公开(公告)号：FI981309A

公开(公告)日：1998-06-08

申请号：FI981309

申请日：1998-06-08

Applicant: MOTOROLA INC

Inventor： BROWN TYLER A ,  THOMPSON DENNIS J ,  LING FUYUN

IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H04L

Abstract: A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).

公开(公告)号：CA2217574A1

公开(公告)日：1997-09-04

申请号：CA2217574

申请日：1996-12-13

Applicant: MOTOROLA INC

Inventor： SPEAR STEPHEN L ,  CSAPO JOHN S ,  SCHAEFFER DENNIS R ,  KOTZIN MICHAEL D ,  THOMPSON DENNIS J

IPC: H04B7/26 ,  H04W36/04 ,  H04Q7/38 ,  H04Q7/36

Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects o f excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so tha t the cumulative time delay at a transition cell (209, 325, 331) is reduced. I n another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403- 407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverag e area (130), a hand-off of a communication of a mobile station (128) into the target coverage area (130) can be performed.

公开(公告)号：FI981309A0

公开(公告)日：1997-08-13

申请号：FI981309

申请日：1998-06-08

Applicant: MOTOROLA INC

Inventor： BROWN TYLER A ,  THOMPSON DENNIS J ,  LING FUYUN

IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H04L

Abstract: A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).

公开(公告)号：CA2238329C

公开(公告)日：2001-03-27

申请号：CA2238329

申请日：1997-08-13

Applicant: MOTOROLA INC

Inventor： BROWN TYLER A ,  LING FUYUN ,  THOMPSON DENNIS J

IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H03D3/00

Abstract: A receiver includes both a coherent and noncoherent demodulator (222). When the confidence that estimates of the channel is high, the coherent demodulat or (408, 409, 425, 412) is implemented (400, 418). When the confidence that estimates of the channel is low, the noncoherent demodulator (422, 421) is implemented. A controlling microprocessor controls the selection process and also provides a signal to enable the noncoherent demodulator in instances wh en noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station from a source base-station to a target base- station.

公开(公告)号：CA2238329A1

公开(公告)日：1998-04-30

申请号：CA2238329

申请日：1997-08-13

Applicant: MOTOROLA INC

Inventor： LING FUYUN ,  THOMPSON DENNIS J ,  BROWN TYLER A

IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H03D3/00

Abstract: A receiver includes both a coherent and noncoherent demodulator (222). When the confidence that estimates of the channel is high, the coherent demodulator (408, 409, 425, 412) is implemented (400, 418). When the confidence that estimates of the channel is low, the noncoherent demodulator (422, 421) is implemented. A controlling microprocessor controls the selection process and also provides a signal to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station from a source base-station to a target basestation.

公开(公告)号：CA2217574C

公开(公告)日：2001-06-19

申请号：CA2217574

申请日：1996-12-13

Applicant: MOTOROLA INC

Inventor： SPEAR STEPHEN L ,  THOMPSON DENNIS J ,  CSAPO JOHN S ,  KOTZIN MICHAEL D ,  SCHAEFFER DENNIS R

IPC: H04B7/26 ,  H04W36/04 ,  H04Q7/38 ,  H04Q7/36

Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects o f excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so tha t the cumulative time delay at a transition cell (209, 325, 331) is reduced. I n another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403- 407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverag e area (130), a hand-off of a communication of a mobile station (128) into the target coverage area (130) can be performed.

公开(公告)号：BR9706879A

公开(公告)日：2000-01-25

申请号：BR9706879

申请日：1997-08-13

Applicant: MOTOROLA INC

Inventor： BROWN TYLER A ,  THOMPSON DENNIS J ,  LING FUYUN

IPC: H04L27/22 ,  H04B1/707 ,  H04L1/00 ,  H04L27/227 ,  H04L27/233 ,  H03D3/00

Abstract: A receiver (156) includes both a coherent and noncoherent demodulator. When the confidence that estimates of the channel is high, the coherent demodulator is implemented. When the confidence that estimates of the channel is low, the noncoherent demodulator is implemented. A controlling microprocessor (162) controls the selection process and also provides a signal (158) to enable the noncoherent demodulator in instances when noncoherent demodulation would most likely be better than coherent demodulation. As an example, such an instance would be immediately after handoff of a mobile station (505) from a source base-station (503) to a target base-station (502).

公开(公告)号：BR9604987A

公开(公告)日：1999-05-25

申请号：BR9604987

申请日：1996-12-13

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  SCHAEFFER DENNIS R ,  CSAPO JOHN S ,  THOMPSON DENNIS J ,  SPEAR STEPHEN L

IPC: H04B7/26 ,  H04W36/04 ,  H04Q7/38

Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects of excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so that the cumulative time delay at a transition cell (209, 325, 331) is reduced. In another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403-407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverage area (130), a handoff of a communication of a mobile station (128) into the target coverage area (130) can be performed.

公开(公告)号：EP0824843A4

公开(公告)日：2000-08-09

申请号：EP96943761

申请日：1996-12-13

Applicant: MOTOROLA INC

Inventor： KOTZIN MICHAEL D ,  SCHAEFFER DENNIS R ,  CSAPO JOHN S ,  THOMPSON DENNIS J ,  SPEAR STEPHEN L

IPC: H04B7/26 ,  H04W36/04 ,  H04Q7/38

CPC classification number: H04W36/04

Abstract: A wireless communication system (200, 300, 400, 500) mitigates the effects of excess timing delay caused by varying lengths of communication paths. In one general implementation, a transition communication path (206, 323, 329) is used to transfer a time-advanced version of a timing reference signal so that the cumulative time delay at a transition cell (209, 325, 331) is reduced. In another general implementation, the timing reference signal is time-advanced in all communication paths (403-411), and selected communication paths (403-407) include a time delay means (423-427, 503-507) such that the cumulative time delay at an area (421) near a target coverage area (130) is reduced. By reducing the cumulative time delay at the area (421) near the target coverage area (130), a hand-off of a communication of a mobile station (128) into the target coverage area (130) can be performed.