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3125 KSymbol/s SIN uJs - ... I COSuls 38 ,. """'" Dirital _. ,. 'Quality' control Q Q SNR (size of the clouds) • Bit swaps Noise measurements ... Timing recovery 'Pilot' tracking DPLL controls: 1}••• Digital Rotor Q £j5 Q .. . XTAL ... EOC/AOC extraction ... " • Building the modem Architecture: Line Monitoring & Pll ADSL Reference Model 01&1'" • - ... " Building the modem Cyclic Prefix • ... FFT of the signal, but: ~ ~ Channel distortion causes energy leaks between symbols Sampling window has to be perfect (ICI & 151) I.
1dB in the 7728kHz to 9936kHz frequency band, so the subsequent low-pass filter must possess about 48dB attenuation above 7728kHz. 5dB ripple with a nominal comer frequency of 1220kHz and variations within ±1O%. This intolerance to comer frequency variation means that particularly good process control of resistor and capacitor absolute values or some form of trimming is required. In addition to a similar third order Chebyshev low-pass filter, an analog high-pass filter is required in the downstream transmitter of the FDD modem to lower the DAC resolution.
Inoise : < 7nV/sqrt(Hz) • MTPR > 90dB I Q Dynamic Power (+PAR) ........ T • RX Building the modem Architedure : FFT/IFFT 46 ,.. " Outline T Introduction T Twisted pairs characteristics T Signal Description T Building the modem T Conclusions - ... ,.. , ••••• T Mature modem technology T Easy to deploy (low marginal cost) T Optimization Q Cost Q Reach Q Boord area Q Power Q Dota rote Conclusions Trends 47 .... y • - .. 26AWG; 6clB nol.. margin; Fast mode; Treilla; no dlsturbe ... i!. _ ............
