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公开(公告)号：AU3517501A
公开(公告)日：2001-10-25
申请号：AU3517501
申请日：2001-04-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , VISWANATH PRAMOD , RANGAN SUNDEEP , LI JUNYI
IPC: H04B1/713 , H04B1/7143 , H04B1/7156 , H04B7/26 , H04J11/00 , H04L5/02 , H04L27/26 , H04J13/02 , H04B7/216 , H04L5/00 , H04J13/06
Abstract: A base station having the strongest downlink signal is identified by utilizing a unique slope of a pilot tone hopping sequence being transmitted by a base station. Specifically, base station identification is realized by determining the slope of the strongest received pilot signal, i.e., the received pilot signal having the maximum energy. In an embodiment of the invention, the pilot tone hopping sequence is based on a Latin Squares sequence. With a Latin Squares based pilot tone hopping sequence, all a mobile user unit needs is to locate the frequency of the pilot tones at one time because the pilot tone locations at subsequent times can be determined from the slope of the Latin Squares pilot tone hopping sequence. The slope and initial frequency shift of the pilot tone hopping sequence with the strongest received power is determined by employing a unique maximum energy detector. In one embodiment, the slope and initial frequency shift of the pilot signal having the strongest received power is determined by finding the slope and initial frequency shift of a predicted set of pilot tone locations having the maximum received energy. In another embodiment, the frequency shift of the pilot signal with the strongest, i.e., maximum, received power is estimated at each of times "t". These frequency shifts are employed in accordance with a prescribed relationship to determine the unknown slope and the initial frequency shift of the pilot signal.
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公开(公告)号：DE60130820D1
公开(公告)日：2007-11-22
申请号：DE60130820
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: An uplink synchronization and access control system is provided, in which mobile stations transmit certain timing and access signals in dedicated intervals in an uplink stream. Access control is illustratively implemented as a two-stage process, in which a given mobile first transmits a generic uplink access signal, in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment, which contains initial timing and power corrections, along with initial channel assignments, on which the mobile can initiate a call set-up process. For re-synchronization, mobiles transmit timing synchronization signals in the dedicated timing and access intervals. The base station measures the arrival time of the signals, and sends back appropriate timing corrections. The invention thereby ensures that orthogonality between mobiles is maintained.
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13.发明专利
公开(公告)号：CA2331225C
公开(公告)日：2005-11-01
申请号：CA2331225
申请日：2001-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： UPPALA SATHYADEV VENKATA , LI JUNYI , LAROIA RAJIV , RANGAN SUNDEEP
Abstract: Improved timing synchronization and access control techniques for use in an orthogonal frequency division multiplexed (OFDM) wireless system or other ty pe of wireless communication system. In accordance with the invention, an uplink synchronization and access control system is provided in which mobile statio ns transmit certain timing and access signals in dedicated intervals in an uplink stream . Access control is illustratively implemented as a two-stage process in which a given mobile first transmits a generic uplink access signal in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment containing initial timing and pow er corrections, along with initial channel assignments on which the mobile can initiate a ca ll set-up process. For re-synchronization, mobiles transmit timing synchronization signals in t he dedicated timing and access intervals. The base station measures the arrival time of t he signals, and sends back appropriate timing corrections. The invention thereby ensures tha t orthogonality between mobiles is maintained.
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公开(公告)号：CA2330776A1
公开(公告)日：2001-08-11
申请号：CA2330776
申请日：2001-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI JUNYI , LAROIA RAJIV , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: Signal construction, detection and estimation techniques for use in uplink timing synchronization and access control in an orthogonal frequency division multiplexed (OFDM) wireless system or other type of wireless communication system. In accordanc e with an illustrative embodiment of the invention, timing and access signals to be transmitted in designated timing and access intervals are constructed from orthogonal multitone signals. The multitone signals may be similar to multitone signals used in OFDM data transmission, except that a cyclic prefix associated with reception of the signals in a ba se station is extended to cover the timing errors of mobile stations not yet synchronized. The invention also provides design techniques which optimize the time resolvability and pe ak- to-average ratio of the multitone signals, an efficient fast Fourier transform (FFT) based technique for maximum likelihood timing estimation, and a robust linear filtering techniqu e for averaging timing estimates from different synchronizations.
