Wireless communication method and apparatus for performing post-detection constellation correction

A receiver for correcting the phase and gain of data associated with a constellation pattern of a plurality of individual symbols received by an input to the receiver, the constellation pattern having a first quadrant union including a first quadrant and a third quadrant, and a second quadrant union including a second quadrant and a fourth quadrant, the receiver comprising:

• a symbol component divider for dividing each individual symbol into real and imaginary symbol components, the symbol divider being configured to output the real symbol components via a first output and the imaginary symbol components via a second output;
• a real component sign detector in communication with the first output of the symbol component divider for receiving the real symbol components and determining the signs of the real symbol components;
• an imaginary component sign detector in communication with the second output of the symbol component divider for receiving the imaginary symbol components and determining the signs of the imaginary symbol components;
• a quadrant union detector in communication with the real component sign detector and the imaginary component sign detector for receiving an indication of the signs of the real and imaginary symbol components of the individual symbol, the quadrant union detector being configured to identify whether the individual symbol is associated with the first quadrant union or the second quadrant union based on the received indication;
• a first absolute value unit in communication with the first output of the symbol component divider for outputting the absolute values of the real symbol components;
• a second absolute value unit in communication with the second output of the symbol component divider for outputting the absolute values of the imaginary symbol components;
• a first summer for creating a first sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the second quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the first quadrant union;
• and
• a second summer for creating a second sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the first quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the second quadrant union;
• wherein the phase and gain of data associated with the constellation pattern is corrected based on the first and second sums.

A wireless transmit/receive unit (WTRU) for correcting the phase and gain of data associated with a constellation pattern of a plurality of individual symbols received by an input to the WTRU, the constellation pattern having a first quadrant union including a first quadrant and a third quadrant, and a second quadrant union including a second quadrant and a fourth quadrant, the WTRU comprising:

• a symbol component divider for dividing each individual symbol into real and imaginary symbol components, the symbol divider being configured to output the real symbol components via a first output and the imaginary symbol components via a second output;
• a real component sign detector in communication with the first output of the symbol component divider for receiving the real symbol components and determining the signs of the real symbol components;
• an imaginary component sign detector in communication with the second output of the symbol component divider for receiving the imaginary symbol components and determining the signs of the imaginary symbol components;
• a quadrant union detector in communication with the real component sign detector and the imaginary component sign detector for receiving an indication of the signs of the real and imaginary symbol components, the quadrant union detector being configured to identify whether the individual symbol is associated with the first quadrant union or the second quadrant union based on the received indication;
• a first absolute value unit in communication with the first output of the symbol component divider for outputting the absolute values of the real symbol components;
• a second absolute value unit in communication with the second output of the symbol component divider for outputting the absolute values of the imaginary symbol components;
• a first summer for creating a first sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the second quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the first quadrant union;
• and
• a second summer for creating a second sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the first quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the second quadrant union;
• wherein the phase and gain of data associated with the constellation pattern is corrected based on the first and second sums.

An integrated circuit (IC) for correcting the phase and gain of data associated with a constellation pattern of a plurality of individual symbols received by an input to the IC, the constellation pattern having a first quadrant union including a first quadrant and a third quadrant, and a second quadrant union including a second quadrant and a fourth quadrant, the IC comprising:

• a symbol component divider for dividing each individual symbol into real and imaginary symbol components, the symbol divider being configured to output the real symbol components via a first output and the imaginary symbol components via a second output;
• a real component sign detector in communication with the first output of the symbol component divider for receiving the real symbol components and determining the signs of the real symbol components;
• an imaginary component sign detector in communication with the second output of the symbol component divider for receiving the imaginary symbol components and determining the signs of the imaginary symbol components;
• a quadrant union detector in communication with the real component sign detector and the imaginary component sign detector for receiving an indication of the signs of the real and imaginary symbol components, the quadrant union detector being configured to identify whether the individual symbol is associated with the first quadrant union or the second quadrant union based on the received indication;
• a first absolute value unit in communication with the first output of the symbol component divider for outputting the absolute values of the real symbol components;
• a second absolute value unit in communication with the second output of the symbol component divider for outputting the absolute values of the imaginary symbol components;
• a first summer for creating a first sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the second quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the first quadrant union;
• and
• a second summer for creating a second sum of the absolute values of the real symbol components identified by the quadrant union detector as being associated with the first quadrant union and the absolute values of the imaginary symbol components identified by the quadrant union detector as being associated with the second quadrant union;
• wherein the phase and gain of data associated with the constellation pattern is corrected based on the first and second sums.