In [3] the author and his colleague Dampney showed how a new solution to view update problems based on a category theory can be used to support enterprise information system interoperation. We now have considerable experience in applying that technique in industry. One of the major applications has been to developing interoperations between large databases. The view update approach to interoper...

This paper considers Gaussian relay networks where a source transmits a message to a sink terminal with the help of one or more relay nodes. The relays work in half-duplex mode, in the sense that they can not transmit and receive at the same time. For the case of one relay, the generalized Degrees-of-Freedom is characterized first and then it is shown that capacity can be achieved to within a c...

This paper considers a cellular system with a fullduplex base station and half-duplex users. The base station can activate one user in uplink or downlink (half-duplex mode), or two different users one in each direction simultaneously (full-duplex mode). Simultaneous transmissions in uplink and downlink causes self-interference at the base station and uplinkto-downlink interference at the downli...

647 Abstract— In this letter, non-regenerative Amplify-and-Forward (AF) relay systems based on half and full duplex schemes are investigated and their performance is analyzed and compared in terms of outage probability. Although the AF relay systems have been widely investigated in many previous literatures, most of them adopted a half duplex scheme due to hardware limitation and mathematical t...

Full-duplex Infrastructure Nodes: Achieving Long Range with Half-duplex Mobiles