Average Channel Capacity in a Mobile Radio Environment with Rician Statistics

Fotis LAZARAKIS  George S. TOMBRAS  Kostas DANGAKIS  

Publication
IEICE TRANSACTIONS on Communications   Vol.E77-B   No.7   pp.971-977
Publication Date: 1994/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section LETTER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
channel capacity,  Rician fading,  diversity,  

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Summary: 
The Shannon-Hartley theorem for channel capacity presupposes signal transmission over time-invariant Gaussian channels. In a mobile radio environment, communications channels have randomly time-variant characteristics. In this paper, an expression for the average capacity of Rician fading channels is derived. It is shown that the average capacity of Rician channels is always lower than that of the Gaussian channel, while the Rayleigh channel capacity values represent the worst situation. In addition, the Rician channel capacity is examined when reception by a maximal-ratio combining technique with M-branches is employed, indicating its positive effect on channel average capacity when weak signal power or severe fading conditions are present. Finally, the relation between Rician and Rayleigh fading environment with respect to channel average capacity is discussed.