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Variable LDPC coding rate performances for multicarrier systems using HD decoding

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2 Author(s)
J. -P. Cances ; ENSIL Univ. of Limoges, France ; V. Meghdadi

An adaptive coding scheme minimising the BER of a bit-interleaved coded modulation OFDM system performing hard-decisions (HD) after the demodulation and ideal interleaving is proposed. The subcarrier code rate levels subject to a rate constraint are varied according to perfect channel state information at the transmitter. The derived adaptive scheme uses low-density parity-check codes. A modified bit-flipping algorithm provides HD decoding and can be applied either alone or combined with a power loading scheme. It is shown by Monte Carlo simulations that, for broadband systems with Rayleigh fading, the loading procedure provides a signal-to-noise ratio gain up to 3dB for an average BER level of 10-5.

Published in:

IEE Proceedings - Communications  (Volume:153 ,  Issue: 1 )