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EE 445S Real-Time Digital Signal Processing Lab Fall 2013

EE 445S Real-Time Digital Signal Processing Lab Fall 2013. Lab #5.2 PAM Symbol Clock Recovery Chao Jia. Outline. Recap: The Symbol Clock Recovery Block in the Receiver. Symbol Clock Recovery: Step by Step. Symbol Clock Recovery: Recap.

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EE 445S Real-Time Digital Signal Processing Lab Fall 2013

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  1. EE 445S Real-Time Digital Signal Processing LabFall 2013 Lab #5.2PAM Symbol Clock RecoveryChao Jia

  2. Outline • Recap: The Symbol Clock Recovery Block in the Receiver. • Symbol Clock Recovery: Step by Step.

  3. 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.

  4. 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:

  5. Symbol Clock Recovery: Prefiltering & Squaring Under the assumption of no additive noise in the channel:

  6. Symbol Clock Recovery: Squaring Fourier Series Expansion

  7. 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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