公开(公告)号：EP1029398B1

公开(公告)日：2009-11-25

申请号：EP98956104.8

申请日：1998-10-09

Applicant: QUALCOMM INCORPORATED

Inventor： HARMS, Brian ,  BUTLER, Brian ,  SKINNER, Gordon DI

IPC: H04B1/707 ,  H04B7/216

CPC classification number: H04B1/7077 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/70755 ,  H04B7/216 ,  H04J13/0022

Abstract: A technique for spreading information signals in a spread spectrum communication system to provide increased signal acquisition speed. A first PN spreading code or code set is used to spread information signals along with a second PN spreading code sequence or function. The second PN code is synchronized with the first PN spreading code, but has a larger code period so that each code chip of the second PN code extends over the entire period of the first PN code. The longer period spreading code forms an outer code which helps provide unambiguous beam identification and easily acquired frame timing in the presence of dynamically changing signal path delay, improving signal acquisition.

公开(公告)号：EP1023786A1

公开(公告)日：2000-08-02

申请号：EP98954979.5

申请日：1998-10-14

Applicant: QUALCOMM Incorporated

Inventor： SILBERGER, Amnon ,  BUTLER, Brian ,  SCHIFF, Leonard

IPC: H04B7/26 ,  G01R23/20 ,  H04Q7/38

CPC classification number: H04B17/0085 ,  H04B17/309

Abstract: A method and appararatus for accurately determining the operating characteristics or impact of nonlinear effects on devices or communication systems transferring orthogonally coded spread-spectrum communication signals. A Walsh Power Ratio, is used to more accurately determine system response. This information can be used by power control loops in controlling or adjusting the operation of nonlinear elements or stages such as high power amplifiers in orthogonal CDMA communication systems to provide improved system response. The information can also be employed in assigning channels to systems users, and to proceed with physical changes to system hardware. The measurements used to formulate the WPR can be made to individual components or to entire systems by injecting communication signals in multiple channels containing data, and leaving at least one empty channel. The received power per channel on the output side of the system or device is then measured. A ratio of power density for the empty to the active channels is then formed. The determination of WPR for a system or components can be realized during periods of operation through periodic transfer of test signals either at allocated times or by interleaving among existing traffic signals in the system.