data&signals4

# data&signals4 - low = 0 Since a digital signal is a...

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Digital Signals Bit Rate: “non-periodic” digital signals are the most used in digital data transfer, hence period or frequency are not used, instead we use “Bit rate” which is the number of bits T x per sec. Bit length = propagation speed * bit duration (distance one bit occupies on the T x medium) Bit interval: Time to T x a bit = 1/bit rate = s/b Baud rate : Number of distinct changes (in signal) over the medium per sec Bit rate = Baud rate X number of bits per a signal change In binary signals encoding, bit rate = baud rate (why?) Transmission of Digital Signals: 1) Baseband: We use low-pass channel with its BW starting from 0 (i.e., f

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Unformatted text preview: low = 0). Since a digital signal is a composite analog signal with infinite BW, the idle case is to have low-pass channel with infinite bandwidth (not in real life!). Yet, we can still send only the signal’s frequency components with significant amplitudes within some acceptable threshold for minimum distortion and receive a reasonably acceptable digital signal at the receiver. As the bit rate increases, the signal significant BW (BW ss ) increases, hence we need a wider medium low-pass wider BW (BW m ) For safe digital signal reception: BW m >= BW ss...
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