Abstract
Constructions of space-time codes having amplitude-modulated phase-shift keying (AM-PSK) constellations are presented in this paper. The first construction, termed p-radii construction, is obtained by extending Hammons' dyadic dual-radii construction to the cases when the size of the constellation is a power of a prime p, p /spl ges/ 2. The resultant code is optimal with respect to the rate-diversity tradeoff and has an AM-PSK constellation with signal points distributed over p- concentric circles in the complex plane, i.e., there are p radii. Also contained in this paper is the identification of rich classes of nontrivial subset-subcodes of the newly constructed space-time codes and it is shown that these subset-subcodes are again, all optimal. Finally, a new generalization of the super-unified construction by Hammons is presented. It is shown that codes obtained from several previously known constructions are subset-subcodes of the one derived from this generalized construction.
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