On the Capacity of MIMO Weibull-Gamma Fading Channels in Low SNR Regime

Table 1

Composite channel models.

Proposed models	Channel modeling/generation	Remarks
Suzuki model [6]	A product of Rayleigh processes with the lognormal process	For nondirect line of sight communication. However, it is not suitable for direct line of sight communication
Extended Suzuki models [7]	A product of a Rice process and a lognormal process	Suitable to describe the behavior of large classes of frequency nonselective land mobile satellite channels. However, it is unable to model nonuniform scattering
Generalized modified Suzuki model [8]	A product of Weibull process and lognormal process	To model shadow fading along with inhomogeneous and anisotropic diffuse scattering.
-fading model [9]	A product of Rayleigh process and lognormal process	To model non-line-of-sight and shadowing
Weibull-lognormal fading model [10, 11]	A product of Weibull process and lognormal process	Composite model but due to lognormal distribution it faces mathematical complexity
Generalized K-fading model [12, 13]	A product of a gamma random variable and a channel matrix with i.i.d. Nakagami- entries	An accurate approximation of most of the fading and shadowing effects
Extended generalized -fading model [14, 15]	The combination of two independent Rayleigh distributed RVs with the average unit powers such that each pair of these RVs are independent, and one RV represents shadowing, and another one represents multipath fading components. Both components are distributed according to generalized Nakagami- PDFs	For modeling wireless and optical communication channels. Superior model but mathematically complex
Weibull-gamma fading model [16–21]	A product of Weibull and gamma random process	Simpler and relatively new one which is used for outdoor, indoor, communication, and radar clutters including shadowing effects