ORTHOGONAL FREQUENCY MULTIPLEXING

摘要

An OFDM transmitter includes a lookup table for storing at least two groups of data digits associated with different respective characteristic frequencies (e.g. 3960 MHz, 5016 MHz). An addressing circuit addresses the lookup table and repeatedly and sequentially selects the groups of data digits. The data digits of the selected group are output sequentially. The output sequence of data digits is converted to analog form, and each group of data digits, when output and converted to analog form, provides a carrier signal at the characteristic frequency associated with that group. The carrier signal is modulated in accordance with an information signal to provide a transmission signal.