Mean BER minimization loading algorithm for linear precoded OFDM

Overview & Synopsis

The problem of minimization of mean bit error rate (BER) of a linear precoded orthogonal frequency division multiplexing ({LP-OFDM}) system is considered. The discrete bit loading algorithms are proposed, which minimize the mean BER of the system for a target bit rate under a peak power constraint. The results are shown for a power line communication system using a well-known multipath channel model. The other, more common, robustness optimization problem is the margin maximization. The obtained results are compared with those of the margin maximization for both {OFDM} and {LP-OFDM} schemes. It is shown that the proposed {LP-OFDM} allocation performs better than the previously published algorithms for poor SNR. Moreover, it is observed that the {LP-OFDM} allocations have lower computational complexity than the {OFDM} allocations.