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 138 for “"Bit Error Rate (BER)"”.
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The Bit Error Rate (BER) Performance in Multi-Carrier (OFDM) and Single-Carrier
… communication tools has escalated the number of mobile subscribers from almost 700 million in 2000 to more than 4 billion in 2009. The huge number of subscribers has led to several issues with how service is provided. The high user demand has forced developers to overcome the problems of …
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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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All-optical 2r regenerator based on self-phase modulation
… modulation (SPM) in a single highly nonlinear fiber (HNLF) with 2500 km length of transmission is investigated. In addition, there are two types of modulation format namely, non-return�to-zero on-off keying (NRZ-OOK) and return-to-zero on-off keying (RZ-OOK) were investigated. Both of these …
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Cooperative relaying using USRP and GNU radio
… enhances the signal quality. We implement this strategy using GNU Radio and three Radios (USRP-Universal Software Radio peripheral) which act as a Transmitter, a Receiver and a Relay. Our main goal is to verify the communication in between the two Radios (a Direct Link) and implement Cooperative …
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Full-Surface Data Storage
… and the resulting systems analyzed for bit error rate (BER) performance under varying data density and noise levels. A multitrack Viterbi algorithm (MVA) performs well; however, the computational complexity limits the achievable data density. Equalization methods are introduced to …
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Quantitative Interference and Capacity Analysis of Broadband Multi-Hop Relaying Networks
This thesis analyzes the Bit Error Rate (BER) performance of Orthogonal Frequency Division Multiplexing (OFDM) systems in mobile multi-hop relaying channels. We consider the uplink scenario and quantify the effects of mobile channel impairments such as Doppler Shift due to user mobility per hop, …
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The effect of on-chip ESD protection on reliable high-speed I/O link equalization power consumption
… reasons, the magnitude of the parasitics generated by electrostatic discharge (ESD) protection devices has become budgeted. Such budgets restrict the protection level and implementation options of the ESD protection circuit designer. In this work, the ESD protection on high-speed serial I/O …
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Performance evaluation of nonlinear satellite link by computer simulation
… In the simulation, the pseudo randomly generated input data stream modulates the carrier and this modulated carrier passes through the typical satellite communication link, that consists of a transmit earth station, a satellite transponder, and a receiving earth station. All the signals used …
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Data Rate Enhancement in Ultrasonic Data Telemetry Links
… a novel technique for the enhancement of data rate in wireless data transfer through ultrasonic telemetry links. Referred to as INtervened-Timing, Enhanced-Rate Interval Modulation (INTERIM), the proposed technique is an isochronous pulse-based modulation technique, which embeds the telemetered …
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Improved successive interference cancellation schemes using selective pre-cancellation and cross- correlation
… The limiting factor on capacity is not only the bit-error-rate (BER), but also the computation complexity and processing time. Interference cancellation (IC) schemes allow BER improvement at the cost of processing time and complexity. We propose an alternate implementation called …
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Performance of multi-user codes in wireless communications
… and their performance is evaluated based on the Bit Error Rate (BER). The performance for the Multi-user codes is compared both in synchronous and asynchronous mode of transmission to the base station. The model used for simulating multipath fading channel is Clark model.
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Physical layer DSP design of a wireless gigabit/s indoor LAN
The Wireless Gigabit/s Local-Area Network (WGLAN) project is aimed at providing highspeed data transmission between the Next Generation Internet and end-use devices within the home or office environment. The design of the digital signal processing (DSP) required at the physical layer of the network …
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New hybrid automatic repeat request (HARQ) scheme for 4x4 MIMO system, based on the extended alamouti quasi-orthogonal space-time bloc coding (Q-STBC), in invariant and variant fading channel
… the SNR in each receiver antenna to minimize the Bit Error Rate (BER) and maximize the throughput. Studying the performance of a priori different alternatives, both analytically and empirically, several equivalents are found. Finally, the simulation results show that the proposed scheme achieves …
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Design of optimal equalizers and precoders for MIMO channels
… (ZF) condition, but also minimizes the RMS error between the transmitted symbols and the received symbols. The second part of this dissertation investigates the design of optimal precoders which minimize the bit error rate (BER) subject to a fixed transmit-power constraint for the multiple …
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OFDM Channel Estimation with Artificial Neural Networks
… the approach based on CNN can reduce the bit error rate (BER) of data transmission by an average of 47.59%.</p>
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BER-optimal analog-to-digital converters for communication links
In this thesis, we propose BER-optimal analog-to-digital converters (ADC) where quantization levels and thresholds are set non-uniformly to minimize the bit-error rate (BER). This is in contrast to present-day ADCs which act as transparent waveform preservers. We define the ADC shaping gain metric …
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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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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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Man-made impulsive noise on the 137 MHz VHF LEOSAT channel
… has produced a demand for low-Earth orbit satellite (LEOSAT) implementation. A proposed LEOSAT link at VHF would provide paging and radio-location services to subscribers in automobiles. Link performance has traditionally been determined by thermal background noise produced internally …
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Adaptive, Turbo-coded OFDM
… quickly transmit information wirelessly and accurately. Engineers have already combine techniques such as orthogonal frequency division multiplexing (OFDM) suitable for high data rate transmission with forward error correction (FEC) methods over wireless channels. In this thesis, we enhance the …
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