Jan 22, 2008 #1 L liberal Advanced Member level 4 Joined Nov 25, 2004 Messages 105 Helped 0 Reputation 0 Reaction score 0 Trophy points 1,296 Activity points 828 How to measure SNR ? how to measure QPSK SNR with a spectrum analyzer?
Jan 23, 2008 #2 V vfone Advanced Member level 6 Joined Oct 10, 2001 Messages 5,709 Helped 1,616 Reputation 3,237 Reaction score 1,248 Trophy points 1,393 Activity points 36,250 Re: How to measure SNR ? Using the Spectrum Analyzer (and a signal generator) you can measure only the Signal to Noise Ratio at the input of the demodulator, which is given by the formula: SNR [dB] = 174 + RX_sens [dBm] – 10*LOG(BW_Hz) – NF [dB] For QPSK SNR have to demodulate the signal and do a BER or EVM test.
Re: How to measure SNR ? Using the Spectrum Analyzer (and a signal generator) you can measure only the Signal to Noise Ratio at the input of the demodulator, which is given by the formula: SNR [dB] = 174 + RX_sens [dBm] – 10*LOG(BW_Hz) – NF [dB] For QPSK SNR have to demodulate the signal and do a BER or EVM test.