Wireless local area network

Details Wireless local area network Wireless local area network

H - Electricity

04

K

354/231, 325/3

H04K 1/00 (2006.01) H04L 12/28 (2006.01)

Patent

CA 1290020

INVENTION: WIRELESS LOCAL AREA NETWORK ABSTRACT OF THE DISCLOSURE A local area network permits wireless transfer of digitized data among data processing machines in the interior of a building. The network includes a base station which may be associated with shared network resources such as a host computer, print servers and file servers, and local stations each associated with a data processing machine such as a dumb terminal. The base station polls each local stations to initiate data transmission to the base station. All data is transmitted as temporally spaced-apart packets,spread spectrum modulated according to a common pseudo-random noise code and encoded onto a common RF carrier. The transmitted data packets include a synchronization code which permits proper spread spectrum decoding without loss of relevant data. The base station uses one of three spaced-apart antennas for transmission of data to each local station and records for each station the antenna last used. If excessive transmission errors occur to and from any local station, the base station selects a differentantenna for further transmission and updates its recorded antenna information. Accordingly, when RF obstructions occur, the base station hunts for an alternative transmission path to maintain communications with a local station.

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