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 28 for “"symbol error rate"”.
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
… amplifier (LNA) and mixer. When receivers operate in the non-linear region, this will affect the system performance due to intermodulation products, and cross-modulation, to name a few. Intermodulation products are the result of adjacent channel signals that combine and create intermodulation …
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Error-rates of digital signaling with coherent and noncoherent detections
… noncoherent detection schemes are considered. A symbol error-rate or probability of error is used as the performance criterion for comparison purpose.
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A Neural Network Receiver for EM-MWD Communication
… limits the depth at which EM-MWD systems can operate. Correlation receivers, which are optimal in the presence of additive white Gaussian noise, can be sub-optimal in the presence of various types of field noise at different drilling sites. </p> <p>This thesis investigates the application of …
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Shape Up: Peak -Power Reduction via Constellation Shaping
For high rate systems, the hyperspherical and hyperdiamond shaping reduce the unclipped peak power by 5 to 7 dB with no loss of data rate and with a symbol error rate that is virtually identical to that of conventional systems. With a clipping rate of 10-8, they still provide up to 2.8 dB of …
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Node Selection, Synchronization and Power Allocation in Cooperative Wireless Networks
… demand for reliable, robust and high data rate communication systems that can counteract the limitations imposed by the scarcity of two fundamental resources for communications: bandwidth and power. In turn, cooperative communications has emerged as a new communication paradigm in which …
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Performance evaluation of chirp spread spectrum system and Land Mobile Satellite System by computer simulation
… by computer simulation. Two simulations were separately performed for a spread spectrum chirp system as an analog communications system, and for the Land Mobile Satellite System (LMSS) channel as a digital communications system. For the simulation of analog communications, a spread spectrum system …
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An Opportunistic Routing Protocol Design for Wireless Networks: A Physical Layer Perspective
… outage probability and the end-to-end average symbol error rate are studied in the analysis of these types of networks with the proposed network diversity schemes. Numerical results reveal that the proposed schemes can offer significant power efficiency improvement in a variety of operating …
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System design and performance analysis of asymmetrically and symmetrically clipped optical (ASCO)-OFDM for IM/DD optical wireless communications
… and has been widely used to combat inter-symbol-interference (ISI) resulting from multipath propagation in RFCs. So far, the technique of OFDM has also been successfully applied into IM/DD optical wireless systems. In this dissertation, the author focuses on the system design and …
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Use of Reinforcement Learning for Interference Avoidance or Efficient Jamming in Wireless Communications
… and frequency-domain jamming schemes. We demonstrate that the linear TS algorithm is able to perform better than a traditional reinforcement learning algorithm, upper confidence bound-1 (UCB-1), in terms of maximizing the victim's symbol error rate. We also draw novel insights by observing the …
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COOPERATIVE COMMUNICATIONS FOR LTE-ADVANCED SYSTEMS: DOWNLINK RELAY AND PERFORMANCE OPTIMIZATION
… (E-DF), which improves diversity and data rate and reduces the symbol error rate. The dissertation also proposes and analyzes the performance of several half-duplex downlink relay schemes in interference-limited cellular systems. These schemes are – The Omni-Relay (OR) scheme, The …
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The Effect of Receiver Nonlinearity and Nonlinearity Induced Interference on the Performance of Amplitude Modulated Signals
… for receiver design. Therefore, having bit and symbol error rate expressions that take the receiver nonlinearity into account will allow for determining the linearity requirements of a receiver. This thesis examines the modeling of the probability density functions of M-PAM and M-QAM signals …
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Practical Considerations for Radar Embedded Communication
… receiver due to multipath distortion, sampling rate differences and using different lengths for the radar waveform are explored for each of the three previously developed design methods. The Dominant-Projection approach is shown to be robust to most mismatches while the other two approaches …
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Relay Diversity Techniques for OFDM and MC-CDMA
… a collection of communication nodes to cooperate<br/>with to relay signals amongst each other, eectively creating a virtual<br/>antenna array, which combat multipath fading in wireless channels.<br/>This thesis investigates relay diversity techniques in cooperative communications,<br/>namely …
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A new sufficient-order blind equalization scheme
… based on the well known least mean square error criterion using a gradient method, and for the adaptation of the FIR filter, a constant modulus adaptive algorithm is proposed. It is shown that the proposed blind equalization scheme requires a substantially less amount of computations and is …
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Performance evaluation of detection algorithms for MOMI OFDM systems
… MIMO which is used to improve the data rate and network capacity. In NGN different multi access modulation schemes will be used for uplink and downlink but they both have OFDM as the basic building block. In this work performance of MIMO OFDM is investigated in different channels models …
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New d-piso architecture for dynamic symbol size digital baseband modulation implementation in FPGA
Dynamic symbol size modulation is a type modulation which could provide a fast transmission speed by removing the redundant symbol as compare to fixed symbol size modulation. The dynamic nature of the symbol created an additional problem in hardware design as the size of symbol needed to be defined …
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Intercarrier Interference Suppression for the OFDM Systems in Time-Varying Multipath Fading Channels
… the wireless OFDM systems are expected to operate at high carrier-frequencies, high speed and high throughput mobile reception, where the fasting time-varying fading channels are encountered. The channel variation destroys the orthogonality among the subcarriers and leads to the intercarrier …
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Distortion-Tolerant Communications with Correlated Information
… WSNs distortion is quantized as the mean square error between the original and the reconstructed signals. Then we extend the analysis into WSNs with spatial-temporally correlated data. The optimum sampling in the space and time domains</p> <p>is derived. The analytical optimum results can provide …
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A class of batch-iterative methods for the equalization of intersymbol interference channels
… nonlinear receivers is proposed to equalize intersymbol interference (ISi) channels in a batch-iterative fashion. The iterated-decision or multipass equalizer uses symbol decisions made during the previous iteration to cancel out both precursor and postcursor ISi during the current iteration. With …
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