| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a deterioration in orthogonality between spreading codes even under radio wave propagation environment with large angular dispersion in MC-CDMA communication system. <P>SOLUTION: The transmitter includes a spreading means for carrying out code spreading for a signal series in a certain spread format, a transmitting means for transmitting an output signal of an inverse Fourier transforming means through a prescribed beam pattern, an angular dispersion detecting means for seeking angular dispersion with respect to the receiver, and a control means for adjusting the dispersion format based on the comparison result between the angular dispersion and a transmitting beam width. The dispersion means includes a frequency region dispersing means having a reproducing means for reproducing the signal series as many as a first reproducing number, and a first output means for generating a parallel signal series in spreading codes; and a time region dispersing means having a reproducing means for reproducing the signal series as many as a second reproducing number, and a second output means for generating a serial signal series in spreading codes. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
