Patent ID: 9252862
Filing Date: 2016-02-02
CPC Classification: H04B,H04L

Claim Text:
1. A method for wireless communications in a multiple input multiple output (MIMO) communications system, comprising: receiving, at a receive antenna, a Constant Amplitude and Zero Auto Correlation (CAZAC) preamble sequence based on symbols transmitted from a plurality of transmit antennas during an initial synchronization with a base station, wherein the CAZAC preamble sequence indicates a number of transmit antennas; correlating the received CAZAC preamble sequence with a plurality of known CAZAC preamble sequences, wherein each of the known CAZAC preamble sequences corresponds with a predefined number of transmit antennas; identifying one of the plurality of known CAZAC preamble sequences as corresponding with the received CAZAC preamble sequence based on the correlation of the received CAZAC preamble sequence with the plurality of known CAZAC preamble sequences; and identifying the number of transmit antennas, wherein the number of transmit antennas is the predefined number of transmit antennas associated with the identified known CAZAC preamble sequence.