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公开(公告)号：CA2674428A1
公开(公告)日：2008-07-17
申请号：CA2674428
申请日：2008-01-10
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , LUO TAO , KIM BYOUNG-HOON
IPC: H04L27/26
Abstract: Systems and methodologies are described that facilitate searches for a ce ll in a wireless communication environment. A mobile device can employ a sea rcher that can detect timing information respectively associated with PSCs a nd cells to determine the cell with the highest correlation. The searcher ca n detect SSCs, which can include detecting associated phase information, to determine the SSC with the highest correlation, CP length, and/or other info rmation to facilitate identifying a desired cell having the strongest signal to establish communication between the mobile device and the desired cell. PSCs respectively associated with cells can have different positions in the symbol sequences, and SSCs can respectively be phase shifted at different an gles to facilitate detection and identification of a cell(s), where a PSC ca n be utilized as a phase reference by the associated SSC.
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公开(公告)号：AR060166A1
公开(公告)日：2008-05-28
申请号：ARP070101280
申请日：2007-03-27
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON , MALLADI DURGA PRASAD , DAMNJANOVIC JELENA
IPC: H04B7/00
Abstract: Técnicas para enviar eficientemente informacion sobre el estado del canal mediante la utilizacion de la codificacion diferencial. La codificacion diferencial puede ser llevada a cabo a través de espacio, a través de frecuencia, a través de espacio y frecuencia, a través de espacio, frecuencia y tiempo, o través de alguna otra combinacion de dimensiones. En un diseno, es posible determinar la informacion de estado espacial para multiples canales espaciales sobre multiples subbandas. Los canales espaciales pueden corresponder con diferentes antenas, diferentes vectores de precodificacion etc. Pueden obtenerse los valores de indicador de la calidad del canal (CQI) para los multiples canales espaciales sobre las multiples subbandas. Los valores de CQI pueden codificarse diferencialmente a través de los multiples canales espaciales y las multiples subbandas, para obtener informacion diferencial de CQI. En otro diseno, pueden obtenerse los valores de CQI para multiples canales espaciales sobre las multiples subbandas en multiples intervalos de tiempo, y se los puede codificar espacialmente a través de espacio, frecuencia y tiempo. La informacion diferencial de CQI y la informacion sobre el estado espacial pueden enviarse como retroalimentacion.
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公开(公告)号：AU2007316403A1
公开(公告)日：2008-05-15
申请号：AU2007316403
申请日：2007-11-06
Applicant: QUALCOMM INC
Inventor： YOO TAESANG , MALLADI DURGA PRASAD , KIM BYOUNG-HOON
Abstract: Techniques for supporting MIMO transmission with layer permutation are described. In one aspect, a base channel quality indicator (CQI) and a delta CQI for a multiple-input multiple-output (MIMO) transmission comprising multiple codewords are determined; and the base CQI and the delta CQI are sent as feedback information for the MIMO transmission.
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114.发明专利
公开(公告)号：CA2787754A1
公开(公告)日：2008-04-10
申请号：CA2787754
申请日：2007-10-01
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , KIM BYOUNG-HOON , LUO TAO
Abstract: Techniques for facilitating cell search by user equipments (UEs) in a wireless communication system are described. In an aspect, a primary synchronization code (PSC) sequence may be generated based on a Frank sequence and a constant amplitude sequence that is repeated multiple times. In another aspect, a set of PSC sequences may be generated based on complementary sequences having good aperiodic correlation properties and efficient implementations. In one design, PSC sequences A+B and B+A may be formed based on Golay complementary sequences A and B, there "+" denotes concatenation. In yet another aspect, a set of secondary synchronization code (SSC) sequences may be generated based on a set of base sequences and different modulation symbols of a modulation scheme. Each base sequence may be modulated by each of M possible modulation symbols for the modulation scheme to obtain M different SSC sequences.
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公开(公告)号：CA2663689A1
公开(公告)日：2008-04-10
申请号：CA2663689
申请日：2007-10-02
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , KIM BYOUNG-HOON
Abstract: Techniques for transmitting acknowledgement (ACK) information in a wirele ss communication system are described. The system supports data transmission to multiple user equipments (UEs) on the same downlink resources with spati al division multiple access (SDMA). A base station sends a data transmission with multiple (M) layers to M UEs. The downlink resources used for the data transmission are associated with ACK resources used to send ACK information for the data transmission. The ACK resources may be partitioned into M port ions, e.g., based on frequency division multiplexing (FDM). Each of the M la yers is associated with a respective portion of the ACK resources. A recipie nt UE for each layer sends ACK for that layer on the associated portion of t he ACK resources. For each ACK resource portion, one or more pilot symbols m ay be sent on one or more resource elements, and ACK symbols may be sent on remaining resource elements.
