I just read the patent and I can't believe that:
a) Garbage like that is actually accepted (the word "random" does not mean what those submitting the patent think it does).
b) Something that blatantly simple is patentable.
Without reading the patent I came up with a pretty similar scheme in my head while trying to work out how frequency hoping would be managed -- it's so damn obvious and lacking in technical detail that anyone with a vague idea about how devices may operate could come up with it.
I hate to admit but until now I hadn't read the patents over which the many brawls reported on the register have taken place -- but now I have I know that the US patent system is an innovation-killing cesspool which the world would be better off without.