公开(公告)号：BRPI0811485A2

公开(公告)日：2014-11-04

申请号：BRPI0811485

申请日：2008-05-02

Applicant: QUALCOMM INC

Inventor： GAAL PETER ,  KIM BYOUNG-HOON ,  LIU KE ,  LUO TAO

IPC: H04L27/26

Abstract: Systems and methods are provided to generate a set of synchronization channel sequences that optimize time and frequency acquisition. A set of root indices of Zadoff-Chu sequences in a first domain (e.g., time domain) that optimize a performance metric or merit factor are identified. An optimal index is determined that also optimizes a performance metric in a reciprocal domain (e.g., frequency domain). Optimal indices satisfy a centro-symmetric relationship with respect to a half-value of sequence length: When 1 is an optimal index, N−1 is also an optimal root index. For sequences of length Q2=N, a base sequence generated with an optimal sequence can be utilized to generate at least two disparate optimal sequences through sign-flip, conjugation, and periodic modulation operations.

公开(公告)号：CA2676054C

公开(公告)日：2014-07-08

申请号：CA2676054

申请日：2008-02-08

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON ,  MALLADI DURGA PRASAD ,  DOAN DUNG N

IPC: H04W28/18

Abstract: Systems, methodologies, and devices are described that can facilitate bandwidth efficient non-coherent signaling for uplink control channel transmissions. A communication device (e.g., a mobile device, base station) can be configured to utilize or generate a set of complex orthogonal codewords to facilitate transmission of control channel information using non-coherent signaling in a bandwidth efficient manner. A complex orthogonal codeword set can comprise a first subset of codewords where such codewords have a desirable cross-correlation property and another subset(s) of codewords that can include expurgated codewords, where the expurgated codewords can include discarded codewords and/or codeword pairs that produce a worst-case cross-correlation property. The codeword set and subsets are determined based at least in part on a predefined codeword criterion. A portion of the discarded codewords can be used for other purposes, such as erasure decoding, interference-level estimation, and/or multi-mode control channel operation.

公开(公告)号：CA2655865C

公开(公告)日：2014-05-20

申请号：CA2655865

申请日：2007-07-10

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON

IPC: H04B7/26

Abstract: Facilitating frequency hopping for single carrier, frequency division multiple access (SC-FDMA) transmission is described herein. By way of example, user data transmitted within a transmission allocation unit can be frequency shifted with respect to time based slots of the allocation unit. As a result, frequency hopping can be accomplished while preserving single carrier constraints and a low peak to average power ratio (PAPR). Furthermore, various frequency shifted mechanisms are disclosed to accomplish preservation of single carrier restraints. For example, a scheduler can select between cyclic frequency shifting, transposed frequency shifting, and multiplexing of frequency selective scheduled and frequency hopped data based on an audit of scheduled data for the transmission allocation unit. As a result, the reduction in interference achieved through frequency hopping can be combined with the low PAPR for various data allocation configurations.

公开(公告)号：CA2667161C

公开(公告)日：2013-10-22

申请号：CA2667161

申请日：2007-11-06

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON ,  YOO TAESANG

IPC: H04B7/06 ,  H04B7/04 ,  H04L1/00 ,  H04L1/06

Abstract: Techniques for supporting MIMO transmission with layer permutation are described. In one aspect, multiple codewords may be generated for transmission from multiple antennas (e.g., virtual antennas), with the number of codewords being less than the number of antennas. Each codeword may be mapped across the multiple antennas. Two codewords may be generated. For rank 3, the first codeword may be mapped to one layer (or one antenna on each subcarrier), and the second codeword may be mapped to two layers (or two antennas on each subcarrier). For rank 4, each codeword may be mapped to two layers. In another aspect, a base CQI indicative of an average signal quality may be determined. A delta CQI indicative of improvement over the average signal quality may also be determined. In yet another aspect, selection may be performed with different penalty factors for different ranks or number of codewords.

