Wireless Base Station with Reduced Crest Factor

In this paper computationally efficient signal shaping strategy is developed that can be used to substantially reduce the PAPR in multiband transmitters. In this report, we provide mathematical framework for design and analysis of PAPR reduction for multi-band transmitters. This paper addresses the problem of crest factor reduction ICFR) in multi-carrier WCDMA systems. A trade-off analysis for design and optimization of the PAPR reduction algorithm within the context of the error vector magnitude (EVMI and adjacent channel leakage ratio (ACLR) quality metrics are discussed.MC-CDMA is currently being investigated by many researchers as a promising candidate for future generations of wireless systems due to robustness to frequency selective fading, high spectral efficiency, and higher flexibility. However, the main drawback is the high Peak to Average Power Ratio (PAPR). In this paper, a method has been proposed to reduce PAPR in synchronous MCCDMA. Introduction:Crest Factor The Crest Factor is equal to the peak amplitude of a waveform divided by the RMS value[1,2]. The purpose of the crest factor calculation is to give an analyst a quick idea of how much impacting is occurring in a waveform. Impacting is often associated with roller bearing wear, cavitations and gear tooth wear. In a perfect sine wave, with amplitude of “1”, the RMS value is equal to .707, and the crest factor is then equal to 1.41. A perfect sine wave contains no impacting and therefore crest factors with a value higher than 1.41 imply that there is some degree of