公开(公告)号：EP1105976A1

公开(公告)日：2001-06-13

申请号：EP99941226.5

申请日：1999-08-17

Applicant: QUALCOMM Incorporated

Inventor： LUNDBY, Stein, A. ,  TIEDEMANN, Edward, G., Jr. ,  HOLTZMAN, Jack, M. ,  TERASAWA, Daisuke

IPC: H04B1/707 ,  H04B7/005 ,  H04L27/26

CPC classification number: H04B1/707 ,  H04B1/7097 ,  H04B2201/70701 ,  H04B2201/70706 ,  H04B2201/70709 ,  H04W52/30

Abstract: A method for limiting peak transmit power in a CDMA communication system by transmitting a first communication signal having a first high transmit power region, and transmitting a second communication signal having a second high transmit power region. A first and a second communication signal are time offset to prevent the first and second high transmit power regions from occurring simultaneously. Time shifting only a portion of the first and second communication signals is also taught. The first and second communication signals can also include respective first and second low transmit power regions. The time offset can be selected to align one of the first and second high transmit power regions with one of the first and second low transmit power regions. The total transmit power signal can be determined and the time offset can be selected to minimize a peak level of the total transmit power signal. The communication signals are separated into a plurality of portions and portions of the first and second communication signals are time offset to re-order the sequence of transmission of the plurality of portions.

公开(公告)号：EP1317804B1

公开(公告)日：2013-10-09

申请号：EP01968248.3

申请日：2001-08-28

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-Shan ,  AGRAWAL, Avneesh ,  TERASAWA, Daisuke

IPC: H04B1/707 ,  H03M13/27

CPC classification number: H03M13/271 ,  H04B1/707

公开(公告)号：EP1116345B1

公开(公告)日：2011-10-19

申请号：EP99943984.7

申请日：1999-08-30

Applicant: QUALCOMM INCORPORATED

Inventor： LUNDBY, Stein, A. ,  TIEDEMANN, Edward, G., Jr. ,  HOLTZMAN, Jack ,  TERASAWA, Daisuke

IPC: H04B7/26 ,  H04B1/707

CPC classification number: H04W52/36 ,  H04B1/707 ,  H04B2201/70706 ,  H04B2201/709709

Abstract: A first signal (74a) and a second signal (74b) are time-offset by a period t0. Careful selection of the period to allows the peak-to-average transmit power ratio to be reduced.

公开(公告)号：EP1559208B1

公开(公告)日：2009-11-18

申请号：EP03781531.3

申请日：2003-10-24

Applicant: QUALCOMM INCORPORATED

Inventor： SHIU, Da-Shan ,  TERASAWA, Daisuke

IPC: H04B7/06 ,  H04B7/02

CPC classification number: H04W8/02 ,  H04B7/022 ,  H04B7/0613 ,  H04B7/0617 ,  H04B7/0619 ,  H04B7/0669 ,  H04W64/00 ,  H04W99/00

公开(公告)号：EP1535398B1

公开(公告)日：2008-10-29

申请号：EP03791974.3

申请日：2003-08-29

Applicant: QUALCOMM INCORPORATED

Inventor： SENDONARIS, Andrew ,  SHIU, Da-shan ,  PATTERSON, David M. ,  SUBRAHMANYA, Parvathanathan ,  TERASAWA, Daisuke

IPC: H04B1/707

CPC classification number: H04B1/70754

公开(公告)号：EP1110360B1

公开(公告)日：2005-11-09

申请号：EP99942536.6

申请日：1999-08-30

Applicant: QUALCOMM INCORPORATED

Inventor： HOLTZMAN, Jack ,  TERASAWA, Daisuke ,  RAZOUMOV, Leonid

IPC: H04L27/26 ,  H04B1/707 ,  H04J11/00 ,  H04B7/005

CPC classification number: H04W52/04 ,  H04B1/707 ,  H04B1/7103 ,  H04B2201/70701 ,  H04B2201/70706 ,  H04J13/004 ,  H04J13/0048 ,  H04J13/12 ,  H04L27/2615 ,  H04L2025/03777

Abstract: The invention provides a method and apparatus for reducing transmission signal power or interference of transmitted communication signals suitable for use in a communication system having a base station and a plurality of user stations that exchange communication signals with the base station. An input node receives channel data for transmission on a plurality of channels to the plurality of user stations, wherein the channel data includes pilot symbol data. A processor determines symbol positions in which each of the plurality of user stations expect to find pilot symbols. A transmitter transmits to the plurality of user stations pilot symbols only in symbol positions that the plurality of user stations expect to find pilot symbols, and failing to transmit pilot symbols in other symbol positions.

