UNIVERSAL DECODING FOR MEMORYLESS GAUSSIAN CHANNELS WITH A DETERMINISTIC INTERFERENCE

A universal decoding procedure is proposed for memoryless Gaussian channels with deterministic interfering signals from a certain class. The universality of the proposed decoder is in the sense of being independent of the channel parameters and the unknown interfering signal, and at the same time attaining the same random coding error exponent as the optimal maximum likelihood (ML) decoder, which utilizes full knowledge of the channel parameters and the interfering signal. The proposed decoding rule can be regarded as a continuous-alphabet version of the universal maximum mutual information (MMI) decoder.