Marcelo Eduardo Pellenz

Pontifical Catholic University of Paraná · Polytechnic School

Direct-to-satellite Internet of Things (IoT) solutions have attracted a lot of attention from industry and academia recently, as promising alternatives for large scale coverage of a massive number of IoT devices. In this work, we considered that a cluster of IoT devices was under the coverage of a constellation of low-Earth orbit (LEO) satellites,...

Smart cities can offer a number of important and needed services for the citizens, including smart emergency services. In an emergency situation, mobile units such as police cars, fire trucks, and ambulances should move to the emergency location, thus performing an adequate care. A key question for achieving high performance in the service is to de...

Smart Utility Networks (SUN) rely on the Wireless-SUN (Wi-SUN) specification for years. Recently practitioners and researchers have considered Low-Power Wide-Area Networks (LPWAN) like LoRaWAN for SUN applications. With distinct technologies deployed in the same area and sharing unlicensed bands, one can expect these networks to interfere with one...

Smart Utility Networks (SUN) rely on the Wireless-SUN (Wi-SUN) specification for years. Recently, however, practitioners and researchers have also considered Low-Power Wide-Area Networks (LPWAN) like LoRaWAN for such applications. With distinct technologies deployed in the same area and sharing unlicensed bands, one can expect these networks to int...

Wireless Sensors Networks (WSNs) are an essential element of the Internet of Things (IoT), and are the main producers of big data. Collecting a huge amount of data produced by a resource-constrained network is a very difficult task, presenting several challenges. Big data gathering involves not only periodic data sensing, but also the forwarding of...

Wireless sensor networks (WSN) are being increasingly used for data acquisition and control of remote devices. However, they present some constraints in critical and large-scale scenarios. The main limitations come from the nature of their components, such as lossy links, and devices with power supply limitations, poor processing power and limited...

Cidades inteligentes buscam melhorar a qualidade de vida dos cidadãos por meio do uso das Tecnologias da Informação e Comunicação (TICs). Esforços vem sendo realizados para que sistemas computacionais sejam desenvolvidos para tratar os grandes problemas das cidades. Um dos serviços importantes é o atendimento a chamados de emergência (ex.: polícia...

We study the cross-layer energy efficiency of cooperative MIMO networks. At the physical layer, the transmit power determines the outage probability and the number of contending nodes per unit area. At the medium access control (MAC) layer, accessing the channel takes additional time and energy, which impacts the throughput and the energy efficienc...

We propose a fraud detection systems (FDS) for AMI based on anomaly detection on the energy consumption reports from smart meters. Fraud inspection is triggered when a discrepancy between the energy supplied by the grid and that reported by smart meters is detected. We use an innovative approach, where consumption reports registered shortly before...

The advanced metering infrastructure (AMI) is an architecture for two-way communication between electric, gas and water meters and city utilities. The AMI network is a wireless sensor network that provides communication for metering devices in the neighborhood area of the smart grid. Recently, the applicability of a routing protocol for low-power a...

Underwater acoustic networks (UAN) allow for efficiently exploiting and monitoring the sub-aquatic environment. These networks are characterized by long propagation delays, error-prone channels and half-duplex communication. In this paper, we address the problem of energy-efficient communication through the use of optimized channel coding parameter...

This paper studies the impact of the payload size in the energy efficiency of a point-to-point link in a wireless sensor network using convolutional codes. Two channel models are considered to represent distinct conditions with respect to the severity of the fading: AWGN, which only accounts for the large-scale effects; and Rayleigh, encompassing b...

This paper presents a new strategy for fraud detection in Advanced Metering Infrastructure (AMI) based on the analysis of disturbances in the pattern consumption of end-customers. The proposed strategy is based on the use of SVM (Supported Vector Machine). SVM requires labeled training data in order to define a classification function. The need of...

In this paper an optimization process to obtain the optimal code rate, SNR and modulation order for energy efficient underwater communications is presented. It was seen that it is possible to further decrease the consumption when compared to the binary case considering code rate optimization in conjunction with the selection of the optimum modulati...

Underwater sensor networks have a wide range of applications, but face great technical challenges due to the harsh nature of the acoustic channel. Moreover, most sensors are battery operated, making energy saving essential in network design. In this paper we analyze the energy consumption of an underwater network employing fountain codes, whose mai...

The Advanced Metering Infrastructure (AMI) is a fundamental component of the Smart Grid architecture. The AMI consists of a collection of Neighborhood Area Networks (NANs), which interconnects the smart meters to the utility company. In this paper, we address two important performance metrics regarding the NAN design, the topology's resilience and...

