We present a new space time transmit diversity (STTD) scheme for M/spl ges/4 transmit antennas and one receive antenna. The new diversity scheme belongs to the open loop class and consists of an extension to the work presented by Alamouti (1998) and by Tarokh et al. (1998, 1999). Another hybrid scheme that combines open and close loop classes is also presented. The coding rate of the new scheme is one and in spite of the presence of intersymbol interference it may achieve the full diversity after applying a multi-dimensional orthonormal rotation to the original constellation. For each coding scheme every block with 8 received symbols is detected using a maximum likelihood decoding algorithm to get the estimated maximum likelihood sequence. Q-QAM modulations are analysed.
[1]
A. Robert Calderbank,et al.
Space-Time block codes from orthogonal designs
,
1999,
IEEE Trans. Inf. Theory.
[2]
J.E. Mazo,et al.
Digital communications
,
1985,
Proceedings of the IEEE.
[3]
Américo Correia,et al.
Space Time Diversity for the Downlink of WCDMA
,
2001
.
[4]
A. Robert Calderbank,et al.
Space-Time Codes for High Data Rate Wireless Communications : Performance criterion and Code Construction
,
1998,
IEEE Trans. Inf. Theory.
[5]
Mohamed Oussama Damen,et al.
Lattice code decoder for space-time codes
,
2000,
IEEE Communications Letters.