Abstract
This paper investigates a secure transmission in the multiple-input multiple-output (MIMO) cognitive wiretap networks, where a secondary transmitter (Alice) sends data to a secondary receiver (Bob) in the presence of an eavesdropper (Eve). In order to solve the problems of inter channel interference and inter antenna synchronization encountered by traditional MIMO technologies, the antenna transmission scheme is adopted at the transmitter. As a comparison, we design two different antenna transmission schemes, namely transmit antenna selection maximal-ratio combining (TAS-MRC) scheme and differential spatial modulation maximal-ratio combining (DSM-MRC) scheme, respectively. Moreover, due to outdated channel state information (CSI) of the interference link from Alice to the primary user (PU), we propose power control mechanism to protect the quality of service (QoS) of PU. Furthermore, the closed-form for the secrecy outage probability and the secrecy throughput with TAS-MRC and DSM-MRC schemes are derived to evaluate the secrecy performance, respectively. What's more, we explore the security diversity gain and coding gain based on the asymptotic secrecy outage probability. As the results, it demonstrates that DSM-MRC requires less CSI and is convenient for modulation and demodulation, but sacrifices some secrecy performance gains between two proposed schemes.
Highlights
Cognitive radio technology was proposed by J
MOTIVATION AND CONTRIBUTION In this paper, we investigate secure transmission in the multiple-input multiple-output (MIMO) cognitive wiretap networks with outdated channel state information (CSI) of interference link to primary user (PU) over Rayleigh fading channels under two different antenna transmission schemes, transmit antenna selection maximal-ratio combining (TAS-MRC) and differential spatial modulation maximal-ratio combining (DSMMRC) schemes, in which the secondary transmitter (Alice) transmits private information to the secondary receiver (Bob) in the presence of an eavesdropper (Eve)
In order to solve the problems of ICI and inter antenna synchronization (IAS) faced by traditional MIMO technology, difference spatial modulation (DSM) technology was introduced at the Alice to facilitate the modulation and demodulation at Bob without CSI
Summary
Cognitive radio technology was proposed by J. In 2003, the Federal Communications Commission (FCC) gave the specification definition as a technology that can guide the communication system to adjust the performance parameters and transmission strategies to effectively use the licensed spectrum. It means that under the premise of not affecting the quality of service (QoS) of primary users (PUs), secondary users detect available frequency bands through spectrum sensing technology, use spectrum judgment to select the best available frequency band, and use spectrum sharing to negotiate with primary users to access the spectrum and carry out their communication tasks [2], [3].
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