A Novel Tight Closed-Form Capacity Analysis for Rician Fading Wireless Channel Using Small Limit Argument Approximation

We employ the small limit argument approximation (SLAA) to streamline the mathematical representation of a conventional Rician fading channel within the proposed single-input single-output (SISO) system model. The SLAA on the zeroth-ordered modified Bessel function of the first kind facilitates the transition of a newly modified Rician fading channel into the low signal-to-noise ratio (SNR) regime, where either the transmission power is low or the bandwidth is large. We reveal that, for a SISO system with an instantaneous SNR set at 20 dB and a Rician factor set at 0.05, the channel capacity amounts to 7.1 bits/s/Hz.