 orthogonal signals is constructed with a modulated carrier taking
 orthogonal signals is constructed with a modulated carrier taking  possible phase values, and the whole class of such sets is described with a coding procedure that employs a permutation of
 possible phase values, and the whole class of such sets is described with a coding procedure that employs a permutation of  integers. These signals are used for communication purposes, and it is shown that there exists a simple matchedfilter detector with a coding and decoding scheme that is unaffected by a phase shift and a Doppler frequency shift on the channel.
 integers. These signals are used for communication purposes, and it is shown that there exists a simple matchedfilter detector with a coding and decoding scheme that is unaffected by a phase shift and a Doppler frequency shift on the channel.