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公开(公告)号：BR0100361A
公开(公告)日：2001-10-02
申请号：BR0100361
申请日：2001-02-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA , LI JUNYI
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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公开(公告)号：BR0100359A
公开(公告)日：2001-10-02
申请号：BR0100359
申请日：2001-02-05
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , RANGAN SUNDEEP , UPPALA SATHYADEV VENKATA , LI JUNYI
Abstract: 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, which is associated with reception of the signals in a base station, is extended to cover the timing errors of mobile stations not yet synchronized. Design techniques which optimize the time resolvability and peak-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 technique for averaging timing estimates from different synchronizations, are also provided.
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公开(公告)号：BR0006806A
公开(公告)日：2001-07-24
申请号：BR0006806
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 , H04Q7/22
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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公开(公告)号：DE69703233T2
公开(公告)日：2001-02-22
申请号：DE69703233
申请日：1997-12-02
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , YEO BOON-LOCK
Abstract: Coding systems that provide a perceptually improved approximation of the short-term characteristics of speech signals compared to typical coding techniques such as linear predictive analysis while maintaining enhanced coding efficiency. The invention advantageously employs a non-linear transformation and/or a spectral warping process to enhance particular short-term spectral characteristic information for respective voiced intervals of a speech signal. The non-linear transformed and/or warped spectral characteristic information is then coded, such as by linear predictive analysis to produce a corresponding coded speech signal. The use of the non-linear transformation and/or spectral warping operation of the particular spectral information advantageously causes more coding resources to be used for those spectral components that contribute greater to the perceptible quality of the corresponding synthesized speech. It is possible to employ this coding technique in a variety of speech coding techniques including, for example, vocoder and analysis-by-synthesis coding systems.
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公开(公告)号：BR0000988A
公开(公告)日：2000-10-17
申请号：BR0000988
申请日：2000-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , VANDERVEEN MICHAELA C
Abstract: An orthogonal frequency division multiplexing (OFDM) based spread spectrum multiple access system using offsetting between cells, and in particular, the use of tone offsetting and time offsetting, is disclosed. More specifically, frequencies that define the tone set of one cell is offset from the frequencies that define the tone set of at least one adjacent cell. In other words, if a first base station is using tones F1, F2, ..., FN within a frequency band, then a second base station adjacent to the first base station uses tones F1+ DELTA f, F2+ DELTA f ..., FN+ DELTA f within the same frequency band. Furthermore, the symbol timing of the base-station of one cell may be offset from the symbol timing of the base-station of an adjacent cell. Thus, if a first base station starts successive symbols at times T1, T2, and T3, then a second base station adjacent to the first base station starts its respective corresponding successive symbols at times T1+ DELTA t, T2+ DELTA t, and T3+ DELTA t. For example, in a cellular system with hexagonally shaped cells, the tone sets of two adjacent cells are offset by 1/3 of the spacing between adjacent tones, and the symbol timings of two adjacent cells are offset by 1/3 of a symbol period. Advantageously, the intercell interference is more uniformly distributed among users in a cell.
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Patent Agency Ranking
公开(公告)号：AU1956600A
公开(公告)日：2000-09-14
申请号：AU1956600
申请日：2000-03-01
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , LI JUNYI , VANDERVEEN MICHAELA C
Abstract: An orthogonal frequency division multiplexing (OFDM) based spread spectrum multiple access system using offsetting between cells, and in particular, the use of tone offsetting and time offsetting, is disclosed. More specifically, frequencies that define the tone set of one cell is offset from the frequencies that define the tone set of at least one adjacent cell. In other words, if a first base station is using tones F1, F2, ..., FN within a frequency band, then a second base station adjacent to the first base station uses tones F1+ DELTA f, F2+ DELTA f ..., FN+ DELTA f within the same frequency band. Furthermore, the symbol timing of the base-station of one cell may be offset from the symbol timing of the base-station of an adjacent cell. Thus, if a first base station starts successive symbols at times T1, T2, and T3, then a second base station adjacent to the first base station starts its respective corresponding successive symbols at times T1+ DELTA t, T2+ DELTA t, and T3+ DELTA t. For example, in a cellular system with hexagonally shaped cells, the tone sets of two adjacent cells are offset by 1/3 of the spacing between adjacent tones, and the symbol timings of two adjacent cells are offset by 1/3 of a symbol period. Advantageously, the intercell interference is more uniformly distributed among users in a cell.
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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：BRPI0104819B1
公开(公告)日：2015-12-15
申请号：BR0104819
申请日：2001-10-25
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LI JUNYI , LAROIA RAJIV , UPPALA SATHYADEV VENKATA
Abstract: "aparelho e método para uso na multidifusão de dados de tráfego em sistemas de comunicação sem fio de acesso múltiplo". num sistema de comunicações sem fio, as mensagens de multidifusão são transportadas para grupos de terminais sem fio empregando-se um canal de controle comum para transmitir uma mensagem de radiochamada de multidifusão, indicando que os dados de tráfego de multidifusão deverão ser transmitidos para um grupo específico de terminais sem fio. numa modalidade da invenção, a transmissão essencial transmitida no canal de controle comum é o identificador do grupo de terminais sem fio destinado a receber os dados de tráfego de multidifusão e a localização de um canal de tráfego no qual o tráfego de multidifusão deverá ser transportado num recurso de canal que possa incluir uma representação de largura de faixa e de intervalo de tempo. de acordo com um aspecto da invenção, o canal de controle comum está associado a um canal de tráfego de uma maneira fixa prescrita. além disso, o canal de tráfego usado para a finalidade de multidifusão pode ser o mesmo canal de tráfego usado para a transmissão normal ponto-a-ponto de dados de tráfego.
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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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40.发明专利
公开(公告)号：ES2242712T3
公开(公告)日：2005-11-16
申请号：ES01308987
申请日：2001-10-23
Applicant: LUCENT TECHNOLOGIES INC
Inventor： LAROIA RAJIV , JUNYI LI , UPPALA SATHYADEV VENKATA
Abstract: Aparato para una estación base (101) de un sistema de comunicaciones inalámbricas de acceso múltiple que incluye al menos una estación base (101) y una pluralidad de terminales inalámbricos (103) para transmitir datos de tráfico multidifusión por un canal de recurso definido por su ancho de banda y su intervalo de tiempo, incluyendo dicho canal de recurso un canal (202, 302, o 502) de tráfico y un canal (201, 301, 501) de asignación, estando dicho canal (202, 302, 502)de tráfico compuesto por una pluralidad de segmentos (402, 403, 504-1, 504-2, ...) de tráfico, estando cada uno de dichos segmentos de tráfico seleccionado a partir de un primer conjunto de formas de onda de señal predeterminadas en un intervalo de tiempo predeterminado (Figuras 4 y 5), y estando dicho canal (201, 301, 501) de asignación compuesto por una pluralidad de segmentos (401, 503-1, 503-2, ...) de asignación, estando cada uno de dichos segmentos de asignación seleccionado a partir de un segundo conjunto de formas de onda de señal predeterminadas en un intervalo de tiempo predeterminado (Figuras 4 y 5), y medios transmisores (105) adaptados para transmitir datos multidifusión o datos punto a punto.
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