A NOTE ON SEQUENTIAL DECODING APPLIED TO LARGE ALPHABET INCOHERENT CHANNELS - R COMP DETERMINATION,
Abstract
Interest in large alphabet signaling systems to which sequential decoding procedures can be applied has prompted an investigation of the computation cutoff rate for such channels. This report restricts itself to incoherent channels, where the meaning of 'incoherent' will be made precise presen . Suppose one of l orthogonal and equal energy bandpass signals is sent over a channel perturbed by additive white Gaussian noise. The prior probability of all signals is assumed equal. The received signal is detected by a bank of l filters matched to the l wave forms. The envelopes of the filter outputs are formed and are sampled at the appropriate time. This detection procedure is optimum if the re ceiver does not have knowledge of the RF phase of the signal, and if the RF phase, whatever it is, is constant over the signaling interval. A decoder has available to it the l analog outputs. A decision on the largest of these destroys in formation. Accordingly, if coding is to be used, it is appropriate to view the l analog outputs as a vector which may be operated on by a decoder. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 1963
- Accession Number
- AD0410883
Entities
People
- Barney Reiffen
- Maxine H. Check
Organizations
- Massachusetts Institute of Technology