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In this work, we show that polar belief propagation (BP) decoding exhibits an error floor behavior which is caused by clipping of the log-likelihood ratios (LLR). The error floor becomes more pronounced for clipping to smaller LLR-values. We introduce a single-value measure quantifying a “relative error floor”, showing, by exhaustive simulations for different lengths, that the error floor is mainly...
Fog computing is an interesting paradigm which has drawn attention recently, based on the presence of several Fog Nodes (FNs) able to interact among each other for sharing their tasks. To boost the interactions among FNs, an Energy-Aware Offloading Clustering Approach (EAOCA) is proposed for raising the network fairness in terms of FNs' energy level. In each cluster, there is a Fog Cluster Head (FCH)...
The inherent nature of polar codes being channel specific makes it difficult to use them in a setting where the communication channel changes with time. In particular, to be able to use polar codes in a wireless scenario, varying attenuation due to fading needs to be mitigated. To the best of our knowledge, there has been no comprehensive work in this direction thus far. In this work, a practical...
The Internet of things (IoT) will entail massive number of wireless connections with sporadic traffic patterns. To support the IoT traffic, several technologies are evolving to support low power wide area (LPWA) wireless communications. However, LPWA networks rely on variations of uncoordinated spectrum access, either for data transmissions or scheduling requests, thus imposing a scalability problem...
3GPP has recently introduced new features to the long term evolution (LTE) cellular technology enabling direct vehicle-to-vehicle (V2V) communications, also known as LTE-V2V. This new technology aims at supporting a large number of applications, most of them based on the broadcasting of periodic messages by all vehicles to inform the neighborhood about relevant information such as vehicle position,...
We consider the problem of designing a cooperative multiple-input multiple-output (MIMO) wireless network, where a multi-antenna source-destination communication link is assisted by several multi-antenna amplify-and-forward (AF) relays. Assuming either full or partial channel state information (CSI) at the relays, we propose an optimization framework for joint design of the source precoder, the AF...
The emerging advances in mobile computing devices enable the adoption of new services like video over LTE (ViLTE), augmented and virtual reality, omnidirectional video, etc. However, these new services cannot be technologically achievable within the current networks without a rethink in the network architecture. A simple increase in system capacity will not be enough without considering the provisioning...
The paper presents the studies that have been led toward the integration of device-to-device (D2D) communications within LTE networks in the frame of the project ACCENT5 (Advanced Waveforms, MAC Design and Dynamic Radio Resource Allocation for Device-to-Device in 5G Wireless Networks) supported by the French National Research Agency. The solutions presented in this paper cover several aspects of D2D...
According to the World Health Organization (WHO) the population of the developed countries is rapidly ageing. Despite the perspective of a longer life is a blessing for the mankind, it also implies a growing number of elderly people who may need permanent medical monitoring and constant assistance to conduct daily activities. A viable approach to guarantee those people a good quality of life is the...
Spatially coupled low-density parity-check (SC-LDPC) codes are often thought as codes with very long block lengths. However, they can be decoded through sliding window (SW) decoders achieving near-optimal performance when the window size is a few times larger than the code syndrome former constraint length. This makes SC-LDPC codes with short constraint length suitable for low-latency transmissions,...
In the growing context of Machine Type Communications (MTC), synthesized by the concept of Internet of Things (IoT), the need of an increased coverage pushes the industrial companies to develop efficient transmission techniques. Especially, the 3rd Generation Partnership Project (3GPP) already standardized evolutions of the 2G and 4G networks to include IoT features. These new standards share the...
In this paper, we investigate the problem of cross-layer design of the link scheduling, frequency assignment and flow control in hybrid terrestrial-satellite wireless backhauling networks. Considering network limitations and requirements, the target is to maximize the traffic that can be delivered by the network in a given period of time by deciding the active backhauling links that can transmit simultaneously...
The energy efficiency (EE) maximization problem in amplify-and-forward (AF) relay-assisted downlink channels with orthogonal frequency-division multiple access (OFDMA) is studied. The power allocation is optimized together with subcarrier allocation and pairing at the relay. As the base station and the relay have individual power constraints, an alternating optimization approach is adopted to solve...
In the next few years, the development of wireless communication systems propel the world into a fully connected society where the Machine-type Communications (MTC) plays a substantial role as key enabler in the future cellular systems. MTC is categorized into mMTC and uMTC, where mMTC provides the connectivity to massive number of devices while uMTC is related to low latency and ultra-high reliability...
Wireless video distribution to multiple users suffers from the heterogeneity problem, which often results in sacrificing the video quality in order to cover a larger geographic area. The SoftCast system devised by Jakubczak and Katabi allows, in such scenarios, the delivery of a video stream with embedded graceful degradation capabilities. With the current emergence of Software Defined Radio (SDR)...
The paper proposes a fast multi-target detection technique based on simultaneous sensor data fusion for a binary wireless sensor network in a pre-deployed configuration. The synchronous binary sensors are circularly arranged in an area with the sink node on the central axis such that the line-of-sight communication dominates. All the binary sensors employed for detecting rapidly changing targets are...
In this work, we present buffer-aided physical-layer network coding (PLNC) schemes and develop novel PLNC algorithms for cooperative direct-sequence code-division multiple access systems. In the proposed buffer-aided PLNC schemes, we employ a relay pair selection algorithm to select the relay pair and the packets in the buffer entries with the best performance and the associated link combinations...
Although the base station processing and the majority of the protocols of the wireless systems are standardized by 3GPP, the receiver architecture and implementation remain vendor-dependent. The receiver design should fulfill computational efficiency requirements, and be evaluated in practical simulators or emulators that are compliant with real-world wireless standards. In this paper, we provide...
Providing services to devices with varied rate, latency and energy consumption requirements is a major challenge for 5th Generation (5G) radio access technology. Overlay transmission or non-orthogonal multiple access, wherein multiple devices with same or different service requirements use the same time-frequency resources, may overcome the poor trunking efficiency of dedicated resource allocation...
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