Method and apparatus for achieving 180.degree. phase invariant transmission in a PCM modem system
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United States of America Patent
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Jul 9, 2002
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N/A
app pub date -
Feb 7, 2000
filing date -
Feb 7, 2000
priority date (Note) -
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Abstract
In a PCM modem system in which equivalence classes are used to communicate information from a transmitter to a receiver, a method is provided to solve the problem of 180.degree. phase reversals in the communications channel which result in a garbled transmission. This is accomplished by remapping the equivalence classes into a form that can be differentially encoded and decoded such that equivalence class identity is not lost during a phase reversal of the channel.
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