TRANSMITTER AND METHOD FOR REDUCING PEAK-TO-AVERAGE POWER RATIO

摘要

A transmitter includes: first and second IFFT units that respectively generate first and second time domain signals from first and second modulated signals generated in first and second modulation schemes; a clipping noise signal generator that generates a clipping noise signal representing a difference between a combined signal of the first and second time domain signals and a specified threshold in a time period in which the power of the combined signal is higher than the threshold; first and second calculators that respectively subtract the clipping noise signals to which first and second coefficients are multiplied from the first and second time domain signals; first and second frequency filters that respectively filter output signals of the first and second calculators; and a combiner that generates a transmission signal including an output signal of the first frequency filter and an output signal of the second frequency filter.

主权项

1. A transmitter comprising:
a first IFFT (inverse fast Fourier transform) unit that generates a first time domain signal from a first modulated signal that is generated in a first modulation scheme and allocated in a first frequency band; a second IFFT unit that generates a second time domain signal from a second modulated signal that is generated in a second modulation scheme and allocated in a second frequency band; a clipping noise signal generator that generates a clipping noise signal that represents a difference between a combined signal of the first time domain signal and the second time domain signal and a specified threshold in a time period in which the power of the combined signal is higher than the threshold; a first calculator that subtracts the clipping noise signal to which a first coefficient is multiplied from the first time domain signal; a second calculator that subtracts the clipping noise signal to which a second coefficient is multiplied from the second time domain signal; a first frequency filter that filters an output signal of the first calculator; a second frequency filter that filters an output signal of the second calculator; and a combiner that generates a transmission signal that includes an output signal of the first frequency filter and an output signal of the second frequency filter.