Reception level measuring system

Details Reception level measuring system Reception level measuring system

2006-07-25

2006-07-25

Tran, Khai (Department: 2637)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S325000, C375S349000, C342S357490, C342S362000, C342S418000, C455S226200

Reexamination Certificate

active

07082155

ABSTRACT:
A reception level measuring system in which a base station in a code division multiple access (CDMA) mobile communication system measures a reception level of a signal from a mobile station. The reception level measuring system has an approximate-line estimating device, a phase-rotation estimating device; a Doppler-frequency estimating device and a reception signal power estimating device. The approximate-line estimating device provides an approximate line by linearly approximating signal amplitudes of a demodulated data stream in I- and Q-channels from a reception signal, in a time interval which is set in accordance with an estimated Doppler frequency. The phase-rotation estimating device estimates an amount of phase rotation based on a gradient of the approximated line. The Doppler-frequency estimating device estimates the estimated Doppler frequency based on the amount of phase rotation; and the reception signal power estimating device estimates a reception signal power based on said approximate line.

REFERENCES:
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patent: 11-112417 (1999-04-01), None
patent: 11-186990 (1999-07-01), None
patent: WO 99/031835 (1999-06-01), None

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