[1] R. Thomas Derryberry et al. Nokia Research Center, "Transmit Diversity in 3G CDMA Systems" http://users.ece.utexas.edu/~jandrews/ee381k/EE381KTA/td_cdma.pdf
[2] Texas Instruments: "Open loop downlink transmit diversity for TDD: STTD for TDD", 1999 http://www.3gpp.org/ftp/tsg_ran/wg1_rl1/TSGR1_05/Docs/Pdf/r1-99572.pdf