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 74 for “"multipath fading"”.
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Performance of a wideband CDMA system under multipath fading
… is more difficult to analyze, is the effect of multipath fading, which is caused by reflections of the transmitted signal through the propagating medium to the receiver.
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Error exponents for multipath fading channels : a strong coding theorem
… strategy that achieves the capacity of the multipath fading channel under an average power constraint in the limit of infinite bandwidth. These bounds constitute a strong coding theorem for the channel as they not only delimit the range of achievable rates, but also give us a relationship …
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Intercarrier Interference Suppression for the OFDM Systems in Time-Varying Multipath Fading Channels
… its spectral efficiency and robustness over the multipath channels, orthogonal frequency division multiplexing (OFDM) has served as one of the major modulation schemes for the modern communication systems. In the future, the wireless OFDM systems are expected to operate at high …
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Small scale antenna diversity as a means of reducing the effects of multipath fading for handheld satellite communications systems
… in Clarksburg MD, to determine the impact of multipath fading upon a circularly polarized L-Band satellite-to-handheld communications system using an omni-directional antenna. A significant finding was that motion of the satellite could induce fades of up to lOdB, well in excess of the small …
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Performance of multi-user codes in wireless communications
… by a mobile station goes through different fading channels resulting. These multi-paths add constructively and destructively with different delays and attenuation at the mobile station. The autocorrelation and cross correlation properties of the Multi-user codes play a significant role in …
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An investigation into path analysis for line-of-sight microwave radio
… Paths was conducted. The causes and effects of multipath fading on the propagation of microwave signals are of particular interest here. A study is made of the theory of link engineering, including an examination of fading and distortion, and the instrumentation used in the analysis of link …
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Smart Base Station Antenna Performance for Several Scenarios - an Experimental and Modeling Investigation
Smart antenna systems are employed to overcome multipath fading, extend range, and increase capacity by using diversity or beamforming techniques in wireless communication systems. Understanding of the smart base antenna performance mechanisms for various environments is important to design cost …
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A Study of Spread-Spectrum Multiple-Access Communications Over Fading Channels
… multiple-access (SSMA) communications over fading channels is investigated. Nonselective, wide-sense-stationary uncorrelated-scattering time- or frequency-selective, and specular multipath fading channels are considered. Thermal noise modeled as additive white Gaussian noise (AWGN) is also …
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Performance Evaluation of a Frequency Modulated Spread-Spectrum System
… systems promise high capacity, resistance to multipath fading, and simplified frequency planning. In this thesis, we investigate the performance of a wireless local loop (WLL) system that uses the frequency modulation with the CDMA technique. The performance of the FM CDMA system is affected …
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Communication-aware motion planning in mobile networks
… that experience path loss, shadowing and multipath fading. This is a challenging multi-disciplinary task. It requires an assessment of wireless link qualities at places that are not yet visited by the mobile sensors as well as a proper co-optimization of sensing, communication and …
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An improved code rate search scheme for adaptive multicode CDMA
… improving search complexity. We also build a multipath fading channel with Rayleigh distribution. In the design of the channel model, our focus is given to the description of Doppler filter which is the essential part of the channel model.
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Orthogonal Frequency Division Multiplexing Modelling
… multicarrier techniques that are immune to fading produced by transmission of more than one route at a time and also resistant to intersymbol interference. OFDM is one of the popular and highly recommended modulation schemes for LTE applications. OFDM is used for communications and is found …
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Weak GPS Signal Acquisition Using Antenna Diversity
GNSS Acquisition in fading and attenuated environments is challenging. In these situations, additional processing gain is required. A common method is to extend the coherent integration time. However, in weak signal situations, using only long coherent integration is limited by navigation data bit …
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Efficient narrow-band speech transmission over land mobile channels.
… with several blocks, allowing the simulation of multipath fading, Doppler shifts, line of sight propagation and shadowing, with a wide range of parameters. This was achieved through the use of variable rate and multirate digital signal processing, combined with an appropriate system design …
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The Impact of Channel Estimation Error on Space-Time Block and Trellis Codes in Flat and Frequency Selective Channels
… provide a means for combatting the effects of multipath fading without adding much complexity to the receiver. This is especially useful in the downlink of wireless systems. In this thesis we investigate the impact of channel estimation error on the performance of both STBC and STTC. Channel …
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Performance analysis of CDMA systems in multipath channels
… Two benefits of CDMA include resistance to multipath fading and graceful performance degradation in the presence of multiple access interference. These benefits have made CDMA especially attractive for cellular telephone systems and other wireless networks. This thesis project is divided …
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Two–Way Relaying Communications with OFDM and BICM/BICM-ID
… characteristics of wireless channels, fading and multipath dispersion also contribute strongly to detection errors. Therefore, this thesis is mainly concerned with designing transmission and detection schemes to provide good detection quality of TWRC while taking into account the …
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Partial DS-CDMA for mobile satellite data networks.
… and interception; and its inherent resistance to multipath fading. In this thesis we propose to use the DS-CDMA in a random access mode of operation for the mobile satellite data packet networks. First, we analyze the DS-CDMA over a multipath fading channel and develop new and accurate …
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