Frequency Domain Multi-user Detection for Single Carrier Modulation with Cyclic Prefix

TL;DR

This paper proposes a computationally efficient frequency domain multi-user detection method for single carrier modulation with cyclic prefix in massive MIMO systems, leveraging circulant channel matrix structures for improved performance.

Contribution

It introduces a novel MMSE frequency domain multi-user detection technique that simplifies processing in TDD massive MIMO systems with cyclic prefix.

Findings

Efficient MMSE FD-MUD method developed

Shared processing steps for uplink and downlink demonstrated

Approach approaches theoretical capacity in dispersive channels

Abstract

Frequency domain (FD) multi-user detection (MUD) has been shown to be an effective means of approaching the theoretical per-user capacity for single carrier modulation (SCM) schemes in massive MIMO scenarios with highly dispersive channels. When a cyclic prefix is added to the SCM waveform, the circulant structures of the resulting convolutional channel matrix allows for relatively simple expressions for the FD detection. In this paper, we develop a computationally efficient minimum mean squared error (MMSE) FD-MUD technique in a time-division duplexing (TDD) massive MIMO setup and show how processing steps can be shared between uplink and downlink.