Comparison of PAPR reduction techniques in OFDM based Cognitive Radio

摘要

Cognitive Radio technology is a promising solution to utilize the licensed frequency band in opportunistically. OFDM is a multicarrier modulation scheme. It provides the number of benefits when it is implemented at the physical layer of the cognitive radio such as ease in spectrum sensing, reducing the Inter Symbol Interference, flexible in adapting to environment conditions, provides interoperability with other wireless technologies and shaping the spectrum. Besides its pros, there are two drawbacks of the OFDM based cognitive radio system are high PAPR and high side lobe power radiation. High PAPR produces the interference with primary users and also induces the inter channel interference. In this paper various PAPR reduction techniques are analyzed and the comparison of them is also discussed.