We propose two novel schemes to level up the sum–rate for a two-tier network with femtocell where the backhaul uplink and downlink connecting the Base Stations have limited capacity. The backhaul links are exploited to transport the information in order to improve the decoding of the macrocell and femtocell messages. In the first scheme, Quantize-and-Forward, the Femto Base Station (FBS) quanti...

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 chapter, we discuss single and double-differential coding for a two-user cooperative communication system. The single-differential coding is important for the cooperative systems as the data at the destination/relaying node can be decoded without knowing the channel gains. The double-differential modulation is useful as it avoids the need of estimating the channel and carrier offsets fo...

In this paper, closed form expressions for approximate symbol error rate (SER) are obtained using moment generating function (MGF) for a two branch cooperative communication system over generalized κ−μ and η−μ i.i.d. fading channels for BPSK and QAM modulation schemes. Selective Decode and Forward protocol is used at the relay transmitter. At the destination Maximal Ratio Combining (MRC) is use...

 Abstract—In this paper optimum power allocations are derived for a fading decode-and-forward full-duplex relay channel, analytically. Individual power constraints for the source and the relay are assumed and the related optimization problem is analyzed for two scenarios. First, optimization is taken over the source power, the relay power, and the correlation coefficient between the transmitte...

In this paper, we present a novel hybrid automatic repeat request (HARQ) scheme for cooperative communication systems, called cooperative partial retransmission (CPR). The method is based on the retransmission of only a fraction of the original code word by the cooperating nodes. Based on the outage analysis, we derive the theoretical throughput expressions that are compared to numerical simula...

Cooperative diversity is a promising solution for diversity gain, multiplexing gain and energy saving. This technique involves multiple users sharing resources in order to build a virtual antenna array in a distributed manner. In this paper, we propose multi-user cooperation strategy that allows multiple users to transmit their data simultaneously in decode-and-forward relaying systems. We cons...

The  Question  Answer  Relationship  (QAR)  strategy  equips  students  with  tools  to  successfully decode and comprehend what they read. An action research project over 18 days with twenty-three kindergarteners adapted exposure to QAR’s “In the Book” and “In my Head” categories with similar questions for each of two popular Aesop’s fables. The challenges and outcomes are  presented  with  sp...