| 摘要 |
<p>Modem (12) including a transmitter (10) having a convolutional encoder (18) 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 (10) further providing modulation of a carrier signal, and a receiver (80) wherein a commonality-seeking, branch cost calculator (100) determines the candidate branch associated with the minimum cost N-dimensional symbol subset for each coset and a Viterbi decoder (104) which determines the maximum likelihood path from a plurality of surviving paths formed from branches selected from the candidate branches.</p> |
