Psk modem system having improved demodulation reliability

Details Psk modem system having improved demodulation reliability Psk modem system having improved demodulation reliability

H - Electricity

04

L

325/16

H04L 27/18 (2006.01) H04L 27/20 (2006.01) H04L 27/233 (2006.01)

Patent

CA 1269714

Abstract of the Disclosure A modem system is disclosed which has improved reli- ability of detection of transmitted PSK data using a simple signal delay detection scheme. A transmission signal is produced in which repetitive digital time slots each contain phase encoded "mark" or "space" data. Each time slot includes a reference phase portion at at least one of a front and rear portion of the time slot. The phase of the transmitted signal changes in the remaining portion of each time slot in accordance with applied digital data. For a "mark" data signal the phase changes from a reference phase in a first direction to predetermined phase in a first half of the remaining portion of the time slot, and then back to the reference phase before the end of the time slot. For a "space" data signal the phase changes from the reference value in a second direction opposite the first to another predetermined value in a first half of the remaining portion of the time slot, and then back to the reference phase before the end of the time slot. A simple delay detection demodulation system is used to recreate the original digital signal.

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