Technique for acquiring timing and frequency synchronization for modem utilizing known (non-data) symbols as part of their normal transmitted data format

摘要: A signal processing scheme through which the receiver may, at any time, synchronize or resynchronize itself to transmitted data signals that are received over a dynamic dispersive channel. At transmitter, bursts sequences of known symbols (11) interleaved with unknown (12). incoming frames (containing and data) in manner similar spread spectrum encoded data. replica (or respective replicas) burst(s) is (complex) correlated locate lock onto (PN) reference symbol burst. Once block has been located, rate clock (33) (bit sync) adjusted track out offset timing used for sampling This followed by coarse fine frequency adjustments enable local oscillator (44) frequency.