Amir Ghasemi

Fundamental limits of spectrum-sharing in fading environments

Amir Ghasemi, Elvino S. Sousa
IEEE Transactions on Wireless Communications
2007

Traditionally, the frequency spectrum is licensed to users by government agencies in a rigid manner where the licensee has the exclusive right to access the allocated band. Therefore, licensees are… (More)

Interference Aggregation in Spectrum-Sensing Cognitive Wireless Networks

Amir Ghasemi, Elvino S. Sousa
IEEE Journal of Selected Topics in Signal…
2008

The increasing demand for the radio spectrum along with the inefficient usage of the licensed bands has led the regulatory bodies to consider opening up the under-utilized licensed frequency bands… (More)

Opportunistic Spectrum Access in Fading Channels Through Collaborative Sensing

Spectrum scarcity is becoming a major issue for service providers interested in either deploying new services or enhancing the capacity for existing applications. On the other hand, recent… (More)

Spectrum sensing in cognitive radio networks: requirements, challenges and design trade-offs

Amir Ghasemi, Elvino S. Sousa
IEEE Communications Magazine
2008

Opportunistic unlicensed access to the (temporarily) unused frequency bands across the licensed radio spectrum is currently being investigated as a means to increase the efficiency of spectrum usage.… (More)

Asymptotic performance of collaborative spectrum sensing under correlated log-normal shadowing

Amir Ghasemi, Elvino S. Sousa
IEEE Communications Letters
2007

Collaborative spectrum sensing enables opportunistic unlicensed access to the unused portions of the licensed spectrum. We characterize the performance degradation of collaborative sensing due to… (More)

Optimization of Spectrum Sensing for Opportunistic Spectrum Access in Cognitive Radio Networks

Amir Ghasemi, Elvino S. Sousa
2007 4th IEEE Consumer Communications and…
2007

Motivated by the low utilization of the licensed spectrum across many frequency bands, sensing-based opportunistic spectrum access has recently emerged as an alternative to the outdated exclusive… (More)

Spectrum sensing in cognitive radio networks: the cooperation-processing tradeoff

Amir Ghasemi, Elvino S. Sousa
2007

Capacity of Fading Channels Under Spectrum-Sharing Constraints

Amir Ghasemi, Elvino S. Sousa
2006 IEEE International Conference on…
2006

Traditionally, the frequency spectrum is licensed to users by government agencies in a rigid manner where the licensee has the exclusive right to access the allocated band. Therefore, licensees are… (More)

Impact of User Collaboration on the Performance of Sensing-Based Opportunistic Spectrum Access

Amir Ghasemi, Elvino S. Sousa
IEEE Vehicular Technology Conference
2006

Spectrum scarcity is becoming a major issue for service providers interested in either deploying new services or enhancing the capacity for existing applications. On the other hand, recent… (More)

Statistical characterization of interference in cognitive radio networks

Amir Ghasemi
2008 IEEE 19th International Symposium on…
2008

The increasing demand for radio spectrum along with inefficient usage of the licensed bands has led the regulatory bodies to consider opening up the under-utilized licensed frequency bands for… (More)

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