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 31 for “"AWGN channel"”.
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Design Of Fountain Codes With Error Control
… using distributed lt codes over a binary erasure channel (bec), and designing fountain codes with error control property by integrating lt codes with turbo codes over a binary input additive white gaussian noise (bi-awgn) channel. A simple yet efficient technique for decomposing the rsd into two …
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Coding Techniques for Linear Block Codes With Applications to Fault Identification
When channel reliability information is available, soft-decision decoding becomes attractive for many applications, since maximum-likelihood (ML) soft-decision decoding offers (roughly) 3 dB additional gain over algebraic decoding. Since ML soft-decision decoding is an NP-hard problem, we …
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Coding Strategies for Combating Interference on Point-to-Point and Multiple Access Channels
… over point-to-point and multiple access channels with interference, where the interference is unknown to the transmitter or the receiver but is known to a third party whom we call the ""helper."" The task of the helper is to use his knowledge to significantly improve the quality of the …
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Ultra-wideband technology for short-range wireless communication
… scheme over additive white Gaussian noise (AWGN) and multipath channels. Starting from the known capacity of M-ary modulated signals, the computation of UWB capacity over the AWGN channel takes into account UWB specific constraints. The constraints are the power spectrum density limitation …
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Spatially Coupled Sparse Regression Codes for Single- and Multi-user Communications
Sparse regression codes (SPARCs) are a class of channel codes for efficient communication over the single-user additive white Gaussian noise (AWGN) channel at rates approaching the channel capacity. In a standard SPARC, codewords are sparse linear combinations of columns of an i.i.d. Gaussian …
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Improved successive interference cancellation schemes using selective pre-cancellation and cross- correlation
… achieves capacity improvements up to 100% in an AWGN channel and 26% in a Rayleigh fading channel compared to a SIC without the improvements. This is achieved with minimal additional computation complexity and processing time.
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Multicarrier Wireless Systems with Adaptive Decision Combining
… and assume an additive, white gaussian noise(AWGN) channel. Computer simulations of bit error rate performance for a variety of multicarrier OFDM systems with decision combining are presented and compared with the performance of systems without decision combining.
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Broadband Fading Channels: Signal Burstiness and Capacity
… and uncorrelated scattering (WSSUS) fading channel has a similar behavior in that the capacity per unit energy equals the capacity per unit energy of the AWGN channel with the same signal-to-noise ratio. The fourth-moment cost is generalized to a fourth-order functional called fourthegy …
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Coding for random access in wireless networks
… Previous works in this regard focused on the AWGN channel model. In this thesis we consider the issue of Rayleigh fading. Specifically, we use random coding with a subspace projection based decoder to get finite blocklength bounds from which we arrive at the trade-off. Further we justify the …
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Communications in the observation limited regime
… systems when the principal cost is observing the channel, as opposed to transmit energy per bit or spectral efficiency. This is motivated by energy constrained communications devices where sampling the signal, rather than transmitting or processing it, dominates energy consumption. We show that …
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Simulation of Adaptive Array Algorithms for CDMA Systems
… algorithms in all the test situations (e.g., AWGN channel, timing offset case, frequency offset case, and multipath environment). It is also shown that these two algorithms have less complexity and can converge faster than the other algorithms.
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Nonlinear Adaptive Estimation Andits Application To Synchronization Of Lorenz System
… When an additive white gaussian noise (AWGN) channel model is considered, estimates of state and parameter converge except for small errors. The results show promise in either coherent detection or the message decoding in telecommunication systems.
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Analysis of Wavelet Based Alternatives for OFDM
… systems in an additive white Gaussian noise (AWGN) channel. The analysis is verified by Monte Carlo simulation. The results in the thesis indicate that the bit error probability (BEP) performance is the same for all types of systems. This confirms some results presented in the literature but …
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Performance Evaluation of DECT in Different Radio Environments
… the performance of DECT in different channel conditions. DECT is simulated using the Signal Processing WorkSystem (SPW) software in different channels including the additive white Gaussian noise (AWGN) channel, the flat faded Rayleigh channel, the frequency selective faded Rayleigh …
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A Novel Chirp Slope Keying Modulation Scheme for Underwater Communication
… first tested using the fundamental communication channel, Additive White Gaussian Noise (AWGN) channel. Simulation results show excellent BER vs. SNR performance, implying CSK is a promising method. Further extensive analysis and simulations are performed to evaluate the quality of CSK in more …
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The Effect of Receiver Nonlinearity and Nonlinearity Induced Interference on the Performance of Amplitude Modulated Signals
… a high powered interfering signal at an adjacent channel. As the RF spectrum becomes more crowded, the interference caused by these adjacent signals will become a more significant problem for receiver design. Therefore, having bit and symbol error rate expressions that take the receiver …
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A novel OFDM Blind Equalizer: Analysis and Implementation
… is implemented at the receiver to estimate the channel impulse response. This estimate can be fed back to the transmitter via a feedback channel, which can in turn help generate a sub-optimal transmission solution for the current situation. In this thesis, a link adaptation method is proposed …
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Blind Channel Estimation and Multiuser Detection for Multi-Rate CDMA Communications
… wireless links. Currently, the study on channel estimation and multiuser detection for multi-rate DS/CDMA, which makes full use of the nature of multi-rate signals, is still at its early stage. The thesis deals with the application of subspace-based techniques to blind channel estimation …
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Implementation and evaluation of various stop and wait type II hybrid ARQ schemes for mobile radio
… is presented and numerically analyzed in both an AWGN channel and a combined AWGN and Rayleigh fading channel. The three variations of the general scheme implemented are: Rate 3/4 CPC SW Type II ARQ, Rate 3/4CPC SW Type II ARQ with Code Combining, and an Adaptive CPC SW Type II ARQ scheme. The …
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A framework for low-complexity iterative interference cancellation in communication systems
Communication over interference channels poses challenges not present for the more traditional additive white Gaussian noise (AWGN) channels. In order to approach the information limits of an interference channel, interference mitigation techniques need to be integrated with channel coding and …
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