This paper proposes architecture for SDR (Software Defined Radio) system with OFDM (Orthogonal Frequency Division Multiplexing) Technique. SDR enables runtime reconfiguration of modulation and demodulation (QPSK, 16QAM, 64QAM) inside OFDM in Hardware. The Peak to power Average Ratio is a main design consideration of OFDM, which causes a degradation problem when a power amplifier is used. A comb...

Clipping and filtering can be a simple and effective method of reducing the peak-to-average power ratio (PAPR) for an orthogonal frequency division multiplexed (OFDM) signal. To be effective the clipping must be performed on an oversampled version of the time domain signal, but this results in out-ofband (OOB) power. It has previously been shown that the OOB signals can be filtered out using a ...

Limiting the peak to average power ratio (PAPR) to an acceptable level is of great importance to MIMO-OFDM systems. Otherwise, a series of undesirable interventions due to the large PAPR is encountered, such as inter-modulation distortion and outof-band radiation. In this paper, we have proposed a modified partial transmit sequence (PTS) scheme and implemented a new selected mapping (SLM) techn...

A modified alternative signal technique for reducing peak-to-average power ratio (PAPR) in orthogonal frequency division multiplexing systems employing offset quadrature amplitude modulation (OFDM-OQAM) is proposed. Lower PAPR reduces the complexity of digital to analog converters and results in increasing the efficiency of power amplifiers. The main objective of the algorithm is to decrease PA...

Non linearity of High Power Amplifier will increase the bit error rate and hence it is necessary to perform back off from nonlinear region to linear region OFDM technology is widely used in current 4G standard. While Performing IFFT there is a possibility that some signals may be added with same phase and hence increasing peak power of signal which cease to increase peak to average power ratio ...

We propose a direct precoding plan for a solitary client numerous input–multiple-yield Orthogonal Frequency Division Multiplexing (OFDM) framework to minimize top to normal force degree (PAPR) by utilizing repetitive spatial assets at the transmitter through a particular worth decay based summed up converse. The proposed precoder focused around the summed up converse is made out of two sections...

Orthogonal Frequency Division Multiplexing (OFDM) has grown to a popular communication technique for high speed communication in the last decade. OFDM is an important member of the multicarrier modulation (MC) techniques and it has been adopted as a standard for various high data rate wireless communication systems due to its spectral bandwidth efficiency, robustness to frequency selective fadi...

Presently, orthogonal frequency division multiplexing (OFDM) as a multicarrier transmission system is widely used. Along with its advantages it has many disadvantages. One of its major drawback is high peak to average power ratio (PAPR). As with high PAPR the spectral efficiency of the high power amplifiers degrades. So it becomes necessary to maintain the efficiency of a wireless system to red...

The low peak-to-average power ratio (PAPR) in single-carrier systems has motivated the Long Term Evolution (LTE) Third Generation Partnership Project (3GPP) to adopt single carrier frequency division multiple access (SC-FDMA) as the uplink multiple access scheme. In this paper, an enhancement of a SC-FDMA system by decreasing the PAPR is focused. A combination of clipping and Pulse shaping (RRC...

Nonlinear PAPR reducers, such as clipping and companding techniques, are some simple methods used to reduce the Peak-to-Average Power Ratio (PAPR). In this paper, assuming that the baseband OFDM signal is characterized as a band-limited complex Gaussian process, we investigate the PAPR distribution of an OFDM signal when it is passed through a nonlinear PAPR reducer. The obtained PAPR distribut...