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Femtocell is one of the micro base station technologies, use low power levels and operates in licensed spectrum and connected to the Internet with backhaul networks, which is used to expand the coverage and increase capacity, and the installation is auto configuration. The basic of this technology is due to the difficulties of mobile user to get the best signal from base station, one of them is the...
The transmission rate of visible light communications (VLC) remains low as the low modulation bandwidth performance of light emitting diode (LED). This paper proposes a transmission system consisting of multiple LEDs and a photodiode (PD) to increase the transmission rate. We combines the radio superposition coded modulation (SCM), interleave division multiple access(IDMA) technology with VLC. To...
Modern FPGA devices, with high-speed multi-gigabit transceiver resources, together with great amount of logic gates, clock conditioning modules, availability of RAM memory blocks and re-programmability on the field, are among the most widely used electronics components in the Trigger and Data Acquisition systems in High Energy Physics (HEP) experiments.
A Wireless Sensor Network (WSN) is a self-governing network of sensor nodes organized in autonomous manner to monitor the region; connected using wireless links. Each node communicates with the other neighbor nodes, which lie in its transmission range and the entire region monitored by the combined effort of all the sensor nodes in the network, are termed as coverage area. The purpose of sensor nodes...
Home automation and smart grid development is motivated by many advantageous situations that include the demands on renewable energy and the advantages provided by power line communications technology (PLC). The integration of solar energy into conventional grid implies the control of different modules included in the system. Remote control seems to be the control mode by excellence, in which communication...
In an evolutionary metro network scenario, it is proposed to adopt flexi-grid technologies and centralize the IP functionality, locating the Broadband Remote Access Servers (BRASes) in fewer sites of a regional photonic mesh network, in order to reduce CapEx. Therefore, cost-effective data plane solutions, able to support multiple low bit rate connections, using 12.5 GHz channels, are required for...
In this paper, we discuss practical approaches for realtime/error-free 100-Gbit/s transmission using photonically-assisted signal generation and modulation techniques at 300 GHz, and demonstrate some of our recent approaches towards this target.
Error-free wavelength-preserved RZ-to-NRZ format conversions at 25, 50, and even 100 Gb/s are demonstrated using optical filter based spectral slicing. The converter is shown to be feasible for RZ signals of different duty cycles.
This paper demonstrates DAC based 56Gbaud PDM-QPSK transmission for 200Gbit/s, which provides a spectral efficiency of 4 bit/s/Hz on the 50GHz grid. Compared with 32Gbaud-16QAM, it has a better transmission performance.
This paper presents an experimental comparison of optical orthogonal frequency division multiplexing (OFDM) approaches in visible light communications (VLC). We demonstrate that OFDM schemes with asymmetric signals suffer from baseline wander in practical transmission experiments, which degrades the overall bit-rate performance. Several schemes that combat this effect are reported and the performances...
An underwater acoustic orthogonal frequency-division multiplexing (OFDM) system for short range application, which employs adaptive transmission technique to improve its performance is presented. Firstly, new channel parameters that can provide information on the instantaneous state of the channel with respect to the receiver's movement are derived. Secondly, the new channel parameters are used to...
In this paper, a new approach is considered, which are different categories to reduce the bits error rate and PAPR reduction, utilizing single carrier frequency division multiple access SC-FDMA and orthogonal frequency division multiple access OFDMA. This paper discusses the appropriateness of using OFDMA or SC-FDMA in the uplink for high-data-rate, considering a target performance metrics the PAPR...
The channel quality indicator (CQI) feedback is an essential technique in describing channel state information, especially at high-speed mobility for LTE and LTE-A systems. The number of reported CQI feedback increases when a large number of users are served by eNodeB. However, this feedback inevitably entails uses and can lead to severe degradation in system throughput. Therefore, an appropriate...
The energy consumed by the links of a Network-on-Chip (NoC) accounts for a significant fraction of the overall energy budget in a multi/many-core system. Reducing voltage of the links allows to save energy but at the cost of an increase of the bit error rate (BER). Since different communications might have different reliability (i.e., BER) requirements, in this paper we present a new mapping technique...
This paper introduces an adaptive hybrid SFH/TSS/DPSK spread spectrum system with separated interference detector. The basic working principles and architecture of the system are explained. The theoretic BER (bit error rate) of the system is estimated and compared to the classic DS/BPSK system in the presence of interference. Simulation results show that the anti-jamming capability of the adaptive...
Network selection scheme is important for providing different services, satisfying various QoS requirements, achieving seamless mobility and load balancing in heterogeneous wireless networks, which consist of the integration of various wireless networks especially Wi-Fi (WLAN) and 3G/B3G cellular networks. In this paper, a traffic differentiation-based network selection scheme is proposed in the heterogeneous...
The rise in demand for wireless communication has led to an increase in bandwidth usage. The tendency for this bandwidth to become congested has given rise to the development of modulation and coding schemes to better maximize it. The relative spectral efficiency of these schemes in a bid to assess their frequency maximization capacity is analyzed and studied using the Bit Error Rate (BER) performance...
In this paper, we propose a bandwidth efficient distributed network code, termed superimposed adaptive network coded cooperation (SANCC), for a network consisting of M users sending different information packets to a common destination through independent block fading channels. Different from conventional cooperative communications with half-duplex constraint, our proposed approach does not reduce...
This paper deals with the bit error rate (BER) semi-analytical prediction in a turbo coded digital communication system. We propose a new prediction method which is based on the kernel estimator of the probability density function (pdf). We assume that no knowledge on the distribution of the received soft samples is available. In the proposed method, we derived a new expression of the smoothing parameter...
Non-Coherent Autocorrelation (AR) UWB receivers are preferred over coherent UWB receivers because it requires no channel state information (CSI) and hence is less complex in nature. The paper investigates the performance of Transmitted Reference (TR) and Differential Transmitted Reference (DTR) scheme using AR UWB receivers. Theoretical analysis of BER performance of non-coherent IR-UWB receivers...
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