| 摘要 |
<p>A spread-spectrum communication device which has a reduced size, consumes less power and is produced at low cost by suppressing variation of the amplitude of a signal and relaxing the linearity required by an amplifier. A transmission signal is divided into an I-phase component and a Q-phase component. A complex spectrum-spreading unit (301) spreads the spectrum by means of multipliers (304, 305) and adders (302, 303) by using a series pattern in which 1 and -1 alternately appear. The output of the complex spectrum-spreading unit (301) is modulated by multipliers (306, 307) by using a pseudo-random series PN(k) (x) assigned to each user. A baseband signal shaped in waveform by roll-off filters (308, 309) is modulated by a carrier modulation unit (316), sent to and amplified by a power amplifier (315), and transmitted from an antenna (317).</p> |
