Pulse or digital communications – Repeaters – Testing
Patent
1981-10-06
1984-08-14
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
375 97, 375118, 329112, H04L 2722
Patent
active
044661088
ABSTRACT:
An apparatus for providing coherent detection of a series of data bursts without a preamble by providing a reference waveform which has the same frequency as the carrier for a received TDMA/MPSK transmission, but having an arbitrary phase with respect to such signals. The reference waveform is used for pseudo-coherent demodulation. Symbol timing is available at all times by using symbol synchronization obtained from the previous bursts of the same transmission. The symbol timing is used to sample two quadrature outputs of the pseudo-coherent demodulator once per MPSK symbol interval. Storage of a sufficient number of demodulator samples allows a carrier phase estimate to be obtained from the message burst itself. The carrier phase estimate is then used for coherent detection on a delayed sequence of the demodulator samples.
REFERENCES:
patent: 3818347 (1974-06-01), Holsinger
patent: 3990016 (1976-11-01), Dimon
patent: 4034305 (1977-07-01), Sato
patent: 4313205 (1982-01-01), Rhodes
patent: 4355404 (1982-10-01), Uzunoglo
Nosaka et al., "PSK Demodulator with Delay Line for the PCM-TDMA System", Aug. 1970, IEEE Transactions on Communication Technology, vol. COM-18, No. 4.
Chin Stephen
Communications Satellite Corporation
Griffin Robert L.
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