Rank: 179 based on 313 downloads (last 30 days) and 15 files submitted
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Krishna Sankar M

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Personal Profile:

Krishna Pillai is a Signal Processing Engineer based out of Bangalore, India. His typical activities on a working day involve identifying and modeling digital signal processing algorithms for wireless receivers.

He blogs @ http://www.dsplog.com.
The objective of the blog is to:
"Explain and discuss the basic text book concepts in digital signal processing and digital communication using simple Matlab/Octave scripts."

Professional Interests:
DSP, wireless communication

 

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Files Posted by Krishna Sankar M View all
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27 Jun 2009 Screenshot MSK modulation and demodulation Script for MSK modulation/demodulation and computing BER for different Eb/N0 in AWGN. Author: Krishna Sankar M communications, msk, ber 39 1
  • 5.0
5.0 | 1 rating
27 Jun 2009 Screenshot Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M communications, alamouti, stbc, signal processing 42 5
  • 5.0
5.0 | 3 ratings
03 Dec 2008 Screenshot MIMO with Zero Forcing equalizer Describes a 2x2 MIMO system using Zero Forcing equalizer in Rayleigh fading channel. Author: Krishna Sankar M communications, zf, mimo, co channel interferen... 52 1
  • 4.0
4.0 | 2 ratings
02 Oct 2008 Screenshot Simulation of an MSK transmission Generates an MSK transmission Author: Krishna Sankar M msk, transmit, transmission, minimum shift keying 12 1
  • 5.0
5.0 | 1 rating
13 Aug 2008 Screenshot BER for BPSK in Rayleigh channel Simulates the BER for BPSK modulation in Rayleigh channel Author: Krishna Sankar M wireless, ber, bpsk, rayleigh, communications 28 7
  • 2.0
2.0 | 1 rating
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21 Oct 2009 Editing Matlab files in Vim Edit Matlab M-files in Vim editor (indentation, syntax highlighting, tags , mlint support) Author: Fabrice

Thanks Fabrice. Very useful.
May I request some more features for matching: in addition to existing, support matching groups as if/else, else/end, case/<next>case.

04 Apr 2009 Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M

@Yi Xiao: The channel power is indeed the scaling factor, no?
21 Mar 2009 Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M

@Yi Xiao: Well, for BPSK constellation, you are right - one need not divide by the channel power. However, for higher order modulations one needs to take care of the scaling factor such that the constellation boundaries can be defined correctly. Hence provided the equation for the general case. Hope this helps.
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04 Dec 2011 BER for BPSK in Rayleigh channel Simulates the BER for BPSK modulation in Rayleigh channel Author: Krishna Sankar M Merlyn

Ah nevermind, the error goes to zero (off the graph)
04 Dec 2011 BER for BPSK in Rayleigh channel Simulates the BER for BPSK modulation in Rayleigh channel Author: Krishna Sankar M Merlyn

How do you create a complete graph when using less than 10^6 transmitted bits? If I change to anything else, it truncates the graph at 1/N. I am doing this to show that when the number of bits is low the simulated and theoretical curves diverge.
10 Nov 2011 CORDIC for phase and magnitude computation Uses the cordic approach to find the phase and magnitude of a complex number Author: Krishna Sankar M Orlando, Diego
01 Nov 2011 MSK modulation and demodulation Script for MSK modulation/demodulation and computing BER for different Eb/N0 in AWGN. Author: Krishna Sankar M jue, wang
09 Jul 2011 BER for BPSK in Rayleigh channel Simulates the BER for BPSK modulation in Rayleigh channel Author: Krishna Sankar M jiang

i have tried to realize the simulation of qpsk with rayleigh channel by mutiplying h first,then mutiply conj(h)/abs(h) ,then hard deciding the result with a constellation abs(h) of the orignal one. but the result is not so good .can you help me explain it?
Top Tags Applied by Krishna Sankar M
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wireless, ber, communications, error rate, 16psk
Files Tagged by Krishna Sankar M View all
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Updated   File Tags Downloads
(last 30 days) 		Comments Rating
27 Jun 2009 Screenshot MSK modulation and demodulation Script for MSK modulation/demodulation and computing BER for different Eb/N0 in AWGN. Author: Krishna Sankar M communications, msk, ber 39 1
  • 5.0
5.0 | 1 rating
27 Jun 2009 Screenshot Alamouti STBC Discuss 2Tx. 1Rx transmit diversity scheme called Alamouti Space Time Block Coding (STBC) Author: Krishna Sankar M communications, alamouti, stbc, signal processing 42 5
  • 5.0
5.0 | 3 ratings
03 Dec 2008 Screenshot MIMO with Zero Forcing equalizer Describes a 2x2 MIMO system using Zero Forcing equalizer in Rayleigh fading channel. Author: Krishna Sankar M communications, zf, mimo, co channel interferen... 52 1
  • 4.0
4.0 | 2 ratings
02 Oct 2008 Screenshot Simulation of an MSK transmission Generates an MSK transmission Author: Krishna Sankar M msk, transmit, transmission, minimum shift keying 12 1
  • 5.0
5.0 | 1 rating
13 Aug 2008 Screenshot BER for BPSK in Rayleigh channel Simulates the BER for BPSK modulation in Rayleigh channel Author: Krishna Sankar M wireless, ber, bpsk, rayleigh, communications 28 7
  • 2.0
2.0 | 1 rating

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