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.
Results
Showing 1 to 20 of 23 for “"High spectral efficiency"”.
-
OWSS And MIMO-STC-OFDM: Signaling Systems for the Next Generation of High Speed Wireless LANs
… a testament primarily to their convenience, cost efficiency and ease of integration. Even now the demand for high data rate wireless communications has increased fourfold as consumers demand better multimedia communications over the wireless medium. The next generation of high speed WLANs is …
-
SPECTRALLY EFFICIENT MULTICARRIER SYSTEMS FOR FIBER-OPTIC TRANSMISSION
… research is to provide a comprehensive study of spectrally efficient multicarrier systems for fiber-optic transmission. Multicarrier optical systems partition a high-data rate digital signal in a wavelength channel into multiple subcarriers. The data rate on each subcarrier can be sufficiently …
-
All optical systems for terabit network era
… All-optical systems are presented, allowing for high spectral efficiency in future networks, from the comb sources to the optical nodes. The following manuscript firstly reports on the development of optical combs based on external modulators to provide transmitters with a large number of optical …
-
OFDM Channel Estimation with Artificial Neural Networks
… wireless standards is often preferred due to its high spectral efficiency and ease of implementation. However, data transmission via OFDM still suffers when passing through a noisy channel. In order to maximize the abilities of OFDM, channel effects must be corrected. Unfortunately, channel …
-
Novel DWT-DAPSK based transceivers for DVB-T transmission and next generation mobile networks
… field due to the explosive demands for high-speed wireless services, such as cellular video conferencing. The second generation Terrestrial Digital Video Broadcasting (DVB- T2) has been demonstrated to provide digital communication services with very high spectral efficiency and …
-
Evaluation performance of OFDM system using the selected mapping technique for WIMAX technology
… a form of multicarrier modulation technique with high spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral density, capacity to handle very strong echoes and very less nonlinear distortion are the properties of the OFDM. One major …
-
Analysis and mitigation of carrier frequency offset for uplink of OFDMA
… because of its immunity to multipath fading, high spectral efficiency and simple implementation, making it suitable for high data rate multimedia wireless applications. One of the significant drawbacks of the OFDM is its sensitivity to Carrier Frequency Offset (CFO). CFO causes Inter Carrier …
-
Structure-utilized, Adaptive, and Efficient ML-based Proportional-Fair Scheduling in MIMO Networks for Non-stationary Channels
… that the proposed method consistently maintains high spectral efficiency and fairness with rapid policy adaptation under evolving channel conditions, making it a practical solution for next-generation wireless networks.
-
High Data Rate Coherent Optical OFDM System for Long-Haul Transmission
… driven the increase in demand for bandwidth and high data rates. Optical Orthogonal Frequency Division Multiplexing is considered as a promising technology to satisfy the increased demand for bandwidth in broadband services. Optical OFDM received a great attention after proposing it as a …
-
Unilateral and multi-functional RF front-end filtering networks using spatiotemporally modulated resonators arrays
… and cost (SWaP-C) of the RFFE while maintaining high spectral efficiency and adaptability to a wide range of frequency bands, operating conditions, and application scenarios. To address these challenges, this thesis investigates spatiotemporally modulated (STM) resonators as the basis for a new …
-
Resource management for wireless communications : an energy efficiency approach
… of data, reduce energy consumption and satisfy highly demanding quality-of-service (QoS). This can be achieved by integrating the key enabling technologies such as massive multiple-input multiple-output (MIMO) (i.e., the use of a massive number of antennas to provide high spectral efficiency for …
-
High Speed Turbo Tcm Ofdm For Uwb And Powerline System
… Modulation (TTCM) is an attractive scheme for higher data rate transmission, since it combines the impressive near Shannon limit error correcting ability of turbo codes with the high spectral efficiency property of TCM codes. We build a punctured parity-concatenated trellis codes in which a TCM …
-
Decentralized Baseband Processing for Massive MU-MIMO Systems
Achieving high spectral efficiency in realistic massive multi-user (MU) multiple-input multiple-output (MIMO) wireless systems requires computationally-complex algorithms for data detection in the uplink (users transmit to base-station) and beamforming in the downlink (base-station transmits to …
-
On the Impact of Channel and Channel Quality Estimation on Adaptive Modulation
… exploits these channel variations to improve the spectral efficiency of wireless communications by intelligently changing the modulation scheme based on channel conditions. Necessarily, among the modulation schemes used are spectrally efficient modulation schemes such as quadrature amplitude …
-
Capacity-approaching data transmission in MIMO broadcast channels
… as a critical system design problem for future high-speed packet networks requiring extremely high spectral efficiency. Our aim is to illustrate the interaction between transmission schemes at the physical layer and scheduling algorithms at the medium access control (MAC) layer from a …
-
Generalized discrete Fourier transform with non-linear phase : theory and design
… scenarios investigated. It is also highlighted how known constant modulus code families such as Walsh, Walsh-like and other codes are special solutions of the GDFT framework. In addition to theoretical framework, practical design methods with computationally efficient implementations …
-
Sphere detection and LDPC decoding algorithms and architectures for wireless systems
Ever increasing demand for high data rate wireless transmissions with high spectral efficiency leads to utilization of communication systems with multiple transmit and receive antennas. In addition, excellent error-rate performance can be achieved with iterative receiver structure composed of inner …
-
Advanced technologies in molecular and wireless communication networks: analysis, design, and optimisation
… serving many devices simultaneously, providing high per-user data rate, and serving realtime applications. Cell-free massive multiple-input multiple-output (MIMO), where many access points (APs) coherently serve all users in the networks, is one potential candidate as it can offer very high …
-
Efficient baseband design and implementation for high-throughput transmitters
… are accelerating into the realm of higher data rates from hundreds of megabits to tens of gigabits per second. Increase in data rate requires higher throughput and higher utilization of spectral bandwidth. At the same time, we are seeing a demand for smaller chipsets with lower power …
-
Multilevel Nyquist-WDM Ultra-Long-Haul Coherent Optical Transmission Systems
… of new multimedia services, like the high-definition streaming television, determines a constant increase in the demand of high-speed connectivity. This scenario requires a permanent update of the data capacity in local access networks. Nevertheless, a proper capacity upgrades plan, …
Page 1 of 2