Reference signal with low power imbalance and low peak-to-average power ratio in mobile communications

Abstract

Various examples and schemes pertaining to reference signals with low power imbalance and low peak-to-average power ratio (PAPR) in mobile communications are described. A processor of an apparatus generates a multi-port multi-symbol reference signal (RS). The processor then controls a transmitter to transmit the multi-port multi-symbol RS through a plurality of antenna ports. In generating the multi-port multi-symbol RS, the processor performs either or both of: (1) modifying a time-domain orthogonal cover code (TD-OCC) pattern for code-division multiplexing (CDM) with respect to the multi-port multi-symbol RS such that time-domain power imbalance is reduced; and (2) performing a permutation on a respective sequence of each CDM group of a plurality of CDM groups with respect to the multi-port multi-symbol RS such that a peak-to-average power ratio (PAPR) is reduced.

Description

[0001] cross reference [0002] This invention is a part of a non-provisional application claiming priority to U.S. Patent Application Nos. 62 / 738,004 and 62 / 754,665, filed September 28, 2018 and November 2, 2018, respectively, and a part of a provisional application , claiming priority to U.S. Patent Application No. 16 / 576,767, filed September 20, 2019, the subject matter of each of which is incorporated herein by reference. technical field [0003] The present invention relates generally to mobile communications. In particular, it relates to reference signals with low power imbalance and low peak-to-average power ratio (PAPR) in mobile communications. Background technique [0004] Unless otherwise indicated, the approaches described in this section are not prior art to the claims that follow and are not admitted to be prior art by inclusion in this section. [0005] Release 15 (Rel-15) of the 3rd Generation Partnership Project (3GPP) standard for New Radio (NR) addresse...

AI Technical Summary

Problems solved by technology

The joint effect of spatial linear precoder and OCC mode leads to no signal at some fixed resource element (RE) positions in the physical resource block (RPB) where the DMRS port resides

As a result, there will be no signal at all RE locations in some Orthogonal Frequency Division Multiplexing (OFDM) symbols

Also, DMRS specified in Release 15 can have high PAPR issues which can be caused by merging identical sequences assigned to different CDM groups (up to phase rotation)

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