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Wireless transceivers; remote radio head units employed as part of a wireless network for wireless transmission and reception; microwave and millimeter wave wireless backhaul systems comprising interface units and wireless transmission and reception units; wireless, optical and digital repeaters for wireless communications; distributed antenna systems comprising host units and remote units for wireless transmission and reception; virtualization software for wireless networks to manage and share radio resources among host units and remote units in a wireless network; distributed antenna systems optimization software comprising centralized and distributed algorithms to improve wireless network quality; small cells for wireless transmission and reception; wireless signal processing in a heterogeneous network; wireless signals switching and/or routing in wireless network; transportation of wired radio signals or wireless signals in general from point-to-point, or from point-to-multipoint; real-time locating systems; re-transmission of navigation signals including those of satellites and/or other terrestrial sources