Abstract
Unitary space-time codes have been used in differential space-time modulation, when neither the transmitter nor the receiver of a multiple antenna system knows the channel state information in Rayleigh fading channels. Among the codes in literature, unitary orthogonal space-time codes, constructed from Alamouti's scheme, have the advantage of fast maximum likelihood (ML) decoding but they require signal constellations to be phase-shift keying (PSK). In this paper, unitary space-time codes are constructed from Alamouti's scheme with amplitude/phase-shift keying (APSK) constellations. We show that the unitary space-time codes from Alamouti's scheme with APSK signals have larger diversity products than those with PSK signals while the complexity of their ML decoding algorithm is comparable. Our newly proposed 4 b/s/Hz code has about 2 dB gain over the same rate code with PSK signals at bit-error rate (BER) of 10~3 with one receive antenna. We also propose a noncoherent scheme of rate 5 b/s/Hz, which has the same BER performance as the 4 b/s/Hz unitary orthogonal space-time code in DSTM while having comparable decoding complexity.
Original language | English |
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Pages (from-to) | 2374-2384 |
Number of pages | 11 |
Journal | IEEE Transactions on Wireless Communications |
Volume | 3 |
Issue number | 6 |
DOIs | |
Publication status | Published - Nov 2004 |
Externally published | Yes |
Keywords
- Alamouti's scheme
- Amplitude/phase shift keying (APSK) signals
- Differential space-time modulation (DSTM)
- Fast maximum-likelihood (ML) decoding algorithm
- Orthogonal space-time codes
- Unitary space-time codes