Patent ID: 8687480
Filing Date: 2014-04-01
Classification: H04B,H04J,H04L

Abstract:
1. A method for single carrier frequency division multiple access (SC-FDMA) uplink transmission diversity in a wireless communication device having N A antennas, N A =2, the method comprising: for a group of N modulated data symbols: performing an N-point discrete Fourier transform (DFT) on the N modulated data symbols to generate a set of N frequency domain components of the N modulated data symbols; mapping the N frequency domain components of the N modulated data symbols to N sub-carriers in a sub-band M sub-carriers wide (M>N) to generate a set of M complex subcarrier amplitudes; performing an M-point inverse discrete Fourier transform (IDFT) on the set of M complex sub-carrier amplitudes to generate a reference sequence of M discrete time domain values; generating a cyclic shift delayed version of the reference sequence of M discrete time domain values that is cycle shifted by M/4 relative to the reference sequence; transmitting an SC-FDMA signal on one of the N for the other antenna, transmitting a respective SC-FDMA signal generated using the cyclic shift delayed version of the reference sequence of M discrete time domain values.