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May 2008

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Update: Correction in Matlab code for raised cosine filter

Krishna Sankar17 years ago13 years ago91 mins

Thanks to the keen observation by Mr. Phan Minh Hoang, I was notified that the Matlab/Octave scripts provided along with the topic raised cosine filtering was not behaving properly. Reason: I was not taking care of the division by zero when creating the raised cosine filter taps. 🙁

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  • Modulation

Article in DSPDesignLine.com: M-QAM symbol error

Krishna Sankar17 years ago13 years ago211 mins

Its been a nice week for me, wherein I guest posted an article in DSPDesignLine.com. 🙂 The article derives the theoretical symbol error rate for M-QAM modulation. The theoretical results are further supplemented by Matlab/Octave simulation scripts. Those who are familiar with derivation of symbol error rate for 16-QAM modulation will find the equations easy…

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  • Modulation

Bit error rate for 16PSK modulation using Gray mapping

Krishna Sankar17 years ago13 years ago401 mins

In this post, let us derive the theoretical bit error probability for 16PSK modulation using Gray coded mapping. For deriving the equation, we will refer material from the following posts: (a) Symbol Error Rate for 16PSK (b) Gray code to Binary code conversion for PSK (c) Binary to Gray code conversion for PSK As discussed…

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  • Modulation

Gray code to Binary conversion for PSK and PAM

Krishna Sankar17 years ago13 years ago181 mins

Given that we have discussed Binary to Gray code conversion, let us discuss the Gray to BInary conversion. Conversion from Gray code to natural Binary Let be the equivalent Gray code for an bit binary number with representing the index of the bit. 1. For , i.e, the most significant bit (MSB) of the Gray…

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  • Modulation

Binary to Gray code conversion for PSK and PAM

Krishna Sankar17 years ago13 years ago141 mins

In this post, let us try to understand Gray codes and their usage in digital communication. Quoting from Wiki entry on Gray code [Gray-Wiki], The reflected binary code, also known as Gray code after Frank Gray, is a binary numeral system where two successive values differ in only one digit. In a digital communication system,…

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  • News

OT: Migration to a Deep Blue template

Krishna Sankar17 years ago16 years ago11 mins

After almost 6 months with the Smashing Theme template, its time for a change. Recently I stumbled upon the Deep Blue template from DailyBlogTips. I liked the clean blue-green-white combination and and felt it might be a good fit for www.dsplog.com. Hope you agree. One key feature which I like is addition of tag cloud…

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  • Filter

Eye diagram with raised cosine filtering

Krishna Sankar17 years ago17 years ago201 mins

We have discussed about probable transmit pulse shaping filter and have observed that raised cosine filtering filtering allows a simpler implementation, albeit at the cost of increased bandwidth. Let us know understand the eye diagram, which is a useful graphical tool to quantify the degradation of the signal due to filtering. Eye diagram An eye…

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16-PSK 16-QAM 802.11a 2012 Alamouti AWGN BPSK Capacity Communication conference Digital Diversity ECE electromagnetics eye diagram first order FSK GATE Gray IISc interpolation machine_learning Math MIMO ML MMSE modulator noise Nyquist OFDM PAM pdf phase phase_noise PSK pulse shaping QAM raised cosine Rayleigh SIC STBC TETRA transmitter Viterbi ZF

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  • Krishna Sankar on Bit Error Rate (BER) for BPSK modulation
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  • Krishna Sankar on BER for BPSK in ISI channel with Zero Forcing equalization

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