US 12,267,197 B2
Ambiguity/aliasing cancellation or reduction for staggered reference signals
Mohammad Alawieh, Erlangen (DE); Ernst Eberlein, Erlangen (DE); Marcus Großmann, Erlangen (DE); and Birendra Ghimire, Erlangen (DE)
Assigned to Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed by Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V., Munich (DE)
Filed on Apr. 28, 2022, as Appl. No. 17/731,493.
Application 17/731,493 is a continuation of application No. PCT/EP2020/081187, filed on Nov. 5, 2020.
Claims priority of application No. 19207826 (EP), filed on Nov. 7, 2019; and application No. 19209790 (EP), filed on Nov. 18, 2019.
Prior Publication US 2022/0271982 A1, Aug. 25, 2022
Int. Cl. H04L 27/26 (2006.01); H04W 72/04 (2023.01); H04W 72/0453 (2023.01)
CPC H04L 27/2621 (2013.01) [H04L 27/2602 (2013.01); H04W 72/0453 (2013.01)] 28 Claims
OG exemplary drawing
 
1. An apparatus for a wireless communication system, the apparatus comprising:
one or more antennas or an antenna array having a plurality of antenna elements, and
a transceiver,
wherein, the apparatus is to transmit a reference signal on a common set of resource elements, REs, the common set of REs used by one or more further apparatuses in the wireless communication system to transmit the reference signal so that the reference signals of the apparatus and of the one or more further apparatuses use the same REs,
wherein the apparatus is to
transmit the reference signal using a plurality of OFDM symbols, each OFDM symbol comprising a comb structure, and some or all of the OFDM symbols comprising different comb offsets, and
apply a same sequence to each OFDM symbol, the sequence comprising a zero auto correlation property, the apparatus and the one or more further apparatuses using for a common RE the same sequence, and
wherein the apparatus is to apply a phase correction to an OFDM symbol before transmission, wherein the phase correction is applied in a time domain or in a frequency domain by multiplying the OFDM symbol with a correction factor ejφc, and wherein, for reducing phase discontinuities during SRS de-staggering, the correction factor ejφc depends on a comb factor and the comb offset of the OFDM symbol and is independent of the resource element.