Abstract:

For supporting large number of transmit antennas in macro diversity transmissions, a highdimensionfullrate (HDFR) quasiorthogonal spacetime block code (QOSTBC) is proposed. The new code operates at full rate, and the maximum likelihood decoding complexity is controllable. The equivalent channel matrix of this code is analyzed. It is concluded that the eigenvectors are constant and independent from the real channel realization. Furthermore, a new preprocessing transmission strategy with singlesymbol linear decoding complexity is given by exploiting the revealed characteristic of HDFR QOSTBC. Simulation shows that the proposed strategy is of more advantage for macro diversity comparing with minimum decoding complexity code and cyclic delay diversity.

Key words: macro diversity, space time block code, constant eigenvectors