10. The method of claim 9 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.
10. The method of claim 9 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. 11. The method of claim 10 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.