OFDM for cognitive radio: merits and challenges (original) (raw)
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An Investigation of the Various Challenges of OFDM-based Cognitive Radio
2017
Orthogonal frequency division multiplexing wideband modulation scheme is used in Cognitive Radio to transfer the data at high rate and eliminate the inter symbol interference. OFDM also provides various advantages in cognitive radio such as ease in spectrum sensing and provides interoperability to other wireless technologies such as Wi-Fi, 4G, Digital Audio Broadcasting. Beside these pros of OFDM in the cognitive radio, there are number of challenges to implement the OFDM at the physical layer of the Cognitive radio systems. These challenges are reduction in high Peak-to-Average Power Ratio, maintaining synchronization with the primary users in cognitive networks and the size of the cyclic prefix(CP) to reduce the inter symbol interference(ISI) etc. In this paper various major challenges of OFDM implementation in the Cognitive Radio networks are discussed and also how these problems can be resolved are described.
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