公开(公告)号：BRPI0716730A2

公开(公告)日：2013-09-03

申请号：BRPI0716730

申请日：2007-09-13

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  MONTOJO JUAN ,  LI JUNYI ,  KIM BYOUNG-HOON

IPC: H04L27/26 ,  H04B1/713 ,  H04W48/12 ,  H04W48/16

公开(公告)号：CA2674428C

公开(公告)日：2013-07-30

申请号：CA2674428

申请日：2008-01-10

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON ,  LUO TAO

IPC: H04W48/16 ,  H04W56/00

Abstract: Systems and methodologies are described that facilitate searches for a cell in a wireless communication environment. A mobile device can employ a searcher that can detect timing information respectively associated with PSCs and cells to determine the cell with the highest correlation. The searcher can detect SSCs, which can include detecting associated phase information, to determine the SSC with the highest correlation, CP length, and/or other information 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 angles to facilitate detection and identification of a cell(s), where a PSC can be utilized as a phase reference by the associated SSC.

公开(公告)号：CA2665218C

公开(公告)日：2013-07-16

申请号：CA2665218

申请日：2007-10-01

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON ,  LUO TAO

IPC: H04W56/00 ,  H04B1/707 ,  H04J13/00 ,  H04J13/10

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.

公开(公告)号：CA2620067C

公开(公告)日：2012-08-21

申请号：CA2620067

申请日：2006-08-22

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON ,  KADOUS TAMER

IPC: H04B7/06

Abstract: Techniques for transmitting data from virtual antennas instead of physical antennas are described. Each virtual antenna may be mapped to some or all physical antennas by a different mapping. The performance of different sets of at least one virtual antenna is evaluated based on one or more metrics such as signal quality, throughput, overall rate, and so on. The virtual antenna set with the best performance is selected for use. If the virtual antenna selection is performed by the receiver, then channel state information for the selected virtual antenna set may be sent to the transmitter. The channel state information may convey the selected virtual antenna(s), the signal quality or rate(s) for the selected virtual antenna(s), one or more precoding matrices used to form the selected virtual antenna(s), and so on. The transmitter and/or receiver use the selected virtual antenna(s) for data transmission.

公开(公告)号：NZ573586A

公开(公告)日：2011-10-28

申请号：NZ57358607

申请日：2007-07-10

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON

IPC: H04B7/26 ,  H04B1/713 ,  H04L27/26

Abstract: Methods and an apparatus for performs frequency hopping in a single carrier frequency division multiple access (SC-FDMA) transmission are disclosed. The apparatus comprises means for receiving information related to a transmission allocation unit that spans at least two time based slots comprising first and second slots and a plurality of frequency sub-divisions comprising first and second frequency sub-divisions; means for determining the second frequency sub-division in the second slot based on the first frequency sub-division in the first slot and further in accordance with mirror transposition frequency hopping or cyclic shift frequency hopping, or both; and means for sending data in the first frequency sub-division of the first slot and in the second frequency sub-division of the second slot. Further disclosed is an apparatus that receives data via a single carrier frequency division multiple access (SC-FDMA) uplink channel utilizing frequency hopping, comprising means for determining a transmission allocation unit that spans at least two time based slots comprising first and second slots and a plurality of frequency sub-divisions comprising first and second frequency sub-divisions and means for receiving data sent in the first frequency sub-division of the first slot and in the second frequency sub-division of the second slot. The second frequency subdivision in the second slot is determined based on the first frequency sub-division in the first slot and further in accordance with mirror transposition frequency hopping, or cyclic shift frequency hopping, or both.

公开(公告)号：UA96393C2

公开(公告)日：2011-10-25

申请号：UAA201012661

申请日：2009-03-26

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON ,  MONTOJO JUAN ,  GAAL PETER

IPC: H04J13/00

Abstract: Представленспособбеспроводнойсвязи. Способвключаетв себяиспользованиепроцессора, которыйвыполняетинструкции, доступныедлявыполненияс помощьюкомпьютера, сохраненныев сохраняющейсреде, доступнойдлясчитыванияс помощьюкомпьютера, чтобыосуществлятьразныедействия. Способтакжевключаетв себягенерациюциклическихсдвиговдлягенераторапоследовательностис помощьюмаскировкивыходныхзначенийрегистрасдвигас помощьюодногоилиболеевекторов. Способвключаетв себяпродвижениегенераторапоследовательностив будущеесостояниечастичнонаосновевыходныхзначенийи векторов.