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ADSP Final Project

ADSP Final Project. 2005/12/7. Option1: Channel Equalizer. In frequency domain. Channel H. S. +. R=S*H+N. N. Simplified Receiver. Frequency domain signal (corrupted). R ( k ) = S ( k ) *H ( k ) + N ( k ). FFT. Equalizer. 16QAM De-mapping. Channel Estimator (interpolation).

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ADSP Final Project

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  1. ADSP Final Project 2005/12/7

  2. Option1: Channel Equalizer In frequency domain Channel H S + R=S*H+N N

  3. Simplified Receiver Frequency domain signal (corrupted) R(k) = S(k)*H(k) + N(k) FFT Equalizer 16QAM De-mapping Channel Estimator (interpolation) H(l), l=8k K= 0~1023 Frequency Each pilot tone carries the known symbol 1.0 Pilot location: 8k

  4. Channel Estimator - Interpolation K= 0~1023 Frequency Each pilot tone carries the known symbol 1.0 Pilot location: 8k

  5. Equalizer • Simplest approach

  6. 16QAM Mapping Normalization (for unity power)

  7. Requirement • Please design these blocks • 1024 FFT • interpolating filter • equalizer • signal de-mapping • Fixed-point representation • How is the word-length determined? • Evaluation • MSE of channel estimates and bit error rate (BER) • Input pattern will be given one week before demonstration.

  8. Option 2: Noise Cancellation • Extract the speech signal which is contaminated by background noise and interference • Adaptive filtering Speech waveform Filter Coefficient Generation

  9. Requirement • Fixed-point representation • Evaluation • Peak signal to noise ratio (PSNR) • Clearness • Input pattern will be given before 12/14

  10. Notice • Please hand in a report (less than 4 pages) of your design and results. • The one, who did not do well in the midterm exam, will definitely be failed if he/she does not finish the project.

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