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Abstract—Cognitive radio (CR) and spatial modulation (SM)
are two exciting and emerging techniques to increase the spectrum
efficiency for 5G. In this paper, we present a novel cooperative
spectrum sharing protocol using SM. A two phases uncoded
decode-and-forward (UDF) relaying scheme is considered. A
secondary transmitter (ST) consisting of M
transmit antennas act as UDF relay for the primary system (PS). In the first
phase, a block of information bits of the primary transmitter
(PT) is mapped into two information carrying units: a symbol
which is chosen from a constellation diagram and a particular
antenna number from a set of transmit antennas. The ST is
then uses iterative- maximum ratio combining (i-MRC) to demap
the transmitted block of information bits. In the second
phase, the ST forwards the estimated primary data by activating
only one antenna based on the own secondary data. The primary
receiver is then uses i-MRC to estimate the forwarded primary
symbol and the secondary receiver uses i-MRC to estimate own
secondary data by detecting only transmit antenna indices of
the ST. As a result, mutual interference between the PS and
secondary system (SS) is avoided. We investigate the bit error
rate (BER) of the PS and SS. Simulation results show the efficacy
of the proposed system.

Index Terms—cognitive radio, cooperative relaying, spatial
modulation, interference free, spectrum sharing.

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