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 46 for “"bit error rates"”.
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Longer Term Dynamics of Bit Error Rates using Universal Software Radio Peripheral (USRP) Software Defined Radios for Indoor Environments
… modulation schemes and to compare the results of Bit Error Rate Vs Packets Received for each of the modulation scheme in the indoor environment. For this research, we used GNU radio as a simulation tool along with the USRP hardware.
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Analysis Of Time Synchronization Errors In High Data Rate Ultrawideban
… data at high speeds, exceeding hundreds of megabits per second over typical distances of 10 meters or less. The purpose of this Thesis is to estimate the timing accuracies required with such systems in order to achieve Bit Error Rates (BER) of the order of magnitude of 10-12 and thereby avoid …
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Multicarrier Wireless Systems with Adaptive Decision Combining
… is shown that such systems can provide enhanced bit error rates. However, this occurs at the cost of data throughput of the system. The typical system considered essentially involves transmission of redundant data over subsets of the total number of subcarriers available for the entire system. …
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Simulation of the error control procedures in the Xpress Transport Protocol
… This thesis presents the simulation of the error control procedures of XTP by using a simulation tool called SMURPH (System for Modeling Unslotted Real-time Phenomena), which is an object-oriented configurable simulator. Ethernet is the chosen LAN environment for the simulation of XTP in …
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NEW EDGE DETECTORS FOR CODED MARK INVERSION TRANSMISSION WITH ENHANCED PERFORMANCE
… with the analysis and measurement of the bit error rate performance of edge detectors for Coded Mark Inversion (CMI) data transmission. Chapter 1 gives the introduction to the CMI data transmission system, the motivation and the goal of the study are presented. Chapter 2 presents a general …
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Digital video transmission over wireless networks
… a difficult environment in which to deploy low bit error rate, real time services such as video. The video coding standards designed for ISDN and storage applications, were targeted at low bit error rate levels, orders of magnitude lower than the typical bit error rates experienced on wireless …
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Modeling and assessing secure Voice over IP performance
… including differing bandwidth, latency and bit error rates to evaluate the impact of security on communication quality. Results show that improving conficlentiality via encryption of conversation data packets does not introduce significant delays, but does increase bandwidth. In certain …
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An adaptive multistage interference cancellation receiver for CDMA
… A closed form expression for the probability of bit error for this adaptive multistage interference cancellation receiver is derived, using a Gaussian approximation for Multiple Access Interference (MAI). The Bit Error Rate (BER) after any stage of interference cancellation can be computed from …
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Data retrieval in MIMO systems and the effects of correlation on the channel capacity
… and the imminent effects of correlation on the bit error rates as variants of signal to noise ratio, on the retrieved data capacities of the MIMO channels created, are all examined.This is simply very important as wireless systems continue to impact on lives globally.To drive the point home, the …
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An information theoretic study of reduced-complexity receivers for intersymbol interference channels
… of such receivers have mainly focused on bit error rates in uncoded systems, this thesis takes a different approach to the problem. We adopt an information theoretic approach and study the rates that are achievable in the Shannon sense over the true channel with the given, possibly …
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Performance Study of OFDM over Fading Channels for Wireless Communications
… to the delivered signal. Quality of the signals, bit-error-rates (BERs), and peak signal-to-noise ratios (PSNRs) of the received signals are the aspects in which system performance is evaluated.</p>
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Improving packet delivery efficiency using multi-radio diversity in wireless LANs
… Local Area Networks (WLANs) often suffer from bit errors that arise from the notoriously complex and time-varying signal propagation characteristics of the wireless medium. A number of physical factors such as attenuation and multi-path are prevalent indoors and can lead to high bit-error rates …
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Error Behaviour In Optical Networks
… in these systems will be more susceptible to errors than has been the case previously. The errors observed in optical systems are investigated using the particular case of Gigabit Ethernet on fibre as an example. Gigabit Ethernet is one of three popular optical local area interconnects which …
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Digital Transmission by Hermite N-Dimensional Antipodal Scheme
… as good as filtered BPSK in practice, while the bit error rates for both modulations are identical. Hermite Keying (HK), the FM modulation version of the N-dimensional Hermite transmission, outperforms constant envelope FSK in terms of spectrum efficiency. With a simple FM detector, the bit error …
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Practical, High-Speed, Gaussian Modulated Coherent State Continuous Variable Quantum Key Distribution with Real-Time Post Processing
… utilise bulky laboratory equipment such as arbitrary waveform generators and oscilloscopes to generate and record signals. To build practical systems that can be deployed in the field, it is important to investigate the use of commercially available digital-to-analogue converters and …
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Spectral Shape Division Multiplexing (SSDM): Apparatus, Transmitter, Receiver and Detection
… sub-carriers orthogonally, SSDM allows arbitrary frequency steps enabling higher spectral efficiency. Similarly, while OFDM and other spectrally efficient methods use sinusoidal pulse forms, SSDM can use non-standard pulses providing a greater control of the carrier. In this thesis, a SSDM …
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Towards optical quantum communication in space
… To this end, we have developed a system that generates hyperentangled photonic ""ququarts'' and measures them to execute multiple quantum communication protocols of interest, including superdense teleportation and high-dimensional entanglement-based quantum key distribution (QKD). To this same …
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Coding performance on the AX.25 radio packet
… has found many wide spread applications. For error control, AX.25 packet radio currently uses the go-back-N ARQ scheme which makes no attempt to correct errors, but only re-transmits packets which have been received with errors. This can lead to a very inefficient system when the channel error …
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Analyzing Bit Error Rate using Universal Software Radio Peripheral (USRP) Software Defined Radio in Indoor and Outdoor Environments
… have adverse effects to a reliable system. Bit Error Rate has its own importance in Quality of Service (QOS). This thesis performed an analysis and measurement of bit error rates over long term scales in both indoor as well as outdoor environments with the help of Software Defined Radio’s …
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Experimental Evaluation of Convergence Layers in Delay Tolerant Networks
… these convergence layer protocols under various Bit Error Rates (BER), propagation delays and link disruption are also examined.
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