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 22 for “"Pulse amplitude modulation"”.
-
The Impact of Higher Order Pulse Amplitude Modulation and Transmission Performance over Twisted Pair Cable
… has focused on the transmission of higher order Pulse Amplitude Modulation and the associated transmission performance. The central research question is:“how well can we optimize the transmission technique in order to be able to maximise the data bandwidth over Ethernet cable and, given that …
-
Design and Implementation of an Universal Lattice Decoder on FPGA
… 4-transmit and 4-receive antennas using a 4-PAM (Pulse amplitude modulation) supports 6.32 Mbit/s data rate for parallelpipeline implementation on FPGA platform, which is about two orders of magnitude faster than its DSP implementation.
-
Coherent control of dipolar coupled spins in large Hilbert spaces
… control obtained using strongly modulating pulses was sufficient to reproduce the theoretically expected behavior of the spin observables and the associated entanglement measures among the underlying qubits. We then investigate coherent control in a more complex solid-state spin system …
-
A new compound modulation technique for multi-channel analog video transmission on fiber
… and are consequently limited in the optical modulation depth (OMD) that may be used. This, in turn limits the power budget achievable, signal-to-noise ratio, and the channel capacity. In this dissertation a new analog transmission technique for multi-channel TV transmission on fiber USIng …
-
Dry and back again: characterization of desiccation-associated differentiation of leaf tissues in Craterostigma pumilum Hochst
… pumilum. Detailed phenotypic observation and pulse-amplitude-modulation fluorometry were used to identify the critical water contents at which key physiological changes occur in leaves of C. pumilum and how this relates to desiccation-associated differentiation between leaf Tip and Base …
-
Novel optical communications and imaging enabled by CMOS interfaced LED technology
… allow high-frequency spatial and temporal modulation of an optical signal. Contacting micro-LED arrays to complementary metal-oxide-semiconductor (CMOS) electronics provides a mm-chip-scale device with a high level of control over the optical emission through digital input. Such devices …
-
Space-Time Coding with Offset Modulations
… both cross-correlated, trellis-coded quadrature modulation (XTCQM) and continuous phase modulation (CPM). Based on these representations, both modulations can be detected with near optimal bit error rate performance using a common detector that is formulated as either an XTCQM detector, a …
-
Power allocation and linear precoding for wireless communications with finite-alphabet inputs
… inputs such as phase-shift keying (PSK), pulse-amplitude modulation (PAM), and quadrature amplitude modulation (QAM) signals. This approach, without the commonly used Gaussian input assumptions, complicates the mutual information analysis and precoder design but improves performance when …
-
Enhancing the bit error rate performance of ultra wideband systems using time-hopping pulse position modulation in multiple access environments
… designing UWB systems is choosing a suitable modulation technique. Data rate, transceiver complexity, and BER performance of the transmitted signal are all related to the employed modulation scheme. Several classical modulation schemes can be used to create UWB signals, some are more efficient …
-
Reduced Complexity Detection Methods for Continuous Phase Modulation
Continuous phase modulation (CPM) is often plagued by high receiver complexity. One successful method of dealing with this is the well-known pulse amplitude modulation (PAM) representation of CPM, which was first proposed by Laurent. It is shown that the PAM representation also applies to multi-h …
-
High-power acid Biophotovoltaic cells for the generation of green electricity
… conditioning of BPV cells was conducted using Pulse Amplitude Modulation (PAM) Fluorimetry; it is the first documented observation of short-term electrolytic potential conditioning effects on photosynthetic efficiency and associated parameters. The work in chapters 4 and 5 explores the extent …
-
High Speed Optical Links Using CAP Modulation and Novel Equalisation Techniques
… novel equalisation techniques for carrierless amplitude and phase (CAP) modulation based optical communication systems including OM4 based and plastic optical fibre (POF) based links. An 850 nm VCSEL based OM4 link using CAP-16 scheme is studied. For the first time, the CAP equaliser, is …
-
Assessing the risk of ocean acidification for scleractinian corals on the Great Barrier Reef
… the response of Acropora aspera using pulse amplitude modulation (PAM) fluorometry and oxygen respirometry under increased pCO₂ with concomitant high light conditions. The dinoflagellate density and HPLC pigment analysis are utilised to characterise the CO₂₋induced bleaching response. …
-
Polarization Division Multiplexing for Optical Data Communications
… and noise margins, including the use of pulse amplitude modulation within the two</p>channel system.</p>
-
Machine learning approach for high speed link modeling and IBIS-AMI model generation
… Volterra kernels. We applied the MPSNN to model pulse amplitude modulation 4 level (PAM-4) and non-return-to-zero (NRZ) system. Volterra kernels up to the third order can be accurately identified. The curse of dimensionality associated with Volterra series impedes the practical applications of …
-
Investigation of the pulse time modulation techniques for transmission of wideband signals
The choice of the modulation format is the principle factor in realising a highperformance bandwidth efficient communication system at an acceptable cost and complexity. Pulse time modulation technique represents an attractive alternative to purely digital or purely analogue modulation schemes …
-
SOA enhanced optical line terminal for future optical access network
… rates of 100 Gb/s per wavelength using intensity-modulation direct detection (IM/DD) and up to 400 Gb/s per wavelength using coherent technology. Achieving these targets requires overcoming the large dynamic range of burst-mode upstream packets, typically around 20.5 dB, caused by differential …
-
A novel low- cost chlorophyll fluorescence Sensor for early detection of environmental pollution
… using commercial fluorometers, such as PAM (pulse-amplitude modulation) devices, presents a challenge, since cost, complexity and the measurement methods make real-time monitoring a difficult proposition. Although such devices are high-precision instruments, they are merely able to provide …
-
Transmission Capacity Improvement for Single Photon Avalanche Diode-based Optical Communication Using PAM Modulation
… optical communication links that use intensity modulation with direct detection, the highest optical sensitivity is achieved using avalanche photodiodes. However, the excess noise generated within the avalanche photodiode (APD) limits the receiver sensitivity. Operating the APD above its …
Page 1 of 2