Ultra wideband modulation explained

The modulation techniques for ultra wide band are a buzzword in the industry. There are several interesting ideas and techniques which aim to increase spreading ratios which are used dramatically over the techniques for spread spectrum.

The narrowband techniques are carrier centered and the carrier wave is normally used as the reference signal for the modulation signal. However, the techniques for ultra wide band are quite radically different since they do not use a carrier wave in a conventional way.

Techniques for modulation in ultra wideband

Researchers are constantly studying various techniques for modulation schemes. These schemes need to put out a short energy bust which has to be followed with a big gap.

There are mainly four techniques which are currently being explored by researchers in order to do this:

* Singlet impulses like a spike
* Paired impulses or doublets
* Monocycles which are a single sinewave cycle
* Wavelets which are small sinewave cycles that have been shaped

The monocycles and wavelets seem to be the favorite in ultra wideband since various techniques have existed for quite some time for generating them. However, even generating wavelets or monocycle will not really allow them to encode the messages.

The most hyped and talked about technique for encoding ahs been the Time modulated ultra wideband technique which had been pioneered in the US by Time Domain. In this technique, a stream of monocycles are produced at an average rate which is quite short when compared to the gaps between.

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The modulation is imposed them by shifting the cycles just in time so that they arrive before or after the datum point, delayed or advanced by a fixed time increment.  This is also an equivalent to the PPM scheme but it differs from the conventional since a monocycle has replaced the carrier wave.

Wide band has sparked quite a lot of controversy today and has been widely discussed. Although it does open up quite a lot of new possibilities and endless options, it is still far from being implanted widely in the consumer market.

The THSS scheme is still in its infancy and is only a fusion of a few spread spectrum techniques and new techniques for generating monocycles. From the three ideas which are a part of THSS, just one is still untried. Although it is not yet a mature technology, the first products could soon be emerging in the market very soon.

There is still a lot of theoretical work which has to be done on the ultra wide band modulation techniques and many techniques have yet to be explored and studied. The work which can be done can include antenna and module technology and coding scheme variations.

Much of the ultra wideband potential cannot really be exploited until these are studied in detail.

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