Fractional rate modem with trellis
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United States of America Patent
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Oct 5, 1993
Grant Date -
N/A
app pub date -
Apr 5, 1991
filing date -
Apr 5, 1991
priority date (Note) -
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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.
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