Energy efficient underwater communications systems design is a crucial task, once battery replacement may be barely feasible in this scenario. As acoustic underwater channels are usually harsher than terrestrial wireless channels, decreasing the transmission distance through a multi-hop approach is very appealing. In this sense, in this paper we an...

The Advanced Metering Infrastructure (AMI) is a key component of the Smart Grid architecture. The Neighborhood Area Network (NAN) is the portion of the AMI that enables two-way communication between electric, gas and water meters and City Utilities. Many companies are currently deploying wireless NAN architectures based on the IEEE 802.15.4g techno...

The performance of IEEE 802.11-based wireless local area networks (WLANs) depends on the channel assignment among interfering access points (APs). Due to the limited number of non-overlapping channels, severe interference scenarios may arise if no appropriated spectrum management is employed. Additionally, in dense urban areas it is usual to find w...

Many applications of wireless sensor networks require that nodes, besides monitoring a given phenomenon, must be able to detect and communicate asynchronous events (e.g. alarms), implying that they have to often listen to the medium in idle mode, which is inherently energy wasteful. In such a scenario time synchronization is crucial to efficiently...

Cognitive radio networks (CRNs) have emerged as a promising paradigm that can solve the shortage of spectrum resources, providing the ability to adapt and opportunistically exploit the spectrum holes. The rendezvous process allows cognitive users to find a common channel and establish a communication link. In this paper, we focus on the design of f...

Saving energy is vital in real-world underwater acoustic networks, since a lot of energy is spent to transmit acoustic waves and battery replacement is highly undesirable. In this paper, we study how the energy consumption of underwater acoustic communications can be reduced in order to extend the lifetime of underwater sensor nodes. We analyze the...

Underwater sensor networks have a wide range of applications, many of which do not tolerate long delays and time-consuming retransmissions. Moreover, as most sensors are battery powered, saving energy is fundamental to increase network lifetime. In this paper, we investigate the minimum energy consumption for transmitting one bit of information ove...

The purpose of the Wireless Regional Area Networks (WRANs) is to allow the use of spectrum allocated for television broadcasting in areas with sparse users, ensuring no interference with licensed operators. Cognitive radios using the IEEE 802.22 standard should monitor the environment to not cause interference in primary operators. When multiple WR...

This paper presents a widely linear equalizer in single carrier systems with frequency-domain equalization (SC-FDE) for underwater acoustic communications. The usage of this equalizer instead of its common strictly linear counterpart allows the distance between transmitter and receiver for a given transmitted power to be increased while maintaining...

We present a new strategy for channel allocation for structured wireless networks that exploits the multitude of channels offered by low-power radio technologies. It permits to use multiple channels with single-radio sensor nodes, assuming that only the sinks are multi-radio. The channel assignment strategy permits to reduce as much as possible coo...

In this paper we analyze the efficiency of cellular network designs, by taking into account the co-channel interference among cells, different amounts of available bandwidths, and frequency reuse. A realistic power consumption model is considered for the energy efficiency analysis, and for the economic analysis it is employed a model in which the t...

Monitoring and data collection are the two main functions in wireless sensor networks (WSNs). Collected data are generally transmitted via multihop communication to a special node, called the sink. While in a typical WSN, nodes have a sink node as the final destination for the data traffic, in an ad hoc network, nodes need to communicate with each...

Retransmissions due to decoding errors have a big impact on the energy budget of low-power wireless communication devices, which can be reduced by using hybrid automatic repeat request (HARQ) techniques. Nevertheless, this reduction comes at the cost of extra energy consumption introduced by the added computational load. No complete analysis of the...

In this paper we analyze the energy efficiency of multi-hop communication in wireless sensor networks when packet transmissions between adjacent nodes employ Hybrid ARQ (HARQ) with Chase combining (CC) technique under Rayleigh block-fading channels. The energy analysis can be constrained by either a target outage probability or end-to-end delay. Cl...

We propose a method for planning large mesh-based WSN with multiple sinks. The relationship between the WSN capacity, sensor power transmission and the outage probability of the path between sensor nodes and sinks is very complex. In order to reduce the problem complexity, we use a multistage approach, where sensor node clustering, sink position se...

This paper presents a lightweight data compression method for wireless sensor networks monitoring environmental parameters with low resolution sensors. Instead of attempting to devise novel ad hoc algorithms, we show that, given general knowledge of the parameters that must be monitored, it is possible to efficiently employ conventional Huffman cod...

