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 39 for “"PSK"”.
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Classification and Parameter Estimation of Asynchronously Received PSK/QAM Modulated Signals in Flat-Fading Channels
… and noncoherent modulation classifier for PSK/QAM modulated signals in flat-fading channels. In developing this classifier, a novel estimator for the unknown channel gain and fractional time delay is proposed which uses a method-of-moments based estimation approach. For the second research …
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An Investigation of Carrier Recovery Techniques for PSK Modulated Signals in CDMA and Mulipath Mobile Environments
The challenge of carrier recovery for digitally phase modulated, suppressed-carrier signals has been the target of much attention in mobile radio system design for many years. Code division multiple access (CDMA) cellular systems are now being deployed in mobile environments, and the performance of …
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ΜΕΛΕΤΗ ΚΑΙ ΑΞΙΟΛΟΓΗΣΗ ΤΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ Μ-ARY ΣΥΜΒΑΤΩΝ PSK ΣΥΣΤΗΜΑΤΩΝ ΨΗΦΙΑΚΗΣ ΔΙΑΜΟΡΦΩΣΗΣ ΜΙΚΡΟΚΥΜΑΤΙΚΩΝ ΔΟΡΥΦΟΡΙΚΩΝ ΖΕΥΞΕΩΝ ΠΑΡΟΥΣΙΑ ΠΑΡΕ...
… IN THE PRESENT WORK THE PERFORMANCE OF M-ARY CPSK SYSTEMS, IN THE PRESENCE OF A REALISTIC ADDITIVE COMBINATION OF GAUSSIAN AND IMPULSIVE NOISE IS ATTEMPTED. THE IMPULSIVE NOISE MODEL EMPLOYED, GIVES GOOD DESCRIPTION OF SOME REAL PHYSICAL SITUATIONS, SUCH AS MAN-MADE AND ATMOSPHERIC IMPULSIVE …
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Analysis of RF Front-End Non-linearity on Symbol Error Rate in the Presence of M-PSK Blocking Signals
… blocker reception. The work focuses on M-PSK modulation schemes. For high blocker powers and non-linearity, the Es/No (Eb/No) performance loss can be as high as 4.7 dB for BPSK modulated signal and BPSK modulated blockers when received in sync with the desired signal. When blockers have a …
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Quadrature amplitude modulated codes with low peak-to-mean envelope power ratio for orthogonal frequency division multiplexing applications
… binary Golay complementary sequences into BPSK yields OFDM signals with low PMEPR. Frank, Sivaswamy, and others have extended the results of Golay from binary phase shift keying (BPSK) to other PSK constellations. Recently, Davis and Jedwab presented a code structure for these PSK …
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Characterization and Computation of Optimal Distributions for Channel Coding
… shown to outperform the currently widely used PSK and QAM schemes at all transmission rate below the channel capacity.
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Turbo space-time coded modulation : principle and performance analysis
… Simulation results are provided for 4-PSK and 8-PSK schemes over the Rayleigh block-fading channel. It is shown that the turbo-STCM scheme features full diversity and full coding rate. The significant gain can be obtained in performance over conventional space-time codes of similar …
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Performance of dual polarized site diversity satellite communications systems
… diversity replicas is investigated for both PSK and FM modulation schemes. A new technique is proposed for combining the effects of attenuation. and isolation into a single criterion for FM systems. The thesis considers methods for improving dual polarized site diversity system performance. …
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A Framework for Spectrally Efficient Noncoherent Communication
… conventional differential phase shift keying (PSK), especially at high signal-to-noise ratio (SNR). Also, known results on the high SNR performance of multiple symbol demodulation of differential PSK are easily inferred from the noncoherent metric. (3) The GLRT interpretation is used to obtain …
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ΜΕΛΕΤΗ ΚΑΙ ΥΠΟΛΟΓΙΣΜΟΣ ΤΗΣ ΕΠΙΘΥΜΗΤΗΣ ΠΡΟΠΑΡΑΜΟΡΦΩΣΗΣ ΓΙΑ ΤΗΝ ΔΙΟΡΘΩΣΗ ΤΗΣ ΕΙΣΑΓΟΜΕΝΗΣ ΠΑΡΑΜΟΡΦΩΣΗΣ ΣΕ ΜΗ ΓΡΑΜΜΙΚΟΥΣ ΠΟΛΥΕΠΙΠΕΔΟΥΣ ΨΗΦΙ...
… 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 SUSPECTIBILETO NONLINEAR DISTORTION. AS IS KNOWN, TWT AMPLIFIERS, USED IN A SATELLITE TRANSPONDER OR A …
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Analysis, improvement and extensions of a Lee metric list decoding algorithm for alternant codes
… Lee metric codes over a Gaussian channel with a PSK or QAM modulation and to compare Lee and Hammming metrics.
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Error-rates of digital signaling with coherent and noncoherent detections
… 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. Both coherent and noncoherent detection schemes are considered. A symbol …
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A simple model for the depolarizing effects of rain and ice on earth satellite links in the 10 to 30 GHz frequency range
… on the carrier-to-noise ratio for digital PSK systems is also addressed. Preliminary results for ice layer effects are presented.
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Digital Harmonic-Cancelling Sinusoidal Signal Synthesis
… door for DHSSs to be used in phase-shift keying (PSK) communication applications. The second contribution is a method of designing DHSSs, such that the resulting DHSSs break the 6 dB/bit rule. The 6 dB/bit rule governs the compromise between spectral purity, and area and power costs in DDFSs. …
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All-semiconductor High Power Mode-locked Laser System
… (phase and polarization recovery) scheme from PSK (phase shift keying) data is proposed and demonstrated for the first time. As an application of all-optical synchronization, the characterization of advanced modulation formats using a linear optical sampling technique was studied. The full …
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A cluster of two serine transfer RNA genes from Clostridium acetobutylicum P262
… insert DNA were generated in Bluescript pKS and pSK. A range of exonuclease III deletions of this C. acetobutylicum P262 insert DNA were also generated which were shown to lose the metronidazole sensitivity phenotype on progressive deletion of the insert DNA. In vitro and in vivo protein …
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Harvesting time-frequency-space diversity with coded modulation for underwater acoustic communications
… Trellis Coded Modulation (TCM) based on an 8-PSK signal set, symbol interleaving and orthogonal frequency-division multiplexing (OFDM). The second system combines bit-interleaved coded modulation (BICM), based on a convolutional code and a 16-QAM signal set, with OFDM.
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Performance of Ds/ssma Communications in Impulsive Channels (Nongaussian, Hard Limiter)
… over a linear channel using the binary PSK direct-sequence SSMA technique. Alternatively, the effects of the non-Gaussian impulsive channel in such a system are studied by modeling the samples of noise after front-end filtering. The performance of hard-limiting correlation receivers is …
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Amplitude and phase modulation techniques for an asymmetric multi-level outphasing transmitter
… transmitter showing an EVM of less than 5% for 8-PSK modulation at maximum data rate, meeting the requirements for operation at the Medical Implant Communication Services (MICS) band.
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Enhanced Implementations for Arbitrary-Phase Spread Spectrum Waveforms
… time it changes. High-order phase shift keying (PSK) spread modulations do, however, provide an overall whiter spectral response than legacy direct sequence spread spectrum (DSSS) signals. Further, the unique ability to color the output signal spectrum offers new advantages to optimize …
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