Why not?

I was hoping that readers of this blog would ask more technical questions which would allow me to provide technical explanations. Unfortunately, most of the questions I get are related to xMax, and are not really technical in nature. Recently some readers asked: “How come only you are writing critical assessments of xMax?” (actually there is one other). Others asked “Why isn’t there a more widespread technical discussion of xMax?” The answer of course is that I do not know. However, I can make a reasonable guess. There are several possible reasons, including:

(i) The xMax technology is virtually unknown to people involved in wireless communications. (ii) To get knowledgeable people interested in a new modulation technique they first need to see a credible technical exposition of the technique which will motivate them to spend the time and effort to study it and write about it. No such discussion is currently available. (iii) The information that is currently available about xMax is of such poor technical quality that a competent communication engineer or researcher will not give it a second look. In particular, the false performance claims and the misconceptions evident in the patents discourage any serious examination of xMax.

Before seeing more discussions of this technology by people who are experts in the field, there will have to be an openly available credible technical document describing xMax and its performance. From what I have seen so far, and given xG Technology’s penchant for secrecy, this is not likely to happen. More fundamentally, xMax is just not that exciting from the point of view of communication theory. It is based on a waveform that is different from the waveforms used by conventional modulation techniques, but otherwise does not seem to offer anything new, and does not offer any performance advantages over existing techniques. It is well known that there is an infinite variety of communication waveforms that can be used to design a communication system. While it is certainly of interest to learn of the implementation of a system which uses a waveform which has not been used before, there is nothing particularly surprising about that fact, given that there is an infinity of waveforms to choose from.

The only truly exciting thing about xMax, which was what got me interested in this in the first place, is the claim that “xMax can use 1,000 to 100,000 times less power than comparable transmission technologies.” It is most unfortunate that this claim is false.

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