The ability to determine in real-time the geographic location of client nodes is an important tool in wireless networks, allowing instantaneous mobile tracking, implementation of location-aware services and also efficient channel and power allocation planning. Among existing classical cooperative localization techniques for wireless networks, the m...

The coverage area of wireless sensor networks (WSN) can be extended using the mesh topology, where intermediate nodes can act as routers to create a multi-hop path between a sensor node and the gateway. The mesh topology is specially useful to deploy WSN over large areas, to support the demand for novel applications to smart grid and smart cities....

This paper studies the performance of asynchronous consensus algorithms in wireless sensors networks (WSNs). The application of such distributed consensus algorithms for the estimation of parameters or detection of events in WSNs has attracted increased attention recently. In this work the reliability of the wireless links between nodes is modeled...

In this paper we carry out an energy efficiency and economic cost analysis of different cellular network designs. Our system model considers the co-channel interference, different amounts of available bandwidths and also the reuse of frequencies. The energy efficiency analysis employs a realistic power consumption model, while the economic analysis...

The performance and complexity of turbo decoding using rate k/n constituent codes are investigated. The conventional, minimal and sectionalized trellis modules of the constituent convolutional codes are utilized. The performance metric is the bit error rate (BER), while complexity is analyzed based on the number of multiplications, summations and c...

In this paper we propose a cooperative scheme in which fixed relays operate with a higher spectral efficiency than the source. The relay transmits L times faster than the source with L times the spectral efficiency, reducing the loss inherent to the orthogonal cooperation. We assume a large scale path loss model which is capable of handling with h...

The performance of a wireless local area network (WLAN) depends on the channel assignments among interfering access points (APs). Due to the limited number of non-overlapping channels, severe interference scenarios may arise if no appropriated spectrum planning is employed. In our study we focus on WLANs scenarios where APs may belong to different...

The throughput performance of cooperative repetition and parallel coding in incremental decode-and-forward is investigated. Four transmission methods are considered: parallel coding with and without distributed space-time coding (PC-ST and PC, respectively); and repetition coding with and without Chase combining at the destination (RC and SC, respe...

In this paper we propose an energy efficient image transmission strategy for wireless sensor networks, which combines wavelet-based image decomposition and cooperative communication. In the proposed scheme we use selective decode-and-forward (SDF) cooperation, so that a relay node collaborates with the source by forwarding only a lower-resolution v...

An important design goal for wireless local area networks (WLANs) is the performance. It is well known that the major issue challenge to the performance in WLANs is the wireless interference. This leads to an ambience that depends on the channel assignments among interfering access points (AP). Due to the limited number of non-overlapping channels,...

The performance of a wireless local area network depends on the channel assignments among neighboring access points (APs). The limited number of non-overlapping channels may lead to severe interference scenarios if no appropriated spectrum planning is employed. Additionally, in dense urban areas it is usual to find wireless networks scenarios with...

This paper investigates the use of ensembles of artificial neural networks in predicting long-term Internet traffic. It discusses a method for collecting traffic information based on flows, obtained with the NetFlow protocol, to build the time series. It also proposes four traffic forecasting models based on ensembles of TLFNs (Time-Lagged FeedFowa...

In this paper we propose an energy efficient image transmission strategy for wireless sensor networks, which combines wavelet-based image decomposition and cooperative communication. In the proposed scheme we use selective decode-and-forward (SDF) cooperation, so that a relay node collaborates with the source by forwarding only a lower-resolution v...

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 ex...

We propose a new distributed algorithm for optimal channel assignment in WLANs with multiple access points, applying a novel formulation for wireless networks based on Distributed Constraint Optimization Problem (DCOP). The DCOP approach allows to model a wide variety of distributed reasoning tasks of multi-agent applications. The proposed strategy...

In [14], the authors study the performance of HARQ in Rayleigh block-fading channels by means of the outage probability. They consider a block-fading channel where the channel remains constant over a block but varies independently from one block to another, and that a codeword spans over F channel blocks. The general findings are that systems using...

Truncated Type-I and Type-II HARQ schemes are compared, in terms of throughput, when incremental decode and forward relaying is used. The comparison is based on the outage analysis of both schemes. Two different scenarios are considered: ad-hoc relaying, where all users are at ground level, and infra-structured relaying, where the relay and the des...

This paper presents a methodology to synthesize MPEG-4 video traffic traces with hierarchical levels of compression. In real-time video streaming applications, scalable video transmission is employed to adjust quality of service (QoS) requirements to the available channel bandwidth. The proposed model is a very simple tool to simulate scalable vide...

