Radio communication system and transmitting apparatus used for the same

A transmitting apparatus that generates a first spread spectrum signal formed of M sub-carriers by performing a spread spectrum of a time-domain information signal and transmits the spread spectrum transmitting signal by allocating the spread spectrum transmitting signal to any one of a plurality of contiguous frequency channels defined in a constant frequency band formed of a plurality of sub-carriers and to any one of a plurality of time channels defined as having a constant time length,

• wherein
• when the number of sub-carriers constituting one of the frequency channels is N which is smaller than M, in order to allocate the transmitting signal to the frequency channel, the transmitting apparatus deletes part of the first spread spectrum signal by (M−N) sub-carriers to generate a second spread spectrum signal and transmits the second spread spectrum signal by allocating the second spread spectrum signal to the frequency channel.

The receiving apparatus that receives a signal transmitted from a transmitting apparatus that generates a first spread spectrum signal formed of M sub-carriers by performing a spread spectrum of a time-domain information signal, transmits the spread spectrum transmitting signal by allocating the spread spectrum transmitting signal to a frequency channel formed of N sub-carriers which is smaller than M, wherein

• the receiving apparatus, based on the received signal in the frequency channel formed of the N sub-carriers, performs a reproducing process of the information signal to be noticed by the first spread spectrum signal formed of the M sub-carriers.