US 4,672,658 A · Spread spectrum wireless PBX

Abstract

The present invention relates to a wireless PBX network wherein direct sequence spread spectrum multiple access is used for voice and data communications to support a plurality of local-local and local-external calls. The present wireless PBX arrangement comprises a plurality of local user transceivers using a first separate unique chip sequence patterns for information communication and a second common chip sequence pattern for call-set up; and a central PBX comprising (a) a plurality of PBX transceivers, each of which uses a separate first chip sequence pattern which is matched to a corresponding local user transceiver; (b) a switching means for interconnecting local users to each other or to an external network via the associated PBX transceivers; and (c) a call set-up receiver responsive solely to initial call set-up information sent by any user using the second common chip sequence pattern. Optional selection diversity or equal gain combining diversity and/or error correction encoding may also be included in the transceivers.

Claims23

Dependent claims

A wireless local communication system comprising:

a plurality of separate local user transceivers, each local user transceiver comprising a transmitter and a receiver for respectively transmitting and receiving uniquely encoded direct sequence spread spectrum radio signals;
and
a central Private Branch Exchange (PBX) comprising
a plurality of PBX transceivers, each PBX transceiver (a) being matched to a separate one of the plurality of local user transceivers to provide a separate matched pair of a local user/PBX transceiver and (b) including a separate transmitter and receiver, each transceiver of a matched pair of transceivers solely transmitting to and receiving from its matched transceiver direct sequence spread spectrum radio signals which are encoded in a manner unique to said matched pair of transceivers while substantially rejecting transmissions from any non-matched transceiver, and
a switching means for interconnecting any one of the plurality of PBX transceivers to any other one of the plurality of PBX transceivers and/or to an external communication network, said switching means being capable of supporting a plurality of simultaneous PBX transceiver-PBX transceiver and PBX transceiver-external network interconnections.

2 more elements

A Central Private Branch Exchange (PBX) for use in a wireless local communication system comprising:

a plurality of PBX transceivers, each PBX transceivers including a seperate transmitter and receiver and receiver which are each arranged to transmit to, and receive from, a separate matched remote local user transceiver direct-sequence spread-spectrum radio, signals which are encoded in a manner unique to a matched pair of local user/PBX transceivers, while substanially rejecting transmissions from any other non-matched remote local user transceiver, and
a switching means for interconnecting any one of the plurality of PBX transceivers to any other one of the plurality of PBX transceivers and/or to an external communications network, said switching means being capable of supporting a plurality of simultaneous PBX transceiver-PBX transceiver and PBX transceiver-external network connections.

A transceiver for use in a wireless communication system, the transceiver comprising:

a transmitter including means for encoding an input digital bit stream into a unique direct-sequence spread-spectrum radio signal using a unique spread-spectrum chip sequence for subsequent transmission of the unique direct-sequence spread-spectrum radio signal to a receiver of another remote transceiver, and means responsive to call set-up control information including an origination and destination address for transmitting the call set-up control information in a direct-sequence spread-spectrum signal using a second unique spread-spectrum chip sequence;
and
a receiver for receiving uniquely encoded direct-sequence spread-spectrum raiio signals from ome or more remote transceivers, the receiver including means for decoding a direct-sequence spread-spectrum signal received from one of said one or more transceivers into a recovered digital bit stream using the unique spread-spectrum chip sequence used by the transmitter of the one of said one or more transceivers while substanially rejecting transmissions from any other transceiver.

Dependencies are inferred from the claim text.

Spread spectrum wireless PBX

Life of this patent

Spread spectrum wireless PBX

Life of this patent

Abstract

Claims23