Mean BER minimization loading algorithm for linear precoded OFDM

Abstract

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.