Multiplexing of multicarrier signals

摘要

A transmitter and corresponding method, for transmitting an OFDM signal over a communications channel, includes a plurality of base-band OFDM modulators, each modulating a respective data signal onto a plurality of orthogonal sub-carriers, and outputting a respective sub-channel OFDM signal; and applies fast convolution filtering and digital up-conversion to the sub-channel OFDM signals, to produce a combined OFDM signal, that includes each of the sub-channel OFDM signals. The fast convolution and up-converter filters each of the sub-channel OFDM signals, and shifts the frequency of the sub-channel signals to respective designated frequencies within the combined OFDM signal. A corresponding receiver is also provided.