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EE 445S Real-Time Digital Signal Processing Lab Fall 2013
Lab #5.2 PAM Symbol Clock Recovery Chao Jia
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Outline Recap: The Symbol Clock Recovery Block in the Receiver.
Symbol Clock Recovery: Step by Step.
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Symbol Clock Recovery: Recap
In PAM systems, the receiver has no perfect knowledge of the transmitter’s symbol clock frequency The symbol clock recovery module is used to recover the transmitter’s symbol frequency.
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Symbol Clock Recovery: Prefiltering
Recall from last time: If we define g(t) to be equal to: Then the output of the receive filter is:
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Symbol Clock Recovery: Prefiltering & Squaring
Under the assumption of no additive noise in the channel:
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Symbol Clock Recovery: Squaring
Fourier Series Expansion
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Symbol Clock Recovery: Bandpass and PLL
: a bandpass filter centered half of the symbol rate. Then except for k = -1,0,1 : a bandpass filter centered at the symbol rate. Then except for k=-1,1 is a sinusoid signal at the symbol clock frequency is a sinusoid with a slowly varying amplitude and phase Design the two filters using fdatool and implement them using code in lab3 (biquads)
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