Patent ID: 6546041
Filing Date: 2003-04-08
Classification: H04B

Abstract:
A radio transmission method for digital information comprising the steps of:from a transmitting side, transmitting, over a radio transmission line, a modulated radio-frequency wave obtained by modulating a radio-frequency wave by a transmission baseband IQ signal, which is obtained by frame-synthesizing a baseband digital IQ signal modulated by the digital information to a spread spectrum IQ code sequence whose auto-correlation side lobe is equal to zero; and at the receiving side, separating a received signal of the spread spectrum IQ code sequence and a received signal of the baseband digital-modulated IQ signal from a received baseband signal obtained by receiving the modulated radio-frequency wave, and demodulating a waveform-equalized signal, which is obtained by waveform-equalization of the received signal of the baseband digital-modulated IQ signal by the use of transmission parameters of the radio transmission line derived from a despread spectrum signal obtained by despreading the spread spectrum IQ code sequence, to obtain a received data signal of the digital information transmitted from the transmitting side.