# Double-Sided Massive MIMO Transceivers for MmWave Communications

## TL;DR

This paper introduces practical double-sided massive MIMO transceiver architectures for mmWave communications, utilizing layered filtering and channel information to enhance performance in complex propagation environments.

## Contribution

It presents novel layered transceiver schemes for double-sided massive MIMO with practical channel info requirements, improving system complexity and performance.

## Key findings

- Eigenfilter design with eigenmode precoding maximizes sum rate.
- Layered transceiver architecture simplifies implementation.
- Performance varies with propagation conditions and interference levels.

## Abstract

We propose practical transceiver structures for double-sided massive multiple-input-multiple-output (MIMO) systems. Unlike standard massive MIMO, both transmit and receive sides are equipped with high-dimensional antenna arrays. We leverage the multi-layer filtering architecture and propose novel layered transceiver schemes with practical channel state information requirements to simplify the complexity of our double-sided massive MIMO system. We conduct a comprehensive simulation campaign to investigate the performance of the proposed transceivers under different channel propagation conditions and to identify the most suitable strategy. Our results show that the covariance matrix eigenfilter design at the outer transceiver layer combined with maximum eigenmode transmission precoding/minimum mean square error combining at the inner transceiver layer yields the best achievable sum rate performance for different propagation conditions and multi-user interference levels.