5. The method of claim 4 for coding information further comprising the step of converting binary 1's to -1's and binary 0's to 1's for said first group of signals prior to addressing said four-dimensional code words.
5. The method of claim 4 for coding information further comprising the step of converting binary 1's to -1's and binary 0's to 1's for said first group of signals prior to addressing said four-dimensional code words. 6. The method of claim 5 for coding information further comprising the steps of expanding the number of bits in said second group of signals from three to four in a convolutional encoder comprising three bits of memory, and converting the binary 1's to -1's and binary 0's to 1's.