Fading pitch measuring apparatus, fading pitch measuring method and portable information terminal using them
OwnerHiroyuki Fukadainventor
Life of this patent
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Abstract
In a CDMA-system based mobile station or an equivalent, to provide a high-precision measurement of a fading pitch without using a plurality of branches (antennas) for receiving a plurality of reception waves which may appear to have no correlation to one another, a plurality of despreading devices 5a, 5b, 5c, 5d connected to a shared reception system is provided for performing despreading for each multipath. Signals outputted from the plurality of despreading devices 5a, 5b, 5c, 5d are synthesized with a phase difference in each multipath being maintained by a first synthesizer 6 to obtain a synthesized signal. A fading pitch fD is detected based upon the synthesized signal by a fading pitch detector 7
Claims12
A fading pitch detection apparatus comprising:
- a plurality of demodulators, connected to a shared reception system, each for demodulating a reception signal through each multipath;
- a synthesizer for synthesizing signals outputted from the plurality of demodulators with a phase difference in each multipath being maintained;
- and
- a fading pitch detector for detecting a fading pitch based upon an output signal from the synthesizer.
A fading pitch detection apparatus, comprising:
- a transforming device for transforming an input signal including a fading-based variation to electric power;
- an auto-correlation detector for calculating an auto-correlated value of an output signal from the transforming device;
- and
- a fading pitch estimation device for calculating a facing pitch based upon a comparison result between the auto-correlated value and a predetermined threshold value.
A method for detecting a fading pitch, comprising:
- demodulating a reception signal through each multipath by a shared reception system;
- synthesizing demodulated signals for each multipath with a phase difference in each multipath being maintained;
- and
- detecting a fading pitch based upon a synthesized output signal.
A method for detecting a fading pitch, comprising:
- transforming an input signal including a fading-based variation to electric power;
- calculating an auto-correlated value of an electric power output signal;
- comparing the auto-correlated value with a predetermined threshold value;
- and
- calculating a fading pitch based upon a comparison result.
Dependencies are inferred from the claim text.