We analyze the spectral efficiency performance and limits of orthogonal frequency-division multiple access (OFDMA) cognitive radios (CRs) with an imperfect availability of cross-link knowledge. In particular, in contrast to the conventional `average' and `worst' cases of channel estimation error in the literature, we propose a stochastic approach to mitigate the total imposed interference on primary users. Channel-adaptive resource allocation algorithms are incorporated to optimize the cognitive system functionality under transmit and interference power constraints. An expression for the cumulative density function (cdf) of the received signal-to-interference-plus-noise ratio (SINR) is developed to evaluate the average spectral efficiency. Analytical derivations and results are confirmed through computer simulations.
@article{arxiv.1710.08277,
title = {Spectral Efficiency of OFDMA Cognitive Radios under Imperfect Cross-Link Knowledge},
author = {H. Saki and M. Shikh-Bahaei},
journal= {arXiv preprint arXiv:1710.08277},
year = {2017}
}
Comments
arXiv admin note: substantial text overlap with arXiv:1709.04248