arithmetic carries out noncoherent accumulation at last, obtains the continuous pilot subcarrier of this scrambler or the power of scattered pilot subcarrier.
A kind of scrambler checkout gear of the present invention with reference to shown in Figure 3, mainly comprises: receiving element 31, acquiring unit 32, descrambling unit 33, extraction unit 34, determining unit 35, wherein:
Receiving element 31 is used to receive the OFDM symbol of current time slots;
Descrambling unit 33 is used to adopt each scrambler of protocol definition respectively the effective subcarrier of described acquiring unit 32 resulting OFDM to be carried out descrambling;
Determining unit 35, be used for each scrambler of extracting according to described extraction unit 34 the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier, determine the scrambler number of current time slots.
Wherein, described acquiring unit 32 specifically can obtain the effective subcarrier of OFDM by described receiving element 31 is carried out fast Fourier transformation operation at the OFDM symbol that current time slots receives; Described extraction unit 34, specifically can be by the effective subcarrier of each OFDM that obtains from described descrambling unit 33, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler.
Wherein, described determining unit 35 specifically can comprise: computing module 351, search module 352, scrambler determination module 353, wherein:
Wherein, for any one scrambler, described computing module 351 specifically can obtain the continuous pilot subcarrier of this scrambler correspondence or the power of scattered pilot subcarrier by following process:
Described scrambler corresponding continuous pilot subcarrier of institute or the scattered pilot subcarrier that described extraction unit 34 is extracted carries out the conjugation coherent computing successively, adds up, Power arithmetic, obtains the continuous pilot subcarrier of corresponding described scrambler or the power of scattered pilot subcarrier;
Perhaps, described scrambler corresponding continuous pilot subcarrier of institute or scattered pilot subcarrier that described extraction unit 34 is extracted carry out coherent accumulation, result to coherent accumulation carries out Power arithmetic again, result to Power arithmetic carries out noncoherent accumulation at last, obtains the continuous pilot subcarrier of corresponding described scrambler or the power of scattered pilot subcarrier.
Here, the scrambler checkout gear can be arranged in the receiver of terminal, realizes the scrambler number detection to each time slot OFDM symbol.
Specific implementation during the scrambler number that the present invention is applied to CMMB standard mobile television terminal detects below elaborates.
With reference to shown in Figure 4, realize that by the present invention the scrambler of CMMB standard mobile television terminal number detects, idiographic flow is as follows:
Step 401: 53 OFDM symbols that current time slots is received carry out the FFT computing of 4096 length respectively, and extraction obtains 3076 effective subcarrier a of OFDM from the FFT operation result
I, j
Wherein, i is the OFDM notation index, satisfies 0≤i≤52; J is the effective sub-carrier indices of OFDM, satisfies 0≤j≤3075; The OFDM symbol that receives in time slot is 53, and the OFDM symbol that participates in above-mentioned FFT computing here can be chosen part or all of these 53 OFDM symbols, and concrete quantity span can be 2-53.
Step 402: the scrambler m that puts current scrambler is zero;
Step 403: the scrambler sequence s that utilizes current scrambler according to formula (1)
I, j, to the effective subcarrier a of OFDM
I, jCarry out descrambling, obtain the effective subcarrier b of OFDM behind the descrambling
I, j
b
i，j＝a
i，j×conj(s
i，j) (1)
Wherein, conj () grips computing altogether for asking, and i is the OFDM notation index, satisfies 0≤i≤52; J is the effective sub-carrier indices of OFDM, satisfies 0≤j≤3075.
Here, each scrambler is preset with corresponding scrambler sequence, need finish the scrambling and the descrambling of the effective subcarrier of OFDM by the scrambler sequence of each scrambler, and detailed process is a prior art, does not repeat them here.
Step 404: the effective subcarrier b of OFDM behind the descrambling
I, jIn, extract 82 continuous pilot subcarrier c
I, k
Wherein, i is the OFDM notation index, satisfies 0≤i≤52; K satisfies 0≤k≤81 for the continuous pilot sub-carrier indices after extracting.
Here, can come the quantity of definite continuous pilot subcarrier that is extracted according to the practical application needs.Because the effective subcarrier b of OFDM behind the descrambling
I, jIn comprise 82 continuous pilot subcarriers altogether, therefore, the quantitative range of the continuous pilot subcarrier that extracts is 1-82.
