Iterative Decoding of Bit-Interleaved Coded Modulation
Abstract
This thesis addresses techniques for wireless communication systems to transmit high data rates with high reliability.The investigations are focused on the bit-interleaved coded modulation (BICM) system that is the serial concatenation of a channel encoder, an interleaver and a symbol mapper for high order modulation.The performance of BICM can be greatly improved through iterative information exchange between the demapper and the decoder at the receiver.This system is usually referred to as BICM with iterative decoding (BICM-ID).The major contributions of this work are the study of the iterative BICM receiver and the investigation of modulation techniques to improve the adaptability and performance of the system: First, properties of decoder and demapper EXIT functions are derived to gain additional insights on the convergence of the iterative BICM receiver.Then, the focus is on mapping techniques, i.e. on the assignment of bit sequences to signal points of a high order signal constellation.Methods to characterize and optimize mappings for a variety of applications are investigated.In particular, mappings optimized for iterative receivers are proposed.Along the same line of thought, the combination of different signal constellations and mappings within one code word, nonunique mappings and superimposed mappings are investigated to improve the adaptability and performance of the system using modulation techniques. ZusammenfassungIn der vorliegenden Dissertation werden…
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