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In this paper, wireless power transfer (WPT) strategies to maximize information throughput are studied for cooperative relay systems, where the relay has to harvest energy from radio frequency signals in order to help the source transmit information to the destination. First, the performances of three basic WPT schemes, source WPT, destination WPT, and joint source and destination WPT, is analyzed...
In this paper, time-switching based wireless powered relay systems, where the source and destination jointly transfer energy to the relay, is studied. Given a certain transmission duration, there is a time trade-off between wireless energy transfer and information cooperative transmission. Although more time for energy harvesting causes more available power at the relay, it shrinks the duration of...
Cognitive radio (CR) is a promising technology to solve the spectrum scarcity problem by enabling secondary users (SU) to utilize the spectrum holes of primary users (PU) caused by static spectrum allocation. However, SUs need to avoid the interference to PUs, imposing new challenges in routing protocol designs and throughput improvement in CR networks (CRN). In this paper we propose a cross-layer...
Deliberate clipping is a simple solution to high Peak-to-Average Power Ratio problem of OFDM signal. In Amplify-and-Forward OFDM relay networks, due to the limited resource, deliberate clipping is also suggested. However, clipping is a nonlinear process and may cause significant performance degradation. Based on Bussgang Linearization Theory, we provide a linear system model for Amplify-and-Forward...
One of the major challenges in the medium access control (MAC) protocol design over cognitive Ad Hoc networks (CAHNs) is how to efficiently utilize multiple opportunistic channels, which vary dynamically and are subject to limited power resources. To overcome this challenge, in this paper we first propose a novel diversity technology called Channel-Aggregation Diversity (CAD), allowing each secondary...
Spectrum sensing is performed by secondary users (SUs) to detect primary users (PUs) in cognitive radio networks. The limited time duration allocated for spectrum sensing may result in high false alarm probability, which always leads to low spectrum utilization and degrades the SU throughput. To overcome this problem, we propose a novel joint sensingtime adaption and data transmission (JSTA-DT) scheme...
With the explosion increasing data in Internet, high performance scalable router has become a hot spot research area both in academe and industry recently. The underlying topology is a very important fold for scalable router. In this paper, we propose a new underlying topology of the scalable router, and name it Compressed 3D-Torus (C3D-Torus). It's more like the 3D-Torus, which is a famous architecture...
The throughput of WPAN (Wireless Personal Area Network) based on Bluetooth was decided by the interference of Bluetooth piconets in the network. The interference was decided by the hamming correlation of Bluetooth FH (Frequency Hopping) selected sequence. In order to improve the WPAN throughput, the WPAN model and data packet collision model were built and the relations about WPAN throughput, the...
Automatic repeat-request(ARQ) protocols for two-way relay systems, where two terminals communicating via a relay node, are investigated in this paper. According to different feedback schedules, we propose three basic ARQ protocols to improve the link reliability for two-way relay systems, namely Relay-only ARQ (Ro-ARQ), Terminal-only ARQ (To-ARQ) and Relay-Terminal ARQ (RT-ARQ). In addition, simulation...
To improve the throughput of Bluetooth-based WPAN (Wireless Personal Area Network), the interference of Bluetooth piconets in WPAN is the important factor. It is decided by the hamming correlation of Bluetooth Frequency Hopping (FH) selected sequence. In this paper the WPAN model and data packet collision model are built and the relations about WPAN throughput, the maximum hamming correlation of FH...
A new resource allocation scheme for cooperative transmission over multiuser OFDM networks is proposed in this paper. It is assumed that each user has the ability to relay information for others to improve the overall system performance, operating in decode-and-forward (DF) mode. Sub-carriers and power are allocated to users to maximize the uplink system throughput under the constraints of half-duplex,...
Cooperative communication is an efficient solution to combat wireless channel fading and to increase system throughput in future board communication. In this paper, we consider the uplink scenario of multi-user cooperative network, in which the resource is allocated to the users with the consideration of both fairness guarantee and throughput enhancement. The system uplink throughput is optimized...
Automatic repeat-request (ARQ) protocols for two-user cooperative diversity system employing Alamouti space-time coding are investigated in this paper. A whole cooperative transmit frame of the original cooperative system consists of three sub-frames. According to different feedback schedules in a transmit frame at the destination, two basic ARQ protocols, namely post-cooperating and pre-cooperating,...
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