25 June 2002 Wavelet packet modulation: solving the synchronization problem
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The novel use of a Maximum Likelihood Decision-Directed (MLDD) synchronization scheme for a Wavelet Packet Modulation (WPM) System is discussed. MLDD synchronization allows symbol synchronization without edge detection. Multi-Carrier Modulation (MCM) techniques are being increasingly employed in military communication networks to combat time-dispersive and time-variant channel effects. One MCM method, Coded Orthogonal Frequency Division Multiplexing, has been particularly effective against multipath fading environments. Wavelet packet modulation has recently been introduced to address the need for improved transmission performance over channels with joint time and frequency interference components. Wavelet Packet Modulation's strength rests in a flexible, custom mapping of the desired signal on the communications channel at the transmitter to avoid a variety of a priori noise/interference patterns. The use of wavelet packet modulation on wireless channels has been hindered due to symbol synchronization not being achievable with conventional edge detection techniques. A MLDD receiver symbol timing recovery algorithm is presented here that should help expedite the adoption of WPM on wireless channels.
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Erik Kjeldsen, Erik Kjeldsen, Alan R. Lindsey, Alan R. Lindsey, Richard J. Schwartz, Richard J. Schwartz, "Wavelet packet modulation: solving the synchronization problem", Proc. SPIE 4740, Digital Wireless Communications IV, (25 June 2002); doi: 10.1117/12.472947; https://doi.org/10.1117/12.472947

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