Step 405: to the continuous pilot subcarrier c that is extracted
I, kIn before and after the OFDM notation index each continuous pilot subcarrier adjacent, that the continuous pilot sub-carrier indices is identical grip coherent computing altogether according to formula (2), obtain the continuous pilot subcarrier d behind the conjugate operation
I, k
d
i，k＝c
i-1，k×conj(c
i，k) (2)
Wherein, i is the OFDM notation index, satisfies 0≤i≤52; K satisfies 0≤k≤81 for the continuous pilot sub-carrier indices after extracting.
Step 406: according to formula (3) to the continuous pilot subcarrier d behind the conjugate operation
I, kAdd up, obtain current scrambler the accumulation result e of corresponding continuous pilot subcarrier;
Wherein, i is the OFDM notation index, satisfies 0≤i≤52; K satisfies 0≤k≤81 for the continuous pilot sub-carrier indices after extracting.
Step 407: according to formula (4) accumulation result e is carried out Power arithmetic, obtain the power f of the continuous pilot subcarrier of current scrambler m correspondence
m
f
m＝abs(e)·abs(e) (4)
Wherein, m is the scrambler number of current scrambler.
Step 408-409: judge whether current scrambler is last scrambler, judges promptly whether the scrambler m of current scrambler satisfies formula (5),
m＞7 (5)
If not, then next scrambler is changed to current scrambler, i.e. m=m+1, and return step 403; Otherwise, continue step 410.
Step 410: at the power f of the continuous pilot subcarrier of each the scrambler correspondence that obtains through above-mentioned steps 402-409
m, in 0≤m≤7, search maximum performance number f
n, f wherein
nSatisfy formula (6):
f
n＝max(f
m)，(0≤m≤7) (6)
The power f that is then found
nCorresponding scrambler n is the pairing scrambler of current time slots number, so far, finishes the testing process of current time slots scrambler number.
Wherein, each scrambler of the calculating that above-mentioned steps 405-407 realized the process of power of corresponding continuous pilot subcarrier, can also realize by following flow process:
At first: the continuous pilot subcarrier that step 404 is extracted carries out coherent accumulation according to formula (7), obtains coherent accumulation g as a result
k, coherent accumulation is a unit length with OFDM notation index i;
Wherein, in the present embodiment, OFDM notation index i satisfies 0≤i≤52.
Particularly, the span of i is decided by the number of selected OFDM symbol.
Secondly: can be according to formula (8) to resulting coherent accumulation g as a result
kCarry out power calculation, obtain g
kPower h
m
h
k，m＝abs(g)·abs(g) (8)
At last: can be according to formula (9) to each coherent accumulation of obtaining g as a result
kPower h
K, mCarry out noncoherent accumulation, k is a unit length with the continuous pilot sub-carrier indices, obtains the power f of the continuous pilot subcarrier of current scrambler m correspondence
m
Wherein, in the present embodiment, continuous pilot sub-carrier indices k satisfies 0≤k≤81.
Particularly, the span of k is decided by the number of the continuous pilot subcarrier that is extracted.
Need to prove, the foregoing description, can realize the detection of current time slots scrambler number by from the OFDM subcarrier, extracting the scattered pilot subcarrier equally, concrete realization flow is similar to the flow process of the foregoing description, different is, the quantitative range that extracts the scattered pilot subcarrier is 0-384, and those skilled in the art can directly obtain from said process, therefore, do not repeat them here.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a scrambler detection method is characterized in that, described method comprises:
According to the OFDM symbol that current time slots receives, the receiver of terminal obtains the effective subcarrier of OFDM;
Adopt each scrambler of protocol definition respectively the effective subcarrier of resulting OFDM to be carried out descrambling, and the effective subcarrier of each OFDM behind descrambling, extract continuous pilot subcarrier or scattered pilot subcarrier respectively corresponding to each scrambler;
According to each scrambler that extracts the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier, determine the scrambler number of current time slots, finish the detection of scrambler number.
2. scrambler detection method according to claim 1 is characterized in that, the process of the scrambler of described definite current time slots number is specially:
Calculate each scrambler the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier; In the power that calculates, search maximum power value corresponding to each scrambler; Obtain the scrambler of the maximum power value correspondence that found, with the scrambler of this scrambler number as the scrambler of current time slots number.
3. scrambler detection method according to claim 2 is characterized in that, calculates the continuous pilot subcarrier of a scrambler correspondence or the process of scattered pilot sub-carrier power, is specially:
To described scrambler corresponding continuous pilot subcarrier of institute or scattered pilot subcarrier carry out the conjugation coherent computing successively, add up, Power arithmetic, obtain the continuous pilot subcarrier of described scrambler correspondence or the power of scattered pilot subcarrier.
