Cooperative Relaying in Underlay Cognitive Systems with Hardware Impairments
Nikolaos I. Miridakis, Dimitrios D. Vergados, Angelos Michalas
TL;DR
This paper analyzes the outage probability of underlay cognitive dual-hop relaying systems with multiple antennas and hardware impairments, providing closed-form and asymptotic expressions to evaluate system performance.
Contribution
It derives the first closed-form and asymptotic outage probability expressions for such systems considering hardware impairments and antenna selection schemes.
Findings
Hardware impairments significantly affect outage performance.
Antenna selection schemes improve reliability.
Asymptotic expressions reveal diversity and array gains.
Abstract
The performance of an underlay cognitive (secondary) dual-hop relaying system with multiple antennas and hardware impairments at each transceiver is investigated. In particular, the outage probability of the end-to-end (e2e) communication is derived in closed-form, when either transmit antenna selection with maximum ratio combining (TAS/MRC), or TAS with selection combining (TAS/SC) are established in each hop. Simplified asymptotic outage expressions are also obtained, which manifest the diversity and array order of the system, the effectiveness of the balance on the number of transmit/receive antennas, and the impact of hardware impairments to the e2e communication.
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