Modem and method using multidimensional coded modulation

Details Modem and method using multidimensional coded modulation Modem and method using multidimensional coded modulation

G - Physics

06

F

354/67

G06F 11/10 (2006.01) H03M 13/25 (2006.01) H04L 27/34 (2006.01)

Patent

CA 1295741

ABSTRACT OF THE DISCLOSURE 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 determines the maximum likelihood path from a plurality of surviving paths formed from branches selected from the candidate branches.

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