US 6,128,330 A · Efficient shadow reduction antenna system for spread spectrum

An antenna system employing space diversity and coding, for transmitting data having symbols, over a communications channel having fading caused by multipath and shadowing, comprising:

a forward-error-correction (FEC) encoder for FEC encoding the data, thereby generating FEC data;
an interleaver, coupled to said FEC encoder, for interleaving the symbols of the FEC data, thereby generating interleaved data;
a demultiplexer coupled to said interleaver, for demultiplexing the interleaved data into a plurality of subchannels of data;
a plurality of spread-spectrum devices coupled to said demultiplexer, 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, coupled to said plurality of spread-spectrum devices, respectively, with each transmitter antenna of said plurality of transmit antennas spaced from other transmit antennas of said 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, coupled to the communications channel, 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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals;
a plurality of matched filters, coupled to said receiver antenna, having a plurality of impulse responses matched to the plurality of chip-sequence signals, respectively, 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, coupled to said plurality of matched filters, with a first RAKE and space-diversity combiner coupled to each matched filter having an impulse response matched to a first chip-sequence signal, and with respective RAKE and space-diversity combiners coupled to respective matched filters 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 matched filters, 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;
a multiplexer, coupled to said plurality of RAKE and space diversity combiners, for multiplexing the plurality of combined signals, thereby generating a multiplexed signal;
a de-interleaver, coupled to said multiplexer, for de-interleaving the multiplexed signal from said multiplexer, thereby generating a de-interleaved signal;
and
a decoder, coupled to said de-interleaver, for decoding the de-interleaved signal.

11 more elements

An antenna system for transmitting data having symbols, over a communications channel having fading, comprising:

a forward-error-correction (FEC) encoder for FEC encoding the data as FEC-encoded data;
an interleaver, coupled to said FEC encoder, for interleaving symbols of the FEC-encoded data as interleaved data;
a multiplicity of delay devices, coupled to said interleaver, for delaying, with respect to a first signal of a plurality of signals of the interleaved data, other signals of the plurality of signals of the interleaved data by at least a symbol, with each delay device of the multiplicity of delay devices having a delay different from other delay devices of the multiplicity of delay devices, thereby generating a plurality of time-channel signals;
a plurality of spread-spectrum devices, with a first spread-spectrum device of the plurality of spread-spectrum devices coupled to said interleaver, with other spread-spectrum devices of the plurality of spread-spectrum devices coupled to said multiplicity of delay devices, respectively, said plurality of spread-spectrum devices for spread-spectrum processing, with a chip-sequence signal, the first signal and the plurality of time-channel signals, as a plurality of spread-spectrum signals, respectively;
a plurality of transmit antennas, coupled to said plurality of spread-spectrum devices, respectively, with each transmitter antenna spaced from other transmit antennas of said plurality of transmit antennas, for radiating at a carrier frequency, using radio waves, the plurality of spread-spectrum signals, respectively, over said communications channel;
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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals from said communications channel, with each receiver subsystem of said plurality of receiver subsystems including a receiver antenna, coupled to the communications channel, for receiving the plurality of spread-spectrum signals, and a matched filter, coupled to said receiver antenna, having an impulse response matched to the chip-sequence signal, for detecting the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals as a detected spread-spectrum signal and a multiplicity of detected-fading spread-spectrum signals;
a RAKE and space-diversity combiner, coupled to each receiver subsystem of the plurality of receiver subsystems, for combining the detected spread-spectrum signal and the multiplicity of detected-fading spread-spectrum signals from each of said plurality of receiver subsystems, thereby generating a combined signal;
a de-interleaver, coupled to said RAKE and space diversity combiner, for de-interleaving the combined signal from said RAKE and space-diversity combiner, thereby generating a de-interleaved signal;
and
a FEC decoder, coupled to said de-interleaver, for decoding the de-interleaved signal as decoded data.

