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In this paper, a communication network using single carrier with cyclicprefix modulation over frequency selective channels is considered, where anaccess point provides connectivity to a legitimate destination through multipletransmitters with unreliable backhaul links in the presence of an eavesdropper.A sub-optimal and an optimal transmitter selection scheme are proposed toimprove the secrecy of the system, depending on whether the active backhaulchannel knowledge is available a priori or not. The secrecy outage probability(SOP) and its asymptotic limit are presented in closed-form. This provides someinsights regarding how knowledge of the active backhaul links affects thesecrecy performance of the network. Our results show that the optimaltransmitter selection scheme obtains a larger benefit than the sub-optimalscheme from the knowledge of the active backhaul links, resulting in asignificantly improved system performance; however, the sub-optimal transmitterselection scheme can reduce the complexity and feedback overhead.

Transmitter Selection for Secrecy in a Frequency Selective Fading Channel with Unreliable Backhaul