Modem and method using multidimensional coded modulation

Abstract From the Canadian patent

Disclosed is a modem including a transmitter having a convolutional encoder for transforming each group interval digital data into an expanded bit sequence having symbol-selecting bits and a frame of subset-selecting bits forming a plurality of bit groups with each bit group, designating a 2-dimensional subset and the symbol-selecting bits being used to select one 2-dimensional symbol from each of the selected subsets, the transmitter further providing modulation of a carrier signal and a receiver wherein a commonality-seeking branch cost calculator, determines the candidate branch associated with the minimum cost N-dimensional symbol subset for each coset and a Viterbi decoder which …