Two or more antenna elements are arranged in the vertical direction to give vertical spatial adaptivity to a wireless discrete multitone spread spectrum communications system. The system is based on a combination of Discrete Multitone Spread Spectrum (DMT-SS) and multi-element adaptive antenna array...http://www.google.de/patents/US7061969?utm_source=gb-gplus-sharePatent US7061969 - Vertical adaptive antenna array for a discrete multitone spread spectrum communication system
