Single-carrier block transmission for underwater communications

The present report assesses the performance of several receiver schemes that attempt to recover as best as possible data transmitted through an acoustic underwater channel modulating a low-frequency single-carrier wave at a high data-rate for this kind of medium. The shifted Known Symbol Padding block structure is considered robust against highly variable underwater channels, which cause severe syn- chronization problems due to significant Doppler spreading. The cho- sen receiver comprises a channel estimation stage which is based on variable training sequences. Three distinct methods are compared, and provide a basis for equalization filtering. The latter is performed on the received data to estimate the transmitted message, and it is performed both in the time-domain and in the frequency-domain in order to assess which approach delivers the best results. All of the above methods assume a time varying channel impulse response. The results obtained are later compared with a Decision Feedback Equal- izer in order to conclude if they are a reliable alternative to it.

Subject

underwater communication
single-carrier

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Embargo date

2010-08-20

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Student theses

Document type

master thesis

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thesis.pdf

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