Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In digital communications, differential coding is a technique used to provide unambiguous signal reception when using some types of modulation. It makes data to be transmitted to depend not only on the current bit (or symbol), but also on the previous one. The common types of modulation that require differential coding include phase shift keying and quadrature amplitude modulation. To demodulate BPSK one needs to make a local oscillator synchronous with the remote one. This is accomplished by a carrier recovery circuit. However, a carrier can be recovered in different ways, depending upon a valid phases count (2 for BPSK).

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