Simultaneous analog and digital communication using partitioning of bits into words

• US 5,844,944 A
• Filed: 05/20/1997
• Issued: 12/01/1998
• Est. Priority Date: 06/14/1993
• Status: Expired due to Term

• Current Assignee: Rembrandt Communications LP (Rembrandt IP Management, LLC)
• Original Assignee: Paradyne Corporation (Dasan Networks Incorporated)
• Inventors: Bremer, Gordon, Betts, William Lewis
• Primary Examiner(s): Chin, Wellington
• Assistant Examiner(s): Corrielus, Jean B.
• Application Number:
  US08/858,988
• Time in Patent Office: 560 Days
• Field of Search: 375/259, 375/260, 375/261, 375/295, 375/298, 375/216
• US Class Current: 375/298
• CPC Class Codes: H04J 7/00 Multiplex systems in which the amplitudes or durations of the signals in individual channels are characteristic of those channels
• CPC Class Codes: H04L 27/3461 in order to transmit a subchannel
• CPC Class Codes: H04L 27/3483 using a modulation of the constellation points

Abstract

Digital data is encoded by partitioning a predetermined number of bits into two separate words. The first word is mapped into a first symbol constellation to produce a first data signal. The second word is mapped into a second symbol constellation that has a different number of symbols than the first symbol constellation to produce a second data signal. An additional signal is added to the first data signal to form a first combined signal. Another additional signal is added to the second data signal to form a second combined signal. The first and second combined signals are transmitted over a communication channel.

Claims

1. A communications method comprising the steps of:

partitioning a predefined number of bits into a first word and a second word;

mapping said first word into a first symbol constellation having a first number of symbols to produce a first data signal;

mapping said second word into a second symbol constellation having a second number of symbols to produce a second data signal, said first and second number of symbols being unequal;

adding a third signal to said first data signal to form a first combined signal;

adding a fourth signal to said second data signal to form a second combined signal; and

transmitting said combined signals.

2. The method of claim 1, wherein said step of transmitting comprises modulating said combined signals using quadrature amplitude modulation (QAM).

3. The method of claim 1, further comprising the step of:

encoding an input signal to produce said third signal, said third signal having two dimensions.

4. The method of claim 1, further comprising the step of:

encoding an input signal to produce said fourth signal, said fourth signal having two dimensions.

5. The method of claim 1, further comprising the steps of:

encoding a first input signal to produce said third signal, said third signal having two dimensions; and

encoding a second input signal to produce said fourth signal, said fourth signal having two dimensions.

6. A communications method comprising the steps of:

partitioning a predefined number of bits into a first word and a second word;

mapping said first word into a first symbol constellation having a first number of symbols to produce a first data signal;

mapping said second word into a second symbol constellation having a second number of symbols to produce a second data signal, said first and second number of symbols being unequal;

adding a first analog signal to said first data signal to form a first combined signal, wherein said first data signal and said first analog signal are simultaneously transmitted;

adding a second analog signal to said second data signal to form a second combined signal, wherein said second data signal and second analog signal are simultaneously transmitted;

modulating a first carrier signal with said first combined signal to form a first modulated carrier signal;

modulating a second carrier signal with said second combined signal to form a second modulated carrier signal; and

transmitting said modulated carrier signals.

7. The method of claim 6, wherein said step of modulating said first modulated carrier signal comprises using quadrature amplitude modulation (QAM).

8. The method of claim 6, wherein said step of modulating said second modulated carrier signal comprises using quadrature amplitude modulation (QAM).

9. The method of claim 6, wherein said steps of modulating said first modulated carrier signal and said second modulated carrier signal comprise using quadrature amplitude modulation (QAM).

10. The method of claim 6, further comprising the step of:

encoding an input signal to produce said first analog signal, said first analog signal having two dimensions.

11. The method of claim 6, further comprising the step of:

encoding an input signal to produce said second analog signal, said second analog signal having two dimensions.

12. The method of claim 6, further comprising the steps of:

encoding an input signal to produce said first analog signal, said first analog signal having two dimensions; and

encoding an input signal to produce said second analog signal, said second analog signal having two dimensions.

13. A system for transmitting data, comprising:

a means for partitioning a predetermined number of bits into a first word and a second word;

a means for mapping said first word into a first symbol constellation having a first number of symbols to produce a first data signal;

a means for mapping said second word into a second symbol constellation having a second number of symbols to produce a second data signal, said first and second number of symbols being unequal;

a means for adding a third signal to said first data signal to form a first combined signal;

a means for adding a fourth signal to said second data signal to form a second combined signal; and

a means for transmitting said combined signals.

14. The system defined in claim 13, wherein said means for transmitting said combined signals is further comprised of a means for modulating said combined signals using quadrature amplitude modulation (QAM).

15. The system defined in claim 13, further comprising:

a means for encoding an input signal to produce said third signal, said third signal having two dimensions.

16. The system defined in claim 13, further comprising:

a means for encoding an input signal to produce said fourth signal, said fourth signal having two dimensions.

17. The system defined in claim 13, further comprising:

a means for encoding a first input signal to produce said third signal, said third signal having two dimensions; and

a means for encoding a second input signal to produce said fourth signal, said fourth signal having two dimensions.

18. A system for transmitting data, comprising:

a means for partitioning a predefined number of bits into a first word and a second word;

a means for mapping said first word into a first symbol constellation having a first number of symbols to produce a first data signal;

a means for mapping said second word into a second symbol constellation having a second number of symbols to produce a second data signal, said first and second number of symbols being unequal;

a means for adding a first analog signal to said first data signal to form a first combined signal, wherein said first data signal and said first analog signal are simultaneously transmitted;

a means for adding a second analog signal to said second data signal to form a second combined signal, wherein said second data signal and second analog signal are simultaneously transmitted;

a means for modulating a first carrier signal with said first combined signal to form a first modulated carrier signal;

a means for modulating a second carrier signal with said second combined signal to form a second modulated carrier signal; and

a means for transmitting said modulated carrier signals.

19. The system defined in claim 18, wherein said means for modulating said first modulated carrier signal uses quadrature amplitude modulation (QAM).

20. The system defined in claim 18, wherein said means for modulating said second modulated carrier signal uses quadrature amplitude modulation (QAM).

21. The system defined in claim 18, wherein said means for modulating said first modulated carrier signal and said second modulated carrier signal uses quadrature amplitude modulation (QAM).

22. The system defined in claim 18, further comprising:

a means for encoding an input signal to produce said first analog signal, said first analog signal having two dimensions.

23. The system defined in claim 18, further comprising:

a means for encoding an input signal to produce said second analog signal, said second analog signal having two dimensions.

24. The system defined in claim 18, further comprising:

a means for encoding an input signal to produce said first analog signal, said first analog signal having two dimensions; and

a means for encoding an input signal to produce said second analog signal, said second analog signal having two dimensions.