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 “"convolutional codes"”.
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Error mechanisms for convolutional codes.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1968. Ph.D.
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Asymptotically good convolutional codes with feedback encoders
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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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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Some Optimal and Near-Optimal Low Rate Algebraic Convolutional Codes
Made available in DSpace on 2014-12-14T13:09:41Z (GMT). No. of bitstreams: 1 8004161.pdf: 2733449 bytes, checksum: 8d8ffe6487a5994678a19af55d7627f5 (MD5) Previous issue date: 1979
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Hybrid ARQ with parallel and serial concatenated convolutional codes for next generation wireless communications
… the thesis provides an in-depth explanation of convolutional encoding and Viterbi decoding, turbo (PCCC) and serial concatenated convolutional (SCCC) encoding with their respective MAP decoding strategies.;A type-II hybrid ARQ scheme with SCCCs is proposed for the first time and is a major …
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A comparison of two novel channel coding techniques for CDMA
… techniques are available, including "trellis codes" specifically designed for CDMA, very low rate convolutional codes and conventional convolutional codes. An analytic approach is developed to compare the performance of different coding techniques for CDMA on the same basis by extending …
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Concatenation of Space-Time Block Codes with ConvolutionalCodes
… into communication systems. Space-time block codes present a way of introducing transmit diversity into the communication system with similar complexity and performance as maximal ratio receive combining. In this thesis we study the performance of space-time block codes in Rayleigh fading …
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Coding performance on the AX.25 radio packet
… thesis studies the performance of various BCH codes, the (23,12) Golay code, Reed-Solomon codes, and different rate convolutional codes with varying constraint lengths when used in conjunction with the go-back-N ARQ. Code combining and concatenation are also studied. The performance of these …
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Wireless speech and audio communications
… a turbo-detected UEP scheme using twin-class convolutional codes and another turbo detector using more sophisticated Irregular Convolutional Codes (IRCC). In our investigations, the MPEG-4 Advanced Audio Coding (AAC), the MPEG-4 Transform-Domain Weighted Interleaved Vector Quantization …
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A hardware implementation of a Viterbi decoder for a (3,2/3) TCM code
… Modulation refers to a specific sub-class of convolutional codes that ire an example of coded modulation. In coded modulation there is a direct link between the encoding and modulation processes aimed at improving the performance of the code by introducing redundancy in the signal set used to …
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Design and testing of a real time simulation for Trellis Coded Modulation
… a comparison between Ungerboeck and pragmatic codes and varying and observing different Viterbi decoder parameters for coded 8PSK. TCM is coded modulation which means the choice of modulation scheme is linked with the encoding technique. Convolutional codes are important for an understanding of …
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Quantized Guessing Random Additive Noise Decoding - A Universal Quantized Soft-Decoder
… error correction potential of different channel codes, particularly Polar Adjusted Convolutional codes, CA-Polar codes, and CRCs.
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Coding performance on satellite channels using AX.25 protocol
… (ARQ) schemes and error correcting codes have been employed. Currently a combination of both is not employed by the AX.25 protocol. The purpose of this project is to determine which error correcting code should be combined with ARQ to provide the optimum performance. This project …
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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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On a Viterbi decoder design for low power dissipation
… Viterbi decoders are used to decode convolutional codes. Viterbi decoders employed in digital wireless communications are complex and dissipate large power. With the proliferation of battery powered devices such as cellular phones and laptop computers, power dissipation, along with …
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Low-bit-rate joint source-channel decoding aided wireless video communications
… by applying different-rate Recursive Systematic Convolutional (RSC) codes.<br/><br/>We then further improved the attainable performance of a Data-Partitioned (DP) H.264 coded video transmission system using UEP based IrRegular Convolutional Codes (IRCC). An iterative detection aided combination …
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High Speed Turbo Tcm Ofdm For Uwb And Powerline System
… Shannon limit error correcting ability of turbo codes with the high spectral efficiency property of TCM codes. We build a punctured parity-concatenated trellis codes in which a TCM code is used as the inner code and a simple parity-check code is used as the outer code. It can be constructed by …
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Channel-coded time-hopping and direct-sequence ultrawideband systems
… for this problem by replacing the regular FEC codes with more sophisticated irregular FEC codes that are capable of approaching the system’s capacity more closely. More specifically, we have used Irregular Variable Length Codes (IrVLC) in our design of a two-stage concatenated UWB TH …
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