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This paper presents an application-specific instruction-set processor (ASIP) for multiuser multiple-input multiple-output (MU-MIMO) broadcast precoding. The ASIP is designed for a base station (BS) with four antennas to perform user scheduling and precoding. Transport triggered architecture (TTA) is used as the processor template and high level language is used to program the ASIP. Several special...
This paper presents simulation results of a dual-polarized 2×2 element sub-array antenna element at 15 GHz center frequency. The basic idea is to use two waveguides stacked on in a right-angle configuration to excite the orthogonal polarizations by using radiating slots. Above the slots, 4 parasitic patches are set to a form of 2×2 element sub-array. Antenna presents −10 dB impedance bandwidth from...
The existing electric grid system in Brazil is facing many challenges and this encourages the roll out of smart grid systems to reinforce the existing grid system. In this context, energy companies are seeking for solutions and applications to grow and expand their network improving reliability and coverage. One of the key technologies of smart grid is a two-way communication between smart grid components...
Mixed reality services promise to enhance our lives by providing us with real-time immersive media and contextual information delivered through lightweight wireless head mounted displays. We introduce a perception based mixed reality video streaming platform that reduces the data rate requirements for such services from several Gbps to 100 Mbps over a network that supports a 10 ms Round-Trip-Time...
Massive MIMO (MaMIMO) is a key technology for 5G wireless communication, enabling large increase in both spectral and energy efficiency at the same time. Before it can be deployed, it is important to find efficient implementation strategies. Because of the many antennas, an essential part of decreasing complexity, and further improving energy efficiency, is optimization of the digital signal processing...
In this paper, we design a pilot structure in an orthogonal frequency division multiplexing (OFDM) system for high-speed railway (HSR). Ergodic capacity is derived and its lower bound is obtained in closed form. Two schemes of pilot placement in time and frequency domains are proposed which maximizes the lower bound of the ergodic capacity. The ergodic capacities of the two proposed schemes are obtained...
Fifth generation (5G) communication systems include enhanced mobile broadband, massive machine-type communication, and ultra-reliable low-latency communication. To support various 5G applications, researchers have considered multiple scalable subcarrier spacing and transmission time interval (TTI). In this paper, we introduce a concept of waveform multiplexing for frequency multiplexing of numerologies...
Doubly selective channels or time-varying multipath channels occur when communication systems are expected to work in a highly mobile environment. The estimation and the subsequent equalization of such channels is a non-trivial task. Thus, a channel estimation scheme that is robust, precise and works with a complexity that is applicable for consumer applications is vital to overcome the effects of...
The next generation of mobile networks, 5G, is currently under development by the industry, academia and international standard organizations. The key drivers of 5G are to provide incomparable more capacity (1000×), extremely lower latency (sub-millisecond) and to accommodate ‘any’ type of user (e.g. machines) in the network. Software-defined networking (SDN) and network function virtualization (NFV)...
This paper analyzes the effective capacity (EC) of delay constrained machine type communication (MTC) networks operating in the finite blocklength (FB) regime. First, we derive a closed-form mathematical approximation for the EC in Rayleigh block fading channels. We characterize the optimum error probability to maximize the concave EC function and study the effect of SINR variations for different...
Dynamic time-division duplexing (TDD) is considered a promising solution to deal with fast-varying traffic often found in ultra-densely deployed networks. At the same time, it generates more interference which may degrade the performance of some user equipment (UE). When base station (BS) utilization is low, some BSs may not have an UE to serve. Rather than going into sleep mode, the idle BSs can...
The D2D communication has high potential to serve multiple users with high data rate within a proximity in the next generation cellular networks. In this paper, we consider a multicast scenario of D2D users where each user wishes to receive the same multicast data at varying data rates. Based on our best knowledge, finding an optimal solution to satisfy the user request in the said context requires...
The convergence of multiple service demands and different user types on a single physical layer can be enabled by dynamically reconfigurable time-division multiplexing (TDM) dense wavelength division multiplexing (DWDM) long-reach passive optical networks (PONs). In this paper we demonstrate two TDM-DWDM PON designs, the first one for densely populated urban areas and the second one better suited...
The fifth generation of mobile networks (5G) and the internet of Things (IoT) impose very stringent requirements to the optical transport networks. On the one hand, high flexibility, ultra-low latency and high capacity, in order to support the forecasted 1000x growth in mobile data traffic with latencies below millisecond. On the other hand, massive edge and core cloud infrastructure integrated with...
5G networks are supposed to offer a high flexibility in a several ways. In this regard, a twofold split of the processing in the radio access network is under discussion: A control plane / user plane split to support the software defined networking principle and a radio protocol stack layer based split to allow a flexible placement of processing functions between a central and distributed units. In...
The goal of this paper is to provide a comprehensive overview of the coexistence nature of wireless technologies most likely to be found in medical scenarios' environment. The diversity and number of these technologies is increasing constantly leading to potential interference problems and performance degradation of wireless medical applications which are expected to become popular in 5G systems....
In next generation of mobile networks, the 5G, millimeter-wave communication is considered one of the key technologies. It allows high data rate as well as the utilization of large antennas for massive multiple-input-multiple-output (MIMO) and beamforming. However, it is mandatory that transmitter and receiver perform a training of their beams in order to gain all the benefits of a large array gain...
This paper presents a link performance study for mmWave systems at 60 GHz. The study is based on mmWave wireless modem measurements. The system performance is characterized by means of common metrics such as packet delivery rate, Signal to Noise Ratio (SNR) and throughput. The effect of spatial and polarisation diversity/multiplexing is explored, considering various modulation and coding schemes (MCS)...
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