Werner Haselmayr, Bernhard Etzlinger, Andreas Springer,
"Stochastic Soft-Input Soft-Output Detection for Intersymbol Interference Channels"
: Signals, Systems and Computers (ASILOMAR), 2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems, and Computers, 11-2012
Original Titel:
Stochastic Soft-Input Soft-Output Detection for Intersymbol Interference Channels
Sprache des Titels:
Englisch
Original Buchtitel:
Signals, Systems and Computers (ASILOMAR), 2012 Conference Record of the Forty Sixth Asilomar Conference on Signals, Systems, and Computers
Original Kurzfassung:
We propose a fully-parallel low-complexity hardware architecture of a soft-input soft-output detector based on message passing on a factor graph. Conventionally, the message computation in the graph nodes consists of complex arithmetic operations on probabilities. Here, we represent probabilities by bit-serial streams and transform the arithmetic operations into simple bit-wise operations. This principle is known as stochastic computation and this is its first application to a detection algorithm. We evaluate the bit error rate (BER) performance of the stochastic detector by computer simulations of a communication system with intersymbol interference employing turbo equalization. The results show a performance loss of about 0.5dB at a BER of 10^-3 compared to the floating-point implementation of the detector.
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