Monisha Ghosh

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Research in the physical (PHY) and medium access control (MAC) layers for dynamic spectrum access (DSA) and dynamic spectrum sharing (DSS) is still at its infancy. Aspects such as spectrum sensing, coexistence, measurement and spectrum management, network reliability and QoS support in face of the need to avoid causing harmful interference into incumbents,(More)
Recent developments in spectrum policy and regulatory domains, notably the release of the National Broadband Plan, the publication of final rules for TV white spaces, and the ongoing proceeding for secondary use of the 2360 – 2400 MHz band for Medical Body Area Networks (MBANS), will allow more flexible and efficient use of spectrum in the future. These(More)
In this paper we address the issue of spectrum sensing in cognitive radio based wireless networks. Spectrum sensing is the key enabler for dynamic spectrum access as it can allow secondary networks to reuse spectrum without causing harmful interference to primary users. Here we propose a set of integrated medium access control (MAC) and physical layer (PHY)(More)
In this paper, we present the concept of cluster-based cooperation in which geographically dispersed neighboring nodes collectively transmit information to a distant receiver in the form of distributed space-time block codes. In this context, a new distributed space-time block code transmission strategy is introduced, which is not constrained by the rigid(More)
Recent FCC rules allowing unlicensed use on a secondary basis of the Television White Spaces (TVWS) promise a whole new set of possible applications. The first step towards realizing these applications is the creation and adoption of industry standards. In this paper we present the first such standard for personal/portable devices in the TVWS that complies(More)
Spectrum sensing is the key enabler for dynamic spectrum access in the television (TV) bands as it can allow secondary networks to reuse spectrum without causing harmful interference to primary users. In this paper we describe a sensing prototype that has been developed to demonstrate robust sensing of TV signals as well as wireless microphone signals in(More)
In this paper, we discuss the regulatory scenario for cognitive radio networks and give an overview of the emerging IEEE 802.22 standard, which is based on a dynamic spectrum access model, and provides new opportunities for wireless broadband access in rural area and remote communities. We discuss the main design challenges for the shared spectrum access(More)
The two criteria most commonly used in blind equalization are Sato's cost function and Godard's cost function. In this paper we analyze a sign-error cost function for real signals which gives an error term that can be viewed as the sign of either the Sato or the Godard error. We show that the conventional de nition of equalizer convergence is not suitable(More)