Transmitter and transmission method
AssigneeFujitsu Limited
InventorHiroyuki Seki
Life of this patent
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Abstract
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.
Claims16
A transmitter comprising:
- a time/frequency-domain conversion unit which converts a time-domain data signal to a frequency-domain data signal of a predetermined number;
- a subcarrier allocation unit which allocates means for allocating the frequency-domain data signal obtained by the time/frequency-domain conversion unit to any of subcarriers, a number of which exceeds the predetermined fixed-number, the subcarriers being allocated in a predetermined transmission frequency band;
- a generation unit which generates pilot signals or PAPR (Peak to Average Power Ratio) reduction signals for reducing a PAPR of the data signal;
- and
- a control unit which controls means for controlling the subcarrier allocation unit to allocate the pilot signals or the PAPR reduction signals as signals other than the data signal to subcarriers in a band to which the data signal is not allocated by the subcarrier allocation unit.
A transmission method comprising:
- converting a time-domain data signal to a frequency-domain data signal of a predetermined number;
- a subcarrier allocation step of allocating the frequency-domain data signal obtained in the time/frequency-domain conversion to any of subcarriers, a number of which exceeds the predetermined number, the subcarriers being allocated in a predetermined transmission frequency band;
- generating pilot signals or PAPR (Peak to Average Power Ratio) reduction signals for reducing a PAPR of the data signal;
- and
- controlling, by a control unit, the subcarrier allocation to allocate the pilot signals or the PAPR reduction signals as signals other than the data signal to subcarriers in a band to which the data signal is not allocated.
Dependencies are inferred from the claim text.