Systems and methods for transmitting and receiving auxiliary data
AssigneeAltera Corporation
InventorDavid Mendel
Life of this patent
Estimating the term…
Abstract
A data transmission system includes a transmitter circuit. The transmitter circuit receives regular data bits and auxiliary data bits. The transmitter circuit encodes a first subset of the regular data bits to generate a first subset of encoded data comprising pairs of symbols that are used in quadrature amplitude modulation. The transmitter circuit encodes the auxiliary data bits and a second subset of the regular data bits to generate a second subset of the encoded data comprising at least one pair of symbols that are unused for encoding by the quadrature amplitude modulation. The transmitter circuit generates a modulated output signal that indicates the first and second subsets of the encoded data using pulse amplitude modulation.
Claims20
A data transmission system comprising:
- a transmitter circuit that receives regular data bits and auxiliary data bits, wherein the transmitter circuit encodes a first subset of the regular data bits and a first one of the auxiliary data bits as a first pair of symbols in a constellation diagram used for quadrature amplitude modulation if the first subset of the regular data bits has a first predefined value and the first one of the auxiliary data bits has a second predefined value, wherein the transmitter circuit encodes the first subset of the regular data bits and the first one of the auxiliary data bits as a second pair of symbols in the constellation diagram that are unused for encoding by the quadrature amplitude modulation if the first subset of the regular data bits has the first predefined value and the first one of the auxiliary data bits has a third predefined value, and wherein the transmitter circuit generates a modulated output signal that indicates the first pair of symbols and the second pair of symbols using pulse amplitude modulation.
A data transmission system comprising:
- a receiver circuit that receives a modulated data signal and that demodulates the modulated data signal using pulse amplitude modulation to generate encoded data, wherein the receiver circuit decodes a first subset of the encoded data to generate a first subset of regular data bits having a first value and a first auxiliary data bit having a second value using first symbols in a constellation diagram that are used for encoding by quadrature amplitude modulation, and wherein the receiver circuit decodes a second subset of the encoded data to generate a second subset of the regular data bits having the first value and a second auxiliary data bit having a third value using second symbols in the constellation diagram that are unused for encoding by the quadrature amplitude modulation.
A method for transmitting data in a data transmission system, the method comprising:
- receiving regular data bits and auxiliary data bits at a transmitter circuit;
- encoding a first subset of the regular data bits and a first one of the auxiliary data bits with the transmitter circuit as a first pair of symbols in a constellation diagram used for quadrature amplitude modulation if the first subset of the regular data bits has a first predefined value and the first one of the auxiliary data bits has a second predefined value;
- encoding the first subset of the regular data bits and the first one of the auxiliary data bits with the transmitter circuit as a second pair of symbols in the constellation diagram that are unused for encoding by the quadrature amplitude modulation if the first subset of the regular data bits has the first predefined value and the first one of the auxiliary data bits has a third predefined value;
- and
- generating a modulated output signal that indicates the first pair of symbols and the second pair of symbols using pulse amplitude modulation with the transmitter circuit.
Dependencies are inferred from the claim text.