Patent ID: 6122260
Filing Date: 2000-09-19
Classification: H04B,H04W

Abstract:
A time division duplex (TDD) antenna array synchronous code division multiple access (S-CDMA) communications system for communicating message data to/from a plurality of terminals, comprising:a multichannel transceiver array comprising a plurality of antennas and a plurality of transceivers, wherein said multichannel transceiver array is adapted for receiving combinations of multichannel uplink S-CDMA signals from said terminals and transmitting multichannel downlink S-CDMA signals towards said terminals, wherein said multichannel transceiver array is adapted for receiving said combinations of multichannel uplink S-CDMA signals from said terminals and transmitting multichannel downlink S-CDMA signals towards said terminals during different time frames in a time division duplex manner;a spatial processor coupled to said multichannel transceiver array for determining spatial signature estimates associated with said terminals from said combinations of multichannel uplink S-CDMA signals, wherein said spatial processor is also operable to calculate uplink and downlink beamforming matrices based on the spatial signature estimates;a demodulator coupled to said spatial processor and said multichannel transceiver array for determining estimates of uplink messages from said terminals from said combinations of multichannel uplink S-CDMA signals; anda modulator coupled to said multichannel transceiver array for generating said multichannel downlink S-CDMA signals to transmit messages destined for said terminals.