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Phase Shift Keying Acoustic Communication in Air with Impulse Response

We propose a new phase shift keying (PSK) modulation method for acoustic communication in air. The main problem for communicating in air is the existence of an impulse response that significantly distorts waveforms. Unlike conventional PSK modulation that disturbs phase information, particularly in the bit-inversion point owing to the convolution between signals and the impulse response of the communication system, the new PSK modulation method reduced the effect of the impulse response effectively by inserting a guard time (GT) or a buffer signal (BS) between symbols. From our experiments, the proposed PSK modulation method achieves approximately 10 times higher bit-error rate (BER) than conventional modulation when the signal-to-noise ratio (SNR) is -5 dB. The obtained results suggest that the new PSK modulation method can effectively improve BER at the same SNR.