Reconfigurable Low Density Parity Check (LDPC) Code Interleaving for SIO and MIMO OFDM Systems

This contribution derives an algorithm for optimizing the mapping of irregular and systematic low density parity check (LDPC) code word bits onto orthogonal frequency division multiplexing (OFDM) carriers in the context of a frequency selective fading channel in both, a single-transmit single-receiv...

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Bibliographic Details
Published in2006 IEEE 7th Workshop on Signal Processing Advances in Wireless Communications pp. 1 - 5
Main Authors Muck, M., Rouquette-Leveil, S., de Courville, M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.07.2006
Subjects
Antennas and propagation
Fading
Frequency domain analysis
Interleaved codes
MIMO
OFDM
Parity check codes
Proposals
Software radio
Wireless LAN
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Summary:This contribution derives an algorithm for optimizing the mapping of irregular and systematic low density parity check (LDPC) code word bits onto orthogonal frequency division multiplexing (OFDM) carriers in the context of a frequency selective fading channel in both, a single-transmit single-receive (SISO channel) and multiple-transmit multiple-receive (MIMO channel) antennas scenario. The absolute values of the frequency domain channel coefficients are assumed to be known and the LDPC code to be given (contrary to existing proposals where the LDPC code is optimized with respect to a given propagation channel). The proposed solution can alternatively be interpreted as an adaptive interleaver (which is inherently available in software defined radio type of system implementations) optimized for a given channel impulse response. In a typical WLAN (IEEE802.11n) scenario, the proposed mapping technique improves the system performance by up to approx. 0.7 dB compared to a linear (direct) mapping
ISBN:078039710X
9780780397101
ISSN:1948-3244
1948-3252
DOI:10.1109/SPAWC.2006.346466