초록 ▼

A signal processing scheme through which the receiver may, at any time, synchronize or resynchronize itself to the transmitted data signals that are received over a dynamic dispersive channel. At the transmitter, bursts or sequences of known symbols are interleaved with unknown data. At the receiver

A signal processing scheme through which the receiver may, at any time, synchronize or resynchronize itself to the transmitted data signals that are received over a dynamic dispersive channel. At the transmitter, bursts or sequences of known symbols are interleaved with unknown data. At the receiver incoming frames of signals (containing interleaved bursts of known data and unknown data) are processed in a manner similar to the processing of spread spectrum encoded data. A replica (or respective replicas) of the known signal burst(s) is (complex) correlated with the incoming signal to locate and lock onto a known (PN) reference symbol burst. Once a known symbol block has been located, a symbol rate clock (bit sync) is adjusted to track out any offset in the timing used for sampling the received data. This is followed by coarse and fine frequency offset adjustments to enable the local oscillator to lock onto the transmitted frequency.

대표청구항 ▼

For use in a communications receiver wherein signals received thereby contain successive data symbols between which are interleaved sequences of prescribed known symbols, the distribution of said interleaved sequences of prescribed known symbols among said data symbols being predetermined, said know

For use in a communications receiver wherein signals received thereby contain successive data symbols between which are interleaved sequences of prescribed known symbols, the distribution of said interleaved sequences of prescribed known symbols among said data symbols being predetermined, said known symbols being employed in said receiver for providing compensation for distortion-introduced characteristics of a channel over which signals received have been transmitted, a method of operating said receiver to enable said receiver to detect said data symbols comprising the steps of: (a) selectively combining a replica of said known symbols with received symbol-representative signals so as to identify where, within the received signals, said sequences of prescribed known symbols whose distribution among said data symbols is predetermined are interleaved; and (b) causing the distortion-introducing characteristics of the channel to be compensated in accordance with the contents of received signals including those whose locations within the received signals correspond to those of the interleaved prescribed known symbols indentified in step (a).