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In this paper, we study an optimization algorithm for beamforming with superposition coding (SCBF) and its application to multiple antenna satellite communication systems. Motivated by the channel asymmetries that are caused by both the variability of the physical channel conditions and the heterogeneity among the satellite terminals, we propose to implement SCBF in the forward link of a multi-beam...
In this paper, we propose the use of OFDM-CDMA based transmission schemes to support Variable Bit Rate (VBR) services at the physical layer of Digital Video Broadcast Satellite Handheld (DVB-SH)-A architecture. For this purpose, multicarrier schemes namely Spread Orthogonal Frequency Division Multiplexing (SOFDM), Complementary Code Keying (CCK-OFDM) and conventional OFDM are analyzed over integrated...
In this paper, we consider the problem of carrier allocation in Hybrid Satellite-Terrestrial Backhaul (HSTB) networks, where the satellite segment and the terrestrial backhaul network are integrated in a seamless manner. To enhance the overall spectral efficiency of the backhaul network, we consider that both terrestrial and satellite segments operate in the 17.7–19.7 GHz band, where the sharing between...
The efficient and reliable handling of numerous communicating devices responsible for the monitoring and control of the distribution grid constitutes one of the key challenges for the realization of the smart grid. Cellular technology relying on LTE-based standards has been identified as a promising option to support advanced distribution-grid operations with stringent communication requirements....
Slotted ALOHA (SA) algorithms with Successive Interference Cancellation (SIC) decoding have received significant attention lately due to their ability to dramatically increase the throughput of traditional SA. Motivated by increased density of cellular radio access networks due to the introduction of small cells, and dramatic increase of user density in Machine-to-Machine (M2M) communications, SA...
In this paper we advocate the use of device-to-device (D2D) communications in a LoRaWAN Low Power Wide Area Network (LPWAN). After overviewing the critical features of the LoRaWAN technology, we discuss the pros and cons of enabling the D2D communications for it. Subsequently we propose a network-assisted D2D communications protocol and show its feasibility by implementing it on top of a LoRaWAN-certified...
In this paper, we provide a unified framework for the study of multi-cell multi-user large-scale antenna system (LSAS) in both full-duplex (FD) and half-duplex (HD) modes of communications. Here, we employ the Poisson point process (PPP)-based abstraction model of massive-antenna base stations (BSs) and mobile terminals (MTs). The loop-back interference (LI) channels in FD mode are modeled using the...
This paper investigates the feasibility of a radio access system with a self-backhauling access node under full-duplex and half-duplex operation modes. In particular, after making certain simplifying assumptions, closed-form solutions for the feasibility conditions of such a radio access system are derived for both of the considered operation modes. Furthermore, the analysis incorporates given quality...
We consider the design of polar codes for block fading channels. The key idea is to combine modulation, fading, and coding in a single entity. This design is based on two facts: (i) for each fading block, symbols with different fading coefficient has different reliability; (ii) for each symbol, different bit levels of a high order modulation observe different noise levels. In other words, the bit...
We propose a generalized construction for binary polar codes based on mixing multiple kernels of different sizes in order to construct polar codes of block lengths that are not only powers of integers. This results in a multi-kernel polar code with very good performance while the encoding complexity remains low and the decoding follows the same general structure as for the original Arikan polar codes...
This paper introduces a class of specific puncturing patterns, called symmetric puncturing patterns, which can be characterized and generated from the rows of the generator matrix GN. They are first shown to be non-equivalent, then a low-complexity method to generate symmetric puncturing patterns is proposed, which performs a search tree algorithm with limited depth, over the rows of GN. Symmetric...
In the Cloud Radio Access Network (C-RAN) architecture, the baseband signals from multiple remote radio heads are processed in a centralized baseband unit (BBU) pool. This architecture allows network operators to adapt the BBU's computational resources to the aggregate access load experienced at the BBU, which can change in every air-interface access frame. The degree of savings that can be achieved...
The integration of both fronthaul and backhaul into a single transport network (namely, 5G-Crosshaul) is envisioned for the future 5G transport networks. This requires a fully integrated and unified management of the fronthaul and backhaul resources in a cost-efficient, scalable and flexible way through the deployment of an SDN/NFV control framework. This paper presents the designed 5G-Crosshaul architecture,...
Single Carrier Frequency Division Multiple Access (SC-FDMA) is a promising technique compared to Orthogonal Frequency Division Multiple Access (OFDMA) for uplink transmission in 3rd Generation Partnership Project(3GPP) Long Term Evolution(LTE) because of its low peak to average power ratio (PAPR). However SC-FDMA is very sensitive to carrier frequency offset(CFO), which affects the error rate performance...
Cloud Radio Access Network (C-RAN) is one of the most promising network architectures for next-generation mobile communication. Integrating multiple Base Band Units (BBUs) for signal processing in centralized BBU pools provides the opportunity to manage the utilization of processing resources more flexibly and in a more energy-efficient way. This paper demonstrates two approaches for dynamic energy...
millimeter wave (mmW) communication systems have the potential to increase data rates with low-latency, highly directional communication links. Due to the geometric nature of the propagation, mmW signals can also be used for accurate positioning. This paper explores the trade-off between communication rate and positioning quality in mmW systems. We show how rate and positioning quality interact as...
The capability of counting targets (people or things) in a monitored area is important for emerging wireless applications. To this aim, passive systems that rely on signals of opportunity and device-free targets are preferred to active systems that rely on dedicated or personal devices for preserving privacy and reducing implementation costs. This paper develops a framework for design and analysis...
In this paper we investigate the localization performance limits of massive arrays working at mm-wave frequencies and adopting two different beamforming strategies. In the first one, array weights are set in order to point towards a precise direction (classic beamforming), whereas in the second one, such weights are randomly chosen (random beamforming). Thanks to the large set of measurements as well...
The positioning support is under study within the narrowband (NB) Internet of things (IoT) standard of Long Term Evolution (LTE) cellular networks. However, the limited signal bandwidth of this technology poses serious difficulties to achieve a position accuracy below 50 meters, which may be required in current 4G and future 5G standards. This work studies the impact of a frequency-hopping (FH) scheme...
This paper introduces a paradigm shift in the way localization performance in wireless networks is analyzed. Currently, localization performance in networks is commonly benchmarked using the Cramér-Rao lower bound (CRLB), given a fixed geometry of anchor nodes and a target. By contrast, we consider networks with random geometries for which the CRLB itself becomes a random variable, and we seek a tractable...
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