CCV, gains and limits.

Spectrum Sensing Via Reconfigurable Antennas: Fundamental Limits and Potential Gains

We propose a novel paradigm for spectrum sensing in cognitive radio networks that provides diversity and capacity benefits using a single antenna at the Secondary User (SU) receiver. The proposed scheme is based on a reconfigurable antenna: an antenna that is capable of altering its radiation characteristics by changing its geometric configuration. Each configuration is designated as an antenna...

Generalized Covering Groups and Direct Limits

[hal-00923417, v1] Capacity Limits and Multiplexing Gains of MIMO Channels with Transceiver Impairments

The capacity of ideal MIMO channels has an highSNR slope that equals the minimum of the number of transmit and receive antennas. This letter shows that physical MIMO channels behave fundamentally different, due to distortions from transceiver impairments. The capacity has a finite upper limit that holds for any channel distribution and SNR. The high-SNR slope is thus zero, but the relative capa...

Comparing gains and losses.

Loss aversion in choice is commonly assumed to arise from the anticipation that losses have a greater effect on feelings than gains, but evidence for this assumption in research on judged feelings is mixed. We argue that loss aversion is present in judged feelings when people compare gains and losses and assess them on a common scale. But many situations in which people judge and express their ...

Pains, gains, and midbrains.

O ne of the main aims of neuroscience is to understand how the CNS deals with and adapts to external inputs and internal events. The altered molecular and cellular events form a basis for abnormal processing that underlies physiopathological events. Understanding these events can allow translation from bench science to the patient, and a key step in this process is using models of a clinical co...