Method and apparatus for high-speed data transfer employing self-synchronizing quadrature amplitude modulation
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United States of America Patent
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Jul 17, 2018
Grant Date -
Aug 17, 2017
app pub date -
Feb 6, 2017
filing date -
Mar 5, 2009
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Abstract
Methods and apparatus for wired communications are disclosed. A method for transmitting a data stream through a wired communications channel includes encoding the data stream to produce a first baseband modulating signal I(t) and a second baseband modulating signal Q(t) whose amplitudes together represent a time series of complex symbols (I, Q) each selected from a two-dimensional (2-D) constellation of symbols distributed on the phase plane about the origin such that at least one of the baseband modulating signals has a substantially non-zero mean amplitude, modulating the baseband signals I(t) and Q(t) to produce a modulated signal, wherein the I(t) and Q(t) components of the modulated signals are generally fixed in quadrature, and providing the modulated signal to a wired communications channel.
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