A Binary Sequential Communication Scheme With Information Feedback

A variable length feedback scheme for binary constant antipodal signals with an upper bound on the decision time is proposed. In addition to the noiseless decision feedback channel a noiseless information feedback channel is used for energy saving. The performance of the scheme is derived, and the probability of error as a function of the average energy per symbol is compared to existing systems. Two of the existing systems may be obtained as limiting cases of the combined scheme considered here.