Asynchronous signal processing for brain-computer interfaces

Authors : Seda ŞENAY, Luis F. CHAPARRO, Mingui SUN, Robert SCLABASSI, Aydın AKAN

Pages : 275-289

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Publication Date : 0000-00-00

Article Type : Research Paper

Abstract :Brain-computer interfaces insert ignore into journalissuearticles values(BCIs); provide a way to monitor and treat neurological diseases. An important application of BCIs is the monitoring and treatment of epilepsy, a neurological disorder characterized by recurrent unprovoked seizures, symptomatic of abnormal, excessive or synchronous neuronal activity in the brain. BCIs contain an array of sensors that gather and transmit data under the constrains of low-power and minimal data transmission. Asynchronous sigma delta modulators insert ignore into journalissuearticles values(ASDMs); are considered an alternative to synchronous analog to digital conversion. ASDMs are non-linear feedback systems that enable time-encoding of analog signals, from which the signal can be reconstructed. An efficient reconstruction of time-encoded signals can be achieved using a prolate spheroidal waveform insert ignore into journalissuearticles values(PSW); projection. PSWs have finite time support and maximum energy concentration within a given bandwidth. The ASDM time-encoding is related to the duty-cycle modulation and demodulation, which shows that sampling is non-uniform. For transmission of data from BCI, we propose a modified orthogonal frequency division multiplexing insert ignore into journalissuearticles values(OFDM); technique using chirp modulation. Our method generalizes the chirp modulation of binary streams with non-uniform symbol duration. Our theoretical results relate to recent continuous-time digital signal processing and compressive sampling theories.
Keywords : Key words Asynchronous sigma delta modulators ASDM, , brain computer interface BCI, , wireless OFDM communications, prolate spheroidal waveform insert ignore in