Patent ID: 7974358

Claim:
An orthogonal frequency division multiplexing (OFDM) system, comprising: an OFDM transmitter configured to transmit OFDM signals through a communication channel, the OFDM transmitter comprising: a channel encoder configured to encode a plurality of information bits; an interleaver configured to interleave the channel-encoded information bits; a mapper configured to map the interleaved channel-encoded information bits into mapped multi-level symbols; and a dispersive encoder configured to dispersively encode the mapped symbols using a plurality of sub-carriers with various weights, wherein the dispersive encoder is constructed by: defining a first basis set of a rectangularly-pulsed OFDM signal; defining a bilinear transform; applying the bilinear transform to the first basis set of rectangularly-pulsed OFDM signal; constructing a second basis set containing zero-edged continuous basis signals; and constructing the dispersive encoder based on the second basis set; and an OFDM receiver configured to receive the transmitted OFDM signals and to iteratively decode the received OFDM signals based on a soft decision method.