Patent ID: 7864872
Filing Date: 2011-01-04
Classification: H04B,H04L

Abstract:
1. A transmitting device that processes radio transmitted signals, comprising: a frequency conversion means for converting 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 for changing an amplitude of the frequency signal while retaining phase information of the frequency signal; means for reconverting the frequency signal having the spectrum characteristic processing applied into a time sequence signal; means for transmitting a signal reconverted into the time sequence signal as a pre-amble signal for attaining synchronization at a receiver together with a data body; and modulation processing means for modulating the data body to attain a modulated signal for transmission, wherein the modulated signal is transmitted together with the pre-amble signal, wherein the modulation processing means performs an OFDM modulation that applies amplitude and phase modulation to each of a plurality of carriers, applies inverse FFT to the plurality of carriers, and converts the carriers into signals on the time base, while retaining orthogonality of each of the plurality of carriers on the frequency axis, and the spectrum characteristic processing means sets a spectrum amplitude of an original time sequence signal to a specific value at a center frequency band and end frequency bands of a frequency domain in use, and smoothes the spectrum amplitude at the other frequency bands, in a manner that the spectrum amplitude of the original time sequence signal becomes equal to that of a general OFDM signal while retaining phase information of the original time sequence signal.