Abstract
D.Ing.
This thesis sets out to propose and analyze a cellular Direct Sequence Spread Spectrum Multiple
Access (DSjSSMA) system for the Indoor Wireless Communication (IWC) Nakagami fading
channel. The up- and downlink of the system implement Differential Phase Shift Keying (DPSK)
and Coherent Phase Shift Keying (CPSK) as modulation schemes respectively, and are analyzed
using Maximum Entropy (MaxEnt) principles due to its reliability and accuracy. As a means to
enhance system capacity and performance, different forms of diversity are investigated; for the
up- and downlink, respectively, RAKE reception and Maximum Ratio Combining (MRC) diversity
together with Forward Error Control (FEC) coding are assumed.
Further, the validity of the Gaussian Assumption (GA) is quantified and investigated under fading
and non-fading conditions by calculating the missing information, using Minimum Relative Entropy
(MRE) principles between the Inter- User Interference (IUI) distribution and a Gaussian distribution
of equal variance.