TRANSMITTER SYSTEM, ESPECIALLY FOR CELLULAR TELEPHONY

摘要

The invention relates to a transmitter system, especially for cellular telephony, which modulates a modulation signal (cos omega mt, sin omega mt) onto a low-frequency carrier signal (cos 1/3 omega t, sin 1/3 omega t) using two intermediate-frequency rejecting mixers (5, 6), and which translates the signal (cos 1/3 omega t+ omega mt, sin 1/3 omega t+ omega mt) thereby obtained and present on the outputs of the modulators (5, 6) as a complex signal due to the circuitry of the inventive transmitter system into a desired transmission frequency by means of a frequency translator (4). The invention combines the advantages of vector modulation at a relatively low frequency with the advantages of an intermediate-frequency rejection mixing during modulation.