Title :
Analogue 16-QAM demodulator
Author :
Seguin, F. ; Lahuec, C. ; Lebert, J. ; Arzel, M. ; Jezequel, M.
Author_Institution :
CNRS-TAMCIC Technopole Brest Iroise, France
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 μm BiCMOS process. Transistor level simulations validate the correct functioning of the circuit.
Keywords :
BiCMOS analogue integrated circuits; Gaussian channels; channel coding; circuit simulation; decoding; demodulators; quadrature amplitude modulation; 0.25 micron; 16 QAM I/Q signals; BiCMOS process; Gaussian channel; analogue 16 QAM demodulator; channel decoders; differential pairs; log likelihood ratios; transistor level simulations; turbo decoders;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20046146
