S. M. Alamouti, “A Simple Transmit Diversity Technique for Wireless Communications,” IEEE Journal on Selected Areas in Communications, Vol. 16, No. 8, 1998, pp. 1451-1458.
 Y. A. S. Dama, R. A. Abd-Alhameed, S. M. R. Jones, H. S. O. Migdadi and P. S. Excell, “A New Approach to Quasi-Orthogonal Space-Time Block Coding Applied to Quadruple Mimo Transmit Antennas,” 4th International Conference on Internet Technologies & Applications, September 2011.
 C. B. Papadias and G. J. Foschini, “Capacity-Approaching Space-Time Codes for Systems Employing Four Transmitter Antennas,” IEEE Transactions on Information Theory, Vol. 49, No. 3, 2003, pp. 726-732.
 O. Tirkkonen, A. Boariu and A. Hottinen, “Minimal NonOrthogonality Rate 1 Space-Time Block Code for 3+ Tx Antennas,” IEEE 6th International Symposium on Spread Spectrum Techniques and Applications, 2000, pp. 429-432.
 W. Su and X.-G. Xia, “Signal Constellations for Quasiorthogonal Space-Time Block Codes with Full Diversity,” IEEE Transactions on Information Theory, Vol. 50, No. 10, 2004, pp. 2331-2347.
 N. Sharma and C. B. Papadias, “Improved Quasi-Orthogonal Codes through Constellation Rotation,” IEEE Transactions on Communications, Vol. 51, No. 3, 2003, pp. 332-335. http://dx.doi.org/10.1109/TCOMM.2003.809753
 U. Park, S. Kim, K. Lim and J. Li, “A Novel QO-STBC Scheme with Linear Decoding for Three and Four Transmit Antennas,” IEEE Communications Letters, Vol. 12, No. 12, 2008, pp. 868-870.
 F. Fazel and H. Jafarkhani, “Quasi-Orthogonal Space-Frequency and Space-Time-Frequency Block Codes for MIMO OFDM Channels,” IEEE Transactions on Wireless Communications, Vol. 7, No. 1, 2008, pp. 184-192.
 W. Su, Z. Safar, M. Olfat and K. R. Liu, “Obtaining FullDiversity Space-Frequency Codes from Space-Time Codes via Mapping,” IEEE Transactions on Signal Processing, Vol. 51, 2003, pp. 2905-2916.