on bluetooth Noise figure

[vivek1214]

bluetooth required snr

What is the theoritical noise figure for sensitivity of -85dBm

 

[RFCMOS]

Hello,


To answer, we need to know what is the S/N (or Eb/N0) your baseband can tolerate at its input without exceeding a specific BER (defined in the norm)?

 

[hmsheng]

Sensitivity = -174dBm/Hz + 10*log(BW) + NF + SNR
where, NF is the receiver chain noise figure, SNR is coresponding to the modulation type and BER specification.

 

[vivek1214]

thanks for your answers, but how to decide that what SNR is required? once SNR is known it is easy to calculate NF

e.g. for sensitivity of -70dBm they generally take 23dB SNR so that NF comes to be 21dB
but whats the situation for -85dBm sensitivity

 

[hmsheng]

SNR depends on the modulation type and BER required.

 

[vivek1214]

can you give me details of muduation scheme and required SNR

 

[fanshuo]

please check oppenheimer's book "Signal and system" first

 

[khouly]

for every digital modulation scheme there is BER curve
this curve relate the SNR to the BER , by knowing the BER u can get the SNR required by the demodulator.
that's it

khouly