Patent ID: 8243781

Claim:
An apparatus for signal quality measurement on GFSK signals, comprising: a plurality of binary information bits, modulated and sent with an analog output to a channel; a received RF signal, processed through a Rx RF unit combined with a filter to obtain a filtered value, being from the channel; a frequency discriminator, used for extracting a frequency deviation information from the filtered value; a decoder, used for sampling the frequency deviation information at the correct timing to decode and generate a plurality of decoded bits; and a signal quality measurement unit, used for measuring a signal quality of the plurality of decoded bits, being a pre-calibrated measurement, wherein the signal quality measurement unit comprises: a frequency deviation information, used for measuring a receive power and a noise power; a plurality of decoded bits, used for measuring the noise power on the current frequency deviation information by comparing with a plurality of pre-calibrated trellis; a plurality of averaging over samples units, used for making the receive power and the noise power become accurate and reliable; and a subtraction and division unit, used for calculating a ratio of the receive power and the noise power as a quality indicator to obtain a signal quality.