Patent ID: 6466610
Filing Date: 2002-10-15
Classification: H04B,H04J

Abstract:
An improvement to an antenna system employing space diversity and coding, for transmitting data having symbols, over a communications channel having fading, the improvement comprising:a demultiplexer for demultiplexing data into a plurality of subchannels of data; a plurality of spread-spectrum devices for spread-spectrum processing the plurality of subchannels of data with a plurality of chip-sequence signals, respectively, with each chip-sequence signal different from other chip-sequence signals in the plurality of chip-sequence signals, thereby generating a plurality of spread-spectrum-subchannel signals, respectively; a plurality of transmit antennas for radiating at a carrier frequency, using radiowaves, the plurality of spread-spectrum-subchannel signals, respectively, over the communications channel, as a plurality of spread-spectrum signals; said communications channel imparting fading on the plurality of spread-spectrum signals, thereby generating a multiplicity of fading spread-spectrum signals; a plurality of receiver subsystems for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals from the communications channel, with each receiver subsystem of said plurality of receiver subsystems including, a receiver antenna for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals; a plurality of despreaders, for detecting the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals, as a plurality of detected spread-spectrum signals and a multiplicity of detected-fading spread-spectrum signals, respectively; a plurality of RAKE and space-diversity combiners, with a first RAKE and space-diversity combiner coupled to each despreader having an impulse response matched to a first chip-sequence signal, and with respective RAKE and space-diversity combiners coupled to respective despreaders having impulse responses matched to respective chip-sequence signals, for combining, for a respective chip-sequence signal, the plurality of detected spread-spectrum signals and the multiplicity of detected-fading spread-spectrum signals from said plurality of despreaders, thereby generating a plurality of combined signals and a plurality of signal amplitudes, respectively, with a first combined signal from the first RAKE and space-diversity combiner, and with respective combined signals from respective RAKE and space-diversity combiners; and a multiplexer, coupled to said plurality of RAKE and space diversity combiners, for multiplexing the plurality of combined signals, thereby generating a multiplexed signal.