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Long range underwater acoustic communications are challenging since this channel is severely band limited, time varying, and has a long delay spread. A linear turbo equalizer is a good candidate for communicating over this channel, because it achieves a high level of spectral efficiency with a realizable complexity. As the channel is FIR, the convergence of the turbo equalizer is improved by recursive...
In this paper, we consider the problem of optimization of the training sequence length when a turbo-detector composed of a maximum a posteriori (MAP) equalizer and a MAP decoder is used. The initial channel estimate based on the training sequence is iteratively improved using the expectation maximization (EM) algorithm. In order to "unbias" the EM estimates, a modified version of the EM...
SC modulations (Single-Carrier) with FDE (Frequency-Domain Equalization) are promising candidates for future broadband MIMO (Multiple Input, Multiple Output) wireless systems. These modulations allow excellent performances in severely time-dispersive channels, provided that accurate channel estimates and performing decoding algorithms are available at the receiver. For this purpose, pilot symbols...
Modern communication systems are required to provide services based on high data rates burst-mode packet-data transmission, capable of operating at very low SNR conditions. Turbo codes enable the operation at low SNR, close to the Shannon limit. However, carrier frequency and phase synchronization, needed for optimal coherent performance of the receiver, still remains a problem in low SNR and short...
In this paper, a novel approach using frame-based iterative channel fading parameters estimation technique from the received data sequence exploiting orthogonal property of the space-time block (STB) code is proposed. For practical implementation of STB code, the receiver requires to estimate these parameters. Regarding this type of estimation, the inherent orthogonal nature of STB code can be exploited...
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