Pilot Synthesis for Distributed Synchronization

Multiuser Massive MIMO is ongoing wireless technology with high prospects in the distributed architecture with various system design and splitting options. Any of such solutions suffers from imperfect synchronization that can be reduced via promising Over the Air pilot exchanges. In this paper we introduce requirements and algorithm for flexible non orthogonal pilot design for time synchronization without changes to 3GPP protocol stack. Our solution decreases number of synchronization slots and solves problem of separating guard intervals.