This chapter describes the use of the secrecy beamforming and precoding techniques in multiantenna wireless relay systems. Here, the multiple antennas at the relays may provide additional spatial degrees of freedom that can be further utilized to enhance secrecy. However, the extra source-to-relay transmission and the trustworthiness of the relays, i.e., whether or not the relays may also eavesdrop on the message, pose additional challenges in guaranteeing secrecy in these systems. The use of jamming or artificial noise (AN) in these scenarios is also discussed.
Relay Distributed antenna system Beamforming Precoding Artificial noise Jamming Secrecy.
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