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公开(公告)号：AU7229800A
公开(公告)日：2001-06-28
申请号：AU7229800
申请日：2000-12-15
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
IPC: H04J11/00 , H04B1/7136 , H04B1/7143 , H04L5/02 , H04J13/02
Abstract: Tone sequences in a frequency hopping arrangement are generated and assigned by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and assign them on a time slot by time slot basis. In a transmitter, the sequence generator and sequence assignor, in combination with a user tone assignor are employed to generate and assign tone sequences to a user on a time slot by time slot basis. In a receiver, the sequence generator and sequence assignor, in combination with a user tone identifier are employed to generate sequences and to identify incoming tone sequences to a user on a time slot by time slot basis. Specifically, the sequence assignment in a time slot is such that a prescribed plurality of sequences is assigned to a particular user. This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor. The sequence assignor functions in such a manner that the interference and frequency diversity properties for the one or more users are preserved, and this is further facilitated by assigning sequences in such a manner that they maximally overlap prior assigned sequences. In one example of the invention, a Latin square based sequence is generated in accordance with a first prescribed process. In an embodiment of the invention, a Latin cube based sequence is generated in accordance with a second prescribed process. In another embodiment of the invention, a Latin hypercube of prescribed dimension based sequence is generated in accordance with a third prescribed process. In still another embodiment of the invention, the principles of the invention are employed to realize frequency band hopping.
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Patent Agency Ranking
公开(公告)号：BRPI0006806B1
公开(公告)日：2016-06-14
申请号：BR0006806
申请日：2000-12-15
Applicant: FLARION TECHNOLOGIES INC , LUCENT TECHNOLOGIES INC , QUALCOMM INC
Inventor： LI JUNYI , LAROIA RAJIV , UPPALA SATHYADEV VENKATA , RANGAN SUNDEEP
IPC: H04J11/00 , H04B1/713 , H04B1/7136 , H04B1/7143 , H04L5/02
Abstract: aparelho e transceptor para uso em um sistema sem fio de acesso múltiplo de espectro disperso baseado em multiplexagem por divisão de freqüência ortogonal seqüências de tom em um arranjo de variação de freqüência são geradas e atribuídas empregando-se vantajosamente uma combinação de um gerador de seqüência e um atribuidor de seqüência para gerar seqüências e atribuir as mesmas em uma base de intervalo de tempo por intervalo de tempo. em um transmissor, o gerador de seqüência e atribuidor de seqüência, em combinação com um atribuidor de tom de usuário são empregados para gerar e atribuir seqüências de tom a um usuário em uma base de intervalo de tempo por intervalo de tempo. em um receptor, o gerador de seqüência e atribuidor de seqüência, em combinação com um identificador de tom de usuário são empregados para gerar seqüências e identificar seqüências de tom de entrada a um usuário em uma base de intervalo de tempo por intervalo de tempo. especificamente, a atribuição de seqüência em um intervalo de tempo é tal que uma pluralidade determinada de seqüências é atribuída a um usuário específico. esta divisão das tarefas facilita o uso de um gerador de seqüência que gera seqüências com as propriedades desejáveis de interferência e diversidade de freqüência e, que, deixa a tarefa de atribuir adequadamente estas seqüências entre um ou mais usuários ao atribuidor de seqüência. o atribuidor de seqüência funciona de tal modo que as propriedades de diversidade de freqüência e interferência para um ou mais usuários são preservadas, e isto é adicionalmente facilitado pela atribuição de seqüências de tal modo que as mesmas sobreponham ao máximo seqüências atribuídas anteriores. em uma modalidade da invenção, uma seqüência baseada em quadrado latino é gerada de acordo com um primeiro processo determinado. em uma segunda modalidade da invenção, uma seqüência baseada em cubo latino é gerada de acordo com um segundo processo determinado. em uma terceira modalidade da invenção, um hipercubo latino de seqüência baseada em dimensão determinada é gerada de acordo com um terceiro processo determinado. ainda em outra modalidade da invenção, os princípios da invenção são empregados para realizar a variação de banda de freqüência.
