WLC44-6: Interference Characterization in Shared Wireless Channels

An investigation carried out for a generalized Nakagami fading channel in this paper, concerns the performance degradation introduced by a field of interferers surrounding a victim receiver in a shared wireless channel. A new mathematical model adopted assumes interferers are distributed according to a Poisson process in space and frequency. Based on this model, an expression derived for average bit error probability and employed to determine spectral efficiency of the shared wireless channel which emerges is not only exact but explicit. Numerical results obtained suggests that pulse waveshaping is vital to the overall performance of the wireless system. It is found that root raised cosine filters offer improved performance compared with Gaussian filters. For example, the enhancement is as much as 16.7% spectral efficiency when compared with Gaussian filter of time-bandwidth product of 0.3. Furthermore, single tone interference are less harmful than interference that has a waveshape that is identical to the useful signal.