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A new perspective on cognitive radio is presented, where the pre-existent legacy service is either uncoded or coded and a pair of cognitive transceivers need be appropriately deployed to coexist with the legacy service. The basic idea underlying the new perspective is to exploit the fact that, typically, the legacy channel is not fully loaded by the legacy service, thus leaving a non-negligible margin...
A new perspective on cognitive radio is presented for the case where the primary transmission is in uncoded analog form. The basic idea is to exploit signal-to-noise ratio margins in primary receivers, and to optimize cognitive signals by appropriately shaping their spectrum. It is shown that coexistence of primary and cognitive users is possible even without message-sharing, and furthermore, the...
Ultra-wideband (UWB) transmission utilizing transmitted-reference (TR) reception suffers from excess noise due to noisy correlation. In this paper, a digital approach is adopted to perform TR reception, circumventing technical difficulties in analog bandpass filtering. A tradeoff between signal integrity and noise suppression is identified, and based upon it, a signal-to-noise ratio (SNR) optimization...
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