Iterative demapping for OFDM with zero-padding or cyclic prefix

In this paper, we extend the iterative demapping technique, also known as turbo demodulation, to OFDM.We first introduce an inner code which serves to remove the error floor, which is present in current iterative demapping schemes. This technique is then applied to OFDM with cyclic prefix of zero-pa...

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Bibliographic Details
Main Authors: Pfletschinger, S., Sanzi, F.
Format: Conference Proceeding
Language:English
Subjects:
Additive white noise
Applied sciences
Coding, codes
Conferences
Convolutional codes
Exact sciences and technology
Fading
Gaussian noise
Information, signal and communications theory
Interleaved codes
Iterative decoding
Modulation coding
Modulation, demodulation
Multiplexing
OFDM modulation
Quadrature amplitude modulation
Signal and communications theory
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmitters
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Summary:In this paper, we extend the iterative demapping technique, also known as turbo demodulation, to OFDM.We first introduce an inner code which serves to remove the error floor, which is present in current iterative demapping schemes. This technique is then applied to OFDM with cyclic prefix of zero-padding. Using the EXIT chart, we illustrate the performance differences of various mappings and design a low-complexity inner coding scheme based on differential encoding with code doping. It is shown that this scheme removes the error floor without altering the code rate and while adding very little complexity.
DOI:10.1109/ICC.2004.1312620