Coherence Calculation in Sparse Sensing

1. What is the mutual coherence of a unitary matrix?
2. What is sensing matrix?

What is the mutual coherence of a unitary matrix?

The mutual coherence of a matrix, defined as the maximum absolute value of the normalized inner-products between different columns, is an important property that characterizes the similarity between different matrix columns.

What is sensing matrix?

One of the most important aspects of compressed sensing (CS) theory is an efficient design of sensing matrices. These sensing matrices are accountable for the required signal compression at the encoder end and its exact or approximate reconstruction at the decoder end.