8 more elements

A method using an antenna system for transmitting data having symbols, over a communications channel having fading, comprising the steps of:

demultiplexing the data into a plurality of subchannels of data;
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;
radiating, from a plurality of transmit antennas, with each transmitter antenna spaced from other transmit antennas of said plurality of transmit antennas, at a carrier frequency, using radiowaves, the plurality of spread-spectrum-subchannel signals, respectively, as a plurality of spread-spectrum signals;
imparting, from the communications channel, fading on the plurality of spread-spectrum signals, thereby generating a multiplicity of fading spread-spectrum signals;
receiving the plurality of spread-spectrum signals with a plurality of receiver antennas;
detecting, at each receiver antenna of the plurality of receiver antennas, 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;
combining, from each receiver antenna of the plurality of receiver antennas, for each respective chip-sequence signal, the plurality of detected spread-spectrum signals and the multiplicity of detected-fading spread-spectrum signals, thereby generating a plurality of combined signals, with a first combined signal from detected spread-spectrum signals in the plurality of detected spread-spectrum signals and detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a first chip-sequence signal, and with respective combined signals from respective detected spread-spectrum signals in the plurality of detected spread-spectrum signals and respective detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a respective chip-sequence signal;
and
multiplexing the plurality of combined signals, thereby generating a multiplexed signal.

6 more elements

An antenna system employing space diversity and coding, for transmitting data having symbols, over a communications channel having fading, comprising:

forward-error-correction (FEC) means for FEC encoding the data, thereby generating FEC data;
interleaver means, coupled to said FEC means, for interleaving the symbols of the FEC data, thereby generating interleaved data;
demultiplexer means, coupled to said FEC means, for demultiplexing the interleaved data into a plurality of subchannels of data;
spread-spectrum means, coupled to said demultiplexer means, 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 coupled to said spread-spectrum means, respectively, with each transmitter antenna spaced from other transmit antennas of said 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 coupled to the communications channel, 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,
receiver-antenna means, coupled to the communications channel, for receiving the plurality of spread-spectrum signals;
matched-filter means, coupled to said receiver-antenna means, having a plurality of impulse responses matched to the plurality of chip-sequence signals, respectively, 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;
RAKE and space-diversity means, coupled to said matched-filter means, for combining, for each respective chip-sequence signal, the plurality of detected spread-spectrum signals and the multiplicity of detected-fading spread-spectrum signals from said plurality of receiver subsystems, thereby generating a plurality of combined signals, with a first combined signal from detected spread-spectrum signals in the plurality of detected spread-spectrum signals and detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a first chip-sequence signal, and with respective combined signals from respective detected spread-spectrum signals in the plurality of detected spread-spectrum signals and respective detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a respective chip-sequence signal;
multiplexer means, coupled to said RAKE and space-diversity means, for multiplexing the plurality of combined signals, thereby generating a multiplexed signal;
de-interleaver means, coupled to said RAKE and space-diversity means, for de-interleaving the multiplexed signal from said multiplexer, thereby generating a de-interleaved signal;
and
decoder means, coupled to said de-interleaver means, for decoding the de-interleaved signal.

11 more elements

An antenna system for transmitting data having symbols, over a communications channel having fading, comprising:

a multiplicity of delay devices for delaying, with respect to a first signal of a plurality of signals of interleaved-FEC data, other signals of the plurality of signals of the interleaved-FEC data by at least a symbol, with each delay device of the multiplicity of delay devices having a delay different from other delay devices of the multiplicity of delay devices, thereby generating a plurality of time-channel signals;
a plurality of spread-spectrum devices, with a first spread-spectrum device of the plurality of spread-spectrum devices coupled to an input, with other spread-spectrum devices of the plurality of spread-spectrum devices coupled to said multiplicity of delay devices, respectively, said plurality of spread-spectrum devices for spread-spectrum processing, with a chip-sequence signal, the first signal and the plurality of time-channel signals, as a plurality of spread-spectrum signals, respectively;
a plurality of transmit antennas, coupled to said plurality of spread-spectrum devices, respectively, for radiating at a carrier frequency, using radio waves, the plurality of spread-spectrum signals, respectively, over the communications channel;
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, coupled to the communications channel, 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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals, and a matched filter, coupled to said receiver antenna, having an impulse response matched to the chip-sequence signal, for detecting the spread-spectrum signal and the multiplicity of fading spread-spectrum signals as a detected spread-spectrum signal and a multiplicity of detected-fading spread-spectrum signals;
and
a RAKE and space-diversity combiner, coupled to each receiver subsystem of the plurality of receiver subsystems, for combining the detected spread-spectrum signal and the multiplicity of detected-fading spread-spectrum signals from each of said plurality of receiver subsystems, thereby generating a plurality of combined signals.

