Global ETD Search
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Showing 1 to 20 of 37 for “"diversity gain"”.
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The time behavior of a site diversity system
The instantaneous performance of a site diversity system is analyzed. This analysis is performed using instantaneous diversity gain (a new parameter for describing diversity performance) and the correlation coefficient. Also, a relationship between the correlation coefficient and instantaneous …
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Four Branch Diversity Combining and Adaptive Beamforming Measurements Using Mobile Arrays at 2.05 GHz
Mobile arrays employing diversity combining and adaptive beamforming techniques overcome multipath fading, improve coverage, and increase capacity in wireless communications systems. In this thesis, diversity combining and adaptive beamforming performance of different four element arrays for mobile …
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Laboratory and field trials evaluation of transmit delay Diversity applied to DVB-T/H networks
… environmental impact. The use of transmit diversity techniques with multiple antennas have long been proposed to improve the performance and capacity of wireless systems. Transmit diversity exploits the scattering effect inherent in the channel by means of transmitting multiple signals in a …
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Evaluation of coding scheme for MIMO radar
… These systems support high capacity, increased diversity and interference suppression. Recently it has been proposed MIMO constellations for Radar. MIMO Radar is not only a new research field, but also a very promising approach in terms of overcoming Radar Cross Section (RCS) fluctuations with …
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Synthesis of Optimal Arrays For MIMO and Diversity Systems
… element radiation characteristics which maximize diversity gain given a specific power angular spectrum of the propagation environment. The method numerically constructs the eigenfunctions of the covariance operator for the scenario subject to constraints on the power radiated by each antenna as …
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Wireless Cooperative Communication and Networking
<p>Cooperative communication can achieve diversity gain and increase the channel capacity. This paper proposes a novel cooperative scheme called Cooperative Step-Wise Demodulation, which utilizes low level demodulation to demodulate high level modulated signal cooperatively. This paper focuses …
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Advanced Multiple-Input and Multiple Output Technology in Wireless Communication Networks
… are studied to exploit the degree of freedom gain under a variety of proposals for future wireless networks. First, a new linear vector physical-layer network coding scheme is proposed for a MIMO two-way relay channel where the channel state information is unavailable at transmitters. We …
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Simulation of a Wireless Communication Channel to Determine a Best Topology for a Base Station Array Antenna
… high levels of interference. Even though a diversity combining scheme (MRC) was used in the simulator, the arrays provided interference rejection capabilities due to the closely spaced antenna elements. Though diversity does provide a gain in received signal, relative to the faded signal, …
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Coherent versus non-coherent space-time shift keying for co-located and distributed MIMO systems
… an attractive tradeoff between the achievable diversity gain and the transmission rate, hence having the potential of outperforming other classic MIMO arrangements. Since no inter-channel interference is imposed at the CSTSK receiver, the employment of single-stream-based Maximum Likelihood …
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Methods to reduce perturbation effects in compressive sampling
… (dCS) method is introduced as a remedy against the additive perturbation of CS. This method will cut down the noise of the recovered signal by extracting diversity gain from given measurements with virtual multiple branches of recovery. Diversity technique is commonly used in a wireless …
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Methods to reduce perturbation effects in compressive sampling
… (dCS) method is introduced as a remedy against the additive perturbation of CS. This method will cut down the noise of the recovered signal by extracting diversity gain from given measurements with virtual multiple branches of recovery. Diversity technique is commonly used in a wireless …
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Reduced Rank Adaptive Filtering Applied to Interference Mitigation in Wideband CDMA Systems
… capacity as well as spatial and/or temporal diversity for improved performance in the presence of multipath and fading channels. Furthermore, to accommodate the demand for higher data rates, fast signal processing algorithms are required, which often translate into blind signal detection and …
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Circuit-aware system design techniques for wireless communication
… to allow the nodes to achieve multiplexing gain by forming virtual arrays without coordination, or diversity gain to decrease SNR requirements. Computation and memory are offloaded from the nodes to the server, allowing less complex, inexpensive nodes to be used. We can further use this SNR …
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Performance analysis of diversity techniques in wireless communication systems: Cooperative systems with CCI and MIMO-OFDM systems
… the maximum ratio combining (MRC) and the equal gain combining (EGC) schemes to exploit the diversity gain.
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Fountain codes for the wireless Internet
… of improving both the BER performance and the diversity gain of Vertical Bell Laboratories Layered Space Time (V-BLAST) schemes, in this thesis a SLT coded V-BLAST system having four transmit and four receive antennas is proposed. Finally, A Hybrid Automatic Repeat reQuest (H-ARQ) SLT coded …
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Adaptive Arrays and Diversity Antenna Configurations for Handheld Wireless Communication Terminals
… into the performance of adaptive beamforming and diversity combining using antenna arrays that can be mounted on handheld radios. Handheld arrays show great promise for improving the coverage, capacity, and power efficiency of wireless communication systems. Diversity experiments using a handheld …
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Radio Channel Measurements and Modeling for Smart Antenna Array Systems Using a Software Radio Receiver
… delay spread, signal envelope fading, antenna diversity gain, and gain achieved through the use of a two-dimensional rake receiver. This research makes contributions to the wireless communications field through analysis, development, measurement, and simulation that builds upon past theoretical …
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3.5 GHz Indoor Propagation Modeling and Channel Characterization
… analysis. The statistical multi-antenna diversity gain was evaluated to gauge the benefit of using multi-antenna systems in an indoor environment, which has much greater spatial diversity than an outdoor environment. Measurements were compared to indoor path loss models used for WLAN …
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Analysis of a Two-Branch Maximal Ratio and Selection Diversity System with Unequal Branch Powers and Correlated Inputs for a Rayleigh Fading Channel
… an analytical framework for analyzing two-branch diversity systems for a Rayleigh fading channel. In many cases the fading received at both branches (i.e. a two-antenna element system) is correlated because of the proximity of the antenna elements to each other. It is also not uncommon for a …
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Betrachtungen zur Energieeffizienz in Funknetzwerken mit geringer Datenrate
… relaying schemes can not capitalize the spatial diversity gain. - (This manuscript is also available - in the form of a book - from Dresden: Vogt (Verlag), ISBN:3-938860-02-2)
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