Global ETD Search
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Showing 1 to 11 of 11 for “"QAM modulation"”.
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Analysis, improvement and extensions of a Lee metric list decoding algorithm for alternant codes
… codes over a Gaussian channel with a PSK or QAM modulation and to compare Lee and Hammming metrics.
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Adaptive multilevel quadrature amplitude radio implementation in programmable logic
… are increasingly employing spectrally efficient modulation methods like Quadrature Amplitude Modulation (QAM) to increase the channel efficiency and maximize data throughput. Unfortunately, the performance of high level QAM modulations in the wireless channel is sensitive to channel imperfections …
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Hardware/Software Co-Design Architecture and Implementations of MIMO Decoders on FPGA
… The decoders for a 4 by 4 MIMO system with 16-QAM modulation scheme are prototyped on a Xilinx XC2VP30 FPGA device. The hardware implementations of the AV and VB decoders show that they support up to 81 Mbps and 37 Mbps data rate respectively. The performances in terms of resource utilizations …
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Experimental demonstration of cap transmitter using very high speed IC hardware description language (VHDL)
Carrierless Amplitude Phase (CAP) Modulation is a multidimensional and multilevel of modulation scheme which it is strongly inspired by QAM modulation scheme. CAP does not depend on a carrier and it is much simpler. Lots of CAP modulation experiments have been proposed and demonstrate but none of …
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Advanced Orthogonal Frequency-Division Multiplexing Systems with Cyclic Prefix-Less Multiple-Input and Multiple-Output Discrete Fourier Transform Spreading and Unmanned Aerial Vehicles-Assisted Cyclic Postfixed Windowed Schemes
… Eb/N₀ = 15 dB with 16-Quadrature Amplitude Modulation (16-QAM) modulation. To improve the spectral efficiency and robustness of wireless communication systems, on the other hand, drone-assisted 5G and beyond 5G wireless communication networking capabilities require strong consideration of …
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Design and verification of SC-FDE/OFDM communication schemes for millimetre-wave wireless system using FPGA technologies
… GHz, with up to 100 Mb/s data-rate utilizing 16-QAM modulation scheme is realized.<br/><br/>The re-programmability offered by field-programmable gate arrays (FPGAs) along with their capability of performing real-time digital signal processing has been exploited. A FPGA-based platform is employed …
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Simulation, performance and interference analysis of multi-user visible light communication systems
… “white” LEDs, and under PSK and QAM modulation. Two scenarios are used in the validation of the VLC module: (i) using a receiver placed right bellow the transmitter with varying range, and (ii) using a receiver with a fixed range and varying angle of acceptance. Results indicate …
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On the Impact of Channel and Channel Quality Estimation on Adaptive Modulation
… wireless systems are designed by choosing a modulation scheme to meet worst case conditions and thus rely on power control to adapt to changing channel conditions. Adaptive modulation, however, exploits these channel variations to improve the spectral efficiency of wireless communications by …
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Code design and analysis for multiple access communications
… over Gaussian integers, suitable for use with QAM modulation, are considered. Two sub-classes of m-sequences with quasi-perfect periodic autocorrelations are obtained. The CCFs between the decimated m-sequences are studied. By applying a simple operation, it is shown that some m-sequences over …
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The Effect of Receiver Nonlinearity and Nonlinearity Induced Interference on the Performance of Amplitude Modulated Signals
… the probability density functions of M-PAM and M-QAM signals through an AWGN channel taking into account the impact of receiver nonlinearity. A change of variables technique is used to provide a relationship between the pdf of these signals with a linear receiver and the pdf with a nonlinear …
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ΜΕΛΕΤΗ ΚΑΙ ΥΠΟΛΟΓΙΣΜΟΣ ΤΗΣ ΕΠΙΘΥΜΗΤΗΣ ΠΡΟΠΑΡΑΜΟΡΦΩΣΗΣ ΓΙΑ ΤΗΝ ΔΙΟΡΘΩΣΗ ΤΗΣ ΕΙΣΑΓΟΜΕΝΗΣ ΠΑΡΑΜΟΡΦΩΣΗΣ ΣΕ ΜΗ ΓΡΑΜΜΙΚΟΥΣ ΠΟΛΥΕΠΙΠΕΔΟΥΣ ΨΗΦΙ...
… USING M-ARY DIGITAL SCHEMES SUCH AS M-ARY QAM [1.4]. IN FACT M- ARYQAM SCHEMES PRESENT MUCH BETTER POWER/BANDWIDT EFFICIENCY THAN THE EQUIVALENT M-ARY PSK IN AWGN ENVIRONMENT. MOREOVER, COCHANNEL IMMUNITY OF M-ARY QAM IS SUPERIOR TO THAT OF M-ARY PSK BUT IN THE CONTRAST THEY ARE ESPECIALLY …