Data receiver adapted to receive a modulated signal and method of operating such a data receiver.

摘要

In a multipoint data communication system a master modem and a plurality of tributary modems are interconnected via respective transmission channels Adaptive equalizer circuitry (55, 56) in the master modem equalizes the channel from a particular tributary by multiplying samples of signals received from the tributary by an ensemble of tap coefficients associated with the tributary and stored in a memory (91). Timing-acquisition circuitry (29) adjusts the phase of the master's sampling circuitry (23, 27) at the start of transmission from a given tributary The master samples and equalizes the received timing acquisition signal to form a succession of timing acquisition equalizer outputs. The timing acquisition signal is illustratively a double-dotting pattern having a four-symbol-interval period which is integrally related to the carrier frequency This allows the samples needed in order to begin forming the timing acquisition equalizer outputs to be generated by replicating the samples taken over only four symbol intervals.