Patent ID: 9531573
Filing Date: 2016-12-27
CPC Classification: H04B,H04J,H04L

Claim Text:
1. A method, comprising: inserting, by a transmitter, a beam switching reference signal in an Orthogonal Frequency Division Multiplexing (OFDM) signal for transmission to a mobile station in a Multiple Input, Multiple Output (MIMO) wireless communications system; and estimating delay spread, of new beams, exceeding a current cyclic prefix of the OFDM signal using the beam switching reference signal, wherein the beam switching reference signal comprises a plurality of different time domain Zadoff Chu (ZC) sequences each based on one of a plurality of different sequence roots, wherein the ZC sequences based on the different sequence roots are inserted between sets of contiguous resource blocks in time and frequency within the OFDM signal.