Peak to Average Power ratio Analysis and Reduction of Cognitive Radio signals

Transmitter non-linear components like amplifier, converter etc. cause distortions when a signal with high Peak to Average Power Ratio (PAPR) is transmitted without any special signal processing. High PAPR is a parameter commonly associated to the multi-carrier signals like Orthogonal Frequency Division Multiplexing (OFDM). SoftWare Radio (SWR) is another example of multi-carrier signals which promises to (de) modulate any signal, at any frequency. Thus being a multi-carrier signal, SWR signal inherits high PAPR. Also, as SWR is an enabling technology for Cognitive Radio (CR) systems, therefore CR signals also demonstrate high power fluctuations. Upon dynamic spectrum access (DSA) in CR, the situation regarding PAPR becomes even further grave as more carriers (secondary carriers) are added in an already large numbered multi-carrier signal (primary signal). This paper explores the PAPR variations on DSA in CR context. Also, the reduction of PAPR in SWR and CR is performed using an OFDM PAPR reduction method called Tone Reservation (TR). In TR, certain carriers of the data signal are reserved to create a peak reducing signal which on addition to the data signal reduce its peak power. These carriers are called peak reducing carriers (PRC). At first, PAPR is reduced for different SWR signal scenarios using TR. These scenarios include a mono-standard SWR signal containing multi-channel GSM (MC-GSM) signal and a bi-standard SWR signal containing two hypothetical wireless standards. The influence of bandwidth, position and power of PRC on the PAPR reduction performance is discussed. Finally, CR PAPR is reduced by presenting a joint DSA scheme which implies a part of secondary data carriers as PRC to reduce CR PAPR.

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