Motorola

About: Motorola is a company organization based out in Schaumburg, Illinois, United States. It is known for research contribution in the topics: Signal & Communications system. The organization has 27298 authors who have published 38274 publications receiving 968710 citations. The organization is also known as: Motorola, Inc. & Galvin Manufacturing Corporation.

Methods and apparatus for transmitting data between different peer-to-peer communication groups

Abstract: Methods and apparatus for transmitting data between different peer-to-peer communication groups (104) are disclosed. A wireless device (102) determines (702) if it is simultaneously connected to a plurality of peer-to-peer communication groups (104) and instantiates (704) a bridge interface (404) at the wireless device (102) for communications between each peer-to-peer communication group (104). The wireless device (102) also determines (706) if it is simultaneously connected to at least one peer-to-peer communication device (102) and an access point (202). In such an instance, the wireless device (102) determines (708) if the access point (202) also includes a bridge interface (412). If the access point (202) does not include a bridge interface, the wireless device (102) runs (710) the bridge interface (404) at the wireless device (102) for communications between the at least one peer-to-peer communication device (102) and the access point (202). If the access point (202) does include a bridge interface (412), the wireless device (102) causes (712) the bridge interface (412) at the access point (202) to be instantiated for communications between the at least one peer-to-peer communication device (102) and the access point (202).

Magnetic element with improved field response and fabricating method thereof

Abstract: An improved and novel device and fabrication method for a magnetic element, and more particularly a magnetic element (10) including a first electrode (14), a second electrode (18) and a spacer layer (16). The first electrode (14) includes a fixed ferromagnetic layer (26). A second electrode (18) is included and comprises a free ferromagnetic layer (28). A spacer layer (16) is located between the fixed ferromagnetic layer (26) and the free ferromagnetic (28) layer, the spacer layer (16). At least one additional layer (20 & 22) is provided between the base metal layer (13) and the spacer layer (16). The base metal layer (13) or at least one of the layers positioned between the base metal layer (13) and the spacer layer (16) having an x-ray amorphous structure such that a reduced topological coupling strength between the free ferromagnetic layer (28) and the fixed ferromagnetic layer (26) is achieved.

Method and apparatus for assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radiotelephones in a cellular radiotelephone communications system

Abstract: A unique method and apparatus for efficiently assigning duplex radio channels and scanning duplex radio channels assigned to mobile and portable radiotelephones in a cellular communications system (Fig 1) Each cell (10, 20, 30) includes a base station radio (111, 121, 131) having a signalling channel and a plurality of voice channels, and a base site controller (112, 122, 132) adapted to utilize the methods embodying the present invention for controlling communications paths to mobile and portable radiotelephones The base station radios (Fig 2) include a signalling transceiver (250) operable on the signalling channel, a plurality of voice transceivers (220, 230) each operable on a voice channel, and a scanning receiver (240) for sampling the signal strength of active radiotelephones Transmitters of the signalling transceivers (250) and voice transceivers (220, 230) are combined (210) and coupled to an omnidirectional antenna (212); and the receivers of the signalling transceiver (250), voice transceivers (220, 230) and scanning receiver (240) are coupable to one or more of six sector antennas (214) In practicing the methods of the present invention, the microprocessor (358) controlled base site controller maintains high quality communications paths to mobile and portable radiotelephones by periodically monitoring their signal strength and when signal strength degradations are detected, either changing the base station sector antennas (214) coupled to voice transceivers (220, 230), increasing or decreasing radiotelephone power output, or handing radiotelephones off to another cell

A simple rate-equation-based thermal VCSEL model

Abstract: Motivated by the potentially large number of devices and simulations involved in optoelectronic system design, and the associated need for compact optoelectronic device models, we present a simple thermal model of vertical-cavity surface-emitting laser (VCSEL) light-current (LI) characteristics based on the laser rate equations and a thermal offset current. The model was implemented in conventional SPICE-like circuit simulators, including HSPICE, and used to simulate key features of VCSEL LI curves, namely, thermally dependent threshold current and output-power roll-over for a range of ambient temperatures. The use of the rate equations also allows simulation in other non-dc operating regimes. Our results compare favorably to experimental data from three devices reported in the literature.

Colocated cellular radiotelephone systems

Abstract: An existing cellular system (X-system 102) is interconnected with another cellular system (M-system 101) via inter-office trunks (150) to add additional switching capacity for providing telephone coverage to mobiles located throughout their common coverage area. X-system (102) includes a control terminal (120) coupled by data and voice lines to base sites (121-124) and by out trunks to a telephone central office (110). M-system (101) includes a control terminal (420) coupled by data and voice lines to base sites (411-415) and by in trunks and out trunks to the telephone central office (110). M-system base sites (411-414) are colocated with corresponding existing X-system base sites (121-124). Paging/access channels are assigned to M-system base sites (411-414) for processing all incoming originations from mobiles and paging mobiles for all outgoing originations. Access-only channels are assigned to X-system base sites (121-124) for processing mobile originations transferred to X-system (102) by a directed retry message from M-system (101). M-system (101) shares the mobile origination traffic with X-system (102) by sending a directed retry message to a percentage of the originating mobiles.