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 54 for “"Bit rates"”.
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State estimation of switched nonlinear systems and systems with bounded inputs: Entropy and bit rates
… systems as lower bounds on the average number of bits needed to be sent from the sensors to the estimators to estimate the states with deterministic (worst case) error bounds. Our approach relies on the notion of topological entropy and uses techniques from control under limited information. Since …
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An examination of block motion compensation algorithms for MPEG-2 and prediction of bit rates from video sequence measurements
… lead to optimum temporal compression. For fixed bit-rate encoders finding methods to predict the bit-rate from properties of the video sequence can lead to an optimum use of the transmission bandwidth. The examination of motion compensation algorithms involved examining previous algorithms. …
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Bit-rate selection in wireless networks
This thesis evaluates bit-rate selection techniques to maximize throughput over wireless links that are capable of multiple bit-rates. The key challenges in bit-rate selection are determining which bit-rate provides the most throughput and knowing when to switch to another bit-rate that would …
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Asynchronous data-dependent jitter compensation
… by lossy channels is a limiting factor in the bit rates that can be achieved reliably over serial links. This thesis explains the causes of DDJ and existing equalization techniques, then develops an asynchronous (clock-agnostic) architecture for DDJ compensation. The compensation circuit alters …
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Optimal Linear Processing for Image and Video Coding
… coding of video sequences is inefficient at low bit rates. Using a Gaussian auto-regressive model, we propose the incorporation of rate-distortion optimized filters into the DPCM loop. It is shown that these filters trade off less important spectral components of the source for significant …
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Multimedia content adaptation for internet protocol television services in the IP multimedia subsystem
… catering for the diverse range of video bit-rates and capabilities of user end-terminals.
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Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… QoS may require the support of variable bit rates on the wireless links to the individual users. Multi-rate DS/CDMA is a promising basis on which to support the variable bit rates on the individual wireless links. Currently, the study on channel estimation and multiuser detection for …
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Long distance dispersion managed soliton transmission experiments
… of existing standard fibre systems to higher bit rates is currently an important issue. The possibility of using solitons with dispersion compensation to allow an increase in data rate of existing standard fibre systems to 10Gbit/s over 5000km has been demonstrated. The applicability of this …
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Human-Centered Optimization of Mobile Sign Language Video Communication
… language video transmitted at various low frame rates and low bit rates below the current recommended video transmission standards as prescribed in the International Telecommunication Standardization Sector (ITU-T) Q.26/16 (at least 25 fps and 100 kbps); (2) investigating the relationship between …
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Efficient flooding for wireless mesh networks
… channel quality. The mechanism includes a novel bit-rate selection algorithm that trades off the speed of high bit-rates against the larger number of nodes likely to receive low bit-rates. Unusually, UFlood uses both random network coding to increase the usefulness of each transmission and …
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A hybrid system for video compression based on H.264 and JPEG2000
… be useful in reducing blocking artifacts at low bit-rates. However, blurriness and fuzzy edges, which are the artifacts of JPEG2000, replace the blocking artifacts.
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On the performance and capacity of space-time block coded multicarrier CDMA communication systems
… to transport multimedia traffics at much higher bit rates and this motivates the author to work on the suitable candidate technology, space-time block coded (STBC) multicarrier (MC-) CDMA, for next generation of wireless mobile communication systems. The thesis first investigates the bit error …
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Predictive image coding with Pseudo-Laplacian edge detector
… techniques were developed and simulated. The bit rates of all the schemes were compared and the range varied between 2.28 - 3.46 bits/pixel without further compression of the edge information bits nor the correction bits. The subjective test on the selected images obtained with the developed …
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High performance III-nitride light-emitting diodes for visible light communications and micro-displays
… demonstrated from individual micro-LED pixels at bit rates of up to 1 Gbit/s using a high-speed probe under a binary amplitude modulation scheme. To make a more practical VLC system, micro-LED devices were integrated with specifically-designed complementary metaloxide-semiconductor (CMOS) …
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Design and analysis of a high-rate acoustic link for underwater video transmission
A high bit rate acoustic link for underwater video transmission is examined. Currently, encoding standards support video transmission at bit rates as low as 64 kbps. While this rate is still above the limit of commercially available acoustic modems, prototype acoustic modems based on phase coherent …
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Ultra-long haul optical fibre transmission systems
… have allowed regenerators operating at 10 Gbit/s to become a practical reality. By augmenting such devices with optical amplifiers it is possible to greatly enhance the repeater spacing. Work detailed in this thesis has culminated in the propagation of 10 Gbit/s data over 400,000 km with a …
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Resource allocation for CDMA downlink to achieve maximum throughput
… demand is the provision of sufficiently high bit rates in severe wireless mobile channel conditions, for a multitude of services, each requiring different and perhaps even time-varying quality of services (QoS) that can be more demanding than the QoS required by today's voice service. New …
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Quantitative performance measures of color transformations in hybrid vector scalar quantization
… and human images. Additionally, multiple bit rates were examined, ranging from 10 to 100, in increments of 10. In general, the reversible YCbCr space was found to have the best performance, allowing HVSQ to outperform JPEG 2000 in most cases.
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Opportunistic Random Media Access in WLANs
… window dynamically according to the different bit rates. Thereby, the protocol can reduce collision and improve throughput significantly. The n·aditional IEEE 802.11 standards access channel with binary exponential back-off algorithm and all nodes choose the back-off interval from the same …
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High-Speed Modulation of Semiconductor Lasers and Modulators
… is commonly used in the real system at bit rates below 10 Gbit/s and has drawbacks such as chirping and low bandwidth. To improve the high-speed performance of a single laser, we intensively study the injection locking technique. It is shown that this technique greatly reduces chirping, …
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