A novel HARQ scheme using turbo codes is proposed. The method jointly utilizes diversity combining, partial retransmission, and power scaling. Computer simulations and density evolution analysis show that the new method outperforms equal gain diversity combining and soft information combining techniques for a wide Eb/N0Eb/N0 range.

In this paper we apply the concept of overlay cognitive radio to the communication between nodes in a wireless mesh network. Based on the overlay cognitive radio model, it is possible to have two concurrent transmissions in a given interference region, where usually only one communication takes place at a given time. We analyze the cases of wireles...

The design of a novel HARQ scheme using LDPC codes, partial retransmissions, and diversity combining is presented. The theoretical throughput of the proposed scheme is estimated by means of EXIT charts. It is shown that the proposed method outperforms the classical equal gain combining (EGC) method while requiring few more overall decoding iteratio...

In this paper we present a Type-I HARQ scheme for low density parity check codes (LDPC) using partial retransmissions and diversity combining. The proposed method divides the retransmissions in equal length sub-packets, and applies a power compensation. We demonstrate that the new scheme outperforms, in terms of throughput, the typical diversity co...

An unequal error protection scheme for Lempel–Ziv–Storer–Szymanski (LZSS) compressed data is proposed. The novel method divides the compressed data into short blocks, which allows for near-real-time operation. The error protection is obtained through the application of BCH codes and block interleavers. Compared to other methods found in the literat...

Wireless Sensor Networks (WSN) are usually a set of battery-supplied small devices. One of the main challenges in deploying WSN is to improve energy-efficiency and lifetime of the nodes while keeping communication reliability. Transmissions over the wireless channel may experience many impairments, like random noise and fading, increasing the bit e...

In this paper, we extend the interference channel with degraded message sets model by introducing multiple secondaries. The new model allows for multiple concurrent transmissions in a wireless network by employing dirty paper and superposition coding. We apply the proposed scheme to the communication between nodes in a wireless mesh network (WMN)....

The design of a novel HARQ scheme using LDPC codes, partial retransmissions, and diversity combining is presented. The theoretical throughput of the proposed scheme is estimated by means of EXIT charts. It is shown that the proposed method outperforms the classical equal gain combining (EGC) method while requiring few more overall decoding iteratio...

In this paper we extend the overlay cognitive radio model by introducing multiple secondaries. The new model allows for multiple concurrent transmissions in a wireless network. We apply the proposed scheme for the communication between nodes in a wireless mesh network. Numerical results show that considerable capacity gains are achieved when using...

Bluetooth is a promising wireless technology designed for personal ad hoc networks. This paper proposes a piconet scheduling algorithm based on the estimated channel state information. This policy is appropriate for wireless and mobile communications networks. The proposed algorithm is suitable for Bluetooth networks employing power class one devic...

This paper analyzes the effect of custom error control schemes on the energy efficiency in Bluetooth sensor networks. An analytical model is presented to evaluate the energy efficiency metric, which considers in just one parameter the energy and reliability constraints of wireless sensor networks. New packet types are introduced using some error co...

We propose a hybrid ARQ scheme using recursive convolutional codes, the turbo principle and combining diversity. While spending the same energy for transmission, the proposed scheme presents a better throughput for most of the SNR range and a smaller decoding complexity than another well-known method.

We conduct a code search restricted to the recently introduced class of generalized punctured convolutional codes (GPCCs) to find good unequal error protection (UEP) convolutional codes for a prescribed minimal trellis complexity. The trellis complexity is taken to be the number of symbols per information bit in the minimal trellis module for the c...

We propose the application of the overlay cognitive radio model to the communication of links within a wireless mesh networks. Based on the communication paradigm proposed by Jovicic and Viswanath, it is possible to have two concurrent transmissions in a given interference region. As as result, considerable network capacity gains are achieved. For...

In this paper we apply the concept of overlay cognitive radio to the communication between nodes in a wireless mesh network. Based on the overlay cognitive radio model, it is possible to have two concurrent transmissions in a given interference region, where usually only one communication takes place at a given time. We analyze the cases of wireles...

A new space diversity scheme for frequency selective channels is proposed. Split-ST-OFDM makes use of split processing to improve the performance of regular ST-OFDM. The novel approach is shown to be more general than the case where the Hadamard transform is used to explore the multipath diversity inherent to the frequency selective channel. Comput...

The next generation of wireless communications systems will likely incorporate MIMO techniques in order to provide higher data rate multimedia services. Moreover, the transmission control protocol (TCP) is generally employed at the transport layer for reliable data communication. Thus, the optimization of TCP/RLP performance over MIMO systems is cu...