naa a22 4500 510792871 CHVBK 20180411083326.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1007/s11277-012-0892-z doi (NATIONALLICENCE)springer-10.1007/s11277-012-0892-z Adaptive Bit Loading and Puncturing Using Long Single Codewords in OFDM Systems [Elektronische Daten] [Mai Abdelhakim, Mohammed Nafie, Ahmed Shalash, Ayman Elezabi] Adaptive puncturing over single codewords offers a new dimension in the family of adaptive coding and modulation techniques for communication systems. In the context of orthogonal frequency-division multiplexing systems, adaptive puncturing provides variable transmission rates across tiles within a single code-word (SCW). This contrasts with the more common multiple code-words (MCWs) structure, where variable rates are obtained using multiple codewords each is uniformly punctured. In this paper, an adaptive puncturing, interleaving, and bit loading schemes are proposed and an extensive performance evaluation is provided for both convolutional and turbo codes. The adaptively punctured SCW structure is compared to the MCWs, as well as to the per-frame adaptation. The comparisons are made using various adaptive loading methods for both constant and variable bit rate wireless applications. The SCW structure provides significantly improved goodput compared to the other two schemes, particularly for turbo-coded transmission. An analytical approximation for the goodput is obtained for both the SCW and the MCWs structures in the case of convolutional codes. The tile size effect is also investigated and it is shown that the SCW offers flexibility over the MCWs structure, since the tile size does not impose any restriction on the codeword length. Springer Science+Business Media New York, 2012 Adaptive puncturing nationallicence Adaptive modulation and coding (AMC) nationallicence Single codeword (SCW) nationallicence Multiple codewords (MCWs) nationallicence Mutual information effective SNR mapping (MIESM) nationallicence Abdelhakim Mai Center for Wireless Studies, Faculty of Engineering, Cairo University, Giza, Egypt aut Nafie Mohammed Electronics and Communications Department, Faculty of Engineering, Cairo University, Giza, Egypt aut Shalash Ahmed Center for Wireless Studies, Faculty of Engineering, Cairo University, Giza, Egypt aut Elezabi Ayman Electronics Engineering Department, American University in Cairo, Cairo, Egypt aut Wireless Personal Communications Springer US; http://www.springer-ny.com 71/2(2013-07-01), 1557-1576 0929-6212 71:2<1557 2013 71 11277 https://doi.org/10.1007/s11277-012-0892-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11277-012-0892-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Abdelhakim Mai Center for Wireless Studies, Faculty of Engineering, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Nafie Mohammed Electronics and Communications Department, Faculty of Engineering, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Shalash Ahmed Center for Wireless Studies, Faculty of Engineering, Cairo University, Giza, Egypt aut NATIONALLICENCE 700 1- Elezabi Ayman Electronics Engineering Department, American University in Cairo, Cairo, Egypt aut NATIONALLICENCE 773 0- Wireless Personal Communications Springer US; http://www.springer-ny.com 71/2(2013-07-01), 1557-1576 0929-6212 71:2<1557 2013 71 11277 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer