Patent ID: 6154502
Filing Date: 2000-11-28
Classification: H04L

Abstract:
A method for mapping a received signal to a signal constellation comprising:mapping the received signal to a coordinate grid which has the signal constellation thereon;determining an entry in a first table corresponding to a mapped grid coordinate for the received signal;obtaining data from the entry in the first table, if the received signal is within a boundary established for the signal constellation;obtaining a pointer from the entry in the first table to point to an entry in a second table, if the received signal is on or outside of the boundary;obtaining a plurality of possible constellation points located on the boundary from the entry in the second table if the second table is used;comparing the possible constellation points in the second table entry to determine which constellation point on the boundary is closest to the grid coordinate of the received signal, when the second table is used; andusing the constellation point on the boundary closest to the grid coordinate of the received signal as an intended constellation point for the received signal to obtain data from a corresponding entry in the first table.