Sequans Communications Sa

Ioannis Xirouchakis

Serdar Sezginer

Karim El Asmar

Elena Florian

Disclosed are example embodiments of systems and methods for an interference imbalance manager (IIM). The method includes an outer loop that goes over the K subcarrier sets kand an inner loop that goes over the M dominant intra-frequency cells that IC are performed on, for each subcarrier set kthe noise plus interference power estimate of that set is initialized by N by setting: N(k)=N. The method includes, for each subcarrier set kthe IIM determine when the pilots of each cell m collide with that subcarrier set. When there is no collision, the interference plus noise of that set N(k) is not adjusted. When there is a collision the interference plus noise of that set N(k) is adjusted by removing the power contribution Eof that cell by applying the correction: N(k)=N(k)−E. The method includes looping over all considered cells M and when all adjustments are complete to N(k) for subcarrier set kthe program provides the adjusted N(k) output and exits the m loop.

Systems and methods for OFDM interference imbalance management

A method of evaluating OFDM synchronization between a transmitter and a receiver, the method carried out at the receiver and comprising, obtaining a non-coherent channel power estimate, obtaining a coherent channel power estimate, comparing the two estimates, and determining whether the receiver and the transmitter are synchronized based on the comparison.

OFDM synchronization evaluation

A method of synchronizing uplink between a UE and a cell, the method comprising determining PRACH capabilities of the UE, determining a negative timing offset for use with the transmission of at least one PRACH signal, determining an order for utilizing the negative timing offset, transmitting from the UE, at least one PRACH signal from a group of N PRACH signals, each of the at least one PRACH signals having a predetermined power level and transmitted by the UE at a time based on the negative timing offset, the order, and the PRACH capabilities of the UE.

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Colombes, France

Ioannis Xirouchakis