Title :
On the statistics of cognitive radio capacity in shadowing and fast fading environments
Author :
Hanif, Muhammad Fainan ; Smith, Peter J.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Canterbury, Christchurch, New Zealand
fDate :
2/1/2010 12:00:00 AM
Abstract :
In this paper we consider the capacity of the cognitive radio (CR) channel in different fading environments under a "low interference regime". First we derive the probability that the "low interference regime" holds under shadow fading as well as Rayleigh and Rician fast fading conditions. We demonstrate that this is the dominant case, especially in certain practical CR deployment scenarios. The capacity of the CR channel depends critically on a power loss parameter, ¿, which governs how much transmit power the CR dedicates to relaying the primary message. We derive a simple, accurate approximation to ¿ in Rayleigh and Rician fading environments which gives considerable insight into system capacity. We also investigate the effects of system parameters and propagation environment on ¿ and the CR capacity. In all cases, the use of the approximation is shown to be extremely accurate.
Keywords :
Rayleigh channels; Rician channels; channel capacity; cognitive radio; probability; Rayleigh fading; Rician fast fading; channel capacity; cognitive radio; low interference regime; probability; shadow fading; statistics; Chromium; Cognitive radio; Fading; Interference; Probability; Propagation losses; Rayleigh channels; Rician channels; Shadow mapping; Statistics; Cognitive radio channel, capacity, low interference regime, fading channel.;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2010.02.090864