Abstract
Unitary orthogonal space-time codes, constructed from Alamouti's scheme, has the advan- tage of its fast maximum-likelihood (ML) decoding but it requires signal constellations to be phase shift keying (PSK). In this paper, unitary space-time codes are constructed from Alamouti's scheme with am- plitude/phase shift keying (APSK) signal constella- tions. We show that the unitary space-time codes from Alamouti's scheme with APSK signals have bet- ter diversity products than those with PSK signals. Our proposed rate 4 bits/s/Hz code has about 2 dB gain over the one of the same rate but with PSK sig- nals at bit error rate (BER) of loT3 with one receive antenna. Additionally, our proposed codes have fast ML decoding algorithm, whose complexity is compa- rable to that of unitary orthogonal space-time codes.
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