Wireless multiple access system for suppressing inter-cell interference

A method of transmitting data using orthogonal frequency division multiplexing (OFDM) in a wireless communication system, the method comprising:

• converting an input signal to a plurality of sub-channel signals;
• converting the plurality of sub-channel signals to signals by performing inverse fourier transform;
• and
• multiplying at least one of the signals with an element of a scrambling code to provide substantially orthogonal outputs in time domain, wherein the scrambling code is used for differentiating signals transmitted in neighboring cells.

An apparatus for transmitting data using orthogonal frequency division multiplexing (OFDM) in a wireless communication system, the apparatus comprising:

• a serial-to-parallel converter to convert an input signal to a plurality of sub-channel signals;
• a processing unit operatively connected to the serial-to-parallel converter to multiply at least one of the plurality of sub-channel signals with an element of a scrambling code to provide substantially orthogonal outputs in at least one of time and frequency domains, wherein the scrambling code is used for differentiating signals transmitted in neighboring cells;
• and
• a transform unit operatively connected to the processing unit to convert the substantially orthogonal outputs to signals by performing inverse fourier transform.

An apparatus for transmitting data using orthogonal frequency division multiplexing (OFDM) in a wireless communication system, the apparatus comprising:

• a serial-to-parallel converter to convert an input signal to a plurality of sub-channel signals;
• a transform unit operatively connected to the serial-to-parallel converter to convert the plurality of sub-channel signals to signals by performing inverse fourier transform;
• and
• a processor operatively connected to the transform unit to multiply at least one of the signals with an element of a scrambling code to provide substantially orthogonal outputs in time domain, wherein the scrambling code is used for differentiating signals transmitted in neighboring cells.