New schemes for improving non data-aided symbol timing recovery for QAM receivers in flat fading channels

In this paper we present a digital symbol timing synchronization algorithm based on maximum likelihood theory. The algorithm can be totally implemented in discrete time either by a DSP processor, or in a VLSI chip. The channel average fade duration (AFD) and level crossing rates (LCR) are incorporat...

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Vydáno v:	IEEE/AFCEA EUROCOMM 2000 : information systems for enhanced public safety and security s. 75 - 79
Hlavní autoři:	Nezami, M.K., Sudhakar, R.
Médium:	Konferenční příspěvek
Jazyk:	angličtina
Vydáno:	Piscataway NJ IEEE 2000
Témata:	Applied sciences Clocks Design. Technologies. Operation analysis. Testing Detection, estimation, filtering, equalization, prediction Electronics Equations Exact sciences and technology Fading Feeds Frequency synchronization Information, signal and communications theory Integrated circuits Integrated circuits by function (including memories and processors) Maximum likelihood estimation Quadrature amplitude modulation Radiocommunications Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices Signal and communications theory Signal processing algorithms Signal, noise Statistics Telecommunications Telecommunications and information theory Timing Transmitters. Receivers Fading channels Performance evaluation VLSI circuit Quadrature amplitude modulation Computer simulation Signal estimation Receiver Chip Synchronization Algorithm Implementation Average fade duration Statistical method Algorithm theory Level crossing rate Discrete time Maximum likelihood Timing Digital signal processor
ISBN:	078036323X, 9780780363236
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Popis
Shrnutí:	In this paper we present a digital symbol timing synchronization algorithm based on maximum likelihood theory. The algorithm can be totally implemented in discrete time either by a DSP processor, or in a VLSI chip. The channel average fade duration (AFD) and level crossing rates (LCR) are incorporated into a new estimation approach that improves the symbol timing recovery. The schemes are: (1) smoothed post processing (SPP) estimates, and (2) fade envelope weighted (FEW) estimates. Both schemes incorporate fading statistics into the symbol estimator in order to enhance the estimate while the signal is in fade. We first present their implementations, then compare their performance using computer simulation experiments.
ISBN:	078036323X 9780780363236
DOI:	10.1109/EURCOM.2000.874776