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Rate-diversity tradeoff of space-time codes with fixed alphabet and optimal constructions for PSK modulation

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2 Author(s)
Hsiao-feng Lu ; Dept. of Electr. Eng.-Syst., Univ. of Southern California, Los Angeles, CA, USA ; P. V. Kumar

We show that for any (Q×M) space-time code S having a fixed, finite signal constellation, there is a tradeoff between the transmission rate R and the transmit diversity gain ν achieved by the code. The tradeoff is characterized by R≤Q-ν+1, where Q is the number of transmit antennas. When either binary phase-shift keying (BPSK) or quaternary phase-shift keying (QPSK) is used as the signal constellation, a systematic construction is presented to achieve the maximum possible rate for every possible value of transmit diversity gain.

Published in:

IEEE Transactions on Information Theory  (Volume:49 ,  Issue: 10 )