California Institute of Technology

Tsun-Yee Yan

Charles C Wang

Marvin K Simon

Andrew A Gray

William Rafferty

Unjeng Cheng

Payman Arabshahi

Clayton M Okino

Dennis K Lee

Khaled I Dessouky

A reconfigurable architecture for wireless digital data and voice communications is provided for ad hoc and/or an ad hoc collection of organized networks. At least some user wireless communication units serve as relay stations for other users units, enabling any user within the range of another, participating user to gain access to the local- and wider-area networks in a multihop process. Reconfigurable hardware enables dynamic protocol 'preferencing', and easy upgrades to potential future wireless protocol standards. Power-efficient communication takes place by using multihop radio communication at the local level and high-speed point-to-point links (e.g. fiber, satellite) at the global level. Microcells within a network community are aggregated into cells by use of a local-area-network (LAN) backbone of higher speed wireless and/or wired connections. Every time a microcell connects to the wireless backbone, microcells or individual users in surrounding blocks can also connect to the network.

Reconfigurable protocols and architectures for wireless networks

An FQPSK-B receiver uses a simplified trellis system which uses combinations of FQPSK-B waveforms to correlate against an input signal. This enables reduction of the number of correlators that are used and the number of comparisons that are made by the correlators.

FQPSK-B viterbi receiver

A satellite communications system includes an orbiting communications satellite for relaying communications to and from a plurality of ground stations, and a network management center for making connections via the satellite between the ground stations in response to connection requests received via the satellite from the ground stations, the network management center being configured to provide both open-end service and closed-end service. The network management center of one embodiment is configured to provides both types of service according to a predefined channel access protocol that enables the ground stations to request the type of service desired. The channel access protocol may be configured to adaptively allocate channels to open-end service and closed-end service according to changes in the traffic pattern and include a free-access tree algorithm that coordinates collision resolution among the ground stations.

Land-mobile satellite communication system

Growing community of inventors

Northridge, CA, United States of America

Tsun-Yee Yan