4 more elements

A system for transmitting data having symbols over a communications channel having fading, comprising:

a demultiplexer for demultiplexing the data into a plurality of subchannels of data;
spread-spectrum device 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, with each transmitter antenna spaced from other transmit antennas of said plurality of transmit antennas, for radiating at a carrier frequency, using radiowaves, the plurality of spread-spectrum-subchannel signals, respectively, as a plurality of spread-spectrum signals;
said communications channel for imparting fading on the plurality of spread-spectrum signals, thereby generating a multiplicity of fading spread-spectrum signals;
a plurality of receiver antennas, with each receiver antenna of said plurality of receiver antennas for receiving the plurality of spread-spectrum signals;
a detector, at each receiver antenna of the plurality of receiver antennas, 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 combiner for combining, from each receiver antenna of the plurality of receiver antennas, for each respective chip-sequence signal, the plurality of detected spread-spectrum signals and the multiplicity of detected-fading spread-spectrum signals, thereby generating a plurality of combined signals, with a first combined signal from detected spread-spectrum signals in the plurality of detected spread-spectrum signals and detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a first chip-sequence signal, and with respective combined signals from respective detected spread-spectrum signals in the plurality of detected spread-spectrum signals and respective detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a respective chip-sequence signal;
and
a multiplexer for multiplexing the plurality of combined signals, thereby generating a multiplexed signal.

6 more elements

An antenna system employing space diversity and coding, for transmitting data having symbols, over a communications channel having fading, comprising:

a demultiplexer for demultiplexing the data into a plurality of subchannels of data;
a plurality of forward-error-correction (FEC) encoders for FEC encoding the plurality of subchannels of data, thereby generating a plurality of subchannels of FEC data;
a plurality of interleavers, coupled to said plurality of FEC encoders, for interleaving the symbols of the plurality of subchannels of FEC data, respectively, thereby generating a plurality of subchannels of interleaved data;
a plurality of spread-spectrum devices coupled to said plurality of interleavers, respectively, for spread-spectrum processing the plurality of subchannels of interleaved 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, coupled to said plurality of spread-spectrum devices, respectively, with each transmitter antenna of said plurality of transmit antennas spaced from other transmit antennas of said 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, coupled to the communications channel, 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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals;
a plurality of matched filters, coupled to said receiver antenna, having a plurality of impulse responses matched to the plurality of chip-sequence signals, respectively, 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, coupled to said plurality of matched filters, with a first RAKE and space-diversity combiner coupled to each matched filter having an impulse response matched to a first chip-sequence signal, and with respective RAKE and space-diversity combiners coupled to respective matched filters 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 matched filters, 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;
de-interleavel means for de-interleaving the plurality of combined signals;
decoder means for decoding the plurality of combined signals;
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.

12 more elements

An antenna system for transmitting data having symbols, over a communications channel having fading, comprising:

a multiplicity of delay devices, for delaying, with respect to a first signal of a plurality of signals, other signals of the plurality of signals by at least a symbol, with each delay device of the multiplicity of delay devices having a delay different from other delay devices of the multiplicity of delay devices, thereby generating a plurality of time-channel signals;
a plurality of spread-spectrum devices, with a first spread-spectrum device of the plurality of spread-spectrum devices for spread-spectrum processing the first signal of the plurality of signals as a first spread-spectrum channel in a plurality of spread-spectrum signals, with other spread-spectrum devices of the plurality of spread-spectrum devices coupled to said multiplicity of delay devices, respectively, with other spread-spectrum devices of said plurality of spread-spectrum devices for spread-spectrum processing, with the chip-sequence signal, the plurality of time-channel signals, as spread-spectsrum channels other than the first spread-spectrum channel in the plurality of spread-spectrum signals, respectively;
a plurality of transmit antennas, coupled to said plurality of spread-spectrum devices, respectively, with each transmitter antenna spaced from other transmit antennas of said plurality of transmit antennas, for radiating at a carrier frequency, using radio waves, the plurality of spread-spectrum signals, respectively, over said communications channel;
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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals from said communications channel, with each receiver subsystem of said plurality of receiver subsystems including a receiver antenna, coupled to the communications channel, for receiving the plurality of spread-spectrum signals, and a matched filter, coupled to said receiver antenna, having an impulse response matched to the chip-sequence signal, for detecting the plurality of spread-spectrum signals and the multiplicity of fading spread-spectrum signals as a detected spread-spectrum signal and a multiplicity of detected-fading spread-spectrum signals;
and
a RAKE and space-diversity combiner, coupled to each receiver subsystem of the plurality of receiver subsystems, for combining the detected spread-spectrum signal and the multiplicity of detected-fading spread-spectrum signals from each of said plurality of receiver subsystems, thereby generating a combined signal.

