| 摘要 |
PURPOSE:To enable high speed communication in a radio data system where the width of a use frequency band and spectrum spreading ratio are limited. CONSTITUTION:A parallel/serial converter 10 converting an information signal to a 1:k bit, information modulators 21 to 2n performing an information modulation of each of m=k/n bits obtained by dividing the k-bit outputted by the parallel/serial converter 10, phase shifters 31 to 3n performing phase shifts for each of the modulation outputs of the information modulators 21 to 2n, spreading code generators 41 to 4n generating the spreading codes for performing spreading spectrum, multipliers 51 to 5n multiplying the output signals of the phase shifters 31 to 3n and the spreading codes from the spreading code generators 41 to 4n, an adder 70 adding the outputs of the multipliers 51 to 5n, a D/A converter 80, and radio parts 90 and 100 are composed of an antenna 100. |
