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 10 of 10 for “"Hybrid ARQ"”.
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Performance analysis of collaborative hybrid-arq protocols over fading channels
… Among cooperative schemes, Collaborative ARQ transmission protocols, prescribing cooperation only when needed, i.e., upon erroneous decoding by the destination, emerge as an interesting solution in terms of achievable spectral efficiency. In this thesis, an information theoretical approach …
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Hybrid ARQ with parallel and serial concatenated convolutional codes for next generation wireless communications
… systems by incorporating these schemes in a hybrid FEC-ARQ environment. Beginning with an overview of wireless communications and the various ARQ protocols, the thesis provides an in-depth explanation of convolutional encoding and Viterbi decoding, turbo (PCCC) and serial concatenated …
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Implementation and evaluation of various stop and wait type II hybrid ARQ schemes for mobile radio
… of various Stop-and-Wait (SW) Type II Hybrid Automatic Repeat reQuest(ARQ) strategies. The modulation scheme utilized is the North American digital cellular standard known as 7r/4—shift DQPSK. The general Complementary Punctured Convolutional (CPC) SW Type II ARQ scheme is presented and …
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ARQ Techniques for MIMO Communication Systems
… Traditional automatic-repeat-request (ARQ) techniques developed for single-input single-output (SISO) communication systems have to be modified in order to be employed in MIMO communication systems. In this dissertation, we propose and analysis some ARQ techniques for MIMO communication …
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Integrating spinal codes into wireless systems
… rate adaptation and generalizing the approach of hybrid ARQ/incremental redundancy systems such as LTE [29]. On the silicon side, this thesis presents the development of a VLSI architecture that exploits the inherent parallelism of the spinal decoder.
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Optimum Design of Spectral Efficient Green Wireless Communications
… the optimum designs of automatic repeat request (ARQ) and hybrid ARQ (HARQ) systems are performed to by using the EE and SE as design metrics. Specifically, a new metric of normalized EE, which is defined as the EE normalized by the SE, is proposed to achieve a balanced tradeoff between the EE and …
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Energy-aware network coding circuit and system design
… in partial packets, similarly to existing Hybrid-ARQ schemes, but with a PHY-agnostic approach. Minimization of the number of retransmitted packets saves transmission energy and results in higher total network throughput, making PPRNC an attractive candidate for energy constrained networks, …
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Practical packet combining for use with cooperative and non-cooperative ARQ schemes in wireless sensor networks
… These include cooperative communications and hybrid-ARQ schemes which have been shown to be of major benefit for wireless communications. Using the packet combining scheme developed in this thesis more than an 85% reduction in energy costs are possible over previous, similar approaches. Both …
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Dynamic Cooperative Communications in Wireless Ad-Hoc Networks
… for both a simple automatic repeat request (ARQ) and a hybrid ARQ technique. The benefits of the cooperative ARQ approach are also verified in a multihop network with random configurations when there are concurrent packet transmissions. The average transmit power for the cooperating signals …
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Packet data communications over coded CDMA with hybrid type-II ARQ
… It is divided into three parts; (1) CDMA with hybrid FEC/ARQ in deterministic environment, (2) CDMA with hybrid FEC/ARQ in random access environment and (3) an implementation issue on turbo decoding. As a preliminary, the performance of CDMA with hybrid FEC/ARQ is investigated in deterministic …