FPGA IMPLEMENTATION OF A EUCLIDEAN DISTANCE METRIC SISO DECODER

ARNONE, L. J.; CASTIÑEIRA MOREIRA, J.; FARRELL, P. G.

Ambleside

Congreso; Tenth International Symposium in Communications Theory and Applications; 2009

LANCASTER UNIVERSITY, UK

The theory and a practical implementation of a new antilog-sum algorithm for decoding error correcting codes are described. The soft-input, soft-output (SISO) algorithm uses soft squared Euclidean distance as the metric, does not require knowledge of the signal-to-noise ratio of the received signal, and is less complex to implement than other SISO algorithms.The simplified version of this algorithm can be easily implemented on programmable logic technology such as FPGA devices because it operates using only additions and subtractions, avoiding the use of quotients and products and of floating-point arithmetic. The algorithm yields a very low complexity programmable logic implementation of a LDPC decoder with an excellent BER performance.