Steering diversity for an OFDM-based multi-antenna communication system

A method of transmitting data in a wireless communication system, comprising:

• performing an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors, and
• repeating a portion of the plurality of time-domain samples to obtain an input sequence of time-domain samples;
• delaying the input sequence of time-domain samples by different amounts to generate a plurality of output sequences of time-domain samples for a plurality of antennas, wherein each different amount is associated with a different steering vector of the plurality of steering vectors;
• and
• transmitting the plurality of output sequences from the plurality of antennas starting at different times.

An apparatus in a wireless communication system, comprising:

• a modulator to process data to obtain an input sequence of time-domain samples, wherein the modulator performs an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples and further repeats a portion of the plurality of time-domain samples to obtain the input sequence of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors;
• a processor to generate a plurality of output sequences of time-domain samples for a plurality of antennas by temporally modifying the input sequence of time-domain samples, wherein the processor delays the input sequence by different sample period amounts to generate the plurality of output sequences, wherein each different sample period amount is associated with a different steering vector of the plurality of steering vectors;
• and
• a plurality of transmitter units to transmit the plurality of output sequences from the plurality of antennas.

An apparatus in a wireless communication system, comprising:

• means for processing data to obtain an input sequence of time-domain samples, wherein the means for processing the data comprises
• means for performing an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors;
• means for repeating a portion of the plurality of time-domain samples to obtain the input sequence of time-domain samples;
• means for generating a plurality of output sequences of time-domain samples for a plurality of antennas by temporally modifying the input sequence of time-domain samples, wherein the means for generating the plurality of output sequences of time-domain samples comprises:
• means for delaying the input sequence by different sample period amounts to generate the plurality of output sequences, wherein each different sample period amount is associated with a different steering vector of the plurality of steering vectors;
• and means for transmitting the plurality of output sequences from the plurality of antennas.

An apparatus in a wireless communication system, comprising:

• means for processing data to obtain an input sequence of time-domain samples, wherein the means for processing the data comprises
• means for performing an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors, and
• means for repeating a portion of the plurality of time-domain samples to obtain the input sequence of time-domain samples;
• means for generating a plurality of output sequences of time-domain samples for a plurality of antennas by temporally modifying the input sequence of time-domain samples, wherein the means for generating the plurality of output sequences of time-domain samples comprises:
• means for delaying the input sequence by different amounts to generate the plurality of output sequences, wherein each different amount is associated with a different steering vector of the plurality of steering vectors;
• and
• means for transmitting the plurality of output sequences from the plurality of antennas starting at different times.

A computer-program apparatus for processing data for transmission in a wireless communication system comprising a memory unit having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

• instructions for processing data to obtain an input sequence of time-domain samples, wherein the computer-executable instructions for processing the data comprise:
• instructions for performing an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors, and
• instructions for repeating a portion of the plurality of time-domain samples to obtain the input sequence of time-domain samples;
• instructions for generating a plurality of output sequences of time-domain samples for a plurality of antennas by temporally modifying the input sequence of time-domain samples, wherein the computer-executable instructions for generating the plurality of output sequences of time-domain samples comprise
• instructions for delaying the input sequence by different sample period amounts to generate the plurality of output sequences, wherein each different sample period amount is associated with a different steering vector of the plurality of steering vectors;
• and instructions for transmitting the plurality of output sequences from the plurality of antennas.

A computer-program apparatus for processing data for transmission in a wireless communication system comprising a memory unit having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:

• instructions for processing data to obtain an input sequence of time-domain samples, wherein the computer-executable instructions for processing the data comprise:
• instructions for performing an inverse discrete Fourier transform on a plurality of input symbols for a plurality of frequency subbands to obtain a plurality of time-domain samples, wherein each frequency subband is associated with a different steering vector of a plurality of steering vectors, and
• instructions for repeating a portion of the plurality of time-domain samples to obtain the input sequence of time-domain samples;
• instructions for generating a plurality of output sequences of time-domain samples for a plurality of antennas by temporally modifying the input sequence of time-domain samples, wherein the computer-executable instructions for generating the plurality of output sequences of time-domain samples comprise
• instructions for delaying the input sequence by different amounts to generate the plurality of output sequences, wherein each different amount is associated with a different steering vector of the plurality of steering vectors;
• and
• instructions for transmitting the plurality of output sequences from the plurality of antennas starting at different times.