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 11 of 11 for “"Symbol Timing"”.
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Low-complexity structures for digital symbol timing recovery
Symbol timing recovery (STR) is required in every digital synchronous communications receiver, since the output of the demodulator must be sampled periodically at symbol rate, at the precise sampling time instants in order to correctly recover the transmitted data. The major objective of this …
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Architectures for Symbol Timing Synchronization in MIMO Communications
Maximum likelihood symbol timing estimation for communication over a frequency non-selective MIMO fading channel is developed. The cases of known data (data-aided estimation) and unknown data (non-data-aided estimation) together with known channel and unknown channel are considered. The analysis …
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Low-jitter symbol timing recovery for M-ary QAM and PAM signals
This thesis focuses on low-jitter symbol timing recovery schemes applicable to M-ary QAM and PAM signals. Franks and Bubrowski introduced highpass prefiltering and symmetric bandpass post-filtering for jitter-free operation of a symbol timing recovery scheme using a squarer for binary signaling. We …
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Symbol Timing and Coarse Classification of Phase Modulated Signals on a Standalone SDR Platform
… SDR hardware are the Bandwidth Estimation, and Symbol Timing & Coarse Classification modules. This is the system decision path towards classification, synchronization, and demodulation of digital phase modulated signals (QAM and MPSK signal types) and also analog signals. The Digital Receiver …
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A Hardware Implementation of a Coherent SOQPSK-TG Demodulator for FEC Applications
… details for data sequence detection, symbol timing synchronization, carrier phase synchronization, and block recovery are described. This decision-directed demodulator is based on maximum likelihood principles, and is efficiently implemented by the soft output Viterbi algorithm (SOVA). …
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A new data rotation syncrhonization scheme for CP based OFDM systems
… we present a new data rotation scheme for symbol timing and carrier frequency offset (CFO) estimation of orthogonal frequency-division multiplexing (OFDM) systems. We first analyze Beeka??s cyclic prefix (CP) based joint ML estimator [2] and find that its performance can be improved when …
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A study of multilevel partial response signalling for transmission in a basic supergroup bandwidth
… this. A pilot tone scheme is used to facilitate symbol timing recovery at the demodulator. A sixth order Butterworth low pass filter approximates the ideal raised-cosine Nyquist channel. A theoretical discussion on impairments caused by deviation from this channel is given. Since the experimental …
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Modeling and Analysis of Synchronization Schemes for the TDMA Based Satellite Communication System
… experience the carrier frequency offset (CFO) or symbol timing error (STE) that may result in difficulty of signal detection and estimation. Comparing with SC systems, OFDM systems are more sensitive to synchronization errors, because these errors will lead to inter-symbol interference (ISI) and …
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Blind recognition of analog modulation schemes for software defined radio
… such as carrier frequency, bandwidth, symbol timing, and signal to noise ratio (SNR), and automatically identify modulation schemes. In this dissertation research, several fundamental SDR tasks for analog modulations are investigated, since analog radios are often used by civil …