公开(公告)号：CA2098011A1

公开(公告)日：1993-04-29

申请号：CA2098011

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34

Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：AU663109B2

公开(公告)日：1995-09-28

申请号：AU2467792

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04L5/12 ,  H03K7/00 ,  H03M9/00

Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：CA1336337C

公开(公告)日：1995-07-18

申请号：CA607442

申请日：1989-08-03

Applicant: MOTOROLA INC

Inventor： SOLOMON JAMES D

IPC: H03D3/00

Abstract: A method of recovering a frequency modulated signal wherein the frequency modulated information signal is sampled at a rate less than the Nyquist sampling rate, following which the under sampled signal can be demodulated to extract the original information signal.

公开(公告)号：BR9205509A

公开(公告)日：1994-04-05

申请号：BR9205509

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04L5/12

Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：GB2266645B

公开(公告)日：1996-05-08

申请号：GB9312028

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04L5/12 ,  H04L23/02

Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：GB2266645A

公开(公告)日：1993-11-03

申请号：GB9312028

申请日：1992-08-14

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04L5/12 ,  H04L23/02

Abstract: A quad 16 QAM transmission (132-136) and reception (600) methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses (200). Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference (402 and 301) for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：MX9206164A

公开(公告)日：1993-04-01

申请号：MX9206164

申请日：1992-10-26

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN C ,  BIRCHLER MARK A ,  SOLOMON JAMES D

IPC: H04L1/02 ,  H04B1/707 ,  H04B3/10 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04B1/00

Abstract: A quad 16 QAM transmission and reception methodology wherein a time domain pilot reference is advantageously associated therewith. There may be one or more such pilot references for each packet of multiple 16 QAM pulses. Depending upon the embodiment, each 16 QAM pulse can include a time domain pilot reference, or an estimated pilot reference for that pulse can be determined either by reference to pilot references in other pulses sharing the same packet, or by reference to pilot references for other previously received 16 QAM pulses corresponding to that same pulse.

公开(公告)号：AU6141290A

公开(公告)日：1991-04-08

申请号：AU6141290

申请日：1990-08-02

Applicant: MOTOROLA INC

Inventor： JOHNSON MARK J ,  SOLOMON JAMES D

IPC: H04B1/10 ,  H03G3/34 ,  H04B1/16

Abstract: An improved method of statistically determining the presence of noise on an FM communications channel permits digital signal processing techniques to more reliably squelch unnecesssary segments of an FM receiver reducing noise and power consumption. Digital samples of an FM signal having real (in-phase) and imaginary (phase quadrature) components representing the real and imaginary components of a phasor rotating about the origin of a Cartesian coordinate system at a rate indicative of a signal on the channel are mathematically operated on. Successive digital samples are multiplied by the complex conjugate of temporally adjacent samples producing a new stream of phasors representative of the phase change between samples. The phase changes between samples are processed to produce a number that indicates the probability of the channel having noise present. This number indicative of the probability of noise content is compared to a threshold value and used to decide whether or not successive receiver stages should be squalched or unsquelched.