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公开(公告)号：DE60130820T2
公开(公告)日：2008-08-07
申请号：DE60130820
申请日：2001-01-29
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: An uplink synchronization and access control system is provided, in which mobile stations transmit certain timing and access signals in dedicated intervals in an uplink stream. Access control is illustratively implemented as a two-stage process, in which a given mobile first transmits a generic uplink access signal, in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment, which contains initial timing and power corrections, along with initial channel assignments, on which the mobile can initiate a call set-up process. For re-synchronization, mobiles transmit timing synchronization signals in the dedicated timing and access intervals. The base station measures the arrival time of the signals, and sends back appropriate timing corrections. The invention thereby ensures that orthogonality between mobiles is maintained.
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18.发明专利
公开(公告)号：AU779054B2
公开(公告)日：2005-01-06
申请号：AU1827201
申请日：2001-02-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , VENKATA SATHYADEV
Abstract: An uplink synchronization and access control system is provided, in which mobile stations transmit certain timing and access signals in dedicated intervals in an uplink stream. Access control is illustratively implemented as a two-stage process, in which a given mobile first transmits a generic uplink access signal, in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment, which contains initial timing and power corrections, along with initial channel assignments, on which the mobile can initiate a call set-up process. For re-synchronization, mobiles transmit timing synchronization signals in the dedicated timing and access intervals. The base station measures the arrival time of the signals, and sends back appropriate timing corrections. The invention thereby ensures that orthogonality between mobiles is maintained.
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19.发明专利
公开(公告)号：CA2331225A1
公开(公告)日：2001-08-11
申请号：CA2331225
申请日：2001-01-12
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA
Abstract: Improved timing synchronization and access control techniques for use in an orthogonal frequency division multiplexed (OFDM) wireless system or other ty pe of wireless communication system. In accordance with the invention, an uplink synchronization and access control system is provided in which mobile statio ns transmit certain timing and access signals in dedicated intervals in an uplink stream . Access control is illustratively implemented as a two-stage process in which a given mobile first transmits a generic uplink access signal in one of the intervals. If this access is accepted, the base station transmits an access acknowledgment containing initial timing and pow er corrections, along with initial channel assignments on which the mobile can initiate a ca ll set-up process. For re-synchronization, mobiles transmit timing synchronization signals in t he dedicated timing and access intervals. The base station measures the arrival time of t he signals, and sends back appropriate timing corrections. The invention thereby ensures tha t orthogonality between mobiles is maintained.
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公开(公告)号：CA2327980A1
公开(公告)日：2001-06-23
申请号：CA2327980
申请日：2000-12-08
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , UPPALA SATHYADEV VENKATA , RANGAN SUNDEEP
IPC: H04J11/00 , H04B1/7136 , H04B1/7143 , H04L5/02
Abstract: Tone sequences in a frequency hopping arrangement are generated and assign ed by advantageously employing a combination of a sequence generator and a sequence assignor to generate sequences and assign them on a time slot by time slot basis. In a transmitter, the sequence generator and sequence assignor, in combination wi th a user tone assignor are employed to generate and assign tone sequences to a user o n a time slot by time slot basis. In a receiver, the sequence generator and sequence assignor, in combination with a user tone identifier are employed to generate sequences a nd to identify incoming tone sequences to a user on a time slot by time slot basis . Specifically, the sequence assignment in a time slot is such that a prescrib ed plurality of sequences is assigned to a particular user. This partitioning of the tasks facilitates the use of a sequence generator that generates sequences with the desirable properties of interference and frequency diversity and, which, leaves the task of properly assigning these sequences among one or more users to the sequence assignor. The sequen ce assignor functions in such a manner that the interference and frequency diversity properties for the one or more users are preserved, and this is further facilitated by assigning sequences in such a manner that they maximally overlap prior assigned sequences. In one embodiment of the invention, a Latin square based sequence is generated in accordance with a first prescribed process. In a second embodiment of the invention, a Latin cube based sequence is generated in accordance with a second prescribed process. In a third embodiment of the invention, a Latin hypercub e of prescribed dimension based sequence is generated in accordance with a third prescribed process. In still another embodiment of the invention, the principles of the invention are employed to realize frequency band hopping.
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