Multi-access hybrid ofdm-cdma system

An apparatus for processing data for transmission over a wireless communication channel in a multiple-access OFDM-CDMA system, comprising:

• means for coding a data stream in accordance with a particular coding scheme to provide a stream of data symbols;
• means for spreading the data symbol stream in a frequency domain with one or more spreading codes to provide spread data, wherein the one or more spreading codes are selected from a set of available spreading codes and assigned to the data stream;
• means for transforming the spread data in accordance with an inverse Fourier transform to provide a stream of OFDM symbols;
• means for appending a cyclic prefix to each OFDM symbol to provide a corresponding transmission symbol;
• means for scaling each transmission symbol in accordance with a particular gain selected for the data stream, wherein the particular gain is based upon an estimated signal quality responsive to a power control command of a particular multiple access power control scheme;
• means for covering scaled transmission symbols with a cover code;
• and
• means for transmitting the covered transmission symbols over the communication channel.

An apparatus for processing data for transmission over a wireless communication channel, comprising:

• means for coding a data stream to provide a stream of data symbols;
• means for applying one or more spreading codes to the stream of data symbols in a frequency domain to provide spread data;
• means for generating a stream of OFDM symbols from the spread data;
• means for applying a gain to the stream of OFDM symbols based upon information regarding a communication channel over which at least some of the stream of OFDM symbols are to be transmitted, wherein the information regarding a communication channel comprises an estimated signal quality of symbols transmitted over the communication channel;
• and
• means for adjusting the spreading based on a data rate of the stream of data symbols.

A computer-program storage apparatus for processing data for transmission over a wireless communication channel in a multiple-access OFDM-CDMA system comprising a memory having one or more software modules stored thereon, the one or more software modules being executable by one or more processors and the one or more software modules comprising:

• code for coding a data stream in accordance with a particular coding scheme to provide a stream of data symbols;
• code for spreading the data symbol stream in a frequency domain with one or more spreading codes to provide spread data, wherein the one or more spreading codes are selected from a set of available spreading codes and assigned to the data stream;
• code for transforming the spread data in accordance with a particular transformation to provide a stream of OFDM symbols;
• code for scaling the stream of OFDM symbols in accordance with a particular gain selected for the data stream, wherein the particular gain is based upon an estimated signal quality;
• code for covering the scaled OFDM symbols with a cover code;
• and
• code for transmitting the covered OFDM symbols over the communication channel.

A computer-program storage apparatus for processing data for transmission over a wireless communication channel in a multiple-access OFDM-CDMA system comprising a memory having one or more software modules stored thereon, the one or more software modules being executable by one or more processors and the one or more software modules comprising:

• code for coding a data stream in accordance with a particular coding scheme to provide a stream of data symbols;
• code for spreading the data symbol stream in a frequency domain with one or more spreading codes to provide spread data, wherein the one or more spreading codes are selected from a set of available spreading codes and assigned to the data stream;
• code for transforming the spread data in accordance with an inverse Fourier transform to provide a stream of OFDM symbols;
• code for appending a cyclic prefix to each OFDM symbol to provide a corresponding transmission symbol;
• code for scaling each transmission symbol in accordance with a particular gain selected for the data stream, wherein the particular gain is based upon an estimated signal quality responsive to a power control command of a particular multiple access power control scheme;
• code for covering scaled transmission symbols with a cover code;
• and
• code for transmitting the covered transmission symbols over the communication channel.

A computer-program storage apparatus for processing data for transmission over a wireless communication channel comprising a memory having one or more software modules stored thereon, the one or more software modules being executable by one or more processors and the one or more software modules comprising:

• code for coding a data stream to provide a stream of data symbols;
• code for applying one or more spreading codes to the stream of data symbols in a frequency domain to provide spread data;
• code for generating a stream of OFDM symbols from the spread data;
• code for applying a gain to the stream of OFDM symbols based upon information regarding a communication channel over which at least some of the stream of OFDM symbols are to be transmitted, wherein the information regarding a communication channel comprises an estimated signal quality of symbols transmitted over the communication channel;
• and
• code for adjusting the spreading based on a data rate of the stream of data symbols.