  Delay alignment modulation (DAM) has been recently proposed to enable
inter-symbol interference (ISI)-free single-carrier (SC) communication without
relying on sophisticated channel equalization. The key idea of DAM is to
pre-introduce deliberate symbol delays at the transmitter side, so that all
multi-path signal components may arrive at the receiver simultaneously and be
superimposed constructively, rather than causing the detrimental ISI. Compared
to the classic orthogonal frequency division multiplexing (OFDM) transmission,
DAM has several appealing advantages, including low peak-to-average-power ratio
(PAPR) and high tolerance for Doppler frequency shift, which makes DAM also
appealing for radar sensing. Therefore, in this paper, DAM is investigated for
the emerging integrated sensing and communication (ISAC) setup. We first derive
the output signal-to-noise ratios (SNRs) for ISI-free communication and radar
sensing, respectively, and then propose an efficient beamforming design for
DAM-ISAC to maximize the communication SNR while guaranteeing the sensing
performance. The comparison analysis of DAM versus OFDM for ISAC is developed,
and it is revealed that DAM enables higher sensing SNR and larger Doppler
frequency estimation. Simulation results are provided to show the great
potential of DAM for ISAC
