Abstract
A two-hop amplify and forward (AF) relay system is considered where source and destination are each equipped with multiple antennas while the relay has a single antenna. Orthogonal space-time block coding (OSTBC) is employed at the source. New exact expressions for outage probability in Rayleigh fading as well as symbol error rate (SER) expressions for a variety of modulation schemes are derived. The diversity order of the system is evaluated. Monte Carlo simulations demonstrate the accuracy of the analyses presented. Results that can be extended to relay systems with a direct source-destination link are also highlighted. To put the results in context, the two-hop system performance is then compared to that of a MIMO point-to-point system. Finally, the new analysis is applied to evaluate two-hop system performance as a function of relay location.
Highlights
Through exploiting spatial diversity, it is well known that MIMO technology can improve the reliability of wireless communication links [1]
This paper investigates the effect of simple relaying on MIMO system performance
It will be observed from simulations that the ideal relay gain provides a tight lower bound on outage probability and average symbol error rate (SER) in the case of medium-to-high SNR
Summary
It is well known that MIMO technology can improve the reliability of wireless communication links [1]. This paper investigates the effect of simple relaying on MIMO system performance. End-to-end performance of two-hop relay systems was studied in [5,6,7], including outage probability and average bit error rate (BER) in a variety of fading environments. An exact expression for outage probability was not given, and the diversity order of the system was not evaluated analytically. In [10], system performance including outage probability and average SER is determined for the special case of multiple antennas at the source and a single antenna at the destination. Exact expressions for system outage probability with both exact and ideal relay gain are derived for arbitrary antenna configurations at the source and destination. Monte Carlo simulations confirm the analytical results, compare performance between the proposed relaying system and a MIMO point-to-point system as well as evaluate the two-hop system performance as a function of relay location
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