From the monthly archives:

April 2008

MCDES 2008 at Indian Institute of Science, Bangalore

Thanks to Prof. K V S Hari, I was informed that the centenary year for Indian Institute of Science (IISc), Bangalore starts on May 27th 2008.
As part of the event, a conference with the theme Managing Complexity in a Distributed World (MCDES) is to be held at IISc from May27th to 31st 2008.

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Raised cosine filter for transmit pulse shaping

In the previous post on transmit filtering using Nyquist pulse, we had briefly learned that the information symbol with a symbol period can be transmitted without inter symbol interference (ISI) by using Nyquist pulse,
.
The resultant waveform is ideally bandlimited to frequencies from Hz to Hz.
However, in typical transmission schemes, we do not hear [...]

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OT: Prof. Randy Pausch’s lecture in Oprah show

In the past, I have wondered about discussing personal thoughts in this blog. The answer in my mind was NO and I ve been focusing only on technical topics till date. However, there is a change of mind, thanks to my friend Manoj.
Thanks to him, I happened to see Prof. Randy Pausch’s brief 10 minute [...]

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Transmit pulse shaping filter – rectangular and sinc (Nyquist)

In the previous post on I-Q modulator and de-modulator, we had briefly mentioned that the a baseband PAM transmission can be modelled as
, where
is the symbol period,
is the symbol to transmit,
is the transmit filter,
is the symbol index and
is the output waveform.
In this post, the objective is to understand the properties of [...]

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Need for I-Q modulator and demodulator

Post describes about the need for I-Q modulation by comparing the spectral efficiency of passband PAM and passband QAM.

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