Patent ID: 7272162

Claim:
A transmitter for a spread-spectrum communication system in which transmission data is subject to spectrum spreading using a predetermined number of subcarriers, the transmitter comprising: a frame generation unit configured to construct a frame by inserting a predetermined pilot sequence in the transmission data; a data hopping unit including 1) a hopping pattern generating unit including at least one multiplier and configured to generate a hopping pattern of a predetermined sequence length and switched at a predetermined hopping frequency, the hopping pattern designating a subcarrier for frequency hopping, and 2) a data selection unit configured to output a plurality of subcarrier transmission signals corresponding to the plurality of subcarriers, respectively, by receiving the transmission data and outputting as a subcarrier transmission signal only the transmission data carried in a subcarrier designated by the hopping pattern, while maintaining the other subcarrier transmission signals at a zero output level; and an inverse Fourier transform unit configured to subject the entirety of subcarrier transmission signals output from said data selection unit to inverse Fourier transform so as to output frequency-hopped spread-spectrum transmission signals.