公开(公告)号：DE69131503D1

公开(公告)日：1999-09-09

申请号：DE69131503

申请日：1991-12-16

Applicant: MOTOROLA INC

Inventor： WILSON ALAN ,  CUDAK MARK ,  HIBEN BRADLEY ,  ZIOLKO ERIC ,  JASPER STEVEN

IPC: H04L27/10 ,  H04L27/00 ,  H04L27/18

Abstract: A transceiver compatible with both wide channel constant envelope 4 level FSK FM modulation and narrow channel pi /4 differential QPSK linear modulation allows compatible interaction between modified constant envelope and non-constant envelope transmitters. All Nyquist filtering occurs in the transmitters, and none in the receiver.

公开(公告)号：DE69228801D1

公开(公告)日：1999-05-06

申请号：DE69228801

申请日：1992-09-23

Applicant: MOTOROLA INC

Inventor： JASPER STEVEN ,  BIRCHLER MARK

IPC: H04J11/00 ,  H04J1/00 ,  H04L27/26 ,  H04L27/34 ,  H04L5/06

Abstract: In a digital communication system in which pulse-shape filtered sync, pilot, and data symbols, arranged in successive time slots, modulate sub-channel carriers via sub-channel mixers to form sub-channel symbol streams for combination into a composite signal for transmission, deterministic portions of each time slot are rendered identical by determining phase difference of sub-channel carriers and rotating the phase of each sub-channel symbol stream by an amount equal to the phase difference, but with opposite sign.