Encoding a first modulation type with a first spectral efficiency into a second modulation type capable of having a second spectral efficiency

1. An apparatus comprising:

logic that enables decoding a signal enabled to be encoded with at least two spectral efficiencies in a single type of modulation; by enabling decoding of a higher order modulation format mapped into an efficiency of a lower order modulation format by unmapping a first encoding signal order into a second encoding signal order; wherein the first encoding signal order uses a first modulation scheme; wherein the second encoding signal order uses a second modulation scheme; and wherein the first modulation scheme uses fewer constellation points than the second modulation scheme.

2. The apparatus of claim 1 wherein the single type of modulation enables switching between the at least two encoding signal orders without disrupting a control loop between a modulation module encoding data transmitted using the single modulation type and a demodulation module decoding the data.

3. The apparatus of claim 1 wherein the first spectral efficiency is M-ary quadrature amplitude modulation (M-QAM) and wherein the second spectral efficiency is N-ary quadrature amplitude modulation (N-QAM); further wherein N>M.

4. The apparatus of claim 1 wherein at least one of the two encoding signal orders is 8 quadrature amplitude modulation (QAM).

5. The apparatus of claim 1 wherein at least one of the two encoding signal orders is quadrature phase shift keying (QPSK).

6. The apparatus of claim 1 wherein the logic further enables:

generating a sequence of one or more known bits; and

using the one or more known bits for decoding the first modulation scheme into the second modulation.

7. The apparatus of claim 6 wherein unique words is used to synchronize the sequence of one or more known bits.

8. The apparatus of claim 6 wherein the generating the sequence of known bits is done by one or more pseudo random bit generators.

9. The apparatus of claim 1 wherein the mapping includes adding bits to a binary phase shift keying (BPSK) signal corresponding to a known sequence of bits to encode it to quadrature phase shift keying (QPSK) signal.

10. A method to decode a single modulation format enabled to contain two different orders of modulation; by enabling a decoding of modification of a higher order modulation format operating at an efficiency of a lower order modulation format by:

generating a sequence of one or more known bits; and

unmapping a first encoded signal order from a second encoding signal order; wherein the first encoded signal order uses a first modulation scheme; wherein the second encoded signal order uses a second modulation scheme; and wherein the first modulation scheme uses fewer constellation points than the second modulation scheme; wherein the one or more known bits are used to decode the second modulation scheme into the first modulation.

11. The method of claim 10 , wherein a unique words is used to synchronize the sequence of the one or more known bits.

12. The method of claim 10 wherein the generating the sequence of known bits is done by one or more pseudo random bit generators.

13. The method of claim 10 wherein the first spectral efficiency is M-ary quadrature amplitude modulation (M-QAM) and wherein the second spectral efficiency is N-ary quadrature amplitude modulation (N-QAM) further wherein N>M.

14. The method of claim 10 wherein at least one of the two encoding signal orders is 8 quadrature amplitude modulation (QAM).

15. The method of claim 10 wherein at least one of the two encoding signal orders is quadrature phase shift keying (QPSK).

16. The method of claim 10 wherein the mapping includes adding bits to a binary phase shift keying (BPSK) signal corresponding to a known sequence of bits to encode it to quadrature phase shift keying (QPSK) signal.

17. An apparatus comprising:

logic that enables:

decoding a signal order by unmapping a first encoding signal order from a second encoding signal order to recover a higher order modulation format from a signal operating at an efficiency of a lower order modulation, wherein:

the first encoding signal order uses a first modulation scheme;

the second encoding signal order uses a second modulation scheme; and

the first modulation scheme uses fewer constellation points than the second modulation scheme.

18. The apparatus of claim 17 wherein the mapping includes:

generating a sequence of one or more known bits; and

encoding the generated sequence of one or more bits and one or more data bits into the second encoding signal order.

19. The apparatus of claim 18 wherein the generation the sequence of known bits is done by one or more pseudo random bit generators.

20. The apparatus of claim 17 wherein the first encoding signal order is a binary phase shift keying (BPSK) signal and the second encoding signal order is a quadrature phase shift keying (QPSK) signal to make the BPSK signal circularly symmetric.