The proposed technique, named Rotation Invariant Subcarrier Mapping (RISM), is a novel scheme for subcarriers data mapping, where the symbols belonging to the modulation alphabet are not anchored, but maintain degrees of freedom. In other words, a bit tuple is not mapped on a single point, rather it is mapped onto a geometrical locus,which is totally or partially rotation invariant. The final positions of the transmitted complex symbols are chosen by an iterative optimization process to minimize the PAPR of the resulting OFDM symbol.Numerical results confirm that RISM makes OFDM usable even in severe non-linear channels.
Rotation-Invariant Sub-Carrier Mapping: A Novel Technique Enabling Quasi-Constant OFDM Envelope / S. Rosati; E. A. Candreva; G. E. Corazza;. - ELETTRONICO. - (2010), pp. 436-443. (Intervento presentato al convegno 5th Advanced satellite multimedia systems conference (asms) 2010 and the 11th signal processing for space communications workshop (spsc) tenutosi a Cagliari, Italy nel 13-15 Sept. 2010).
Rotation-Invariant Sub-Carrier Mapping: A Novel Technique Enabling Quasi-Constant OFDM Envelope
ROSATI, STEFANO;CANDREVA, ENZO ALBERTO;CORAZZA, GIOVANNI EMANUELE
2010
Abstract
The proposed technique, named Rotation Invariant Subcarrier Mapping (RISM), is a novel scheme for subcarriers data mapping, where the symbols belonging to the modulation alphabet are not anchored, but maintain degrees of freedom. In other words, a bit tuple is not mapped on a single point, rather it is mapped onto a geometrical locus,which is totally or partially rotation invariant. The final positions of the transmitted complex symbols are chosen by an iterative optimization process to minimize the PAPR of the resulting OFDM symbol.Numerical results confirm that RISM makes OFDM usable even in severe non-linear channels.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
