Adaptive Bit Loading and Transmit Diversity for Iterative OFDM Receivers

Authors:
Stephan Sand;Christian Mensing;Carlo Mutti;Armin Wittneben
Affiliations:
Institute of Communications and Navigation, German Aerospace Center (DLR), Wessling, Germany 82234;Institute of Communications and Navigation, German Aerospace Center (DLR), Wessling, Germany 82234;Communication Technology Laboratory, Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland CH-8092;Communication Technology Laboratory, Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland CH-8092
Venue:
Wireless Personal Communications: An International Journal
Year:
2008

Citing 4
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Abstract

In this paper, we consider a transmission system employing orthogonal frequency division multiplexing with bit-interleaved coded modulation and perfect channel state information at both transmitter and receiver. An adaptive bit loading scheme in combination with cyclic delay diversity and discontinuous Doppler diversity is proposed at the transmitter and iterative demapping and decoding at the receiver. The loading procedure minimizes the bit-error rate at the decoder output, and the transmit diversity schemes mitigate channel correlations. We analyze the iterative receiver with extrinsic information transfer charts and present the achievable gains.