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qLow complexity LDPC coded IB-DFE for multilevel modulations and coded OFDM: comparison and complexity trade-offs | IEEE Conference Publication | IEEE Xplore

qLow complexity LDPC coded IB-DFE for multilevel modulations and coded OFDM: comparison and complexity trade-offs


Abstract:

In this paper, we propose IB-DFE receiver (Iterative Block Decision Feedback Equalization) with iterative SISO LDPC decoding (soft-input soft-output - Low Density Parity ...Show More

Abstract:

In this paper, we propose IB-DFE receiver (Iterative Block Decision Feedback Equalization) with iterative SISO LDPC decoding (soft-input soft-output - Low Density Parity Code) suitable for SC-FDE (Single- Carrier with Frequency-Domain Equalization) with multilevel modulations. This scheme can be implemented in a simple way using an analytical characterization where the any multilevel constellation is represented as a sum of BPSK (Bi-Phase Shift Keying) sub-constellations. This decomposition also allows energy efficient amplification compatible with grossly nonlinear amplifiers where BPSK component is amplified independently. The proposed system is compared with LDPC-coded OFDM (Orthogonal Frequency Division Multiplexing) with similar complexity. It is shown that the proposed system allows significant improvements on error performance without significant increase on decoding process' complexity. The simulation results show that the iterative equalization together with the iterative decoding of LDPC improves the performance significantly when compared with uncoded schemes, even for small block sizes. In addition, the proposed coded IB-DFE scheme outperforms coded OFDM and has similar performance to uncoded IB-DFE even for lower number of iterations in the iterative equalization process, which can contribute for reductions in the computational load at the receiver's side.
Date of Conference: 28-30 July 2014
Date Added to IEEE Xplore: 09 October 2014
Electronic ISBN:978-1-4799-3200-9
Conference Location: Heraklion, Greece

References

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