56 citations · 136 across the 27 of their papers we have counts for
28 papers
Modular CSI Quantization for FDD Massive MIMO Communication
Jialing Liao, Roope Vehkalahti, Tefjol Pllaha +2
We consider high-dimensional MIMO transmissions in frequency division duplexing (FDD) systems. For precoding, the frequency selective channel has to be measured, quantized and fed…
Deterministic Patterns for Multiple Access with Latency and Reliability Guarantees
Radosław Kotaba, Roope Vehkalahti, Čedomir Stefanović +2
We study a scenario in which multiple uncoordinated devices aim to achieve reliable transmissions within a given time frame. The devices are intermittently active and access a shar…
The DMT of Real and Quaternionic Lattice Codes and DMT Classification of Division Algebra Codes
Roope Vehkalahti, Laura Luzzi
In this paper we consider the diversity-multiplexing gain tradeoff (DMT) of so-called minimum delay asymmetric space-time codes. Such codes are less than full dimensional lattices…
Non-Commutative Ring Learning With Errors From Cyclic Algebras
Charles Grover, Cong Ling, Roope Vehkalahti
The Learning with Errors (LWE) problem is the fundamental backbone of modern lattice based cryptography, allowing one to establish cryptography on the hardness of well-studied comp…
Code Design Principles for Ultra-Reliable Random Access with Preassigned Patterns
Christopher Boyd, Roope Vehkalahti, Olav Tirkkonen +1
We study medium access control layer random access under the assumption that the receiver can perform successive interference cancellation, without feedback. During recent years, a…
The DMT classification of real and quaternionic lattice codes
Laura Luzzi, Roope Vehkalahti
In this paper we consider space-time codes where the code-words are restricted to either real or quaternion matrices. We prove two separate diversity-multiplexing gain trade-off (D…