J4 ›› 2012, Vol. 39 ›› Issue (4): 161-166.doi: 10.3969/j.issn.1001-2400.2012.04.029

• Original Articles • Previous Articles     Next Articles

Improved extending orthogonal space-time block coding

TIAN Xinji1;NI Shuiping1;SONG Cheng1;ZHAO Wei2   

  1. (1. School of Computer Sci. and Tech., Henan Polytechnic Univ., Jiaozuo  454000, China;
    2. School of Info. and Commun. Eng., Beijing Univ. of Posts and Telecommunications, Beijing  100876, China)
  • Received:2011-10-17 Online:2012-08-20 Published:2012-10-08
  • Contact: TIAN Xinji E-mail:tianxinji.world@yahoo.com.cn

Abstract:

The extending orthogonal space-time block code is constituted by the identical orthogonal space-time block code (OSTBC). However, the channel fading coefficient of each branch of each OSTBC is not taken into consideration, and the performance of the extending orthogonal space-time block code can be improved further. For this problem, an improved extending orthogonal space-time block code is proposed, in which a proper rotation is set at each signal of branches of some OSTBCs. Since the rotation angles are designed to maximize the effective channel gain, the effective channel gain is increased and the performance is improved. Analysis and simulation show that the system performance is improved, and that the computational complexity is also greatly reduced with only a few bits increase in feedback information.

Key words: space-time block coding, channel gain, feedback, computational complexity