Question

The over-determined set of equations can be solved using

(a) Zero forcing

(b) Minimum mean square error

(c) Zero forcing & Minimum mean square error

(d) None of the mentioned

This question was addressed to me during an interview for a job.

Origin of the question is Equalization and Non Coherent Detection topic in section Baseband Demodulation and Detection of Digital Communications

Answer 1

Right option is (c) Zero forcing & Minimum mean square error

For explanation: The matrix x in transversal equalizer if non square with dimensions 4N+1 and 2N+1. Such equations are called as over-determined set. This can be solved by two methods called as zero forcing method and minimum mean square error method.