Figure 3

Outage probability as a function of SNR threshold γ ₀ for a DBF with M = 10 array elements. Solid lines: no CSI (∘), N = 1 (□), N = 2 (◇), N = 3 (∇). Dashed-dotted line denotes full CSI at array elements. Simulated values are denoted by (^∗). Channel amplitudes from different array elements in the second hop are random samples of a Rayleigh distribution, with unitary second raw moment (i.e., ${\overline{\gamma }}_m=1$).