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The cardiorespiratory monitoring is interesting in a number of situations, the most important being the case of intensive care patients, the patients that were given sedatives, which can result in diminished reflexes, for newborn babies, etc. At present, the cardiorespiratory activity is monitored by the direct contact of the patient with the respiration sensors using the tensometric marks, capacitive sensors of motion, or the electrodes that detects the heart bioelectric activity. The proposed method refers to noncontact detection of the cardiorespiratory activity, by means of a microwaves Doppler motion detector. Another problem is to identify in the complex Doppler signal, the two components: the signal due to the cardiac activity and the signals produced by the respiration activity.