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    FREQUENCY AGILE TDMA COMMUNICATIONS SYSTEM
    84.
    发明专利
    FREQUENCY AGILE TDMA COMMUNICATIONS SYSTEM 未知

    公开(公告)号：CA2068430A1

    公开(公告)日：1992-04-06

    申请号：CA2068430

    申请日：1991-09-25

    Applicant: MOTOROLA INC

    Inventor： FREEBURG THOMAS A ,  GERHARDT WILLY ,  LEY JOHN

    IPC: H04J3/00 ,  H04B7/26 ,  H04J3/16 ,  H04J4/00

    Abstract: An intelligent communcations node is capable of dynamically selecting frequency and time slot assignments for communications with remote communication devices having different communication protocols including different available frequencies and time slots in a TDMA system. A frequency agile transmitter and receiver combined with an adaptable time slot selector enables communications with remote devices utilizing different protocols. The time and frequency management capabilities of the node makes greater spectral efficiencies possible.

    HIGH BIT RATE COMMUNICATIONS SYSTEM FOR OVERCOMING MULTIPATH
    85.
    发明专利
    HIGH BIT RATE COMMUNICATIONS SYSTEM FOR OVERCOMING MULTIPATH 未知

    公开(公告)号：AU615305B2

    公开(公告)日：1991-09-26

    申请号：AU3607489

    申请日：1989-06-06

    Applicant: MOTOROLA INC

    Inventor： FREEBURG THOMAS A

    IPC: H04B7/26 ,  H04B7/08 ,  H04B7/10 ,  H04W16/24 ,  H04B7/005

    Abstract: A communication system for relatively high data bit rate RF communication overcomes multipath interference by employing relatively narrow beam antenna sectors and by selecting the best communication path established between two terminals (110, 120), at least one of which has narrow beam antenna sectors (1-6). The communication path selection process includes determining the signal integrity (380) of data communicated between the terminals. One implementation includes the narrow beam antenna sectors (16 & A-F) at each terminal.

    PROCESS FOR HAND-MADE PACKING
    87.
    发明专利
    PROCESS FOR HAND-MADE PACKING 未知

    公开(公告)号：HU908029D0

    公开(公告)日：1991-06-28

    申请号：HU802990

    申请日：1990-12-03

    Applicant: MOTOROLA INC

    Inventor： FREEBURG THOMAS A ,  KACZMARCZYK JOHN M ,  NOLAN MICHAEL P ,  BUCHHOLZ DALE R ,  WHITE RICHARD E ,  CHANG HUNGKUN J

    IPC: H04L12/54

    Abstract: In this invention a hierarchical addressing technique is employed in a packet communications system to enhance flexibility in handling packet information. This method permits packet message data (Fig. 3) and certain packet control data (Fig. 3) to be stored in memory locations (32, 34) without having to be duplicated at a different memory location prior to transmission of the packet. This method is preferably employed in a ring configuration in which a series of packets have addressing mechanisms which points sequentially to each other to form a ring of packets.

    90.
    发明专利
    未知

    公开(公告)号：FI891275A0

    公开(公告)日：1989-03-17

    申请号：FI891275

    申请日：1989-03-17

    Applicant: MOTOROLA INC

    Inventor： FREEBURG THOMAS A ,  DAUTEL DONALD F

    IPC: H04W76/04 ,  H04W88/02 ,  H04W88/16 ,  H04W92/02 ,  H04Q

    Abstract: A unique cellular data telephone system includes a cellular telephone system (CTS 150), a cellular data switch (CDS 170), and a telephone central office (130) for providing both voice and data telephone services to portable and mobile cellular data telephones (CDTs 102, 122) located anywhere in a large geographical area. Each of the CDTs (102, 122) includes a data control unit (DCU 106), a cellular modem (162) and a cellular telephone (108) and associated antenna (110), and connects to a data terminal (104, 124) with keyboard and display. DCU (106) includes memory (302) for storing a CDS telephone number and CDT telephone number, microcomputer (304) with internal memory for controlling data communications between cellular modem (162) and data terminal (104), a duel tone multifrequency ("DTMF") encode (306) for encoding telephone numbers and control signals, a DTMF decoder (314) for decoding DTMF telephone digits and/or DTMF control tones, a buffer (312) for storing transmit data from data terminal (104), and analog switches (308, 310) for coupling DTMF encoder (306) and buffer (312) to the transmit data Td signal to cellular modem (162). If data transmit (104) is inactive for a predetermined time interval, DCU (106) automatically disconnects the cellular telephone call while maintaining the landline telephone call to a data host (140, 141). Once data is transmitted again by data terminal (104), DCU (106) automatically places another cellular telephone call and is reconnected to the landline telephone call.

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