-
公开(公告)号：DE68924187T2
公开(公告)日：1996-05-02
申请号：DE68924187
申请日：1989-01-30
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , DAUTEL DONALD F
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.
-
公开(公告)号：DE68922536T2
公开(公告)日：1996-01-18
申请号：DE68922536
申请日：1989-07-27
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
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.
-
公开(公告)号：CA2163559A1
公开(公告)日：1995-10-12
申请号：CA2163559
申请日：1995-02-06
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , JACKSON IRVIN RILEY , LEY JOHN
-
公开(公告)号：HU210890B
公开(公告)日：1995-09-28
申请号：HU326590
申请日：1990-05-30
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a scheme for bit error rate detection. It is characterised by: detecting the bit value present in a received multi-level signal (102), more narrowly detecting the bit value present in that received multi-level signal (104), comparing the results of narrow detection with the results detected otherwise to identify errors in detection (203, 206, 207 and 209), and accumulating detected symbol errors over unit time. Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds (213) a certain error threshold.
-
公开(公告)号：AU659582B2
公开(公告)日：1995-05-18
申请号：AU6751594
申请日：1994-07-18
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overcome interference and maintaining subscriber transmissions to terrestrial networks at power levels about one order of magnitude of the below co-channel transmissions to satellite networks to avoid causing interference at the satellite. Such power level maintenance is provided by the network in communication with such subscriber. Moreover, a non-orbiting ("grounded") satellite cooperates as a switching node of both the satellite network and a terrestrial network to relay information between a terrestrial subscriber and the satellite radiotelephone network over a terrestrial network. The terrestrial network and the satellite network may communicate via either the inter-satellite spectrum or the terrestrial-to-satellite spectrum.
-
Patent Agency Ranking
公开(公告)号：CA2055450C
公开(公告)日：1995-01-17
申请号：CA2055450
申请日：1990-04-23
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a scheme for bit error rate detection. It comprises: detecting the bit value present in a received multi-level signal, more narrowly detecting the bit value present in that received multi-level signal (Figure 1), comparing the results of narrow detection with the results detected otherwise to identify errors in detection, and accumulating detected symbol errors over unit time (Figure 2). Bit error rate detection can be used for antenna selection-selecting one of a plurality of diversity antennas when the error rate exceeds a certain error threshold.
-
公开(公告)号：BR9205487A
公开(公告)日：1994-06-21
申请号：BR9205487
申请日：1992-01-27
Applicant: MOTOROLA INC
Inventor： KACZMARCZYK JOHN M , BUCHHOLZ DALE R , FREEBURG THOMAS A , O'BRIEN RITA , WHITE RICHARD E
Abstract: A common communication controller (17) is linked to a plurality of peripheral devices (28) by a network interface bus (26). Packets containing information is communicated between the controller and the peripherals over the bus which consists of a parallel packet bus and a plurality of control lines utilized to implement a communication protocol which increases the efficiencies of packet communications by the utilization of additional direct command lines between the communications controller (17) and peripherals (28).
-
公开(公告)号：CA1327836C
公开(公告)日：1994-03-15
申请号：CA600623
申请日：1989-05-25
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
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, at least one of which has narrow beam antenna sectors. The communication path selection process includes determining the signal integrity of data communication between the terminals. One implementation includes the narrow beam antenna sectors at each terminal.
-
公开(公告)号：MX172698B
公开(公告)日：1994-01-07
申请号：MX2223790
申请日：1990-09-05
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A , WHITE RICHARD E , BUCHHOLZ DALE R , JOHANSON LISA B
Abstract: A network interface architecture for a packet/fast packet switch is described. This architecture provides for the combination of both voice and data in a single switch using a common packet structure. It allows for the dynamic allocation of bandwidth based on system loading. This includes not only bandwidth within the voice or data areas of the frame, but also between the voice and data portions. The network interface (105) provides a means (101) of passing all packets through the Network Interface (105) or allowing the packet devices to directly transfer packets between one another. The bandwidth allocation can easily be changed because the control and data memories are synchronized to one another. The architecture allows for the data packets and the control of bandwidth allocation to be controlled by a single switching device. It synchronizes the transfer of the data and the allocation of bus bandwidth. The control of the packet devices can be controlled at a very high bit rate such as 40 Mbps. It allows packet devices to directly transfer packets. It allows for easy re-allocation of bandwidth through the use of the NI Base Registers.
-
公开(公告)号：HUT63280A
公开(公告)日：1993-07-28
申请号：HU284492
申请日：1991-03-01
Applicant: MOTOROLA INC
Inventor： FREEBURG THOMAS A
Abstract: There is provided a mechanism for networking satellite and terrestrial networks. It comprises: maintaining subscriber-received power levels of terrestrial network transmissions about one order of magnitude above co-channel satellite transmissions to overcome interference and maintaining subscriber transmissions to terrestrial networks at power levels about one order of magnitude of the below co-channel transmissions to satellite networks to avoid causing interference at the satellite. Such power level maintenance is provided by the network in communication with such subscriber. Moreover, a non-orbiting ("grounded") satellite cooperates as a switching node of both the satellite network and a terrestrial network to relay information between a terrestrial subscriber and the satellite radiotelephone network over a terrestrial network. The terrestrial network and the satellite network may communicate via either the inter-satellite spectrum or the terrestrial-to-satellite spectrum.
-
-
-
-
-
-
-
-
-
Search Results
165
records
(took 0.058 seconds)
