Rohde and Schwarz Gmbh & Co. Kg

Thomas Reichert

Jochen Pliquett

A method for clock synchronisation between an amplitude-modulated or phase-modulated received signal (r(t)) and a transmitted signal (s(t)) estimates the timing offset (&#x3b5;) between the received signal (r(t)) and the transmitted signal (s(t)) by means of a maximum-likelihood method. The maximum-likelihood method in this context is realised by an estimation filtering (S; S) dependent upon the transmission characteristic, a subsequent nonlinear signal-processing function (S; S) and an averaging filtering (S, S; S, S). The received signal (r(t)) is especially a modified vestigial-sideband-modulated received signal (r'(t)). The nonlinear signal-processing function (S; S) maintains the alternating component in the spectrum of the pre-filtered vestigial-sideband-modulated received signal (v&#x2032;(t)).

Method and device for clock synchronisation with a vestigial-sideband-modulated transmitted signal

A method and a device for carrier-frequency synchronization of a vestigial-sideband-modulated received signal (r(t)) with a carrier signal (e), which is affected by a frequency offset and/or phase offset (&#x394;f, &#x394;&#x3c6;), estimates the frequency offset and/or phase offset (&#x394;f, &#x394;&#x3c6;) of the carrier signal (e) by means of a maximum-likelihood estimation. For this purpose, the vestigial-sideband-modulated received signal (r(t)) is converted into a modified vestigial-sideband-modulated received signal (x'(t&#x2032;)), which provides time-discrete complex rotating phasors (|x&#x2032;(t&#x2032;)|&#xb7;e), in which only the time-discrete phases (2&#x3c0;&#x394;ft&#x2032;+&#x394;&#x3c6;) are dependent upon the frequency offset and/or phase offset (&#x394;f, &#x394;&#x3c6;).

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Munich, Germany

Thomas Reichert