Transmit power allocation in SVD equalized multicarrier systems

Transmit power allocation and bit loading are important issues in multicarrier transmission via frequency-selective channels. In this contribution, transmit power allocation schemes for BER performance improvements in a wavelet-based multicarrier transmission system with Singular-value decomposition (SVD) equalization are investigated under the constraint of a limited total transmit power. Contrary to other contributions, here the transmit power is not only adapted to the subchannels but rather to each symbol of the SVD equalized data block individually. Based on the Lagrange multiplier method, different solutions are investigated, whereby optimal but complex and suboptimal but efficient schemes are analyzed. In order to obtain numerical results, the schemes are exemplarily applicated to a time-invariant and to different time-variant channels with Rayleigh and Rice distributed path coefficients, respectively.