high performance over this ground-to-air mobile radio channel thus requires making full and efficient use of every single transmission opportunity. To this end, this dissertation presents two system primitives that improve throughput and reduce network overhead by using recent distributed coding

to the Internet, thereby improving per-client throughput. Unlike previous heuristic approaches, we mathematically formulate the joint channel assignment and routing problem, taking into account the interference constraints, the number of channels in the network and the number of radios available at each mesh

minimum power. We analyze the throughput, delay, and power consumption of our algorithms using a prototype software implementation, an emulation of a power-controllable radio, and a detailed channel model. Our results show that the performance of multihop wireless networks in practice can be substantially

Abstract—We consider a collection of single-antenna ground nodes communicating with a multi-antenna unmanned aerial vehicle (UAV) over a multiple-access ground-to-air communi-cations link. The UAV uses beamforming to mitigate inter-user interference and achieve spatial division multiple access

wireless networks, routing must take into account radio channel access, code scheduling, and channel reservation. In this paper, we propose some heuristic routing schemes for clustered multihop, mobile wireless networks. A packet delay improvement up to fourfold has been observed in our simulations

Abstract—In this paper we consider a collection of mobile single-antenna ground nodes communicating with a multi-antenna unmanned aerial vehicle (UAV) on a multiple-access ground-to-air wireless communications link. The UAV uses beamforming to mitigate the inter-user interference and achieve

-high-frequency (UHF) and 3–30 GHz super-high-frequency (SHF) bands are used for tropospheric scatter. Although the fading effects in a mobile radio system are somewhat different than those in ionospheric and tropospheric channels, the early models are still quite useful to help characterize fading effects in mobile

Abstract-This paper studies optimum signal combining for space diver-sity reception in cellular mobile radio systems. With optimum combining, the signals received by the antennas are weighted and combined to maxi-mize the output signal-to-interference-plus-noise ratio. Thus, with cochan-ne1

Abstract- We propose a medium access control (MAC) pro-tocol for an ad hoc network of mobile wireless terminals that are equipped with multiple directional antennas. Use of direc-tional antennas in ad hoc networks can largely reduce the radio interference, thereby improving the packet throughput

In this paper, we study the correlation properties of the fading mobile radio channel. Based on these studies, we model the channel as a one-step Markov process whose transition probabilities are a function of the channel characteristics. Then we present the throughput performance of the Go