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 260 for “"Bit error rate"”.
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Statistical Methods of Bit Error Rate Estimation in Optical Communication Systems
This thesis describes two methods of bit error rate (BER) estimation based on statistical techniques. The first method examines the correlation between the BER and electrical characteristics of an optical receiver circuit. Low correlation is found between the receiver performance and the electrical …
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Bit error rate simulation of a CDMA system for personal communications
… to provide system designers with tools to accurately predict system performance. Analytical techniques are useful for providing general information on system performance, but may not fully capture the complexities of the mobile radio channel needed to accurately predict the performance of …
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Probability Density Function Estimation Applied to Minimum Bit Error Rate Adaptive Filtering
… usually attempt to minimize the mean square error (MSE) of some aspect of the received signal, with respect to the desired aspect of that signal. Adaptive minimization of MSE does not always guarantee minimization of bit error rate (BER). The main focus of this research involves estimation of …
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Ambient Backscatter Communication Systems: Design, Signal Detection and Bit Error Rate Analysis
… exchange among billions of battery-operated IoT devices. With its technological capability of simultaneous information and energy transfer, ambient backscatter is quickly emerging as an appealing solution for this communication paradigm, especially for the links with low data rate …
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Non-Wiener Characteristics of LMS Adaptive Equalizers: A Bit Error Rate Perspective
… of input signal statistics. LMS equalizers exhibit non-Wiener characteristics in the presence of a strong narrowband interference and can outperform the optimal Wiener equalizer in terms of both mean square error (MSE) and bit error rate (BER). There has been significant work in the past related …
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Bit error rate simulation enhancement and outage prediction in mobile communication systems
… radio communication systems. Internally generated two-ray Rayleigh fading channel models as well as imported spatially varying complex channel impulse responses can be utilized in simulations. Implementation of receiver timing jitter and timing recovery models, as well as modifications of the …
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The Bit Error Rate (BER) Performance in Multi-Carrier (OFDM) and Single-Carrier
… This technique matches well with high data rate connection and provides a higher capacity for the subscribers' usage.</p> <p>The OFDM, as a multi-carrier, is more complex than the single-carrier transmission scheme. However, the OFDM technique maintains better performance for high data rate …
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Effect of power amplifier nonlinearity on system performance metric, bit-error-rate (BER)
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Channel Impulse Response and Its Relationship to Bit Error Rate at 28 GHz
… this need increases further. After the terrorist attacks on the Pentagon, it took several days to restore communications. This is not an acceptable time frame when people's lives are at stake. Virginia Tech's Center for Wireless Telecommunication has developed a prototype of a rapidly …
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Bit error rate estimation in WiMAX communications at vehicular speeds using Nakagami-m fading model
… and unless proactive measures such as forward error control and packet size optimisation are adopted and properly adjusted, many applications cannot be facilitated at high vehicular speeds in WiMAX communications. For any proactive measure, bit error rate estimation as a function of vehicular …
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Low computational complexity bit error rate simulation for personal communications systems in multipath and fading environments
… and so performance is compared based on bit and packet error rates resulting from the simulations. The primary contribution of this thesis is the development of fast and accurate algorithms for channel simulations, and flexible structured implementation of error correction coding. …
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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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Enhancing the bit error rate performance of ultra wideband systems using time-hopping pulse position modulation in multiple access environments
… 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 than others. These schemes …
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New method of polar channel coding for reducing the bit error rate with low complexity in the F-OFDM underwater acoustic communications
… etc. However, it is characterized by a high Bit Error Rate (BER), the main obstacle of the UWA system in real applications because the sound waves are subjected to Underwater Acoustic Noise (UWAN), which is either manmade or natural. Channel coding is one of the effective BER reduction …
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Performance of GMSK and 7/4-DQPSK Modulations in Land Mobile Radio Channels
… effect of predetection filter bandwidth on the bit error rate performance of GMSK with one-bit differential detection in this environment has been analyzed. The bit error rate performance of GMSK with two-bit differential detection has also been analyzed. Numerical computation is used to obtain …
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Ofdm system cyclic prefix characteristic analaysis for wimax technology
… concept of cyclic prefix that adds additional bits at the transmitter end. The purpose of the cyclic prefix is to minimize the inter symbol interference and to improve the bit error rate. The MATLAB software is used to develop the OFDM model with cyclic prefix and analysis the performance of …
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Optimal designs for linear and nonlinear precoders and decoders
… the performance of transmission information rate and bit error rate. For linear scheme, we introduce a new criterion named weighted information rate criterion that generalizes our linear precoder and decoder optimal designs. We can obtain maximum information rate design, minimum mean-squared …
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Modeling and Analysis of the Effects of Impairments in Fiber Optic Links
… degraded system performance; for example, high bit-error-rate or power penalty. For optical communication systems, in this thesis, these impairments are categorized into four types; that is, thermal noise, shot noise, signal-dependent noise, and intersymbol interference (ISI). By using a …
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Channel Related Optimization of Wireless Communication Systems
… up to a factor 10, still retaining the same bit error performance. The effect of the number of sub-channels used in an OFDM system is analyzed with respect to resulting bit error rate. An analytical expression for the bit error rate on Rayleigh fading channels when interchannel interference, …
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