公开(公告)号：DE69032053T2

公开(公告)日：1998-09-10

申请号：DE69032053

申请日：1990-09-04

Applicant: MOTOROLA INC

Inventor： SMITH JOHN M ,  SCHULER JOSEPH J

IPC: H01Q3/24 ,  H04W88/08 ,  H04Q7/36

Abstract: An antenna switching system for handling high traffic sectors in a cellular radiotelephone system. The system switches the cell's base station transmitters (210) to sectors that have more mobile traffic than they can handle. The additional transmitters (210) increase the number of frequencies in the overloaded sector, thereby allowing a greater amount of mobile traffic to use the cell.

公开(公告)号：ES2112831T3

公开(公告)日：1998-04-16

申请号：ES90309664

申请日：1990-09-04

Applicant: MOTOROLA INC

Inventor： SMITH JOHN M ,  SCHULER JOSEPH J

IPC: H01Q3/24 ,  H04W88/08 ,  H04Q7/36

Abstract: An antenna switching system for handling high traffic sectors in a cellular radiotelephone system. The system switches the cell's base station transmitters (210) to sectors that have more mobile traffic than they can handle. The additional transmitters (210) increase the number of frequencies in the overloaded sector, thereby allowing a greater amount of mobile traffic to use the cell.

公开(公告)号：DK0416872T3

公开(公告)日：1998-03-30

申请号：DK90309664

申请日：1990-09-04

Applicant: MOTOROLA INC

Inventor： SMITH JOHN M ,  SCHULER JOSEPH J

IPC: H01Q3/24 ,  H04W88/08 ,  H04Q7/04

Abstract: An antenna switching system for handling high traffic sectors in a cellular radiotelephone system. The system switches the cell's base station transmitters (210) to sectors that have more mobile traffic than they can handle. The additional transmitters (210) increase the number of frequencies in the overloaded sector, thereby allowing a greater amount of mobile traffic to use the cell.

公开(公告)号：DE69032053D1

公开(公告)日：1998-03-26

申请号：DE69032053

申请日：1990-09-04

Applicant: MOTOROLA INC

Inventor： SMITH JOHN M ,  SCHULER JOSEPH J

IPC: H01Q3/24 ,  H04W88/08 ,  H04Q7/36

Abstract: An antenna switching system for handling high traffic sectors in a cellular radiotelephone system. The system switches the cell's base station transmitters (210) to sectors that have more mobile traffic than they can handle. The additional transmitters (210) increase the number of frequencies in the overloaded sector, thereby allowing a greater amount of mobile traffic to use the cell.

公开(公告)号：NZ270872A

公开(公告)日：1997-01-29

申请号：NZ27087291

申请日：1991-12-20

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH J

IPC: H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04L25/30 ,  H04B1/10 ,  H04L27/01 ,  H04L27/38

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

公开(公告)号：AU657287B2

公开(公告)日：1995-03-09

申请号：AU9165491

申请日：1991-12-17

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH J

IPC: H04B1/10 ,  H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04L25/30 ,  H04L27/01 ,  H04L27/38

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

公开(公告)号：BR9107237A

公开(公告)日：1994-04-05

申请号：BR9107237

申请日：1991-12-17

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH J

IPC: H04B1/10 ,  H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04L25/30 ,  H04L27/01 ,  H04L27/38

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.

公开(公告)号：MX167843B

公开(公告)日：1993-04-15

申请号：MX2324490

申请日：1990-11-08

Applicant: MOTOROLA INC

Inventor： SCHULER JOSEPH J ,  WERRONEN ALTON P ,  LABEDZ GERALD P ,  ATKINSON FREDERICK G ,  RABE DUANE C

IPC: H04B7/08 ,  H04L1/06 ,  H04B7/005

Abstract: A method and apparatus for diversity reception in a communication system is provided. A dual branch receiver (100, 101) is provided with a stored replica of expected reference information (104) so that correlation with received time-dispersed signals produces an estimate of the transmission channel's impulse response as seen by each branch (100, 101), and determines, among other things, phase error between the branch local oscillators (208, 209) and the time-dispersed signals. Matched filters (214, 215) are constructed which then coherently align the time-dispersed signals from each branch (100, 101) with that branch's local oscillator (208, 209) which constitutes a part of the signal equalization. A diversity processor (105) performs bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, followed by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal.

公开(公告)号：PT95871A

公开(公告)日：1992-10-30

申请号：PT9587190

申请日：1990-11-13

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD PAUL ,  ATKINSON FREDERICK G ,  RABE DUANE C ,  SCHULER JOSEPH J ,  WERRONEN ALTON P

IPC: H04B7/08 ,  H04L1/06 ,  H04B7/00 ,  H04L1/00

Abstract: A method and apparatus for diversity reception in a communication system is provided. A dual branch receiver (100, 101) is provided with a stored replica of expected reference information (104) so that correlation with received time-dispersed signals produces an estimate of the transmission channel's impulse response as seen by each branch (100, 101), and determines, among other things, phase error between the branch local oscillators (208, 209) and the time-dispersed signals. Matched filters (214, 215) are constructed which then coherently align the time-dispersed signals from each branch (100, 101) with that branch's local oscillator (208, 209) which constitutes a part of the signal equalization. A diversity processor (105) performs bit by bit selection on the re-aligned signals, maximal ratio combining of the re-aligned signals, or equal gain combining of the re-aligned signals, followed by a sequence estimation which uses similarly selected or combined channel distortion compensation parameters to complete the equalization process on the new signal.

公开(公告)号：AU9165491A

公开(公告)日：1992-07-22

申请号：AU9165491

申请日：1991-12-17

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  KOTZIN MICHAEL D ,  SCHULER JOSEPH J ,  ZIOLKO ERIC F

IPC: H04B1/10 ,  H04B7/005 ,  H04L25/02 ,  H04L25/03 ,  H04L25/30 ,  H04L27/01 ,  H04L27/38

Abstract: An equalization system for equalizing a corrupted signal is disclosed. The equalization system includes a complex matched filter (400) and a maximum likelihood sequence estimator (MLSE) (405) for removing the effects of phase shift, amplitude variations, intersymbol interference, etc. resulting from multi-pathing and noise contributed by the receiver front end. The system estimates a correlation signal C(t) (505) and synchronizes C(t) 505 to maximize its energy as seen on the taps of the complex matched filter (400). Taps having amplitude coefficients below a predetermined threshold are set to zero to produce a modified CIR estimate. The modified CIR estimate which has had the effects of noise virtually eliminated, is then used to construct the complex matched filter (400) and is also used as input to the MLSE (405) to produce a better equalized data signal.