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 14 of 14 for “"Turbo coding"”.
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Source-controlled block turbo coding
This thesis proposes the use of block turbo codes for transmitting nonuniform binary memoryless sources over AWGN channels. As opposed to standard convolutional turbo codes, block turbo codes are known to achieve good performance for high code rates, up to 98% of the channel capacity for uniform …
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Turbo coding in correlated fading channels
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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Turbo coding and equalization for wireless communication systems
Turbo coding, a forward error correcting coding (FEC) technique, has made near Shannon Limit performance possible when Iterative decoding algorithms are used. Intersymbol interference (ISI) is a major problem in communication systems when information is transmitted through a wireless channel. …
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On a turbo decoder design for low power dissipation
A new coding scheme called "turbo coding" has generated tremendous interest in channel coding of digital communication systems due to its high error correcting capability. Two key innovations in turbo coding are parallel concatenated encoding and iterative decoding. A soft-in soft-out component …
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Trellis-based iterative decoding of block codes for satellite ATM
… at very low Signal-to-Noise Ratios (SNRs). Turbo Codes or concatenated codes with iterative decoding, can achieve a performance very close to the Shannon limit. They are the most powerful codes known so far and are considered for use in various applications. In this thesis, we present the …
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Adaptive, Turbo-coded OFDM
… throughput of a working OFDM system by adding turbo coding and adaptive modulation (AD). Simulation is done over a time varying, frequency selective Rayleigh fading channel. The temporal variations in the simulated wireless channel are due to the presence of Doppler, a sign of relative motion …
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Near-capacity MIMOs using iterative detection
… Additionally, in order to maximise the coding advantage of DSTS, it is combined with Sphere Packing (SP) modulation. The related capacity analysis shows that the DSTS-SP scheme exhibits a higher capacity than its counterpart dispensing with SP. Furthermore, in order to attain additional …
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Coherent versus non-coherent space-time shift keying for co-located and distributed MIMO systems
In this thesis, we propose the novel Space-Time Coding (STC) concept of Space-Time Shift Keying (STSK) and explore its characteristics in the contexts of both co-located and cooperative Multiple-Input Multiple-Output (MIMO) systems using both coherent and non-coherent detection. Furthermore, we …
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Turbo space-time coding for mimo systems : designs and analyses
… systems. Specifically, this dissertation studies turbo space-time coding schemes for MIMO systems. Before the designs of turbo space-time codes are presented, a fundamental tool to analyze and design turbo coding schemes, the extrinsic information transfer (EXIT) chart method, is extended from the …
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Design and analysis of transmission strategies in wireless relay networks
… MIF schemes in TWRC. Finally, distributed turbo coded (DTC) relay channel is considered. Unlike the traditional DTC schemes, where the source encodes the information by a single recursive systematic convolutional (RSC) encoder, we adopt a turbo code to encode the source information. The …
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Turbo space-time coded modulation : principle and performance analysis
A breakthrough in coding was achieved with the invention of turbo codes. Turbo codes approach Shannon capacity by displaying the properties of long random codes, yet allowing efficient decoding. Coding alone, however, cannot fully address the problem of multipath fading channel. Recent advances in …
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IoT Networking via Cross-technology Communication
… it addresses other practical constraints (e.g., turbo coding constraint) to achieve transparent CTC with full compatibility with LTE standards. Our experiment result shows that LTE smartphones can directly disseminate messages to ZigBee devices within a 400-meter range. Second, we introduce XFi …
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Resource allocation for CDMA downlink to achieve maximum throughput
… can be altered by varying one or more of the coding, interleaving, modulation and spreading block parameters. In the downlink of DS-CDMA systems, once the parameters of the above mentioned blocks are set, the base station will transmit at the lowest power level that can provide the QoS …
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Simulace přenosu DVB-H a DVB-SH
Práce se zabývá kanálovým kódováním a modulací v systémech DVB-H a DVB-SH a simulací těchto částí v prostředí MATLAB. U systému DVB-H se zabývá také vlivem různých typů přenosových kanálů na přenos. V první části práce je popsáno kanálové kódování a vnitřní modulace v systémech DVB-H a DVB-SH. V …