Proactive Relay Selection With Joint Impact of Hardware Impairment and Co-Channel Interference

Abstract

In this paper, we investigate the end-to-end performance of dual-hop proactive decode-and-forward relaying networks with N th best relay selection in the presence of two practical deleterious effects: i) hardware impairment and ii) cochannel interference. In particular, we derive new exact and asymptotic closed-form expressions for the outage probability and average channel capacity of N th best partial and opportunistic relay selection schemes over Rayleigh fading channels. Insightful discussions are provided. It is shown that, when the system cannot select the best relay for cooperation, the partial relay selection scheme outperforms the opportunistic method under the impact of the same co-channel interference (CCI). In addition, without CCI but under the effect of hardware impairment, it is shown that both selection strategies have the same asymptotic channel capacity. Monte Carlo simulations are presented to corroborate our analysis.

Analysis of Probability of Non-zero Secrecy Capacity for Multi-hop Networks in Presence of Hardware Impairments over Nakagami-m Fading Channels

“…In this case, the authorized node T n and the eavesdropper E are assumed to have the same hardware structure (e.g., both are mobile users), hence their hardware impairment levels are same (see [13]). Then, from (10), the PoNSC at the nth hop is formulated by…”

“…In practice, the transceiver hardware is imperfect due to phase noises, amplifier-amplitude non-linearity and in phase and quadrature imbalance (IQI) [12], [13], which degrades performances of wireless relay networks. The authors in [14] studied the effects of the IQI on the secrecy capacity of the wiretap channel.…”

Impact of improper Gaussian signaling on hardware impaired systems

“…The accumulative effect of all forms of hardware imperfections is modelled as a zero mean circularly-symmetric complex Gaussian random variables [6]- [9]. However.…”

Optimal Power Allocation for OFDMA Systems under I/Q Imbalance

“…Instead, the essential image rejection is achieved through signal processing methods. Direct-conversion architectures are low cost and can be easily integrated on chip, which render them excellent candidates for modern wireless technologies [1], [2]. However, they are typically sensitive to front-end radio frequency (RF) impairments, which are often inevitable due to components mismatch and manufacturing defects [3]- [7] An indicative example is the in-phase (I) and quadrature (Q) imbalance (IQI), which corresponds to the amplitude and phase mismatch between the I and Q branches of a transceiver and ultimately leads to imperfect image rejection that incurs considerable performance degradation [8], [9].…”