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 31 for “"Inter Symbol Interference (ISI)"”.
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A comparison of timing methods in orthogonal frequency division multiplexing (OFDM) systems
Orthogonal frequency division multiplexing (OFDM) is being used by wireless local area network (WLAN) standards, such as IEEE 802.11a, and wireless metropolitan area network (MAN) standards, such as IEEE 802.16a. OFDM is a very efficient communications scheme for wireless ADHOC networks. However, …
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Jointly optimal pre- and post-channel equalization and distributed beamforming in asynchronous bi-directional relay networks
… transceiver-relay paths being different, inter-symbol- interference (ISI) exists at both transceivers. In this work, pre- and post-channel equalization blocks are used to combat ISI. The mean-squared error of the estimated received signals at both transceivers is minimized under a total …
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Combining Channel Sounding and Guessing Random Additive Noise Decoding
… and data transmission is investigated for pilot symbol assisted modulation schemes. Using a soft-information variant of the GRAND algorithm called Ordered Reliability Bit Guessing Random Additive Noise Decoding- Approximate Independence (ORBGRAND-AI), it is shown that by accounting for the …
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Low frequency cutoff effects in fiber optic communication systems
… forward path of the information signal leads to inter-symbol interference (ISI) and degradation of the signal to noise ratio at the sampling instant in digital on-off keying (OOK) systems. The low frequency cutoffs occur as a result of the presence of power separation filters in a line wire …
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A system model for the effect of Polarization Mode Dispersion on digital modulated optical signals in single mode fibers
… in optical networks. PMD is a source of Inter Symbol Interference (ISI) and its impact increases with the transmission data rate. Since economical adaptive compensation schemes are currently unavailable, it is essential to characterize this impairment to completely understand its impact …
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Performance Study of OFDM over Fading Channels for Wireless Communications
<p>Orthogonal Frequency Division Multiplexing (OFDM) is a very efficient multicarrier technique. OFDM is used more and more in recent wideband digital communications. It has numerous advantages such as the ability to handle severe channel conditions, efficient spectral usage, reduced inter symbol …
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Study of Modulation and Error Control Coding in Thick Film Digital Magnetic Recording
… Mechanisms. These Error mechanisms are Noise and Inter Symbol Interference, ISI. The Thesis has an extensive literature survey which can be divided into four main areas: Error Control Coding, Modulation Codes, Recording Techniques and the Recording Process.<br/><br/>The theoretical and …
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Asynchronous bi-directional relay-assisted communication networks
… be viewed as a multipath channel which can cause inter-symbol-interference (ISI) in the signals received by the two transceivers. Hence, we model such a communication scheme as a frequency selective multipath channel which produces ISI at the two transceivers, when the data rates are relatively …
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Model predictive control equalization for high-speed IO links
… limitations on parallel links. However, due to inter-symbol interference (ISI) and channel discontinuities, the data rate is being limited. Equalization schemes have been developed to cope with these problems. These equalizers compensate the loss of transmission mediums, equalize for reflections …
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Blind Synchronization and Detection of Nyquist Pulse Shaped QAM Signals
… blind receiver includes the estimation of the symbol rate, the roll-off factor of the filter, the optimal sample phase, the frequency offset, the phase offset and as well as the correction of frequency and phase offsets. The blind receiver is proposed for the cognitive radio applications. …
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Energy-Efficient Switching By Band Modulation And Passive Equalization
… is used as a receiver front-end to reduce the inter-symbol interference (ISI) and suppress the phase noise (PN) without adding power budget. The device structure tradeoffs and system design optimization are also discussed.
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Radio frequency digital to analog converter
… by distortion at the data switching instants. Inter-symbol interference (ISI), imperfect timing synchronization and clock jitter are all culprits. A DAC output current controlled by an oscillating waveform is proposed to mitigate the effects of the switching distortion. The oscillating waveform …
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Constrained Linear and Non-Linear Adaptive Equalization Techniques for MIMO-CDMA Systems
… drawback of MIMO-CDMA systems is multiple access interference (MAI) which can reduce the capacity and increase the bit error rate (BER), so statistical analysis of MAI becomes a very important factor in the performance analysis of these systems. In this thesis, a detailed analysis of MAI is …
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Sum-rate optimal network beamforming and power allocation for single-carrier asynchronous bidirectional relay network
… for the end-to-end channel raises the issue of inter-symbol-interference (ISI) at the two transceivers. In a block transmission/ reception scheme, ISI leads to inter-block interference (IBI), which could result in loss in the sum-rate of the network, if it is not considered in the design of the …
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Wireless Channel Equalization in Digital Communication Systems
… reliable wireless digital communication, namely Inter-Symbol Interference (ISI), the intensity of which makes the channel noise inconsequential.</p> <p>The theoretical background for wireless channels modeling and adaptive signal processing are covered in first two chapters of dissertation.</p> …
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Prolate Spheroidal Sequence Based Transceivers for Time-Frequency Dispersive Channels
… complex sinusoids play a central role in the internals of the core building blocks. From the channel perspective, complex sinusoids constitute the fundamental effects in the wireless baseband equivalent channel model; exemplified by the time-invariant and time-varying transfer functions in …
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Molecular Code Division Multiple Access: Gaussian Mixture Modeling
… (MC), which is a bio-inspired paradigm, is a promising technique for communication in nano-network. In MC, molecules are administered to exchange information among nano-devices. Due to the nature of molecular signals, traditional communication methods can’t be directly applied to the MC framework. …
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Analysis of Atmospheric Effects Due to Atmospheric Oxygen on a Wideband Digital Signal in the 60 Ghz Band
… digital links within the 60 GHz band gained the interest of the wireless communication industry when the FCC announced that a license is not required for a wideband digital signal in this band. Previous research on 60 GHz signals focused on how much attenuation due to atmospheric oxygen exists in …
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Two–Way Relaying Communications with OFDM and BICM/BICM-ID
… communication methods have gained strong interests in academic community and been applied in various wireless communication scenarios. Among different techniques in relay-aided communication system, two-way relaying communication (TWRC) achieves the highest spectral efficiency due to its …
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Circuit and Modeling Solutions for High-Speed Chip-to-Chip Communication
… and timing jitter across high-speed chip-to-chip interconnects. Channel equalization and associated tuning schemes have been developed to target the distinct characteristics and signal degradation exhibited in the clock and data signals of multi-Gigabit/second digital communication links. Multiple …
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