SIR or SNR measurement apparatus

Details SIR or SNR measurement apparatus SIR or SNR measurement apparatus

1997-09-04

2000-02-22

Tse, Young T.

Pulse or digital communications

Testing

Signal noise

375284, 375346, 455 673, 4552263, H04B 110, H04L 500

Patent

active

060288949

ABSTRACT:
SIR measurement for measuring S/N ratio, which is the ratio of a desired signal power to noise power, or S/I ratio, which is the ratio of desired signal power to interference signal power, uses a signal-point position altering unit for taking absolute values of an I component (in-phase component) and Q component (quadrature component) of a received signal to convert the received signal to a signal in the first quadrant of an I-Q orthogonal coordinate system, and for squaring the average value of the converted signal to obtain first average power (desired power) S, a received-power arithmetic unit for calculating the average value of the square of the received signal to obtain second average power, and for subtracting the desired power S from the received power to obtain noise power or interference power I, and a SIR arithmetic unit for calculating S/N ratio or S/I ratio from the desired signal power S and noise power or interference signal power I, and for outputting the ratio calculated.

REFERENCES:
patent: 4835790 (1989-05-01), Yoshida et al.
patent: 5524026 (1996-06-01), Murata

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