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- Patents > 2007-12-06 > SECTION H ELECTRICITY > ELECTRIC COMMUNICATION TECHNIQUE > SECRET COMMUNICATION; JAMMING OF COMMUNICATION
Transmitter and transmission method
A transmitter includes a time/frequency-domain converter that converts a time-domain data signal to a frequency-domain data signal of a fixed number; a subcarrier allocator that allocates the obtained frequency-domain data signal to any of subcarriers, the number of which exceeds the fixed number, the subcarriers being allocated in a predetermined transmission frequency band; and a controller that controls the subcarrier allocator to allocate signals other than the data signal to subcarriers in an idle band to which the data signal is not allocated. By this, without the need for a plurality of time/frequency-domain conversion circuits with a large size, such as DFTs, frequency utilization efficiency (data transmission efficiency) is improved.
Filed on: 2006-10-31; Application Number: 11589951