Principles of Digital Transmission: With Wireless Applications
Principles of Digital Transmission: With Wireless Applications
IEEE Transactions on Communications
Analysis and design of symbol mappers for iteratively decoded BICM
IEEE Transactions on Wireless Communications
Low complexity iterative decoding for bit-interleaved coded modulation
IEEE Transactions on Wireless Communications
Detection of random signals in Gaussian mixture noise
IEEE Transactions on Information Theory - Part 2
Bit-interleaved coded modulation
IEEE Transactions on Information Theory
Error probability analysis of bit-interleaved coded modulation
IEEE Transactions on Information Theory
IEEE Journal on Selected Areas in Communications
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Bit-interleaved coded modulation (BICM) is often the method of choice for multilevel transmission over fading channels. If relatively simple forward error-correction (FEC) codes such as convolutional codes are employed, iterative decoding between demapper and FEC decoder can provide significant performance improvements over non-iterative decoding. To keep the complexity of iterative decoding low, the use of hard-decision feedback from FEC decoder to demapper is appealing. However, the price to be paid is a performance degradation due to feedback errors. In this letter, two new demapper designs are developed which are able to strongly mitigate the effect of erroneous feedback. The key ideas are (a) the use of an estimate of the average error rate for the hard-decision feedback and (b) the interpretation of feedback errors as additive impulsive noise. Simulation results show that the proposed designs achieve error rates close to those for iterative decoding with soft feedback, while they maintain the complexity advantage of using harddecision feedback.