Lori Dalton
Dept. of Electrial Engineering
Texas A&M University

A Four Transmit Antenna Orthogonal Space-Time Block Code with Full Diversity and Rate
Sept 26, Tursday. Time: 11:00a-12:00p, Place: 342 Zach

Abstract:

The Alamouti code, remarkable for having an elegant linear maximum likelihood (ML) detector, has become a paradigm in space-time block coding (STBC). In addition to its wonderfully simple receiver, this two transmit antenna code has full rate and full diversity. Orthogonal designs generalize the Alamouti code for more transmit antennas, while maintaining the properties of full diversity and linear ML receiver processing. However, it has been shown from the Hurwitz-Radon theorem that complex linear processing orthogonal designs can not achieve full rate and full diversity simultaneously, except in the two transmit antenna case. But it is easy to interpret the above result on orthogonal designs incorrectly. In this talk, using constellation phase rotations we show that full rate and full diversity complex orthogonal codes may exist with more than two transmit antennas for specific symbol constellation sets, though the general code will not achieve full diversity for all symbol constellations. As an example, we present a simple four transmit antenna orthogonal code and constellation pair with full diversity and full rate.