Throughput Enhancement Using Multiple Antennas in OFDM-based Ad Hoc Networks under Transceiver Impairments

TL;DR

This paper develops an analytical framework to evaluate and optimize the throughput of MIMO OFDM-based ad hoc networks considering transceiver impairments like phase noise and channel estimation errors, demonstrating the benefits and limitations of multiple antennas.

Contribution

It introduces a novel analytical framework for throughput analysis of MIMO OFDM ad hoc networks under transceiver impairments, including optimization and distributed implementation.

Findings

Multiple antennas improve maximum sum throughput.

Transceiver impairments cause significant throughput loss.

Optimization can mitigate some impairment effects.

Abstract

Transceiver impairments, including phase noise, residual frequency offset, and imperfect channel estimation, significantly affect the performance of Multiple-Input Multiple-Output (MIMO) system. However, these impairments are not well addressed when analyzing the throughput performance of MIMO Ad Hoc networks. In this paper, we present an analytical framework to evaluate the throughput of MIMO OFDM system under the impairments of phase noise, residual frequency offset, and imperfect channel estimation. Using this framework, we evaluate the Maximum Sum Throughput (MST) in Ad Hoc networks by optimizing the power and modulation schemes of each user. Simulations are conducted to demonstrate not only the improvement in the MST from using multiple antennas, but also the loss in the MST due to the transceiver impairments. The proposed analytical framework is further applied for the distributed implementation of MST in Ad Hoc networks, where the loss caused by impairments is also evaluated.