+ def get_noise_voltage(self, SNR):
+ S = 0 # dBm, assuming signal power normalized
+ N = S - SNR # dBm
+ npwr = pow(10.0, N/10.0) # ratio
+ nv = scipy.sqrt(npwr * self.sps) # convert the noise voltage
+ return nv
+
+
+ # System Parameters
+ def sample_rate(self):
+ return self._sample_rate
+
+ def set_sample_rate(self, sr):
+ self._sample_rate = sr
+
+
+ # Channel Model Parameters
+ def snr(self):
+ return self.snr_dB
+
+ def set_snr(self, snr):
+ self.snr_dB = snr
+ noise = self.get_noise_voltage(self.snr_dB)
+ self.channel.set_noise_voltage(noise)
+
+ def frequency_offset(self):
+ return self.fo * self.sample_rate()
+
+ def set_frequency_offset(self, fo):
+ self.fo = fo / self.sample_rate()
+ self.channel.set_frequency_offset(self.fo)
+
+ def timing_offset(self):
+ return self.to
+
+ def set_timing_offset(self, to):
+ self.to = to
+ self.channel.set_timing_offset(self.to)
+
+
+ # Receiver Parameters
+ def rx_gain_mu(self):
+ return self.gain_mu
+
+ def rx_gain_omega(self):
+ return self.gain_omega
+
+ def set_rx_gain_mu(self, gain):
+ self.gain_mu = gain
+ self.gain_omega = .25 * self.gain_mu * self.gain_mu
+ self.receiver.set_gain_mu(self.gain_mu)
+ self.receiver.set_gain_omega(self.gain_omega)
+
+ def rx_alpha(self):
+ return self.alpha
+
+ def rx_beta(self):
+ return self.beta
+
+ def set_rx_alpha(self, alpha):
+ self.alpha = alpha
+ self.beta = .25 * self.alpha * self.alpha
+ self.receiver.set_alpha(self.alpha)
+ self.receiver.set_beta(self.beta)
+