A multipoint-to-point, orthogonal frequency division multiplexed (OFDM) communication system is provided. In one embodiment, a system includes: a host unit including a demodulator that simultaneously demodulates upstream information modulated on a plurality of tones within an OFDM waveform, and a plurality of remote units for transmission of upstream information, each remote unit including a modem, the remote units modulating a plurality of tones with upstream information so that when received at the host unit the tones are orthogonal within the OFDM waveform.