Methods for determining physiological parameters based on electrical impedance measurements

A method for separating measurement signals, the method comprising:

• coupling a plurality of transducers on a surface of an object, the plurality of transducers comprising at least two excitation transducers and at least two measuring transducers;
• generating excitations on at least a subset of the plurality of transducers, the excitations driven in different configurations from at least one of the two excitation transducers;
• obtaining measurement response signals at a response detector, as acquired from the subset of the plurality of transducers in an analog format;
• spatially pre-conditioning the measurement response signals to convert the measurement response signals into spatial vectors;
• performing multiple-input-multiple-output (MIMO) processing of the spatial vectors to separate the measurement signals of a sub-space of desired physiological activities, as distinguished from a sub-space of undesired non-physiological signals;
• where the processing comprises identifying and tracking the sub-space of desired physiological activities;
• and
• classifying the measurement signals of the sub-space of desired physiological activities as respiratory information and classifying the sub-space undesired non-physiological signals as ambulatory motion information.