4 more elements

An antenna system, for transmitting data having symbols, over a communications channel having fading, comprising:

demultiplexer means for demultiplexing the data into a plurality of subchannels of data;
spread-spectrum means, coupled to said demultiplexer means, 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 coupled to said spread-spectrum means, respectively, with each transmitter antenna spaced from other transmit antennas of said 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 coupled to the communications channel, 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,
receiver-antenna means, coupled to the communications channel, for receiving the plurality of spread-spectrum signals;
matched-filter means, coupled to said receiver-antenna means, having a plurality of impulse responses matched to the plurality of chip-sequence signals, respectively, 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;
RAKE and space-diversity means, coupled to said matched-filter means, for combining, for each respective chip-sequence signal, the plurality of detected spread-spectrum signals and the multiplicity of detected-fading spread-spectrum signals from said plurality of receiver subsystems, thereby generating a plurality of combined signals, with a first combined signal from detected spread-spectrum signals in the plurality of detected spread-spectrum signals and detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a first chip-sequence signal, and with respective combined signals from respective detected spread-spectrum signals in the plurality of detected spread-spectrum signals and respective detected-fading spread-spectrum signals in the multiplicity of detected-fading spread-spectrum signals having an impulse response matched to a respective chip-sequence signal;
and
multiplexer means, coupled to said RAKE and space-diversity means, for multiplexing the plurality of combined signals, thereby generating a multiplexed signal.

7 more elements

An antenna system for transmitting data having symbols, over a communications channel having fading, comprising:

a multiplicity of delay devices for delaying, with respect to a first signal of a plurality of signals of interleaved-FEC data, other signals of the plurality of signals of the interleaved-FEC data by at least a symbol, with each delay device of the multiplicity of delay devices having a delay different from other delay devices of the multiplicity of delay devices, thereby generating a plurality of time-channel signals;
a plurality of spread-spectrum devices, with a first spread-spectrum device of the plurality of spread-spectrum devices coupled to an input, with other spread-spectrum devices of the plurality of spread-spectrum devices coupled to said multiplicity of delay devices, respectively, said plurality of spread-spectrum devices for spread-spectrum processing, with a chip-sequence signal, the first signal and the plurality of time-channel signals, as a plurality of spread-spectrum signals, respectively;
a plurality of transmit antennas, coupled to said plurality of spread-spectrum devices, respectively, for radiating at a carrier frequency, using radio waves, the plurality of spread-spectrum signals, respectively, over the communications channel;
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, coupled to the communications channel, 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, coupled to the communications channel, for receiving the plurality of spread-spectrum signals, and a matched filter, coupled to said receiver antenna, having an impulse response matched to the chip-sequence signal, for detecting the spread-spectrum signal and the multiplicity of fading spread-spectrum signals as a detected spread-spectrum signal and a multiplicity of detected-fading spread-spectrum signals;
and
a RAKE and space-diversity combiner, coupled to each receiver subsystem of the plurality of receiver subsystems, for combining the detected spread-spectrum signal and the multiplicity of detected-fading spread-spectrum signals from each of said plurality of receiver subsystems, thereby generating a plurality of combined signals.

4 more elements

Efficient shadow reduction antenna system for spread spectrum

Life of this patent

Efficient shadow reduction antenna system for spread spectrum

Life of this patent

Abstract

Claims13