Patent ID: 6980527
Filing Date: 2005-12-27
Classification: H04B,H04W,Y02D

Abstract:
1. 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, wherein the demodulator uses the uplink beamforming matrices in determining the estimates of the uplink messages from the terminals; and a modulator coupled to said spatial processor and said multichannel transceiver array for generating said multichannel downlink S-CDMA signals to transmit messages destined for said terminals, wherein the modulator uses the downlink beamforming matrices for generating the multichannel downlink S-CDMA signals to transmit the messages destined for the terminals.