Improvement of noncoherent orthogonal coding by time overlapping

D. Raphaeli*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A simple way to increase the performance of noncoherent orthogonal coding is suggested. The idea is to overlap the transmitted symbols in time using an appropriate set of symbols. The best upper bound of the possible performance improvement in terms of Eb/No when transmitting over the AWGN channel is proven to be M/(M-1). An example of a set of orthogonal symbols which can be overlapped to achieve this bound is the Walsh functions. The theory is a generalisation of the relation which exists between binary FSK and differential PSK for M-ary orthogonal noncoherent modulation.

Original languageEnglish
Pages (from-to)309-311
Number of pages3
JournalIEE Proceedings: Communications
Issue number5
StatePublished - Oct 1994
Externally publishedYes


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