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Binary phase-shift keying (BPSK)
BPSK (also sometimes called PRK, Phase Reversal Keying, or 2PSK) is the simplest form of phase shift keying (PSK). It uses two phases which are separated by 180° and so can also be termed 2-PSK. It does not particularly matter exactly where the constellation points are positioned, and in this figure they are shown on the real axis, at 0° and 180°. This modulation is the most robust of all the PSKs since it takes the highest level of noise or distortion to make the demodulator reach an incorrect decision. It is, however, only able to modulate at 1 bit/symbol (as seen in the figure) and so is unsuitable for high data-rate applications when bandwidth is limited.
{play}attachments/062_bpsk-31.mp3{/play} BPSK-31 test sample
{play}attachments/062_bpsk-63.mp3{/play} BPSK-63 test sample
{play}attachments/062_bpsk-125.mp3{/play} BPSK-125 test sample

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