Abstract
In this paper we derive an infinite tree code ensemble upper bound on the\nuth(\nu \leq 1)moments of the computational effort connected with sequential decoding governed by the Fano \footnote[1]{algorithm}. It is shown that the\nuth moment of the effort per decoded branch is hounded by a constant, provided the transmission rateR_{0}satisfies inequality (2), This result, although often conjectured, has previously been shown to hold only for positive integral values of\nu. For a wide class of discrete memoryless channels (that includes all symmetric channels), our bounds agree qualitatively with the lower bounds of Jacobs and Berlekamp [8].

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