Polar codes, that have been recently introduced by Arikan, are one of the first codes that achieved the capacity for vast numerous channels and they also have low complexity in symmetric memoryless channels. Polar codes are constructed based on a phenomenon called channel polarization. This paper discusses relay channel polarization in order to achieve the capacity and show that if inputs of tw...

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 this paper, we propose two differential relaying strategies; Active User Strategy (AUS) and Passive Users Relaying Strategy (PURS), which could be used by the base-station to transmit data of two users over downlink channels in a two-user cooperative communication network. Differential schemes are used so the users do not require the knowledge of channel gains for decoding of their data. The...

Node cooperation is considered in this paper in the existence of two relaying protocols i.e. “Amplify and Forward (AF)” also called “Store and Forward (SF)” and the second relaying protocol is “Decode and Forward”. The two stated protocols are different from each other and perform different operations on received data before retransmitting to next hop. Also the selection of each protocol is var...

Abstract—Energy-efficient communication techniques play great roles in applications where devices are powered by batteries. Relaying is viewed as an energy saving technique because it can reduce the transmit power by breaking one long range transmission into several short range transmissions. TwoWay Relaying Transmission (TWRT) is expected to consume less transmit power than One-Way Relaying T...