recent posts Support Vibha’s Dream Mi... Posted by Krishna Pillai on June 19, 2009
My friend Mr. Balaji volunteers for Vibha, a non-profit  organization whose mission is to ensure that every underprivileged child attains his or her right to education, health and opportunity. Vibha, which was founded in 1991 has a volunteer network...
MSK transmitter and receiver...
MSK transmitter and receiver
Posted by Krishna Pillai on June 16, 2009
In a post on Minimum Shift Keying (MSK), we had discussed that MSK uses two frequencies which are separated by and phase discontinuity is avoided in symbol boundaries. In that post, we had discussed MSK as a continuous phase transmit signal and...
Solved objective questions (GA...
Solved objective questions (GATE)
Posted by RV on May 17, 2009
Using the services of a new author ‘RV’, we are starting a new series of articles in the blog. Typically in India, many of the competitive examinations pertaining to Engineering (GATE, IES) and rectuitment by private and public sector...
BER with Matched Filtering...
BER with Matched Filtering
Posted by Krishna Pillai on May 8, 2009
In the post on transmit pulse shaping filter, we had discussed pulse shaping using rectangular and sinc. In this post we will discuss about optimal receiver structure when pulse shaping is used at the transmitter. The receiver structure is also called...
Six equalizers for V-BLAST...
Six equalizers for V-BLAST
Posted by Krishna Pillai on April 21, 2009
In the past, we had discussed several posts on two transmit two receive MIMO communication, where the transmission was based on V-BLAST. The details about V-BLAST can be read from the landmark paper V-BLAST: An architeture for realizing very high...
Transmit beamforming...
Transmit beamforming
Posted by Krishna Pillai on April 13, 2009
In this post lets discuss a closed-loop transmit diversity scheme, where the transmitter has the knowledge of the channel. As there is a feedback path required from the receiver, to communicate the channel seen by the receiver to the transmitter,...
Milestone 1000+ subscribers 11...
Milestone 1000+ subscribers 1100+ comments
Posted by Krishna Pillai on March 28, 2009
Those who are regular visitors to dsplog.com might have noticed the small FeedBurner chicklet on the side showing subscriber count showing 1000+ subscribers. Its a nice milestone to reach, one that looked so distant when I wrote the first post stating...
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recent from Diversity Transmit beamforming Transmit beamforming
In this post lets discuss a closed-loop transmit diversity scheme, where the transmitter has the knowledge of the channel. As there is a feedback path required from the receiver, to communicate the channel seen by the receiver to the transmitter, the scheme is called closed-loop transmit diversity scheme....
recent from DSP Approximate Vector Magnitude Computation Approximate Vector Magnitude Computation
In this post, let us discuss a simple implementation friendly scheme for computing the absolute value of a complex number . The technique called (alpha Max + beta Min) algorithm is discussed in Chapter 13.2 of Understanding Digital Signal Processing, Richard Lyons and is also available online at Digital...