This paper examines capacity scaling in asynchronous relay networks, where L single-antenna source-destination terminal pairs communicate concurrently through a common set of K single-antenna relay terminals using one-hop relaying. In the perfectly synchronized case, assuming perfect channel state information (CSI) at the relays, the network capacity is known [1] to scale (asymptotically in K f...

This paper investigates the benefits that cooperative communication brings to cognitive radio networks. We focus on cooperative Multiple Input Multiple Output (MIMO) technology, where multiple distributed single-antenna secondary users cooperate on data transmission and reception. Three cooperative MIMO paradigms are proposed to maximize the diversity gain and significantly improve the performa...

Title of dissertation: PRECODER DETECTION FOR COOPERATIVE DECODE-AND-FORWARD RELAYING IN OFDMA SYSTEMS Abhijit Kiran Valluri, Master of Science, 2016 Thesis directed by: Professor Richard La Department of Electrical and Computer Engineering We consider an LTE network where a secondary user acts as a relay, transmitting data to the primary user using a decode-and-forward mechanism, transparent t...

In cellular systems, virtual multiple-input multiple-output (V-MIMO) technology promises to achieve performance gains comparable to conventional MIMO. In this paper, we propose cooperative relay selection algorithm based on machine learning techniques. Willingness of user to cooperate in V-MIMO depends on his current battery power, time and day along with incentives offered by service provider....

In-band full-duplex transmission allows a relay station to theoretically double its spectral efficiency by simultaneously receiving and transmitting in the same frequency band, when compared to the traditional half-duplex or outof-band full-duplex counterpart. Consequently, the induced self-interference suffered by the relay may reach considerable levels of power, which decreases the signal-to-...

The problem of power allocation is studied for a multiple-input multiple-output (MIMO) decode-and-forward (DF) two-way relaying system consisting of two source nodes and one relay. It is shown that achieving maximum sum-rate in such a system does not necessarily demand the consumption of all available power at the relay. Instead, the maximum sum-rate can be achieved through efficient power allo...

In this paper, we propose a relay strategy, which can be applied to a multi-user cooperative network. The proposed relaying scheme achieves significant reduction in the time-slots required for the relaying of the data of multiple users with small performance loss as compared to the conventional relaying scheme.