4. scrambler detection method according to claim 2 is characterized in that, calculates the continuous pilot subcarrier of a scrambler correspondence or the process of scattered pilot sub-carrier power, is specially:
Continuous pilot subcarrier or scattered pilot subcarrier to described scrambler correspondence carry out coherent accumulation, result to coherent accumulation carries out Power arithmetic again, result to Power arithmetic carries out noncoherent accumulation at last, obtain described scrambler the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier.
5. according to each described scrambler detection method of claim 1 to 4, it is characterized in that, the described effective subcarrier of each OFDM behind descrambling, extract continuous pilot subcarrier or scattered pilot subcarrier, be specially:
The effective subcarrier of each OFDM behind descrambling, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler.
6. scrambler detection method according to claim 1 is characterized in that, the process of the effective subcarrier of described acquisition OFDM is specially:
The receiver of terminal carries out fast Fourier transformation operation to the OFDM symbol that current time slots receives, and obtains the effective subcarrier of OFDM.
7. a scrambler checkout gear is characterized in that, described device comprises: receiving element, acquiring unit, descrambling unit, extraction unit, determining unit, wherein:
Receiving element is used to receive the OFDM symbol of current time slots;
Acquiring unit is used for the OFDM symbol that receives according to described receiving element, obtains the effective subcarrier of OFDM;
The descrambling unit is used to adopt each scrambler of protocol definition respectively the effective subcarrier of the resulting OFDM of described acquiring unit to be carried out descrambling;
Extraction unit is used for the effective subcarrier of each OFDM that obtains from described descrambling unit, extracts continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler respectively;
Determining unit is used for the pairing continuous pilot subcarrier of each scrambler that extracts according to described extraction unit or the power of scattered pilot subcarrier, determines the scrambler number of current time slots.
8. according to the described scrambler checkout gear of claim 7, it is characterized in that described acquiring unit specifically is used for described receiving element is carried out fast Fourier transformation operation at the OFDM symbol that current time slots receives, obtain the effective subcarrier of OFDM.
9. according to the described scrambler checkout gear of claim 7, it is characterized in that, institute's extraction unit, specifically be used for the effective subcarrier of each OFDM that obtains from described descrambling unit, extract part or all of continuous pilot subcarrier or scattered pilot subcarrier respectively, obtain continuous pilot subcarrier or scattered pilot subcarrier corresponding to each scrambler.
10. according to the described scrambler checkout gear of claim 7, it is characterized in that described determining unit specifically comprises: computing module, search module, scrambler determination module; Wherein,
Computing module, be used to calculate each scrambler that described extraction unit extracts the power of corresponding continuous pilot subcarrier or scattered pilot subcarrier;
Search module, be used for the power that obtains at described computing module, search maximum power value corresponding to each scrambler;
The scrambler determination module is used to obtain the described scrambler of searching the maximum power value correspondence that module finds, and the scrambler of this scrambler number is the scrambler number of current time slots.
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| CN1264228A (en) * | 2000-02-01 | 2000-08-23 | 深圳市中兴通讯股份有限公司 | Automatic frequency control method and device in broadband CDMA system |
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| CN1433171A (en) * | 2002-01-18 | 2003-07-30 | 华为技术有限公司 | Method of obtaining present access subzone main scramble in synchronous windeband CDMA system |
| CN101499843A (en) * | 2008-01-30 | 2009-08-05 | 京信通信系统（中国）有限公司 | Common frequency multi-cell downlink synchronization method applied to WCDMA system |
| CN101601206A (en) * | 2006-10-18 | 2009-12-09 | 韩国电子通信研究院 | Be used for ofdm system based on time-multiplexed small region search method |
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- 2010-02-11 CN CN2010101119880A patent/CN102158447A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1264228A (en) * | 2000-02-01 | 2000-08-23 | 深圳市中兴通讯股份有限公司 | Automatic frequency control method and device in broadband CDMA system |
| CN1349324A (en) * | 2000-09-18 | 2002-05-15 | 株式会社Ntt都科摩 | Method and equipment for district searching used for mobile station of mobile communication system |
| CN1433171A (en) * | 2002-01-18 | 2003-07-30 | 华为技术有限公司 | Method of obtaining present access subzone main scramble in synchronous windeband CDMA system |
| CN101601206A (en) * | 2006-10-18 | 2009-12-09 | 韩国电子通信研究院 | Be used for ofdm system based on time-multiplexed small region search method |
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Application publication date: 20110817 |