Digital Modulation - Vodafone Chair Mobile Communications Systems

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<strong>Digital</strong> Data Transmission (1) Transmit Filter Block diagram of the transmitter for transmitting digital data over a baseband channel Pulses of different symbols don’t overlap Ideal channel with infinite bandwidth (rectangular pulses!) can accommodate baseband transmission without signal distortion Error-free signal reconstruction possible chair TU Dresden, Gerhard Fettweis Slide 2
<strong>Digital</strong> Data Transmission (2) Transmit Filter Transmission over band-limited channel: Use a pulse shape with better localization in the frequency domain! Consequence: Each received pulse is affected by adjacent pulses. Inter-symbol interference (ISI)! ISI is a major source of bit errors at the receiver! Pulse shapes at transmitter and receiver have to be chosen carefully to minimize ISI (e. g. root-raised cosine pulses). chair TU Dresden, Gerhard Fettweis Slide 3
Page 1: Vodafone Chair Mobile Communication
Page 5 and 6: BPSK Transmission over Noisy Channe
Page 7 and 8: Eye Diagram: Noise Influence 1.5 1
Page 9 and 10: BPSK Transmission over AWGN Channel
Page 11: BPSK Transmission over AWGN Channel

Digital Modulation - Vodafone Chair Mobile Communications Systems

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