Multiple-access hybrid OFDM-CDMA system

A method for wireless communication, comprising:

• spreading a modulation symbol with a spreading sequence to obtain a plurality of spread symbols;
• transforming the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• appending a cyclic prefix to the plurality of time-domain samples prior to transmission;
• and
• sending the plurality of time-domain samples via one or more antennas.

A method for wireless communication, comprising:

• spreading a modulation symbol with a spreading sequence to obtain a plurality of spread symbols;
• transforming the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• time division multiplexing the plurality of time-domain samples and a pilot;
• and
• sending the plurality of time-domain samples via one or more antennas.

A method for wireless communication, comprising:

• spreading a modulation symbol with a spreading sequence to obtain a plurality of spread symbols;
• transforming the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• scaling the plurality of time-domain samples, or the plurality of spread symbols, or the modulation symbol based on a gain to obtain a target transmit power level;
• and
• sending the plurality of time-domain samples via one or more antennas.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to spread a modulation symbol with a spreading sequence to obtain a plurality of spread symbols,
• code for causing the at least one processor to transform the plurality of spread symbols from frequency domain to time domain based on an inverse fast Fourier transform (IFFT) to obtain a plurality of time-domain samples, and
• code for causing the at least one processor to send the plurality of time-domain samples via one or more antennas.

A method for wireless communication, comprising:

• receiving a plurality of time-domain samples via one or more antennas;
• removing a cyclic prefix of the time-domain samples;
• transforming the plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission after removing the cyclic prefix;
• obtaining a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission;
• and
• despreading the plurality of received symbols based on a spreading sequence to obtain a despread symbol.

A method for wireless communication, comprising:

• receiving a plurality of time-domain samples via one or more antennas;
• transforming the plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission, wherein the transforming the plurality of time-domain samples comprises transforming the plurality of time-domain samples based on a fast Fourier transform (FFT) to obtain the received symbols for the subcarriers available for transmission;
• obtaining a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission;
• and
• despreading the plurality of received symbols based on a spreading sequence to obtain a despread symbol.

A method for wireless communication, comprising:

• receiving a plurality of time-domain samples via one or more antennas;
• time division demultiplexing the plurality of time-domain samples and a pilot;
• transforming the plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission;
• obtaining a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission;
• and
• despreading the plurality of received symbols based on a spreading sequence to obtain a despread symbol.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to remove a cyclic prefix prior to transforming a plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission,
• code for causing the at least one processor to obtain a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission, and
• code for causing the at least one processor to despread the plurality of received symbols based on a spreading sequence to obtain a despread symbol.

A method for wireless communication, comprising:

• generating modulation symbols comprising data multiplexed with control, wherein the generating comprises multiplexing power control commands with data;
• spreading the modulation symbols with a spreading sequence to obtain a plurality of spread symbols;
• transforming the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• and
• sending the plurality of time-domain samples via one or more antennas.

An apparatus for wireless communication, comprising:

• one or more antennas;
• at least one processor configured to generate modulation symbols comprising data multiplexed with control by multiplexing power control commands with data, spread the modulation symbols with a spreading sequence to obtain a plurality of spread symbols, transform the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• and
• a transmitter configured to send the plurality of time-domain samples via one or more antennas.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to generate modulation symbols comprising data multiplexed with control, wherein the code for causing at least one processor to generate comprises code for multiplexing power control commands with data;
• code for causing the at least one processor to spread the modulation symbols with a spreading sequence to obtain a plurality of spread symbols;
• code for the at least one processor to transform the plurality of spread symbols from frequency domain to time domain to obtain a plurality of time-domain samples;
• and
• code for causing the at least one processor to send the plurality of time-domain samples via one or more antennas.

A method for wireless communication, comprising:

• receiving a plurality of time-domain samples via one or more antennas, wherein the time-domain samples contain modulation symbols comprising data multiplexed with control, and wherein the received time-domain samples are power control commands multiplexed with data;
• transforming the plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission;
• obtaining a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission;
• and
• despreading the plurality of received symbols based on a spreading sequence to obtain a despread symbol.

A computer program product, comprising:

• a non-transitory computer-readable medium comprising:
• code for causing at least one processor to receive a plurality of time-domain samples via one or more antennas, wherein the time-domain samples contain modulation symbols comprising data multiplexed with control, and wherein the received time-domain samples are power control commands multiplexed with data;
• code for causing the at least one processor to transform the plurality of time-domain samples from time domain to frequency domain to obtain received symbols for subcarriers available for transmission;
• code for causing the at least one processor to obtain a plurality of received symbols for a plurality of subcarriers corresponding to a subset of the subcarriers available for transmission;
• and
• code for causing the at least one processor to despread the plurality of received symbols based on a spreading sequence to obtain a despread symbol.