Abstract
In the future, there will be a growing need for more
flexible but efficient utilization of radio resources. Increased flexibility
in radio transmission, however, yields a higher likelihood
of interference owing to limited coordination among users. In this
paper, we address the problem of flexible spectrum sharing where
a wideband single carrier modulated signal is spectrally overlapped
by unknown narrowband interference (NBI) and where a
cyclic Wiener filter is utilized for nonparametric NBI suppression
at the receiver. The pulse shape design for the wideband signal is
investigated to improve the NBI suppression capability of cyclic
Wiener filtering. Specifically, two pulse shaping schemes, which
outperform existing raised cosine pulse shaping schemes even
for the same amount of excess bandwidth, are proposed. Based
on computer simulation, the interference suppression capability
of cyclic Wiener filtering is evaluated for both the proposed
and existing pulse shaping schemes under several interference
conditions and over both AWGN and Rayleigh fading channels.