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This paper proposes a low-complexity iterative receiver for the recentlyproposed Orthogonal Chirp Division Multiplexing (OCDM) modulation scheme, wherewe consider a system under frequency-selective channels and constrained tochannel state information availability only at the receiver. It has been shownthat under these assumptions, OCDM becomes an optimal waveform in terms ofperformance, i.e., frame error rate (FER), when employing a receiver capable ofachieving perfect feedback equalizer (PFE) performance. Thus, this work targetsproposing such a receiver for OCDM with low-complexity. Our approach is basedon the well accepted minimum mean squared error with parallel interferencecancellation (MMSE-PIC), where we derive an approximated equalizer whosecomplexity is reduced to two fast Fourier transforms (FFTs) per iteration. TheFER results reveal that i) the proposed low-complexity receiver perform as goodas the original MMSE-PIC, ii) OCDM performs very closely to PFE, and iii) OCDMhas approximately 2.5 dB improvement over OFDM.

Low-Complexity Iterative Receiver for Orthogonal Chirp Division Multiplexing