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 8 of 8 for “"Convolutional coding"”.
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Multiuser detection for CDMA systems with convolutional coding
… the capacity of COMA systems. Error correction coding is also an important technique for overcoming severe channel degradation. In this project, we investigate the performance of multiuser receivers which use the combination of interference cancellation techniques and error correction codes. …
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Trellis-coded permutation modulation for improved performance of narrowband noncoherent FSK
… (TCM) , which is a combined technology of convolutional coding and modulation, to FSK permutation. TCM was originally designed for coherent modulation. The application of TCM to permutation modulation retains the fundamental concepts of TCM. The simulation results show that trellis-coded …
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Artificial neural network decoding of multi-h CPM
… into the artificial neural network (ANN) decoding of multi-h continuous phase modulation (CPM) schemes. Multi-h CPM schemes offer forward error correction (FEC) capabilities for continuous transmission, digital communication systems. Multi-h CPM is reported to be a bandwidth efficient …
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DSP implementation of trellis coded modulation and distributed space time coding
Trellis coded modulation (TCM) combines convolutional coding with modulation, and offers approximately 2--3 dB of coding gain without requiring a corresponding bandwidth expansion. This thesis describes the process of encoding TCM, convolutional codes, decoding using the Viterbi Algorithm (VA), …
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Implementation of Parallel and Serial Concatenated Convolutional Codes
Parallel concatenated convolutional codes (PCCCs), called "turbo codes" by their discoverers, have been shown to perform close to the Shannon bound at bit error rates (BERs) between 1e-4 and 1e-6. Serial concatenated convolutional codes (SCCCs), which perform better than PCCCs at BERs lower than …
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Selective Interference Cancellation and Frame Synchronization for Packet Radio
… interference suppression with error correction coding is studied. A decoder-assisted frame synchronization technique is proposed for future packet radio system. The performance of DS-CDMA in packet radio networks suffers from the near-far problem. This near-far problem can be alleviated by using …
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Performance of GMSK and 7/4-DQPSK Modulations in Land Mobile Radio Channels
… bound on the bit error rate is also derived for convolutional coded 7r/ 4-DQPSK modulation with frequency-offset diversity and soft decision Viterbi decoding. Based on the numerically computed bit error rate bound it was found that the combination of frequency- offset diversity and convolutional …
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Computational Intelligence and Complexity Measures for Chaotic Information Processing
… analysis is performed on a class of certain rate convolutional encoders. The degree of diffusion in random-like patterns is measured. Simulation evidence indicates that algorithmic complexity associated with a particular class of 1/n-rate code increases with the increase of the encoder constraint …