AN ADAPTIVE CODING SCHEME FOR OFDM WLANS WITH A PRIORI CHANNEL STATE INFORMATION AT THE TRANSMITTER

摘要

A method and a system provide adaptive coding of an Orthogonal Frequency Division Multiplexing (OFDM) signal at a transmitter in an OFDM wireless local area network (WLAN) system in which channel state information is available at the transmitter. At least one block code (201), such as a Reed-Solomon code, is selected for handling errors based on a predetermined target data rate and a predetermined packet length for the OFDM signal. A number of bits available for parity symbols that can be used for generating a selected integer number of OFDM symbols (203), and a number of erasure errors and a number of random errors over sub-carriers of the OFDM signal are determined based on the determined number of parity symbols (205). The OFDM signal is encoded based using each selected block code (207), such that the sub-carriers are ordered from a sub-carrier having a weakest channel amplitude to a channel having a strongest channel amplitude.