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公开(公告)号：EP2686965A1
公开(公告)日：2014-01-22
申请号：EP12713903.8
申请日：2012-03-16
Applicant: ST-Ericsson SA
Inventor： EPIFANO, Fabio
CPC classification number: H03F1/3247 , H04B1/0475 , H04B1/30 , H04L27/0002 , H04L27/364 , H04L2027/0016
Abstract: There is described a method for compensating the phase and gain distortions of a transmitter analog front end affected by a leakage of a local oscillator. The method comprises generating a single complex tone signal in a digital front end, wherein the generation comprises compensating the signal gain and phase with gain and phase offsets. The method comprises feeding the compensated signal into the transmitter analog front end. The method comprises feeding a corresponding output signal of the transmitter analog front end into a nonlinear component, thereby generating an inter-modulation between the complex tone signal and at least one tone signal due to the local oscillator leakage. The method comprises feeding the output of the nonlinear component into a measurement receiver analog front end. The method comprises filtering the output of the measurement receiver analog front end with a band pass filter in order to isolate the inter-modulation, which is indicative of the distortions introduced by the transmitter analog front end. The method comprises measuring the power of the filtered signal. The method comprises updating the gain and phase offsets according to the measured power, by reducing said measured power. The disclosure also relates, in particular, to a digital front end, to an analog system, to a telecommunication device, to a computer program, and to a storage medium.
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公开(公告)号：EP2708078A1
公开(公告)日：2014-03-19
申请号：EP12723417.7
申请日：2012-05-11
Applicant: ST-Ericsson SA
Inventor： EPIFANO, Fabio
IPC: H04W56/00
CPC classification number: H04W56/00
Abstract: An amount of delay between a digital reference signal and a digital derived signal is measured, wherein the derived signal is derived from the reference signal. Measurement involves ascertaining a sign of a slope of the derived signal over a first time interval and producing a set of time-associated reference signs by ascertaining a sign of a slope of the reference signal over each of a plurality of different time intervals leading up to the first time interval. A first set of coincidence results is produced by detecting coincidence between the sign of the slope of the derived signal and each one of the time-associated reference signs in the set of time-associated reference signs. The first set of coincidence results is used alone or in combination with other coincidence results as an indicator of the amount of delay between the reference signal and the derived signal.
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公开(公告)号：EP2708078B1
公开(公告)日：2016-08-31
申请号：EP12723417.7
申请日：2012-05-11
Applicant: ST-Ericsson SA
Inventor： EPIFANO, Fabio
IPC: H04W56/00
CPC classification number: H04W56/00
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