Method and apparatus for performance optimization and adaptive bit loading for wireless modems with convolutional coder, FEC, CRC and ARQ

摘要

A closed form solution is provided in a receiver, such as an OFDM receiver, including the step of determining an uncoded bit error rate (BER) at an output of a demodulator of a receiver based upon at least a target BER to be achieved after the completion of forward error correction at the receiver. In a variation, the solution is used to provide an optimum bit loading algorithm designed to meet the target BER and including the steps of: measuring a channel condition metric corresponding to a signal received from a transmitter at a receiver via a communication channel; and determining an optimum number of bits/symbol supportable by the communication channel based upon at least the measured channel condition metric and the target BER. In some variations, these closed form solutions may be performed offline and stored in the receiver as a lookup table.