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Two adaptive receivers for jointly detecting active users in an interleave division multiple access (IDMA) system are considered for highly dispersive underwater acoustic channels (UACs) using a continuous pilot approach. A direct adaptive interference cancellation (IC) IDMA receiver is proposed and compared with the standard Rake-IDMA receiver that performs adaptive semi-blind channel estimation...
Two promising single-element downlink interleave division multiple access (IDMA) receivers, employing adaptive decision feedback equalization and soft Rake-based IDMA structures, are proposed for multi-user underwater communications applications. A Chip level DFE-based receiver is optimized using the mean square error criterion (MSE), which is generated by exchanging soft information in terms of log-likelihood...
Two different single-element synchronous downlink multiple access schemes, interleave division multiple access (IDMA) and code division multiple access (CDMA) in conjunction with channel estimation, are considered for underwater communications channels. The proposed hard/soft chip channel estimation and carrier phase tracking are jointly optimized based on the mean square error (MSE) criterion and...
Two single-element downlink interleave division multiple access (IDMA) based receivers employing adaptive decision feedback equalization (DFE) and conventional soft Rake are proposed for multi-user underwater communications channels. The chip-level DFE is optimized using time-multiplexed training based on the mean square error criterion (MSE), which is generated by exchanging soft information with...
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