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Improving the spectral efficiency of FDM‐CPM systems through packing and multiuser processing
Author(s) -
Piemontese Amina,
Mazzali Nicolò,
Colavolpe Giulio
Publication year - 2012
Publication title -
international journal of satellite communications and networking
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.388
H-Index - 39
eISSN - 1542-0981
pISSN - 1542-0973
DOI - 10.1002/sat.1006
Subject(s) - computer science , interference (communication) , decoding methods , spectral efficiency , synchronization (alternating current) , multiplexing , continuous phase modulation , transmission (telecommunications) , multiuser detection , algorithm , electronic engineering , code (set theory) , real time computing , code division multiple access , telecommunications , channel (broadcasting) , engineering , set (abstract data type) , programming language
SUMMARY In frequency division multiplexed (FDM) systems, spectral efficiency (SE) can be increased by reducing the spacing between two adjacent channels, thus increasing the relevant interference and possibly accounting for it at the receiver. In this paper, we consider a FDM system where each user employs a continuous phase modulation, serially concatenated with an outer code through an interleaver, and iterative detection/decoding. We show that, by taking into account the increased interference using properly designed multiuser detection and synchronization schemes, it is possible to implement transmission schemes with unprecedented SE at a price of a limited complexity increase with respect to a classical single‐user receiver which neglects the interference. Copyright © 2012 John Wiley & Sons, Ltd.