the destructive impact of fading environments and also bandwidth limitations are two main challenges which communication is dealing with them. these challenges can affect on the growth of wireless communication and even cause reliable communications and high data rate to be prevented. thus, ofdm (orthogonal frequency division multiplexing) modulation by using of fast calculation hardwares such ...

The destructive impact of fading environments and also bandwidth limitations are two main challenges which communication is dealing with them. These challenges can affect on the growth of wireless communication and even cause reliable communications and high data rate to be prevented. Thus, OFDM (Orthogonal Frequency Division Multiplexing) modulation by using of fast calculation hardwares such ...

Tone Reservation (TR) is one of the well-known methods for PAPR reduction of Orthogonal Frequency Division Multiplexing (OFDM) systems. In this method some sub-carriers are reserved for PAPR reduction and the symbols in these sub-carriers are selected such that the PAPR of the OFDM frame is minimized. In this paper, the iterative algorithm introduced earlier for TR method in single antenna OFDM...

The ultimate goal of Peak to Average Power Ratio (PAPR) reduction for Orthogonal Frequency Division Multiplexing (OFDM) signals is to reduce the signal’s sensitivity to nonlinearity and to improve signal quality and transmitter power efficiency. Performance evaluation has traditionally been based mainly on the PAPR distribution curves. For clipping related methods, however, tradeoffs between PA...

In this paper, we propose a new peak to average power ratio (PAPR) reduction technique by a hybrid algorithm based on a partial transmit sequence (PTS) and adaptive peak power reduction (APPR) methods. This technique is used in a system based on orthogonal frequency division multiplexing (OFDM). OFDM has orthogonally modulated sub-carriers which unexpectedly give large PAPR and tends to reduce ...

This paper briefs about the Partial Transmit Sequences for Peak-to-Average Power Ratio Reduction of OFDM Signals, PAPR reduction efficiency of this method in comparison with Companding and Clipping and some merits and demerits of using various methods of PAPR reduction. Based on the above survey the criteria for the selection of PAPR reduction is given and proposed scheme of combining PTS appro...

Multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) technology is one of the most attractive candidates for fourth generation (4G) mobile radio communication. It effectively combats the multipath fading channel and improves the bandwidth efficiency. At the same time, it also increases system capacity so as to provide a reliable transmission. However, the main d...

High Peak-to-Average Power Ratio (PAPR) is one of the challenging issues for Orthogonal Frequency Division Multiplexing (OFDM). In this paper, we propose a PAPR reduction technique, which combines Partial Transmit Sequence (PTS) and companding techniques. Some simulation results are presented, commented, and compared with the results obtained applying PAPR reduction methods already proposed in ...

MFSK (M-ary frequency shift keying) can be combined with OFDM (orthogonal frequency division multiplexing) by grouping the subcarriers into groups of M and applying MFSK modulation to each of these groups. The detection of such an OFDM-MFSK modulation scheme can be noncoherent and it is very robust against Doppler shift and Doppler spread. The noncoherent detection of OFDMMFSK allows an arbitra...