H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/120
H04B 1/10 (2006.01) H04L 1/20 (2006.01) H04L 27/00 (2006.01) H04L 27/38 (2006.01)
Patent
CA 1224531
Abstract of the Disclosure: A quality measure of a signal received at a receiver of a two-dimensional linear modulation data communication system, is measured by using a phase controlled baseband signal (yk.exp(j?k)) obtained from the received signal and a reproduced data signal (?k) derived from the phase controlled baseband signal. That portion of the quality measure which is introduced into the received signal in a transmission channel for the received signal, is measured by estimating a data signal component (?k) which includes intercode interference, by subtracting the data signal component from the phase controlled baseband signal to produce a difference signal of a phase difference relative to the reproduced data signal, by giving the phase difference to the difference signal to produce a phase adjusted signal, and by calculating a mean square of an inphase component of the phase adjusted signal. Portions of the quality measure which are related to a carrier phase jitter component and a carrier frequency offset component, are measured also by the use of the phase controlled baseband signal and the reproduced data signal. It is possible to carry out the method by a signal processor.
438337
Corporation Nec
Smart & Biggar
LandOfFree
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