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Patent Agency Ranking
公开(公告)号：CA2653694A1
公开(公告)日：2008-01-03
申请号：CA2653694
申请日：2007-06-29
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA , XU HAO , KIM BYOUNG-HOON
Abstract: Systems and methodologies are described that facilitate switching between various combinations of MIMO, SIMO, SISO and OFDM, LFDM and IFDM. According to various aspects, a method for a wireless communication network is provid ed that includes: receiving a first set of data information, wherein the fir st set of information comprising a first value, determining if the first val ue is above a threshold and transmitting an indication to switch to using a first transmission technique if determined that the first value is above the threshold.
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公开(公告)号：MX2007011094A
公开(公告)日：2007-11-22
申请号：MX2007011094
申请日：2006-03-13
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON
Abstract: Sistemas y metodos para mejorar el desempeno de un sistema de comunicacion inalambrica MIMO reduciendo la cantidad de recursos de enlace ascendente que se necesitan para proveer la retroalimentacion del rendimiento de canal para el ajuste de velocidades de datos en los canales MIMO de enlace ascendente; en una modalidad, un metodo comprende codificar cada una de un conjunto de corrientes de datos de acuerdo con velocidades de datos correspondientes, permutar las corrientes de datos en un conjunto de canales MIMO de acuerdo con una permutacion completa de combinaciones, transmitir las corrientes de datos permutadas, recibir las corrientes de datos permutadas, decodificar y determinar una SNR para cada una de las corrientes de datos, calcular una metrica SNR condensada para el conjunto de corrientes de datos, proveer la metrica condensada como retroalimentacion, determinar un conjunto de metricas SNR individuales para las corrientes de datos con base en la metrica SNR condensada, y ajustar las velocidades de datos a las que las corrientes de datos son codificadas con base en metricas SNR individuales.
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公开(公告)号：CA2644418A1
公开(公告)日：2007-10-04
申请号：CA2644418
申请日：2007-03-27
Applicant: QUALCOMM INC
Inventor： MALLADI DURGA PRASAD , ZHANG XINPING , KIM BYOUNG-HOON
Abstract: A method for controlling power in a wireless network is provided. The method includes determining a relative power parameter at a wireless device such as a mobile wireless terminal and receiving a load parameter at the wireless device, where the load parameter is associated with at least one other wireless cell. The method includes adjusting transmit power of the wireless device in view of the relative power parameter and the load parameter. In another embodiment, the transmit power can be controlled in view of an absolute power spectral density parameter.
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公开(公告)号：CA2823573A1
公开(公告)日：2007-09-27
申请号：CA2823573
申请日：2007-03-19
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON , MALLADI DURGA PRADAD
Abstract: Techniques for supporting MIMO transmission are described. User equipments (UEs) are classified into a first group of UEs to be scheduled individually and a second group of UEs that can be scheduled together. The classification may be based upon the number of transmit and receive antennas, sector loading, data requirements, long-term channel statistics, the number of UEs, etc. Channel quality indicator (CQI) information received from the UEs is interpreted in different manners depending on the groups to which the UEs belong. A single UE may be selected at a time from the first group or multiple UEs may be selected at a time from the second group for MIMO transmission. A MIMO transmission may be sent to a. single UE in the first group or multiple UEs in the second group at rates selected based upon the CQI information.
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公开(公告)号：CA2578222A1
公开(公告)日：2006-03-09
申请号：CA2578222
申请日：2005-08-26
Applicant: QUALCOMM INC
Inventor： KIM BYOUNG-HOON
Abstract: In one embodiment, a multi-input/multi-output system ( 100 ) includes a receiver ( 104 ), processor, coded bit scrambler ( 114 ), coded bit descrambler ( 130 ), and transmitter ( 102 ). The receiver ( 104 ) generates demodulated symbol streams corresponding to a received signal. The processor generates coded bit sequences from source bit streams when operating in a transmit mode and bit log-likelihood ratio sequences from the information bit streams when operating in a receive mode. The coded bit scrambler ( 114 ) scrambles the coded bit sequences to generate scrambled bit streams when in the transmit mode. The coded bit descrambler ( 130 ) descrambles the log-likelihood ratio sequences by a real-valued descrambling sequence when operating in the receive mode, and also removes the effect of a scrambling sequence. The transmitter ( 102 ) generates a transmit signal corresponding to the scrambled bit streams.
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