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In this paper, we consider a point-to-point link between an energy harvesting transmitter and receiver, where neither node has the information about the battery state or energy availability at the other node. We consider a model where data is successfully delivered only in slots where both nodes are active. Energy loss occurs whenever one node turns on while the other node is in sleep mode. In each...
This paper describes the design and implementation of a simple chaotic communication system on FPGA using Rössler's chaotic system of equations. The system was simulated to insure proper operation, before being implemented on hardware using VHDL. Throughput of 2850 Mbps was obtained. The implementation results on Xilinx Zynq-7000 series FPGA show the feasibility of using digital hardware to implement...
The problem of cooperative spectrum leasing among multiple primary users (PUs) and secondary users (SUs) is considered. A hybrid Stackelberg-coalition formation game theoretic algorithm is proposed that enables the PUs to identify a group of cooperative SUs by looking at the reputation history of their cooperative behavior. The coalition formation approach also promotes collaboration among the SUs...
There are many research on hybrid selective-repeat ARQ method. In many previous research purposes have been to maximize a throughput on the number of messages delivered to the user. Important theoretical limits were studied under the condition that a decoding error was very small and neglected. In this research we propose the optimal type-I hybrid selective-repeat ARQ with finite receiver buffer....
In the wireless world, the devices face a unique challenge of energy scarcity. Unlike the wired systems, there is no continuous wired energy resource available to power the ongoing wireless communication. Instead, the entire system runs on wireless batteries. Taking a step further in this field, the concept of energy harvesting is introduced a while ago. This paper combines the concept of harvesting...
A potential game based distributed channel selection scheme is proposed in this paper to mitigate the flow-in-the-middle (FIM) throughput starvation problem that frequently occurs in dense wireless local area networks (WLANs). The FIM throughput starvation occurs when neighbors of a given node are not within the carrier sense ranges of each other. Since they spatially reuse the channel and at least...
Previous studies have shown that opportunistic routing (OR) can significantly improve the performance of wireless multi-hop networks, such as wireless adhoc networks and wireless sensor networks. However, most existing opportunistic routing schemes only consider node location as the priority metric in relay selection, where packets may accumulate in relays' packet buffer, especially in data intensive...
Cognitive Radio Network (CRN) is a promising wireless communication solution whereby radio resources are automatically varied to optimize performance in the changing wireless environment. Our work focuses on distributed CRN with rational and independent users. The eventual state often reached in such a system is Nash Equilibrium (NE); multiple NEs with different performance exists. In this paper we...
In this paper, an asymptotic analysis of the inversely proportional setting (IPS) of carrier sense threshold (CST) and transmission power in densely deployed wireless local area networks (WLANs) is presented. In densely deployed WLANs, CST adjustment is a crucial technology to enhance spatial channel reuse, but it can starve surrounding transmitters due to an asymmetric carrier sensing relationship...
Tactical networks are generally simple ad-hoc networks in design, however, this simple design often gets complicated, when heterogeneous wireless technologies have to work together to enable seamless multi-hop communications across multiple sessions. In recent years, there has been some significant advances in computational, radio, localization, and networking te, and session's rate i.e., aggregate...
In this paper, we propose a novel architecture for IDMA system with low latency and high throughput for the uplink multi-user wireless system. The throughput of the proposed IDMA system can be improved to about double compared to the conventional IDMA system while the hardware complexity remains unchanged. To achieve this, the proposed system utilizes the interleaver/de-interleaver-less architecture...
Energy harvesting (EH) two-hop communications are considered. The transmitter and the relay harvest energy from the environment and use it exclusively for transmitting data. A data arrival process is assumed at the transmitter. At the relay, a finite data buffer is used to store the received data. We consider a realistic scenario in which the EH nodes have only local causal information, i.e., at any...
This paper proposes a new Reverse Direction (RD) Medium Access Control (MAC) protocol to improve the throughput and energy efficiency of IEEE 802.11 Wireless Local Area Networks (WLANs). The proposed protocol allows a source device to transmit a burst of data frames to the intended destination device in a single channel access opportunity. After the successful reception of each data frame, the destination...
This paper studies a wireless network consisting of multiple transmitter-receiver pairs sharing the same spectrum where interference is regarded as noise. Previously, the throughput region of such a network was characterized for either one time slot or an infinite time horizon. This work aims to close the gap by investigating the throughput region for transmissions over a finite time horizon. We derive...
Deployment of Multiple Cognitive Radio Networks (CRNs) is a very common scenario in today's world, like in the field of defence or disaster management. In this paper, we deal with the case of multiple numbers of co-located CRNs acting as secondary network along with one primary user (PU). We study the node based throughput performance of a CRN in presence of several coexisting CRNs. We generalize...
Wireless communication systems use adaptive modulation and coding (AMC) as well as hybrid ARQ (HARQ) to mitigate the effects of time-varying and error-prone channels. In this work, we analyze the benefits of combining HARQ and AMC adopting the throughput as a unique performance measure. The analysis of block-fading channels and error-prone decoders allows us to conclude that i) adding HARQ on top...
In this work, we propose and optimize a new coding strategy designed to enhance the throughput of hybrid ARQ (HARQ) transmissions over i.i.d. block-fading channels where the channel state information (CSI) is unknown at the transmitter. Unlike in the conventional approach, where many blocks are exclusively assigned to carry the HARQ rounds of a single packet, we use a joint coding and the same channel...
In the simultaneous wireless information and power transfer (SWIPT) system, due to the broadcast nature of wireless radio, the energy receiver may act as a potential eavesdropper to eavesdrop the information sent to the information receiver. To address this issue, in this paper, we propose an optimization framework of target secrecy rate and power allocation ratio based on secrecy outage probability...
In this paper, throughput of hybrid automatic repeat request (HARQ) schemes is studied in the presence of Markovian data arrivals and statistical queuing constraints. In particular, two queuing models are considered. Specifically, when outage occurs, the transmitter keeps the packet, lowers its priority, and attempts to retransmit it later in the first queue model while the packet is discarded and...
Energy harvesting communication has raised great research interests due to its wide applications and its feasibility of commercialization. In this paper, the multiuser energy diversity is investigated in energy harvesting communication systems. Considering centralized access schemes, the scaling of the average throughput over the number of transmitters is studied, along with the scaling of corresponding...
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