Within the last decade, however, some consensus has emerged that moderately diverse systems have high productivity and that extra diversity within such systems may yield insurance against external perturbations that might lead to a reduction in productivity.
In order to provide extra diversity, quite helpful when population is drifting to local optima, mutation operator is used.
It is shown how GO-CDM is able to exploit the extra diversity offered by the additional transmit antennas and larger bandwidth to improve the error performance while keeping the transmission and reception architectures computationally feasible.
Ideally, each additional subcarrier should bring along an extra diversity order, that is, an increase in rank R h g min by one as it is indeed the case for uncorrelated channels.
Hence, a number of single-antenna users share their antennas and transmit information jointly as a virtual MIMO system, which enables them to obtain higher data rates and extra diversity than when they operate individually.
For antenna configurations, for the sake of simplicity we consider 2D-omni SISO antennas, as further improvements are expected to increase with other configurations when providing the extra diversity.
