Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 53 for “"Multi-carrier"”.
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A Multi-Carrier Collaborative Solution to Minimize Connectivity-Loss
… to connect to other devices using a different carrier within close proximity of each other and make HTTP requests. In our results, we saw 100% success rates on HTTP requests with connected devices on a good connection. Average round trip times were tested to be as low as 1.5 seconds.</p>
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Channel Estimation in Single -Carrier and Multi-Carrier Communication Systems
… a part of daily life, new applications such as multimedia services are emerging, not just in the wired environment but also in the wireless one. In addition, there have been remarkable developments in communication technology such as turbo receivers and multi-carrier communication systems, which …
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Analysis of Jamming-Vulnerabilities of Modern Multi-carrier Communication Systems
… the jamming-vulnerabilities of the leading multi-carrier communication systems, Orthogonal Frequency Division Multiplexing (OFDM) and Single-Carrier Frequency Division Multiple Access (SC-FDMA). In order to lay the necessary theoretical groundwork, first we derived the analytical BER …
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A hybrid-structure offset-QAM filter-bank multi-carrier MIMO system
… amplitude modulation (OQAM) filter-bank multi-carrier (FBMC), has great potential for boosting the spectral efficiency (SE) and energy efficiency (EE) of future communication systems. This is due to its superior spectral localization, CP-less transmission and relaxed synchronization …
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Novel multiuser detection and multi-rate schemes for multi-carrier CDMA
… requirements must be accommodated. A suitable multiple access scheme is key to enabling wireless systems to support both the high data rate and the integrated multiple data rate transmissions with satisfactory performance and flexibility. A multi-carrier code division multiple access (MC-CDMA) …
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The Bit Error Rate (BER) Performance in Multi-Carrier (OFDM) and Single-Carrier
… the subscribers' usage.</p> <p>The OFDM, as a multi-carrier, is more complex than the single-carrier transmission scheme. However, the OFDM technique maintains better performance for high data rate in terms of bit error rate (BER). In this thesis a comparison has been presented between the …
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Spatial and temporal disaggregation of whole system energy models through exemplar local multi-carrier networks
… Cost for different technology options across multiple carriers, including both options in electrification and the use of alternative gases. This incorporates the costs and efficiencies of domestic technologies, district heating options, and the necessary levels of network reinforcement.;The …
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High performance multi-carrier technologies with expanded applicability to CDMA systems (DS-CDMA and MC-CDMA)
Code division multiple access (CDMA) has been an important component in wireless communication systems since the early 1980’s. Now the frontrunner in the 3G cellular standard, CDMA techniques have come a long way since their inception. However, these systems are not without their limitations -- …
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Sum-rate maximization in multi-RIS multi-carrier systems through active power allocation and passive beamforming
… solving the sum-rate maximization problem in a multi-RIS environment within an orthogonal frequency division multiplexing (OFDM) framework. Reconfigurable intelligent surfaces (RIS) offer low-cost and energy-efficient solutions for enhancing wireless communication. In this work, we jointly …
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Low-Complexity Iterative Receiver Design for Multi-Carrier Faster-Than-Nyquist Signaling Over Frequency-Selective Fading Channel
… efficiency of wireless communication systems. Multi-carrier faster-than-Nyquist (MFTN) signaling reduces the symbol period satisfying the Nyquist criterion in the time domain and the minimum spacing of orthogonal subcarriers in the frequency domain for remarkably improving the spectral …
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The realization of signal processing methods and their hardware implementation over multi-carrier modulation using FPGA technology. Validation and implementation of multi-carrier modulation on FPGA, and signal processing of the channel estimation techniques and filter bank architectures for DWT using HDL coding for mobile and wireless applications.
… of an Orthogonal Frequency Division Multiplexing (OFDM) transmitter and receiver on a Cyclone II FPGA chip using DSP builder and Quartus II high level design tools. The resources in terms of logical elements (LE) including combinational functions and logic registers allocated by the …
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Spectrally Modulated Spectrally Encoded Framework Based Cognitive Radio in Mobile Environment
… secondary users (SUs) are non-contiguous, and multi-carrier transmission technologies become the natural solution to occupy those non-contiguous bands.Non-contiguous multi-carrier based modulations, such as NC-OFDM (non-contiguous Orthogonal Frequency Division Multiplexing), NC-MC-CDMA …
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Reducing Multiple Access Interference in Broadband Multi-User Wireless Networks
<p>This dissertation is devoted to developing multiple access interference (MAI) reduction techniques for multi-carrier multi-user wireless communication networks.</p> <p>In multi-carrier code division multiple access (MC-CDMA) systems, a full multipath diversity can be achieved by transmitting one …
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Spectrum-Aware Orthogonal Frequency Division Multiplexing
… layer of cognitive radios using non-contiguous multi-carrier radio techniques. The practical tasks of spectrum sensing, frame detection, synchronization, channel estimation, and mutual interference mitigation are challenges in the communications and the computing fields that are addressed to …
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Statistical delay QoS driven resource allocation and performance analysis for wireless communication networks
… efficiency (EE) and EC in a single-user single-carrier communication system, is proposed and investigated, under a delay violation probability requirement and an average transmit power constraint. Formulated as a normalized multiobjective optimization problem (MOP), the problem is transformed …
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Orthogonal Generalized Frequency Division Multiplexing (OGFDM)
… as orthogonal generalized frequency division multiplexing (OGFDM) for increasing the wireless channel capacity without the need for extra bandwidth (BW) size or power consumption. The new wireless waveform (OGFDM) tends to obtain a better BW efficiency which in turn can increase highly the …
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Radio-Location Techniques for Localization and Monitoring Applications. A study of localisation techniques, using OFDM system under adverse channel conditions and radio frequency identification for object identification and movement tracking
… and direction finding system using OFDM multi-carrier communications systems. This approach takes advantage of delay discrimination to improve angle-of-arrival estimation in a multipath channel with high levels of additive white Gaussian noise. A new methodology is interpreted over the …
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Advanced Orthogonal Frequency-Division Multiplexing Systems with Cyclic Prefix-Less Multiple-Input and Multiple-Output Discrete Fourier Transform Spreading and Unmanned Aerial Vehicles-Assisted Cyclic Postfixed Windowed Schemes
… of the time domain Orthogonal Frequency-Division Multiplexing (OFDM)/Cyclic Prefix (CP)-less OFDM signal and reduction of baseband signal Out-of-Band (OOB) spectral power in the vicinity of boundaries of the transmission frequency band is very much essential. In the perspective of considering the …
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Optical and Spin Properties of Defect-Bound Excitons in Semiconductors
… generalized theory of spontaneous emission from multi-carrier bound excitons. We apply this theory to the neutral-acceptor bound exciton, finding three distinct radiative lifetimes. Next, we utilize our knowledge of bound-exciton transitions to measure the spin lifetime of donor-bound electrons. …
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