Radio communication system, radio communication method, and transmitter apparatus and receiver apparatus suitable for use in the same

A radio communication method for performing radio communication by combining the OFDM modulation method and the CDMA modulation method, the method comprising the steps of:

• estimating conditions of propagation paths used in the radio communication, arranging information symbols along the direction of the frequency axis in accordance with a predetermined pattern based on the estimated conditions of propagation paths, and transmitting a radio communication signal including the arranged information symbols, in a transmitter apparatus;
• and
• receiving the radio communication signal, and rearranging the information symbol included in the radio communication signal along the direction of the frequency axis in accordance with a reverse pattern to the predetermined pattern, in a receiver apparatus.

A transmitter apparatus used in a radio communication system for performing radio communication by combining the OFDM modulation method and the CDMA modulation method, wherein

• the transmitter apparatus estimates conditions of propagation paths used in the radio communication, arranges information symbols along the direction of the frequency axis in accordance with a predetermined pattern based on the estimated conditions of propagation paths, and transmits a radio communication signal including the arranged information symbols.

A receiver apparatus used in a radio communication system for performing radio communication by combining the OFDM modulation method and the CDMA modulation method, wherein

• the receiver apparatus configured to receive a radio communication signal from a transmitter, and rearrange information symbol included in the radio communication signal along the direction of the frequency axis in accordance with a reverse pattern to a predetermined pattern;
• and
• a transmitter apparatus estimates conditions of propagation paths used in the radio communication, arranges the information symbols along the direction of the frequency axis in accordance with the predetermined pattern based on the estimated conditions of propagation paths, and transmits the radio communication signal including the arranged information symbols.