Patent ID: 6539028
Filing Date: 2003-03-25
Classification: H04B,H04L,H04W

Abstract:
A wireless carrier sense multiple access/collision detection (CSMA/CD) communication system comprising:a repeater station; at least one terminal station; a wireless uplink communication channel for one-way communications between each said terminal station and said repeater station; a wireless downlink communication channel for one-way communication between each said repeater station and each said terminal station, said uplink and downlink communication channels being operable at different transmission wavelengths, wherein a bit pattern received by said repeater station via said uplink channel is retransmitted via said downlink channel; and a collision detection arrangement within each said terminal station having means for introducing a delay in the transmission bit pattern by a predetermined period to correspond with an anticipated reception of a re-transmitted bit pattern emitted from said repeater station, and comparison means for comparing a delayed bit pattern, on a bit-by-bit basis, with a received bit pattern to determine if said terminal station has unambiguous access to communications within said system.