Author/Authors :
F.، Seguin, نويسنده , , C.، Lahuec, نويسنده , , J.، Lebert, نويسنده , , M.، Arzel, نويسنده , , M.، Jezequel, نويسنده ,
Abstract :
The proposed circuit demodulates 16-QAM I/Q signals over a Gaussian channel into log-likelihood ratios (LLRs). The input signals are converted using differential pairs into currents which are suitably added/subtracted to produce the values of the LLRs. These data can then be used as input by soft-input/soft-output channel decoders, either digital or analogue, such as turbo decoders. The circuit is designed for a 0.25 (mu)m BiCMOS process. Transistor level simulations validate the correct functioning of the circuit.
