Spectral Efficiency Bounds for Interference-Limited SVD-MIMO Cellular Communication Systems

TL;DR

This paper derives bounds on the spectral efficiency of interference-limited SVD-MIMO cellular systems using stochastic geometry, providing insights into system performance and optimal stream number.

Contribution

It introduces tight bounds on ergodic spectral efficiency for SVD-MIMO systems in interference-limited cellular networks, validated by simulations.

Findings

Upper bound represents optimal system-level performance.

Spectral efficiency bounds are validated through simulations.

Conjecture on optimal number of streams proportional to pathloss exponent.

Abstract

The ergodic spectral efficiency (SE) in interference-limited multiple-input multiple-output (MIMO) downlink cellular systems is characterized based on stochastic geometry. A single user is served by using singular value decomposition precoding and combining. By approximating the expectations of the channel eigenvalues, we derive upper and lower bounds on the ergodic SE. The obtained upper bound is the best possible system-level performance of any MIMO strategy in non-cooperative cellular networks. We validate our analytical results through simulation. We also conjecture that there exists the optimal number of streams being proportional to the pathloss exponent.