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Performances of the LDPC-Coded Adaptive Modulation Schemes in Multi-Carrier Transmissions

The paper presents the BER vs. SNR and throughput vs. SNR simulation performances of some transmission configurations based on LDPC-coded adaptive QAM modulations over a multi-carrier AWGN channel. The proposed configurations provide significant coding gains and increased throughput. It also includes a brief description of the array-based LDPC codes employed and a fast LDPC-encoding algorithm. Some considerations regarding the influences of the code parameters and of the bit-loading upon the scheme’s performances are discussed as well.