Simultaneous analog and digital communication using fractional rate encoding
AssigneeParadyne Corporation
InventorsWilliam Lewis Betts, Gordon Bremer
Life of this patent
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Abstract
Digital data is encoded using a modulus m converter to produce fractionally encoded words, where m is the nearest integer larger than 2.sup.c and c is a noninteger. The fractionally encoded words are mapped into a symbol constellation having m symbols to produce a two dimensional data signal. The data signal is added to a two dimensional analog signal, which was obtained by encoding an input analog signal, to produce a combined two dimensional signal. The combined signal is modulated using QAM and then transmitted over a communication channel.
Claims15
A communication method comprising the steps of:
- mapping data bits into a symbol constellation having a plurality of symbols to produce a data signal, each of said plurality of symbols representing a noninteger number of said data bits;
- adding a second analog signal to said data signal to form a combined signal;
- and
- transmitting said combined signal.
A communication method comprising the steps of:
- encoding binary data having binary bits, to produce fractionally encoded words,
- mapping said fractionally encoded words into a symbol constellation to produce a data signal;
- adding a second signal to said data signal to form a combined signal;
- and
- transmitting said combined signal.
A system for transmitting data, comprising:
- a means for mapping a number of data bits a first symbol constellation having a first number of symbols to produce a first data signal;
- a means for mapping an analog signal into a second symbol constellation having a second number of symbols to produce a second data signal;
- a means for adding said first data signal to said second data signal to form a combined signal;
- and
- a means for transmitting said combined signal.
Dependencies are inferred from the claim text.