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 62 for “"Phase Shift Keying"”.
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Trellis Coded Modulation Schemes Using A New Expanded 16-Dimensional Constant Envelope Quadrature-Quadrature Phase Shift Keying Constellation
… Constant Envelope Quadrature-Quadrature Phase Shift Keying constellations. Optimal demodulators for the two constellations are presented, and one of them was designed and implemented by the author. In addition, a novel expanded 16-dimensional CEQ2PSK constellation that doubles the number …
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Analysis of digital communication signals and extraction of parameters
… communication signals considered include Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), Frequency Shift Keying (FSK), and On-Off Keying (00K). The analysis emphasizes the use of available signal processing software. Detection methods compared include broadband energy …
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PAPR reduction in OFDM communications with generalized discrete Fourier transform
… PAPR efficiency of SCFDMA systems for Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK) and 16 Quadrature Amplitude Modulation (16-QAM), digital modulation techniques are increased.
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Physical Layer Design for a Spread Spectrum Wireless LAN
… technology and a differential binary phase shift keying/quadrature phase shift keying (BPSK/QPSK) non-coherent receiver to overcome the adverse indoor wireless environment. Moreover, a variable data rate transmission technique is used to dynamically configure the spread spectrum system …
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Ambient ZeroScatter: Ambient BPSK and QPSK Backscatter Communication using Existing Digital I/O Pins
… on MCUs and FPGAs can be re-purposed as binary phase-shift keying (BPSK) backscatter modulators in the UHF and microwave bands with zero added components, and that multiple digital I/O pins can be used in combination with series or shunt impedances to produce quadrature phase-shift keying (QPSK) …
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Error-rates of digital signaling with coherent and noncoherent detections
… data communication systems, namely, amplitude-shift keying (ASK), frequency-shift keying (FSK), and phase-shift keying (PSK), for both binary coded and M-ary coded transmissions are presented in this paper. The analysis is limited to only nonfading received signal in additive Gaussian noise. …
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Spectrum Sensing and Blind Automatic Modulation Classification in Real-Time
… ratio (SNR) for some cases of the phase shift keying family of modulations but requires a much higher SNR to accurately classify higher-order modulations. These estimates tend toward classifying all signals as binary phase shift keying because of limits of the noise power estimation …
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Wavelet Modulation in Gaussian and Rayleigh Fading Channels
… channel is comparable to theoretical binary phase shift keying. Our results depict the improvement in performance that can be realized for time varying channels by utilizing the various rates of wavelet modulation; BER versus SNR curves for each fading channel show how the message at one rate …
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Orthogonal Frequency Division Multiplexing Modelling
… examined using 16QAM, 32QAM and 64QAM, Binary phase shift keying (BPSK), eight phase shift keying (8PSK), quadrature phase shift keying (QPSK), 16QAM, 32QAM and 64QAM OFDM modulation techniques were used. Channel noise is modelled by adding a white Gaussian noise (AWGN). The channel noise …
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New method of polar channel coding for reducing the bit error rate with low complexity in the F-OFDM underwater acoustic communications
… of freedom. Also, the derivation of Binary Phase Shift Keying (BPSK) and Quadrature Phase Shift Keying (QPSK) for the UWA was proposed and validated with the channel simulation. In addition, this thesis proposes a new method in UWA for reducing the BER value with low computational …
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Modeling and Analysis of Synchronization Schemes for the TDMA Based Satellite Communication System
… the presence of CFO, the performance of binary phase shift keying/quadrature phase shift keying (BPSK/QPSK)-OFDM impaired by CFO is evaluated and simulated under AWGN, Rayleigh flat fading, and frequency selective fading. Because of the lack of analyses in higher order modulation or modulation …
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A Hardware Implementation of a Coherent SOQPSK-TG Demodulator for FEC Applications
… demodulator for shaped offset quadrature phase shift keying, telemetry group version (SOQPSK-TG) for use in forward error correction (FEC) applications. Implementation details for data sequence detection, symbol timing synchronization, carrier phase synchronization, and block recovery are …
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Numerical modelling of advanced modulation formats and WDM transmission
… the combination of return-to-zero differential phase-shift keying (RZ-DPSK) with advanced photonic devices. Finally we analyse the dispersion management of Nx40 Gbit/s RZ-DPSK transmission applied to a commercial terrestrial lightwave system.
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Energy-Efficient Multicarrier and Multicarrier-CDMA Systems
… (CCDFs) of PAPR of OFDM signals for Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), and -QPSK are obtained as a function of number of subcarriers in the system. It is shown that PAPR reductions up to can be achieved using the proposed methods for a 128-subcarrier OFDM …
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Μελέτη αλγορίθμων ψηφιακής επεξεργασίας σήματος για ομόδυνο δέκτη QPSK σε οπτικά συστήματα μεγάλων αποστάσεων υψηλής φασματικής απόδοσης
… industry, special focus is placed on quadrature phase-shift keying (QPSK), and specifically on polarization division multiplexed (PDM) QPSK. A special kind of receiver is investigated thoroughly, the digital coherent receiver, the equivalent of the coherent quadrature demodulator in classical …
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Investigation into variable shift keying using direct sequence spread spectrum techniques
… unknown modulation scheme called VPSK (Variable Phase Shift Keying) and the use of DSSS (Direct Sequence Spread Spectrum) techniques to achieve carrier synchronization and hence coherent demodulation in the receiver. VPSK is a new and relatively unknown modulation scheme in which data bits are …
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Performance evaluation of nonlinear satellite link by computer simulation
… satellite channel using QPSK (Quaternary Phase Shift Keying) and MSK (Minimum Shift Keying) has been studied by computer simulation. In the simulation, the pseudo randomly generated input data stream modulates the carrier and this modulated carrier passes through the typical satellite …
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Towards Advanced Photonic Integrated Systems Through Electronic-Assisted Design
… the low-latency, low-parasitic, and on-chip phase coherence of the PIC to address a few of the existing challenges through system-level electronic-photonic co-design. First, 40 Gb/s optical receiver for intensity modulation direct detection (IM/DD) optical links with a cost-effective …
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Effect of Doppler shift on adaptive OFDM modulation for cognitive radio application
In this thesis, the effect of Doppler shift on adaptive orthogonal frequency-division multiplex (OFDM) modulation in a cognitive radio (CR) application is investigated. We present Monte Carlo simulations of OFDM modulation in which a group or groups of subcarriers are modulated using quadrature …
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Unitary Space-Time Transmit Diversity for Multiple Antenna Self-Interference Suppression
… estimation, use of shaped offset quadrature phase shift keying (SOQPSK), hardware facility, and data throughput will be compared for each code. A realistic telemetry channel will be derived to increase accuracy of simulated results and conclusions.
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