公开(公告)号：EP1535398A2

公开(公告)日：2005-06-01

申请号：EP03791974.3

申请日：2003-08-29

Applicant: QUALCOMM Incorporated

Inventor： SENDONARIS, Andrew ,  SHIU, Da-shan ,  PATTERSON, David M. ,  SUBRAHMANYA, Parvathanathan ,  TERASAWA, Daisuke

IPC: H04B1/00

CPC classification number: H04B1/70754

Abstract: A method and apparatus for using information about a mobile terminal's location relative to a base station can improve performance of a communication system. In addition, information about the mobile terminal's velocity relative to the base station may be used to improve performance of the communication system. The location information may be used to estimate a nominal PN offset, and a set of PN offset to use, for processing communication signals. The velocity information may be used to estimate a nominal frequency of the communication signals.

公开(公告)号：EP1316161A2

公开(公告)日：2003-06-04

申请号：EP01966606.4

申请日：2001-09-05

Applicant: QUALCOMM INCORPORATED

Inventor： AGRAWAL, Avneesh ,  TERASAWA, Daisuke

IPC: H04B7/26 ,  H04B1/707

CPC classification number: H04J13/0044 ,  H04B7/2628 ,  H04B2201/70705 ,  H04B2201/709709

Abstract: Techniques for recovering data transmitted on a physical channel in which channelization code is not known at the time of the data recovery. A modulated signal is received and processed to provide received samples (612). A hypothesized channelization code (e.g., an OVSF code in the W-CDMA system) is selected (616) and used to process the received samples to generate partially processed symbols (618). The hypothesized channelization code is a 'base' code that can be used to generate all possible channelization codes that may have been used for the physical channel. Intermediate results representative of the partially processed symbols are stored (622) and, upon determination of the actual channelization code (624), further processed (626) in accordance with the actual and hypothesized channelization codes to provide the final results. The additional processing includes partitioning the intermediate results into sets, scaling each intermediate result in a particular set with a scaling factor (+1 or 1) determined by the actual and hypothesized channelization codes, and combining the scaled results in each set to obtain a final result. In the STTD mode in the W-CDMA system, the final results from multiple actual OVSF code intervals can be selectively combine to obtain a recovered symbol (628).

公开(公告)号：EP1190497A1

公开(公告)日：2002-03-27

申请号：EP00939622.7

申请日：2000-06-07

Applicant: QUALCOMM Incorporated

Inventor： TERASAWA, Daisuke ,  AGRAWAL, Avneesh

IPC: H04B1/707 ,  H04B7/26

CPC classification number: H04J13/00 ,  H04B1/7097 ,  H04B2201/70706 ,  H04L7/041 ,  H04W56/0085

Abstract: A method for mitigating the effect of interference between a fist base station and a second base station, the first base station and second base stations both sharing a same primary synchronization code. The method includes generating a primary synchronization channel having the primary synchronization code. In a W-CDMA system, all base stations share this primary synchronization code, causing code timing collisions. The present invention includes rotating the primary synchronization channel in phase according to a phase rotation sequence before transmitting the primary synchronization channel. By rotating the primary synchronization channel in phase according to the phase rotation sequence, the interference can be reduced. The phase rotation sequence may be pseudorandom in phase. The phase rotation sequence may include changing phase once per slot, or alternately once per frame. The phase rotation sequence may also be based at least in part on a secondary synchronization code.

公开(公告)号：EP1155591A1

公开(公告)日：2001-11-21

申请号：EP00913612.8

申请日：2000-02-25

Applicant: QUALCOMM Incorporated

Inventor： TIEDEMANN, Edward, G., Jr. ,  TERASAWA, Daisuke ,  SHANBHAG, Abhijit, G. ,  JOU, Yu-Cheun ,  ODENWALDER, Joseph, P. ,  WILLENEGGER, Serge ,  SARKAR, Sandip

IPC: H04Q7/38

CPC classification number: H04W56/002 ,  H04B2201/70701 ,  H04B2201/709709 ,  H04J3/0638 ,  H04J3/0682 ,  H04J13/0048 ,  H04J13/18 ,  H04W48/12

Abstract: A method and system for generating forward link channels in a synchronous CDMA base station having a pilot pseudonoise (PN) sequence with a pilot PN sequence offset. In one embodiment, the method includes the steps of generating a sync channel (302) including a sync channel message; generating an identification channel including at least the pilot PN sequence offset; and orthogonalizing the sync channel and the identification channel. The identification channel and the sync channel are both transmitted. However, the mobile station may get the pilot PN offset from the identification channel quickly, rather than having to demodulate the entire sync channel message. The identification channel may further include an indication of the phase of the pilot PN sequence, and the epoch of the pilot PN sequence. In one embodiment, the method includes encoding the identification channel using a Golay code.