Fractional rate modem with trellis

Details Fractional rate modem with trellis Fractional rate modem with trellis

1991-04-05

1993-10-05

Chin, Stephen

Pulse or digital communications

Repeaters

Testing

375 39, 371 43, 341 61, H04L 2704

Patent

active

052512363

ABSTRACT:
A data transmitting QAM modem with partitions incoming data into unequal frames. Some of the bits in each frame are encoded using fractional rate encoding and then recombined the rest of the bits to form frames of equal bits. Trellis encoding is then performed on the frames of equal bits. Advantageously the number of points in the QAM constellation is also increased to an integer divisible by a power of 2 to reduce the complexity of fractional rate encoding.

REFERENCES:
patent: 4993046 (1991-02-01), Saito et al.
patent: 5008902 (1991-04-01), Key et al.
patent: 5056117 (1991-10-01), Gitlin et al.
patent: 5103227 (1992-04-01), Betts

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