公开(公告)号：AU5204399A

公开(公告)日：2000-01-05

申请号：AU5204399

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY SHERMAN A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.

公开(公告)号：CA2305718A1

公开(公告)日：1999-04-22

申请号：CA2305718

申请日：1998-10-09

Applicant: QUALCOMM INC

Inventor： SKINNER GORDON ,  BUTLER BRIAN ,  HARMS BRIAN

IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

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：DE69841326D1

公开(公告)日：2010-01-07

申请号：DE69841326

申请日：1998-10-09

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  BUTLER BRIAN ,  SKINNER GORDON DI

IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

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：DE69933869T2

公开(公告)日：2007-06-21

申请号：DE69933869

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.

公开(公告)号：DE69933869D1

公开(公告)日：2006-12-14

申请号：DE69933869

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.

公开(公告)号：DE69926767T2

公开(公告)日：2006-06-29

申请号：DE69926767

申请日：1999-09-08

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY SHERMAN

IPC: H04B1/7075 ,  H04B1/708

Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.

公开(公告)号：NO318825B1

公开(公告)日：2005-05-09

申请号：NO20001819

申请日：2000-04-07

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  BUTLER BRIAN K ,  SKINNER GORDON

IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

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：AU760427B2

公开(公告)日：2003-05-15

申请号：AU5204399

申请日：1999-06-14

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY SHERMAN A

IPC: H04B1/7073 ,  G01S1/00 ,  H04B1/707 ,  H04B7/216 ,  H04L27/00 ,  H04Q7/38

Abstract: A system and method for narrowing the range of frequency uncertainty of a Doppler shifted pilot signal in a satellite or other communications system with relative signal source and receiver motion. The satellite communications system includes a user terminal (for example, a mobile wireless telephone), a gateway (terrestrial base station), and at least one satellite with unknown position and unknown relative velocity. The method includes the steps of shifting the pilot signal over a plurality of frequency hypotheses, coherently accumulating samples of the pilot signal over a plurality of chips, measuring the energy of the accumulated pilot signal samples, accumulating the energy measurements over a plurality of chips to produce an energy accumulation value, and determining which of the plurality of frequency hypotheses results in the highest energy accumulation value.

公开(公告)号：HK1039696A1

公开(公告)日：2002-05-03

申请号：HK01109231

申请日：2001-12-31

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  GREGORY SHERMAN

IPC: H04B1/7075 ,  H04B1/708 ,  H04B

Abstract: The present invention is a method and apparatus for detecting the presence of or acquiring a signal in a data stream, where the signal has been spread using a pseudonoise sequence. The method comprises the steps of delaying a pseudonoise sequence by a plurality of predetermined delays to produce a plurality of delayed pseudonoise sequences, combining each of the delayed pseudonoise sequences with the data stream to produce a plurality of despread data streams, and accumulating each of the despread data streams for a preselected duration to produce a plurality of coherent sums. Each of the coherent sums are accumulated for a further duration to produce a plurality of non-coherent sums. The non-coherent sums are examined to determine the most likely PN offset hypothesis.

公开(公告)号：BR9813026A

公开(公告)日：2000-08-15

申请号：BR9813026

申请日：1998-10-09

Applicant: QUALCOMM INC

Inventor： HARMS BRIAN ,  BUTLER BRIAN ,  SKINNER GORDON

IPC: H04J13/12 ,  H04B1/707 ,  H04B1/7075 ,  H04B1/7077 ,  H04B7/216 ,  H04J13/00

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.