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In this paper, a comparison among different cooperative spectrum sensing approaches is provided. It is assumed that the secondary terminals autonomously perform local spectrum sensing and forward their decision to a fusion center. It combines the received data to obtain the global decision, i.e. the presence or the absence of the primary user in the(More)
In the present paper one of the main problems of cognitive radios, that is how to allow the secondary (cognitive) users to exploit the unused resources by primary users, is faced by introducing multiple antennas at the cognitive terminals. Under the assumption of perfect channel state information (CSI), a transmit beamforming scheme based on a linear(More)
— This paper presents a new uplink beamforming technique applied to the WCDMA system, here called partial-adaptive beamforming. Instead of concentrating upon the performance of every single user, the radiation pattern aims to maximize the performance of a group of users and only a limited number of beams has to be formed. We present two algorithms that(More)
This paper deals with the definition and the implementation of a Wideband Directional Channel Model (WDCM) based on the COST 259 recommendations. Cluster of replicas are introduced by means of Tapped Delay Line (TDL). Macro, Micro and Pico cells models are considered in different general radio environments. Proposed channel model can be used in a Link Level(More)
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