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This paper addresses the issue of packet scheduling with spatial division multiplexing (SDM) techniques of multiple input multiple output (MIMO) antenna in the 3GPP Long Term Evolution (LTE) downlink. Considering the restricted condition of selecting SDM techniques, a novel packet scheduling algorithm with quality of service (QoS) support in LTE downlink MIMO system, named QoS-DMO, is proposed. QoS-DMO...
Consider a distributed sensor network (DSN) with randomly deployed sensors for binary detection of a phenomenon of interest (PoI). A data fusion center (which may be a sensor itself) monitors the PoI using both the directly acquired PoI data and the wireless communication signals conveying binary decisions about the PoI from other distributed sensors. To address this problem, we look into a PoI with...
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...
In this paper, an adaptive modulation scheme for the two-way relay channel (TWRC) is proposed. The modulation used at each user is adaptively selected according to their own channel. When the channels are asymmetric, i.e., the channels are with unbalanced bit message rate, the worse channel is the bottleneck of the transmission. We propose a scheme by applying buffer technique and hierarchical modulation...
Most of existing studies about two-way relay network rely on the assumption that two sources transmit with symmetric traffics, which is often unsatisfied in practical application. In this paper, we focus on asymmetric traffics for two-way relay network, and investigate how to minimize system outage probability. To achieve this objective, we first propose a strategy to combine relay selection (RS)...
Coordinated multi-point (CoMP) processing is a key technique in next generation mobile communications. It can effectively solve the interference problem encountered in cell edges. To conduct the processing, however, base stations need to exchange users' informations, yielding a communication overhead for the backhaul. This paper considers inter-site uplink CoMP processing for multi-input-multi-output...
In this paper, we study a clustered two-hop decode-and-forward (DF) network consisting of a set of source-destination pairs, and a cluster of relays. We consider the case where channels are Rayleigh frequency selective, orthogonal frequency division multiple access (OFDMA) is employed, and there is no line of sight (LOS) between source and destination clusters. Approximating the capacity of a single...
Packet forwarding in Vehicular Networks is gathering a booming interest in research area as cooperation of nodes becomes important for such a scenario. The presence of selfish nodes reluctant to transfer data packets are the most critical concern in packet forwarding. From explanations of game theory this is a social dilemma situation that gives a suboptimal outcome from a collective standpoint. Strategic...
As a fundamental network property, Inter-Contact Time (ICT) determines the critical performance metrics of a vehicular ad-hoc network (VANET). In this paper, we extract the contact information from the traces of Global Positioning System (GPS) from public and semi-public vehicles in a large modern city, including both buses and taxis. By exploring the spatial and temporal properties of the contact...
A two-way relay underwater acoustic communication (TWR-UAC) scheme is proposed and investigated, where communication between a pair of terminals is assumed. In our studies, underwater acoustic (UA) channels are modeled as the sparse multipath channels experiencing Rayleigh fading. A novel relaying protocol is proposed to exploit the long transmission delay of sound in water. It can be shown that this...
In this paper, we consider the network-welfare optimization for a Cognitive Radio Network (CRN) consisting of multiple Primary-Users (PUs) and multiple Secondary-Users (SUs). For each pair of PU and SU, the interaction between them is modeled as a Stackelberg game where the PU shares its licensed channel with the SU by charging the interference, and the SU is allowed to access the PU channel by paying...
A Mixed Line Rate optical network is a good candidate for a core backbone network because of its ability to provide diverse line rates to effectively accommodate traffic demands with heterogeneous bandwidth requirements. Optical amplification has increased the reach of long-haul optical links. Nevertheless, it is impossible today to construct a truly optical network without converting optical signals...
Cooperative spectrum sensing has been proposed to help raise the sensitivity requirement under the fading propagation in Cognitive Radio Network. In this paper, we introduce a new explanation that the best probability of detection or false alarm can be achieved from only parts of the cooperative secondary users under different scenarios. Specifically, we analyze from the new perspective of spatially-correlated...
Survivability is one of the key issues in Fiber-Wireless (FiWi) access network since network component failure may interrupt many high-rate traffic flows, especially in the segment failure scenario. Previous works propose to protect FiWi against segment failure by deploying backup fibers among different segments. However, these works consider only single segment failure. Also, they underutilize the...
Interference alignment (IA) is a promising technique that can effectively eliminate the interference in multiuser wireless communication networks. However, in traditional IA schemes, the signal to interference plus noise ratio (SINR) may decrease greatly when the desired signal and the interference are aligned in the similar directions by IA. Consequently, the bit error rate (BER) will be large, and...
In this paper, we study how to deploy base stations (BSs) in green cellular networks, where BSs can be switched off to save energy when traffic load is low. Unlike previous studies which deploy BSs only based on the peak traffic load, our BS deployment scheme is based on the whole traffic variation process. In particular, we consider a linear cellular network where BSs are regularly deployed and users...
This paper proposes a novel edge router architecture for the 3-Level Integrated Hybrid Optical Network (3LIHON). The detailed implementations of the queue scheduling techniques, assembly algorithm, and the contention resolution mechanism are presented. We also build a network simulator to evaluate the performance of the architecture with different realistic input traffic patterns. Results show that...
The EPC-C1G2 standard is widely regarded as an international mainstream when developing RFID applications due to its major property of lightweight cost. Up to now, many RFID authentication protocols conforming to EPC-C1G2 have been proposed. In 2010, Lo and Yeh proposed an EPC-C1G2 RFID authentication protocol, and employed a formal logic proof to prove the security of their protocol. Herein, we show...
Using a Karhunen-Loève series expansion (KLSE) based quasi-analytical method for BER calculation, we investigate performance optimization for 44 Gb/s return-to-zero (RZ) partial DPSK (PDPSK) transceiver with reduced component bandwidth, where the optimization is done by pre-emphasizing the gain shape of electrical signal driving path in the transmitter and varying the free spectral range (FSR) of...
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