公开(公告)号：US10103928B2

公开(公告)日：2018-10-16

申请号：US15486537

申请日：2017-04-13

Applicant: National Instruments Corporation

Inventor： James Wesley McCoy ,  Lothar Wenzel

IPC: H04K1/02 ,  H04L25/03 ,  H04L25/49 ,  H04L27/36 ,  H04B1/10 ,  H04B1/04 ,  H04L27/38

Abstract: Nyquist filters for pulse shaping and related matched filters in wireless communications are disclosed that provide improved performance. The disclosed embodiments recognize that the second derivative of the raised cosine function is discontinuous in the frequency domain and that the first derivative of the square root raised cosine is discontinuous in the frequency domain. As such, a generalization for the raised cosine filter is applied, and improvements can be made to the raised cosine function time-frequency localization and ultimately to tradeoffs between inter-symbol interference and adjacent channel interference by introducing smoothness to the higher order derivatives of the frequency response.

公开(公告)号：US20170338997A1

公开(公告)日：2017-11-23

申请号：US15486537

申请日：2017-04-13

Applicant: National Instruments Corporation

Inventor： James Wesley McCoy ,  Lothar Wenzel

IPC: H04L27/36 ,  H04B1/04 ,  H04B1/10 ,  H04L27/38

CPC classification number: H04L27/366 ,  H04B1/0475 ,  H04B1/10 ,  H04L27/38

Abstract: Nyquist filters for pulse shaping and related matched filters in wireless communications are disclosed that provide improved performance. The disclosed embodiments recognize that the second derivative of the raised cosine function is discontinuous in the frequency domain and that the first derivative of the square root raised cosine is discontinuous in the frequency domain. As such, a generalization for the raised cosine filter is applied, and improvements can be made to the raised cosine function time-frequency localization and ultimately to tradeoffs between inter-symbol interference and adjacent channel interference by introducing smoothness to the higher order derivatives of the frequency response.

公开(公告)号：US10201020B2

公开(公告)日：2019-02-05

申请号：US15708664

申请日：2017-09-19

Applicant: National Instruments Corporation

Inventor： James Wesley McCoy ,  Nikhil U. Kundargi ,  Karl F. Nieman, Jr. ,  Lothar Wenzel ,  Marcus Monroe

IPC: H04W74/08 ,  H04W72/04 ,  H04B7/0456 ,  H04B7/0452

Abstract: A system and method for performing multi-user random access procedures in a mobile telecommunications network between a base station and a user equipment (UE) having a plurality of antennas includes transmitting a random access signal set (RASS) message using one or more antennas of the plurality of UE antennas. In response to receiving the RASS message, the base station transmitting a random access response physical downlink control channel (RAR-PDCCH) message. In response to receiving the RAR-PDCCH message, transmitting a reciprocity reference signal set (RRSS) signal using the plurality of UE antennas.