The high Peak-to-Average-Power ratio (PAR) of Orthogonal Frequency Division Multiplexing (OFDM) transmission systems has become a significant issue in the design of modern multicarrier systems. One of the earliest and most popular techniques is tone reservation [1], where a set of unused tones (or specially reserved-tones) are exploited to generate time-domain signals to reduce the signal peaks...

In this paper we revisit the long standing problem of peak-to-average power ratio minimization in MIMO-OFDM systems, with a new angle approach on well-known scheme. Utilizing principles tone reservation, place dummy symbols, i.e., complex coefficients, unused space-frequency resources aim to jointly minimize transmit signal PAPR and self-power consumption symbols. This joint is solved using thr...

57  Abstract— OFDM (Orthogonal Frequency Division Multiplexing) is spectrally efficient modulation technique used for higher data rate transmission. Basically OFDM system is very effective technique in its way ,but main disadvantage is Peak to Average Power Ratio. This Ratio Must be reduce to perfom efficient communication. Different technique can be used to reduce it. Here in this paper propo...

The use of directional antennas in support of ad hoc networks has been considered a promising alternative to improve spatial division multiple access and throughput. In general, directional Medium Access Control (MAC) protocols are based on IEEE 802.11 standard, which was designed for omnidirectional communication. When applied to directional communication, the standard imposes a number of cons...

The mobile Worldwide Interoperability for Microwave Access (Mobile WiMAX) air interface adopts orthogonal frequency division multiple access (OFDMA) as multiple access technique for its uplink (UL) and downlink (DL) to improve the multipath performance. All OFDMA based networks including mobile WiMAX experience the problem of high peak-toaverage power ratio (PAPR). The literature is replete wit...

As we know in today world communication is increasing exponentially. We want best quality of service at economical cost and at high speed. When we look in deep how these parameters can be carried out then lots of problem arises in front of us and one of them is PAPR. There are various technique to reduce like tone injection, OFDM is a multi carrier transmission scheme. This is used in 4 generat...

To reduce the peak OFDM signals that can be distorted by the nonlinearity of power amplifiers, this project has proposed an efficient structure for implementing the tone reservation method that assigns appropriate data to reserved tones. In the proposed structure, a new binary search algorithm is proposed for the peak OFDM signal Clipping, and the FFT is replaced with an approximate DFT in whic...