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A communication strategy proposed by Cover and El Gamal was until recently the best known achievable scheme over a discrete memoryless relay channel ([1], Theorem 7). This strategy combines cooperation and facilitation between the transmitter and relay. A possible improvement to this achievable region recently appeared in literature [2].We present an alternate achievability proof of the region in...
By exploiting properties of the wireless medium, network coding may provide even larger throughput increases for wireless networks than possible for wired networks. In particular, simultaneously transmitted signals are seen as noisy linear combinations at the antennas of receivers. It is thus quite tempting to use the physical layer to directly perform network coding "on the air". However,...
We investigate the effects of user cooperation on the secrecy of multiple access channels with generalized feedback (MAC-GF). We show that cooperation can increase the achievable secrecy region. We propose achievable schemes which use compress-and-forward (CAF) based transmission strategies. CAF based strategies allow users to increase their rates up to levels which are not decodable by the cooperating...
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