How are Radix-8 and Radix-2^3 FFT are related?
Are they same?
I got some more details in IEEE paper by S.He and M. Torkelson, "Designing pipeline FFT processor for OFDM (de)modulation," in Proc. Int. Symp. Signals, Syst., 1998, pp. 257-262.
FFT Radix 2^3 has complexity of radix 8 but has a structure as that of radix-2.