Patent ID: 7957474

Claim:
A method for determining a modulation of an orthogonal frequency-division multiplexing (OFDM) symbol, the method comprising: receiving the symbol; multiplying the received symbol by the conjugate transpose of an overall channel response for the symbol; applying a decision function to the result of the multiplication for a set of sub-carriers, wherein the decision function is to sum the result of the multiplication and the determination is made based on a location of a result of the sum in a real-imaginary plane, wherein the location is determined relative to boundary lines in the real-imaginary plane, where the boundary lines are set in accordance with one of: arctangent of Im(s)/Re(s), |Im(s)| n −|Re(s)| n , or |Re(s)| n −|Im(s)| n , wherein s is the result of the sum, and n is a variable; determining the modulation of the symbol in accordance with the result of the decision function; and processing a packet in accordance with the determination of the modulation.