Abstract
The capacity of wireless networks is fundamentally limited by interference. A few research has focused on the study of the simultaneous effect of interference and correlation, and less attention has been paid to the topic of canceling simultaneous effect of interference and correlation until recently. This paper considers a secure wireless multicasting scenario through multicellular networks over spatially correlated Nakagami-m fading channel in the presence of multiple eavesdroppers. Authors are interested to protect the desired signals from eavesdropping considering the impact of perfect channel estimation (PCE) with interference and correlation. The protection of eavesdropping is also made strong reducing the simultaneous impact of interference and correlation on the secrecy multicast capacity employing opportunistic relaying technique. In terms of the signal-to-interference plus noise ratio (SINR), fading parameter, correlation coefficient, the number of multicast users and eavesdroppers and the number of antennas at the multicast users and eavesdroppers, the closed-form analytical expressions are derived for the probability of non-zero secrecy multicast capacity and the secure outage probability for multicasting to understand the insight of the effects of aforementioned parameters. The results show that the simultaneous effects of correlation and interference at the multicast users degrade security in multicasting. Moreover, the security in multicasting degrades with the intensity of fading and the number of multicast users, eavesdroppers and antennas at the eavesdroppers. The effects of these parameters on the security in multicasting can be significantly reduced by using opportunistic relaying technique with PCE. Finally, the analytical results are verified via Monte-Carlo simulation to justify the validity of derived closed-form analytical expressions.
Highlights
An important limitation to the capacity of wireless communication systems is interference, which depends upon a number of factors including the locations of interfering transmitters
In terms of the signal-to-interference plus noise ratio (SINR), fading parameter, correlation coefficient, the number of multicast users and eavesdroppers and the number of antennas at the multicast users and eavesdroppers, the closed-form analytical expressions are derived for the probability of non-zero secrecy multicast capacity and the secure outage probability for multicasting to understand the insight of the effects of aforementioned parameters
In the case of Cell-1, Figure 2 shows the probability of non-zero secrecy multicast capacity, ( Pr Csmcast > 0), as a function of the average SINR of the multicast channel for selected values of M and N
Summary
An important limitation to the capacity of wireless communication systems is interference, which depends upon a number of factors including the locations of interfering transmitters. Because of the randomness of the mobile propagation channels and limited radio spectrum, co-channel interference (CCI) and inter-symbol interference (ISI) are major impediments to high-capacity transmission in power and bandwidth-limited wireless communication systems. CCI mitigation techniques developed for single antenna systems have been applied in decoding of multi-channel data streams. For the receivers with multiple antennas, diversity combining techniques broaden the freedom in interference mitigation receiver designs. The impairments from CCI and ISI are the major obstacles to reliable communication in long-range cellular networks and in short-range wireless local and personal area networks. The interference canceling techniques designed for decoding of multiple single-user signals have been applied in decoding of spatially multiplexed data streams in MIMO systems. The impairments from high-power CCI and ISI in time-varying channels still impose severe constraints in the design of practical interference resilient receivers. Due to the increase of application areas and the mobility of users with network components, the security is a crucial aspect in wireless multicasting systems because of the fact that the medium of wireless multicasting is susceptible to eavesdropping and fraud [3]
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