noise

1 Star2 Stars3 Stars4 Stars5 Stars (6 votes, average: 4.00 out of 5)
Loading ... Loading ...
Print Print

Modeling phase noise (frequency domain approach)

by Krishna Sankar on September 30, 2012

plot_simulated_phase_noise_profile

In typical wireless system simulations, there is  a need to model the phase noise profile of the local oscillator. For eg, the phase noise profile of the oscillator can be of the shape described in [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 3.00 out of 5)
Loading ... Loading ...
Print Print

Transmit spectrum with phase noise

by Krishna Sankar on August 28, 2012

spectrum_plot_phase_noise

The earlier posts on phase noise discussed about phase noise in oscillators, conversion of phase noise profile to jitter and the impact of phase noise on the error vector magnitude (evm). This post discuss the [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (7 votes, average: 3.14 out of 5)
Loading ... Loading ...
Print Print

EVM with phase noise

by Krishna Sankar on July 9, 2012

constellation_plot_phase_noise_esn0

The previous post on phase noise discussed about finding the root mean square phase noise for a given phase noise profile. In this post let us discuss about the impact of phase noise on the [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (6 votes, average: 3.33 out of 5)
Loading ... Loading ...
Print Print

Phase noise power spectral density to Jitter

by Krishna Sankar on June 22, 2012

power_spectral_density_oscillator_phase_noise

Following a brief discussion with my friend Mr. Rethnakaran Pulikkoonattu on phase noise profiles, he pointed me to his write up on Oscillator Phase Noise and Sampling Clock Jitter . In this post, we will discuss the math behind integrating [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 5.00 out of 5)
Loading ... Loading ...
Print Print

Oscillator phase noise

by Krishna Sankar on June 8, 2012

oscillator_lorentzian_spectrum

Oscillators are used in typical radio circuits to drive the mixer used for the up-conversion or down-conversion of the passband transmission. Ideally, the spectrum of the oscillator is expected to have an impulse at the [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (No Ratings Yet)
Loading ... Loading ...
Print Print

Thermal noise of RC low pass filter

by Krishna Sankar on May 6, 2012

thermal_noise_RC_low_pass_filter

  This post discuss about the thermal noise in RC low pass filter. Using the noise equivalent model using resistor with a voltage source, which gets passed through a no noise RC low pass filter. [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 4.00 out of 5)
Loading ... Loading ...
Print Print

Noise Figure of cascaded stages

by Krishna Sankar on April 21, 2012

cascaded_noise_sources_noise_figure

Following the discussion on thermal noise and it’s modeling and noise figure computation for a simple resistor network, in this article let us discuss the Noise Figure of cascaded stages.

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 2.50 out of 5)
Loading ... Loading ...
Print Print

Noise Figure of resistor network

by Krishna Sankar on April 13, 2012

thermal_noise_parallel_resistor

The post on thermal noise described the noise produced by resistor  ohms over bandwidth  at temperature Kelvin. In this post, let us define the noise voltage at the input and output of a resistor network and further use it to [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (2 votes, average: 2.50 out of 5)
Loading ... Loading ...
Print Print

Thermal Noise and AWGN

by Krishna Sankar on March 25, 2012

spectral_density_thermal_noise

A friend called me up couple of days back with the question – How white is AWGN? I gave him an answer over phone, which he was not too happy about. That got me thinking [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.

1 Star2 Stars3 Stars4 Stars5 Stars (5 votes, average: 4.20 out of 5)
Loading ... Loading ...
Print Print

ADC SNR with clock jitter and quantization noise

by Krishna Sankar on February 22, 2012

snr_10bit_adc_with_different_rms_jitter_specifications

My friend and colleague Mr. Vineet Srivastava pointed me to a nice article on  clock jitter - Clock Jitter Effects on Sampling : A tutorial – by Carlos Azeredo-Leme, IEEE Circuits and Systems Magazine, Third Quarter [...]

D id you like this article? Make sure that you do not miss a new article by subscribing to RSS feed OR subscribing to e-mail newsletter. Note: Subscribing via e-mail entitles you to download the free e-Book on BER of BPSK/QPSK/16QAM/16PSK in AWGN.