Patent ID: 7532674

Claim:
A transmitting device that processes radio transmitted signals, comprising: a frequency conversion means that converts an original time sequence signal of a known multi-valued pattern into a frequency signal to attain a spectrum characteristic; a spectrum characteristic processing means that changes an amplitude of the frequency signal while retaining phase information of the frequency signal; and a means that reconverts the frequency signal having the spectrum characteristic processing applied into a time sequence signal; a means that transmits a signal reconverted into the time sequence signal as a pre-amble signal for attaining synchronization on a receiving side together with a data body; and a modulation processing means that modulates the data body to attain a modulated signal for transmission, wherein the modulated signal is transmitted together with the pre-amble signal, wherein the spectrum characteristic processing means forcibly changes a spectrum amplitude of an original time sequence signal, in a manner that the spectrum amplitude of the original time sequence signal becomes equal to that of the modulated signal for transmission, while retaining phase information of the spectrum of the original time sequence signal.