PHASE-SHIFT KEYING, or PSK, is one of the most efficient encoding techniques for digital data transmission through voicegrade telephone lines. Compared to other encoding methods, such as frequency shift keying, PSK techniques offer much more efficient use of the available bandwidth, and can achieve one bit per second data rates per cycle of bandwidth'. The most commonly used PSK technique is the four-phase keying where the carrier phase is shifted in multiples of 4S0, corresponding to a pair of binary data bi…
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