Patent ID: 8457232
Filing Date: 2013-06-04
Classification: H04B,H04L,H04W

Abstract:
1. A method, comprising: receiving samples of training symbols that are cyclically shifted with respect to one another and transmitted from a plurality of transmit antennas; performing Fourier transform operations on the received samples of the training symbols to generate frequency-domain values associated with the received samples; multiplying the associated frequency-domain values of the received samples with known frequency-domain representations of the training symbols on each sub-carrier of a reference transmit antenna to generate multiplied values; computing a transmission channel impulse response, wherein computing the transmission channel impulse response includes performing a least square operation on the multiplied values; and detecting a number of shifted impulse responses in the transmission channel impulse response, wherein the detected number of shifted impulse responses represents a number of the transmit antennas.