US Patent No: 5,781,543

Number of patents in Portfolio can not be more than 2000

Power-efficient acquisition of a CDMA pilot signal

2 Status Updates

Stats

ATTORNEY / AGENT: (SPONSORED)
 

Importance

Loading Importance Indicators... loading....

Abstract

A system and method for acquiring a code division multiple access (CDMA) pilot signal having a pilot pseudonoise (PN) code offset in a CDMA communication system. A received signal is correlated with a first set of PN code offset hypotheses. If this first "full" search is unsuccessful in acquiring the CDMA pilot signal, the method includes waiting for a first period, and then correlating the received signal with a second set of PN code offset hypotheses which are a subset of said first set of PN code offset hypotheses and therefore requires less search time. If this "mini" search is unsuccessful in acquiring the CDMA pilot signal the method includes waiting for a second period and then quickly measuring the energy of the received signal. If the received energy exceeds a threshold, then a "mini" search is immediately performed. These alternating search techniques of full, mini, micro are repeated.

Loading the Abstract Image... loading....

First Claim

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
QUALCOMM INCORPORATEDSAN DIEGO, CA7516

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ault, Jan C Santee, CA 14 360
Hughes, Robbin D San Diego, CA 17 248

Cited Art

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (2)
5,566,357 Power reduction in a cellular radiotelephone 22 1994
5,644,591 Method and apparatus for performing search acquisition in a CDMA communications system 137 1996
 
APPLE INC. (1)
5,167,024 Power management for a laptop computer with slow and sleep modes 552 1992
 
ERICSSON INC. (1)
5,590,396 Method and apparatus for a deep-sleep mode in a digital cellular communication system 116 1994
 
KABUSHIKI KAISHA TOSHIBA (1)
5,203,020 Method and apparatus for reducing power consumption in a radio telecommunication apparatus 55 1991
 
MOTOROLA MOBILITY LLC (1)
5,566,366 Method of power conservation in a data communications system 52 1994
 
NTT DOCOMO, INC. (1)
5,694,388 CDMA demodulator and demodulation method 78 1995
 
SONY CORPORATION (1)
5,363,430 Cordless telephone apparatus having a low power stand-by mode and a hold mode 13 1993
 
UNISYS CORPORATION (1)
5,696,789 Apparatus and method for signal identification 15 1995

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
QUALCOMM INCORPORATED (19)
6,542,743 Method and apparatus for reducing pilot search times utilizing mobile station location information 75 1999
6,661,833 PN generators for spread spectrum communications systems 21 2000
6,775,252 Dynamic adjustment of search window size in response to signal strength 20 2000
7,020,180 Method and apparatus for acquiring pilots over code space and frequency errors in a CDMA communication system 16 2001
7,586,837 Acquisition of a gated pilot signal 0 2002
7,236,796 Method and apparatus for reducing pilot search times utilizing mobile station location information 10 2003
7,295,857 Method and apparatus for performing acquisition in power save mode for wireless communication systems 1 2003
7,508,790 Configuration of overhead channels in a mixed bandwidth system 3 2004
7,486,653 Configuration of overhead channels in a mixed bandwidth system 0 2004
7,447,189 Configuration of overhead channels in a mixed bandwidth system 3 2004
8,068,530 Signal acquisition in a wireless communication system 0 2004
8,027,372 Signal acquisition in a wireless communication system 0 2004
7,742,447 Method and apparatus for performing acquisition in power save mode for wireless communication systems 2 2005
8,422,955 Channel estimation for interference cancellation 0 2005
8,406,695 Joint interference cancellation of pilot, overhead and traffic channels 0 2005
8,099,123 Adaptation of transmit subchannel gains in a system with interference cancellation 5 2005
8,385,388 Method and system for signal reconstruction from spatially and temporally correlated received samples 0 2006
7,903,770 Method and apparatus for canceling pilot interference in a wireless communication system 2 2007
8,095,142 Configuration of overhead channels in a mixed bandwidth system 0 2008
 
INTEL CORPORATION (9)
8,175,120 Minimal maintenance link to support synchronization 0 2001
7,936,728 System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system 0 2001
8,155,096 Antenna control system and method 0 2001
7,773,566 System and method for maintaining timing of synchronization messages over a reverse link of a CDMA wireless communication system 0 2004
7,480,280 Fast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system 2 2005
8,134,980 Transmittal of heartbeat signal at a lower level than heartbeat request 1 2007
8,274,954 Alternate channel for carrying selected message types 0 2009
8,139,546 System and method for maintaining wireless channels over a reverse link of a CDMA wireless communication system 0 2010
8,437,330 Antenna control system and method 0 2012
 
