公开(公告)号：CA2097693A1

公开(公告)日：1993-04-22

申请号：CA2097693

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： MUELLER BRUCE D ,  BORTH DAVID E ,  BAUM KEVIN L

IPC: H04L25/08 ,  H03M13/41 ,  H04L25/03 ,  H04L27/22

Abstract: A system and method for calculating survivor metrics in a Viterbi equalizer of a receiver, such as a receiver operative to receive a PSK-modulated signal, for example, a pi /4, differential, phase-shift-keying, modulated signal. The state transition metric, defined as a function of two successive states, is converted into a function defined by pairwise differences between allowable symbols of a PSK-modulated signal. When operative to receive the pi /4 DQPSK-modulated signal, the number of calculations required to calculate state transition metrics is reduced significantly.

公开(公告)号：MX167064B

公开(公告)日：1993-03-01

申请号：MX1987590

申请日：1990-03-13

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：CA1295755C

公开(公告)日：1992-02-11

申请号：CA576174

申请日：1988-08-31

Applicant: MOTOROLA INC

Inventor： LABEDZ GERALD P ,  BORTH DAVID E

IPC: H04L27/38 ,  H04B7/005 ,  H04B7/01 ,  H04B7/26 ,  H04B7/212

Abstract: of the Invention The method and apparatus for rapid phase acquisition and random radio channel phase error compensation for a TDMA QPSK receiver is disclosed. Received quadrature signals having a known synchronizing sequence transmitted on one of the vectors is correlated to a local replica of the sequence. The output correlation detection signals are held for the duration of the TDMA timeslot and multiplied by the received quadrature signals to produce two pairs of products. The mutually exclusive product pairs are summed to recover data having the random phase error compensated.

公开(公告)号：FI916141A0

公开(公告)日：1991-12-27

申请号：FI916141

申请日：1991-12-27

Applicant: MOTOROLA INC

Inventor： ARENS JOHN W ,  BORTH DAVID E ,  KEPLER JAMES F

IPC: H04B1/16 ,  H03G3/20 ,  H04B1/30 ,  H04B7/005 ,  H04L27/14 ,  H04L27/22 ,  H03G

Abstract: There is provided a mechanism for Automatic Gain Control in a receiver. It comprises: determining, within a certain dynamic range, the difference in power between the desired signal and a signal received, and providing open loop gain control for the signal in response to the differential so determined, scaled by the receiver's gain characteristics, such that the signal is positioned within dynamic range so as to reduce saturation and noise.

公开(公告)号：DK281790D0

公开(公告)日：1990-11-27

申请号：DK281790

申请日：1990-11-27

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：NO905055L

公开(公告)日：1990-11-22

申请号：NO905055

申请日：1990-11-22

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：CA2009468A1

公开(公告)日：1990-09-30

申请号：CA2009468

申请日：1990-02-07

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F

IPC: H04L27/38 ,  H03J7/02 ,  H03L20060101 ,  H03L7/00 ,  H03L7/087 ,  H04B7/26 ,  H04L27/00 ,  H04L27/227

Abstract: A frequency control apparatus for a burst-mode radio communications system (TDMA) employing a frequency correction signal transmitted as a burst to enable correction of frequency differences between the frequency of the radio carrier of a subsequent communication burst and the frequency of reception by a radio receiver, the frequency control apparatus including a variable frequency oscillator (115), for receiving a frequency correction signal burst and a digital signal processor (111) for processing a communication burst having a frequency difference between said variable frequency oscillator and the radio carrier frequency of said communication burst and for generating a singular control signal value and for applying said singular control signal value to said variable frequency oscillator (115), via an A/D converter, to correct said frequency difference.

公开(公告)号：CA2003580A1

公开(公告)日：1990-06-16

申请号：CA2003580

申请日：1989-11-22

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  KEPLER JAMES F M

IPC: H04L27/14 ,  H04L27/00 ,  H04L27/18 ,  H04L27/227

Abstract: There is provided a method of and apparatus for Automatic Frequency Control (AFC) in the presence of data. It comprises removing the effects of data modulated onto the carrier (25), detecting the frequency difference between the carrier frequency and the phase of the reference oscillator (30), and adjusting (80) the frequency of the reference oscillator (35) to eliminate the frequency difference ( DELTA ). It is further characterized by digitizing (40) the modulated carrier in quadrature, sampling (20) the modulated carrier in quadrature at a multiple of the modulated bit rate, rotating phases toward arctangent (I/Q)=0 (25/55/60) to remove the effects of quadrature data (I/Q) modulated onto the carrier, detecting (30) the frequency difference ( DELTA ) between the carrier frequency and the frequency of a Voltage Controlled type of reference oscillator (35) with a phase trajectory estimator (45), and establishing and generating the requisite correction voltage ( DELTA ) for a Voltage Controlled type of reference oscillator (VCO) (35) with the phase trajectory estimator (45).

公开(公告)号：FI884939A0

公开(公告)日：1988-10-26

申请号：FI884939

申请日：1988-10-26

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  WANG CHIH-FEI ,  RABE DUANE C ,  LABEDZ GERALD P

IPC: H04B7/185 ,  H04B7/26 ,  H04J3/00 ,  H04L27/22 ,  H04B

公开(公告)号：FI109852B

公开(公告)日：2002-10-15

申请号：FI934361

申请日：1993-10-04

Applicant: MOTOROLA INC

Inventor： BORTH DAVID E ,  HAUG JOHN R ,  RASKY PHILLIP D

IPC: H04B7/26 ,  H04W74/04 ,  H04Q7/00