8. The method of claim 2 for coding information wherein said information comprises a block of twelve binary bits, said first group comprises nine of said binary bits and said second group comprises the other three of said twelve binary bits.
9. The method of claim 8 for coding information wherein said four-dimensional code words consist of a set of five hundred and twelve four-dimensional code words stored in a memory device and each of said four-dimensional code words consist of a subset of four numbers which represent the coordinates of a signal point in four-dimensional space.