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one protocal, multiple modulation technique. Is it possible?

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allysonsim

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multiple modulation

I'm doing some research on OFDM and Software defined radio and i found out that there are several weaknesses in OFDM which are linearity problem etc.

Is it possible if i bring in CSS (chirp spread spectrum) and substitue OFDM?
 

Re: one protocal, multiple modulation technique. Is it possi

You'r right there are open working areas in OFDM and true CSS have specific advantages.

I think in general you have to spend more linearity for higher Bit/s/Hz. But OFDM could be extended to lower modulation types down to the extreme of a chirp symbol. There are also approaches to use the chirp as preamble. On other way round you can apply equalisation, precoding and all the new techniques also to CSS.

I actual interested in applying CSS and OFDM to wireless sensor networks with very high adaptivity in link budget and also implementing ranging.
 

I see, that's means we can eventually plug in CSS into well developed OFDM right?

I am quite interested in your project as well. I am currently looking towards building a Software defined radio in Matlab and i will improve it from there. Do you think this is a good approach?

By the way.. are you designing the whole prototype or just implementation stage (simulation)?
 

Re: one protocal, multiple modulation technique. Is it possi

My research covering a broad range form circuit level implementation innovation to high performance non-layered MAC protocols.

It is focused on highly efficient wireless sensor networks with localization. The base of the research is the detailed understanding of OFDM, fast rate-adaption, time-delay-measurements, equalisation and synchronisation, deep frame sleep modes, wake and after-wake synchronisation, PA efficiency.

CSS comes into play if the SINR is less than 2dB and broadband is still required because of PA effciency, synchronisation, frame search, delay measurement.
 

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