Tone injection with hexagonal constellation for peak-to-average power ratio reduction in OFDM
ABSTRACT One of the main drawbacks of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the OFDM signal. Tone injection (TI) technique is a promising candidate for the reduction of the PAPR of an OFDM signal. But this technique requires the increase of the transmit signal power because of the injected signal. In this paper, we propose the use of hexagonal constellation as a method to achieve PAPR reduction without increasing signal power in the TI technique
Full-textDOI: · Available from: J.M. Cioffi, May 09, 2013
- SourceAvailable from: El-Sayed Mahmoud El-Rabaie
- "The problem of the high PAPR in LFDMA can be solved using many PAPR reduction methods that have been proposed previously to the OFDMA system such as clipping , coding techniques , active constellation extension (ACE) , linear companding transform , tone reservation (TR) , tone injection (TI) , selective mapping (SLM) , partial transmit sequences (PTS) -. Comparison between these previously mentioned methods showed that PTS and SLM are the most efficient PAPR reduction techniques since they have simple implementation and no distortion in the transmitted signal . "
Conference Paper: C42. PAPR reduction for LFDMA using a reduced complexity PTS scheme[Show abstract] [Hide abstract]
ABSTRACT: Three subcarrier mapping schemes are used for single carrier frequency division multiple access (SC-FDMA) system: interleaved (IFDMA), distributed (DFDMA) and localized (LFDMA) subcarrier mapping. Comparison between these schemes showed that the peak to average power ratio (PAPR) for both IFDMA and DFDMA systems is less than that of LFDMA system. In this paper, a low complexity Partial Transmit Sequence (PTS) technique is proposed for the reduction of PAPR in LFDMA system by generating the candidates using the time domain cyclical shift of each sub-block sequence and combining them in a recursive manner. This enables the detector to recover the original signal without needing side information. In this paper, mathematical analysis is explained in details for both the conventional PTS (C-PTS) scheme and the proposed PTS (P-PTS) scheme. Also, computational complexity comparison is performed between the C-PTS and P-PTS schemes.Radio Science Conference (NRSC), 2012 29th National; 01/2012
[Show abstract] [Hide abstract]
- "The nonlinearity introduces in-band and out-of-band distortion as well. Numerous signal processing methods have been proposed to reduce the PAPR of OFDM   such as, amplitude clipping , coding , interleaving , partial transmit sequence , selected mapping , tone reservation , tone injection , and active constellation extension . Each has its own advantage and drawback. "
ABSTRACT: Physical layers of communication systems using Filter Bank Multicarrier (FBMC) as a modulation scheme provide low out-of-band leakage but suffer from the large Peak-to-Average 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 real-life applications where special requirements must be met regarding the spectral characteristics of the transmitted signal.Journal of Computer Networks and Communications 01/2012; 2012. DOI:10.1155/2012/382736
[Show abstract] [Hide abstract]
- "Therefore, all symbols have the same energy and the same conditional error probability, which is tractable at least from a theoretical viewpoint . A drawback is that the number of vertices M of an RCP is usually not a power of two, but such constellations can nevertheless be used in digital communications if a block of bits is mapped to more than one symbol , , in coded modulation , or to reduce the peak power in orthogonal frequency-division modulation systems . Furthermore, in a data communication scenario, some levels beyond a power of two are useful for framing and control purposes; indeed, 3-and 5-level modulations are already applied in standards for Fast Ethernet and Gigabit Ethernet [12, pp. "
ABSTRACT: An exact expression is derived for the symbol error probability when the vertices of the four-dimensional 24-cell are used for digital transmission in Gaussian noise. Corresponding expressions for other regular convex polytopes are summarized. Numerically stable versions of these error probabilities are also obtained.IEEE Transactions on Information Theory 07/2011; DOI:10.1109/TIT.2011.2134290 · 2.33 Impact Factor