H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/41
H04B 7/005 (2006.01) H04K 3/00 (2006.01) H04L 5/12 (2006.01)
Patent
CA 1310701
Abstract For the purpose of channel condition estimation at the receiver end, a reference signal (fq(t)) is added to and is transmitted with the data signal (fi(t)) containing the actual information. The addition of the reference signal (fq(t)) to the data signal (fi(t)) is effected by means of a quadrature modulation with the reference signal on the Q-level and with the data signal on the I-level, the envelopes being selected so that the value of the complex envelope is constant. The receiver has a function stage for preprocessing the receive signal, for quadrature detection of the data signal elements and reference signal elements (yi) and b(i) respectively, for selection of the data/reference signal and for estimating the channel condition. This permits the operation of non-linear transmitter final stages and a maximum energy output from the transmitter, and the requirements of the short-wave range such as very low signal-to-noise ratio and signal interference ratio, fading, slightly drifting local oscillators and time bases, as well as high noise burst frequency are taken account of in an optimum manner. In addition the send signal has a narrow bandwidth and a low sensitivity to bit slip, which increases the connection probability and the robustness of the transmission.
595424
Kueng Roland
Widmer Hanspeter
Kirby Eades Gale Baker
Zellweger Telecommunications Ag
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