Reachback WSN connectivity: Non-coherent zero-feedback distributed beamforming or TDMA energy harvesting?Reachback WSN connectivity: Non-coherent zero-feedback distributed beamforming or TDMA energy harvesting? Peer-Reviewed Journal Publication Δημοσίευση σε Περιοδικό με Κριτές 2015-10-262014enThis work is motivated by the reachback connectivity scenario in resource-constrained wireless sensor networks (WSNs): a single terminal at maximum power cannot establish a reliable communication link with the intended destination. Thus, neighboring distributed transmitters should contribute their radios and transmission power, in order to achieve reliable transmission of a common message. This work is particularly interested in low-SNR scenarios with unreliable feedback channels, no channel state information (CSI), and commodity radios, where carrier phase/frequency synchronization is not possible. Concrete non-coherent maximum likelihood and energy detection receivers are developed for zero-feedback distributed beamforming. The proposed receivers are compared with non-coherent energy harvesting reception, based on simple time-division multiple access. It is shown that the proposed zero-feedback distributed beamforming receivers overcome connectivity adversities at the low-SNR regime. This is achieved by exploiting signals' alignment of M distributed transmitters (i.e., beamforming), even with commodity radios, at the expense of network (total) power consumption. Application scenarios include resource-constrained WSNs or emergency radio situations.http://creativecommons.org/licenses/by/4.0/IEEE Transactions on Wireless Communications1394923 - 4934 Bletsas Aggelos Μπλετσας Αγγελος Alexandris Konstantinos Αλεξανδρης Κωνσταντινος Sklivanitis Georgios Sklivanitis Georgios IEEE