Comparison of SC-FDMA and NC-OFDM schemes for cognitive radio networks

Haizhou, Gao

doi:10.1109/cinc.2010.5643725

2010 Second International Conference on Computational Intelligence and Natural Computing 2010

DOI: 10.1109/cinc.2010.5643725

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Comparison of SC-FDMA and NC-OFDM schemes for cognitive radio networks

Gao Haizhou

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Cited by 2 publications

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PAPR improvement in cognitive radio using interleaved SC-FDMA

Sharma

Singh

2015

2015 International Conference on Advances in Computer Engineering and Applications

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Cognitive Radio has emerged as a promising solution to the spectral congestion problem so as to enable the opportunistic users to share the unoccupied portions of licensed frequency bands. For the purpose of spectrum pooling, OFDMA based multi-carrier techniques such as NC-OFDM offers a good choice due to flexibility in deactivating the subcarriers occupied by primary licensed users to avoid interference, but suffer from high PAPR, not desirable particularly at the user equipment (UE) end. Single Carrier FDMA with localized and interleaved mapping gives lower PAPR at the UE end in the uplink. While Interleaved SC-FDMA has least PAPR along with higher frequency diversity, it requires the free subcarriers to be in a certain pattern, i.e. equi-spaced which is not guaranteed in spectrum pooling due to the fact that the total number of free subcarriers and their locations might change continuously in a dynamic spectrum access network. In this paper, we propose a spectrum allocation algorithm that gives an optimum DFT size and the bandwidth spreading factor to decide the number of users that can be allocated depending on specified required spectral efficiency so that the UE can employ Interleaved SC-FDMA to improve PAPR performance at its transmitter. The simulation results show that the algorithm aims to find an optimum DFT size that balances the required spectral efficiency with significantly reduced PAPR at the UE end as compared to NC-OFDMA and localized SC-FDMA.

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PAPR improvement in cognitive radio using interleaved SC-FDMA

Sharma

Singh

2015

2015 International Conference on Advances in Computer Engineering and Applications

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PAPR improvement in opportunistic communication systems: A novel approach

Eswaran

Bapat

2013

2013 International Conference on Recent Trends in Information Technology (ICRTIT)

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Comparison of SC-FDMA and NC-OFDM schemes for cognitive radio networks

Cited by 2 publications

References 12 publications

PAPR improvement in cognitive radio using interleaved SC-FDMA

PAPR improvement in cognitive radio using interleaved SC-FDMA

PAPR improvement in opportunistic communication systems: A novel approach

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