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AssigneesAmerican Telephone and Telegraph Company, Bell Telephone Laboratories, Incorporated
InventorsWalter Debus, Jr., Mohsen Kavehrad
Estimating the term…
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.
Receiver apparatus for use in a communications system which transmits digital data signals each capable of having a plurality of transmitted values, said digital data signals being transmitted on carrier signals having polarizations which are orthogonal to one another and said carr:er signals being processed to recover said data signals, said apparatus comprising
The apparatus of cIaim 5 wherein said examining means combines said error signals associated w:th the data signals recovered from tne same carrier s:gnal to form second error signals.
A communications system wherein digital data signals each having a plurality of values are transmitted on carrier signals having orthogonal polarizations, said system having a transmitter comprising
Dependencies are inferred from the claim text.