Article
Tone injection with hexagonal constellation for peaktoaverage power ratio reduction in OFDM
Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ.
IEEE Communications Letters (Impact Factor: 1.16). 10/2006; DOI: 10.1109/LCOMM.2006.1714532 Source: DBLP

Conference Paper: New PMEPR bounding analysis for coded OFDM transmitters
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ABSTRACT: In this work, we derive the PMEPR upper bound for the concatenation of OFDM (orthogonal frequencydivision multiplexing) sequences. This new study enables people to construct the longer OFDM sequences from the shorter ones. We investigate how the PMEPR (peaktomeanenvelopepower ratio) upper bound changes as sequences of different lengths and PMEPRs concatenate. Our new theoretical results are crucial for the PMEPR control of OFDM sequences since it is harder to construct long sequences possessing good properties and concatenating several shorter sequences can be an effective alternative solution in practice.Global Communications Conference (GLOBECOM), 2012 IEEE; 01/2012  [Show abstract] [Hide abstract]
ABSTRACT: Physical layers of communication systems using Filter Bank Multicarrier (FBMC) as a modulation scheme provide low outofband leakage but suffer from the large PeaktoAverage Power Ratio (PAPR) of the transmitted signal. Two special FBMC schemes are investigated in this paper: the Orthogonal Frequency Division Multiplexing (OFDM) and the Staggered Multitone (SMT). To reduce the PAPR of the signal, time domain clipping is applied in both schemes. If the clipping is not compensated, the system performance is severely affected. To avoid this degradation, an iterative noise cancelation technique, Bussgang Noise Cancelation (BNC), is applied in the receiver. It is shown that clipping can be a good means for reducing the PAPR, especially for the SMT scheme. A novel modified BNC receiver is presented for SMT. It is shown how this technique can be implemented in reallife applications where special requirements must be met regarding the spectral characteristics of the transmitted signal.Journal of Computer Networks and Communications. 01/2012; 2012.  [Show abstract] [Hide abstract]
ABSTRACT: L'OFDM (Orthogonal Frequency Division Multiplexing) souffre d'une grande variation d'amplitude caractérisée par un PAPR (PeaktoAverage Power Ratio) élevé. La "Réservation Tone" (TR) est une technique de réduction de PAPR qui utilise un ensemble de porteuses réservées pour transmettre le "signal de réduction du PAPR". Du fait que, la TR ne dégrade pas la qualité de la transmission et garantit une compatibilité descendante, elle est de loin une des techniques les plus utilisées pour la réduction du PAPR des signaux OFDM. Dans cet article, il s'agit, par filtrage numérique à base de FFT/IFFT, de transformer les techniques "ajout de signal" de réduction du PAPR en TR afin de bénéficier des avantages de la TR.01/2009;
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