Cardiac stimulation device and wireless communication system, without magnetic detection or magnetic control of the heart pacemaker parameters, having leads for carrying stimulating pulses to and or from one or more electrodes located in a heart and a pulse generator configured to generate stimulation pulses. In certain embodiments and environments the heart pacemaker could operate in an emergency room, even during Magnetic Resonance Imaging (MRI) diagnostic studies.A processor for connection of the stimulating pulses to and/or from one or more spread spectrum transmitter-receiver (T/R) circuits and/or from a signal processing network for receiving said stimulation pulses and for providing cross-correlated in-phase and quadrature-phase baseband signals. One or more modulators and demodulators for transmission and/or reception of one or more spread spectrum and/or cross-correlated signals.