Data inversion techniques

A method, comprising:

• identifying, for transmission, data symbols of a signal modulated with a modulation scheme that includes at least four physical levels, the modulation scheme relating each physical level of the at least four physical levels with a respective logic level of at least four logic levels, wherein each data symbol comprises a most significant bit and a least significant bit;
• determining to invert one or more of the data symbols of the signal;
• inverting the one or more data symbols over a signal axis between a highest physical level and a lowest physical level of the at least four physical levels by changing a value of a bit of each of the one or more data symbols, the bit comprising the most significant bit or the least significant bit, and wherein an initial physical level corresponding to a data symbol of the one or more data symbols is located at an equal distance from the signal axis as a final physical level corresponding to an inverted data symbol associated with a non-inverted data symbol;
• and
• transmitting the data symbols, based at least in part on inverting the one or more data symbols, via the signal modulated with the modulation scheme that includes the at least four logic levels.

A method, comprising:

• receiving data symbols via a signal modulated with a modulation scheme that includes at least four physical levels, the modulation scheme relating each physical level of the at least four physical levels with a respective logic level of at least four logic levels, wherein each data symbol comprises a most significant bit and a least significant bit;
• determining that one or more of the data symbols of the signal have been inverted based at least in part on an indication in the signal;
• and
• re-inverting the one or more data symbols over a signal axis at a physical level between a highest physical level and a lowest physical level of the at least four physical levels by changing a value of the most significant bit of each of the one or more data symbols based at least in part on determining that one or more of the data symbols of the signal have been inverted.

A method, comprising:

• receiving data symbols via a signal modulated with a modulation scheme that includes at least four physical levels, the modulation scheme relating each physical level of the at least four physical levels with a respective logic level of at least four logic levels, wherein each data symbol comprises a most significant bit and a least significant bit;
• determining that one or more of the data symbols of the signal have been inverted based at least in part on an indication in the signal;
• and
• re-inverting the one or more data symbols over a signal axis at a physical level between a highest physical level and a lowest physical level of the at least four physical levels by changing a value of the most significant bit of each of the one or more data symbols based at least in part on determining that one or more of the data symbols of the signal have been inverted, and wherein an initial physical level corresponding to an inverted data symbol of the one or more data symbols is located at an opposite side and at an equal distance from the signal axis as a final signal level corresponding to a re-inverted data symbol associated with the inverted data symbol.

An apparatus, comprising:

• a controller configured to identify data symbols of a signal and determine to invert one or more of the data symbols of the signal, wherein the signal is modulated with a modulation scheme that includes at least four physical levels, the modulation scheme relating each physical level of the at least four physical levels with a respective logic level of at least four logic levels, and wherein each data symbol comprises a most significant bit and a least significant bit;
• an encoder coupled with the controller and configured to invert the one or more data symbols over a signal axis at a physical level between a highest physical level and a lowest physical level of the at least four physical levels by changing a value of a bit of each of the one or more data symbols, the bit comprising the most significant bit or the least significant bit;
• and
• a transmitter coupled with the encoder and configured to transmit the data symbols, based at least in part on inverting the one or more data symbols, via the signal modulated with the modulation scheme that includes the at least four logic levels.

A method, comprising:

• receiving data symbols via a signal modulated with a modulation scheme that includes at least four physical levels, the modulation scheme relating each physical level of the at least four physical levels with a respective logic level of at least four logic levels, wherein each data symbol comprises a most significant bit and a least significant bit;
• determining that one or more of the data symbols of the signal have been inverted based at least in part on a value of a field of the signal, a value of a symbol of the signal, a value of a bit of the signal, the modulation scheme of the signal, or an indication in the signal;
• and
• re-inverting the one or more data symbols over a signal axis at a physical level between a highest physical level and a lowest physical level of the at least four physical levels by changing a value of the most significant bit of each of the one or more data symbols based at least in part on determining that one or more of the data symbols of the signal have been inverted.