GLOBAL LOCATE, INC. (7)
6,891,880 Method and apparatus for performing signal correlation 10 2002
7,190,712 Method and apparatus for performing signal correlation 7 2003
7,184,464 Apparatus for computing signal correlation at multiple resolutions 4 2003
7,567,636 Method and apparatus for performing signal correlation using historical correlation data 4 2003
7,995,682 Method and apparatus for performing signal processing using historical correlation data 0 2005
8,170,086 Method and apparatus for performing signal correlation 1 2007
8,411,726 Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference 0 2009
 
SAMSUNG ELECTRONICS CO., LTD. (6)
6,445,728 Method of establishing search window size for a mobile station in a cellular system 17 1999
7,400,667 Receiver for receiving a spectrum dispersion signal 1 2007
7,447,256 Receiver for receiving a spectrum dispersion signal 1 2007
7,471,715 Receiver for receiving a spectrum dispersion signal 2 2007
8,155,643 Mobile terminal and system scan method thereof 0 2008
8,130,816 Receiver for receiving a spectrum dispersion signal 0 2008
 
TEXAS INSTRUMENTS INCORPORATED (3)
6,275,483 Fast and accurate identification of spread spectrum signals 14 1998
6,519,237 Apparatus and method for parallel searching and correlating for CDMA system 10 1999
8,126,092 Multistage PN code acquisition circuit and method 0 2004
 
CISCO TECHNOLOGY, INC. (2)
6,760,671 Method and apparatus of low power energy detection for a WLAN 18 2002
7,472,027 Method and apparatus of low power energy detection for a WLAN 2 2004
 
INTERDIGITAL TECHNOLOGY CORPORATION (2)
7,496,072 System and method for controlling signal strength over a reverse link of a CDMA wireless communication system 1 2001
7,746,830 System and method for maintaining wireless channels over a reverse link of a CDMA wireless communication system 0 2005
 
BROADCOM CORPORATION (1)
7,672,358 Method and apparatus for performing signal correlation at multiple resolutions to mitigate multipath interference 2 2006
 
CELLCO PARTNERSHIP D/B/A VERIZON WIRELESS (1)
6,963,588 System and methodology for automatically setting a clock 6 2000
 
DENSO CORPORATION (1)
6,724,745 Processing reduction in CDMA telephones 1 2000
 
ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE (1)
7,103,084 Apparatus and method for searching preamble signal based on small search window 4 2002
 
ERICSSON AB (1)
6,944,147 System and method for maximizing capacity in a telecommunications system 10 2001
 
INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE (1)
7,590,165 Sub-system based window placement and size decision mechanism and method thereof 0 2005
 
INTERDIGITAL CORPORATION (1)
7,602,749 Fast acquisition of traffic channels for a highly variable data rate reverse link of a CDMA wireless communication system 0 2002
 
LG ELECTRONICS INC. (1)
7,257,097 Apparatus for searching a signal in mobile communication system and method thereof 1 2001
 
LUCENT TECHNOLOGIES INC. (1)
6,542,756 Method for detecting forward link power control bits in a communication system 6 2000
 
MOBILE SATELLITE VENTURES, LP (1)
7,453,920 Code synchronization in CDMA satellite wireless communications system using uplink channel detection 21 2005
 
MORPHICS TECHNOLOGY, INC. (1)
7,031,376 Fast initial acquisition and search device for a spread spectrum communication system 0 2000
 
MOTOROLA MOBILITY LLC (1)
7,031,271 Method of and apparatus for activating a spread-spectrum radiotelephone 12 1999
 
NEC CORPORATION (1)
7,079,569 Search method in CDMA mobile communication receiving system and receiving device 5 2000
 
NXP B.V. (1)
6,959,053 Method and apparatus for searching for a pre-defined code in a bit stream 3 2001
 
SONY CORPORATION (1)
5,966,402 Method and apparatus for detecting pilot signals and subscriber 14 1996
 
UNWIRED PLANET, LLC (1)
6,421,371 Modulation sequence synchronization methods and apparatus employing partial sequence correlation 7 1998
 
VIA TELECOM CO., LTD. (1)
6,064,691 Method and apparatus for acquisition of the strongest pilot signal 4 1997
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (2)
6,700,922 System and method for acquiring a received signal in a spread spectrum device 3 2003
8,442,441 Traffic interference cancellation 0 2005