# Frequency Domain Equalization for Single and Multiuser Generalized Spatial Modulation Systems in Time Dispersive Channels

## TL;DR

This paper introduces a low-complexity frequency domain equalization method for generalized spatial modulation in time-dispersive channels, effective for single and multiuser MIMO systems with severe intersymbol interference.

## Contribution

It proposes a novel iterative detector combining MIMO equalization, active antenna detection, and symbol demodulation for GSM systems in frequency selective channels.

## Key findings

- Effective in severe time dispersive channels
- Handles underdetermined MIMO scenarios
- Compatible with various signal constellations

## Abstract

In this letter, a low-complexity iterative detector with frequency domain equalization is proposed for generalized spatial modulation (GSM) aided single carrier (SC) transmissions operating in frequency selective channels. The detector comprises three main separate tasks namely, multiple-input multiple-output (MIMO) equalization, active antenna detection and symbol wise demodulation. This approach makes the detector suitable for a broad range of MIMO configurations, which includes single-user and multiuser scenarios, as well as arbitrary signal constellations. Simulation results show that the receiver can cope with the intersymbol interference induced by severe time dispersive channels and operate in difficult underdetermined scenarios where the total number of transmitter antennas is substantially larger than the number of receiver antennas.

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Source: https://tomesphere.com/paper/1903.12443