Performance of Heterogeneous Multiuser Underwater Acoustic‐Terrestrial RF Network With Outdated CSI and Receiver Diversity

ABSTRACT In this paper, an outdated channel state information‐based heterogeneous wireless communication system is analyzed, which involves an underwater multiuser acoustic sensor network, decode‐and‐forward relay, and terrestrial radio frequency destination with multiple antennas. The outdated channel state information is an utmost parameter to deal with practical conditions of underwater environment as well as of the terrestrial environment. Due to this fact, each channel is constrained to this factor in our investigation. The underwater acoustic network takes advantage of multiuser diversity based on generalized selection user scheduling, where the best user is chosen out of several active acoustic sources to continue transmitting data via relay to the destination. To boost system performance, the destination makes the use of the maximal ratio combining strategy. Moreover, each channel follows Rayleigh fading model. The closed form expressions of outage probability and average bit error rate are obtained along with their asymptotic results under the practical scenarios. The ergodic capacity and its upper bound expressions are also derived. Further, analytical results are verified with Monte‐Carlo simulation.