Radio communication apparatus

Details Radio communication apparatus Radio communication apparatus

2011-08-16

2011-08-16

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S316000, C375S147000, C375S346000, C343S745000, C343S750000, C343S850000, C343S852000, C343S860000, C343S861000

Reexamination Certificate

active

08000379

ABSTRACT:
An object of the invention is to stabilize the convergence operation at the automatic impedance matching time and ensure the reception quality in the convergence process in a fading environment in a radio communication apparatus which performs automatic impedance matching between an antenna and a Radio frequency section to decrease the impedance matching loss, for example, when the apparatus is brought close to a human body. A radio communication apparatus of the invention includes a Radio frequency section3which converts a received signal into a baseband signal, a variable impedance unit2which adjusts impedance between an antenna1and the Radio frequency section3, a pilot signal extraction unit4which extracts a pilot signal from the baseband signal, a first channel compensation unit5which performs channel compensation using an output of the pilot signal extraction unit, an impedance control adequacy detection unit7which detects impedance control adequacy using an output of the first channel compensation unit, an impedance control unit8which controls the variable impedance unit2using an output of the impedance control adequacy detection unit, a second channel compensation unit6which performs channel compensation using the pilot signal, and a demodulation section9which performs the demodulation operation using an output of the second channel compensation unit.

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Ogawa Koichi et al; “Automatic Impendance Matching of an Active Antenna Near the Human Operator by the Steepest Gradient Algorithm,” The transactions of the Institute of Electronics, Information and Communication Engineers, The Institute of Electronics, Information and Communication Engineers, Sep. 2004, vol. J87-B, No. 9, pp. 1287-1298.
Chinese Office action for the corresponding Chinese patent application 200680024143.X dated Mar. 16, 2011.

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