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We study the physical-layer performance of a wideband multihop system in which a chain of amplify-and-forward relays is deployed for routing data from a source to a destination. The novelty of the system model w.r.t. prior work is in assuming frequency-selective multipath channels for all hops. We propose a new approach in which the channels are specified in terms of clustered exponentially decaying...
It is known for a long time that vowels can be classified using spectrum analysis and formant map templates. But in systems having poor spectral resolution, e.g. in cochlear implants, it may be interesting to see if a map of vowel classes can be constructed based on temporal cues only. We present a bio-inspired approach to extract the shape of cochlear pressure wave trajectories for speech signals...
This paper studies amplify-and-forward relaying of OFDM signals. In the considered cellular hotspot scenario, a destination node receives superposition of single-hop transmission from a source node and two-hop transmissions via full-duplex relays. We propose a novel co-phasing scheme that results in significant coherent combining gain in the destination due to subcarrier phase rotation in the relays...
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