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 9 of 9 for “"coding rate"”.
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Coding in 802.11 WLANs
Forward error correction (FEC) coding is widely used in communication systems to correct transmis- sion errors. In IEEE 802.11a/g transmitters, convolutional codes are used for FEC at the physical (PHY) layer. As is typical in wireless systems, only a limited choice of pre-speci¯ed coding rates is …
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Cross-Layer Game Theoretic Mechanism for Tactical Mobile Networks
… in this case are modulation scheme and channel coding rate. It is shown that both the TC game and the LAG converge to a Nash Equilibrium (NE). It is also shown that the solution for the TC game approximates the topology that results from maximizing the utility function when appropriate link …
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Generalizations of permutation source codes
… quantizers with a computationally- simple encoding procedure. In this thesis, we provide two extensions that preserve the computational simplicity but yield improved operational rate-distortion performance. In the first approach, the new class of vector quantizers has a codebook comprising …
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Joint source channel coding for progressive image transmission
… to channel noise and protections from channel coding are necessary. Typical error correcting capability of channel codes varies according to different channel conditions. Thus, separate design leads to performance degradation relative to what could be achieved through joint design. In joint …
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Communication and time distortion
… signals. They are advertised with data rates of a few kbps, but the oil and gas industry has found them useful only to around 100 bps. In our work, time-varying Doppler is explicitly modeled, tracked and compensated. Integrated into an iterative turbo equalization based receiver, this …
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Range Adaptive Protocols for Wireless Multi-Hop Networks
… change processing gain, forward error correction coding rate, transmit power, and number of simultaneous connections. In addition, the ad hoc routing protocol is extended with the clustering algorithm for mobile ad hoc network (CAMEN). With ADIM-NB in mind, CAMEN discourages the use of broadcast …
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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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Exploring anomaly detection methods using features extracted with a neural network
… (MSP) as an anomaly score. We also demonstrate that the features extracted using neural networks often lead to better anomaly detection performance than the features obtained by simply reducing the dimensions of the input images (e.g. using principal component analysis).
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Energy-efficient adaptive data rate optimisation scheme for LoRaWAN
… frequency band, scalability, low bit rate, and energy efficiency. LoRaWAN networks consist of low-power end devices connected in a star-of-star topology to a network server (NS) through a gateway (GW), enabling seamless exchange of data connected through an IP-based back-haul …