This work studies the problem of secure connection in cooperative wirelesscommunication with two relay strategies, decode-and-forward (DF) andrandomize-and-forward (RF). The four-node scenario and cellular scenario areconsidered. For the typical four-node (source, destination, relay, andeavesdropper) scenario, we derive the optimal power allocation for the DFstrategy and find that the RF strategy is always better than the DF to enhancesecure connection. In cellular networks, we show that without relay, it isdifficult to establish secure connections from the base station to the celledge users. The effect of relay placement for the cell edge users isdemonstrated by simulation. For both scenarios, we find that the benefit ofrelay transmission increases when path loss becomes severer.
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