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 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...

Performance of multi-hop MIMO relay channels under the amplify-and-forward and decode-and-forward protocols are compared via the capacity and SNR gains. In an N hop channel of linear topology with multi-antenna source and destination and single-antenna relay nodes, the capacity gain of the DF relaying over the AF one does not exceed log2N bit/s/Hz and its SNR gain does not exceed N , for any ch...

in this paper, we consider a cooperative cognitive radio network in which there is an ofdm primary link and multiple single carrier secondary links.the primary link is required to maintain its secrecy rate above a predefined threshold. if the secrecy rate requirement is not satisfied, the secondary system help primary link to maintain its secrecy rate requirement. in doing so, the secondary trans...

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