Timing and carrier recovery in dual polarization communications

Details Timing and carrier recovery in dual polarization communications Timing and carrier recovery in dual polarization communications

1986-08-19

1988-02-23

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

375 39, 455 60, H04J 1100

Patent

active

047275340

ABSTRACT:
A technique is disclosed for improving the recovery of data signals transmitted on orthogonally polarized carrier signals by creating redundancy with respect to timing and carrier information. In the receiver, the carrier and timing recovery circuitry, which controls the recovery of the data signals from the incoming orthogonally polarized carrier signals, operate in response to a selected one of the carrier signals or at least one data signal recovered from this selected carrier signal. This selection is based on an examination of the data signals recovered from each of the orthogonally polarized carrier signals. Use of the described technique advantageously lessens the possibility of the carrier and timing recovery circuits losing synchronous operation during fading as it is less likely that a fade will simultaneously affect both orthogonally polarized carrier signals. As a result, data signal recovery is improved.

REFERENCES:
patent: 4095053 (1978-06-01), Duttweiler et al.
patent: 4521878 (1985-06-01), Toyonaga

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