We consider a combined power and rate adaptation scheme in direct-sequence code division multiple access (DS/CDMA) communications over Nakagami fading channels, where the transmission power and the data rate are jointly adapted relative to channel variations. The transmission power proportional to Gpi is allocated to the data transmission of user i, where Gi is the channel power gain for user i...

A cooperative medium access control (CoopMAC) network with randomly distributed helpers is considered. We introduce a new helper selection scheme which maximizes the average throughput while maintaining a low power consumption profile in the network. To this end, all transmissions are assumed to be performed using power control. We assume that each node can estimate the channel between itself a...

Covert communication aims to hide the very existence of wireless transmissions in order to guarantee a strong security in wireless networks. In this work, we examine the possibility and achievable performance of covert communication in one-way relay networks. Specifically, the relay is greedy and opportunistically transmits its own information to the destination covertly on top of forwarding th...

This thesis deals with the design of efficient transmission schemes for wireless interference networks, when certain channel state information (CSI) is available at the terminals. In wireless interference networks multiple source-destination pairs share the same transmission medium for the communications. The signal reception at each destination is affected by the interference from unintended s...

We introduce an efficient multiuser scheduling method using amplify-and-forward relaying in relay-aided downlink systems, consisting of one base station (BS), one relay station, and multiple mobile stations (MSs). In our scheme, the BS opportunistically selects both the transmission mode, that is, either one- or two-hop transmission, and the desired user (i.e., the desired MS). Closed-form expr...

Transmitt,er optimization techniques for maximizing the throughput of linear IS1 channels impaired by additive-Gaussian noise and crosstalk are presented. Transmitter ends of both single carrier and multicarrier transceiver structures are optimized subject to a fixed average input energy constraint. The effect of transmitter optimization on channel throughput is quantified by comparison with sc...