公开(公告)号：EP0345282A1

公开(公告)日：1989-12-13

申请号：EP88901685.0

申请日：1988-01-11

申请人： MOTOROLA, INC.

发明人： STEEL, Francis, Robert ,  LEITCH, Clifford, Dana ,  SUAREZ, Jose, Ignacio

IPC分类号： H04L23 ,  H04L25 ,  H04L27

CPC分类号： H04L27/3494 ,  H04L23/02 ,  H04L25/03859 ,  H04L27/363 ,  H04L27/3854

摘要： Un procédé et un appareil permettent de générer une impulsion numérique prototypique à forme unique transmise en occupant une partie minimale du spectre de fréquence mais à une vitesse binaire relativement élevée. Ces impulsions numériques à forme unique sont enregistrées dans une mémoire (135) faisant partie de l'émetteur (100) jusqu'au moment voulu de transmission, moment où un positif de l'impulsion est transmis de façon à correspondre à un premier niveau logique ou le négatif de l'impuslsion est transmis de façon à correspondre à un deuxième niveau logique.

公开(公告)号：EP0398926B1

公开(公告)日：1995-05-10

申请号：EP89901829.5

申请日：1988-12-13

申请人： MOTOROLA, INC.

发明人： SIWIAK, Kazimierz ,  JASINSKI, Leon ,  STEEL, Francis, Robert

IPC分类号： H04Q7/00

CPC分类号： H04W84/025

摘要： An acknowledge back (ack-back) paging system (100) is provided which includes a central station (110) which transmits a group of message signals to a group of ack-back pagers (121, 122, ...) which are addressed as a group. The users of the group of addressed ack-back pagers indicate a response to their respective pagers thus providing ack-back data. The pagers in the group of addressed ack-back pagers (121, 122, ...) then simultaneously transmit back to the central station (110) their ack-back data on different frequency subbands, a different frequency sub-band being allocated to each of the pagers (121, 122, ...) in the group.

公开(公告)号：EP0438463B1

公开(公告)日：1995-04-05

申请号：EP89911496.1

申请日：1989-10-03

申请人： MOTOROLA, INC.

发明人： JASINSKI, Leon ,  STEEL, Francis, Robert

IPC分类号： H04Q7/08 ,  H04B1/00

CPC分类号： H04H20/67 ,  H04W84/022 ,  H04W88/185

摘要： A system (10) for transmitting long text messages includes a plurality of transmission cells (16) defining different geographical areas, each having a transmitter (12, 14) for simulcast address transmission at a first data bit rate and for transmitting the address and a message at a second data bit rate higher than the first data bit rate. A paging transceiver (18) generates and transmits an acknowledgment signal in response to receiving a transmitted address at the first data bit rate. Receivers (12/414, 14/414) located within each of the transmission cells (16) receive the transmitted acknowledgment signal. An apparatus (12/406) responsive to the received acknowledgment signal identifies the transmission cell (16) in which the paging transceiver (18) is located effecting the selection of the transmitter (12, 14) in the transmission cell (16) in which the paging transceiver (18) is located to transmit the address and message at the second data bit rate higher than the first data bit rate.

公开(公告)号：EP0434689B1

公开(公告)日：1995-08-16

申请号：EP89906916.5

申请日：1989-05-22

申请人： MOTOROLA, INC.

发明人： LEITCH, Clifford, D. ,  STEEL, Francis, Robert

IPC分类号： H04L27/14 ,  G11C11/26

CPC分类号： H04L27/22

摘要： A receiver circuit recovers the phase of the carrier of a received MSK signal so that conventional synchronous detection techniques can be employed to demodulate the received signal. A quadrature receiver circuit (204-214) processes the received MSK signal to produce in-phase and quadrature phase baseband signals. These I-channel and Q-channel baseband signals are viewed as one signal which is expressed as a complex number; the I-channel forming the real part and the Q-channel forming the imaginary part. The baseband signal is multiplied (218 and 220) by odd and even orthogonal functions (222 and 224) and then integrated (226 and 227) over odd and even numbered two bit periods, respectively. The odd orthogonal function begins and ends on odd numbered two bit periods of the received MSK signal, while the even orthogonal function begins and ends on even numbered two bit periods. The result of the integration is a single complex number for each bit of the received signal. From each of these complex numbers, two supplementary angles are computed (228 and 229). A phase error algorithm (230) resolves which one of the two supplementary angles is the phase error between the carrier of the received MSK signal and the oscillator (208 or 302) of the quadrature circuit by selecting the angle that is closer to the phase error that was calculated for the previous bit.

公开(公告)号：EP0345282B1

公开(公告)日：1994-04-13

申请号：EP88901685.3

申请日：1988-01-11

申请人： MOTOROLA, INC.

发明人： STEEL, Francis, Robert ,  LEITCH, Clifford, Dana ,  SUAREZ, Jose, Ignacio

IPC分类号： H04L25/49 ,  H04L27/34 ,  H04L27/20 ,  H04L5/12 ,  H04B1/02

CPC分类号： H04L27/3494 ,  H04L23/02 ,  H04L25/03859 ,  H04L27/363 ,  H04L27/3854

摘要： Method and apparatus for generating a uniquely shaped prototype digital pulse which is transmitted with minimal frequency spectrum consumption and yet a relatively high bit rate. Such uniquely shaped digital pulse is stored in a memory (135) included in a transmitter (100) until transmission is desired, at which time a positive of the pulse is transmitted to correspond to a first logic level or the negative of the pulse is transmitted to correspond to a second logic level.