Method and apparatus for controlling signal coherency in simulca

Details Method and apparatus for controlling signal coherency in simulca Method and apparatus for controlling signal coherency in simulca

1989-07-20

1990-11-20

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455 33, 455 51, 455 54, 455 56, H04B 700

Patent

active

049724100

ABSTRACT:
A simultaneous broadcast (simulcast) system transmits from a control site to two or more remote sites the same data information along with a synchronous digital signal via a synchronous digital transmission network. At the remote sites, a clock signal is derived from the digital signal for timing the broadcast of the data information on an RF carrier. The clock signal phase is periodically reset to a known phase using a predetermined pattern of data bits in the digital signal. A time delay circuit at the control site delays the synchronous digital signal such that, where RF carrier signals from the remote sites overlap, there is time coherency between the data information. The time delay circuit is constructed so as to preserve the synchronization of the digital signal.

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Hattori et al., "A New Modulation Scheme for Multi-Transmitter Simulcast Digital Mobile Radio Communication", Mar. 1979, pp. 83-88.

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