1 research outputs found
Interference cancellation in multiuser hybrid overlay cognitive radio
In this paper, we consider an overlay cognitive radio (CR)
consisting of a primary macro-cell and cognitive small cells of
cooperative secondary base stations (SBS).We suggest studying
a hybrid CR where a filter bank multicarrier (FBMC) is
used for the secondary users (SU) whereas the primary users
(PU) are based on orthogonal frequency division multiplexing
(OFDM). Compared to OFDM, FBMC has the advantage
of reducing the SU interference level that is induced by the
differences between the SBS and PU carrier frequency offsets
(CFO). Our contribution is threefold: 1/ we derive the
interference expression due to SU at the PU receiver, 2/ we
propose to use zero forcing beamforming (ZFBF) to cancel
the interference, 3/ a comparative study with CR based on
OFDM for both the PU and the SU confirms the efficiency of
the proposed scheme