公开(公告)号：CA2820472A1

公开(公告)日：2008-03-13

申请号：CA2820472

申请日：2007-09-04

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON

IPC: H04W24/00 ,  H04B7/02

Abstract: Systems and methodologies are described that facilitate reducing feedback required to be transmitted on a reverse link channel in response to a forward link data transmission for multiple-input multiple-output (MIMO) wireless communication systems. In a per group rate control MIMO system, a codeword can be linked to more than one layer. Codewords are mixed among antennas in the MIMO systems based upon a symmetric permutation of antennas groups. Further, codewords are transmitted in permuted form so that receivers can reduce feedback to a base channel quality indicator (CQI) and a differential CQI. Additionally, spatial diversity is increased for each codeword improving the robustness of the system against inaccurate CQI reports.

公开(公告)号：CA2660759A1

公开(公告)日：2008-03-13

申请号：CA2660759

申请日：2007-09-04

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON

IPC: H04B7/06

Abstract: Systems and methodologies are described that facilitate reducing feedback required to be transmitted on a reverse link channel in response to a forwa rd link data transmission for multiple-input multiple-output (MIMO) wireless communication systems. In a per group rate control MIMO system, a codeword can be linked to more than one layer. Codewords are mixed among antennas in the MIMO systems based upon a symmetric permutation of antennas groups. Furt her, codewords are transmitted in permuted form so that receivers can reduce feedback to a base channel quality indicator (CQI) and a differential CQI. Additionally, spatial diversity is increased for each codeword improving the robustness of the system against inaccurate CQI reports.

公开(公告)号：CA2659466A1

公开(公告)日：2008-02-28

申请号：CA2659466

申请日：2007-08-23

Applicant: QUALCOMM INC

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

IPC: H04L27/26

Abstract: Systems and methods allow cell acquisition in a wireless communication sy stem in frequency division multiple access mode of operation. Code sequences transmitted over primary synchronization channel (P-SCH) enable detection o f symbol boundary, cyclic prefix duration, and indication of broadcast chann el bandwidth. Sequences transmitted over secondary synchronization channel ( S-SCH) afford radio frame boundary detection, cell identification, and broad cast channel bandwidth indication. Cell identification can be conveyed joint ly between P-SCH and S-SCH codes. Broadcast channel sequences convey cyclic prefix timing, system bandwidth, and other system information. Relay of cell acquisition information, as well as multiple-cell acquisition when wireless system operates with frequency reuse are described.

公开(公告)号：AU2007286589A1

公开(公告)日：2008-02-28

申请号：AU2007286589

申请日：2007-08-23

Applicant: QUALCOMM INC

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

IPC: H04L27/26

Abstract: An apparatus that operates in a wireless communication environment with orthogonal frequency division multiple access (OFDMA) is provided. The apparatus includes multiple detection components that acquire simultaneously multiple cell information in multiple subcarrier intervals, a processor configured to process the multiple cell information, and a memory coupled to the processor for storing data.

公开(公告)号：CA2655865A1

公开(公告)日：2008-01-17

申请号：CA2655865

申请日：2007-07-10

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON ,  MALLADI DURGA PRASAD

IPC: H04B7/26

Abstract: Facilitating frequency hopping for single carrier, frequency division mul tiple 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 resul t, frequency hopping can be accomplished while preserving single carrier con straints and a low peak to average power ratio (PAPR). Furthermore, various frequency shifted mechanisms are disclosed to accomplish preservation of sin gle carrier restraints. For example, a scheduler can select between cyclic f requency shifting, transposed frequency shifting, and multiplexing of freque ncy selective scheduled and frequency hopped data based on an audit of sched uled data for the transmission allocation unit. As a result, the reduction i n interference achieved through frequency hopping can be combined with the l ow PAPR for various data allocation configurations.

公开(公告)号：AU2007264972A1

公开(公告)日：2008-01-03

申请号：AU2007264972

申请日：2007-06-29

Applicant: QUALCOMM INC

Inventor： XU HAO ,  MALLADI DURGA ,  KIM BYOUNG-HOON

IPC: H04L1/00 ,  H04L27/26

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 provided that includes: receiving a first set of data information, wherein the first set of information comprising a first value, determining if the first value 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.

公开(公告)号：CA2646504A1

公开(公告)日：2007-10-04

申请号：CA2646504

申请日：2007-03-26

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON ,  MALLADI DURGA PRASAD ,  DAMNJANOVIC JELENA

IPC: H04L1/00 ,  H04B7/06 ,  H04L27/26

Abstract: Techniques for efficiently sending channel state information using differential encoding are described. Differential encoding may be performed across space, across frequency, across space and frequency, across space, frequency and time, or across some other combination of dimensions. In one design, spatial state information may be determined for multiple spatial channels on multiple subbands. The spatial channels may correspond to different antennas, different precoding vectors, etc. Channel quality indicator (CQI) values may be obtained for the multiple spatial channels on the multiple subbands. The CQI values may be differentially encoded across the multiple spatial channels and the multiple subbands to obtain differential CQI information. In another design, CQI values may be obtained for multiple spatial channels on the multiple subbands in multiple time intervals and may be differentially encoded across space, frequency and time. The differential CQI information and the spatial state information may be sent as feedback.

公开(公告)号：AU2007226918A1

公开(公告)日：2007-09-27

申请号：AU2007226918

申请日：2007-03-20

Applicant: QUALCOMM INC

Inventor： MALLADI DURGA PRASAD ,  KIM BYOUNG-HOON ,  XU HAO

IPC: H04L1/00

Abstract: Various methods and systems for determining reverse-link data rates in a multi-user communication system are disclosed. For example, an apparatus for controlling a data rate of at least a first UE in a multi-user communication system is disclosed. The apparatus may include a channel estimation device configured to determine channel estimates for a plurality of different reverse-link signals to produce a plurality of channel estimates, a demodulation device configured to determine a first signal-to-noise (SNR) ratio for the first UE using the plurality of different channels estimates, and a data rate determining device configured to determine a first reverse-link data rate for the first UE using the first SNR.

公开(公告)号：CA2635212A1

公开(公告)日：2007-08-02

申请号：CA2635212

申请日：2007-01-23

Applicant: QUALCOMM INC

Inventor： KIM BYOUNG-HOON

IPC: H04L1/18 ,  H04B7/08 ,  H04L1/06 ,  H04L25/03 ,  H04L27/00

公开(公告)号：PL2179518T3

公开(公告)日：2020-09-07

申请号：PL08798037

申请日：2008-08-15

Applicant: QUALCOMM INC

Inventor： SARKAR SANDIP ,  KIM BYOUNG-HOON ,  MALLADI DURGA PRASAD ,  MONTOJO JUAN

IPC: H04B7/0426 ,  H04L1/00 ,  H04L5/00 ,  H04L25/03