Abstract
Based on the normalized diversity product criterion of space-time code designs, we present two optimal 2/spl times/2 diagonal algebraic space-time block codes based on field extensions. We then present an n/spl times/n diagonal space-time code design method directly from 2n real integers based on extended complex lattices. We also present a non-tight upper bound for normalized diversity products of 2/spl times/2 diagonal space-time block codes with QAM information symbols from general 2/spl times/2 complex-valued matrices. We finally use the optimal 2/spl times/2 algebraic diagonal space-time codes to construct two 2/spl times/2 full rate space-time block codes and find that both of them have better normalized diversity products than the Golden code does.
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