Aspects of modern wireless communications

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Presentation transcript:

Aspects of modern wireless communications Lecturer: Prof. Dr. János LEVENDOVSZKY levendov@hit.bme.hu EU-USA Atlantis Programme - Sensing Technology and Robotic Systems project FIT & Budapest University of Technology and Economics

Outline Digital baseband modulation PAM InterSymbol Interference (ISI) Matched filter receivers BER-SNR

The scheme Binary info sequence Modulator Radio channel Distortion, interference and noise Receiver (demod and detection) Received binary info sequence Analog waveform +1,+1,-1,+1 T Data speed = 1/T t Challenge: What is the best waveform fitting the channel, providing band-efficient and reliable data transfer ?

The problem with waveforms x(t) t h(t) H(f) f t This is not a band limited communication !!!

The underlying problem lies with the properties of Fourier transform H(f) f t Finite support Infinite support

An example -0.5T 0.5T 1 h(t) t Infinite support

The problem with waveforms x(t) t T H(f) f This is not a band limited communication !!!

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